CN110118401A - The indirect-evaporation cooling device of enclosed pre-cooling - Google Patents

Abstract

The invention discloses a closed-type precooling indirect evaporative cooling device. A first exhaust fan and a spray device are arranged in the cabinet, a water tank is arranged under the packing, and a first surface cooler is arranged between the packing and the water tank. , the first outlet pipe of the water tank is connected to the primary side of the plate heat exchanger, its outlet pipe is connected to the spray device, the secondary side of the plate heat exchanger is connected to the inlet of the first surface cooler, and its outlet pipe is connected to the plate heat exchanger or the air outlet side of the first surface cooler is provided with a closed coil, the outlet pipe of the closed coil is connected to the inlet of the first surface cooler, and the outlet pipe is connected to the closed coil The inlet and the outlet pipe of the water tank are connected to the sprinkler. The invention has a reasonable structure, the two-stage precooling surface coolers of the indirect evaporative water chiller can realize closed operation, avoid safety hazards caused by the open water system, improve the safety of winter use, make full use of outdoor low-temperature air, and save energy Save water and reduce the invalid heat loss of the plate heat exchanger.

Description

Closed precooling indirect evaporative cooling device

technical field

The invention belongs to air treatment equipment in the field of heating, ventilating and air conditioning, in particular to a closed precooling indirect evaporative cooling device.

Background technique

Due to the direct contact with the outdoor air, the open air-conditioning cold water system has certain problems in the water quality of the air-conditioning system. For example, suspended matter in the outdoor air enters the system and causes blockage of the heat exchange equipment. Calcium and magnesium ions precipitate out to form precipitates, causing the blockage of the water pipes of the air conditioning system and the pipes in the heat exchange equipment, which affects the heat exchange efficiency. In addition, the oxygen corrosion in the system causes the corrosion of the pipes to form iron oxides, which also causes the pipes Or blockage of heat exchange equipment. In order to solve the above existing problems, the above problems can be basically solved by adding plate heat exchanger units in the air conditioning system.

The indirect evaporative water chiller uses the surface heat exchanger to pre-cool the outdoor air to reduce the dry and wet bulb temperature of the fresh air. The water intake of the surface heat exchanger is generally the cold water taken by the indirect evaporative water chiller and the return water of the air conditioning system user. Generally, if The cold water produced by the indirect evaporative water chiller is used to pre-cool the outdoor air, and the temperature drop of the outdoor air is relatively large. However, since the open cold water produced by the indirect evaporative water chiller directly enters the surface heat exchanger for heat exchange, the surface heat exchanger's Heat coils are prone to clogging, which reduces the heat transfer efficiency of surface heat exchangers in summer, and freezes the heat exchange coils more easily in winter.

Contents of the invention

The object of the present invention is to provide a closed precooling indirect evaporative cooling device, which has a reasonable structure, and the two-stage precooling surface coolers of the indirect evaporative chiller can realize closed operation, which can avoid the problems caused by the open water system. To avoid potential safety hazards, improve the safety of winter use, make full use of outdoor low-temperature air, save energy and water, and reduce the ineffective heat loss of plate heat exchangers.

The purpose of the present invention is achieved as follows: a closed precooling indirect evaporative cooling device, a first exhaust fan and a spray device are arranged above the filler in the cabinet, a water tank is arranged below the filler, and a water tank is arranged between the filler and the filler. The first surface cooler is installed on the first air inlet between the water tanks. The first outlet pipe of the water tank is connected to the inlet of the primary side of the plate heat exchanger through the first circulating pump, and the outlet pipe is connected to the spray device. The outlet pipe on the secondary side of the heat exchanger is connected to the inlet of the first surface cooler through the second circulation pump and the user, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger; or at the outlet of the first surface cooler A closed coil is installed on the air side, and the outlet pipe of the closed coil is connected to the inlet of the first surface cooler through the second circulation pump and the user, and its outlet pipe is connected to the inlet of the closed coil, and the outlet pipe of the water tank passes through The first circulating pump is connected with the spraying device.

In the present invention, through the closed operation of the user side-loaded cooling medium, the two-stage pre-cooling surface coolers of the indirect evaporative water chiller can realize closed operation, avoiding the potential safety hazards caused by the open water system; at the same time, the indirect evaporative water chiller The pre-cooling surface cooler precools the outdoor fresh air through the cooling medium, which can be water or antifreeze; by adding the second exhaust fan and dry cooling surface cooler, when the indirect evaporative chiller is running in winter, the user side The circulation system will not freeze, and by closing the spray water system of the indirect evaporative chiller, the annual water consumption is reduced; the cold water produced by the indirect evaporative chiller is used in series for the condenser of the air conditioner and the mechanical refrigeration unit, and the chilled water While the cooling capacity is fully released, the air conditioner is safer.

advantage:

1. The surface cooler of the indirect evaporative water chiller is closed to pre-cool the outdoor fresh air, and the coil of the surface cooler will not be blocked, which has high safety;

2. The cooling medium in the secondary side circulation of the plate heat exchanger is water or antifreeze, which improves the safety of winter use;

3. Increase the natural cooling surface cooler and the second exhaust fan in winter, make full use of the outdoor low-temperature air, save energy and water;

4. Through the switching of air valve and water valve, the year-round operation of the indirect evaporative chiller is realized;

5. Increase the mechanical refrigeration unit, use the cold water of the indirect evaporative chiller as the cooling water of the mechanical refrigeration unit, the user's cold water is further cooled by the mechanical refrigeration unit, and the safety of the air conditioner is improved;

6. The closed coil can be used to realize the closed operation of cold water on the user side, which reduces the ineffective heat loss of the plate heat exchanger.

The invention has a reasonable structure, and the two-stage precooling surface coolers of the indirect evaporative water chiller can realize closed operation, avoiding the safety hazards caused by the open water system, improving the safety of winter use, and making full use of outdoor low-temperature air , saving energy and water, reducing the invalid heat loss of the plate heat exchanger.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings. Fig. 1 is a schematic structural view of embodiment 1 of the present invention, Fig. 2 is a schematic structural view of embodiment 2 of the present invention, Fig. 3 is a schematic structural view of embodiment 3 of the present invention, and Fig. 4 is a schematic structural view of the present invention Embodiment 4 is a schematic structural diagram, FIG. 5 is a structural schematic diagram of Embodiment 5 of the present invention, FIG. 6 is a structural schematic diagram of Embodiment 6 of the present invention, FIG. 7 is a structural schematic diagram of Embodiment 7 of the present invention, and FIG. 8 is a schematic structural diagram of Embodiment 8 of the present invention. Figure 9 is a schematic structural view of Embodiment 9 of the present invention, Figure 10 is a schematic structural view of Embodiment 10 of the present invention, Figure 11 is a schematic structural view of Embodiment 11 of the present invention, Figure 12 is a schematic structural view of Embodiment 12 of the present invention, and Figure 13 is an implementation of the present invention Example 13 structural schematic diagram, Figure 14 is a structural schematic diagram of Embodiment 14 of the present invention, Figure 15 is a structural schematic diagram of Embodiment 15 of the present invention, Figure 16 is a structural schematic diagram of Embodiment 16 of the present invention, Figure 17 is a structural schematic diagram of Embodiment 17 of the present invention, Fig. 18 is a schematic structural diagram of Embodiment 18 of the present invention, FIG. 19 is a schematic structural diagram of Embodiment 19 of the present invention, FIG. 20 is a schematic structural diagram of Embodiment 20 of the present invention, FIG. 21 is a schematic structural diagram of Embodiment 21 of the present invention, and FIG. 22 is an embodiment of the present invention 22 Structural schematic diagram, Figure 23 is a structural schematic diagram of Embodiment 23 of the present invention, Figure 24 is a structural schematic diagram of Embodiment 24 of the present invention, Figure 25 is a schematic structural diagram of Embodiment 25 of the present invention, Figure 26 is a schematic structural diagram of Embodiment 26 of the present invention, Figure 27 It is a schematic structural diagram of Embodiment 27 of the present invention, and FIG. 28 is a schematic structural diagram of Embodiment 28 of the present invention.

