Column server liquid cooling cabinet heat dissipation system with multi-mode cooperative heat dissipation

Abstract

The utility model discloses a multi-mode collaborative heat dissipation array server liquid cooling cabinet heat dissipation system, which comprises two array server liquid cooling cabinets, two cooling capacity distribution units, two heat pipe air conditioner all-in-one machines and the like, and each heat pipe air conditioner all-in-one machine comprises a heat pipe natural cold source refrigeration loop and a compressor mechanical refrigeration loop. The two refrigerating circuits independently or jointly provide an outdoor cold source for the cooling capacity distribution unit, heat from the two server liquid cooling cabinets in rows is transmitted to the heat pipe air conditioner all-in-one machine in the cooling capacity distribution unit, and therefore the heat is transmitted out of a machine room. An outdoor cold source adopts the heat pipe air conditioner all-in-one machine combining a natural cold source and mechanical refrigeration, Freon refrigerants are provided for the primary side of the cooling capacity distribution unit, the system saves energy, and outdoor pipelines do not have the risk of frost cracking in winter; the secondary side of the cooling capacity distribution unit adopts cooling liquid to directly take out heat of the liquid cooling server and transfer the heat to the primary side, the heat exchange capacity is large, the heat exchange efficiency is high, and the PUE of the data center can be remarkably reduced.

Description

Technical Field

[0001] This utility model belongs to the field of server room heat dissipation, and relates to heat dissipation of liquid-cooled server racks in rows. In particular, it relates to a multi-mode collaborative heat dissipation system for liquid-cooled server racks in rows, which is used to achieve stable, efficient and energy-saving heat dissipation in different seasonal environments under high heat density conditions of servers. Background Technology

[0002] High-heat-density server racks generate significant heat during operation. Existing efficient heat dissipation solutions for data centers, employing row-level or rack-level cooling, have proven highly effective. However, for ultra-high-density data centers, traditional air cooling methods are limited by issues such as low air specific heat capacity and uneven airflow, making it difficult to meet the heat dissipation requirements of high-heat-density racks. Against this backdrop, liquid cooling solutions, with their high heat exchange efficiency, are increasingly being adopted.

[0003] Currently, liquid cooling technology is mainly used in high heat density servers or entire liquid-cooled racks. Common liquid cooling solutions include immersion liquid cooling, cold plate liquid cooling, and backplane liquid cooling. Among them, cold plate liquid cooling has become one of the mainstream cooling methods for liquid-cooled servers due to its clear structure, flexible deployment, and convenient maintenance. Cold plate liquid cooling systems typically include a cooling distribution unit, which serves as a heat exchange hub connecting the liquid-cooled server and the upstream cold source system.

[0004] Cooling distribution units (CDUs) typically employ a dual-loop structure. The secondary side cools the servers via a circulating liquid, and heat is transferred to the primary side via an intermediate heat exchanger. The primary side then exchanges heat with an outdoor cold source to achieve final heat dissipation. However, liquid-cooled CDUs often use water, ethylene glycol, or propylene glycol solutions as heat exchange media on both the primary and secondary sides. In cold northern climates, prolonged exposure of the primary side piping to low temperatures can cause water-based heat exchange media to freeze and expand, leading to pipe cracks, equipment damage, or system shutdowns. This severely impacts system stability and data center operational safety, requiring special attention to freeze protection of the heat exchange media in systems where the primary side connects to the outdoor cold source. Furthermore, most current liquid cooling systems rely on a specific single cooling method (such as mechanical compression refrigeration) for heat dissipation efficiency. When outdoor temperature variations are abundant, they cannot fully utilize natural cold sources, resulting in limited overall energy efficiency, higher operating costs, and a failure to align with the development trend of green and energy-efficient data centers. Meanwhile, data centers have extremely high reliability requirements for their cooling systems. However, traditional liquid cooling systems often use a single cooling source design. If a critical component (such as the coolant pump or outdoor condenser) fails, the entire cooling system may fail. Although some solutions use dual-pump backup, they lack overall redundancy design for the cooling capacity distribution unit and outdoor cooling source equipment, and there is still a risk of single point of failure.

