CN214370660U

CN214370660U - Counter-flow external cooling type indirect evaporative cooling air conditioner

Info

Publication number: CN214370660U
Application number: CN202120057143.1U
Authority: CN
Inventors: 于向阳
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2021-10-08
Anticipated expiration: 2031-01-08

Abstract

The utility model discloses a counter-current external cooling type indirect evaporative cooling air conditioning device, which is composed of a cold source device and an air treatment device. The exhaust box of the exhaust fan and the mechanical refrigeration unit, the air handling device includes a return air box with a return air outlet, a high temperature surface cooler, a low temperature surface cooler and a blower; in the cold source device, the mechanical refrigeration unit is arranged on the upper part of the side of the evaporative refrigeration section, The cold storage device is arranged on the side of the evaporative refrigeration section; the return air box of the air treatment device is communicated with the air treatment chamber; the water outlet pipe of the circulating water tank is communicated with the inlet of the high temperature surface cooler through the high temperature circulating water pump. The utility model has a reasonable structure, can solve the problems of dew condensation and antifreeze during the winter operation of the data center air conditioning system, improve the heat exchange efficiency of the unit, and effectively reduce the operating energy consumption of the unit.

Description

Counterflow external cooling type indirect evaporative cooling air conditioner

Technical Field

The utility model belongs to the air treatment equipment in heating and ventilating air conditioning field, in particular to an indirect evaporative cooling air conditioning device with counterflow and external cooling.

Background

With the development of 5G technology, cloud computing and artificial intelligence, the development of data centers is faster and faster, and in order to reduce the energy consumption of the data centers, more and more severe energy-saving indexes are provided, so that the reduction of the operation energy consumption of the data centers is not slow. In the operation energy consumption of the data center, the refrigeration accounts for 20% -30% of the operation energy consumption, so that the refrigeration energy consumption of the data center is reduced, and the PUE of the data center can be greatly reduced.

In order to reduce the energy consumption of an air conditioning system of a data center and shorten the construction period of the data center, most of common modularized air conditioning units at the present stage are internal-cooling type indirect evaporative cooling units, but the internal-cooling type indirect evaporative cooling units have the problems of scaling blockage, corrosion, dewing during operation in winter, large occupied area and the like of a heat exchange core, and when the internal-cooling type indirect evaporative cooling units are adopted, the problem of cold accumulation after power failure is difficult to solve, and an additional water storage tank is required to be arranged for water storage, so that the additional building area is occupied.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an indirect evaporative cooling air conditioning equipment of outer cold type against current, its is rational in infrastructure, can solve the dewfall and the frost-proof problem of data center air conditioning system when moving winter, promotes the heat exchange efficiency of unit, the operation energy consumption of effectual reduction unit.

The purpose of the utility model is realized like this: a counter-current external cooling type indirect evaporative cooling air conditioning device comprises a cold source device and an air treatment device, wherein the cold source device comprises an evaporative cooling section and a cold accumulation device which are composed of a water distribution device, a filler and a circulating water tank, an air exhaust box provided with an exhaust fan and a mechanical refrigerating unit, and the air treatment device comprises an air return box with an air return opening, a high-temperature surface cooler, a low-temperature surface cooler and a blower; the cold source device is characterized in that a mechanical refrigerating unit is arranged at the upper part of the side of the evaporation refrigerating section, an air exhaust box is arranged at the top of the evaporation refrigerating section, an inlet of the air exhaust box is communicated with an air outlet of the evaporation refrigerating section, and a cold accumulation device is arranged at the side part of the evaporation refrigerating section; the air return box of the air treatment device is communicated with the air treatment chamber, a composite cooler is arranged in the air treatment chamber, the structure of the air treatment device is that a filter screen, a high-temperature surface cooler and a low-temperature surface cooler are sequentially arranged in parallel according to the flowing direction of air, the composite cooler divides the air treatment chamber into an air inlet chamber and an air outlet chamber, and the air outlet chamber is communicated with an air supply box provided with a blower; the air supply box is provided with an air supply outlet; the water outlet pipe of the circulating water tank is communicated with the inlet of the high-temperature surface cooler through a high-temperature circulating water pump, the outlet pipe of the circulating water tank is communicated with the water side inlet of the condenser of the mechanical refrigerating unit, the water side outlet pipe of the condenser of the mechanical refrigerating unit is communicated with the water distribution device, or the outlet pipe of the high-temperature circulating water pump is respectively communicated with the inlet of the high-temperature surface cooler and the inlet of the condenser of the mechanical refrigerating unit, the outlet of the high-temperature surface cooler and the outlet of the condenser of the mechanical refrigerating unit are communicated with the water distribution device, the outlet of the cold storage device is communicated with the inlet of the low-temperature surface cooler, the outlet pipe of the low-temperature surface cooler is communicated with the water side inlet of the evaporator of the mechanical refrigerating unit, the water side outlet pipe of the evaporator is communicated with the inlet of the cold storage device, the low-temperature circulating water pump is arranged on the low-temperature circulating pipeline, and the long running water pipe arranged on the high-temperature surface cooler is connected with the circulating water tank.

The utility model discloses an indirect evaporative cooling air conditioning unit of outer cold type against the current, the indirect evaporative cooling unit principle of outer cold type against the current can prepare cold water for utilizing outdoor dry air, with cold water supply surface cooler, utilizes the return air in the surface cooler cooling chamber, has avoided interior cold type heat transfer core structure to block up, the problem of corruption, in addition the utility model discloses an also be provided with water storage device and cold-storage device in the device, utilize water among the water storage device to carry out the moisturizing after cutting off the water, cold water among the usable cold storage device supplies cold when having a power failure, the utility model discloses a structural design who optimizes can effectual reduction air conditioning equipment's area occupied.

The utility model discloses a packing refrigeration against the current, great promotion the heat exchange efficiency of unit, the effectual operation energy consumption that reduces the unit, the moisture condensation and the frost-proof problem of solution data center air conditioning system when operation winter, the utility model discloses increase dry cold ware, utilize the antifreeze liquid in the dry cold ware of outdoor low temperature air cooling winter, fundamentally solves the problem of preventing frostbite and moisture condensation winter.

The utility model discloses it is rational in infrastructure, solved the dewfall and the frost-proof problem of data center air conditioning system when operation winter, promoted the heat exchange efficiency of unit, the effectual operation energy consumption that reduces the unit.

Drawings

The present invention will be further described with reference to the accompanying drawings, wherein 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, fig. 4 is a schematic structural view of embodiment 4 of the present invention, fig. 5 is a schematic structural view of embodiment 5 of the present invention, fig. 6 is a schematic structural view of embodiment 6 of the present invention, fig. 7 is a schematic structural view of embodiment 7 of the present invention, fig. 8 is a schematic structural view of embodiment 8 of the present invention, fig. 9 is a schematic structural view of embodiment 9 of the present invention, fig. 10 is a schematic structural view of embodiment 10 of the present invention, fig. 11 is a schematic structural view of embodiment 11 of the present invention, fig. 12 is a schematic structural view of embodiment 12 of the present invention, fig. 13 is a schematic structural view of embodiment 13 of the present invention, fig. 14 is a schematic structural view of embodiment 14 of the present invention, fig. 15 is a schematic structural view of embodiment 15 of the present invention, fig. 16 is a schematic structural view of embodiment 16 of the present invention, fig. 17 is a schematic structural view of embodiment 17 of the present invention, fig. 18 is a schematic structural view of embodiment 18 of the present invention, fig. 19 is a schematic structural view of embodiment 19 of the present invention, fig. 20 is a schematic structural view of embodiment 20 of the present invention, fig. 21 is a schematic structural view of embodiment 21 of the present invention, fig. 22 is a schematic structural view of embodiment 22 of the present invention, fig. 23 is a schematic structural view of embodiment 23 of the present invention, fig. 24 is a schematic structural view of embodiment 24 of the present invention, fig. 25 is a schematic structural view of embodiment 25 of the present invention, fig. 26 is a schematic structural view of embodiment 26 of the present invention, fig. 27 is a schematic structural view of embodiment 27 of the present invention, fig. 28 is a schematic structural view of embodiment 28 of the present invention, fig. 29 is the embodiment of the utility model discloses a 29 schematic structure diagram, fig. 30 is the utility model discloses a 30 schematic structure diagram, fig. 31 is the utility model discloses a 31 schematic structure diagram, fig. 32 is the utility model discloses a 32 schematic structure diagram, fig. 33 is the utility model discloses a 33 schematic structure diagram, fig. 34 is the utility model discloses an 34 schematic structure diagram, fig. 35 is the utility model discloses an 35 schematic structure diagram, fig. 36 is the utility model discloses an 36 schematic structure diagram, fig. 37 is the utility model discloses an embodiment 37 schematic structure diagram, fig. 38 is the utility model discloses an 38 schematic structure diagram, fig. 39 is the utility model discloses an 39 embodiment 39 schematic structure diagram, fig. 40 is the utility model discloses embodiment 40 schematic structure diagram, fig. 41 is the utility model discloses embodiment 41 schematic structure diagram, fig. 42 is the utility model discloses embodiment 42 schematic structure diagram.

