A cooling device

Abstract

The application discloses a cooling device, comprising a refrigerating device, a natural cooling device, a cold storage tank and a switching device; in a first working mode, the switching device connects a first condensing heat exchanger of the refrigerating device with the natural cooling device; in a second working mode, the switching device connects the first condensing heat exchanger with the natural cooling device, and the natural cooling device is connected with a cooling mechanism of the refrigerating device; in a third working mode, the switching device connects the natural cooling device with the cooling mechanism and the cold storage tank; and in a fourth working mode, the switching device connects the cold storage tank with the cooling mechanism. The switching device is used to realize switching of multiple modes, so that the natural cooling source is fully utilized, the energy consumption of the device is effectively reduced, the use amount of the uninterruptible power supply is reduced, an emergency system which can independently operate is arranged, and stable operation of the device is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat exchange equipment, in particular to a cooling device. BACKGROUND

[0002] In many devices, it is necessary to run in a low temperature environment, so it is necessary to be equipped with a cooling device, for example, in a data center, an air conditioning host is set up, which converts electrical energy into mechanical energy for refrigeration in a traditional way, and fails to fully utilize natural cold sources, causing waste of energy.

[0003] Further, when each component fails to normally operate, no emergency system is equipped, so that the whole cooling device stops working, and the data center cannot be cooled, affecting the normal operation of the data center.

[0004] Therefore, how to provide a cooling device which fully utilizes natural cold sources and has an emergency system is a technical problem to be solved by those skilled in the art at present. SUMMARY

[0005] The purpose of the present application is to provide a cooling device which realizes switching of multiple modes by a switching device, fully utilizes natural cold sources, effectively reduces energy consumption of the device, and is provided with an emergency system which can independently operate, so as to ensure stable operation of the device.

[0006] To solve the above technical problems, the present application provides a cooling device, comprising a refrigeration device, a natural cooling device, a cold storage tank and a switching device connecting each device.

[0007] In the first working mode, the switching device makes the first condensing heat exchanger of the refrigeration device communicate with the natural cooling device.

[0008] In the second working mode, the switching device makes the first condensing heat exchanger communicate with the natural cooling device, and the natural cooling device communicates with the cold release mechanism of the refrigeration device.

[0009] In the third working mode, the switching device makes the natural cooling device simultaneously communicate with the cold release mechanism and the cold storage tank.

[0010] In the fourth working mode, the switching device makes the cold storage tank communicate with the cold release mechanism.

[0011] Preferably, the switching device comprises a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve and a sixth control valve, the first control valve is arranged between the first condensing heat exchanger and the natural cooling device, the second control valve and the third control valve are arranged between the cold releasing mechanism and the natural cooling device in sequence, the first condensing heat exchanger is connected to a pipeline between the second control valve and the third control valve, one end of the fourth control valve is connected to the cold storage tank, the other end of the fourth control valve is connected to the pipeline between the second control valve and the third control valve, the fifth control valve is arranged between the natural cooling device and the cold storage tank, and the sixth control valve is arranged between the cold releasing mechanism and the cold storage tank.

[0012] In the first working mode, the first control valve is opened, the second control valve is closed, the third control valve is opened, the fourth control valve is closed, the fifth control valve is closed, and the sixth control valve is closed.

[0013] In the second working mode, the first control valve is opened, the second control valve is opened, the third control valve is opened, the fourth control valve is closed, the fifth control valve is closed, and the sixth control valve is closed.

[0014] In the third working mode, the first control valve is closed, the second control valve is opened, the third control valve is closed, the fourth control valve is opened, the fifth control valve is opened, and the sixth control valve is closed.

[0015] In the fourth working mode, the first control valve is closed, the second control valve is opened, the third control valve is closed, the fourth control valve is opened, the fifth control valve is closed, and the sixth control valve is opened, or the fifth control valve is opened and the sixth control valve is closed.

[0016] Preferably, the refrigeration device comprises a first compressor, the first condensing heat exchanger, a first electronic expansion valve and the cold releasing mechanism connected in sequence.

[0017] Preferably, an inner circulation inlet of the first condensing heat exchanger is connected to the first compressor, an inner circulation outlet of the first condensing heat exchanger is connected to the first electronic expansion valve, an outer circulation inlet of the first condensing heat exchanger is connected to an outlet of the natural cooling device through the third control valve, and an outer circulation outlet of the first condensing heat exchanger is connected to an inlet of the natural cooling device through the first control valve and a first circulating pump.

[0018] In the first working mode and the second working mode, the natural cooling device is opened, the first circulating pump is opened, the first compressor is opened, and the first electronic expansion valve is opened.

[0019] In the third working mode, the natural cooling device is opened, the first circulating pump is opened, the first compressor is closed, and the first electronic expansion valve is closed.

[0020] In the fourth working mode, the natural cooling device is closed, the first circulating pump is opened, the first compressor is closed, and the first electronic expansion valve is closed, or the natural cooling device is opened.

[0021] Preferably, the cooling mechanism is provided with a first coil pipe and a second coil pipe, the first coil pipe is connected with the first compressor and the first electronic expansion valve, and the second coil pipe is connected with the natural cooling device and the cold storage tank.

[0022] Preferably, the refrigeration device further comprises an evaporative heat exchanger, the evaporative heat exchanger is connected with the cooling mechanism through an inner circulation inlet and an inner circulation outlet in parallel or series, and the evaporative heat exchanger is connected with the cold storage tank through an outer circulation outlet and an outer circulation inlet; in the first working mode and the second working mode, the switching device makes the evaporative heat exchanger communicate with the cold storage tank.

[0023] Preferably, the switching device further comprises a seventh control valve and an eighth control valve, one end of the seventh control valve is connected with the refrigeration device, the other end of the seventh control valve is connected with the evaporative heat exchanger, and the eighth control valve is arranged between the evaporative heat exchanger and the cold storage tank.

[0024] In the first working mode and the second working mode, the seventh control valve is opened, and the eighth control valve is opened; in the third working mode and the fourth working mode, the seventh control valve is closed, and the eighth control valve is closed.

[0025] Preferably, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, the sixth control valve, the seventh control valve, and the eighth control valve are electric two-way valves.

[0026] Preferably, further comprising a degassing tank, an inlet of the degassing tank is connected with the cooling mechanism through a first degassing valve, and an outlet of the degassing tank is connected with the natural cooling device through a second degassing valve; in winter deaeration and water replenishment operation, the first control valve is closed, the second control valve is opened, the third control valve is closed, the fourth control valve is opened, the fifth control valve is opened, the sixth control valve is closed, the seventh control valve is closed, the eighth control valve is closed, the first degassing valve is opened, and the second degassing valve is opened.

