Stacked CDU device

Abstract

The invention discloses a stacked CDU device which comprises a base CDU, a plurality of stacked CDUs and an electric control module, the electric control module is arranged on the side wall of the base CDU, and the base CDU comprises a primary flow path, a secondary flow path, a first plate heat exchanger, a mechanical pump and a first frame body; the plurality of stacking units CDU comprise a single-table type stacking type CDU, a two-table type stacking type CDU or a multi-table type stacking type CDU; the electric control module comprises a control mainboard, a control panel screen and a switching power supply. The optimal refrigeration effect can be achieved in a limited space, and meanwhile flexible stacking is achieved according to different power requirements. The stacked CDU device can be widely applied to the technical field of liquid cooling.

Description

Technical Field

[0001] This invention relates to the field of liquid cooling technology, and more particularly to a stacked CDU device. Background Technology

[0002] With the explosive growth of artificial intelligence, large-scale model training, and high-performance computing, the power consumption of a single rack has risen rapidly. In many cases, traditional air cooling can no longer meet the heat dissipation requirements, and liquid cooling has quickly become an essential option for data center construction. However, existing liquid cooling distribution units (CDUs) exhibit a "two-tiered" form factor: rack-mounted CDUs are limited by the compact space of 1U-4U, and the power of a single unit is usually limited to 60 kW. When the rack power consumption increases further, multiple units can only be connected in parallel, which not only occupies valuable rack space but also brings intricate secondary-side hoses and difficulties in synchronizing flow and temperature control; rack-mounted CDUs, although they can provide centralized cooling capacity of 200 kW or even 800 kW, require independent placement, occupy a large area, and have high requirements for the height of the data center and primary-side piping. The initial investment is heavy, and the expansion cycle is long, making them unfriendly to phased deployment or edge scenarios. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a stackable CDU device that can achieve optimal cooling performance within a limited space, while also enabling flexible stacking according to different power requirements.

[0004] The first technical solution adopted in this invention is: a stacked CDU device, comprising a base CDU, a plurality of stacked unit CDUs, and an electronic control module, wherein the electronic control module is disposed on the side wall of the base CDU, wherein: The base CDU includes a primary flow path, a secondary flow path, a first plate heat exchanger, a mechanical pump, and a first frame. The primary flow path, the secondary flow path, the first plate heat exchanger, and the mechanical pump are all located within the first frame. The aforementioned stacked units (CDUs) include single-unit stacked CDUs, two-unit stacked CDUs, or multiple-unit stacked CDUs. The electronic control module includes a control motherboard, a control board screen, and a switching power supply.

[0005] Furthermore, the primary flow path specifically includes a primary side inlet, a first temperature sensor, a first electrically operated three-way regulating valve, a first plate heat exchanger inlet, a first plate heat exchanger outlet, a second electrically operated three-way regulating valve, a second temperature sensor, and a primary side outlet. The primary side inlet, the first temperature sensor, the first electrically operated three-way regulating valve, the first plate heat exchanger inlet, the first plate heat exchanger outlet, the second electrically operated three-way regulating valve, the second temperature sensor, and the primary side outlet are sequentially arranged along the working fluid flow direction, wherein: The first temperature sensor is used to monitor the working fluid temperature at the primary side inlet; The second temperature sensor is used to monitor the working fluid temperature at the primary side outlet.

[0006] Furthermore, the secondary flow path specifically includes a secondary side inlet, an ultraviolet lamp, a third temperature sensor, a conductivity sensor, a first pressure sensor, a third electric three-way regulating valve, a second pressure sensor, a parallel branch, a second plate heat exchanger inlet, a second plate heat exchanger outlet, a fourth electric three-way regulating valve, a third pressure sensor, a fourth temperature sensor, an electromagnetic flowmeter, and a secondary side outlet. The secondary side inlet, the ultraviolet lamp, the third temperature sensor, the conductivity sensor, the first pressure sensor, the third electric three-way regulating valve, the second pressure sensor, the parallel branch, the second plate heat exchanger inlet, the second plate heat exchanger outlet, the fourth electric three-way regulating valve, the third pressure sensor, the fourth temperature sensor, the electromagnetic flowmeter, and the secondary side outlet are arranged sequentially along the working fluid flow direction, wherein: The ultraviolet lamp is used to disinfect the working fluid; The third temperature sensor is used to monitor the working fluid temperature at the secondary side inlet; The fourth temperature sensor is used to monitor the working fluid temperature at the secondary side outlet. The conductivity sensor is used to monitor the conductivity of the working fluid and determine whether the base CDU needs to be replaced. The second pressure sensor is used to monitor the internal pressure of the pipe between the secondary side inlet and the inlet of the second plate heat exchanger; The third pressure sensor is used to monitor the internal pressure of the pipe between the outlet of the second plate heat exchanger and the secondary side outlet. The first pressure sensor is used to monitor the internal pressure of the main pipeline after stacking; The electromagnetic flowmeter is used to monitor the flow rate inside the secondary flow path pipeline.