Detailed Description

A counter-current external cooling type indirect evaporative cooling air conditioning device, as shown in figure 1, is composed of a cold source device and an air treatment device, wherein the cold source device comprises an evaporative cooling section and a cold accumulation device 5 which are composed of a water distribution device 2, a filler 6 and a circulating water tank 7, an exhaust box 1 which is provided with an exhaust fan 3 and a mechanical refrigerating unit 4, and the air treatment device comprises a return air box 10 with a return air inlet 11, a high-temperature surface cooler 13, a low-temperature surface cooler 12 and a blower 17; the mechanical refrigerating unit 4 in the cold source device is arranged at the upper part of the side of the evaporation refrigerating section, the air exhaust box 1 is arranged at the top of the evaporation refrigerating section, the inlet of the air exhaust box 1 is communicated with the air outlet of the evaporation refrigerating section, and the cold accumulation device 5 is arranged at the side part of the evaporation refrigerating section; the air return box 10 of the air treatment device is communicated with an air treatment chamber, a composite cooler is arranged in the air treatment chamber, the structure of the air treatment device is that a filter screen 14, a high-temperature surface cooler 13 and a low-temperature surface cooler 12 are sequentially arranged in parallel according to the flowing direction of air, the composite cooler divides the air treatment chamber into an air inlet chamber and an air outlet chamber, and the air outlet chamber is communicated with an air supply box provided with a blower 17; the air supply box is provided with an air supply outlet 16; the water outlet pipe of the circulating water tank 7 is communicated with the inlet of the high-temperature surface cooler 13 through a high-temperature circulating water pump 8, the outlet pipe of the circulating water tank is communicated with the water side inlet of the condenser of the mechanical refrigerating unit 4, the water side outlet pipe of the condenser is communicated with the water distribution device 2, or the outlet pipe of the high-temperature circulating water pump 8 is respectively communicated with the inlet of the high-temperature surface cooler 13 and the inlet of the condenser of the mechanical refrigerating unit 4, the outlet of the high-temperature surface cooler 13 and the outlet of the condenser of the mechanical refrigerating unit 4 are communicated with the water distribution device 2, the outlet of the cold storage device 5 is communicated with the inlet of the low-temperature surface cooler 12, the outlet pipe of the low-temperature surface cooler 12 is communicated with the water side inlet of the evaporator of the mechanical refrigerating unit 4, the water side outlet pipe of the evaporator is communicated with the inlet of the cold storage device 5, the low-temperature circulating water pump 9 is arranged on the low-temperature circulating pipeline, and the long running water pipe 15 arranged on the high-temperature surface cooler 13 is connected with the circulating water tank 7.

The utility model comprises a cold source device and an air processing device, wherein the cold source device comprises an evaporation refrigeration section, a mechanical refrigeration unit 4, a cold accumulation device 5, an air exhaust box 1 and the like; the evaporation refrigeration section comprises a water distribution device 2, a filler 6, a circulating water tank 7 and the like. The air treatment device comprises a return air box 10, a high-temperature surface cooler 13, a low-temperature surface cooler 12, a blower 17 and the like. The mechanical refrigerating unit 4 in the cold source device is longitudinally arranged at the upper part of the side of the evaporation refrigerating section, the exhaust box 1 is arranged at the top of the evaporation refrigerating section, wherein the inlet of the exhaust box 1 is communicated with the outlet of the evaporation refrigerating section, the outlet of the exhaust box 1 is communicated with the inlet of the exhaust fan 3, and the exhaust fan 3 can be arranged at the top/end part of the exhaust box 1; the cold accumulation water tank is arranged at the side part of the cold source device; the air treatment device can be arranged on one side of the cold source device or be separately arranged. The inlet of an air return device in the air treatment device is communicated with indoor return air, the outlet of the air return device is communicated with the inlet of a high-temperature surface cooler 13, the outlet of the high-temperature surface cooler 13 is communicated with the inlet of a low-temperature surface cooler 12, and the outlet of the low-temperature surface cooler 12 is communicated with the inlet of a blower 17. The air treatment device high-temperature surface cooler 13 is provided with a long flowing water pipe 15, the long flowing water pipe 15 is provided with a valve in class, and the long flowing water pipe 15 is communicated with the circulating water tank 7; when the unit is in operation, the long-flow water pipe 15 can discharge water regularly or continuously to discharge sundries in the pipe to the water tank, when the unit stops operation, the long-flow water pipe 15 is in an open state to discharge all water in the high-temperature surface cooler 13 to the circulating water tank 7, so that impurities in the water in the high-temperature surface cooler 13 are prevented from depositing on the wall of the heat exchange pipe, and the heat exchange efficiency is reduced.

An outlet of a circulating water tank 7 of the cold source device is communicated with an inlet of a high-temperature circulating water pump 8, an outlet of the high-temperature circulating water pump 8 is communicated with an inlet of a high-temperature surface cooler 13 of the air treatment device, an outlet of the high-temperature surface cooler 13 is communicated with an inlet of a condenser water side of the mechanical refrigerating unit 4, and an outlet of the condenser water side of the mechanical refrigerating unit 4 is communicated with the water distribution device 2; or the outlet of the high-temperature circulating water pump 8 is respectively communicated with the inlet of the high-temperature surface cooler 13 and the inlet of the condenser water side of the mechanical refrigerating unit 4, and the outlet of the high-temperature surface cooler 13 and the outlet of the condenser water side of the mechanical refrigerating unit 4 are communicated with the water distribution device 2; the outlet of the cold accumulation device 5 is communicated with the inlet of a low-temperature surface cooler 12 of the air treatment device, the outlet of the low-temperature surface cooler 12 is communicated with the inlet of the water side of an evaporator of the mechanical refrigerating unit 4, the outlet of the water side of the evaporator of the mechanical refrigerating unit 4 is communicated with the inlet of the cold accumulation device 5, and a low-temperature circulating water pump 9 is arranged on a circulating pipeline.

The first operation mode is as follows: when outdoor air is dry, only evaporation refrigeration is adopted; high-temperature cold water in the circulating water tank 7 is supplied to a high-temperature surface air cooler 13 through a high-temperature circulating water pump 8 to take away heat of indoor return air, water with increased temperature enters the water distribution device 2 through mechanical refrigeration, and is sprayed into the filler 6 through the water distribution device 2 to exchange heat with outdoor dry air to take away heat in the water, so that the water temperature is reduced and falls into the circulating water tank 7; outdoor air enters the filler 6 through an air inlet of the evaporation refrigeration section to exchange heat and mass with water, and is exhausted to the outside through the exhaust fan 3 through the exhaust box 1. Or the cold water in the circulating water tank 7 is supplied to the high-temperature surface air cooler 13 through the high-temperature circulating water pump 8 to take the heat of the return air away, and then directly enters the water distribution device 2 to perform heat-mass exchange with outdoor air, so that the water temperature is reduced.

And a second operation mode: when the outdoor air is wet, when the refrigeration requirement cannot be met by adopting evaporative refrigeration, the evaporative refrigeration and mechanical refrigeration are required to be operated in a combined manner; high-temperature cold water in the circulating water tank 7 is supplied to the high-temperature surface air cooler 13 through the high-temperature circulating water pump 8, takes away heat of an indoor return air part, enters the condenser of the mechanical refrigerating unit 4 after the water temperature rises, takes away heat of the mechanical refrigerating unit 4, then enters the water distribution device 2, and reduces the water temperature through heat-mass exchange with outdoor dry air. After the mechanical refrigerating unit 4 is started, low-temperature water is supplied to a low-temperature surface cooler 12 through a low-temperature circulating water pump 9, return air passing through a high-temperature surface cooler 13 is recooled, and the cooled return air is sent to the indoor through a blower 17; the cold water in the low-temperature surface cooler 12 enters a mechanical refrigeration evaporator for refrigeration and then enters the cold accumulation device 5 to form a cycle. Or the cold water in the circulating water tank 7 is simultaneously supplied to the mechanical refrigeration condenser and the high-temperature surface air cooler 13 through the circulating water pump, takes away the heat of the return air and the condenser, finally returns to the water distribution device 2, and carries out heat and mass exchange with outdoor dry air, so that the water temperature is reduced.

As shown in fig. 2, the outlet pipe of the high temperature surface cooler 13 is respectively communicated with the water inlet of the condenser of the mechanical refrigerating unit 4 and the inlet of the water distribution device 2, the pipeline communicated with the water distribution device 2 is provided with a regulating valve, and the condenser long-flowing water pipe 18 arranged on the condenser of the mechanical refrigerating unit 4 is connected with the circulating water tank 7.