[0005] In summary, existing liquid-cooled server racks still have shortcomings in terms of heat dissipation, energy efficiency optimization, and redundancy design, making it difficult to meet the stringent requirements of high-latitude regions, ultra-high-density data centers, and year-round uninterrupted operation. Therefore, designing a solution that can efficiently address the heat dissipation problem of liquid-cooled server racks while also protecting outdoor units from freezing in cold northern seasons is an urgent technical challenge. Summary of the Invention

[0006] (a) Technical issues

[0007] To address at least one of the aforementioned shortcomings and deficiencies in the existing technology, this utility model aims to provide a multi-mode collaborative heat dissipation system for liquid-cooled server racks. The outdoor cold source utilizes a heat pipe air conditioning unit that combines natural cold source and mechanical refrigeration to provide Freon-based refrigerant to the primary side of the cooling capacity distribution unit. The system is energy-efficient and the outdoor pipelines are free from the risk of freezing and cracking in winter. The secondary side of the cooling capacity distribution unit uses coolant to directly remove heat from the liquid-cooled servers in the server rack and transfer the heat to the Freon-based refrigerant on the primary side. This results in a large heat exchange capacity and high heat exchange efficiency, which can significantly reduce the PUE of the data center and ensure the safe and stable operation of the data center.

[0008] (II) Technical Solution

[0009] The technical solution adopted by this utility model to solve its technical problem is:

[0010] A multi-mode collaborative heat dissipation system for liquid-cooled server racks, designed for efficient heat exchange and safe heat dissipation under high heat density operating conditions of servers in different environments, including:

[0011] The server liquid-cooled racks are arranged in two rows facing each other, with multiple server liquid-cooled racks arranged adjacent to each other in each rack, and at least one liquid-cooled server in each rack.

[0012] The cooling capacity distribution unit is set up in two sets, one for backup and one for use. They are respectively arranged at the head, middle or tail of the two rows of liquid-cooled server racks. Each cooling capacity distribution unit includes an intermediate heat exchanger. Each intermediate heat exchanger includes a primary side and a secondary side. The primary side is circulated with refrigerant and the secondary side is circulated with coolant to realize heat exchange between refrigerant and coolant.

[0013] The distributor includes two inlets and multiple outlets. The two inlets are respectively connected to the secondary side outlets of the two intermediate heat exchangers, and each outlet is respectively connected to the coolant inlet of each liquid-cooled server. It is used to distribute the coolant to each liquid-cooled server for heat exchange.

[0014] The liquid collector includes multiple inlets and two outlets. Each inlet is connected to the coolant outlet of each liquid-cooled server, and the two outlets are connected to the secondary side inlets of the two intermediate heat exchangers. It is used to collect the high-temperature coolant discharged from each liquid-cooled server and return it to the cooling capacity distribution unit.

[0015] The integrated heat pipe air conditioning unit is configured in two sets, one for standby and one for use, each corresponding to an intermediate heat exchanger. Each set includes a heat pipe natural cold source refrigeration circuit and a compressor mechanical refrigeration circuit. The two circuits are connected in parallel on the secondary side of the corresponding intermediate heat exchanger, and can be selected to operate individually or in concert through valve components to provide a cold source for the corresponding secondary side, achieving efficient heat dissipation under different environmental conditions.

[0016] This utility model relates to a multi-mode collaborative heat dissipation system for liquid-cooled server racks. The heat pipe natural cold source cooling circuit and the compressor mechanical cooling circuit provide outdoor cold sources for the corresponding cooling capacity distribution units, either individually or jointly. The heat from each liquid-cooled server in the rack is collected in the secondary side water of the collector and flows back to the cooling capacity distribution unit for cooling. After cooling, the secondary side water enters the distributor and is then distributed to each liquid-cooled server in each rack to absorb heat again, thereby dissipating the heat from the server room.