[0027] Preferably, the upper end of the cold storage tank is provided with a cold storage automatic exhaust valve and a water replenishing electromagnetic valve, and the lower end of the cold storage tank is provided with a water draining valve; the upper end of the degassing tank is provided with a degassing automatic exhaust valve, and the lower end of the degassing tank is provided with a pressure reducing valve.

[0028] The cooling equipment provided by the application comprises a refrigeration device, a natural cooling device, a cold storage tank and a switching device connecting the devices, wherein in a first working mode, the switching device connects a first condensing heat exchanger of the refrigeration device with the natural cooling device, and the refrigeration device normally cools; in a second working mode, the switching device connects the first condensing heat exchanger with the natural cooling device, and connects the natural cooling device with a cooling mechanism of the refrigeration device, and the refrigeration device normally cools, and the natural cooling device assists the refrigeration; in a third working mode, the switching device connects the natural cooling device with the cooling mechanism and the cold storage tank, and the natural cooling device cools, and the natural cooling device stores cold in the cold storage tank; and in a fourth working mode, the switching device connects the cold storage tank with the cooling mechanism, and the cold storage tank cools.

[0029] The switching device realizes the switching of multiple modes, fully utilizes the natural cold source, effectively reduces the energy consumption of the equipment, reduces the use amount of the uninterruptible power supply, relatively improves the power ratio of the server, and can realize independent control and autonomous circulating cold storage, does not affect the efficiency of the system loop, simultaneously, the emergency system which can independently operate is arranged, and the emergency system can also be used as the supplement of the cold of the system loop, that is, a smaller capacity compressor is arranged, and only when the high load or the summer working condition occurs, the cold supplement is performed, the problem that each compressor can operate at a higher efficiency is solved, the stability of the equipment is ensured, and the problem of poor energy efficiency is solved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The structural schematic diagram of the embodiment one of the cooling equipment provided by the application;

[0031] Figure 2 The first working mode running schematic diagram of the embodiment one of the cooling equipment provided by the application;

[0032] Figure 3 The second working mode running schematic diagram of the embodiment one of the cooling equipment provided by the application;

[0033] Figure 4 The third working mode running schematic diagram of the embodiment one of the cooling equipment provided by the application;

[0034] Figure 5 The fourth working mode running schematic diagram of the embodiment one of the cooling equipment provided by the application;

[0035] Figure 6 The structural schematic diagram of the embodiment two of the cooling equipment provided by the application;

[0036] Figure 7 Structure diagram of embodiment three of the cooling equipment provided by the application;

[0037] Figure 8 Degassing and water replenishing mode operation diagram of embodiment three of the cooling equipment provided by the application.

[0038] Wherein, the first control valve 1, the second control valve 2, the third control valve 3, the fourth control valve 4, the fifth control valve 5, the sixth control valve 6, the seventh control valve 7, the eighth control valve 8, the natural cooling device 9, the cold storage tank 10, the first compressor 11, the first condensing heat exchanger 12, the first electronic expansion valve 13, the cooling mechanism 14, the second compressor 15, the second condensing heat exchanger 16, the second electronic expansion valve 17, the evaporating heat exchanger 18, the first circulating pump 19, the second circulating pump 20, the pressure switch 21, the fluorine injection nozzle 22, the drying filter 23, the sight glass 24, the temperature sensor 25, the pressure sensor 26, the degassing tank 27, the first degassing valve 28, the second degassing valve 29, the cold storage automatic exhaust valve 30, the water replenishing electromagnetic valve 31, the drainage valve 32, the degassing automatic exhaust valve 33, the pressure reducing valve 34, and the electric three-way valve 35. DETAILED DESCRIPTION

[0039] The core of the application is to provide a cooling equipment, which realizes the switching of multiple modes through a switching device, fully utilizes the natural cold source, effectively reduces the energy consumption of the equipment, and is provided with an emergency system capable of independent operation, thereby ensuring the stable operation of the equipment.

[0040] In order to enable the personnel in the technical field to better understand the application scheme, the application will be further described in detail below in combination with the drawings and specific embodiments.

[0041] Please refer to Figure 1 , Figure 1 Structure diagram of embodiment one of the cooling equipment provided by the application.

[0042] The specific embodiment of the application provides a cooling equipment, which comprises a refrigeration device, a natural cooling device 9, a cold storage tank 10, and a switching device connected with each device. Wherein, the refrigeration device comprises a first compressor 11, a first condensing heat exchanger 12, a first electronic expansion valve 13, and a cooling mechanism 14 connected in series. The cooling medium circulates in the refrigeration device in the above order. The first condensing heat exchanger 12 is connected with the natural cooling device 9. After the first compressor 11 is started, the cooling medium circulates in the refrigeration device. At the first condensing heat exchanger 12, the heat of the cooling medium in the refrigeration device is exchanged to the cooling medium in the natural cooling device 9. Then, the cooled cooling medium in the refrigeration device reaches the cooling mechanism 14 to cool the target.

[0043] Further, in order to realize heat exchange of different cooling media, a plate exchange structure can be used, each heat exchanger is provided with an inner circulation inlet and an inner circulation outlet for connecting the compressor and the electronic expansion valve, and each heat exchanger is provided with an outer circulation inlet and an outer circulation outlet for connecting the natural cooling device 9.

[0044] Specifically, the inner circulation inlet of the first condensing heat exchanger 12 is connected to the first compressor 11, the inner circulation outlet of the first condensing heat exchanger 12 is connected to the first electronic expansion valve 13, the outer circulation inlet of the first condensing heat exchanger 12 is connected to the outlet of the natural cooling device 9, the outer circulation outlet of the first condensing heat exchanger 12 is connected to the inlet of the natural cooling device 9, the cold release inlet of the cold storage tank 10 is connected to the cold release mechanism 14, and the cold release outlet of the cold storage tank 10 is connected to the cold release mechanism 14.

[0045] The cold release mechanism 14 is provided with a first coil pipe and a second coil pipe, different coil pipes correspond to different media respectively, the first coil pipe connected to the compressor is a fluorine cooling coil pipe, and the second coil pipe connected to the natural cooling device 9 or the cold storage tank 10 is a water cooling or water mixed liquid coil pipe, the first coil pipe is connected to the first compressor 11 and the first electronic expansion valve 13, and the indoor refrigeration device releases cold through the first coil pipe after refrigeration, the second coil pipe is connected to the natural cooling device 9 and the cold storage tank 10, and the cold energy of the natural cooling device 9 and the cold storage tank 10 is released through the second coil pipe. Among them, in order to cool the target, a plurality of cold release modes can be used, such as directly setting a fan outside the cold release mechanism 14 to blow cold air to the target, and of course other cold release modes can also be used, such as the cold release mechanism 14 also serving as a heat exchange structure, and corresponding heat exchange pipelines are provided for the target.