The outlet of the high temperature surface cooler 13 is respectively communicated with the inlet of the mechanical refrigerating unit 4 at the condenser water side and the inlet of the water distribution device 2, and an adjusting valve is additionally arranged on a pipeline communicated with the water distribution device 2. A long flowing water pipe 15 is arranged on a condenser of the mechanical refrigerating unit 4, and the long flowing water pipe 15 is communicated with the circulating water tank 7; the water in the condenser of the mechanical refrigerating unit 4 is always in a flowing state, and impurities in the water are not easy to deposit in the condenser, so that the heat exchange and the service life of the condenser are influenced; when the high-temperature water stops running, the water in the condenser completely flows into the circulating water tank 7 through the long-flowing water pipe 15, and the condenser is prevented from being frozen in winter. When the high-temperature water amount is larger than the cooling water amount required by the mechanical refrigeration condenser, redundant cold water can directly enter the water distribution device 2; or when the mechanical refrigerating unit 4 is closed, the regulating valve on the communicating pipe between the high-temperature surface cooler 13 and the water distribution device 2 is opened, so that the resistance of the system pipeline can be reduced, and the power consumption of the water pump is further reduced.

As shown in fig. 3, an inlet of the low-temperature circulating water pump 9 is respectively communicated with an outlet of the cold accumulation device 5 and an evaporator water side outlet of the mechanical refrigeration unit 4, an outlet of the low-temperature circulating water pump 9 is communicated with an inlet of the low-temperature surface cooler 12, an outlet of the low-temperature surface cooler 12 is communicated with an evaporator water side inlet of the mechanical refrigeration unit 4, an evaporator water side outlet of the mechanical refrigeration unit 4 is respectively communicated with an inlet of the low-temperature circulating water pump 9 and an inlet of the cold accumulation device 5, a first valve 19 is arranged on an inlet pipe of the cold accumulation device 5, and a second valve 20 is arranged on a communication pipeline between the evaporator water side outlet of the mechanical refrigeration unit 4 and the inlet of the low-temperature circulating water pump 9.

The inlet of the low-temperature water pump is respectively communicated with the outlet of the cold accumulation device 5 and the water side outlet of the mechanical refrigeration evaporator, the outlet of the water pump is communicated with the inlet of the low-temperature surface cooler 12, the outlet of the low-temperature surface cooler 12 is communicated with the water side inlet of the mechanical refrigeration evaporator, and the water side outlet of the evaporator of the mechanical refrigeration unit 4 is respectively communicated with the inlet of the low-temperature circulating water pump 9 and the inlet of the cold accumulation device 5; a first valve 19 is arranged on an inlet pipeline of the cold accumulation device 5, and a second valve 20 is arranged on a pipeline communicating an outlet of the water side of an evaporator of the mechanical refrigerating unit 4 with an inlet of the low-temperature circulating water pump 9; the pipeline design mainly solves the problems of cold discharge and cold accumulation of the cold accumulation device 5; when the unit normally operates, a second valve 20 on a pipeline for communicating the mechanical refrigeration evaporator and the inlet of the low-temperature water pump is closed, and a first valve 19 on a pipeline for communicating the water side outlet of the mechanical refrigeration evaporator and the cold accumulation device 5 is opened, so that all prepared cold water enters the cold accumulation device 5 and is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9; or, the valves on the communicating pipes of the water side outlet of the mechanical refrigeration evaporator and the inlets of the cold accumulation device 5 and the low-temperature circulating water pump 9 are all opened to a certain state, so that part of cold water prepared by the mechanical refrigeration unit 4 enters the cold accumulation device 5, and part of cold water is directly supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9, so that the running resistance of a low-temperature circulating pipeline can be reduced, and the power consumption of the water pump is further reduced; when the mains supply is powered off and the cold accumulation device 5 needs to be cooled, the second valve 20 on the pipeline for communicating the mechanical refrigeration evaporator and the inlet of the low-temperature water pump needs to be closed, the first valve 19 on the pipeline for communicating the water side outlet of the mechanical refrigeration evaporator and the cold accumulation device 5 is opened, and low-temperature cold water in the cold accumulation tank is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9. When the standby power supply is normally started or the mains supply is recovered, and the cold accumulation tank needs to accumulate cold again, because the temperature of the cold accumulation tank is higher after the cold accumulation tank is cooled, when the mechanical refrigeration recovers the refrigeration, the requirement of cold supply needs to be ensured at first, so that a valve on a pipeline for communicating an outlet at the water side of an evaporator of the mechanical refrigeration unit 4 with an inlet of the low-temperature circulating water pump 9 needs to be opened, and the refrigeration of the low-temperature surface cooler 12 is ensured; meanwhile, the opening degree of a valve on a pipeline for communicating the water side outlet of the evaporator of the mechanical refrigerating unit 4 with the inlet of the cold accumulation device 5 is adjusted, so that a small part of cold water enters the cold accumulation tank for cold accumulation, and the system can be adjusted to a normal operation mode until the cold accumulation is finished.

As shown in fig. 4, the inlet of the low-temperature circulating water pump 9 is respectively communicated with the outlet of the cold storage device 5 and the outlet of the evaporator water side of the mechanical refrigerating unit 4, the outlet of the low-temperature circulating water pump 9 is communicated with the inlet of the low-temperature surface cooler 12, the outlet of the low-temperature circulating water pump is communicated with the inlet of the evaporator water side of the mechanical refrigerating unit 4, the outlet of the evaporator water side of the mechanical refrigerating unit 4 is respectively communicated with the inlet of the low-temperature circulating water pump 9 and the inlet of the cold storage device 5, a third valve 21 is arranged on the outlet pipe of the cold storage device 5, and a second valve 20 is arranged on the communication pipeline between the outlet of the evaporator water side of the mechanical refrigerating unit 4 and the inlet of the low-temperature circulating water pump 9.

The inlet of the low-temperature water pump is respectively communicated with the outlet of the cold accumulation device 5 and the water side outlet of the mechanical refrigeration evaporator, the outlet of the water pump is communicated with the inlet of the low-temperature surface cooler 12, the outlet of the low-temperature surface cooler 12 is communicated with the water side inlet of the mechanical refrigeration evaporator, and the water side outlet of the evaporator of the mechanical refrigeration unit 4 is respectively communicated with the inlet of the low-temperature circulating water pump 9 and the inlet of the cold accumulation device 5; a third valve 21 is arranged on an outlet pipeline of the cold accumulation device 5, and a second valve 20 is arranged on a pipeline communicating an outlet of the evaporator water side of the mechanical refrigerating unit 4 with an inlet of the low-temperature circulating water pump 9; the pipeline design mainly solves the problems of cold discharge and cold accumulation of the cold accumulation device 5; when the unit normally operates, a second valve 20 on a pipeline for communicating the mechanical refrigeration evaporator and the inlet of the low-temperature water pump is closed, and a third valve 21 on the outlet of the cold accumulation device 5 is opened, so that all prepared cold water enters the cold accumulation device 5 and is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9; or, the second valve 20 and the third valve 21 are both opened to a certain state, so that a part of cold water prepared by the mechanical refrigerating unit 4 enters the cold storage device 5, and a part of cold water is directly supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9, so that the running resistance of a low-temperature circulating pipeline can be reduced, and the power consumption of the water pump is further reduced; when the commercial power is cut off and the cold accumulation device 5 needs to be cooled, the second valve 20 on the pipeline for communicating the mechanical refrigeration evaporator and the inlet of the low-temperature water pump needs to be closed, the third valve 21 needs to be opened, and low-temperature cold water in the cold accumulation tank is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9. When the standby power supply is normally started or the mains supply is recovered, and the cold accumulation tank needs to accumulate cold again, because the temperature of the cold accumulation tank is higher after the cold accumulation tank is cooled, when the mechanical refrigeration recovers the refrigeration, the requirement of the cold supply needs to be ensured firstly, so that a second valve 20 on a pipeline for communicating an outlet at the water side of an evaporator of the mechanical refrigeration unit 4 with an inlet of the low-temperature circulating water pump 9 needs to be opened, and the refrigeration of the low-temperature surface cooler 12 is ensured; meanwhile, the opening degree of the valve III 21 is adjusted, so that a small part of cold water enters the cold accumulation tank for cold accumulation, and the system can be adjusted to a normal operation mode until the cold accumulation is finished.

As shown in fig. 5, a first valve 19 is provided at the inlet pipe of the cold storage device 5.

