A dual cooling system for electronic equipment and control method thereof

Abstract

The present invention provides a dual-cooling system for electronic equipment and a control method thereof, wherein the dual-cooling system comprises an indoor unit, a first outdoor unit and a second outdoor unit, wherein the second outdoor unit comprises a condenser, a compressor and a second outdoor unit fan, the indoor unit comprises a first fan, a second fan and an evaporator, and the first outdoor unit comprises a first static pressure box, a second static pressure box, an air heat exchanger and a first outdoor unit fan. The cooling system can directly deliver cold air that has undergone secondary cooling to the electronic equipment to be cooled, has high cooling efficiency, and reduces the overall electricity cost. The use of a static pressure box can reduce the supply and exhaust air resistance, reduce the equipment volume, and save space. The first fan and the second fan form a push-pull effect on the air in the indoor hot air flow path to ensure the final cold air volume and pressure. The system structure of the present invention is simple, and has the advantages of flexible application and layout, and is suitable for equipment rooms with high density and limited area.

Description

Technical Field

[0001] The present invention relates to the field of air-conditioning energy conservation and emission reduction, and in particular to a dual-cooling system for electronic equipment and a control method thereof. Background Art

[0002] In the field of indoor precision electronic equipment heat dissipation, especially for 5G base station BBU centralized cabinets, radio frequency transmitters and other electronic equipment and equipment rooms, the room area is generally no more than 40 square meters, the electronic equipment in the room is compactly arranged, and the heat density of components is high. Traditional electronic equipment rooms generally use ordinary air conditioners for heat dissipation, which consumes a lot of electricity.

[0003] In recent years, energy-saving air-conditioning cooling systems have appeared in the public eye. They use dual cooling technology to cool the computer room. Specifically, they combine the air-to-air heat exchanger / heat pipe / fresh air system with the compressor refrigeration system. According to the different seasonal outdoor temperatures, the compressor refrigeration mode, natural cooling mode or energy-saving mode are selected to save energy.

[0004] However, during the use of this type of energy-saving air conditioner, the outdoor fresh air introduced is mixed with a large amount of moisture and dust, which can easily cause equipment pollution and blockage, increase the workload of the equipment, and require the installation of dehumidification and dust removal equipment, which consumes a large amount of consumables, is cumbersome to maintain manually, and increases electricity costs; secondly, the air heat exchanger used in the existing air-cooled heat exchange equipment with dual cooling functions on the market is usually large in size. In order to achieve the change of air flow direction, the traditional pipe connection method is adopted, and the air duct needs to be greatly reduced in diameter and turned in a large range. The on-site installation distance of the computer room usually cannot meet the length required for the diameter change and turning. This type of air duct layout requires a large amount of space in the computer room. Moreover, the extension and turning of the pipe cause a large loss of cold air volume and air pressure. In order to meet the heat dissipation requirements of electronic equipment, it is necessary to increase the fan turbine diameter or increase the fan speed, and increase the power of the air cooling equipment, resulting in high equipment noise; in addition, similar to the disadvantages of ordinary air conditioners, when using this type of energy-saving air conditioner, the cold air entering the cabinet air inlet is not the cold air directly discharged by the air conditioner, but warm air mixed with indoor hot air. A large amount of cold air is wasted, and the cooling effect needs to be further improved. Summary of the invention

[0005] The purpose of the present invention is to provide a dual cooling system for electronic equipment and a control method thereof for indoor electronic equipment such as radar / broadcasting and television transmitters, base station BBU cabinets, etc., which has the problems of insufficient wind pressure and air volume, non-targeted cooling, large size, high noise, and high electricity cost of existing cooling equipment. The cooling system has the dual functions of air-cooled heat exchange and compression refrigeration, and the two can work alone or in coordination. On the basis of making full use of natural cooling, the indoor unit and the air heat exchanger structure are improved to effectively increase the cold air supply volume and wind pressure, reduce the air temperature entering the high-power electronic equipment, improve the cooling efficiency of the cooling equipment, and effectively reduce the electricity cost of the electronic equipment room. The cooling system of the present invention has a compact structure, a small installation distance, and a small footprint. It has the advantages of flexible application and layout, and can be applied to electronic equipment rooms with limited space.

[0006] To achieve the above-mentioned purpose, the present invention provides a dual cooling system for electronic equipment, including an indoor unit, a first outdoor unit, a second outdoor unit, an exhaust duct and a return air duct, the indoor unit includes a first fan, a second fan and an evaporator, the first outdoor unit includes a first static pressure box, a second static pressure box, an air heat exchanger and a first outdoor unit fan, and the second outdoor unit includes a condenser, a compressor and a second outdoor unit fan.

[0007] The first fan includes a first blower, a first air inlet and a first air outlet, and the second fan includes a second blower, a second air inlet and a second air outlet. One end of the exhaust duct is connected to the first air outlet of the first fan, and the other end of the exhaust duct is connected to the first static pressure box; one end of the return air duct is connected to the air heat exchanger, and the other end is connected to the second air inlet of the second fan, and the cold air discharged from the second air outlet of the second fan is used to supply cold air to the electronic equipment to be cooled.

[0008] The first static pressure box and the air heat exchanger are arranged vertically and in parallel in the first outdoor unit, the second static pressure box is arranged horizontally on the upper part of the first outdoor unit and is located above the first static pressure box and the air heat exchanger, and the second static pressure box and the first static pressure box form an inverted L-shaped connected box structure, wherein the lower part of the first static pressure box is connected to the exhaust duct as an inlet, the upper part of the first static pressure box is connected to the left inlet of the second static pressure box as an outlet, the lower side outlet of the second static pressure box is connected to the upper inlet of the air heat exchanger, and the lower outlet of the air heat exchanger is connected to the return air duct.

[0009] The evaporator is arranged downstream of the return air duct and upstream of the second air inlet of the second fan, and the evaporator is connected to the second outdoor unit through a refrigerant circulation pipeline.

[0010] In the cooling system of the present invention, the first fan, the first plenum box, the air heat exchanger, the second plenum box, the evaporator and the second fan are connected in sequence to form an indoor hot air flow path, the compressor, the evaporator and the condenser are connected in sequence to form a refrigerant circulation flow path, the first outdoor unit fan can drive the outdoor cold air to perform primary cooling on the hot air in the indoor hot air flow path through the air heat exchanger, and the refrigerant circulation flow path can perform secondary cooling on the air in the indoor hot air flow path through the evaporator, thereby effectively reducing the cold air temperature and improving the cooling efficiency.