Detailed ways

A closed precooling indirect evaporative cooling device, as shown in Figure 1 and Figure 23, a first exhaust fan 3 and a spray device 4 are arranged above the packing 2 in the cabinet 1, and a Water tank 5, the first air inlet 6 is installed between the filler 2 and the water tank 5, and the first surface cooler 7 is installed on it. The first outlet pipe of the water tank 5 is connected to the primary side of the plate heat exchanger 9 through the first circulation pump 8 The outlet pipe is connected to the spray device 4, the outlet pipe on the secondary side of the plate heat exchanger 9 is connected to the inlet of the first surface cooler 7 through the second circulation pump 10 and the user 11, and its outlet pipe is connected to the plate heat exchanger 9. The inlet of the secondary side of the heat exchanger 9; or a closed coil 37 is arranged on the air outlet side of the first surface cooler 7, and the outlet pipe of the closed coil 37 is connected to the second circulating pump 10 and the user 11 The inlet of a surface cooler 7 , its outlet pipe is connected with the inlet of the closed coil 37 , and the outlet pipe of the water tank 5 is connected with the spraying device 4 through the first circulation pump 8 . The indirect evaporative cooling device includes a first air inlet 6, a first surface cooler 7, a water tank 5, a filler material 2 and a first exhaust fan 3, and the cold water in the water tank 5 enters the primary side of the plate heat exchanger 9 through the first circulating pump 8, The return water on the primary side of the plate heat exchanger 9 is sprayed and cooled by the filler 2, the liquid outlet pipe on the secondary side of the plate heat exchanger 9 is connected to the air conditioner user 11 through the second circulating pump 10, and the liquid outlet pipe of the user 11 is connected to the first The inlet of the surface cooler 7 and the outlet of the first surface cooler 7 are connected to the liquid inlet of the secondary side of the plate heat exchanger 9, wherein the cooling medium circulating on the primary side of the plate heat exchanger 9 is cold water, and the cold water passes through the packing 2 Cooling, the cooling medium circulating in the secondary side of the plate heat exchanger 9 can be water or antifreeze (such as ethylene glycol solution), and the antifreeze precools the air entering the packing 2 through the first surface cooler 7, and the first The cold-carrying medium of the surface cooler 7 is the closed antifreeze on the secondary side of the plate heat exchanger 9, which avoids the potential safety hazard of blockage caused by the open cold water to the coil of the first surface cooler. In order to realize the closed-type operation of the indirect evaporative cooling water supply device, a closed-type coil 37 is arranged on the air outlet side of the first surface cooler 7, and the air whose temperature is lowered by the first surface cooler 7 passes through the closed-type coil 37 to cool the load. Cold medium, the low-temperature outlet liquid of the closed coil 37 is used for cooling by the air conditioner user 11 through the second circulating pump 10, and the outlet liquid of the user 11 is pre-cooled by the first surface cooler 7, and the outlet of the first surface cooler 7 The liquid returns to the liquid return port of the closed coil 37 to cool and cool down. The closed coil 37 is arranged under the filler 2. The cooling medium in the closed coil 37 is cooled by the spray water and low-temperature air outside the coil to avoid The potential safety hazards of open cold water are eliminated, and the waste of cooling capacity caused by the use of plate heat exchanger 9 in conventional closed systems is also avoided.

As shown in Figure 2, a second surface cooler 12 is arranged on the air outlet side of the first surface cooler 7, and a bypass is arranged on the pipeline connecting the second circulation pump 10 to the user 11, and the bypass is connected to the second surface The inlet of cooler 12, its outlet pipe is connected on the inlet pipe of the first surface cooler 7. A second surface cooler 12 is provided on the air outlet side of the first surface cooler 7, and the cold water in the water tank 5 passes through the first circulating pump 8 and enters the primary side of the plate heat exchanger 9, and the return water on the primary side of the plate heat exchanger 9 The temperature is lowered by spraying the filler 2, and part of the liquid outlet pipe on the secondary side of the plate heat exchanger 9 enters the second surface cooler 12 through the second circulation pump 10, and part of it enters the air conditioner user for cooling, and the liquid outlet of the user 11 and the second surface cooler 12 after the liquid outlet is mixed, enter the first surface cooler 7 to pre-cool the outdoor air for the first time, the outlet of the first surface cooler 7 is connected to the liquid inlet of the secondary side of the plate heat exchanger 9, the first surface The cold-carrying medium in the cooler 7 and the second surface cooler 12 is the antifreeze liquid on the secondary side of the plate heat exchanger 9, and the first surface cooler 7 and the second surface cooler 12 are all closed-type operations, avoiding open There is a safety hazard that the type cold water will block the heat exchange coil.

As shown in FIG. 3 , the outlet pipe of the second surface cooler 12 is connected with the outlet pipe of the first surface cooler 7 . The cold water in the water tank 5 passes through the first circulating pump 8 and enters the primary side of the plate heat exchanger 9. The return water on the primary side of the plate heat Part of the secondary circulation pump 10 enters the second surface cooler 12, and part of it enters the air conditioner user 11 for refrigeration. The output liquid of the second surface cooler 12 returns to the secondary side of the plate heat exchanger 9, and the first surface cooler 7 and the second surface cooler 12 are both closed to avoid blockage of the heat exchange coil by the open cold water security risks.

As shown in Figure 4, a bypass is provided on the pipeline connecting the primary side inlet of the first circulating pump 8 to the plate heat exchanger 9, and the bypass is connected to the inlet of the second surface cooler 12, and its outlet pipe is connected to the spraying device 4. The second surface cooler 12 is arranged on the air outlet side of the first surface cooler 7, and the cold water of the water tank 5 passes through the first circulation pump 8, a part enters the second surface cooler 12, and the other part enters the primary side of the plate heat exchanger 9, The return water of the primary side of the plate heat exchanger 9 and the outlet water of the second surface cooler 12 are sprayed and cooled through the filler 2, and the outlet pipe of the secondary side of the plate heat exchanger 9 is connected to the air conditioner user through the second circulation pump 10, and the user’s The outlet pipe is connected to the inlet of the first surface cooler 7, the outlet of the first surface cooler 7 is connected to the liquid inlet of the secondary side of the plate heat exchanger 9, and the cooling medium enters the packing through the first surface cooler 7 2 is pre-cooled for the first time, and part of the cold water in the water tank 5 is pre-cooled for the second time by the second surface cooler 12 on the air entering the filler 2. After the two pre-coolings, the dry and wet bulb temperature of the air is lower. The temperature of the cold water produced is lower.