A first valve 19 is arranged on an inlet pipeline of the cold accumulation device 5; after the first valve 19 is arranged, the opening degree of the first valve 19 and the opening degree of the third valve 21 of the cold accumulation device 5 can be controlled by the open cold accumulation device 5, and the water inlet and outlet quantity of the cold accumulation device 5 is ensured to be consistent. When the unit normally operates, a second valve 20 on a pipeline for communicating the mechanical refrigeration evaporator and the inlet of the low-temperature water pump is closed, and

first valves

19 and 3 at the inlet and the outlet of the cold accumulation device 5 are opened, so that all prepared cold water enters the cold accumulation device 5 and is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9; or, the second valve 20, the first valve 19 and the third valve 21 are all opened to a certain state, and the water passing amount of the first valve 19 and the third valve 21 is ensured to be equal, so that part of cold water prepared by the mechanical refrigerating unit 4 enters the cold storage device 5, and part of cold water is directly supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9, the running resistance of a low-temperature circulating pipeline can be reduced, and the power consumption of the water pump is further reduced; when the commercial power is cut off and the cold accumulation device 5 needs to be cooled, the second valve 20 on the pipeline for communicating the mechanical refrigeration evaporator and the inlet of the low-temperature water pump needs to be closed, the

first valves

19 and 3 are opened, and low-temperature cold water in the cold accumulation tank is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9. When the standby power supply is normally started or the mains supply is recovered, and the cold accumulation tank needs to accumulate cold again, because the temperature of the cold accumulation tank is higher after the cold accumulation tank is cooled, when the mechanical refrigeration recovers the refrigeration, the requirement of the cold supply needs to be ensured firstly, so that a second valve 20 on a pipeline for communicating an outlet at the water side of an evaporator of the mechanical refrigeration unit 4 with an inlet of the low-temperature circulating water pump 9 needs to be opened, and the refrigeration of the low-temperature surface cooler 12 is ensured; meanwhile, the opening degree of the first valve 19 and the opening degree of the third valve 3 are adjusted, the water flow of the first valve 19 and the water flow of the third valve 21 are equal, so that a small part of cold water enters the cold accumulation tank for cold accumulation, and the system can be adjusted to a normal operation mode until the cold accumulation is finished.

As shown in fig. 6, an inlet of the low-temperature circulating water pump 9 is communicated with an outlet of the water side of the evaporator of the mechanical refrigerating unit 4, an outlet of the low-temperature circulating water pump 9 is respectively communicated with an inlet of the low-temperature surface cooler 12 and an inlet of the cold storage device 5, an outlet of the low-temperature surface cooler 12 is communicated with an inlet of the evaporator of the mechanical refrigerating unit 4, an outlet of the cold storage device 5 is communicated with an inlet of the low-temperature surface cooler 12, a first valve 19 is arranged on an inlet pipeline of the cold storage device 5, and a fourth valve 22 is arranged on a communication pipeline between the inlet of the low-temperature circulating water pump 9 and the inlet of the low-temperature surface cooler 12.

The inlet of the low-temperature water pump is communicated with the outlet of the water side of the evaporator of the mechanical refrigerating unit 4, the outlet of the low-temperature circulating water pump 9 is respectively communicated with the inlet of the low-temperature surface cooler 12 and the inlet of the cold accumulation device 5, the outlet of the low-temperature surface cooler 12 is communicated with the inlet of the water side of the evaporator of the mechanical refrigerating unit 4, and the outlet of the cold accumulation device 5 is communicated with the inlet of the low-temperature surface cooler 12; a first valve 19 is arranged on an inlet pipeline of the cold accumulation device 5, and a fourth valve 22 is arranged on a communicating pipeline of the low-temperature circulating water pump 9 and the inlet of the low-temperature surface cooler 12, and the pipeline design mainly solves the problems of cold discharge and cold accumulation of the cold accumulation device 5;

when the unit normally operates, the fourth valve 22 can be closed, the first valve 19 can be opened, so that all the prepared cold water enters the cold accumulation device 5, and then the cold water is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9; or, the

first valves

19 and 4 are both opened to a certain state, so that a part of cold water prepared by the mechanical refrigerating unit 4 enters the cold accumulation device 5, and a part of cold water is directly supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9, so that the running resistance of a low-temperature circulating pipeline can be reduced, and the power consumption of the water pump is further reduced; when the commercial power is cut off and the cold accumulation device 5 needs to be cooled, the valve IV 22 needs to be closed, the valve I19 needs to be opened, and the low-temperature cold water in the cold accumulation tank is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9. When the standby power supply is normally started or the mains supply is recovered, and the cold accumulation tank needs to accumulate cold again, because the temperature of the cold accumulation tank is higher after the cold accumulation tank is cooled, when the mechanical refrigeration is recovered, the requirement of cold supply needs to be ensured at first, and therefore the valve IV 22 needs to be opened to ensure the refrigeration of the low-temperature surface cooler 12; meanwhile, the opening degree of the first valve 19 is adjusted, so that a small part of cold water enters the cold accumulation tank for cold accumulation, and the system can be adjusted to a normal operation mode until the cold accumulation is finished.

As shown in fig. 7, an inlet of the low-temperature circulating water pump 9 is communicated with an outlet of the evaporator water side of the mechanical refrigerating unit 4, an outlet of the low-temperature circulating water pump 9 is respectively communicated with an inlet of the low-temperature surface cooler 12 and an inlet of the cold storage device 5, an outlet of the low-temperature surface cooler 12 is communicated with an inlet of the evaporator water side of the mechanical refrigerating unit 4, an outlet of the cold storage device 5 is communicated with an inlet of the low-temperature surface cooler 12, a third valve 21 is arranged on an outlet pipeline of the cold storage device 5, and a fourth valve 22 is arranged on a connecting pipeline between the inlet of the low-temperature circulating water pump 9 and the inlet of the low-temperature surface cooler 12.

The inlet of the low-temperature water pump is communicated with the outlet of the water side of the evaporator of the mechanical refrigerating unit 4, the outlet of the low-temperature circulating water pump 9 is respectively communicated with the inlet of the low-temperature surface cooler 12 and the inlet of the cold accumulation device 5, the outlet of the low-temperature surface cooler 12 is communicated with the inlet of the water side of the evaporator of the mechanical refrigerating unit 4, and the outlet of the cold accumulation device 5 is communicated with the inlet of the low-temperature surface cooler 12; a third valve 21 is arranged on an outlet pipeline of the cold accumulation device 5, and a fourth valve 22 is arranged on an inlet communicating pipeline of the low-temperature circulating water pump 9 and the low-temperature surface cooler 12, and the pipeline design mainly solves the problems of cold discharge and cold accumulation of the cold accumulation device 5;

when the unit normally operates, the valve IV 22 can be closed, the valve III 21 can be opened, so that all the prepared cold water enters the cold accumulation device 5, and then the cold water is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9; or, the valves three 21 and three 4 are both opened to a certain state, so that part of cold water prepared by the mechanical refrigerating unit 4 enters the cold accumulation device 5, and part of cold water is directly supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9, so that the running resistance of a low-temperature circulating pipeline can be reduced, and the power consumption of the water pump is further reduced; when the commercial power is cut off and the cold accumulation device 5 needs to be cooled, the valve IV 22 needs to be closed, the valve III 21 needs to be opened, and the low-temperature cold water in the cold accumulation tank is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9. When the standby power supply is normally started or the mains supply is recovered, and the cold accumulation tank needs to accumulate cold again, because the temperature of the cold accumulation tank is higher after the cold accumulation tank is cooled, when the mechanical refrigeration is recovered, the requirement of cold supply needs to be ensured at first, and therefore the valve IV 22 needs to be opened to ensure the refrigeration of the low-temperature surface cooler 12; meanwhile, the opening degree of the valve III 21 is adjusted, so that a small part of cold water enters the cold accumulation tank for cold accumulation, and the system can be adjusted to a normal operation mode until the cold accumulation is finished.

As shown in fig. 8, a first valve 19 is provided in the inlet pipe of the cold storage device 5.

A first valve 19 is arranged on an inlet pipeline of the cold accumulation device 5; after the first valve 19 is arranged, the cold accumulation device 5 can be an open cold accumulation device 5, and the opening degrees of the first valve 19 and the third valve 21 are controlled to ensure that the water inlet and outlet amounts of the cold accumulation device 5 are consistent. When the unit normally operates, the valve IV 22 can be closed, and the valves I19 and 3 at the inlet and the outlet of the cold accumulation device 5 are opened, so that all the prepared cold water enters the cold accumulation device 5 and then is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9; or, the valve four 22, the valve one 19 and the valve three 21 are all opened to a certain state, and the water passing amount of the valve one 19 and the valve three 21 is ensured to be equal, so that part of cold water prepared by the mechanical refrigerating unit 4 enters the cold storage device 5, and part of cold water is directly supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9, the running resistance of a low-temperature circulating pipeline can be reduced, and the power consumption of the water pump is further reduced; when the commercial power is cut off and the cold accumulation device 5 needs to be cooled, the valve IV 22 on the pipeline for communicating the mechanical refrigeration evaporator and the inlet of the low-temperature water pump needs to be closed, the valves I19 and 3 are opened, and the low-temperature cold water in the cold accumulation tank is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9. When the standby power supply is normally started or the mains supply is recovered, and the cold accumulation tank needs to accumulate cold again, because the temperature of the cold accumulation tank is higher after the cold accumulation tank is cooled, when the mechanical refrigeration recovers the refrigeration, the requirement of the cold supply needs to be ensured firstly, so that a valve four 22 on a pipeline for communicating an outlet at the water side of an evaporator of the mechanical refrigeration unit 4 with an inlet of the low-temperature circulating water pump 9 needs to be opened, and the refrigeration of the low-temperature surface cooler 12 is ensured; meanwhile, the opening degree of the first valve 19 and the opening degree of the third valve 3 are adjusted, the water flow of the first valve 19 and the water flow of the third valve 21 are equal, so that a small part of cold water enters the cold accumulation tank for cold accumulation, and the system can be adjusted to a normal operation mode until the cold accumulation is finished.