[0011] The first fan and the second fan can form a push-pull effect on the air in the indoor hot air flow path to ensure the air volume and air pressure of the cold air supplied to the electronic equipment.

[0012] Furthermore, the first outdoor unit includes an exhaust duct extension section and a return air chamber. The exhaust duct extension section is a 90° elbow structure, connecting the exhaust duct and the first static pressure box; the return air chamber connects the air heat exchanger and the return air duct.

[0013] Furthermore, the air heat exchanger includes a first fluid channel and a second fluid channel, the first fluid channel and the second fluid channel are perpendicular to each other, wherein the first fluid channel realizes fluid connection between the second static pressure box and the return air chamber, and the second fluid channel is used for outdoor cold air circulation.

[0014] Preferably, the first fluid channels and the second fluid channels are arranged in multiple layers, alternately, and vertically.

[0015] Furthermore, an arc-shaped plate is provided along the length direction of the second static pressure box, and a plurality of air outlet holes are provided at the lower outlet of the second static pressure box. The plurality of air outlet holes are strip holes arranged at intervals, and the plurality of air outlet holes are connected to the first fluid channel.

[0016] Furthermore, the expansion ratio of the first static pressure box is 4.16; and the length of the first static pressure box in the vertical direction is greater than the length of the jet range expansion section, wherein the length of the jet range expansion section is twice the square root of the cross-sectional area of ​​the first static pressure box.

[0017] Or a partition plate is provided at the connection between the first static pressure box and the second static pressure box, and the partition plate extends upward from the top of the air heat exchanger and forms a vent between the partition plate and the top wall of the second static pressure box.

[0018] Furthermore, the indoor unit also includes a first air outlet pipe, the first air outlet pipe is connected to a first air outlet of a first fan, a terminal end of the first air outlet pipe has a first air outlet pipe opening, and the first air outlet pipe opening is connected to the exhaust pipe.

[0019] Furthermore, the indoor unit also includes a second air inlet duct and a second air outlet duct, one end of the second air inlet duct has a second air inlet duct opening, the second air inlet duct opening is connected to the return air duct, the other end of the second air inlet duct is connected to the second air inlet of the second fan; the second air outlet duct is connected to the second air outlet of the second fan.

[0020] Furthermore, the indoor unit also includes a first air inlet chamber, a second air inlet chamber, and the second air inlet pipe, the first air inlet chamber, the evaporator, the second air inlet chamber, the second air inlet port of the second fan, the second blower, the second air outlet and the second air outlet pipe are connected in sequence.

[0021] Furthermore, the dual cooling system also includes a directional air supply duct, the end of the second air outlet duct has a second air outlet port, the inlet of the directional air supply duct is connected to the second air outlet port, and the outlet of the directional air supply duct is close to the cabinet air inlet of the electronic equipment.

[0022] Furthermore, the first blower and the second blower are both volute-type centrifugal fans.

[0023] Further, the first fan is a composite fan including two or more first blowers, and the second fan is a composite fan including two or more second blowers.

[0024] Furthermore, an air inlet door is provided on one side of the first air inlet cavity, and the air inlet door includes a plurality of blades with adjustable angles.

[0025] The present invention also relates to a control method, which is applicable to the above-mentioned dual cooling system for electronic equipment, wherein the first fan, the first static pressure box, the second static pressure box, the air heat exchanger, the evaporator, the second fan and the first outdoor fan constitute an air-cooling heat exchange unit; the evaporator, the condenser, the compressor and the second outdoor fan constitute a compression refrigeration unit; the air-cooling heat exchange unit and the compression refrigeration unit can work alone or in coordination;

[0026] The target temperature is defined as the temperature of the cabinet air outlet of the electronic equipment to be cooled. When the target temperature is lower than 45°C, the dual cooling system for electronic equipment stops working. When the target temperature exceeds 45°C, the dual cooling system for electronic equipment starts working. Specifically, there are three working modes, and different working modes are determined according to the indoor and outdoor temperature difference, as follows:

[0027] Working mode 1: When the indoor temperature - outdoor temperature < 5°C, the compression refrigeration unit works alone;

[0028] Working mode 2: when 5°C ≤ indoor temperature - outdoor temperature ≤ 20°C, the air-cooled heat exchange unit and the compression refrigeration unit work together;

[0029] Working mode 3: When the indoor temperature - the outdoor temperature> 20°C, the air-cooled heat exchange unit works alone.

[0030] Furthermore, the indoor unit also includes a first air inlet chamber, and an air inlet door is provided on one side of the first air inlet chamber. When the compression refrigeration unit works alone, the air inlet door is opened to control the first fan and the first outdoor unit fan to stop working, and only the second fan and the second outdoor unit fan work.

[0031] The present invention has the following beneficial effects:

[0032] The present invention establishes an indoor hot air flow path as a closed-loop circulation pipeline for indoor hot air, and arranges an air-cooled heat exchange unit and a compression refrigeration unit on the indoor hot air flow path to isolate the indoor air from the outdoor air. The two refrigeration units work together, and the indoor air can be pre-cooled by the air-cooled heat exchange unit and then further cooled by the compression refrigeration unit. The present invention can cyclically realize secondary cooling of the indoor hot air, and then directly transport the cooled low-temperature air to the air inlet of the electronic equipment cabinet through the directional air supply duct, so that the cold air is fully utilized, the cooling efficiency is high, the comprehensive electricity cost is reduced, and the introduction of external unclean air to cause equipment pollution, blockage and water mist generation problems is avoided; compared with the traditional pipeline setting, the present invention respectively arranges static pressure boxes on the side and above the air heat exchanger , using the principle of dynamic and static pressure conversion, the pressure loss can be effectively reduced, and the use of the static pressure box can greatly simplify the system structure, with the advantages of flexible application and layout, suitable for high-density and limited-area equipment rooms; by adopting the first fan and the second fan in series to form a push-pull structure, the first fan forms a suction effect on the indoor hot air and promotes the air flow in the indoor hot air flow path, and the second fan forms a traction on the hot air in the indoor hot air flow path. The combined effect of the two can accelerate the air flow in the indoor hot air flow path, provide sufficient power for air circulation, ensure the wind pressure in the air circulation, and promote the accelerated circulation of indoor hot air, with higher cooling efficiency and better cooling effect; the first fan and the second fan are both centrifugal fans, which can meet the needs of large air volume and high pressure of cold air for cooling of high-power electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the overall structure of a dual cooling system for electronic equipment provided by an embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of an indoor hot air flow path and a refrigerant circulation flow path of a dual cooling system for electronic equipment provided by an embodiment of the present invention;