[0007] Furthermore, the parallel branch specifically includes a first branch and a second branch. Both the first and second branch include a mechanical pump, a ball valve, a Y-type filter, and a check valve. The mechanical pump, the ball valve, the Y-type filter, and the check valve are arranged sequentially along the working fluid flow direction, wherein: The mechanical pump is used to facilitate the flow of the working fluid; The ball valve is used to cut off the flow of the working fluid; The Y-type filter is used to filter impurities in the working fluid; The one-way valve is used to control the unidirectional flow of the working fluid.

[0008] Furthermore, the first frame is provided with a first storage area, the control motherboard is located inside the first storage area and is used for signal acquisition and status perception of the stacked CDU, the control board screen is located outside the first storage area and is used by the staff to view the real-time status of the stacked CDU and perform operation control, and the switching power supply is located in the first storage area and is used to power the mechanical pump.

[0009] Furthermore, when the stacking unit CDU is a two-unit stacked CDU, the frame size of the base CDU and the stacking unit CDU is the same. When stacked, the primary side inlet and primary side outlet of the upper stacking unit CDU coincide with the primary side branch inlet and primary side branch outlet of the lower base CDU. The secondary side inlet and secondary side outlet of the upper stacking unit CDU coincide with the secondary side branch inlet and secondary side branch outlet of the lower base CDU. The pipelines between the base CDU and the stacking unit CDU are connected by flanges.

[0010] Furthermore, the operation modes of the two stacked CDUs include single-operation base CDU and simultaneous operation of base CDU and stacked unit CDU, wherein: For a single-operation base CDU, the first, second, third, and fourth electric three-way regulating valves of the base CDU are all only connected to the E and F ends. For simultaneous operation of the base CDU and the stacking unit CDU, the E, F and G terminals of the first, second, third and fourth electric three-way regulating valves of the base CDU are all connected, while the F and G terminals of the fifth, sixth, seventh and eighth electric three-way regulating valves of the stacking unit CDU are only connected.

[0011] Furthermore, when the stacked unit CDU is a multi-unit stacked CDU, it is composed of a base CDU and multiple stacked unit CDUs stacked together. The multiple stacked unit CDUs are of the same size. When multiple stacked unit CDUs are stacked, the primary side inlet and primary side outlet of the upper stacked unit CDU coincide with the primary side branch inlet and primary side branch outlet of the lower stacked unit CDU. The secondary side inlet and secondary side outlet of the upper stacked unit CDU coincide with the secondary side branch inlet and secondary side branch outlet of the lower stacked unit CDU. The pipelines between the stacked unit CDUs are connected by flanges.

[0012] Furthermore, the operation modes of the multi-unit stacked CDU include single-operation base CDU, simultaneous operation of base CDU and lower stacked units, and simultaneous operation of base CDU and multiple stacked units, wherein: For a single-operation base CDU, the first, second, third, and fourth electric three-way regulating valves of the base CDU are all only connected to the E and F ends. For simultaneous operation of the base CDU and the lower stacking unit, the E, F and G terminals of the first, second, third and fourth electric three-way regulating valves of the base CDU are all connected, while the fifth, sixth, seventh and eighth electric three-way regulating valves of the lower stacking unit CDU are only connected to the F and G terminals. For simultaneous operation of the base CDU and multiple stacked units, the E, F, and G terminals of the first, second, third, and fourth electric three-way regulating valves of the base CDU, as well as the fifth, sixth, seventh, and eighth electric three-way regulating valves of the lower stacked unit CDU, are all connected. The F and G terminals of the ninth, tenth, eleventh, and twelfth electric three-way regulating valves of the upper stacked unit CDU are only connected.