As shown in Figure 5, an air box is arranged between the air outlet side of the first surface cooler 7 and the chassis 1, and a second exhaust fan 16 is arranged on the air outlet of the air box, which is located in the air box, and is located on the first surface cooler 7. An air chamber is connected between the air outlet side and the air inlet side of the second surface cooler 12, a second air outlet 13 and a third air outlet 14 are respectively arranged at the bottom and top of the air chamber, and a fourth air outlet is obliquely arranged in the air chamber 15. The outlet pipe of the user 11 is connected to the inlet of the second surface cooler 12, and its outlet pipe is connected to the inlet of the first surface cooler 7. A second surface cooler 12 is arranged on the air outlet side of the first surface cooler 7 , and a dry cooling in winter is realized by setting an air valve and a second exhaust fan 16 . Operating condition 1: the second air outlet 13, the third air outlet 14 and the second exhaust fan 16 are closed, the fourth air outlet 15 is closed, the outdoor air is cooled step by step through the first surface cooler 7 and the second surface cooler 12, and passed through the user The cold-carrying medium after the heat exchange first enters the second surface cooler 12, the outlet liquid of the second surface cooler 12 enters the first surface cooler 7, and the outlet liquid of the first surface cooler 7 returns to the plate heat exchanger 92 On the secondary side, the temperature of the air that has been cooled step by step is lower. In summer, the outlet water temperature of the water tank 5 can be lower; the second operating condition: the second air outlet 13 and the third air outlet 14 and the first exhaust fan 3 and the second air outlet. Both rows of fans 16 are turned on, and the fourth air outlet 15 is closed. The cooling medium after heat exchange by the user 11 first enters the second surface cooler 12, and the outdoor low-temperature air entering through the second air outlet 13 is cooled and passes through the second surface cooler. 12 The air after the heat exchange is discharged by the first exhaust fan 3, and the liquid output from the second surface cooler 12 further enters the first surface cooler 7, and the outdoor low-temperature air entering through the first air inlet 6 is further cooled, and passes through the first surface cooler. The air after the heat exchange of the cooler 7 is discharged by the second exhaust fan 16, and the spray water system on the primary side of the plate heat exchanger 9 is stopped, and only low-temperature air is used for dry cooling to fully save water.

As shown in Figure 6, a bypass is set on the pipeline between the second circulating pump 10 and the inlet of the user 11, the bypass is connected to the inlet of the second surface cooler 12, and the outlet pipe of the user 11 is connected to the first surface cooler. The inlet of device 7, the outlet pipe of the second surface cooler 12 is connected with the inlet pipe of the first surface cooler 7. By switching different air inlets, simultaneous cooling in winter and summer of the first surface cooler 7 and the second surface cooler 12 is realized. Operating condition 1: the second air outlet 13 and the third air outlet 14 are closed, the fourth air outlet 15 is opened, the outdoor air enters through the first air inlet 6, and passes through the two-stage preheating of the first surface cooler 7 and the second surface cooler 12. Cold water is produced through the filler 2; operating condition two: the second air outlet 13 and the third air outlet 14 are opened, the fourth air outlet 15 is closed, and the outdoor low-temperature air enters through the first air inlet 6 and the second air outlet 13 respectively, and passes through the first air inlet 6 and the second air outlet 13 respectively. One surface cooler 7 and the second surface cooler 12 cool the cooling medium, the air outlet of the first surface cooler 7 is discharged by the second exhaust fan 16 through the third air outlet 14, and the air of the second surface cooler 12 is discharged by the second The tuyere 13 enters and is discharged through the first exhaust fan 3 through the filler 2. The circulation flow of the antifreeze is as follows: a part of the low-temperature cooling medium on the secondary side of the plate heat exchanger 9 passes through the second surface cooler 12, and the second surface cooler The outlet liquid of the cooling medium in 12 is mixed with the higher temperature cooling medium after heat exchange by the user 11, and then enters the first surface cooler 7, and the outlet liquid of the first surface cooler 7 returns to the plate heat exchanger 9 for the second time side.

As shown in Figure 7, a bypass is provided on the pipeline connecting the primary side inlet of the first circulation pump 8 to the plate heat exchanger 9, and the bypass is connected to the inlet of the second surface cooler 12, and its outlet pipe is connected to the spraying device 4. The outlet pipe on the secondary side of the plate heat exchanger 9 is connected to the inlet of the first surface cooler 7 through the second circulating pump 10 and the user 11, and its outlet pipe is connected to the inlet on the secondary side of the plate heat exchanger 9. The second surface cooler 12 is arranged on the air outlet side of the first surface cooler 7. During winter operation, the fourth air outlet 15 is closed, and the outdoor air enters the first surface cooler 7 from the first air inlet 6, and the cooling medium is cooled by the low temperature. Air cooling, the air is discharged from the third air outlet 14 through the second exhaust fan 16, the outdoor air enters the second surface cooler 12 through the second air outlet 13, and the outlet air of the second surface cooler 12 passes through the packing 2 to produce cold water, and the cold water enters The primary side of the plate heat exchanger 9 further cools the cooling medium on the secondary side of the plate heat exchanger 9 .

As shown in Figure 8, a bypass is set on the pipeline connecting the second circulating pump 10 to the inlet of the user 11, and the bypass is connected to the inlet of the second surface cooler 12 through the first valve 17, and the outlet pipe of the user 11 passes through the third The valve 19 is connected to the inlet of the first surface cooler 7, and is connected to the outlet of the second surface cooler 12 through the bypass provided, and a bypass is provided on the outlet pipe of the user 11, and the bypass passes through the second valve 18 is connected on the bypass that the outlet pipe of the second circulating pump 10 after the first valve 17 is set. By setting valves to switch different cooling medium circulation processes in winter and summer, operating condition 1: the second tuyere 13 and the third tuyere 14 are closed, the fourth tuyere 15 is opened, the second valve 18 is closed, the first valve 17, the third valve 19 is turned on, a part of the low-temperature cooling medium on the secondary side of the plate heat exchanger 9 enters the second surface cooler 12 to pre-cool the outdoor air for the second time, and the other part enters the air conditioner user 11 for cooling, and the liquid discharged from the user 11 passes through the second After the three-valve 19 is mixed with the output liquid of the second surface cooler 12, it enters the first surface cooler 7 to pre-cool the outdoor air for the first time, and the output liquid of the first surface cooler 7 returns to the plate heat exchanger 9 for the second time Side cooling cycle; operating condition 2: the second air outlet 13 and the third air outlet 14 are opened, the fourth air outlet 15 is closed, the first valve 17 and the third valve 19 are closed, the second valve 18 is opened, and the plate heat exchanger 9 is secondary The outlet liquid from the side enters the air conditioner user 11 for cooling through the second circulation pump 10, the outlet liquid from the user 11 first enters the second surface cooler 12, and is cooled by the outdoor low-temperature air, and then the outlet liquid from the second surface cooler 12 enters the first The surface cooler 7 is cooled by the low-temperature outdoor air for the second time, and the outlet liquid temperature of the first surface cooler 7 is lowered, and returns to the secondary side of the plate heat exchanger 9 for cooling by air conditioners.

As shown in Figure 9, a bypass is provided on the pipeline connecting the second circulating pump 10 to the inlet of the user 11, and the bypass is connected to the inlet of the second surface cooler 12 through the first valve 17 and the three-way, and the other of the three-way The interface is connected to the outlet pipe of the first surface cooler 7 through the second valve 18 , and the outlet pipe of the user 11 is connected to the inlet of the first surface cooler 7 . By setting valves to switch different cooling medium circulation processes in winter and summer, operating condition 1: the second tuyere 13 and the third tuyere 14 are closed, the fourth tuyere 15 is opened, the second valve 18 is closed, the first valve 17, the third valve 19 is turned on, a part of the low-temperature cooling medium on the secondary side of the plate heat exchanger 9 enters the second surface cooler 12 to pre-cool the outdoor air for the second time, and the other part enters the air conditioner user 11 for cooling, and the liquid output from the user 11 enters the second surface cooler 12 A surface cooler 7 pre-cools the outdoor air for the first time, and the output liquid of the first surface cooler 7 and the output liquid of the second surface cooler 12 are all returned to the secondary side cooling cycle of the plate heat exchanger 9; Situation 2: The second tuyere 13 and the third tuyere 14 are opened, the fourth tuyere 15 is closed, the first valve 17 and the third valve 19 are closed, the second valve 18 is opened, and the output liquid from the secondary side of the plate heat exchanger 9 passes through the second The secondary circulation pump 10 all enters the air conditioner user 11 for cooling. The liquid output from the user 11 first enters the first surface cooler 7 and is cooled by the outdoor low-temperature air. The liquid output from the first surface cooler 7 enters the second surface cooler 12 and is cooled The outdoor low-temperature air is cooled for the second time, and the outlet liquid temperature of the second surface cooler 12 is lowered, and returns to the secondary side of the plate heat exchanger 9 for cooling by the air conditioner user.