[0017] Preferably, each heat pipe air conditioning unit further includes a refrigerant inlet three-way valve and a refrigerant outlet three-way valve. The inlet of the refrigerant inlet three-way valve is connected to the primary side outlet of the corresponding intermediate heat exchanger, and the outlet of the refrigerant outlet three-way valve is connected to the primary side inlet of the corresponding intermediate heat exchanger. The heat pipe natural cold source refrigeration circuit includes a heat pipe condenser. The inlet of the heat pipe condenser is connected to the first outlet of the refrigerant inlet three-way valve, and the outlet of the heat pipe condenser is connected to the first inlet of the refrigerant outlet three-way valve. The compressor mechanical refrigeration circuit includes an air-cooled condenser, an expansion valve, a refrigerant evaporator, a compressor, and connecting pipes between the four components. The hot side inlet of the refrigerant evaporator is connected to the second outlet of the refrigerant inlet three-way valve, and the hot side outlet is connected to the second inlet of the refrigerant outlet three-way valve.

[0018] Preferably, a liquid receiver and a refrigerant pump are optionally installed in parallel on the connecting pipeline between the outlet of each refrigerant three-way valve and the primary side inlet of the corresponding intermediate heat exchanger. The liquid receiver is used to store and stabilize the refrigerant flow, and the refrigerant pump is used to provide refrigerant circulation power when there is a need for power drive or when the system adjustment force needs to be increased.

[0019] Preferably, each heat pipe air conditioner unit also includes a sheet metal casing and an outdoor fan. The heat pipe natural cold source refrigeration circuit, the compressor mechanical refrigeration circuit, the outdoor fan, the refrigerant inlet three-way valve, and the refrigerant outlet three-way valve are all installed inside the sheet metal casing.

[0020] Furthermore, the heat pipe air conditioner also includes an outdoor unit controller installed in a sheet metal casing, and a temperature sensor and a pressure sensor connected to it in communication. The outdoor unit controller dynamically adjusts the operating mode of the heat pipe air conditioner and the operating status of the outdoor fan according to preset logic based on the monitored outdoor temperature and refrigerant pipeline pressure data.

[0021] Preferably, the integrated heat pipe air conditioner selects the operating circuit according to the availability of outdoor cold source: when the outdoor natural cold source is sufficient, only the heat pipe natural cold source refrigeration circuit operates; when the outdoor natural cold source can provide some cooling capacity, the heat pipe natural cold source refrigeration circuit and the compressor mechanical refrigeration circuit operate simultaneously; when the outdoor natural cold source cannot provide cooling capacity, only the compressor mechanical refrigeration circuit operates.

[0022] Preferably, two coolant pumps, one main and one backup, are installed in parallel on the secondary side inlet or outlet pipe of each intermediate heat exchanger. When the main coolant pump fails or the flow rate in the secondary side coolant circulation loop is lower than a preset threshold, the backup coolant pump is switched to operate to ensure that the coolant circulation is uninterrupted. The coolant pump adopts frequency conversion control and adjusts its speed according to the system load.

[0023] Preferably, each cooling capacity distribution unit is equipped with a distribution unit controller and a temperature and humidity sensor, a pressure sensor, a leakage sensor, and an automatic pressure relief device connected to it. These are used to monitor the ambient temperature and humidity of the computer room, the inlet / outlet refrigerant temperature on the primary side, the supply / return coolant temperature on the secondary side, the supply / return coolant pressure on the secondary side, and whether there is any leakage in the unit. When the coolant circulation pressure exceeds the limit, the automatic pressure relief device is activated, and the speed and start / stop of the coolant pump are adjusted according to the load and operating requirements. When leakage occurs or the monitored temperature or pressure exceeds the limit, an alarm is issued and uploaded to the upper monitoring system.

[0024] Preferably, the intermediate heat exchanger is a plate heat exchanger or a shell-and-tube heat exchanger, with Freon-based refrigerant used on the primary side and deionized pure water, ethylene glycol solution, or propylene glycol solution used on the secondary side, and the settings are made according to the ambient temperature, cooling capacity, and / or system antifreeze requirements.

[0025] Preferably, the branch pipes connecting the distributor and collector to each liquid-cooled server are all quick-connect bellows, and the pipes are equipped with flow regulating valves and temperature sensors to monitor and evenly distribute the coolant flow and temperature to each liquid-cooled server in real time, so as to avoid local overheating or uneven flow distribution.