[0013] The beneficial effects of this invention are as follows: This invention achieves the vertical stacking of several CDUs with the same or different power levels above the CDU by modifying its structure. The base CDU and the stacked CDUs share the primary side, and the secondary side flow is uniformly allocated internally; CDUs with different power levels can be freely combined to achieve "on-demand stacking and online capacity expansion". When other power requirements arise, there is no need to redevelop CDUs with different power levels; power matching can be achieved simply by adding or removing existing standard modules, which saves development time and costs, and allows for smooth expansion of system capacity without shutdown. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a stacked CDU device according to the present invention; Figure 2 This is a schematic diagram of the base CDU system provided in a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the stacked unit CDU system provided in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the principle of a two-unit stacked CDU system provided in a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the principle of a three-unit stacked CDU system provided in a specific embodiment of the present invention.

[0015] Reference numerals: 1. Base CDU; 2. Stacking Unit CDU; 3. Primary Flow Path; 301. Primary Side Inlet A; 302. Primary Side Outlet A; 303. Primary Side Branch Inlet a; 304. Primary Side Branch Outlet a; 305. Primary Side Inlet C; 306. Primary Side Outlet C; 307. Primary Side Branch Inlet c; 308. Primary Side Branch Outlet c; 4. Secondary Flow Path; 401. Secondary Side Inlet B; 402. Secondary Side Outlet B; 403. Secondary Side Branch Inlet b; 404. Secondary Side Branch Outlet b; 405. Ultraviolet Lamp; 40 6. Conductivity sensor; 407. Ball valve; 408. Y-type filter; 409. Check valve; 410. EPDM hose; 411. Electromagnetic flowmeter; 412. Secondary side inlet D; 413. Secondary side outlet D; 414. Secondary side branch inlet d; 415. Secondary side branch outlet d; 5. First plate heat exchanger; 51. First plate heat exchanger inlet A; 52. First plate heat exchanger outlet A; 53. First plate heat exchanger inlet B; 54. First plate heat exchanger outlet B; 55. Second plate heat exchanger; 56. Second plate heat exchanger inlet A; 57. Second plate heat exchanger outlet A; 58. Second plate heat exchanger inlet B; 59. Second plate heat exchanger outlet B; 6. Mechanical pump; 7. First frame; 71. First storage area; 72. Second frame; 73. Second storage area; 8. Electrical control module; 81. Control main board; 82. Control board screen; 83. Switching power supply; 9. First temperature sensor; 91. Second temperature sensor; 92. Third temperature sensor; 93. Fourth temperature sensor; 10. First electric three-way regulating valve; 101. Second electric three-way regulating valve; 102. 103. Electric three-way control valve; 104. Electric three-way control valve; 105. Electric three-way control valve; 106. Electric three-way control valve; 107. Electric three-way control valve; 108. Electric three-way control valve; 109. Electric three-way control valve; 1010. Electric three-way control valve; 1011. Electric three-way control valve; 11. First pressure sensor; 111. Second pressure sensor; 112. Third pressure sensor; 113. Fourth pressure sensor; 12. Flange. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only for ease of explanation and do not limit the order of the steps. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.

[0017] First, it should be noted that this invention proposes a stacked CDU, which achieves vertical stacking of several CDUs with the same or different power levels by modifying the CDU structure. The base CDU and the stacked CDUs share the primary side, and the secondary side flow is uniformly allocated internally; CDUs of different power levels can be freely combined to achieve "on-demand stacking and online capacity expansion." More importantly, when other power requirements arise, there is no need to redevelop CDUs with different power levels; power matching can be achieved simply by adding or removing existing standard modules. This saves on R&D cycle and cost, and allows for smooth expansion of system capacity without downtime, providing a scalable, low-risk, and cost-effective liquid cooling path for next-generation high-power-density data centers.

[0018] Reference Figure 1 The present invention provides a stacked CDU device, including a base CDU, a plurality of stacked unit CDUs and an electronic control module, wherein the electronic control module is disposed on the side wall of the base CDU.

[0019] First, in this embodiment, a stacked CDU is provided, including a base CDU1, several stacked units CDU2, and an electrical control module 8 installed on the base CDU1.