As shown in Figure 10, an air inlet box is arranged between the air outlet side of the second surface cooler 12 and the air inlet of the chassis 1, and the sixth and seventh air outlets 21 and 22 are respectively arranged on the top and bottom of the air inlet box. The air inlet of 1 is provided with the fifth air outlet 20. A fifth air outlet and a sixth air outlet are arranged on the air outlet side of the second surface cooler. Operating condition 1: the first exhaust fan 3 is closed, the fourth air outlet 15, the fifth air outlet 20 and the seventh air outlet 22 are all closed, the second air outlet 13, the third air outlet 14 and the sixth air outlet 21 are all opened, and the outdoor air is first The second air outlet 13 enters the second surface cooler 12 to cool the cooling medium after heat exchange by the user, the outdoor air is discharged from the sixth air outlet 21 through the second exhaust fan 16, and the outdoor air passes through the first air inlet 6 through the first surface cooler. The device 7 further cools the cooling medium passing through the second surface cooler 12, and the outdoor air is discharged from the third air outlet 14 through the second exhaust fan 16. After two-stage cooling by the first surface cooler 7 and the second surface cooler 12, the temperature The reduced cooling medium is used for the cooling of the user 11. By setting the fifth air outlet 20 and the sixth air outlet 21, the air does not pass through the filler 2 during winter operation, which reduces the energy consumption of the exhaust fan during winter operation; operating condition 2: The second air outlet 13, the third air outlet 14 and the second exhaust fan 16 are closed, the sixth air outlet 21 is also closed, the fourth air outlet 15 is opened, and the outdoor air is cooled step by step through the first surface cooler 7 and the second surface cooler 12; Operating condition three: only the fifth air outlet 20 and the seventh air outlet 22 are opened, the first exhaust fan 3 is turned on, and the outdoor air passes through the filler 2 to produce cold water.

As shown in Figure 11, on the pipeline that the second circulation pump 10 is connected user 11 inlets, be provided with bypass, bypass is connected with the inlet of the second surface cooler 12, and the outlet pipe of user 11 is connected with the first surface cooler 7 The inlet and the outlet pipe of the second surface cooler 12 are connected with the outlet pipe of the user 11 . By switching different air inlets, simultaneous cooling in winter and summer of the first surface cooler 7 and the second surface cooler 12 is realized. Operating condition 1: the second air outlet 13 and the third air outlet 14 are closed, the fourth air outlet 15 is opened, the sixth air outlet 21 and the seventh air outlet 22 are closed, the fifth air outlet 20 is opened, and the outdoor air enters through the first air inlet 6. Through the two-stage precooling of the first surface cooler 7 and the second surface cooler 12, cold water is produced through the filler 2; operating condition 2: only the fifth air outlet 20 and the seventh air outlet 22 are opened, and the first exhaust fan 3 is turned on , the outdoor air is cooled by packing 2; operating condition three: only the first air inlet 6 and the third air outlet 14 are opened, the second exhaust fan 16 is turned on, and the outdoor low-temperature air passes through the first surface cooler 7 to cool the load on the user side cold medium.

As shown in Figure 12, the outlet pipe of the user 11 is connected to the inlet of the first surface cooler 7, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 9, and the first circulating pump 8 is connected to the plate heat exchanger 9 once A bypass is arranged on the pipeline of the side inlet, and the bypass is connected to the inlet of the second surface cooler 12 , and its outlet pipe is connected to the spray device 4 . Operating condition 1: the second, third, sixth, and seventh air outlets 13, 14, 21, and 22 are closed, the fourth and fifth air outlets 15, 20 are opened, the first exhaust fan 3 is opened, and the second exhaust fan 16 is closed , after the outdoor air is pre-cooled by the first surface cooler 7 and the second surface cooler 12, cold water is produced through the filler 2; operating condition 2: only the fifth air outlet 20 and the seventh air outlet 22 are opened, and the first exhaust fan 3 is turned on, the outdoor air passes through the filler 2 to produce cold water, which reduces the operating energy consumption of the first exhaust fan 3; operating condition 3: the third air outlet 14 is opened, other air outlets are closed, and the outdoor low-temperature air passes through the first air inlet 6 in the The first surface cooler 7 cools the cooling medium required by the user, and the air is discharged through the second exhaust fan 16. At this time, the spray water system of the packing 2 is closed.

As shown in Figure 13, a bypass is provided on the pipeline connecting the second circulating pump 10 to the inlet of the user 11, and the bypass is connected to the inlet of the second surface cooler 12, and its outlet pipe is connected to the secondary side of the plate heat exchanger 9 The inlet of user 11, the outlet pipe of user 11 is connected with the inlet of first surface cooler 7, and its outlet pipe is connected with the outlet pipe of second surface cooler 12. The circulation flow of the antifreeze is as follows: part of the low-temperature cooling medium on the secondary side of the plate heat exchanger 9 passes through the second surface cooler 12, and the relatively high temperature cooling medium enters the first surface cooling unit 7 after heat exchange by the user. The outdoor air is cooled in two stages by the cooling medium in the first surface cooler 7 and the second surface cooler 12, and the output liquid from the first surface cooler 7 and the second surface cooler 12 returns to the plate heat exchanger 92 Secondary side.

As shown in Figure 14, the outlet pipe of the user 11 is connected to the inlet of the first surface cooler 7, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 9, and the second outlet pipe of the water tank 5 passes through the third circulation pump 23 is connected to the inlet of the second surface cooler 12, the outlet pipe is connected to the spray device 4 through the set three-way and the fourth valve 24, and the other interface of the three-way is connected to the water tank 5 through the fifth valve 25, plate type The outlet pipe on the primary side of the heat exchanger 9 is connected to the spray device 4 through the set three-way and the sixth valve 26, and the other interface of the three-way is connected to the water tank 5 through the seventh valve 27, and a partition is arranged in the water tank 5. Plate 28 separates the lower part of water tank 5, and the water level of its upper part is connected. The first and second outlet pipes of water tank 5 are respectively connected on the water outlet of water tank 5 separated by dividing plate 28. By setting air valves at the air inlets of the first surface cooler 7 and the second surface cooler 12, a water valve is set on the circulation pipeline to switch between different operating modes in winter and summer. During summer operation, the second air outlet 13 and the third air outlet 14 are closed, and the fourth air outlet 15 is opened. The dry and hot outdoor air first passes through the first surface cooler 7, is pre-cooled by the cooling medium that passes through the user’s heat exchange, and then passes through the second air cooler. The surface cooler 12 is pre-cooled by the low-temperature cold water of the water tank 5, and a third circulation pump 23 is provided at the water inlet of the second surface cooler 12, and the cooling medium whose heat exchange temperature rises through the first surface cooler 7 is returned to To the secondary side of the plate heat exchanger 9, the cold water whose heat exchange temperature has been raised by the second surface cooler 12 returns to the filler 2 to spray and cool down, and the return water from the primary side of the plate heat exchanger 9 returns to the filler 2 to spray and cool down. At this time, on the cooling medium circulation pipeline, the fourth valve 24 and the sixth valve 26 are opened, the fifth valve 25 and the seventh valve 27 are closed; The four air outlets 15 are closed, the second exhaust fan 16 is turned on, and the cooling medium that has been heated by the user's heat exchange temperature passes through the first surface cooler 7, is first cooled by the outdoor low-temperature air, and then returns to the secondary side of the plate heat exchanger 9, The water tank 5 is divided into left and right parts. The cold water circulation process on the primary side of the plate heat exchanger 9 is as follows: the return water on the primary side of the plate heat exchanger 9 has the highest temperature, enters the right side of the water tank 5 through the seventh valve 27, and passes through the third circulating pump. 23 enters the second surface cooler 12 and is cooled by outdoor low-temperature air, and the cold water with reduced temperature enters the left side of the water tank 5 through the valve 25, enters the primary side of the plate heat exchanger 9 through the first circulation pump 8, and uses low-temperature cold water in the plate heat exchanger 9. The primary side cools the cooling medium on the secondary side. At this time, on the water circulation pipeline, the fourth valve 24 and the sixth valve 26 are closed, and the fifth valve 25 and the seventh valve 27 are opened. During winter and summer operation, the flow rate and lift of the third circulation pump 23 are inconsistent, so the third circulation pump 23 is set as a frequency conversion pump, which is convenient for flexible adjustment of the flow rate and lift of the water pump.