[0026] (III) Technical Effects

[0027] Compared with the prior art, the multi-mode collaborative heat dissipation system for liquid-cooled server racks provided by this utility model has the following technical effects:

[0028] (1) The multi-mode collaborative heat dissipation array server liquid cooling cabinet heat dissipation system of this utility model adopts a heat pipe air conditioner that combines natural cold source and mechanical refrigeration as the outdoor cold source, and provides Freon refrigerant to the primary side of the cold capacity distribution unit. The system is energy-saving and the outdoor pipeline has no risk of freezing and cracking in winter.

[0029] (2) The multi-mode collaborative heat dissipation of the array server liquid-cooled cabinet heat dissipation system of this utility model uses coolant on the secondary side of the cooling distribution unit to directly carry out the heat of the liquid-cooled server in the server liquid-cooled cabinet and transfer the heat to the Freon refrigerant on the primary side. It has a large heat exchange capacity and high heat exchange efficiency, which can significantly reduce the PUE of the data center.

[0030] (3) By constructing a dual-source cooling system with autonomous switching capability, this utility model can dynamically select the operating mode according to the external ambient temperature, achieving energy-saving and efficient heat dissipation under year-round operating conditions. In addition, this utility model has good engineering deployment flexibility and adaptability, and can be widely applied to liquid cooling deployment scenarios of data centers of different climate regions and different sizes. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the multi-mode collaborative heat dissipation system for liquid-cooled server racks of this utility model.

[0032] Figure 2 This is a schematic diagram of the structure when only the heat pipe natural cold source refrigeration circuit is running.

[0033] Figure 3 This is a schematic diagram of the structure when two refrigeration circuits are running simultaneously.

[0034] Figure 4 This is a schematic diagram of the structure when only the compressor mechanical refrigeration circuit is running.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1- Server liquid-cooled cabinet, 1-1 Cabinet body, 1-2 Liquid-cooled server, 1-3 Coolant distribution inlet pipe, 1-3-1 Coolant distribution inlet pipe, 1-4 Coolant distribution outlet pipe, 1-4-1 Coolant quick-connect inlet, 2- Heat pipe air conditioning unit, 2-1 Sheet metal casing, 2-2 Heat pipe condenser, 2-3 Air-cooled condenser, 2-4 Expansion valve, 2-5 Refrigerant evaporator, 2-6 Compressor, 2-7 Outdoor fan, 2-8 Outdoor unit controller, 2-9 Refrigerant inlet three-way valve, 2-10 Refrigerant outlet three-way valve, 2-11 Receiver, 2-12 Refrigerant pump, 3- Cooling capacity distribution unit, 3-1 Intermediate heat exchanger, 3-2 Secondary side liquid inlet pipe, 3-3 Secondary side liquid outlet pipe, 3-4 Coolant pump, 3-5 Distribution unit controller, 4- Distributor, 4-1 5-Liquid collector branch outlet pipe, 5-1 Liquid collector branch inlet pipe, 6-Refrigerant gas pipe, 7-Refrigerant liquid pipe. Detailed Implementation

[0037] To better understand this utility model, the following embodiments further illustrate its content, so that the advantages and features of this utility model can be more easily understood by those skilled in the art. It should be noted that the following descriptions are merely preferred embodiments of this utility model, but the content of this utility model is not limited to the following embodiments.

[0038] Figure 1 This is a schematic diagram of the multi-mode collaborative heat dissipation system for liquid-cooled server racks of this utility model. As shown in the figure, the multi-mode collaborative heat dissipation system for liquid-cooled server racks of this utility model includes two rows of liquid-cooled server racks 1, two cooling capacity distribution units 3, two heat pipe air conditioning units 2, a liquid distributor 4, and a liquid collector 5.

[0039] Each liquid-cooled server rack 1 includes a rack body 1-1, liquid-cooled servers 1-2, coolant distribution inlet pipe 1-3, and coolant distribution outlet pipe 1-4. The coolant distribution inlet pipe 1-3 includes a coolant inlet and multiple coolant quick-connect outlets 1-3-1 leading to each liquid-cooled server 1-2. The coolant distribution outlet pipe 1-4 includes multiple coolant quick-connect inlets 1-4-1 connecting to each liquid-cooled server 1-2 and a coolant outlet. Both cooling capacity distribution units 3 include an intermediate heat exchanger 3-1, a primary-side refrigerant inlet, a primary-side refrigerant outlet, a secondary-side liquid inlet pipe 3-2, and a secondary-side liquid outlet pipe 3-3. On the secondary-side liquid inlet pipe 3-2, two coolant pumps 3-4, one main and one backup, are installed in parallel.