[0020] Furthermore, such as Figure 2 As shown, a base CDU includes a primary flow path 3, a secondary flow path 4, a first plate heat exchanger 5, a mechanical pump 6, and a first frame 7. The primary flow path 3, along the working fluid flow direction, sequentially passes through a primary side inlet A301, a first temperature sensor 9, a first electric three-way regulating valve 10, a first plate heat exchanger inlet A51, a first plate heat exchanger outlet A52, a second electric three-way regulating valve 101, and a second temperature sensor 91 until it reaches the primary side outlet A302. The first temperature sensor 9 and the second temperature sensor 91 are used to monitor the temperature of the working fluid at the primary side inlet and outlet in real time, respectively. The first electric three-way regulating valve 10 and the second electric three-way regulating valve 101 are respectively connected to a primary side branch inlet a303 and a primary side branch outlet a304 via pipes, for connection to the primary side inlet and outlet of the stacked unit CDU2.

[0021] Secondary flow path 4, along the direction of working fluid flow, sequentially passes through secondary side inlet B401, ultraviolet lamp 405, third temperature sensor 92, conductivity sensor 406, first pressure sensor 11, third electric three-way regulating valve 102, and second pressure sensor 111. It then connects to two parallel branches, each branch sequentially connected to two mechanical pumps 6, two ball valves 407, two Y-type filters 408, and two check valves 409. The inlet and outlet pipes of the mechanical pumps 6 are connected by EPDM flexible hoses 410 for easy disassembly and installation. The ball valves 407 are used to cut off the working fluid flow. Clean or replace the Y-type filter 408, which is used to filter impurities in the working fluid and improve heat exchange efficiency. The one-way valve 409 is used to prevent the working fluid from flowing into the other branch when the mechanical pump 6 is driven on one branch. The two branches take turns running when the base CDU1 is running, which extends the service life of the base CDU1. Then the working fluid passes through the inlet B53 of the second plate heat exchanger, the outlet B54 of the second plate heat exchanger, the fourth electric three-way regulating valve 103, the third pressure sensor 112, the fourth temperature sensor 93, the electromagnetic flowmeter 411 and finally to the secondary side outlet B402.

[0022] The ultraviolet lamp 405 is used for disinfection of the working fluid to eliminate microorganisms. The third temperature sensor 92 and the fourth temperature sensor 93 are used to monitor the temperature of the working fluid at the secondary side inlet and outlet in real time, respectively. The conductivity sensor 406 monitors the conductivity of the working fluid, and the monitoring data is used to determine whether the base CDU1 needs fluid replacement. The second pressure sensor 111 monitors the internal pressure of the pipe between the secondary side inlet B401 and the inlet B53 of the first plate heat exchanger, used to determine whether the mechanical pump 6 is operating normally and whether the Y-type filter 408 is clogged. The third pressure sensor 112... The first pressure sensor 11 is used to monitor the internal pressure of the pipeline between the outlet B54 of the first plate heat exchanger and the secondary side outlet B402; the first pressure sensor 11 is used to monitor the internal pressure of the main pipeline after stacking, and compare it with the internal pressure of each branch pipeline to facilitate the location of the fault; the electromagnetic flowmeter 411 is used to monitor the internal flow of the secondary flow path 4 pipeline in real time; the third electric three-way regulating valve 102 and the fourth electric three-way regulating valve 103 are respectively connected to the secondary side branch inlet b403 and the secondary side branch outlet b404 through pipelines, and are used to connect to the secondary side inlet and outlet of the stacking unit CDU2.

[0023] The first frame 7 has a first storage area 71, which is a rectangular space with length, width, and height. The length extends horizontally, the width extends front-to-back, and the height extends vertically. The electronic control module 8 includes a control motherboard 81, a control board screen 82, and a switching power supply 83. The control motherboard 81 is located inside the first storage area 71 and is used for signal acquisition and status sensing of the stacked CDU. The control board screen 82 is located outside the first storage area 71, allowing operators to easily view the real-time status of the stacked CDU and perform operational control. The switching power supply 83 is located inside the first storage area 71 and is used to power the mechanical pump 6.

[0024] The base CDU includes a primary flow path, a secondary flow path, a first plate heat exchanger, a mechanical pump, and a first frame. The primary flow path, the secondary flow path, the first plate heat exchanger, and the mechanical pump are all located within the first frame. The aforementioned stacked units (CDUs) include single-unit stacked CDUs, two-unit stacked CDUs, or multiple-unit stacked CDUs. The electronic control module includes a control motherboard, a control board screen, and a switching power supply.