[0036] Figure 3 It is a schematic diagram of a certain direction of the indoor unit structure of a dual cooling system for electronic equipment provided by an embodiment of the present invention;

[0037] Figure 4 It is a schematic diagram of another direction of the indoor unit structure of the dual cooling system for electronic equipment provided by an embodiment of the present invention;

[0038] Figure 5 It is a schematic diagram of a certain direction of a first outdoor unit in an embodiment of a dual cooling system for electronic equipment provided by an embodiment of the present invention;

[0039] Figure 6 It is a schematic diagram of another direction of the first outdoor unit in one embodiment of the dual cooling system for electronic equipment provided by an embodiment of the present invention;

[0040] Figure 7 is a schematic diagram of a certain direction of a first outdoor unit in another embodiment of a dual cooling system for electronic equipment provided by an embodiment of the present invention;

[0041] Figure 8 is a schematic diagram of another direction of the first outdoor unit in another embodiment of the dual cooling system for electronic equipment provided by an embodiment of the present invention;

[0042] Fig. 9 It is a schematic diagram of assembling a dual cooling system for electronic equipment and an electronic equipment cabinet provided by an embodiment of the present invention;

[0043] Fig.10 is a schematic structural diagram of another indoor unit of a dual cooling system for electronic equipment provided by an embodiment of the present invention;

[0044] The accompanying drawings are marked as follows: 1-indoor unit; 11-first fan; 110-first blower; 111-first air inlet; 112-first air outlet; 113-first air outlet pipe; 1131-first air outlet pipe opening; 12-second fan; 122-second air outlet; 123-second air inlet pipe; 1231-second air inlet pipe opening; 124-first air inlet cavity; 125-second air inlet cavity; 126-second air outlet pipe; 1261-second air outlet pipe opening; 127-air inlet door; 13-evaporator; 2-first outdoor unit; 21-first static pressure box; 211-first static pressure box entrance; 212-partition plate; 213-ventilation port; 22-second static pressure box; 221-air outlet hole; 222-arc plate; 23-air heat exchanger; 231-first fluid channel; 232-second fluid channel; 24-first outdoor unit fan; 25-return air chamber; 251-return air chamber outlet; 3-second outdoor unit; 31-condenser; 32-compressor; 33-second outdoor unit fan; 4-exhaust duct; 41-exhaust duct extension; 5-return air duct; 6-cabinet; 61-cabinet air inlet; 62-cabinet air outlet; 7-directional air supply duct. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Example 1

[0047] Overall structure:

[0048] like Figure 1-Figure 4 As shown, the present invention provides a dual cooling system for electronic equipment, including an indoor unit 1, a first outdoor unit 2, a second outdoor unit 3, an exhaust duct 4 and a return duct 5, wherein the indoor unit 1 includes a first fan 11, a second fan 12 and an evaporator 13; the first outdoor unit 2 includes a first plenum box 21, a second plenum box 22, an air heat exchanger 23 and a first outdoor unit fan 24, and the second outdoor unit 3 includes a condenser 31, a compressor 32 and a second outdoor unit fan 33. The indoor hot air flows through the first fan 11, the exhaust duct 4, the first plenum box 21, the second plenum box 22, the air heat exchanger 23, the return duct 5, the evaporator 13 and the second fan 12 in sequence, and is used to cool down the electronic equipment cabinet after being cooled.

[0049] In this embodiment, if Figure 3-Figure 4As shown, the first fan 11 includes a first blower 110, a first air inlet 111 and a first air outlet 112, and the second fan 12 includes a second blower, a second air inlet (not shown in the figure) and a second air outlet 122. The first air outlet 112 of the first fan 11 is connected to the first static pressure box 21 of the first outdoor unit 2 through the exhaust pipe 4, the first static pressure box 21 is connected to the second static pressure box 22 and the air heat exchanger 23 in sequence, the lower outlet of the air heat exchanger 23 is connected to the return air pipe 5, the return air pipe 5 is connected to the second air inlet of the second fan 12, and the cold air discharged from the second air outlet 122 of the second fan 12 is used to supply cold air to the electronic equipment cabinet to be cooled, so as to efficiently cool the electronic equipment.

[0050] The first static pressure box 21 and the air heat exchanger 23 are arranged vertically and in parallel in the first outdoor unit 2, and the second static pressure box 22 is arranged horizontally on the upper part of the first outdoor unit 2 and is located above the first static pressure box 21 and the air heat exchanger 23. The second static pressure box 22 and the first static pressure box 21 form an inverted L-shaped connecting box structure, wherein the lower part of the first static pressure box 21 is connected to one end of the exhaust duct 4 as an inlet, and the upper part of the first static pressure box 21 is connected to the left inlet of the second static pressure box 22 as an outlet, the lower side outlet of the second static pressure box 22 is connected to the upper inlet of the air heat exchanger 23, and the lower outlet of the air heat exchanger 23 is connected to one end of the return air duct 5.

[0051] The evaporator 13 is disposed downstream of the return air duct 5 and upstream of the second air inlet of the second fan 12 . The evaporator 13 is connected to the second outdoor unit 3 through a refrigerant circulation pipeline.

[0052] In this embodiment, if Figure 5-Figure 6As shown, the first outdoor unit 2 is in the shape of a rectangular parallelepiped, and an exhaust duct extension section 41 and a return air chamber 25 are arranged side by side at the lower part of the first outdoor unit 2, wherein the exhaust duct extension section 41 is a 90° elbow design, which is connected to the exhaust duct 4, and is used to guide the hot air to change the air flow direction and inject the hot air into the first static pressure box 21 in the form of a limited jet, and the return air chamber 25 is connected to the return air duct 5. A first static pressure box 21, a second static pressure box 22, and an air heat exchanger 23 are arranged in the middle and upper parts of the first outdoor unit 2, wherein the air heat exchanger 23 is vertically arranged in the middle part of the first outdoor unit 2 near the return air duct 5; the first static pressure box 21 is vertically arranged on the side of the air heat exchanger 23 near the exhaust duct 4, and the lower part of the first static pressure box 21 is connected to the exhaust duct extension section 41 as an inlet; the second static pressure box 22 is horizontally arranged in the upper part of the first outdoor unit 2 and is located above the first static pressure box 21 and the air heat exchanger 23, the second static pressure box 22 and the first static pressure box 21 form an inverted L-shaped connecting box structure, wherein the upper part of the first static pressure box 21 is connected to the left inlet of the second static pressure box 22 as an outlet, the lower side outlet of the second static pressure box 22 is connected to the upper inlet of the air heat exchanger 23, and the lower outlet of the air heat exchanger 23 is connected to the return air chamber 25. During operation, the indoor hot air is vertically sprayed upward into the first static pressure box 21 through the exhaust duct 4 and the exhaust duct extension section 41 under the action of the first fan 11 of the indoor unit 1, enters the second static pressure box 22 through the upper outlet of the first static pressure box 21 and the inlet of the second static pressure box 22, and then enters the air heat exchanger 23 through the lower outlet of the second static pressure box 22. After being cooled by the outdoor cold air in the air heat exchanger 23, it enters the lower return air chamber 25, and finally the cooled air returns to the indoor unit 1 through the return air duct 5 to enter the subsequent working process.