[0040] The dual-heatpipe air conditioning unit 2 includes a heatpipe natural cooling source refrigeration circuit and a compressor mechanical refrigeration circuit. It also includes a sheet metal casing 2-1, an outdoor fan 2-7, an outdoor unit controller 2-8, a refrigerant inlet three-way valve 2-9, and a refrigerant outlet three-way valve 2-10. The heatpipe natural cooling source refrigeration circuit includes a heatpipe condenser 2-2, whose inlet is connected to the first outlet of the refrigerant inlet three-way valve 2-9, and whose outlet is connected to the first inlet of the refrigerant outlet three-way valve 2-10. The compressor mechanical refrigeration circuit includes an air-cooled condenser 2-3, an expansion valve 2-4, and a refrigerant evaporator 2-5. 5. The compressor 2-6 and the connecting pipes between them are connected. The hot-side inlet of the refrigerant evaporator 2-5 is connected to the second outlet of the refrigerant inlet three-way valve 2-9, and the hot-side outlet is connected to the second inlet of the refrigerant outlet three-way valve 2-10. The heat pipe natural cold source refrigeration circuit, the compressor mechanical refrigeration circuit, the outdoor fan 2-7, the controller 2-8, the refrigerant inlet three-way valve 2-9, and the refrigerant outlet three-way valve 2-10 are all installed inside the sheet metal housing 2-1. The inlet of the refrigerant inlet three-way valve 2-9 is connected to the primary side refrigerant outlet of the cooling capacity distribution unit 3 through the refrigerant gas pipe 6. The outlet of the refrigerant outlet three-way valve 2-10 is connected to the primary side refrigerant inlet of the cooling capacity distribution unit 3 through the refrigerant liquid pipe 7. As a preferred option, the heat pipe air conditioning unit 2 is equipped with a liquid receiver 2-11 and a refrigerant pump 2-12 via parallel pipelines at the outlet of the refrigerant three-way valve 2-10. The liquid receiver is used to store and stabilize the refrigerant flow, and the refrigerant pump is used to provide refrigerant circulation power when there is a need for power drive or when greater adjustment is required.

[0041] The distributor 4 includes a distributor inlet and multiple distributor branch outlet pipes 4-1. The distributor inlet is connected to the secondary side liquid outlet pipe 3-3 of the cooling capacity distribution unit 3. Each distributor branch outlet pipe 4-1 leads to each server liquid-cooled cabinet 1 and is connected to a cooling medium inlet of its coolant distribution inlet pipe 1-3. The collector 5 includes multiple collector branch inlet pipes 5-1 and two collector outlets. Each collector branch inlet pipe 5-1 is connected to a coolant outlet of each server liquid-cooled cabinet 1's coolant distribution outlet pipe 1-4. The collector outlet is connected to the secondary side liquid inlet pipe 3-2 of the cooling capacity distribution unit 3.

[0042] The two cooling capacity distribution units 3 each have one main and one backup coolant pump 3-4. When the main coolant pump 3-4 fails, the backup coolant pump 3-4 will automatically start. The two cooling capacity distribution units 3 are arranged at the head, middle or tail of the two rows of server liquid cooling cabinets 1, respectively. Both cooling capacity distribution units 3 are connected to the distributor 4 and collector 5. The two heat pipe air conditioning units 2 are arranged at the head, middle or tail of the two rows of server liquid cooling cabinets 1, respectively. They are connected to the two backup cooling capacity distribution units 3 through the refrigerant gas pipe 6 and the refrigerant liquid pipe 7.