[0025] In this embodiment, as Figure 3 As shown, a stacked unit CDU2 includes a primary flow path 3, a secondary flow path 4, a second plate heat exchanger 55, a mechanical pump 6, and a second frame 72. The primary flow path 3, along the working fluid flow direction, sequentially passes through a primary side inlet C305, a fifth electric three-way regulating valve 104, a second plate heat exchanger inlet A56, a second plate heat exchanger outlet A57, a sixth electric three-way regulating valve 105, and finally reaches the primary side outlet C306. The fifth electric three-way regulating valve 104 and the sixth electric three-way regulating valve 105 are respectively connected to a primary side branch inlet c307 and a primary side branch outlet c308 via pipelines, for connection to the primary side inlet and outlet of the stacked unit CDU2.

[0026] Secondary flow path 4 passes sequentially along the working fluid flow direction through secondary side inlet D412, seventh electric three-way regulating valve 106, and fourth pressure sensor 113. It then connects to two parallel branches, each connected sequentially to two mechanical pumps 6, two ball valves 407, two Y-type filters 408, and two check valves 409. The inlet and outlet pipes of the mechanical pumps 6 are connected by EPDM flexible hoses 410, facilitating disassembly and installation. The ball valves 407 are used to cut off the working fluid flow to clean or replace the Y-type filters 408, which filter impurities in the working fluid and improve heat exchange efficiency. The check valves 409 prevent the working fluid from flowing into the other branch when one branch's mechanical pump 6 is driven. The two branches alternate operation during the operation of stack unit CDU2, extending the service life of stack unit CDU2. Subsequently, the working fluid passes through the second plate heat exchanger inlet B58, the second plate heat exchanger outlet B59, the eighth electric three-way regulating valve 107, and finally to the secondary side outlet D413.

[0027] The fourth pressure sensor 113 monitors the internal pressure of the pipeline between the secondary side inlet D412 and the inlet B58 of the second plate heat exchanger, and is used to determine whether the mechanical pump 6 is operating normally and whether the Y-type filter 408 is blocked; the seventh electric three-way regulating valve 106 and the eighth electric three-way regulating valve 107 are respectively connected to the secondary side branch inlet d414 and the secondary side branch outlet d415 through pipelines, and are used to connect to the secondary side inlet and outlet of the stacked unit CDU2.

[0028] The second frame 72 has a second storage area 73, which is a rectangular space with length, width and height. The length extends in the left and right direction, the width extends in the front and back direction and the height extends in the up and down direction. The switching power supply 83 is located in the second storage area 73 and is used to supply power to the mechanical pump 6.

[0029] Furthermore, the two-unit stacked CDU and the multi-unit stacked CDU specifically provided in the embodiments of the present invention will be described in detail below: First, for two stacked CDUs: like Figure 4 As shown, the base CDU1 and the stacking unit CDU2 have the same frame size. When stacked, the primary side inlet C305 and primary side outlet C306 of the upper stacking unit CDU2 coincide with the primary side branch inlet a303 and primary side branch outlet a304 of the lower base CDU1. The secondary side inlet D412 and secondary side outlet D413 of the upper stacking unit CDU2 coincide with the secondary side branch inlet b403 and secondary side branch outlet b404 of the lower base CDU1. All overlapping pipe connections are aligned and fixedly connected by flange 12, thus completing one stacking and forming two stacked CDUs.

[0030] When only the base CDU1 is operating in the two stacked CDUs, the first electric three-way regulating valve 10, the second electric three-way regulating valve 101, the third electric three-way regulating valve 102, and the fourth electric three-way regulating valve 103 of the base CDU1 are all connected only to valves E and F. In the base CDU1, the working fluid in primary flow path 3 flows in from the primary side inlet A301, passes through the first electric three-way regulating valve 10, flows only to the first plate heat exchanger 5, and then passes through the second electric three-way regulating valve 101 to reach the primary side outlet A302. In the base CDU1, the working fluid in secondary flow path 4 flows in from the secondary side inlet B401, passes through the third electric three-way regulating valve 102, flows only to the first plate heat exchanger 5, and then passes through the fourth electric three-way regulating valve 103 to reach the secondary side outlet B402.