[0053] Among them, the air heat exchanger 23 specifically includes a first fluid channel 231 and a second fluid channel 232. The first fluid channel 231 and the second fluid channel 232 are arranged in multiple layers, alternately, and perpendicular to each other. The second static pressure box 22 is fluidically connected to the return air chamber 25 through the first fluid channel 231. The first fluid channel 231 is used to pass the hot air in the room, and the second fluid channel 232 is used to circulate the cold air outdoors. The flow directions of the two air are perpendicular to each other.

[0054] The dual cooling system for electronic equipment provided in this example has dual cooling units, namely, an air-cooled heat exchange unit and a compression refrigeration unit. Under different working conditions, the air-cooled heat exchange unit and the compression refrigeration unit can work independently or in coordination. When working in coordination, the indoor hot air is first pre-cooled by the air-cooled heat exchange unit and then further cooled by the compression refrigeration unit, which can achieve secondary cooling of the indoor hot air, with better cooling effect and higher cooling efficiency.

[0055] Specifically, the first fan 11, the first plenum box 21, the second plenum box 22, the air heat exchanger 23, the second fan 12 and the first outdoor fan 24 constitute an air-cooled heat exchange unit; the evaporator 13, the condenser 31, the compressor 32 and the second outdoor fan 33 constitute a compression refrigeration unit. The air-cooled heat exchange unit and the compression refrigeration unit correspond to the first outdoor unit 2 and the second outdoor unit 3, respectively, and the two use independent fluid passages. The first outdoor unit 2 mainly uses the outside cold air to cool the air heat exchanger 23 and then cool the indoor hot air flowing through the air heat exchanger 23. For example, in the cold weather in autumn and winter, the air heat exchanger 23 can be naturally cooled by the outside cold air; the second outdoor unit 3 uses the air conditioning refrigeration principle to cool the evaporator 13 and then cool the indoor hot air passing through the evaporator 13.

[0056] Among them, Figure 2 As shown, the first fan 11, the first static pressure box 21, the second static pressure box 22, the air heat exchanger 23, the evaporator 13, and the second fan 12 are connected in sequence to form an indoor hot air flow path. When the air-cooled heat exchange unit is working, the first outdoor fan 24 can drive the outdoor cold air to cool the indoor hot air flow path passing through the air heat exchanger 23, and then transport the cooled cold air through the evaporator 13 and enter the second fan 12. Among them, the evaporator 13 is only used for the flow of cooled cold air due to its position setting, and does not play a role when the air-cooled heat exchange unit works alone.

[0057] The evaporator 13, the compressor 32 and the condenser 31 are connected in sequence to form a refrigerant circulation flow path, wherein the evaporator 13 is arranged downstream of the return air duct 5 and upstream of the second air inlet of the second fan 12, and the evaporator 13 is connected to the second outdoor unit 3 through a refrigerant circulation pipeline. Specifically, the indoor unit 1 also includes a first air inlet chamber 124 and a second air inlet chamber 125, and the evaporator 13 is arranged between the first air inlet chamber 124 and the second air inlet chamber 125. When the compression refrigeration unit is working, the evaporator 13 absorbs a large amount of heat from the hot air flowing through the evaporator 13, thereby cooling the air in the indoor hot air flow path.

[0058] The dual cooling system for electronic equipment provided in this embodiment performs dual cooling in the following working process: the first fan 11 and the second fan 12 of the indoor unit 1 are started, and the hot air in the machine room enters the first fan 11 through the first air inlet 111 under the suction action of the first fan 11, and pushes the indoor hot air along the exhaust duct 4 through the exhaust duct extension section 41 to be ejected into the first static pressure box 21; the air in the first static pressure box 21 enters the second static pressure box 22 and reaches the return air chamber 25 through the first fluid channel 231 in the air heat exchanger 23. During this process, the first outdoor unit fan 24 works to guide the outdoor cold air to pass through the second fluid channel 232 of the air heat exchanger 23 for primary cooling of the hot air therein; the cooled hot air is guided from the return air chamber 25 through the return air duct 5 to the second fan 12 under the push of the first fan 11 and the suction action of the second fan 12. An evaporator 13 is arranged upstream of the second fan 12. The second outdoor unit 3 is started according to actual demand. The indoor hot air after primary cooling is secondary cooled when flowing through the evaporator 13, and the temperature is reduced again. Finally, the cold air after secondary cooling is directly transported to the cabinet air inlet 61 of the cabinet 6 through the second air outlet pipe 126 connected to the second fan 12 through the directional air supply duct 7, so as to efficiently cool the electronic equipment cabinet to be cooled.