[0043] The heat pipe air conditioning unit 2 also includes monitoring components such as temperature sensors and pressure sensors. The outdoor unit controller 2-8 can adjust the operating mode and operating status of the heat pipe air conditioning unit 2 and the operating status of the outdoor fan 2-7 based on the monitoring data and upload it to the upper monitoring system. Each of the two cooling capacity distribution units 3 includes a distribution unit controller 3-5, multiple temperature and humidity sensors, multiple pressure sensors, multiple leakage sensors, and an automatic pressure relief device. The distribution unit controller 3-5 can monitor the primary side inlet / outlet refrigerant temperature, secondary side supply / return liquid temperature, secondary side supply / return liquid pressure, whether the unit has leakage, and the temperature and humidity of the machine room environment. It can adjust the speed and start / stop of the coolant pump 3-4 according to the load and actual operating requirements, and activate the automatic pressure relief device when the secondary side coolant pressure is high. When the unit has leakage or the monitored temperature and pressure exceed the limit, an alarm is issued and uploaded to the upper monitoring system. In addition, as a preferred option, the intermediate heat exchanger is a plate heat exchanger or a shell and tube heat exchanger, and the working fluid in the primary side system consisting of the two heat pipe air conditioning unit 2 and the two cooling capacity distribution units 3 is a Freon refrigerant; the working fluid in the secondary side system consisting of the two cooling capacity distribution units 3 and the two rows of server liquid cooling cabinets 1 can be deionized pure water, ethylene glycol solution, propylene glycol solution, etc.

[0044] Figure 2 This is a schematic diagram of the structure when only the heat pipe natural cold source refrigeration circuit is operating. As shown in the figure, the heat pipe air conditioning unit 2 selects the operating circuit according to the outdoor cold source supply. During the cold winter season, when the outdoor natural cold source is sufficient, only the heat pipe natural cold source refrigeration circuit operates. At this time, the heat pipe natural cold source refrigeration circuit provides the outdoor cold source solely for the cooling capacity distribution unit 3. The flow direction of the primary side refrigerant in the heat pipe air conditioning unit 2, refrigerant liquid pipe 7, cooling capacity distribution unit 3, and refrigerant gas pipe 6 is shown by arrow B in the figure. The heat from each liquid-cooled server 1-2 in the row of liquid-cooled server racks 1 is collected in the secondary side water of the liquid collector 5 and flows back to the cooling capacity distribution unit 3 for cooling. After cooling, the secondary side water enters the distributor 4 and is then distributed to each liquid-cooled server 1-2 in each liquid-cooled server rack 1 to absorb heat again, thereby discharging the heat out of the server room. The flow direction of the secondary side coolant is shown by arrow A in the figure.

[0045] Figure 3This is a schematic diagram of the structure for simultaneous operation of the heat pipe natural cooling source refrigeration circuit and the compressor mechanical refrigeration circuit. As shown in the figure, the heat pipe air conditioning unit 2 selects the operating circuit according to the outdoor cooling source supply. During the spring and autumn transition seasons, when the outdoor natural cooling source can provide some cooling capacity, the heat pipe natural cooling source refrigeration circuit and the compressor mechanical refrigeration circuit operate simultaneously. At this time, the heat pipe natural cooling source refrigeration circuit and the compressor mechanical refrigeration circuit together provide the outdoor cooling source for the cooling capacity distribution unit 3. The flow direction of the primary side refrigerant in the heat pipe air conditioning unit 2, refrigerant liquid pipe 7, cooling capacity distribution unit 3, and refrigerant gas pipe 6 is shown by arrow C in the figure; the flow direction of the refrigerant in the air-cooled condenser 2-3, expansion valve 2-4, refrigerant evaporator 2-5, compressor 2-6, and the connecting pipes between the four in the compressor mechanical refrigeration circuit is shown by arrow E in the figure. The heat from each liquid-cooled server 1-2 in the liquid-cooled server rack 1 is collected in the secondary coolant of the collector 5 and flows back to the cooling distribution unit 3 for cooling. After cooling, the secondary coolant enters the distributor 4 and is then distributed to each liquid-cooled server 1-2 in each liquid-cooled server rack 1 to absorb heat again, thereby dissipating the heat from the server room. The flow direction of the secondary coolant is shown by arrow A in the figure.