[0046] The switching device realizes switching of multiple modes, fully utilizes the natural cold source, effectively reduces the energy consumption of the equipment, reduces the use amount of the uninterruptible power supply, relatively improves the server power ratio, and can realize independent control and autonomous circulating cold storage, which not only does not affect the efficiency of the system loop, but also sets an emergency system that can be independently operated and can be used as a supplement of the cold energy of the system loop, that is, a smaller capacity compressor is configured, and only when the high load or summer working condition occurs, the cold energy is supplemented, so that each compressor can operate at a higher efficiency, solves the problem of poor energy efficiency, and ensures stable operation of the equipment.

[0047] According to the change of the external environment temperature, multiple working modes can be set, the first working mode is used to cope with the high-temperature environment in summer, the second working mode is used to cope with the environment in the transition season, the third working mode is used to cope with the low-temperature environment in winter, and the fourth working mode is an emergency mode.

[0048] In the first working mode, the refrigeration device normally refrigerates and cools the target through the cold release mechanism 14, the switching device connects the first condensing heat exchanger 12 of the refrigeration device to the natural cooling device 9, and the refrigeration device and the natural cooling device 9 normally start to work.

[0049] In the second working mode, the refrigeration device and the natural cooling device 9 normally refrigerate and cool the target through the cooling release mechanism 14, the switching device connects the first condenser heat exchanger 12 with the natural cooling device 9, and the natural cooling device 9 is connected with the cooling release mechanism 14 of the refrigeration device, and the indoor refrigeration device and the natural cooling device 9 are normally started to work.

[0050] In the third working mode, the natural cooling device 9 refrigerates and cools the target through the cooling release mechanism 14, and at the same time, the natural cooling device 9 stores cold in the cold storage tank 10, the switching device connects the natural cooling device 9 with the cooling release mechanism 14 and the cold storage tank 10, and the indoor refrigeration device and the natural cooling device 9 stop working.

[0051] In the fourth working mode, the cold in the cold storage tank 10 is delivered to the cooling release mechanism 14, the switching device connects the cold storage tank 10 with the cooling release mechanism 14, and the refrigeration device and the natural cooling device 9 stop working.

[0052] Please refer to Figures 2 to 5 , Figure 2 The first working mode running schematic diagram of the cooling device of the embodiment one provided by the application; Figure 3 The second working mode running schematic diagram of the cooling device of the embodiment one provided by the application; Figure 4 The third working mode running schematic diagram of the cooling device of the embodiment one provided by the application; Figure 5 The fourth working mode running schematic diagram of the cooling device of the embodiment one provided by the application.

[0053] In the cooling device provided in the specific embodiment of the application, mode switching can be realized in various ways, the switching device includes a first control valve 1, a second control valve 2, a third control valve 3, a fourth control valve 4, a fifth control valve 5 and a sixth control valve 6, preferably, each control valve is an electric two-way valve, that is, a simple on-off valve, when the control valve is opened, the pipeline is connected, and when the control valve is closed, the pipeline is disconnected, each valve is controlled independently, the structure is simplified, and the maintenance and replacement are facilitated, of course, a multi-position multi-way reversing valve can also be used, and mode switching can be realized by using fewer valves.

[0054] Specifically, the first control valve 1 is arranged between the first condensing heat exchanger 12 and the natural cooling device 9, one end of the first control valve 1 is connected to the outer circulation outlet of the first condensing heat exchanger 12, and the other end of the first control valve 1 is connected to the inlet of the natural cooling device 9; the second control valve 2 and the third control valve 3 are arranged between the cold-bleed mechanism 14 and the natural cooling device 9 in sequence, and the first condensing heat exchanger 12 is connected to the pipeline between the second control valve 2 and the third control valve 3; one end of the second control valve 2 is connected to the second coil pipe of the cold-bleed mechanism 14, and the other end of the second control valve 2 is divided into three paths, the first path is connected to the outer circulation inlet of the first condensing heat exchanger 12, the second path is connected to the outer circulation inlet of the second condensing heat exchanger 16, and the third path is connected to the third control valve 3; the third control valve 3 is connected to the outlet of the natural cooling device 9; one end of the fourth control valve 4 is connected to the cold-bleed outlet of the cold storage tank 10, and the other end of the fourth control valve 4 is connected to the pipeline between the second control valve 2 and the third control valve 3; the fifth control valve 5 is arranged between the natural cooling device 9 and the cold storage tank 10; the pipeline leading out of the outlet of the natural cooling device 9 is divided into two paths, one path is connected to the third control valve 3 as described above, and the other path is connected to one end of the fifth control valve 5; the other end of the fifth control valve 5 is connected to the cold-bleed inlet of the cold storage tank 10; the sixth control valve 6 is arranged between the cold-bleed mechanism 14 and the cold storage tank 10, one end of the sixth control valve 6 is connected to the second coil pipe of the cold-bleed mechanism 14, and the other end of the sixth control valve 6 is connected to the cold-bleed inlet of the cold storage tank 10.

[0055] Further, the inner circulation inlet of the first condensing heat exchanger 12 is connected to the first compressor 11, the inner circulation outlet of the first condensing heat exchanger 12 is connected to the first electronic expansion valve 13, the outer circulation inlet of the first condensing heat exchanger 12 is connected to the outlet of the natural cooling device 9 through the third control valve 3, and the outer circulation outlet of the first condensing heat exchanger 12 is connected to the inlet of the natural cooling device 9 through the first control valve 1 and the first circulation pump 19.

[0056] In the first working mode, the system is operated in a high-temperature environment in summer, and single-coil-pipe refrigeration is realized; the first control valve 1 is opened, the second control valve 2 is closed, the third control valve 3 is opened, the fourth control valve 4 is closed, the fifth control valve 5 is closed, the sixth control valve 6 is closed, the natural cooling device 9 is opened, the first circulation pump 19 is opened, the first compressor 11 is opened, and the first electronic expansion valve 13 is opened.

[0057] In the working process, the refrigeration device is started, the first compressor 11 drives the cooling medium to flow through the first condensing heat exchanger 12, the first electronic expansion valve 13, the first coil of the cooling mechanism 14, and then flow back to the first compressor 11, wherein the cooling medium is cooled in the first condensing heat exchanger 12, and after passing through the first electronic expansion valve 13, the low-temperature cooling medium is cooled to the target through the cooling mechanism 14. More importantly, the first circulating pump 19 and the natural cooling device 9 are started, the cooling medium cooled by natural cooling in the natural cooling device 9 is output from the outlet, passes through the third control valve 3, and then enters the outer circulation inlet of the first condensing heat exchanger 12, and after heat exchange, is output from the outer circulation outlet of the first condensing heat exchanger 12, passes through the first control valve 1 and the first circulating pump 19, and flows back to the inlet of the natural cooling device 9. Only the first coil is cooled, and the indoor refrigeration device is used to cool the first coil.