[0059] The present invention establishes an indoor hot air flow path as a closed-loop circulation pipeline for the indoor hot air, and arranges an air-cooled heat exchange unit and a compression refrigeration unit on the indoor hot air flow path. The closed-loop indoor hot air flow path does not directly contact the outdoor air, thus avoiding the introduction of external unclean air and the occurrence of water mist. The indoor hot air is circulated back and forth and then directly input into the cabinet 6 after being cooled, so that the cooling capacity is fully utilized. Compared with traditional pipe connections, which require larger diameter changes and larger turns, the present invention combines the air heat exchanger 23 with a static pressure box. The static pressure box is a large space box with a non-pipe structure. Through the structural design of the static pressure box and the air heat exchanger, the structure of the cooling system can be greatly simplified, and there is no need to occupy too much space in the machine room to arrange huge connecting pipes, which is very friendly to equipment rooms with limited space. In addition, for the design of the static pressure box, the cross-sectional area of ​​the junction between the pipe connecting the static pressure box body and the box body is suddenly expanded, forcing the airflow passing through the junction to be more sufficient The airflow expands, and the speed of the airflow gradually decreases during the downward process. At this time, the dynamic pressure of the fluid decreases and the static pressure increases. Through the dynamic and static pressure conversion, the gas in the static pressure box is forced to be evenly and slowly pressed out from the outlet of the static pressure box and enter the air heat exchanger 23. The hot air has a relatively slow flow rate when flowing through the air heat exchanger 23, so there is enough time to fully cool the hot air flowing through the first fluid channel 231 in the air heat exchanger 23. At the same time, the setting of the static pressure box has the advantages of reducing pressure loss and saving space compared with the traditional pipeline setting; the present invention adopts the first fan 11 and the second fan 12 to form a push-pull structure for the indoor hot air flow path. The first fan 11 draws the indoor hot air into the indoor unit and promotes the air flow in the indoor hot air flow path. The second fan 12 draws the hot air in the indoor hot air flow path to form traction. The two work together to ensure the flow rate of the flow path while providing sufficient pressure for the flow path, providing cold air with sufficient air volume and air pressure for the cooling of the cabinet, thereby improving the cooling efficiency.

[0060] Pipeline connection:

[0061] See also Figure 3-Figure 6 , Fig. 9 In the dual cooling system for electronic equipment provided in this embodiment, indoor hot air flows between the indoor unit 1 and the first outdoor unit 2 along the indoor hot air flow path, and the pipe connection of the indoor hot air flow path specifically includes the following parts: a pipe connection method inside the first fan 11, a connection method between the first fan 11 and the first outdoor unit 2, a connection method between the first outdoor unit 2 and the second fan 12, a pipe connection method inside the second fan 12, and a connection method between the second fan 12 and the cabinet 6.

[0062] Specifically, the pipe connection method inside the first fan 11 is: the indoor unit 1 also includes a first air outlet duct 113, the first air inlet 111, the first blower 110, the first air outlet 112, and the first air outlet duct 113 in the first fan 11 are connected in sequence, and the above-mentioned first air outlet duct is a square pipe with a side length of 12 cm.

[0063] Specifically, the connection method between the first fan 11 and the first outdoor unit 2 is as follows: the first air outlet pipe 113 has a first air outlet pipe port 1131, the first air outlet pipe port 1131 is connected to the inlet of the exhaust pipe 4, the exhaust pipe 4 extends toward the first outdoor unit 2 with an exhaust pipe extension section 41, the exhaust pipe extension section 41 is a 90° elbow design, and the exhaust pipe extension section 41 is connected to the first static pressure box inlet 211. Under the action of the first blower 110 and the second blower, the indoor hot air is sucked into the first fan 11 and then passes through the exhaust pipe 4 into the first static pressure box 21.

[0064] Specifically, the connection method between the first outdoor unit 2 and the second fan 12 is: the indoor unit 1 also includes a second air inlet duct 123, the second air inlet duct 123 is connected to one end of the second fan 12, the second air inlet duct 123 has a second air inlet duct port 1231, the second air inlet duct port 1231 is connected to the outlet of the return air duct 5, the inlet of the return air duct 5 is connected to the return air chamber outlet 251 of the return air chamber 25, under the action of the first blower 110 and the second blower, the cooled air in the first outdoor unit 2 is led back to the second fan 12 through the return air chamber 25 and then through the return air duct 5 and the second air inlet duct 123.

[0065] Specifically, the pipe connection method inside the second fan 12 is: the indoor unit 1 also includes a first air inlet chamber 124, a second air inlet chamber 125 and a second air outlet pipe 126, the first air inlet chamber 124 and the second air inlet chamber 125 are rectangular cavity structures adapted to the shape of the evaporator 13, the second air inlet pipe 123, the first air inlet chamber 124, the evaporator 13, the second air inlet chamber 125, the second air inlet, the second blower, the second air outlet 122 and the second air outlet pipe 126 are connected in sequence, and the second air outlet pipe 126 is used for cooling equipment or machine rooms.

[0066] Specifically, Fig. 9As shown, the connection mode between the second fan 12 and the cabinet 6 is as follows: the dual cooling system for electronic equipment further includes a directional air supply duct 7, the end of the second air outlet duct 126 has a second air outlet port 1261, the inlet of the directional air supply duct 7 is connected to the second air outlet port 1261, and the outlet of the directional air supply duct 7 is close to the air inlet of the electronic equipment to be cooled. In this embodiment, the electronic equipment to be cooled can be a BBU base station cabinet 6 or a radar / broadcasting and television transmitter cabinet 6, etc. The air inlet of the electronic equipment to be cooled is the cabinet air inlet 61. The cooled air can be directly transported to the cabinet 6 through the directional air supply duct 7 to avoid the cooled air being dispersed in the air and mixed with the air in the machine room, and the cooling effect is significantly improved.

[0067] The overall pipeline connection method of the indoor hot air flow path is: first air inlet 111-first blower 110-first air outlet 112-first air outlet 113-exhaust duct 4-exhaust duct extension section 41-first static pressure box 21-second static pressure box 22-first fluid channel 231 in the air heat exchanger 23-return air chamber 25-return air duct 5-second air inlet duct 123-first air inlet chamber 124-evaporator 13-second air inlet chamber 125-second air inlet-second blower-second air outlet 122-second air outlet 126-directional air supply duct 7-cabinet air inlet 61. The entire pipeline is a closed pipeline with two-stage cooling and high cooling efficiency. It can also avoid absorbing outdoor air, introducing outdoor unclean air and generating water mist.

[0068] Static pressure box structure:

[0069] like Figure 5-Figure 6 As shown, the first static pressure box 21 is vertically arranged on the side of the air heat exchanger 23 close to the exhaust duct 4, and the lower part of the first static pressure box 21 is connected to the exhaust duct extension section 41 of the exhaust duct 4 as an inlet; the second static pressure box 22 is horizontally arranged on the upper part of the first outdoor unit 2 and is located above the first static pressure box 21 and the air heat exchanger 23, wherein the upper part of the first static pressure box 21 is connected to the left inlet of the second static pressure box 22 as an outlet, the lower side outlet of the second static pressure box 22 is connected to the upper inlet of the air heat exchanger 23, and the lower outlet of the air heat exchanger 23 is connected to the return air chamber 25.