[0031] When the two stacked CDUs operate simultaneously, the base CDU1 and the stacked unit CDU2, the first electric three-way regulating valve 10, the second electric three-way regulating valve 101, the third electric three-way regulating valve 102 and the fourth electric three-way regulating valve 103 of the base CDU1 are all connected with their E, F and G valves connected, while the fifth electric three-way regulating valve 104, the sixth electric three-way regulating valve 105, the seventh electric three-way regulating valve 106 and the eighth electric three-way regulating valve 107 of the stacked unit CDU2 are all connected with their F and G valves connected.

[0032] In the primary flow path 3 of the base CDU1, the working fluid flows in from the primary side inlet A301, passes through the first electric three-way regulating valve 10, flows to the primary side branch inlet a303 and the first plate heat exchanger 5, and then passes through the second electric three-way regulating valve 101 to reach the primary side outlet A302. At the same time, in the primary flow path 3 of the stacked unit CDU2, the working fluid from the primary side branch inlet a303 of the base CDU1 flows in from the primary side inlet C305 of the stacked unit CDU2, passes through the fifth electric three-way regulating valve 104, flows only to the second plate heat exchanger 55, passes through the sixth electric three-way regulating valve 105 to reach the primary side outlet C306, then flows into the primary side branch outlet a304 of the base CDU1, and passes through the second electric three-way regulating valve 101 to reach the primary side outlet A302.

[0033] In the secondary flow path 4 of the base CDU1, the working fluid flows in from the secondary side inlet B401, passes through the third electric three-way regulating valve 102, flows to the secondary side branch inlet b403 and the first plate heat exchanger 5, and then passes through the fourth electric three-way regulating valve 103 to reach the secondary side outlet B402. At the same time, in the secondary flow path 4 of the stacked unit CDU2, the working fluid from the secondary side branch inlet b403 of the base CDU1 flows in from the primary side inlet D412 of the stacked unit CDU2, passes through the seventh electric three-way regulating valve 106, flows only to the second plate heat exchanger 55, passes through the eighth electric three-way regulating valve 107 to reach the secondary side outlet D413, then flows into the primary side branch outlet b404 of the base CDU1, and passes through the fourth electric three-way regulating valve 103 to reach the secondary side outlet B402.

[0034] Secondly, for two stacked CDUs: like Figure 5 As shown, when there are three or more stacked CDUs, they are composed of a base CDU1 at the bottom and multiple stacking units CDU2. The frame dimensions and internal structure of all stacking units CDU2 are the same, but the internal structure and composition can be changed according to actual needs. When multiple stacking units CDU2 are stacked, the primary side inlet C305 and primary side outlet C306 of the upper stacking unit CDU2 coincide with the primary side branch inlet c307 and primary side branch outlet c308 of the lower stacking unit CDU2. The secondary side inlet D412 and secondary side outlet D413 of the upper stacking unit CDU2 coincide with the secondary side branch inlet d414 and secondary side branch outlet d415 of the lower stacking unit CDU2. All overlapping pipe connections are also aligned and fixedly connected by flange 12, thus completing the second stacking and forming a three-unit stacked CDU.

[0035] When only the base CDU1 is operating in the three-unit stacked CDU configuration, the first electric three-way regulating valve 10, the second electric three-way regulating valve 101, the third electric three-way regulating valve 102, and the fourth electric three-way regulating valve 103 of the base CDU1 are all connected only to valves E and F. At this time, the working fluid in the secondary flow path is pumped by the mechanical pump 6 of the base CDU1 to the server cold plate to absorb heat. Then, the working fluid flows back to the first plate heat exchanger 5 and exchanges heat with the working fluid in the primary flow path 3. Subsequently, the working fluid in the primary flow path 3 flows into an external cold source for heat dissipation, while the working fluid in the secondary flow path 4 is pumped back to the server cold plate to absorb heat, forming a closed-loop heat exchange system for a single CDU.

[0036] When the three stacked CDUs operate simultaneously, with the base CDU1 and the lower stacked unit CDU2 running, valves E, F, and G of the first electric three-way regulating valve 10, the second electric three-way regulating valve 101, the third electric three-way regulating valve 102, and the fourth electric three-way regulating valve 103 of the base CDU1 are all connected. Meanwhile, valves F and G of the fifth electric three-way regulating valve 104, the sixth electric three-way regulating valve 105, the seventh electric three-way regulating valve 106, and the eighth electric three-way regulating valve 107 of the lower stacked unit CDU2 are only connected. At this time, the working fluid in the secondary flow path is pumped by the mechanical pumps 6 of the base CDU1 and the lower stacked unit CDU2 to the server cold plate to absorb heat. Then, the working fluid flows back to the first plate heat exchanger 5 and the second plate heat exchanger 55 to exchange heat with the working fluid in the primary flow path 3. Subsequently, the working fluid in the primary flow path 3 flows into an external cold source for heat dissipation, while the working fluid in the secondary flow path 4 is pumped back to the server cold plate to absorb heat, forming a closed-loop heat exchange system for the two CDUs.