[0058] In the second working mode, the transition season is operated, if the outdoor environment temperature is lower than the preset temperature of the indoor return air temperature in the transition season, the two coils are cooled together, the natural cooling source is fully utilized, the first control valve 1 is opened, the second control valve 2 is opened, the third control valve 3 is opened, the fourth control valve 4 is closed, the fifth control valve 5 is closed, the sixth control valve 6 is closed, the natural cooling device 9 is opened, the first circulating pump 19 is opened, the first compressor 11 is opened, and the first electronic expansion valve 13 is opened.

[0059] In the working process, the refrigeration device is started, the first compressor 11 drives the cooling medium to flow through the first condensing heat exchanger 12, the first electronic expansion valve 13, the first coil of the cooling mechanism 14, and then flow back to the first compressor 11, wherein the cooling medium is cooled in the first condensing heat exchanger 12, and after passing through the first electronic expansion valve 13, the low-temperature cooling medium is cooled to the target through the cooling mechanism 14. More importantly, the first circulating pump 19 and the natural cooling device 9 are started, the cooling medium cooled by natural cooling in the natural cooling device 9 is output from the outlet, passes through the third control valve 3, and then is divided into two paths, the first path enters the outer circulation inlet of the first condensing heat exchanger 12, and after heat exchange, is output from the outer circulation outlet of the first condensing heat exchanger 12, passes through the first control valve 1 and the first circulating pump 19, and flows back to the inlet of the natural cooling device 9, and the second path enters the second coil of the cooling mechanism 14, and then flows back to the inlet of the natural cooling device 9 through the first circulating pump 19. The first coil and the second coil are cooled together, the indoor refrigeration device is used to cool the first coil, and the natural cooling device 9 is used to cool the second coil.

[0060] In the third working mode, the single coil is cooled in the winter low-temperature environment, the natural cooling source is fully utilized, and the cold storage tank 10 is also in the cold storage mode, the first control valve 1 is closed, the second control valve 2 is opened, the third control valve 3 is closed, the fourth control valve 4 is opened, the fifth control valve 5 is opened, the sixth control valve 6 is closed, the natural cooling device 9 is opened, the first circulating pump 19 is opened, the first compressor 11 is closed, and the first electronic expansion valve 13 is closed.

[0061] In the working process, the refrigeration device stops working, the first circulating pump 19 and the natural cooling device 9 start working, the cooling medium cooled by the natural cooling device 9 is output from the outlet, and then sequentially passes through the fifth control valve 5, the cold storage tank 10, the fourth control valve 4, the second control valve 2, the second coil pipe, and the first circulating pump 19 and flows back to the inlet of the natural cooling device 9. The second coil pipe is cooled, the natural cooling device 9 cools the second coil pipe, and the cold storage tank 10 stores cold, and the natural cooling device 9 cools the cold storage tank 10.

[0062] In the fourth working mode, emergency operation, single coil pipe refrigeration, isolation of natural cooling, the first control valve 1 is closed, the second control valve 2 is opened, the third control valve 3 is closed, the fourth control valve 4 is opened, the fifth control valve 5 is closed, the sixth control valve 6 is opened, the natural cooling device 9 is closed, the first circulating pump 19 is opened, and the first compressor 11 is closed.

[0063] In the working process, the refrigeration device and the natural cooling device 9 stop working, the first circulating pump 19 starts working, the cooling medium stored in the cold storage tank 10 flows out, sequentially passes through the fourth control valve 4, the second control valve 2, the second coil pipe, the first circulating pump 19 and the sixth control valve 6 and flows back to the cold storage tank 10, the second coil pipe is cooled, the cold storage tank 10 cools the second coil pipe, and in the emergency mode, the high-temperature stored water in the natural cooling device 9 is isolated.

[0064] Further, the emergency mode can be further subdivided according to the difference of the environmental temperature in different seasons. In summer, the temperature of the natural cooling device 9 is relatively high, in order to avoid bringing higher heat, the working mode of each component is as shown above, the natural cooling device 9 is isolated, and most importantly, the first control valve 6 is opened, and the fifth control valve 5 and the third control valve 3 are closed.

[0065] In winter, the first control valve 6 is closed, the fifth control valve 5 is opened, and the third control valve 3 is closed, and at the same time, the natural cooling device 9 meets the low-temperature requirement, the natural cooling device 9 is opened, and the natural cooling can be used for a long time to supplement cold.

[0066] In the transition season, the natural cooling device 9 is switched according to the temperature, when the natural cooling device 9 meets the low-temperature requirement, the winter mode of the above-mentioned emergency mode is adopted, and when the natural cooling device 9 does not meet the low-temperature requirement, the summer mode of the above-mentioned emergency mode is adopted, and the two modes are switched constantly to fully utilize the natural cooling.

[0067] Please refer to Figure 6 , Figure 6 The structural schematic diagram of the embodiment two of the cooling device provided by the application.

[0068] In order to realize automatic cold storage, the refrigeration device further comprises an evaporative heat exchanger 18, which is connected to the cooling mechanism 14 in parallel or series through an inner circulation inlet and an inner circulation outlet, and is connected to the cold storage tank 10 through an outer circulation outlet and an outer circulation inlet. The cooling medium in the refrigeration device is cooled at the cooling mechanism 14 and the evaporative heat exchanger 18, and is used to cool the target and exchange heat with the cooling medium in the cold storage tank 10, so as to store cold in the cold storage tank 10. Preferably, the evaporative heat exchanger 18 is connected to the cooling mechanism 14 in parallel, the inner circulation inlet of the evaporative heat exchanger 18 is connected to the inlet of the first coil, the inner circulation outlet of the evaporative heat exchanger 18 is connected to the outlet of the first coil, the outer circulation inlet of the evaporative heat exchanger 18 is connected to the cold storage outlet of the cold storage tank 10 through the second circulation pump 20, the outer circulation outlet of the evaporative heat exchanger 18 is connected to the cold storage inlet of the cold storage tank 10, the cold storage inlet of the cold storage tank 10 is connected to the cooling mechanism 14, and the cold storage outlet of the cold storage tank 10 is connected to the cooling mechanism 14. In the first working mode and the second working mode, the switching device connects the evaporative heat exchanger 18 to the cold storage tank 10, and the other connection modes refer to the first embodiment.

[0069] The switching device further comprises a seventh control valve (7) and an eighth control valve (8), one end of the seventh control valve (7) is connected to the refrigeration device, the other end of the seventh control valve (7) is connected to the evaporative heat exchanger (18), the eighth control valve (8) is arranged between the evaporative heat exchanger (18) and the cold storage tank (10), the seventh control valve (7) is opened and the eighth control valve (8) is opened in the first working mode and the second working mode; the seventh control valve (7) is closed and the eighth control valve (8) is closed in the third working mode and the fourth working mode, and the opening and closing modes of the other valves refer to the first embodiment.