[0070] In this embodiment, the first static pressure box 21 and the second static pressure box 22 form an inverted L-shaped connected box structure. An arc plate 222 is provided along the length direction of the second static pressure box 22 from the top of the left inlet of the second static pressure box 22 to the end of the bottom outlet of the second static pressure box 22. The lower outlet of the second static pressure box 22 is provided with a plurality of air outlet holes 221, and the air outlet holes 221 are strip holes arranged at intervals, and the total area of ​​the air outlet holes 221 accounts for about 1 / 2 of the bottom area of ​​the second static pressure box. The gas in the second static pressure box 22 enters the first fluid channel 231 in the air heat exchanger 23 through the plurality of air outlet holes 221.

[0071] When the cross-section inside the static pressure box is consistent, the dynamic pressure of the internal airflow gradually decreases along the gas flow direction, and the static pressure gradually increases. An arc plate 222 is provided in the second static pressure box 22, so that the volume of the second static pressure box 22 can be gradually reduced in the gas flow direction, thereby compensating for the difference caused by the gradual increase in static pressure, thereby ensuring that the wind pressure and wind speed of the air outlets 221 are relatively uniform. At the same time, the setting of the arc plate 222 has a good guiding effect, allowing the airflow to enter the air outlet 221 more smoothly.

[0072] For the size design of the static pressure box, it is considered that the effect of the static pressure box is related to the expansion ratio of the static pressure box and the length of the box body. Among them, the larger the expansion ratio, the better the effect. The expansion ratio is the ratio of the cross-sectional area of ​​the static pressure box body section to the cross-sectional area of ​​the exhaust duct extension section. Specifically in this embodiment, the expansion ratio is the ratio of the cross-sectional area of ​​the box body of the first static pressure box 21 to the cross-sectional area of ​​the exhaust duct extension section 41. In addition, the wind flow injected into the static pressure box from the exhaust duct extension section is a limited jet. After the wind flow is injected into the static pressure box, its dynamic pressure must be converted into static pressure as much as possible to achieve the effect of the static pressure box. For this reason, it is necessary to ensure that the length of the static pressure box is greater than the length of the jet range expansion section. Experiments have shown that the length of the above-mentioned jet range expansion section is about twice the square root of the cross-sectional area of ​​the static pressure box. Specifically in this embodiment, the length of the first static pressure box 21 in the vertical direction needs to be greater than the length of the jet range expansion section. The length of the jet range expansion section is twice the square root of the cross-sectional area of ​​the first static pressure box 21.

[0073] The dual cooling system for electronic equipment provided in this embodiment has an indoor unit 1 with a size of 62cm*38cm*92.5cm, a first outdoor unit 2 with a size of 50cm*55cm*112cm, a compressor 32 with a cooling power of 5KW, a cross-section of the exhaust pipe 4 with a side length of 12cm, a rated output air volume of 680m³ / h, a maximum output air volume of 800m³ / h, and a maximum output air pressure of 620Pa; the air heat exchanger 23 in the first outdoor unit 2 is a cross-flow plate air heat exchanger structure with a length of 30cm, a width of 30cm, a height of 60cm, a heat exchange area of ​​16.4m², and a heat exchange efficiency of 60% under the condition of the rated output air volume. Combined with the application environment's requirement that the equipment needs to occupy a small amount of space, in this embodiment, the size of the first static pressure box 21 is designed to be 15cm*40cm*85cm, and the height of the outlet of the first static pressure box 21 is 15cm, which is also the height of the inlet of the second static pressure box 22. In this embodiment, the cross-sectional area (15cm*40cm) of the first static pressure box 21 is 600cm², the size of the exhaust pipe extension section 41 is the same as the size of the exhaust pipe 4, and its cross-sectional area (12cm*12cm) is 144cm², and the expansion ratio (600cm² / 144cm²) reaches 4.16. The jet expansion section distance of the first static pressure box 21 is the square root of the cross-sectional area of ​​the first static pressure box 21 * 2, reaching 49cm, and the length of the first static pressure box 21 is designed to be 85cm, which meets the above design requirements.

[0074] Figure 7-Figure 8 Another embodiment of the first outdoor unit is shown, which is different from the first outdoor unit in the aforementioned embodiment only in that the second plenum box 22 has no arc plate design, but a partition plate 212 is provided at the connection between the first plenum box 21 and the second plenum box 22, the partition plate 212 extends upward from the top of the air heat exchanger 23 and partially blocks the left inlet of the second plenum box 22, and forms a vent 213 between the partition plate 212 and the top wall of the second plenum box 22, and the vent 213 is half the height of the inlet of the second plenum box 22 in the vertical direction, that is, 7.5 cm. The vent 213 connects the first plenum box 21 with the second plenum box 22, and the gas in the first plenum box 21 is gradually pressed into the second plenum box 22 from the vent 213.

[0075] Centrifugal fan:

[0076] In the dual cooling system for electronic equipment provided in this embodiment, see Figure 1A mesh cover is provided on one side of the indoor unit 1 to allow air to enter the indoor unit, which can continuously draw the indoor hot air into the indoor unit 1. The air heat exchanger 23 and the evaporator 13 in the indoor hot air flow path have relatively large wind resistance, and the first static pressure box 21 and the second static pressure box 22 also have a certain pressure loss. In order to overcome the wind resistance and pressure loss in the indoor hot air flow path, the fan driving the air path needs to have the characteristics of high pressure and high flow. Figure 3-Figure 4 In this embodiment, the indoor unit 1 includes a first fan 11 and a second fan 12 connected in series, wherein the first fan 11 includes a first blower 110, and the second fan 12 includes a second blower. The first air inlet 111 of the first fan 11 faces the indoor machine room, and the second air inlet of the second fan 12 faces the second air inlet chamber 125. The first blower 110 forms a suction effect on the indoor hot air and pushes the air in the indoor hot air flow path to flow to the first outdoor unit 2. The second blower forms a traction on the hot air in the indoor hot air flow path. The first blower 110 and the second blower can form a push-pull effect on the air in the indoor hot air flow path. The cooperation of the two can accelerate the movement of air in the indoor hot air flow path. The series connection can double the air volume without changing the pressure. In addition, the first blower 110 and the second blower can adopt volute type centrifugal fans.

[0077] In the present invention, there is no limitation on the number of blowers of each fan, wherein the first fan 11 may include one or two or more first blowers 110 connected in parallel to form a composite fan, and the second fan 12 may include one or two or more second blowers connected in parallel to form a composite fan.