As shown in fig. 9, a water storage device 23 is provided above the cold storage device 5, an outlet of the water storage device 23 is connected to a water supply pipe of the circulation tank 7, and the water storage device 23 is communicated with a system water supply pipe.

A cold water storage device 23 is added above the cold accumulation device 5; the outlet of the water storage device 23 is connected with a water replenishing pipe of the circulating water tank 7, and the water storage device 23 is communicated with a system water replenishing pipe. The main function of the water storage device 23 is to ensure the normal cooling of the unit when water is cut off.

As shown in fig. 10, a water storage device 23 is provided above the cold storage device 5, an outlet of the water storage device 23 is connected to a water supply pipe of the circulation tank 7, and the water storage device 23 is communicated with a system water supply pipe.

As shown in fig. 11, a water storage device 23 is provided above the cold storage device 5, an outlet of the water storage device 23 is connected to a water supply pipe of the circulation tank 7, and the water storage device 23 is communicated with a system water supply pipe.

As shown in fig. 12, a water storage device 23 is provided above the cold storage device 5, an outlet of the water storage device 23 is connected to a water supply pipe of the circulation tank 7, and the water storage device 23 is communicated with a system water supply pipe.

As shown in fig. 13, a water storage device 23 is provided above the cold storage device 5, an outlet of the water storage device 23 is connected to a water supply pipe of the circulation tank 7, and the water storage device 23 is communicated with a system water supply pipe.

As shown in fig. 14, a water storage device 23 is provided above the cold storage device 5, an outlet of the water storage device 23 is connected to a water supply pipe of the circulation tank 7, and the water storage device 23 is communicated with a system water supply pipe.

As shown in fig. 15, a water storage device 23 is provided above the cold storage device 5, an outlet of the water storage device 23 is connected to a water supply pipe of the circulation tank 7, and the water storage device 23 is communicated with a system water supply pipe.

As shown in fig. 16, a dry cooler 26 is obliquely installed between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, the air outlet of the dry cooler 26 is communicated with the through hole arranged on the bottom surface of the exhaust box 1, a first air valve 24 is arranged on the through hole, a second air valve 25 is arranged at the air outlet of the exhaust box 1 and the evaporation refrigeration section, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

A dry cooler 26 is added to the cold source device. The dry cooler 26 is obliquely arranged at one side of the evaporation refrigeration section; the dry and cold air outlet is communicated with the exhaust box 1, and a first air valve 24 is arranged at the communication position; an air valve II 25 is also arranged at the air outlet of the air exhaust box 1 and the evaporation refrigeration section; the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of a dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigerating unit 4. The unit is additionally provided with a third operation mode: when the outdoor air temperature is low, the evaporation refrigeration section and the mechanical refrigeration unit 4 are closed and do not operate, the second air valve 25 is closed, the first air valve 24 is opened, the outdoor low-temperature air passes through the dry cooler 26 to cool the antifreeze/water in the dry cooler 26, and is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9 to take away the heat of return air.

As shown in fig. 17, a dry cooler 26 is obliquely arranged between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, the air outlet of the dry cooler 26 is communicated with an opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 is hinged on the opening, when the rotary switching air plate 27 is erected, the air outlet of the evaporation refrigeration section is closed, the opening of the exhaust box 1 is opened, the outlet of the water pipe of the low-temperature surface air cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

A dry cooler 26 is added to the cold source device. The dry cooler 26 is obliquely arranged at one side of the evaporation refrigeration section; the dry and cold air outlet is communicated with the exhaust box 1, and the dry cooler 26 and the outlet of the evaporation refrigeration section are provided with a rotary switching air plate 27; the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of a dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigerating unit 4. The unit is additionally provided with a third operation mode: when the outdoor air temperature is low, the evaporation refrigeration section and the mechanical refrigerating unit 4 are both closed and do not operate, the switching air plate 27 is rotated, the air outlet of the dry cooler 26 is opened, the air outlet of the evaporation refrigeration section is closed, outdoor low-temperature air passes through the dry cooler 26 to cool antifreeze/water in the dry cooler 26, and the antifreeze/water is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9 to take away the heat of return air.

As shown in fig. 18, a dry cooler 26 is obliquely arranged between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, the air outlet of the dry cooler 26 is communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface air cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4. A dry cooler 26 is added to the cold source device.

The dry cooler 26 is obliquely arranged at one side of the evaporation refrigeration section; the dry and cold air outlet is communicated with the exhaust box 1, and the dry cooler 26 and the outlet of the evaporation refrigeration section are provided with a rotary switching air plate 27; the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of a dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigerating unit 4. The unit is additionally provided with a third operation mode: when the outdoor air temperature is low, the evaporation refrigeration section and the mechanical refrigerating unit 4 are both closed and do not operate, the switching air plate 27 is rotated, the air outlet of the dry cooler 26 is opened, the air outlet of the evaporation refrigeration section is closed, outdoor low-temperature air passes through the dry cooler 26 to cool antifreeze/water in the dry cooler 26, and the antifreeze/water is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9 to take away the heat of return air.

As shown in fig. 19, a dry cooler 26 is obliquely arranged between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, the air outlet of the dry cooler 26 is communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface air cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 20, a dry cooler 26 is obliquely arranged between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, the air outlet of the dry cooler 26 is communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface air cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

A dry cooler 26 is added to the cold source device. The dry cooler 26 is obliquely arranged at one side of the evaporation refrigeration section; the outlet of the dry cooler 26 is communicated with the exhaust box 1, and rotary switching air plates 27 are arranged on the outlets of the dry cooler 26 and the evaporation refrigeration section; the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of a dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigerating unit 4. The unit is additionally provided with a third operation mode: when the outdoor air temperature is low, the evaporation refrigeration section and the mechanical refrigerating unit 4 are both closed and do not operate, the switching air plate 27 is rotated, the air outlet of the dry cooler 26 is opened, the air outlet of the evaporation refrigeration section is closed, outdoor low-temperature air passes through the dry cooler 26 to cool antifreeze/water in the dry cooler 26, and the antifreeze/water is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9 to take away the heat of return air.

As shown in fig. 21, a dry cooler 26 is obliquely arranged between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, the air outlet of the dry cooler 26 is communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface air cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 22, a dry cooler 26 is obliquely arranged between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, the air outlet of the dry cooler 26 is communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface air cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 23, a dry cooler 26 is obliquely arranged between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, the air outlet of the dry cooler 26 is communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 24, a dry cooler 26 is obliquely arranged between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, the air outlet of the dry cooler 26 is communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 25, two dry coolers 26 arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, V-shaped outlets of the two dry coolers 26 are communicated with an opening arranged on the bottom surface of the exhaust box 1, a first air valve 24 is arranged on the opening, a second air valve 25 is arranged at an air outlet of the exhaust box 1 and the evaporation refrigeration section, a water outlet of the low-temperature surface cooler 12 is communicated with an inlet of the dry cooler 26, and an outlet of the dry cooler 26 is communicated with an inlet of the evaporator water side of the mechanical refrigeration unit 4.

A dry cooler 26 is added to the cold source device. The dry cooler 26V is arranged on one side of the evaporation refrigeration section; the dry and cold air outlet is communicated with the exhaust box 1, and a first air valve 24 is arranged at the communication position; an air valve II 25 is also arranged at the air outlet of the air exhaust box 1 and the evaporation refrigeration section; the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of a dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigerating unit 4. The unit is additionally provided with a third operation mode: when the outdoor air temperature is low, the evaporation refrigeration section and the mechanical refrigeration unit 4 are closed and do not operate, the second air valve 25 is closed, the first air valve 24 is opened, the outdoor low-temperature air passes through the dry cooler 26 to cool the antifreeze/water in the dry cooler 26, and is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9 to take away the heat of return air.

As shown in fig. 26, two dry coolers 26 are installed between the outside of the evaporation refrigeration section and the outer end of the exhaust box 1 in a V shape, the V-shaped outlets of the two dry coolers 26 are communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 27, two dry coolers 26 are installed between the outside of the evaporation refrigeration section and the outer end of the exhaust box 1 in a V shape, the V-shaped outlets of the two dry coolers 26 are communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 28, two dry coolers 26 are installed between the outside of the evaporation refrigeration section and the outer end of the exhaust box 1 in a V shape, the V-shaped outlets of the two dry coolers 26 are communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 29, two dry coolers 26 are installed between the outside of the evaporation refrigeration section and the outer end of the exhaust box 1 in a V shape, the V-shaped outlets of the two dry coolers 26 are communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 30, two dry coolers 26 arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the exhaust box 1, the V-shaped outlets of the two dry coolers 26 are communicated with an opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 31, two dry coolers 26 are installed between the outside of the evaporation refrigeration section and the outer end of the exhaust box 1 in a V shape, the V-shaped outlets of the two dry coolers 26 are communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 32, two dry coolers 26 are installed between the outside of the evaporation refrigeration section and the outer end of the exhaust box 1 in a V shape, the V-shaped outlets of the two dry coolers 26 are communicated with the opening arranged on the bottom surface of the exhaust box 1, a rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4. A dry cooler 26 is added to the cold source device.