[0037] When the three stacked CDUs operate simultaneously, the base CDU1 and the two stacked unit CDU2, the first electric three-way regulating valve 10, the second electric three-way regulating valve 101, the third electric three-way regulating valve 102, and the fourth electric three-way regulating valve 103 of the base CDU1, and the fifth electric three-way regulating valve 104, the sixth electric three-way regulating valve 105, the seventh electric three-way regulating valve 106, and the eighth electric three-way regulating valve 107 of the lower stacked unit CDU2, all have their E, F, and G connected. The ninth electric three-way regulating valve 108, the tenth electric three-way regulating valve 109, the eleventh electric three-way regulating valve 1010, and the twelfth electric three-way regulating valve 1011 of the upper stacked unit CDU2 only have their F and G connected. At this point, the working fluid in the secondary flow path is pumped to the server cold plate by the mechanical pumps 6 of the base CDU1 and the two stacked units CDU2 to absorb heat. Then, the working fluid flows back to the first plate heat exchanger 5 and the second plate heat exchanger 55 to exchange heat with the working fluid in the primary flow path 3. Subsequently, the working fluid in the primary flow path 3 flows into the external cold source for heat dissipation, while the working fluid in the secondary flow path 4 is pumped to the server cold plate again to absorb heat, forming a three-CDU closed-loop heat exchange system.

[0038] When further expansion of CDU power is required, additional stacking units CDU2 can be added to achieve modular power expansion through multiple stacked CDUs. In the multiple stacked CDUs, the control motherboard 81 is located inside the first storage area 71. The lines or Bluetooth signals of sensors, regulating valves, and switching power supplies 83 in the base CDU1 and multiple stacked units CDU2 are all connected to the control motherboard 81. The control motherboard 81 centrally collects and controls the signals of the stacked CDUs. The control board screen 82 is located outside the first storage area 71, allowing staff to easily view the real-time operating status of the stacked CDUs and operate them, controlling the operation of the mechanical pump 6, multiple sensors, and regulating valves.

[0039] In summary, the embodiments of the present invention have the following advantages compared with the prior art: 1) In this embodiment, the number of stacked CDUs can be selected according to power requirements, which can solve the problems of insufficient power of rack-mounted CDUs and excessive size of cabinet-mounted CDUs.

[0040] 2) The stacked CDU in this embodiment can stack different power stacking units as needed. When the required power increases or decreases, there is no need to develop a new model of CDU. Power matching can be completed simply by adding or removing existing stacking unit CDUs, saving development cycle and cost.

[0041] 3) In this embodiment, the number of stacked CDUs in operation can be controlled according to real-time power demand, so as to meet the power demand while reducing energy consumption.

[0042] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A stacked CDU device, characterized in that, It includes a base CDU, several stacked unit CDUs, and an electronic control module, wherein the electronic control module is disposed on the side wall of the base CDU, wherein: The base CDU includes a primary flow path, a secondary flow path, a first plate heat exchanger, a mechanical pump, and a first frame. The primary flow path, the secondary flow path, the first plate heat exchanger, and the mechanical pump are all located within the first frame. The aforementioned stacked units (CDUs) include single-unit stacked CDUs, two-unit stacked CDUs, or multiple-unit stacked CDUs. The electronic control module includes a control motherboard, a control board screen, and a switching power supply.

2. The stacked CDU device according to claim 1, characterized in that, The primary flow path specifically includes a primary side inlet, a first temperature sensor, a first electrically operated three-way regulating valve, a first plate heat exchanger inlet, a first plate heat exchanger outlet, a second electrically operated three-way regulating valve, a second temperature sensor, and a primary side outlet. The primary side inlet, the first temperature sensor, the first electrically operated three-way regulating valve, the first plate heat exchanger inlet, the first plate heat exchanger outlet, the second electrically operated three-way regulating valve, the second temperature sensor, and the primary side outlet are arranged sequentially along the working fluid flow direction, wherein: The first temperature sensor is used to monitor the working fluid temperature at the primary side inlet; The second temperature sensor is used to monitor the working fluid temperature at the primary side outlet.