[0078] Furthermore, the first blower 110 and the second blower are each separately provided with a frequency converter, and the fan pressure and flow rate can be increased by adjusting the driving frequency of each fan to match a better working condition. In actual applications, the driving frequency of the first blower 110 is higher than the driving frequency of the second blower. In this way, the fatigue degree of the fan can be reduced and the stability of the equipment can be increased.

[0079] Embodiment 2

[0080] This embodiment provides a dual cooling system for electronic equipment. Different from the above embodiment, the cooling system can also be provided with an air inlet door 127 on the side of the first air inlet cavity 124 away from the evaporator 13. Fig.10, the air inlet door 127 includes a plurality of blades with adjustable angles, which can be driven to open or close by remote control or power switch. When the compressor refrigeration unit works alone, the air inlet door 127 can be opened, and the first fan 11 and the first outdoor unit fan 24 are controlled to stop running, and the second fan 12 and the second outdoor unit 3 are operated. The second fan 12 can draw indoor air and allow it to enter the indoor unit 1 from the air inlet door 127, and then be transported to the electronic equipment to be cooled after being cooled by the evaporator 13. The specific circulation path of indoor hot air in this embodiment is: air inlet door 127-first air inlet chamber 124-evaporator 13-second air inlet chamber 125-second air inlet-second blower-second air outlet 122-second air outlet pipe 126-second air outlet pipe port 1261-directional air supply duct 7-cabinet air inlet 61.

[0081] In this working mode, only the second fan 12 and the second outdoor unit 3 work, and the first fan 11 and the first outdoor unit fan 24 stop running, which can reduce the energy consumption of the indoor unit 1 and the first outdoor unit 2 in the non-working mode, save electricity, and reduce electricity costs.

[0082] It should be noted that the setting position of the air inlet door 127 is not limited to the side of the first air inlet cavity 124 away from the evaporator 13 , and can also be set on the peripheral side of the first air inlet cavity 124 close to the evaporator 13 .

[0083] Embodiment 3

[0084] This embodiment is an application example of the dual cooling system of the present invention in a radar transmitter. The radar transmitter has a transmission power of 10KW, and the heat dissipation method is air cooling. The cabinet 6 of the transmitter is provided with a cabinet air inlet 61 on the side, a cabinet air outlet 62 on the top, a high-power centrifugal heat exhaust fan inside the cabinet 6, and the transmitter is placed in a machine room.

[0085] See also Fig. 9 , usually when the room temperature is constant at 22℃, under normal load conditions, the temperature of the cabinet air outlet 62 generally does not exceed 50℃; during certain high-load continuous working periods, the temperature of the cabinet air outlet 62 can reach 65℃. For every 10℃ increase in the junction temperature of the power transistor of the transmitter, its reliability will decrease by 60%. During this period, power components such as the power amplifier and power distributor in the cabinet 6 are prone to thermal damage and thermal failure, resulting in a decrease in radar performance and an increase in the frequency of radar downtime.

[0086] In order to solve the above problems, the dual cooling system for electronic equipment provided by the present invention is applied to the radar transmitter room, and a terminal air outlet is set at the air inlet 61 of the transmitter cabinet. Figure 3-Figure 4The second air outlet 1261 of the indoor unit 1 is connected to the terminal air outlet through a directional air supply duct 7. The terminal air outlet is an air outlet component with a flow channel inside. The indoor air further cooled by the cooling system is blown out through the terminal air outlet and enters the cabinet air inlet 61.

[0087] A target temperature sensor is provided at the cabinet air outlet 62 at the top of the cabinet 6 . The target temperature is the temperature of the cabinet air outlet 62 . The target temperature sensor is electrically connected to the control panel of the dual cooling system of the present invention.

[0088] The specific working process of the cooling system provided in this embodiment is as follows:

[0089] When the target temperature detected by the target temperature sensor is lower than 45°C, the dual cooling system for electronic equipment is controlled to stop working; when the target temperature exceeds 45°C, the dual cooling system for electronic equipment is controlled to work. According to the indoor and outdoor temperature differences, the dual cooling system of this embodiment can provide three working modes, and the air-cooled heat exchange unit and the compression refrigeration unit can work alone or in coordination, as follows:

[0090] Working mode 1: When the indoor temperature minus the outdoor temperature is less than 5°C, only the compression refrigeration unit works alone, that is, the indoor unit 1 and the second outdoor unit 3 are turned on, and the first outdoor unit 2 is turned off. It has been calculated that when the indoor temperature is 24°C and the outdoor temperature is 20°C, at the rated air volume, the air outlet temperature of the second air outlet 1261 can reach 14°C;

[0091] Working mode 2: When 5℃≤indoor temperature-outdoor temperature≤20℃, the air-cooled heat exchange unit works in coordination with the compression refrigeration unit, that is, the indoor unit 1, the first outdoor unit 2 and the second outdoor unit 3 are all turned on. According to calculations, when the indoor temperature is 24℃ and the outdoor temperature is 10℃, at the rated air volume, the air outlet temperature of the second air outlet 1261 can be as low as 9.8℃, which is 4.2℃ lower than when the compressor refrigeration unit works alone;

[0092] Working mode 3: When the indoor temperature - outdoor temperature > 20°C, only the air-cooled heat exchange unit works alone, that is, the indoor unit 1 and the first outdoor unit 2 are turned on, and the second outdoor unit 3 is turned off. It is calculated that when the indoor temperature is 24°C and the outdoor temperature is -10°C, at the rated air volume, the temperature of the second air outlet 1261 can reach 13.8°C.