[0070] Please refer to Figure 7 , Figure 7 The structure diagram of the third embodiment of the cooling device provided by the application.

[0071] The embodiment of the present application provides a cooling device, and the refrigerating device comprises indoor refrigerating device and cold storage refrigerating device arranged separately, and the cold storage refrigerating device comprises a cold storage tank 10. Wherein, the indoor refrigerating device comprises a first compressor 11, a first condensing heat exchanger 12, a first electronic expansion valve 13 and a cooling release mechanism 14 connected in series, and cooling medium circulates in the indoor refrigerating device in the above order; the first condensing heat exchanger 12 is connected with a natural cooling device 9; after the first compressor 11 is started, the cooling medium circulates in the indoor refrigerating device, and at the first condensing heat exchanger 12, the heat of the cooling medium in the indoor refrigerating device is exchanged to the cooling medium in the natural cooling device 9, and then the cooled cooling medium in the indoor refrigerating device reaches the cooling release mechanism 14 to cool the target. In addition, the cold storage refrigerating device comprises a second compressor 15, a second condensing heat exchanger 16, a second electronic expansion valve 17 and an evaporating heat exchanger 18 connected in series, and the cooling medium circulates in the cold storage refrigerating device in the above order; the second condensing heat exchanger 16 is connected with the natural cooling device 9. After the second compressor 15 is started, the cooling medium circulates in the cold storage refrigerating device, and at the second condensing heat exchanger 16, the heat of the cooling medium in the cold storage refrigerating device is exchanged to the cooling medium in the natural cooling device 9, and then the cooled cooling medium in the cold storage refrigerating device reaches the evaporating heat exchanger 18 to exchange heat with the cooling medium in the cold storage tank 10, and the cold storage tank 10 is cooled.

[0072] Specifically, the inner circulation inlet of the first condensing heat exchanger 12 is connected with the first compressor 11, the inner circulation outlet of the first condensing heat exchanger 12 is connected with the first electronic expansion valve 13, the outer circulation inlet of the first condensing heat exchanger 12 is connected with the outlet of the natural cooling device 9, the outer circulation outlet of the first condensing heat exchanger 12 is connected with the inlet of the natural cooling device 9; the inner circulation inlet of the second condensing heat exchanger 16 is connected with the second compressor 15, the inner circulation outlet of the second condensing heat exchanger 16 is connected with the second electronic expansion valve 17, the outer circulation inlet of the second condensing heat exchanger 16 is connected with the outlet of the natural cooling device 9, and the outer circulation outlet of the second condensing heat exchanger 16 is connected with the inlet of the natural cooling device 9; the inner circulation inlet of the evaporating heat exchanger 18 is connected with the second electronic expansion valve 17, the inner circulation outlet of the evaporating heat exchanger 18 is connected with the second compressor 15, the outer circulation inlet of the evaporating heat exchanger 18 is connected with the cold storage outlet of the cold storage tank 10 through the second circulation pump 20, the outer circulation outlet of the evaporating heat exchanger 18 is connected with the cold storage inlet of the cold storage tank 10, the cooling release inlet of the cold storage tank 10 is connected with the cooling release mechanism 14, and the cooling release outlet of the cold storage tank 10 is connected with the cooling release mechanism 14.

[0073] In order to ensure the stable operation of the equipment, the indoor refrigeration device and the cold storage refrigeration device each comprise a pressure switch 21, a fluorine injection nozzle 22, a drying filter 23, a sight glass 24, a temperature sensor 25 and a pressure sensor 26. Further, the natural cooling device 9 is arranged outdoors and comprises a dry coil, so as to make full use of the natural cooling source. Other types of natural cooling modes can also be arranged and are within the protection scope of the present application.

[0074] According to the change of the ambient temperature, a plurality of working modes can be set. The first working mode is used to cope with the high-temperature environment in summer, the second working mode is used to cope with the environment in the transition season, the third working mode is used to cope with the low-temperature environment in winter, and the fourth working mode is an emergency mode.

[0075] In the first working mode, the indoor refrigeration device normally refrigerates and cools the target through the cooling release mechanism 14, and the cold storage refrigeration device stores cold into the cold storage tank 10. The switching device makes the first condensing heat exchanger 12 of the indoor refrigeration device and the second condensing heat exchanger 16 of the cold storage refrigeration device both communicate with the natural cooling device 9, and the evaporating heat exchanger 18 of the cold storage refrigeration device communicates with the cold storage tank 10. The indoor refrigeration device, the natural cooling device 9 and the cold storage refrigeration device all normally start to work.

[0076] In the second working mode, the indoor refrigeration device normally refrigerates and cools the target through the cooling release mechanism 14, and the natural cooling device 9 assists in refrigeration and cools the target through the cooling release mechanism 14. Meanwhile, the cold storage refrigeration device stores cold into the cold storage tank 10. The switching device makes the first condensing heat exchanger 12 and the second condensing heat exchanger 16 both communicate with the natural cooling device 9, and the evaporating heat exchanger 18 communicates with the cold storage tank 10. The natural cooling device 9 communicates with the cooling release mechanism 14 of the indoor refrigeration device. The indoor refrigeration device, the natural cooling device 9 and the cold storage refrigeration device all normally start to work.

[0077] In the third working mode, the natural cooling device 9 refrigerates and cools the target through the cooling release mechanism 14, and the natural cooling device 9 stores cold into the cold storage tank 10. The switching device makes the natural cooling device 9 simultaneously communicate with the cooling release mechanism 14 and the cold storage tank 10. The indoor refrigeration device and the natural cooling device 9 stop to work, and the cold storage refrigeration device normally starts to work.

[0078] In the fourth working mode, the cold in the cold storage tank 10 is delivered to the cooling release mechanism 14. The switching device makes the cold storage tank 10 communicate with the cooling release mechanism 14. The indoor refrigeration device, the natural cooling device 9 and the cold storage refrigeration device all stop to work.

[0079] In the cooling device provided in the detailed description of the present application, the mode switching can be achieved in various ways. The switching device comprises a first control valve 1, a second control valve 2, a third control valve 3, a fourth control valve 4, a fifth control valve 5, a seventh control valve 7, a sixth control valve 6 and an eighth control valve 8. Preferably, each control valve is an electric two-way valve, i.e. a simple on-off valve. When the control valve is opened, the pipeline connected thereto is connected; when the control valve is closed, the pipeline connected thereto is disconnected. Each valve is controlled independently, which simplifies the structure and facilitates maintenance and replacement. Of course, a multi-position multi-way reversing valve can also be used to achieve mode switching with fewer valves.