[0046] Figure 4 This is a schematic diagram of the structure when only the compressor mechanical refrigeration circuit is operating. As shown in the figure, the heat pipe air conditioning unit 2 selects the operating circuit based on the outdoor cooling source. During the hot summer season, when the outdoor natural cooling source cannot provide cooling, only the compressor mechanical refrigeration circuit operates. At this time, the compressor mechanical refrigeration circuit provides an outdoor cold source for the cooling capacity distribution unit 3. The flow direction of the primary side refrigerant in the heat pipe air conditioning unit 2, refrigerant liquid pipe 7, cooling capacity distribution unit 3, and refrigerant gas pipe 6 is shown by arrow D in the figure. The flow direction of the refrigerant in the air-cooled condenser 2-3, expansion valve 2-4, refrigerant evaporator 2-5, compressor 2-6, and the connecting pipes between them in the compressor mechanical refrigeration circuit is shown by arrow E in the figure. The heat from each liquid-cooled server 1-2 in the liquid-cooled server rack 1 is collected in the secondary side coolant of the collector 5 and flows back to the cooling capacity distribution unit 3 for cooling. After cooling, the secondary side coolant enters the distributor 4 and is then distributed to each liquid-cooled server 1-2 in each liquid-cooled server rack 1 to absorb heat again, thereby discharging the heat out of the computer room. The flow direction of the secondary side water is shown by arrow A in the figure.

[0047] The objectives of this utility model are fully and effectively achieved through the above embodiments. All equivalent or simple variations made to the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, all of which should fall within the protection scope of this utility model.

Claims

1. A multi-mode cooperative heat dissipation in-line server liquid cooling cabinet heat dissipation system, characterized in that, The server liquid cooling cabinet is arranged in two columns, each column has multiple server liquid cooling cabinets arranged closely, and at least one liquid cooling server is arranged in each cabinet. The cold distribution unit is arranged in two sets, one standby and one in use, and is arranged at the head, middle or tail of each column of server liquid cooling cabinets. Each cold distribution unit comprises an intermediate heat exchanger, and the intermediate heat exchanger comprises a primary side and a secondary side. The primary side is connected to the refrigerant, and the secondary side is connected to the cooling liquid. The distributor comprises two inlets and multiple outlets. The two inlets are respectively connected to the secondary side outlets of the two intermediate heat exchangers, and each outlet is respectively connected to the cooling liquid inlet of each liquid cooling server. The liquid collector comprises multiple inlets and two outlets. Each inlet is respectively connected to the cooling liquid outlet of each liquid cooling server, and the two outlets are respectively connected to the secondary side inlets of the two intermediate heat exchangers. The heat pipe air conditioner all-in-one machine is arranged in two sets, one standby and one in use, and is respectively connected to one intermediate heat exchanger. Each set comprises a heat pipe natural cold source refrigeration circuit and a compressor mechanical refrigeration circuit. The two circuits are connected in parallel at the secondary side of the corresponding intermediate heat exchanger and are selected to operate independently or cooperatively through a valve assembly to provide a cold source for the corresponding secondary side. Each heat pipe air conditioner all-in-one machine further comprises an inlet refrigerant three-way valve and an outlet refrigerant three-way valve. The inlet of the inlet refrigerant three-way valve is connected to the primary side outlet of the corresponding intermediate heat exchanger, and the outlet of the outlet refrigerant three-way valve is connected to the primary side inlet of the corresponding intermediate heat exchanger. The heat pipe natural cold source refrigeration circuit comprises a heat pipe condenser. The inlet of the heat pipe condenser is connected to the first outlet of the inlet refrigerant three-way valve, and the outlet of the heat pipe condenser is connected to the first inlet of the outlet refrigerant three-way valve. The compressor mechanical refrigeration circuit comprises an air-cooled condenser, an expansion valve, a refrigerant evaporator, a compressor and connecting pipelines therebetween. The hot side inlet of the refrigerant evaporator is connected to the second outlet of the inlet refrigerant three-way valve, and the hot side outlet is connected to the second inlet of the outlet refrigerant three-way valve.