[0093] It should be noted that the example values ​​under the above three working modes are calculated under the conditions that the compressor cooling power is 5KW, the exhaust duct cross-section is square with a side length of 12cm, the rated output air volume is 680m³ / h, the air heat exchanger adopts a cross-flow plate heat exchanger with a size of 30cm*30cm*60cm, a heat exchange area of ​​16.4m², and a heat exchange efficiency of 60%.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual cooling system for electronic equipment, comprising an indoor unit, a first outdoor unit, a second outdoor unit, an exhaust duct and a return duct, wherein the second outdoor unit comprises a condenser, a compressor and a second outdoor unit fan, characterized in that: The indoor unit includes a first fan, a second fan and an evaporator, and the first outdoor unit includes a first plenum box, a second plenum box, an air heat exchanger and a first outdoor unit fan; The first fan includes a first blower, a first air inlet and a first air outlet, the second fan includes a second blower, a second air inlet and a second air outlet, one end of the exhaust duct is connected to the first air outlet of the first fan, and the other end of the exhaust duct is connected to the first static pressure box; one end of the return air duct is connected to the air heat exchanger, and the other end of the return air duct is connected to the second air inlet of the second fan, and the cold air discharged from the second air outlet of the second fan is used to supply cold air to the electronic equipment to be cooled; The first static pressure box and the air heat exchanger are arranged vertically and in parallel in the first outdoor unit, the second static pressure box is arranged horizontally on the upper part of the first outdoor unit and is located above the first static pressure box and the air heat exchanger, and the second static pressure box and the first static pressure box form an inverted L-shaped connecting box structure, wherein the lower part of the first static pressure box is connected to the exhaust duct as an inlet, the upper part of the first static pressure box is connected to the left inlet of the second static pressure box as an outlet, the lower side outlet of the second static pressure box is connected to the upper inlet of the air heat exchanger, and the lower outlet of the air heat exchanger is connected to the return air duct; The evaporator is arranged downstream of the return air duct and upstream of the second air inlet of the second fan, and the evaporator is connected to the second outdoor unit through a refrigerant circulation pipeline; The first outdoor unit fan can guide the outdoor cold air to pass through the air heat exchanger to perform primary cooling on the indoor hot air therein; the indoor hot air that has undergone primary cooling is guided to the second fan through the return air duct, and the second outdoor unit is started according to actual needs, and the indoor hot air that has undergone primary cooling is secondary cooled when flowing through the evaporator.

2. The dual cooling system for electronic equipment according to claim 1, characterized in that: The first outdoor unit includes an exhaust duct extension section and a return air chamber. The exhaust duct extension section is a 90° elbow structure, connecting the exhaust duct and the first static pressure box; the return air chamber connects the air heat exchanger and the return air duct.

3. The dual cooling system for electronic equipment according to claim 2, characterized in that: The air heat exchanger includes a first fluid channel and a second fluid channel, the first fluid channel and the second fluid channel are perpendicular to each other, wherein the first fluid channel realizes fluid communication between the second static pressure box and the return air chamber, and the second fluid channel is used for outdoor cold air circulation.

4. The dual cooling system for electronic equipment according to claim 3, characterized in that: The first fluid channels and the second fluid channels are arranged in multiple layers, alternately and vertically.

5. The dual cooling system for electronic equipment according to claim 4, characterized in that: An arc plate is provided along the length direction of the second static pressure box, and a plurality of air outlet holes are provided at the lower outlet of the second static pressure box. The plurality of air outlet holes are strip holes arranged at intervals, and the plurality of air outlet holes are connected to the first fluid channel.

6. The dual cooling system for electronic equipment according to any one of claims 1 to 5, characterized in that: The expansion ratio of the first static pressure box is 4.16; and the length of the first static pressure box in the vertical direction is greater than the length of the jet range expansion section, wherein the length of the jet range expansion section is twice the square root of the cross-sectional area of ​​the first static pressure box.

7. The dual cooling system for electronic equipment according to any one of claims 1 to 5, characterized in that: A partition plate is provided at the connection between the first static pressure box and the second static pressure box. The partition plate extends upward from the top of the air heat exchanger and forms a vent between the partition plate and the top wall of the second static pressure box.

8. The dual cooling system for electronic equipment according to claim 1, characterized in that: The indoor unit further includes a first air outlet pipe, the first air outlet pipe is connected to a first air outlet of a first fan, a terminal end of the first air outlet pipe has a first air outlet pipe opening, and the first air outlet pipe opening is connected to the exhaust pipe.

9. The dual cooling system for electronic equipment according to claim 8, characterized in that: The indoor unit also includes a second air inlet duct and a second air outlet duct, one end of the second air inlet duct has a second air inlet duct opening, the second air inlet duct opening is connected to the return air duct, the other end of the second air inlet duct is connected to the second air inlet of the second fan; the second air outlet duct is connected to the second air outlet of the second fan.

10. The dual cooling system for electronic equipment according to claim 9, characterized in that: The indoor unit also includes a first air inlet chamber and a second air inlet chamber. The second air inlet pipe, the first air inlet chamber, the evaporator, the second air inlet chamber, the second air inlet of the second fan, the second blower, the second air outlet and the second air outlet pipe are connected in sequence.

11. The dual cooling system for electronic equipment according to claim 10, characterized in that: The system also includes a directional air supply duct, the end of the second air outlet duct has a second air outlet port, the inlet of the directional air supply duct is connected to the second air outlet port, and the outlet of the directional air supply duct is close to the cabinet air inlet of the electronic equipment to be cooled.

12. The dual cooling system for electronic equipment according to claim 1, characterized in that: The first blower and the second blower are both volute-type centrifugal fans.

13. The dual cooling system for electronic equipment according to claim 12, characterized in that: The first fan is a composite fan including two or more of the first blowers, and the second fan is a composite fan including two or more of the second blowers.

14. The dual cooling system for electronic equipment according to claim 10, characterized in that: An air inlet door is provided on one side of the first air inlet cavity, and the air inlet door includes a plurality of blades with adjustable angles.

15. A control method, applicable to the dual cooling system for electronic equipment as claimed in any one of claims 1 to 14, characterized in that: The first fan, the first static pressure box, the second static pressure box, the air heat exchanger, the evaporator, the second fan and the first outdoor unit fan constitute an air-cooled heat exchange unit; the evaporator, the condenser, the compressor and the second outdoor unit fan constitute a compression refrigeration unit; the air-cooled heat exchange unit and the compression refrigeration unit can work alone or in coordination; When the air outlet temperature of the cabinet of the electronic equipment is lower than 45°C, the dual cooling system for the electronic equipment stops working. When the air outlet temperature of the cabinet of the electronic equipment exceeds 45°C, the dual cooling system for the electronic equipment starts working. The working mode is determined according to the indoor and outdoor temperature difference. The specific working modes are as follows: Working mode 1: When the indoor temperature - outdoor temperature < 5°C, the compression refrigeration unit works alone; Working mode 2: when 5°C ≤ indoor temperature - outdoor temperature ≤ 20°C, the air-cooled heat exchange unit and the compression refrigeration unit work together; Working mode 3: When the indoor temperature - the outdoor temperature> 20°C, the air-cooled heat exchange unit works alone.

16. The control method according to claim 15, characterized in that: The indoor unit also includes a first air inlet chamber, and an air inlet door is provided on one side of the first air inlet chamber. When the compression refrigeration unit works alone, the air inlet door is opened to control the first fan and the first outdoor unit fan to stop working, and only control the second fan and the second outdoor unit fan to start working.

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