As shown in Figure 15, the outlet pipe of the user 11 is connected to the inlet of the first surface cooler 7, its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 9, and the outlet pipe of the first circulation pump 8 is connected through a tee The inlet of the primary side of the plate heat exchanger 9, the other interface pipe of the tee is connected to the inlet of the second surface cooler 12 through the sixth valve 26, and its outlet pipe is connected to the spray device 4 through the fourth valve 24, and the water tank The outlet pipe of 5 is connected to the outlet pipe of the second surface cooler 12 behind the fourth valve 24 through the fifth valve 25, and the outlet pipe of the primary side of the plate heat exchanger 9 is connected with the eighth valve 29 through the set tee Next to the spraying device 4, another interface pipe of the tee is connected to the inlet pipe of the second surface cooler 12 through the seventh valve 27. By setting air valves at the air inlets of the first surface cooler 7 and the second surface cooler 12, a water valve is set on the circulation pipeline to switch between different operating modes in winter and summer. In this switching mode, the first circulation pump 8 can be used in winter and summer to realize the operation of the system. Operating condition 1: the second air outlet 13 and the third air outlet 14 are closed, the fourth air outlet 15 is opened, and the cold water in the water tank 5 passes through the first air outlet. A circulating pump 8, one part enters the second surface cooler 12, and the other part enters the primary side of the plate heat exchanger 9, the outdoor hot and dry air first passes through the first surface cooler 7, and is pre-cooled by the cooling medium that passes through the heat exchange of the user 11 , and then through the second surface cooler 12, pre-cooled by the low-temperature cold water of the water tank 5, and the cold-carrying medium whose heat exchange temperature rises through the first surface cooler 7 returns to the secondary side of the plate heat exchanger 9, and passes through the second surface cooler. The cold water whose heat exchange temperature has risen in the cooler 12 returns to the filler 2 for spray cooling, and the return water on the primary side of the plate heat exchanger 9 returns to the filler 2 for spray cooling. At this time, on the cooling medium circulation pipeline, the fourth valve 24, The sixth valve 26 and the eighth valve 29 are opened, the fifth valve 25 and the seventh valve 27 are closed; operating condition 2: the second air port 13 and the third air port 14 are opened, the fourth air port 15 is closed, and the second exhaust fan 16 is opened , the cooling medium whose heat exchange temperature has been raised by the user 11 passes through the first surface cooler 7, is first cooled by the outdoor low-temperature air, and then returns to the secondary side of the plate heat exchanger 9, and the cold water cycle of the primary side of the plate heat exchanger 9 The process is as follows: the temperature of the outlet water on the primary side of the plate heat exchanger 9 is the highest, and the outlet water on the primary side enters the second surface cooler 12 through the seventh valve 27, and is cooled by the outdoor low-temperature air in the second surface cooler 12, and the cold water with reduced temperature Use the first circulation pump 8 to enter the primary side of the plate heat exchanger 9 through the fifth valve 25, and use low-temperature cold water to cool the secondary-side cooling medium on the primary side of the plate heat exchanger 9. At this time, on the water circulation pipeline, the fourth valve 24 , the sixth valve 26 and the eighth valve 29 are closed, and the fifth valve 25 and the seventh valve 27 are opened.

As shown in Figure 16, an air box is arranged on the air inlet side of the cabinet 1, a first air inlet 6 is arranged on the air box, a first surface cooler 7 is arranged on the first air inlet 6, and the air inlet side of the cabinet 1 is connected to An air inlet box is arranged between the air outlet sides of the first surface cooler 7 , the sixth and seventh air outlets 21 and 22 are respectively arranged at the top and bottom of the air inlet box, and the fifth air outlet 20 is arranged at the air inlet of the chassis 1 . Operating condition 1: the sixth tuyere 21 and the seventh tuyere 22 are closed, the fifth tuyere 20 is opened, the outdoor air is pre-cooled by the first surface cooler 7, and then enters the filling cooling spray water through the fifth tuyere 20; the operating condition Two: The fifth tuyere 20 and the seventh tuyere 22 are opened, the sixth tuyere 21 is closed, and the outdoor air directly enters the packing cooling spray water to produce cold water; operating condition three: the fifth tuyere 20 and the seventh tuyere 22 are closed, the sixth The tuyere 21 is opened, the second exhaust fan 16 is opened, and the outdoor low-temperature air passes through the first surface cooler 7 to cool the cold medium loaded on the user side.

As shown in Figure 17, the outlet pipe on the primary side of the plate heat exchanger 9 is connected to the cooling water inlet of the mechanical refrigeration unit 30, and its outlet pipe is connected to the spray device 4, and the chilled water outlet pipe of the mechanical refrigeration unit 30 passes through the second circulating pump 10 and The user 11 is connected to the inlet of the first surface cooler 7 , and the outlet pipe on the secondary side of the plate heat exchanger 9 is connected to the inlet of the chilled water of the mechanical refrigeration unit 30 . The outlet water on the primary side of the plate heat exchanger 9 is connected to the cooling water inlet of the mechanical refrigeration unit 30 , the outlet water of the cooling water of the mechanical refrigeration unit 30 is sprayed and cooled by the filler 2 , and the outlet of the chilled water side of the mechanical refrigeration unit 30 passes through the second circulation pump 10 It is connected to the inlet of the air conditioner user 11, and the liquid outlet of the user 11 is connected to the inlet of the first surface cooler 7, and the liquid outlet of the first surface cooler 7 is connected to the inlet of the secondary side of the plate heat exchanger 9, and the plate heat exchange The outlet pipe on the secondary side of the device 9 is connected to the chilled water inlet of the mechanical refrigeration unit 30, and the cooling medium circulated between the secondary side of the plate heat exchanger 9 and the chilled water side of the mechanical refrigeration unit 30 is antifreeze. By adding the mechanical refrigeration unit 30 , the safety of the user's air conditioner is more guaranteed.