The dry cooler 26 is obliquely arranged at one side of the evaporation refrigeration section; the outlet of the dry cooler 26 is communicated with the exhaust box 1, and rotary switching air plates 27 are arranged on the outlets of the dry cooler 26 and the evaporation refrigeration section; the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of a dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigerating unit 4.

The unit is additionally provided with a third operation mode: when the outdoor air temperature is low, the evaporation refrigeration section and the mechanical refrigerating unit 4 are both closed and do not operate, the switching air plate 27 is rotated, the air outlet of the dry cooler 26 is opened, the air outlet of the evaporation refrigeration section is closed, outdoor low-temperature air passes through the dry cooler 26 to cool antifreeze/water in the dry cooler 26, and the antifreeze/water is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9 to take away the heat of return air.

As shown in fig. 33, two dry coolers 26 are installed between the outside of the evaporation refrigeration section and the outer end of the exhaust box 1 in a V shape, the V-shaped outlets of the two dry coolers 26 are communicated with the opening arranged on the bottom surface of the exhaust box 1, the rotary switching air plate 27 hinged on the opening is respectively matched with the opening of the exhaust box and the air outlet of the evaporation refrigeration section of the exhaust box, the outlet of the water pipe of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26, and the outlet of the dry cooler 26 is communicated with the inlet of the evaporator water side of the mechanical refrigeration unit 4.

As shown in fig. 34, the outlet of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26 and the inlet of the evaporator water side of the mechanical refrigerator group 4, and a valve is arranged on the communicating pipe.

The outlet of the low-temperature surface cooler 12 is also communicated with the inlet of the dry cooler 26 and the inlet of the evaporator water side of the mechanical refrigerating unit 4; and a valve is arranged on the communicating pipeline; when the dry cooler 26 does not operate, the valves on the inlet communication pipelines of the low-temperature surface cooler 12 and the dry cooler 26 are closed, water in the low-temperature surface cooler 12 directly enters the mechanical cooler for cooling, so that the resistance of the dry cooler 26 is reduced, the power consumption of a water pump can be reduced, and in addition, the problem that the water in the low-temperature surface cooler 12 is heated by outdoor hot air after entering the dry cooler 26 to cause the loss of cooling capacity can be avoided, the load of a system is increased, and the operation energy consumption of the system is increased; when the dry cooler 26 operates, the valves on the water side inlet communication pipelines of the low-temperature surface cooler 12 and the mechanical refrigeration evaporator are closed, the outlet water of the low-temperature surface cooler 12 enters the dry cooler 26 to be cooled, and the outlet water is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9.

As shown in fig. 35, the outlet of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26 and the inlet of the evaporator water side of the mechanical refrigerator group 4, and a valve is arranged on the communicating pipe.

As shown in fig. 36, the outlet of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26 and the inlet of the evaporator water side of the mechanical refrigerator group 4, and a valve is arranged on the communicating pipe.

The outlet of the low-temperature surface cooler 12 is respectively communicated with the inlet of the dry cooler 26 and the inlet of the evaporator water side of the mechanical refrigerating unit 4; and a valve is arranged on the communicating pipeline; when the dry cooler 26 does not operate, the valves on the inlet communication pipelines of the low-temperature surface cooler 12 and the dry cooler 26 are closed, water in the low-temperature surface cooler 12 directly enters the mechanical cooler for cooling, so that the resistance of the dry cooler 26 is reduced, the power consumption of a water pump can be reduced, and in addition, the problem that the water in the low-temperature surface cooler 12 is heated by outdoor hot air after entering the dry cooler 26 to cause the loss of cooling capacity can be avoided, the load of a system is increased, and the operation energy consumption of the system is increased; when the dry cooler 26 operates, the valves on the water side inlet communication pipelines of the low-temperature surface cooler 12 and the mechanical refrigeration evaporator are closed, the outlet water of the low-temperature surface cooler 12 enters the dry cooler 26 to be cooled, and the outlet water is supplied to the low-temperature surface cooler 12 through the low-temperature circulating water pump 9.

As shown in fig. 37, the outlet of the low-temperature surface cooler 12 is communicated with the inlet of the dry cooler 26 and the inlet of the evaporator water side of the mechanical refrigerator group 4, and a valve is arranged on the communicating pipe.

As shown in fig. 38, an upright baffle 28 is provided on the outside air intake surface of the dry cooler 26.

A baffle plate 28 is arranged on the front side of the outside air inlet of the dry cooler 26. The main function of baffle 28 is to shield snow from directly contacting the heat exchange fins of dry cooler 26 during winter operation of dry cooler 26, which affects the operation of dry cooler 26.

As shown in fig. 39, a breather valve 33 is provided at the upper portion of the cold storage device 5.

The breather valve 33 is added on the upper part of the cold accumulation device 5, and when the cold accumulation device 5 is closed, an expansion tank is needed to ensure the normal operation of the system.

As shown in fig. 40, the unit is divided into a module one 30, a module two 31 and a module three 32, or the module one 30 and the module two 31 are combined into a module, wherein the module one 30 is composed of an exhaust box 1 and a water storage device 23 which are provided with an exhaust fan 3 at an exhaust port, the module two 31 is composed of a return air box 10 with a return air port 11, and the module three 32 is composed of two dry coolers 26 which are arranged in a V shape, a cold source device which is composed of an evaporation refrigeration section, a mechanical refrigeration unit 4 and a cold accumulation device 5, two groups of composite coolers which are arranged in an inverted V shape and are arranged in an air processing chamber, and a blower 17 which is arranged in a blower box.

The unit can be divided into a first module 30, a second module 31 and a third module 32; or the first module 30 and the second module 31 can be combined into one module, and the machine is divided into two modules, namely a first module 30, a second module 31 and a third module 32; the modular design is beneficial to field installation, and can greatly reduce the field installation period, thereby shortening the construction period of the whole project.

As shown in fig. 41, the water storage device 23 is a stepped tank.

The water storage tank 29 can be designed to be trapezoidal, the volume of the water storage tank 29 is increased, and the overhaul space of the unit is not affected.

As shown in fig. 42, a water storage tank 29 is provided at the lower part of the dry cooler 26, the bottom surface of the water storage tank 29 is higher than the circulation tank 7, and a water outlet pipe of the water storage tank 29 is communicated with a water supply pipe of the circulation tank 7.

On the side part of the evaporation refrigeration section, a water storage device 23 can be added at the lower part of the dry cooler 26, and the water storage device 23 is communicated with the circulating water tank 7 for water supplement; the capacity of the water storage device 23 is increased, and when the water is supplemented and cut off by the system; the water replenishing of the system can be ensured for a longer time.

Claims

1. The utility model provides an indirect evaporative cooling air conditioning equipment of external cold type against current which characterized by: the air-conditioning system consists of a cold source device and an air treatment device, wherein the cold source device comprises an evaporation refrigeration section and a cold accumulation device (5) which are composed of a water distribution device (2), a filler (6) and a circulating water tank (7), an air exhaust box (1) provided with an exhaust fan (3) and a mechanical refrigeration unit (4), and the air treatment device comprises an air return box (10) with an air return opening (11), a high-temperature surface cooler (13), a low-temperature surface cooler (12) and a blower (17); the cold source device is characterized in that a mechanical refrigerating unit (4) is arranged at the upper part of the side of the evaporation refrigerating section, an air exhaust box (1) is arranged at the top of the evaporation refrigerating section, an inlet of the air exhaust box (1) is communicated with an air outlet of the evaporation refrigerating section, and a cold accumulation device (5) is arranged at the side part of the evaporation refrigerating section; the air return box (10) of the air treatment device is communicated with an air treatment chamber, a composite cooler is arranged in the air treatment chamber, the structure of the air treatment device is that a filter screen (14), a high-temperature surface cooler (13) and a low-temperature surface cooler (12) are sequentially arranged in parallel according to the flowing direction of air, the composite cooler divides the air treatment chamber into an air inlet chamber and an air outlet chamber, and the air outlet chamber is communicated with an air supply box provided with a blower (17); the air supply box is provided with an air supply outlet (16); a water outlet pipe of the circulating water tank (7) is communicated with an inlet of a high-temperature surface cooler (13) through a high-temperature circulating water pump (8), an outlet pipe of the circulating water tank is communicated with an inlet of a condenser water side of the mechanical refrigerating unit (4), an outlet pipe of the condenser water side of the mechanical refrigerating unit (4) is communicated with the water distribution device (2), or an outlet pipe of the high-temperature circulating water pump (8) is respectively communicated with an inlet of the high-temperature surface cooler (13) and an inlet of a condenser water side of the mechanical refrigerating unit (4), an outlet of the high-temperature surface cooler (13) and an outlet of the condenser water side of the mechanical refrigerating unit (4) are communicated with the water distribution device (2), an outlet of the cold storage device (5) is communicated with an inlet of the low-temperature surface cooler (12), an outlet pipe of the low-temperature surface cooler (12) is communicated with an inlet of an evaporator water side of the mechanical refrigerating unit (4), an outlet pipe of the evaporator water side is communicated with an inlet of the low-temperature circulating water pump (9) is arranged on a low-temperature circulating pipeline, the long water flow pipe (15) arranged on the high-temperature surface cooler (13) is connected with the circulating water tank (7).

2. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 1, wherein: an outlet pipe of the high-temperature surface cooler (13) is respectively communicated with a water side inlet of a condenser of the mechanical refrigerating unit (4) and an inlet of the water distribution device (2), a regulating valve is arranged on a pipeline communicated with the water distribution device (2), and a long condenser water flowing pipe (18) arranged on the condenser of the mechanical refrigerating unit (4) is connected with the circulating water tank (7).

3. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 2, wherein: the inlet of the low-temperature circulating water pump (9) is respectively communicated with the outlet of the cold accumulation device (5) and the outlet of the evaporator water side of the mechanical refrigerating unit (4), the outlet of the low-temperature circulating water pump (9) is communicated with the inlet of the low-temperature surface cooler (12), the outlet of the low-temperature surface cooler (12) is communicated with the inlet of the evaporator water side of the mechanical refrigerating unit (4), the outlet of the evaporator water side of the mechanical refrigerating unit (4) is respectively communicated with the inlet of the low-temperature circulating water pump (9) and the inlet of the cold accumulation device (5), a first valve (19) is arranged on an inlet pipe of the cold accumulation device (5), and a second valve (20) is arranged on a communication pipeline between the outlet of the evaporator water side of the mechanical refrigerating unit (4) and the inlet of the low-temperature circulating water pump (9).

4. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 2, wherein: the inlet of the low-temperature circulating water pump (9) is respectively communicated with the outlet of the cold accumulation device (5) and the outlet of the evaporator water side of the mechanical refrigerating unit (4), the outlet of the low-temperature circulating water pump (9) is communicated with the inlet of the low-temperature surface cooler (12), the outlet of the low-temperature circulating water pump is communicated with the inlet of the evaporator water side of the mechanical refrigerating unit (4), the outlet of the evaporator water side of the mechanical refrigerating unit (4) is respectively communicated with the inlet of the low-temperature circulating water pump (9) and the inlet of the cold accumulation device (5), a valve III (21) is arranged on the outlet pipe of the cold accumulation device (5), and a valve II (20) is arranged on the communicating pipe between the outlet of the evaporator water side of the mechanical refrigerating unit (4) and the inlet of the low-temperature circulating water pump (9).

5. The apparatus of claim 4, wherein: a first valve (19) is arranged on an inlet pipe of the cold accumulation device (5).

6. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 2, wherein: an inlet of a low-temperature circulating water pump (9) is communicated with an outlet on the water side of an evaporator of a mechanical refrigerating unit (4), an outlet of the low-temperature circulating water pump (9) is communicated with an inlet of a low-temperature surface cooler (12) and an inlet of a cold storage device (5) respectively, an outlet of the low-temperature surface cooler (12) is communicated with an inlet on the water side of the evaporator of the mechanical refrigerating unit (4), an outlet of the cold storage device (5) is communicated with an inlet of the low-temperature surface cooler (12), a first valve (19) is arranged on an inlet pipeline of the cold storage device (5), and a fourth valve (22) is arranged on a communicating pipeline between the inlet of the low-temperature circulating water pump (9) and the inlet of the low-temperature surface cooler (12).

7. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 2, wherein: the inlet of a low-temperature circulating water pump (9) is communicated with the outlet of the water side of the evaporator of the mechanical refrigerating unit (4), the outlet of the low-temperature circulating water pump (9) is communicated with the inlet of a low-temperature surface cooler (12) and the inlet of a cold storage device (5) respectively, the outlet of the low-temperature surface cooler (12) is communicated with the inlet of the water side of the evaporator of the mechanical refrigerating unit (4), the outlet of the cold storage device (5) is communicated with the inlet of the low-temperature surface cooler (12), a valve III (21) is arranged on the outlet pipeline of the cold storage device (5), and a valve IV (22) is arranged on the connecting pipeline between the inlet of the low-temperature circulating water pump (9) and the inlet of the low-temperature surface cooler (12).

8. The indirect evaporative cooling air conditioner of claim 7, wherein: a first valve (19) is arranged on an inlet pipeline of the cold accumulation device (5).

9. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 2, wherein: a water storage device (23) is arranged above the cold accumulation device (5), the outlet of the water storage device (23) is connected with a water replenishing pipe of the circulating water tank (7), and the water storage device (23) is communicated with a system water replenishing pipe.

10. The indirect evaporative cooling air conditioner of claim 3, wherein: a water storage device (23) is arranged above the cold accumulation device (5), the outlet of the water storage device (23) is connected with a water replenishing pipe of the circulating water tank (7), and the water storage device (23) is communicated with a system water replenishing pipe.

11. The apparatus of claim 4, wherein: a water storage device (23) is arranged above the cold accumulation device (5), the outlet of the water storage device (23) is connected with a water replenishing pipe of the circulating water tank (7), and the water storage device (23) is communicated with a system water replenishing pipe.

12. The indirect evaporative cooling air conditioner of claim 5, wherein: a water storage device (23) is arranged above the cold accumulation device (5), the outlet of the water storage device (23) is connected with a water replenishing pipe of the circulating water tank (7), and the water storage device (23) is communicated with a system water replenishing pipe.

13. The indirect evaporative cooling air conditioner of claim 6, wherein: a water storage device (23) is arranged above the cold accumulation device (5), the outlet of the water storage device (23) is connected with a water replenishing pipe of the circulating water tank (7), and the water storage device (23) is communicated with a system water replenishing pipe.

14. The indirect evaporative cooling air conditioner of claim 7, wherein: a water storage device (23) is arranged above the cold accumulation device (5), the outlet of the water storage device (23) is connected with a water replenishing pipe of the circulating water tank (7), and the water storage device (23) is communicated with a system water replenishing pipe.

15. The apparatus of claim 8, wherein: a water storage device (23) is arranged above the cold accumulation device (5), the outlet of the water storage device (23) is connected with a water replenishing pipe of the circulating water tank (7), and the water storage device (23) is communicated with a system water replenishing pipe.

16. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 2, wherein: the dry cooling device (26) is obliquely arranged between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), an air outlet of the dry cooling device (26) is communicated with an opening formed in the bottom surface of the air exhaust box (1), a first air valve (24) is arranged on the opening, a second air valve (25) is arranged at the air outlet of the air exhaust box (1) and the evaporation refrigeration section, a water pipe outlet of the low-temperature surface cooling device (12) is communicated with an inlet of the dry cooling device (26), and an outlet of the dry cooling device (26) is communicated with an inlet of an evaporator water side of the mechanical refrigeration unit (4).

17. The indirect evaporative cooling air conditioner of claim 3, wherein: the dry cooler (26) is obliquely arranged between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), an air outlet of the dry cooler (26) is communicated with an opening arranged on the bottom surface of the air exhaust box (1), the rotation switching air plate (27) is hinged on the opening, the air outlet of the evaporation refrigeration section is closed when the rotation switching air plate (27) is vertical, the opening of the air exhaust box (1) is opened, a water pipe outlet of the low-temperature surface air cooler (12) is communicated with an inlet of the dry cooler (26), and an outlet of the dry cooler (26) is communicated with an inlet of an evaporator water side of the mechanical refrigeration unit (4).

18. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 9, wherein: the dry cooling device (26) is obliquely arranged between the outer side of the evaporation cooling section and the outer end of the air exhaust box (1), an air outlet of the dry cooling device (26) is communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is matched with the opening of the air exhaust box and an air outlet of the evaporation cooling section of the air exhaust box respectively, a water pipe outlet of the low-temperature surface cooling device (12) is communicated with an inlet of the dry cooling device (26), and an outlet of the dry cooling device (26) is communicated with an inlet of the evaporator water side of the mechanical refrigerating unit (4).

19. The apparatus of claim 10, wherein: the dry cooling device (26) is obliquely arranged between the outer side of the evaporation cooling section and the outer end of the air exhaust box (1), an air outlet of the dry cooling device (26) is communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is matched with the opening of the air exhaust box and an air outlet of the evaporation cooling section of the air exhaust box respectively, a water pipe outlet of the low-temperature surface cooling device (12) is communicated with an inlet of the dry cooling device (26), and an outlet of the dry cooling device (26) is communicated with an inlet of the evaporator water side of the mechanical refrigerating unit (4).

20. The apparatus of claim 11, wherein: the dry cooling device (26) is obliquely arranged between the outer side of the evaporation cooling section and the outer end of the air exhaust box (1), an air outlet of the dry cooling device (26) is communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is matched with the opening of the air exhaust box and an air outlet of the evaporation cooling section of the air exhaust box respectively, a water pipe outlet of the low-temperature surface cooling device (12) is communicated with an inlet of the dry cooling device (26), and an outlet of the dry cooling device (26) is communicated with an inlet of the evaporator water side of the mechanical refrigerating unit (4).