[0080] Specifically, the first control valve 1 is arranged between the first condensing heat exchanger 12 and the natural cooling device 9. One end of the first control valve 1 is connected to the external circulation outlet of the first condensing heat exchanger 12, and the other end of the first control valve 1 is connected to the inlet of the natural cooling device 9. The second control valve 2 and the third control valve 3 are arranged in sequence between the cold release mechanism 14 and the natural cooling device 9. The first condensing heat exchanger 12 is connected to the pipeline between the second control valve 2 and the third control valve 3. One end of the second control valve 2 is connected to the second coil of the cold release mechanism 14. The other end of the second control valve 2 is divided into three branches. The first branch is connected to the external circulation inlet of the first condensing heat exchanger 12. The second branch is connected to the external circulation inlet of the second condensing heat exchanger 16. The third branch is connected to the third control valve 3. The third control valve 3 is connected to the outlet of the natural cooling device 9. One end of the fourth control valve 4 is connected to the cold release outlet of the cold storage tank 10. The other end of the fourth control valve 4 is connected to the pipeline between the second control valve 2 and the third control valve 3. The fifth control valve 5 is arranged between the natural cooling device 9 and the cold storage tank 10. The pipeline leading from the outlet of the natural cooling device 9 is divided into two branches. One branch is connected to the third control valve 3 as described above. The other branch is connected to one end of the fifth control valve 5. The other end of the fifth control valve 5 is connected to the cold release inlet of the cold storage tank 10. The seventh control valve 7 is arranged between the second condensing heat exchanger 16 and the natural cooling device 9. One end of the seventh control valve 7 is connected to the external circulation outlet of the second condensing heat exchanger 16. The pipeline leading from the other end of the seventh control valve 7 is divided into two branches. One branch is connected to the second coil of the cold release mechanism 14. The other branch is connected to the inlet of the natural cooling device 9. The sixth control valve 6 is arranged between the cold release mechanism 14 and the cold storage tank 10. One end of the sixth control valve 6 is connected to the second coil of the cold release mechanism 14. The other end of the sixth control valve 6 is connected to the cold release inlet of the cold storage tank 10. The eighth control valve 8 is arranged between the evaporating heat exchanger 18 and the cold storage tank 10. One end of the eighth control valve 8 is connected to the cold storage outlet of the evaporating heat exchanger 18. The other end of the eighth control valve 8 is connected to the cold storage inlet of the cold storage tank 10.

[0081] Further, the inner circulation inlet of the first condensing heat exchanger 12 is connected to the first compressor 11, the inner circulation outlet of the first condensing heat exchanger 12 is connected to the first electronic expansion valve 13, the outer circulation inlet of the first condensing heat exchanger 12 is connected to the outlet of the natural cooling device 9 through the third control valve 3, and the outer circulation outlet of the first condensing heat exchanger 12 is connected to the inlet of the natural cooling device 9 through the first control valve 1 and the first circulation pump 19.

[0082] The inner circulation inlet of the second condensing heat exchanger 16 is connected to the second compressor 15, the inner circulation outlet of the second condensing heat exchanger 16 is connected to the second electronic expansion valve 17, the outer circulation inlet of the second condensing heat exchanger 16 is connected to the outlet of the natural cooling device 9 through the third control valve 3, and the outer circulation outlet of the second condensing heat exchanger 16 is connected to the inlet of the natural cooling device 9 through the seventh control valve 7 and the first circulation pump 19.

[0083] The inner circulation inlet of the evaporating heat exchanger 18 is connected to the second electronic expansion valve 17, the inner circulation outlet of the evaporating heat exchanger 18 is connected to the second compressor 15, the outer circulation inlet of the evaporating heat exchanger 18 is connected to the cold storage outlet of the cold storage tank 10 through the second circulation pump 20, the outer circulation outlet of the evaporating heat exchanger 18 is connected to the cold storage inlet of the cold storage tank 10 through the eighth control valve 8, the cold release inlet of the cold storage pipe is connected to the cold release mechanism 14 through the sixth control valve 6 and the first circulation pump 19, and the cold release outlet of the evaporating heat exchanger 18 is connected to the cold release mechanism 14 through the fourth control valve 4 and the second control valve 2.

[0084] In the first working mode, the single-coil-pipe refrigeration is operated in a high-temperature environment in summer, the first control valve 1 is opened, the second control valve 2 is closed, the third control valve 3 is opened, the fourth control valve 4 is closed, the fifth control valve 5 is closed, the seventh control valve 7 is opened, the sixth control valve 6 is closed, the eighth control valve 8 is opened, the natural cooling device 9 is opened, the first circulation pump 19 is opened, the first compressor 11 is opened, the first electronic expansion valve 13 is opened, the second circulation pump 20 is opened, the second compressor 15 is opened, and the second electronic expansion valve 17 is opened.

[0085] In the working process, the indoor refrigeration device is started, the first compressor 11 drives the cooling medium to flow through the first condensing heat exchanger 12, the first electronic expansion valve 13, the first coil of the cooling device 14, and then flow back to the first compressor 11, wherein the cooling medium is cooled in the first condensing heat exchanger 12, and after passing through the first electronic expansion valve 13, the low-temperature cooling medium is cooled to the target through the cooling device 14. At the same time, the cold storage refrigeration device is started, the second compressor 15 drives the cooling medium to flow through the second condensing heat exchanger 16, the second electronic expansion valve 17, the evaporating heat exchanger 18, and then flow back to the second compressor 15, wherein the cooling medium is cooled in the second condensing heat exchanger 16, and after passing through the second electronic expansion valve 17, the low-temperature cooling medium is cooled in the evaporating heat exchanger 18 to cool and store the medium in the cold storage tank 10, the second circulating pump 20 is started to deliver the cooling medium in the cold storage tank 10 to the evaporating heat exchanger 18, and then deliver it back to the cold storage tank 10 through the eighth control valve 8. More importantly, the first circulating pump 19 and the natural cooling device 9 are started, the cooling medium cooled by natural cooling in the natural cooling device 9 is output from the outlet, passes through the third control valve 3, and then is divided into two paths, one path enters the outer circulation inlet of the first condensing heat exchanger 12, completes heat exchange, and then flows back to the inlet of the natural cooling device 9 through the first control valve 1 and the first circulating pump 19, and the other path enters the outer circulation inlet of the second condensing heat exchanger 16, completes heat exchange, and then flows back to the inlet of the natural cooling device 9 through the seventh control valve 7 and the first circulating pump 19. Only the first coil is cooled, the indoor refrigeration device is used to cool the first coil, and the cold storage tank 10 stores cold, and the energy storage refrigeration device is used to cool the cold storage tank 10.

[0086] In the second working mode, the transition season is operated, if the outdoor environment temperature is lower than the indoor return air temperature preset temperature in the transition season, the two coils are cooled together, the natural cold source is fully utilized, the first control valve 1 is opened, the second control valve 2 is opened, the third control valve 3 is opened, the fourth control valve 4 is closed, the fifth control valve 5 is closed, the seventh control valve 7 is opened, the sixth control valve 6 is closed, the eighth control valve 8 is opened, the natural cooling device 9 is opened, the first circulating pump 19 is opened, the first compressor 11 is opened, the first electronic expansion valve 13 is opened, the second circulating pump 20 is opened, the second compressor 15 is opened, and the second electronic expansion valve 17 is opened.