As shown in Figure 18, the outlet pipe on the primary side of the plate heat exchanger 9 is connected to the cooling water inlet of the mechanical refrigeration unit 30 through the provided tee, and the cooling water outlet pipe of the mechanical refrigeration unit 30 is connected to the spray device 4. The other interface pipe connected to the mechanical refrigeration unit 30 is connected to the cooling water outlet pipe of the mechanical refrigeration unit 30 through the ninth valve 31, the secondary side outlet pipe of the plate heat exchanger 9 is connected to the chilled water inlet of the mechanical refrigeration unit 30, and the chilled water outlet of the mechanical refrigeration unit 30 The pipe is connected to the inlet of the first surface cooler 7 through the set tee, the second circulating pump 10 and the user 11, wherein the other interface of the tee is connected to the secondary side of the plate heat exchanger 9 through the tenth valve 32 outlet pipe. By adjusting the ninth valve 31, a part of the water outlet from the primary side of the plate heat exchanger 9 is used as the cooling water of the mechanical refrigeration unit 30, and the other part returns to the packing 2 for spray cooling, and the cooling water of the mechanical refrigeration unit 30 returns to the packing 2 Spray cooling, by adjusting the tenth valve 32, a part of the secondary side outlet water of the plate heat exchanger 9 enters the chilled water side of the mechanical refrigeration unit 30 for further cooling, and the other cold water is mixed with the chilled water outlet water of the mechanical refrigeration unit 30 For air-conditioning users, in this system flow, the mechanical refrigeration unit 30 is configured to make full use of the indirect evaporative cooling water supply device to produce cold water, and the mechanical refrigeration unit 30 only plays the role of supplementary refrigeration.

As shown in Figure 19, the exhaust pipe of the first exhaust fan 3 is connected to the air inlet of the outdoor heat exchanger 33 of the air-cooled mechanical refrigeration unit, and the refrigerant inlet and outlet pipes of the outdoor heat exchanger 33 are connected to the indoor heat exchanger. Heater 34. The condenser of the air-cooled mechanical refrigeration unit is arranged at the air outlet of the first exhaust fan 3, and the indirect evaporative cooling water supply device is combined with the air-cooled mechanical refrigeration unit. A row of fans 3 are sent to the air-cooled condenser of the air-cooled mechanical refrigeration unit, which improves the energy efficiency of the air-cooled mechanical refrigeration unit.

As shown in Figure 20, the air box with the eighth air inlet 35 and the air outlet is arranged on the top of the first surface cooler 7, the third surface cooler 36 is arranged on the eighth air inlet 35, and the air outlet is arranged on the eighth air inlet 35. Next to the second exhaust fan 16, the outlet pipe of the first surface cooler 7 is connected to the inlet of the third surface cooler 36, and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger 9. Increase the third surface cooler 36, the eighth air inlet is arranged on the air inlet side corresponding to the third surface cooler 36, the second exhaust fan 16 is arranged on the air outlet side of the third surface cooler 36, and the third surface cooler 36 is added The main purpose is: when the indirect evaporative cooling water supply device is running in winter, close the spray water system on the primary side of the plate heat exchanger 9, and only use the outdoor low-temperature air to cool the user through the first surface cooler 7 and the first exhaust fan 3 The high-temperature cooling medium on the liquid outlet side has insufficient cooling capacity, and the third surface cooler 36 and the second exhaust fan 16 are added to assist in cooling. The outlet liquid of the first surface cooler 7 enters the third surface cooler 36 for further cooling. The cooling medium passes through the secondary side of the plate heat exchanger 9 and enters the user for refrigeration.

As shown in Figure 21, a second surface cooler 12 is arranged on the air outlet side of the first surface cooler 7, and its outlet pipe is connected to the outlet pipe of the user 11, and on the connecting pipe between the second circulation pump 10 and the user 11 A bypass is provided, and the bypass is connected to the inlet of the second surface cooler 12 . Increase the third surface cooler 36, the eighth air inlet is arranged on the air inlet side corresponding to the third surface cooler 36, the second exhaust fan 16 is arranged on the air outlet side of the third surface cooler 36, and the third surface cooler 36 is added The main purpose is: when the indirect evaporative cooling water supply device is running in winter, close the spray water system on the primary side of the plate heat exchanger 9, and only use the outdoor low-temperature air to pass through the first surface cooler 7, the second surface cooler 12 and the second surface cooler. A row of fans 3 is used to cool the high-temperature cooling medium on the liquid outlet side of the user. If the cooling capacity is insufficient, the third surface cooler 36 and the second exhaust fan 16 are added to assist in cooling, and the liquid output from the first surface cooler 7 enters the third surface cooler. The device is further cooled, and the low-temperature cooling medium passes through the secondary side of the plate heat exchanger 9 and enters the user for refrigeration.

As shown in Figure 22, a bypass is provided on the pipeline connecting the primary side inlet of the first circulating pump 8 to the plate heat exchanger 9, and the bypass is connected to the inlet of the second surface cooler 12, and its outlet pipe is connected to the spray device 4 , the outlet pipe on the secondary side of the plate heat exchanger 9 is connected to the inlet of the first surface cooler 7 through the second circulation pump 10 and the user 11 . The second surface cooler 12 passes through the open cold water of the water tank 5, and is mainly used for precooling the outdoor air in summer. In winter, the spray water system on the primary side of the plate heat exchanger 9 is closed, and the outdoor low temperature air passes through the first surface The cooler 7 and the third surface cooler 36 cool the cooling medium.

As shown in FIG. 24 , the closed coil 37 is arranged in the water tank 5 at the lower part of the air outlet side of the first surface cooler 7 . The closed coil 37 can be arranged in the water tank 5, and can protect the water in the water tank 5 from freezing. The outlet liquid enters the side near the bottom of the water tank 5 in the closed coil 37, and the liquid outlet side of the closed coil 37 is close to the upper part of the water tank 5, and the temperature of the outlet liquid of the closed coil 37 decreases, and the second circulating pump 10, Used for user 11 cooling.

As shown in Figure 25, the user 11 is a unit provided with a high-temperature surface cooler 39 and a low-temperature surface cooler 40, the outlet pipe of the second circulation pump 10 is connected to the inlet of the user's high-temperature surface cooler 39, and its outlet pipe is connected to the first The inlet of the first surface cooler 7, the outlet pipe of the first surface cooler 7 is connected to the inlet of the secondary side of the plate heat exchanger 9, and the outlet pipe of the user's low-temperature surface cooler 40 is connected to the cooling water inlet of the air-cooled mechanical refrigeration unit 38 , its cooling water outlet pipe is connected to the inlet of the low temperature surface cooler 40. The indirect evaporative cooling water supply device is combined with the air-cooled mechanical refrigeration unit. The user 11 includes a high-temperature surface cooler 39 and a low-temperature surface cooler 40. The high-temperature cooling medium on the secondary side of the plate heat exchanger 9 is used for the high-temperature surface cooler 39 to preheat. Cold air, the low-temperature load-carrying medium produced by the air-cooled mechanical refrigeration unit is used for the low-temperature surface cooler 40 to further cool the air. The indirect evaporative cooling water supply device can meet the user's cooling requirements, and turn off the air-cooled mechanical refrigeration unit to reduce system energy consumption.

As shown in FIG. 26 , the first exhaust fan 3 is connected to the air inlet of the condenser of the air-cooled mechanical refrigeration unit 38 through an exhaust pipe. The indirect evaporative cooling water supply device is combined with the air-cooled mechanical refrigeration unit 38, the exhaust air of the indirect evaporative cooling water supply device leads to the condenser of the air-cooled mechanical refrigeration unit 38, and the user 11 includes a high-temperature surface cooler 39 and a low-temperature surface cooler 40, The high-temperature cooling medium on the secondary side of the plate heat exchanger 9 is used for precooling the air in the high-temperature surface cooler 39, and the low-temperature cooling medium produced by the air-cooled mechanical refrigeration unit 38 is used in the low-temperature surface cooler 40 to further cool the air. The temperature of the air cooled by the second stage is lowered, and it is sent to the air-conditioning area. During part of the year, only the indirect evaporative cooling water supply device can satisfy the user's cooling requirements, and the air-cooled mechanical refrigeration unit 38 is turned off to reduce system energy consumption.