21. The apparatus of claim 12, wherein: the dry cooling device (26) is obliquely arranged between the outer side of the evaporation cooling section and the outer end of the air exhaust box (1), an air outlet of the dry cooling device (26) is communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is matched with the opening of the air exhaust box and an air outlet of the evaporation cooling section of the air exhaust box respectively, a water pipe outlet of the low-temperature surface cooling device (12) is communicated with an inlet of the dry cooling device (26), and an outlet of the dry cooling device (26) is communicated with an inlet of the evaporator water side of the mechanical refrigerating unit (4).

22. The apparatus of claim 13, wherein: the dry cooling device (26) is obliquely arranged between the outer side of the evaporation cooling section and the outer end of the air exhaust box (1), an air outlet of the dry cooling device (26) is communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is matched with the opening of the air exhaust box and an air outlet of the evaporation cooling section of the air exhaust box respectively, a water pipe outlet of the low-temperature surface cooling device (12) is communicated with an inlet of the dry cooling device (26), and an outlet of the dry cooling device (26) is communicated with an inlet of the evaporator water side of the mechanical refrigerating unit (4).

23. The apparatus of claim 14, wherein: the dry cooling device (26) is obliquely arranged between the outer side of the evaporation cooling section and the outer end of the air exhaust box (1), an air outlet of the dry cooling device (26) is communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is matched with the opening of the air exhaust box and an air outlet of the evaporation cooling section of the air exhaust box respectively, a water pipe outlet of the low-temperature surface cooling device (12) is communicated with an inlet of the dry cooling device (26), and an outlet of the dry cooling device (26) is communicated with an inlet of the evaporator water side of the mechanical refrigerating unit (4).

24. The apparatus of claim 15, wherein: the dry cooling device (26) is obliquely arranged between the outer side of the evaporation cooling section and the outer end of the air exhaust box (1), an air outlet of the dry cooling device (26) is communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is matched with the opening of the air exhaust box and an air outlet of the evaporation cooling section of the air exhaust box respectively, a water pipe outlet of the low-temperature surface cooling device (12) is communicated with an inlet of the dry cooling device (26), and an outlet of the dry cooling device (26) is communicated with an inlet of the evaporator water side of the mechanical refrigerating unit (4).

25. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 2, wherein: two dry coolers (26) which are arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), V-shaped outlets of the two dry coolers (26) are communicated with an opening formed in the bottom surface of the air exhaust box (1), an air valve I (24) is arranged on the opening, an air valve II (25) is arranged at an air outlet of the air exhaust box (1) and the evaporation refrigeration section, a water outlet of the low-temperature surface cooler (12) is communicated with an inlet of the dry cooler (26), and an outlet of the dry cooler (26) is communicated with an inlet of the evaporator water side of the mechanical refrigeration unit (4).

26. The indirect evaporative cooling air conditioner of claim 3, wherein: two dry coolers (26) which are arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), the V-shaped outlets of the two dry coolers (26) are communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is respectively matched with the opening of the air exhaust box and an air outlet of the evaporation refrigeration section of the air exhaust box, a water pipe outlet of a low-temperature surface air cooler (12) is communicated with an inlet of the dry cooler (26), and an outlet of the dry cooler (26) is communicated with an inlet of an evaporator water side of a mechanical refrigeration unit (4).

27. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 9, wherein: two dry coolers (26) which are arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), the V-shaped outlets of the two dry coolers (26) are communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is respectively matched with the opening of the air exhaust box and an air outlet of the evaporation refrigeration section of the air exhaust box, a water pipe outlet of a low-temperature surface air cooler (12) is communicated with an inlet of the dry cooler (26), and an outlet of the dry cooler (26) is communicated with an inlet of an evaporator water side of a mechanical refrigeration unit (4).

28. The apparatus of claim 10, wherein: two dry coolers (26) which are arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), the V-shaped outlets of the two dry coolers (26) are communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is respectively matched with the opening of the air exhaust box and an air outlet of the evaporation refrigeration section of the air exhaust box, a water pipe outlet of a low-temperature surface air cooler (12) is communicated with an inlet of the dry cooler (26), and an outlet of the dry cooler (26) is communicated with an inlet of an evaporator water side of a mechanical refrigeration unit (4).

29. The apparatus of claim 11, wherein: two dry coolers (26) which are arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), the V-shaped outlets of the two dry coolers (26) are communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is respectively matched with the opening of the air exhaust box and an air outlet of the evaporation refrigeration section of the air exhaust box, a water pipe outlet of a low-temperature surface air cooler (12) is communicated with an inlet of the dry cooler (26), and an outlet of the dry cooler (26) is communicated with an inlet of an evaporator water side of a mechanical refrigeration unit (4).

30. The apparatus of claim 12, wherein: two dry coolers (26) which are arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), the V-shaped outlets of the two dry coolers (26) are communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is respectively matched with the opening of the air exhaust box and an air outlet of the evaporation refrigeration section of the air exhaust box, a water pipe outlet of a low-temperature surface air cooler (12) is communicated with an inlet of the dry cooler (26), and an outlet of the dry cooler (26) is communicated with an inlet of an evaporator water side of a mechanical refrigeration unit (4).

31. The apparatus of claim 13, wherein: two dry coolers (26) which are arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), the V-shaped outlets of the two dry coolers (26) are communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is respectively matched with the opening of the air exhaust box and an air outlet of the evaporation refrigeration section of the air exhaust box, a water pipe outlet of a low-temperature surface air cooler (12) is communicated with an inlet of the dry cooler (26), and an outlet of the dry cooler (26) is communicated with an inlet of an evaporator water side of a mechanical refrigeration unit (4).

32. The apparatus of claim 14, wherein: two dry coolers (26) which are arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), the V-shaped outlets of the two dry coolers (26) are communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is respectively matched with the opening of the air exhaust box and an air outlet of the evaporation refrigeration section of the air exhaust box, a water pipe outlet of a low-temperature surface air cooler (12) is communicated with an inlet of the dry cooler (26), and an outlet of the dry cooler (26) is communicated with an inlet of an evaporator water side of a mechanical refrigeration unit (4).

33. The apparatus of claim 15, wherein: two dry coolers (26) which are arranged in a V shape are installed between the outer side of the evaporation refrigeration section and the outer end of the air exhaust box (1), the V-shaped outlets of the two dry coolers (26) are communicated with an opening arranged on the bottom surface of the air exhaust box (1), a rotary switching air plate (27) hinged to the opening is respectively matched with the opening of the air exhaust box and an air outlet of the evaporation refrigeration section of the air exhaust box, a water pipe outlet of a low-temperature surface air cooler (12) is communicated with an inlet of the dry cooler (26), and an outlet of the dry cooler (26) is communicated with an inlet of an evaporator water side of a mechanical refrigeration unit (4).

34. The apparatus of claim 27, wherein: the outlet of the low-temperature surface cooler (12) is respectively communicated with the inlet of the dry cooler (26) and the inlet of the evaporator water side of the mechanical refrigerating unit (4), and a valve is arranged on the communicating pipe.

35. The apparatus of claim 28, wherein: the outlet of the low-temperature surface cooler (12) is respectively communicated with the inlet of the dry cooler (26) and the inlet of the evaporator water side of the mechanical refrigerating unit (4), and a valve is arranged on the communicating pipe.

36. The apparatus of claim 32, wherein: the outlet of the low-temperature surface cooler (12) is respectively communicated with the inlet of the dry cooler (26) and the inlet of the evaporator water side of the mechanical refrigerating unit (4), and a valve is arranged on the communicating pipe.

37. The apparatus of claim 33, wherein: the outlet of the low-temperature surface cooler (12) is respectively communicated with the inlet of the dry cooler (26) and the inlet of the evaporator water side of the mechanical refrigerating unit (4), and a valve is arranged on the communicating pipe.

38. The apparatus of claim 37, wherein: an upright baffle plate (28) is arranged on the air inlet surface at the outer side of the dry cooler (26).

39. The apparatus of claim 38, wherein: a breather valve (33) is provided at the upper part of the cold storage device (5).

40. The counter flow external cooling type indirect evaporative cooling air conditioning unit as claimed in claim 1 or 39, wherein: the unit is divided into a first module (30), a second module (31) and a third module (32), or the first module (30) and the second module (31) are combined into a module, wherein the first module (30) is composed of an air exhaust box (1) and a water storage device (23) which are provided with an exhaust fan (3) at an air outlet, the second module (31) is composed of an air return box (10) with an air return opening (11), and the third module (32) is composed of two dry coolers (26) which are arranged in a V shape, a cold source device which is composed of an evaporation refrigeration section, a mechanical refrigeration unit (4) and a cold accumulation device (5), two groups of composite coolers which are arranged in an inverted V shape and are arranged in an air processing chamber, and a blower (17) which is arranged in an air supply box.

41. The apparatus of claim 38, wherein: the water storage device (23) is a step-shaped water tank.

42. The apparatus of claim 41, wherein: a water storage tank (29) is arranged at the lower part of the dry cooler (26), the bottom surface of the water storage tank (29) is higher than the circulating water tank (7), and a water outlet pipe of the water storage tank (29) is communicated with a water replenishing pipe of the circulating water tank (7).