[0087] In the working process, the indoor refrigeration device is started, the first compressor 11 drives the cooling medium to flow through the first condensing heat exchanger 12, the first electronic expansion valve 13, the first coil of the cooling device, and then flow back to the first compressor 11, wherein the cooling medium is cooled in the first condensing heat exchanger 12, and after passing through the first electronic expansion valve 13, the low-temperature cooling medium is cooled to the target through the cooling device. At the same time, the cold storage refrigeration device is started, the second compressor 15 drives the cooling medium to flow through the second condensing heat exchanger 16, the second electronic expansion valve 17, the evaporating heat exchanger 18, and then flow back to the second compressor 15, wherein the cooling medium is cooled in the second condensing heat exchanger 16, and after passing through the second electronic expansion valve 17, the low-temperature cooling medium is cooled in the evaporating heat exchanger 18 to cool and store the medium in the cold storage tank 10, the second circulating pump 20 is started to transport the cooling medium in the cold storage tank 10 to the evaporating heat exchanger 18, and then transport it back to the cold storage tank 10 through the eighth control valve 8. More importantly, the first circulating pump 19 and the natural cooling device 9 are started, the cooling medium cooled by natural cooling in the natural cooling device 9 is output from the outlet, passes through the third control valve 3, and then is divided into three paths, the first path enters the outer circulation inlet of the first condensing heat exchanger 12, completes heat exchange, and then flows back to the inlet of the natural cooling device 9 through the first control valve 1 and the first circulating pump 19, the second path enters the outer circulation inlet of the second condensing heat exchanger 16, completes heat exchange, and then flows back to the inlet of the natural cooling device 9 through the seventh control valve 7 and the first circulating pump 19, and the third path enters the second coil of the cooling device, and then flows back to the inlet of the natural cooling device 9 through the first circulating pump 19. The first coil and the second coil are cooled together, the indoor refrigeration device cools the first coil, the natural cooling device 9 cools the second coil, and the cold storage tank 10 stores cold, and since the energy storage refrigeration device cools the cold storage tank 10.

[0088] In the third working mode, the single-coil refrigeration is operated in the winter low-temperature environment, completely utilizing the natural cooling source, and the cold storage tank 10 is always in the cold storage mode, the first control valve 1 is closed, the second control valve 2 is opened, the third control valve 3 is closed, the fourth control valve 4 is opened, the fifth control valve 5 is opened, the seventh control valve 7 is closed, the sixth control valve 6 is closed, the eighth control valve 8 is closed, the natural cooling device 9 is opened, the first circulating pump 19 is opened, the first compressor 11 is closed, the first electronic expansion valve 13 is closed, the second circulating pump 20 is closed, and the second compressor 15 is closed.

[0089] In the working process, the indoor refrigeration device and the cold storage refrigeration device stop working, the first circulating pump 19 and the natural cooling device 9 start working, the cooling medium cooled by the natural cooling device 9 is output from the outlet, and then sequentially passes through the fifth control valve 5, the cold storage tank 10, the fourth control valve 4, the second control valve 2, the second coil pipe, and the first circulating pump 19 to flow back to the inlet of the natural cooling device 9. The second coil pipe is cooled, the natural cooling device 9 cools the second coil pipe, the cold storage tank 10 stores cold, and the natural cooling device 9 cools the cold storage tank 10.

[0090] In the fourth working mode, emergency operation, single coil pipe refrigeration, and isolation of natural cooling, the first control valve 1 is closed, the second control valve 2 is opened, the third control valve 3 is closed, the fourth control valve 4 is opened, the fifth control valve 5 is closed, the seventh control valve 7 is closed, the sixth control valve 6 is opened, the eighth control valve 8 is closed, the natural cooling device 9 is closed, the first circulating pump 19 is opened, the first compressor 11 is closed, the first electronic expansion valve 13 is closed, the second circulating pump 20 is closed, and the second compressor 15 is closed.

[0091] In the working process, the indoor refrigeration device, the cold storage refrigeration device and the natural cooling device 9 stop working, the first circulating pump 19 starts working, the cooling medium stored in the cold storage tank 10 flows out, sequentially passes through the fourth control valve 4, the second control valve 2, the second coil pipe, the first circulating pump 19 and the sixth control valve 6 to flow back to the cold storage tank 10, the second coil pipe is cooled, the cold storage tank 10 cools the second coil pipe, and in the emergency mode, the high-temperature stored water in the natural cooling device 9 is isolated.

[0092] Please refer to Figure 8 , Figure 8 The deaeration and water replenishment mode operation schematic diagram of the cooling device of the third embodiment provided in the application.

[0093] On the basis of the cooling device provided in each of the above embodiments, a deaeration tank 27 is further included, so that the device has an intelligent deaeration function, and when switched to this mode, deaeration and water replenishment are performed, so that the heat exchange efficiency of the water system is more effectively improved, the oxygen content in the water is reduced, the corrosion to the pipeline is reduced, and the service life of the whole machine and system is improved.

[0094] The inlet of the deaeration tank 27 is connected with the cooling mechanism 14 through the first deaeration valve 28, the outlet of the deaeration tank 27 is connected with the natural cooling device 9 through the second deaeration valve 29, in the winter deaeration and water replenishment operation, the first control valve 1 is closed, the second control valve 2 is opened, the third control valve 3 is closed, the fourth control valve 4 is opened, the fifth control valve 5 is opened, the seventh control valve 7 is closed, the sixth control valve 6 is closed, the eighth control valve 8 is closed, the first deaeration valve 28 is opened, and the second deaeration valve 29 is opened.

[0095] During the working process, the indoor refrigeration device and the cold storage refrigeration device stop working, the first circulating pump 19, the second circulating pump 20 and the natural cooling device 9 start working, the cooling medium cooled by the natural cooling device 9 is output from the outlet, and then flows back to the inlet of the natural cooling device 9 in sequence through the fifth control valve 5, the cold storage tank 10, the fourth control valve 4, the second control valve 2, the second coil pipe and the first circulating pump 19. At the same time, due to the incorporation of the degassing tank 27, the cooling medium flowing out of the second coil pipe is divided by the shunt part, and then flows to the first circulating pump 19 in sequence through the first degassing valve 28, the degassing tank 27, the electric three-way valve 35, the second circulating pump 20 and the second degassing valve 29, thereby completing the degassing and water supplementing work.