As shown in FIG. 27 , the closed coil 37 is arranged at the lower part of the air outlet side of the first surface cooler 7 and above the water tank 5 . After the outdoor air is cooled by the first surface cooler 7, cold water is produced through the filler 2, and the cold water cools the cooling medium in the closed coil 37 outside the closed coil 37, and the cooling medium in the coil and the cooling water outside the coil Closed heat exchange is realized. The cooled cooling medium is used for cooling by the user, and the liquid discharged from the user enters the first surface cooler 7 to cool the air. According to the needs, when the temperature of the liquid discharged from the closed coil 37 is relatively high, it cannot meet the requirements of the user. When refrigeration is required, the liquid output from the coil can be further cooled by the mechanical refrigeration unit, and the temperature is further lowered for user refrigeration, which improves the safety of the user's air conditioner.

As shown in FIG. 28 , an air duct is provided between the air outlet side of the first surface cooler 7 and the air inlet of the filler 2 of the indirect evaporative cooling water supply device, and a second air outlet 13 is provided on the bottom surface of the air duct. By closing the second tuyere 13, the fresh air enters the packing 2 to produce cold water after being pre-cooled by the first surface cooler 7, and in a certain period of time, by opening the second tuyere 13, the fresh air directly enters the packing 2 through the second tuyere 13 to produce cold water , reducing the exhaust resistance of the first blower fan 7, and reducing energy consumption throughout the year.

Claims (27)