2. The multi-mode synergistic heat dissipation in-line server liquid-cooled cabinet heat dissipation system of claim 1, wherein, A reservoir and a refrigerant pump are arranged in parallel on the connecting pipeline between the outlet of each outlet refrigerant three-way valve and the primary side inlet of the corresponding intermediate heat exchanger. The reservoir is used to store and stabilize the refrigerant flow, and the refrigerant pump is used to provide refrigerant circulation power when there is a power driving demand or when the system needs to be adjusted.

3. The multi-mode synergistic liquid-cooled server-in-row cabinet cooling system of claim 2, wherein, Each heat pipe air conditioner all-in-one machine further comprises a sheet metal shell and an outdoor fan. The heat pipe natural cold source refrigeration circuit, the compressor mechanical refrigeration circuit, the outdoor fan, the inlet refrigerant three-way valve and the outlet refrigerant three-way valve are all installed in the sheet metal shell.

4. The multi-mode synergistic row server liquid-cooled cabinet cooling system of claim 2 or 3, wherein, The heat pipe air conditioner all-in-one machine further comprises an outdoor unit controller, a temperature sensor and a pressure sensor which are arranged in the sheet metal shell and are in communication connection. The outdoor unit controller dynamically controls the operation mode of the heat pipe air conditioner all-in-one machine and the operation state of the outdoor fan according to the monitored outdoor temperature and refrigerant pipeline pressure data and according to a preset logic.

5. The multi-mode synergistic row server liquid-cooled cabinet heat dissipation system of claim 4, wherein, ​ 6. The multi-mode synergistic liquid-cooled server rack cooling system of claim 1, wherein, The heat pipe air conditioner all-in-one machine selects a running circuit according to the outdoor cold source providing condition: when the outdoor natural cold source is sufficient, only the heat pipe natural cold source refrigeration circuit is run; when the outdoor natural cold source can provide part of cold quantity, the heat pipe natural cold source refrigeration circuit and the compressor mechanical refrigeration circuit are simultaneously run; when the outdoor natural cold source cannot provide cold quantity, only the compressor mechanical refrigeration circuit is run.

7. The multi-mode synergistic row server liquid-cooled cabinet heat dissipation system of claim 1, wherein, A main and a standby cooling liquid pump are installed in parallel on the secondary side inlet or outlet pipeline of each intermediate heat exchanger, and when the main cooling liquid pump fails or the flow in the secondary side cooling liquid circulation loop is lower than a preset threshold, the standby cooling liquid pump is switched to run; the cooling liquid pump is controlled by frequency conversion, and its rotating speed is adjusted according to the system load.

8. The multi-mode synergistic liquid-cooled server rack cooling system according to claim 7, wherein, Each cooling capacity distribution unit is provided with a distribution unit controller and a temperature and humidity sensor, a pressure sensor, a liquid leakage sensor and an automatic pressure relief device which are in communication connection with the distribution unit controller, respectively used for monitoring the computer room environment temperature and humidity, the primary side in / out refrigerant temperature, the secondary side supply / back cooling liquid temperature, the secondary side supply / back cooling liquid pressure, whether the unit has liquid leakage, opening the automatic pressure relief device when the cooling liquid circulation pressure exceeds the limit value, and adjusting the rotating speed and start / stop of the cooling liquid pump according to the load and operation demand, issuing an alarm and uploading to the upper monitoring system when liquid leakage or monitored temperature and pressure exceed the limit value.

9. The multi-mode synergistic liquid-cooled server rack cooling system according to claim 1, wherein, The intermediate heat exchanger adopts a plate heat exchanger or a shell and tube heat exchanger, the primary side operating medium adopts freon refrigerant, the secondary side operating medium adopts deionized pure water, ethylene glycol solution or propylene glycol solution, and is set according to the environmental temperature, cooling capacity and / or system anti-freezing demand.

10. The multi-mode synergistic heat dissipation in-line server liquid cooling cabinet heat dissipation system of claim 1, wherein, The branch pipelines connected with the liquid cooling servers of the distributor and the liquid collector all adopt quick-connection corrugated pipes, and flow regulating valves and temperature sensors are installed on the pipelines, used for monitoring and balancing the cooling liquid flow and temperature distributed to each liquid cooling server in real time.

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