[0096] Preferably, the upper end of the cold storage tank 10 is provided with a cold storage automatic exhaust valve 30 and a water supplementing electromagnetic valve 31, and the lower end of the cold storage tank 10 is provided with a drain valve 32; the upper end of the degassing tank 27 is provided with a degassing automatic exhaust valve 33, and the lower end of the degassing tank 27 is provided with a pressure reducing valve 34.

[0097] The above has introduced the cooling device provided by the present application in detail. The principle and implementation mode of the present application are described by applying specific examples in this paper, and the above embodiment is only used to help understand the method of the present application and its core idea. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. Cooling apparatus, characterized in that The device comprises a refrigeration device, a natural cooling device (9), a cold storage tank (10) and a switching device connecting the devices; In the first working mode, the switching device connects the first condensing heat exchanger (12) of the refrigeration device with the natural cooling device (9); In the second working mode, the switching device connects the first condensing heat exchanger (12) with the natural cooling device (9), and the natural cooling device (9) is connected with the cooling mechanism (14) of the refrigeration device; In the third working mode, the switching device connects the natural cooling device (9) with the cooling mechanism (14) and the cold storage tank (10) at the same time; In the fourth working mode, the switching device connects the cold storage tank (10) with the cooling mechanism (14).

2. Cooling device according to claim 1, characterized in that The switching device comprises a first control valve (1), a second control valve (2), a third control valve (3), a fourth control valve (4), a fifth control valve (5) and a sixth control valve (6). The first control valve (1) is arranged between the first condensing heat exchanger (12) and the natural cooling device (9). The second control valve (2) and the third control valve (3) are arranged between the cooling mechanism (14) and the natural cooling device (9) in sequence. The first condensing heat exchanger (12) is connected with the pipeline between the second control valve (2) and the third control valve (3). One end of the fourth control valve (4) is connected with the cold storage tank (10), and the other end of the fourth control valve (4) is connected with the pipeline between the second control valve (2) and the third control valve (3). The fifth control valve (5) is arranged between the natural cooling device (9) and the cold storage tank (10). The sixth control valve (6) is arranged between the cooling mechanism (14) and the cold storage tank (10). In the first working mode, the first control valve (1) is opened, the second control valve (2) is closed, the third control valve (3) is opened, the fourth control valve (4) is closed, the fifth control valve (5) is closed, and the sixth control valve (6) is closed. In the second working mode, the first control valve (1) is opened, the second control valve (2) is opened, the third control valve (3) is opened, the fourth control valve (4) is closed, the fifth control valve (5) is closed, and the sixth control valve (6) is closed. In the third working mode, the first control valve (1) is closed, the second control valve (2) is opened, the third control valve (3) is closed, the fourth control valve (4) is opened, the fifth control valve (5) is opened, and the sixth control valve (6) is closed. In the fourth working mode, the first control valve (1) is closed, the second control valve (2) is opened, the third control valve (3) is closed, the fourth control valve (4) is opened, the fifth control valve (5) is closed, and the sixth control valve (6) is opened, or the fifth control valve (5) is opened, and the sixth control valve (6) is closed.

3. Cooling device according to claim 2, characterized in that The refrigeration device comprises a first compressor (11), the first condensing heat exchanger (12), a first electronic expansion valve (13) and the cold release mechanism (14) connected in series.

4. Cooling device according to claim 3, characterized in that The inner circulation inlet of the first condensing heat exchanger (12) is connected to the first compressor (11), the inner circulation outlet of the first condensing heat exchanger (12) is connected to the first electronic expansion valve (13), the outer circulation inlet of the first condensing heat exchanger (12) is connected to the outlet of the natural cooling device (9) through the third control valve (3), and the outer circulation outlet of the first condensing heat exchanger (12) is connected to the inlet of the natural cooling device (9) through the first control valve (1) and the first circulating pump (19). In the first working mode and the second working mode, the natural cooling device (9) is turned on, the first circulating pump (19) is turned on, the first compressor (11) is turned on, and the first electronic expansion valve (13) is turned on. In the third working mode, the natural cooling device (9) is turned on, the first circulating pump (19) is turned on, the first compressor (11) is turned off, and the first electronic expansion valve (13) is turned off. In the fourth working mode, the natural cooling device (9) is turned off, the first circulating pump (19) is turned on, the first compressor (11) is turned off, and the first electronic expansion valve (13) is turned off, or the natural cooling device (9) is turned on.

5. Cooling device according to claim 4, characterized in that The first coil pipe is connected to the first compressor (11) and the first electronic expansion valve (13), and the second coil pipe is connected to the natural cooling device (9) and the cold storage tank (10).

6. Cooling device according to claim 5, characterized in that The refrigeration device further comprises an evaporation heat exchanger (18), the evaporation heat exchanger (18) is connected in parallel or series to the cold release mechanism (14) through an inner circulation inlet and an inner circulation outlet, and the evaporation heat exchanger (18) is connected to the cold storage tank (10) through an outer circulation outlet and an outer circulation inlet; in the first working mode and the second working mode, the switching device connects the evaporation heat exchanger (18) to the cold storage tank (10).

7. Cooling device according to claim 6, characterized in that The switching device further comprises a seventh control valve (7) and an eighth control valve (8), one end of the seventh control valve (7) is connected to the refrigeration device, the other end of the seventh control valve (7) is connected to the evaporation heat exchanger (18), and the eighth control valve (8) is arranged between the evaporation heat exchanger (18) and the cold storage tank (10); In the first working mode and the second working mode, the seventh control valve (7) is turned on, and the eighth control valve (8) is turned on; in the third working mode and the fourth working mode, the seventh control valve (7) is turned off, and the eighth control valve (8) is turned off.

8. Cooling device according to claim 7, characterized in that The first control valve (1), the second control valve (2), the third control valve (3), the fourth control valve (4), the fifth control valve (5), the sixth control valve (6), the seventh control valve (7) and the eighth control valve (8) are electrically operated two-way valves.

9. Cooling device according to any one of claims 7 to 8, characterized in that Further comprising a degassing tank (27), the inlet of which is connected with the cooling mechanism (14) through a first degassing valve (28), and the outlet of which is connected with the natural cooling device (9) through a second degassing valve (29); when the winter degassing water supplement operation is performed, the first control valve (1) is closed, the second control valve (2) is opened, the third control valve (3) is closed, the fourth control valve (4) is opened, the fifth control valve (5) is opened, the sixth control valve (6) is closed, the seventh control valve (7) is closed, the eighth control valve (8) is closed, the first degassing valve (28) is opened, and the second degassing valve (29) is opened.

10. Cooling device according to claim 9, characterized in that The upper end of the cold storage tank (10) is provided with a cold storage automatic exhaust valve (30) and a water supplement solenoid valve (31), and the lower end of the cold storage tank (10) is provided with a drain valve (32); the upper end of the degassing tank (27) is provided with a degassing automatic exhaust valve (33), and the lower end of the degassing tank (27) is provided with a pressure reducing valve (34).

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