1. A closed precooling indirect evaporative cooling device, characterized in that: a first exhaust fan (3) and a spray device (4) are arranged above the packing (2) in the case (1), and the packing The bottom of (2) is provided with water tank (5), is provided with the first air inlet (6) between filler (2) and water tank (5), and the first surface cooler (7) is installed on the water tank (5) The first outlet pipe is connected to the inlet of the primary side of the plate heat exchanger (9) through the first circulating pump (8), the outlet pipe is connected to the spray device (4), and the outlet of the secondary side of the plate heat exchanger (9) The pipe is connected to the inlet of the first surface cooler (7) through the second circulation pump (10) and the user (11), and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger (9); or in the first table The air outlet side of the cooler (7) is provided with a closed coil (37), and the outlet pipe of the closed coil (37) is connected to the first surface cooler ( 7), the outlet pipe of which is connected to the inlet of the closed coil (37), and the outlet pipe of the water tank (5) is connected to the spraying device (4) by the first circulation pump (8). 2. The closed precooling indirect evaporative cooling device according to claim 1, characterized in that: a second surface cooler (12) is arranged on the air outlet side of the first surface cooler (7), The pipeline connecting the secondary circulating pump (10) to the user (11) is provided with a bypass, which is connected to the inlet of the second surface cooler (12), and its outlet pipe is connected to the inlet pipe of the first surface cooler (7). superior. 3. The closed precooling indirect evaporative cooling device according to claim 2, characterized in that: the outlet pipe of the second surface cooler (12) is connected to the outlet pipe of the first surface cooler (7). 4. The closed precooling indirect evaporative cooling device according to claim 1, characterized in that: a bypass is set on the pipeline connecting the primary side inlet of the first circulation pump (8) to the plate heat exchanger (9) , the bypass is connected to the inlet of the second surface cooler (12), and its outlet pipe is connected to the spraying device (4). 5. The closed-type precooling indirect evaporative cooling device according to claim 1, characterized in that: an air box is arranged between the air outlet side of the first surface cooler (7) and the chassis (1), and the air box The air outlet is provided with a second exhaust fan (16), which is located in the air box, and the air chamber is connected between the air outlet side of the first surface cooler (7) and the air inlet side of the second surface cooler (12). The bottom and top of the cavity are respectively provided with the second air outlet (13) and the third air outlet (14), and the fourth air outlet (15) is arranged obliquely in the air chamber, and the outlet pipe of the user (11) is connected with the second surface cooler The inlet of (12), its outlet pipe is connected with the inlet of the first surface cooler (7). 6. The closed precooling indirect evaporative cooling device according to claim 5, characterized in that: a bypass is set on the pipeline between the second circulating pump (10) and the inlet of the user (11), and the bypass Connected to the inlet of the second surface cooler (12), the outlet pipe of the user (11) is connected to the inlet of the first surface cooler (7), and the outlet pipe of the second surface cooler (12) is connected to the first surface cooler Inlet pipe of device (7). 7. The closed precooling indirect evaporative cooling device according to claim 5, characterized in that: a bypass is set on the pipeline connecting the first circulation pump (8) to the inlet of the primary side of the plate heat exchanger (9) , the bypass is connected to the inlet of the second surface cooler (12), its outlet pipe is connected to the spray device (4), and the outlet pipe of the secondary side of the plate heat exchanger (9) passes through the second circulating pump (10) and The user (11) is connected to the inlet of the first surface cooler (7), and its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger (9). 8. The closed precooling indirect evaporative cooling device according to claim 5, characterized in that: a bypass is set on the pipeline connecting the second circulation pump (10) to the user (11) inlet, and the bypass passes through the first A valve (17) is connected to the inlet of the second surface cooler (12), the outlet pipe of the user (11) is connected to the inlet of the first surface cooler (7) through the third valve (19), and passes through the set side The road is connected to the outlet of the second surface cooler (12), and a bypass is set on the outlet pipe of the user (11), and the bypass is connected to the first valve (17) after the first valve (17) through the second valve (18). On the bypass that the outlet pipe of the secondary circulation pump (10) is set. 9. The closed precooling indirect evaporative cooling device according to claim 5, characterized in that: a bypass is set on the pipeline connecting the second circulation pump (10) to the user (11) inlet, and the bypass passes through the first A valve (17) and the tee are connected to the inlet of the second surface cooler (12), and another interface of the tee is connected to the outlet pipe of the first surface cooler (7) through the second valve (18), and the user ( 11) The outlet pipe is connected with the inlet of the first surface cooler (7). 10. The closed precooling indirect evaporative cooling device according to claim 5, characterized in that: an air inlet box is arranged between the air outlet side of the second surface cooler (12) and the air inlet of the chassis (1), Sixth and seventh air outlets (21, 22) are respectively arranged on the top and bottom of the air inlet box, and a fifth inlet (20) is arranged at the air inlet of the chassis (1). 11. The closed precooling indirect evaporative cooling device according to claim 10, characterized in that: a bypass is set on the pipeline connecting the second circulation pump (10) to the user (11) inlet, and the bypass is connected to The inlet of the second surface cooler (12), the outlet pipe of the user (11) is connected to the inlet of the first surface cooler (7), and the outlet pipe of the second surface cooler (12) is connected to the outlet pipe of the user (11). connect. 12. The closed precooling indirect evaporative cooling device according to claim 10, characterized in that: the outlet pipe of the user (11) is connected to the inlet of the first surface cooler (7), and the outlet pipe is connected to the plate type At the inlet of the secondary side of the heat exchanger (9), a bypass is set on the pipeline connecting the first circulating pump (8) to the inlet of the primary side of the plate heat exchanger (9), and the bypass is connected to the second surface cooler (12) The inlet, whose outlet pipe is connected to the sprinkler (4). 13. The closed precooling indirect evaporative cooling device according to claim 5, characterized in that: a bypass is set on the pipeline connecting the second circulation pump (10) to the user (11) inlet, and the bypass is connected to The inlet of the second surface cooler (12), its outlet pipe is connected to the inlet of the secondary side of the plate heat exchanger (9), and the outlet pipe of the user (11) is connected to the inlet of the first surface cooler (7). The outlet pipe is connected with the outlet pipe of the second surface cooler (12). 14. The closed precooling indirect evaporative cooling device according to claim 5, characterized in that: the outlet pipe of the user (11) is connected to the inlet of the first surface cooler (7), and the outlet pipe is connected to the plate type The inlet of the secondary side of the heat exchanger (9), the second outlet pipe of the water tank (5) is connected to the inlet of the second surface cooler (12) through the third circulation pump (23), and the outlet pipe passes through the three and the fourth valve (24) are connected to the spray device (4), the other interface of the tee is connected to the water tank (5) through the fifth valve (25), and the outlet pipe of the primary side of the plate heat exchanger (9) passes through The provided tee and the sixth valve (26) are connected to the sprinkler (4), and the other interface of the tee is connected to the water tank (5) through the seventh valve (27), and a partition is arranged in the water tank (5). The plate (28) separates the lower part of the water tank (5), and the water level of the upper part is connected. The first and second outlet pipes of the water tank (5) are respectively connected to the water tank (5) separated by the clapboard (28). on the water outlet. 15. The closed precooling indirect evaporative cooling device according to claim 5, characterized in that: the outlet pipe of the user (11) is connected to the inlet of the first surface cooler (7), and the outlet pipe is connected to the plate type The inlet of the secondary side of the heat exchanger (9), the outlet pipe of the first circulating pump (8) is connected to the inlet of the primary side of the plate heat exchanger (9) through a tee, and the other interface pipe of the tee passes through the sixth valve (26) is connected to the inlet of the second surface cooler (12), its outlet pipe is connected to the spraying device (4) through the fourth valve (24), and the outlet pipe of the water tank (5) is connected through the fifth valve (25) On the outlet pipe of the second surface cooler (12) behind the fourth valve (24), the outlet pipe on the primary side of the plate heat exchanger (9) is connected to the nozzle through the set tee and the eighth valve (29). Shower device (4), another interface pipe of tee is connected on the inlet pipe of the second surface cooler (12) by the seventh valve (27). 16. The closed precooling indirect evaporative cooling device according to claim 1, characterized in that: an air box is arranged on the air inlet side of the chassis (1), and a first air inlet (6) is arranged on the air box, The first surface cooler (7) is arranged on the first air inlet (6), and the air inlet box is arranged between the air inlet side of the chassis (1) and the air outlet side of the first surface cooler (7). The sixth and seventh air inlets (21, 22) are respectively arranged on the top and the bottom, and the fifth inlet (20) is arranged at the air inlet of the chassis (1). 17. The closed-type precooling indirect evaporative cooling device according to claim 1, characterized in that: the primary side outlet pipe of the plate heat exchanger (9) is connected to the cooling water inlet of the mechanical refrigeration unit (30), and its outlet pipe Connected to the spraying device (4), the chilled water outlet pipe of the mechanical refrigeration unit (30) is connected to the inlet of the first surface cooler (7) through the second circulation pump (10) and the user (11), and the plate heat exchanger ( 9) The outlet pipe on the secondary side is connected to the inlet of the chilled water of the mechanical refrigeration unit (30). 18. The closed-type precooling indirect evaporative cooling device according to claim 1, characterized in that: the outlet pipe on the primary side of the plate heat exchanger (9) is connected to the mechanical refrigeration unit (30) through the set three-way The cooling water inlet, the cooling water outlet pipe of the mechanical refrigeration unit (30) is connected to the spray device (4), and the other interface pipe of the tee is connected to the cooling water outlet of the mechanical refrigeration unit (30) through the ninth valve (31). The outlet pipe of the secondary side of the plate heat exchanger (9) is connected to the chilled water inlet of the mechanical refrigeration unit (30), and the chilled water outlet pipe of the mechanical refrigeration unit (30) passes through the set tee and the second circulation pump (10) It is connected to the inlet of the first surface cooler (7) with the user (11), and the other interface of the tee is connected to the outlet pipe of the secondary side of the plate heat exchanger (9) through the tenth valve (32). 19. The closed precooling indirect evaporative cooling device according to claim 1, characterized in that: the exhaust pipe of the first exhaust fan (3) is connected to the outdoor unit heat exchanger (33) of the air-cooled mechanical refrigeration unit The air inlet of the outdoor unit heat exchanger (33) is connected with the indoor unit heat exchanger (34) by the refrigerant inlet and outlet pipes of the outdoor unit heat exchanger (33). 20. The closed precooling indirect evaporative cooling device according to claim 1, characterized in that: an air box with an eighth air inlet (35) and an air outlet is arranged on the upper part of the first surface cooler (7) , the third surface cooler (36) is arranged on the eighth air inlet (35), the second exhaust fan (16) is arranged on the air outlet, and the outlet pipe of the first surface cooler (7) is connected to the third The inlet of the surface cooler (36), its outlet pipe is connected with the inlet of the secondary side of the plate heat exchanger (9). 21. The closed precooling indirect evaporative cooling device according to claim 20, characterized in that: a second surface cooler (12) is arranged on the air outlet side of the first surface cooler (7), and its outlet The pipe is connected to the outlet pipe of the user (11), and a bypass is arranged on the connecting pipe between the second circulating pump (10) and the user (11), and the bypass is connected to the inlet of the second surface cooler (12). 22. The closed precooling indirect evaporative cooling device according to claim 21, characterized in that: a bypass is set on the pipeline connecting the first circulation pump (8) to the primary side inlet of the plate heat exchanger (9), The bypass is connected to the inlet of the second surface cooler (12), its outlet pipe is connected to the spray device (4), and the outlet pipe of the secondary side of the plate heat exchanger (9) passes through the second circulating pump (10) and the user (11) is connected with the inlet of the first surface cooler (7). 23. The closed precooling indirect evaporative cooling device according to claim 1, characterized in that: the closed coil (37) is arranged in the water tank (5) at the lower part of the air outlet side of the first surface cooler (7) Inside. 24. The closed precooling indirect evaporative cooling device according to claim 1, characterized in that: the user (11) is a unit equipped with a high-temperature surface cooler (39) and a low-temperature surface cooler (40), the first The outlet pipe of the secondary circulation pump (10) is connected to the inlet of the user's high-temperature surface cooler (39), its outlet pipe is connected to the inlet of the first surface cooler (7), and the outlet pipe of the first surface cooler (7) is connected to The inlet of the secondary side of the plate heat exchanger (9), the outlet pipe of the user’s low-temperature surface cooler (40) is connected to the cooling water inlet of the air-cooled mechanical refrigeration unit (38), and the cooling water outlet pipe is connected to the low-temperature surface cooler (40) Imports. 25. The closed precooling indirect evaporative cooling device according to claim 24, characterized in that: the first exhaust fan (3) communicates with the air inlet of the condenser of the air-cooled mechanical refrigeration unit (38) through the exhaust pipe connect. 26. The closed-type precooling indirect evaporative cooling device according to claim 1, characterized in that: the closed-type coil (37) is arranged at the lower part of the air outlet side of the first surface cooler (7), located in the water tank ( 5) above. 27. The closed precooling indirect evaporative cooling device according to claim 1, characterized in that: between the air outlet side of the first surface cooler (7) and the air inlet of the indirect evaporative water supply device filler (2) An air duct is arranged, and a second air port (13) is arranged on the bottom surface of the air duct.