3. The stacked CDU device according to claim 2, characterized in that, The secondary flow path specifically includes a secondary side inlet, an ultraviolet lamp, a third temperature sensor, a conductivity sensor, a first pressure sensor, a third electric three-way regulating valve, a second pressure sensor, a parallel branch, a second plate heat exchanger inlet, a second plate heat exchanger outlet, a fourth electric three-way regulating valve, a third pressure sensor, a fourth temperature sensor, an electromagnetic flowmeter, and a secondary side outlet. The secondary side inlet, ultraviolet lamp, third temperature sensor, conductivity sensor, first pressure sensor, third electric three-way regulating valve, second pressure sensor, parallel branch, second plate heat exchanger inlet, second plate heat exchanger outlet, fourth electric three-way regulating valve, third pressure sensor, fourth temperature sensor, electromagnetic flowmeter, and secondary side outlet are sequentially arranged along the working fluid flow direction, wherein: The ultraviolet lamp is used to disinfect the working fluid; The third temperature sensor is used to monitor the working fluid temperature at the secondary side inlet; The fourth temperature sensor is used to monitor the working fluid temperature at the secondary side outlet. The conductivity sensor is used to monitor the conductivity of the working fluid and determine whether the base CDU needs to be replaced. The second pressure sensor is used to monitor the internal pressure of the pipe between the secondary side inlet and the inlet of the second plate heat exchanger; The third pressure sensor is used to monitor the internal pressure of the pipe between the outlet of the second plate heat exchanger and the secondary side outlet. The first pressure sensor is used to monitor the internal pressure of the main pipeline after stacking; The electromagnetic flowmeter is used to monitor the flow rate inside the secondary flow path pipeline.

4. The stacked CDU device according to claim 3, characterized in that, The parallel branch specifically includes a first branch and a second branch. Both the first and second branch include a mechanical pump, a ball valve, a Y-type filter, and a check valve. The mechanical pump, the ball valve, the Y-type filter, and the check valve are arranged sequentially along the working fluid flow direction, wherein: The mechanical pump is used to facilitate the flow of the working fluid; The ball valve is used to cut off the flow of the working fluid; The Y-type filter is used to filter impurities in the working fluid; The one-way valve is used to control the unidirectional flow of the working fluid.

5. A stacked CDU device according to claim 4, characterized in that, The first frame is provided with a first storage area. The control motherboard is located inside the first storage area and is used for signal acquisition and status perception of the stacked CDU. The control board screen is located outside the first storage area and is used by the staff to view the real-time status of the stacked CDU and perform operation control. The switching power supply is located in the first storage area and is used to power the mechanical pump.

6. The stacked CDU device according to claim 5, characterized in that, When the stacking unit CDU is a two-unit stacked CDU, the frame size of the base CDU and the stacking unit CDU is the same. When stacked, the primary side inlet and primary side outlet of the upper stacking unit CDU coincide with the primary side branch inlet and primary side branch outlet of the lower base CDU. The secondary side inlet and secondary side outlet of the upper stacking unit CDU coincide with the secondary side branch inlet and secondary side branch outlet of the lower base CDU. The pipeline between the base CDU and the stacking unit CDU is connected by flanges.

7. A stacked CDU device according to claim 6, characterized in that, The operation modes of the two stacked CDUs include single-operation base CDU and simultaneous operation of base CDU and stacked unit CDU, wherein: For a single-operation base CDU, the first, second, third, and fourth electric three-way regulating valves of the base CDU are all only connected to the E and F ends. For simultaneous operation of the base CDU and the stacking unit CDU, the E, F and G terminals of the first, second, third and fourth electric three-way regulating valves of the base CDU are all connected, while the F and G terminals of the fifth, sixth, seventh and eighth electric three-way regulating valves of the stacking unit CDU are only connected.

8. A stacked CDU device according to claim 7, characterized in that, When the stacked unit CDU is a multi-unit stacked CDU, it is composed of a base CDU and multiple stacked unit CDUs stacked together. The multiple stacked unit CDUs are of the same size. When multiple stacked unit CDUs are stacked, the primary side inlet and primary side outlet of the upper stacked unit CDU coincide with the primary side branch inlet and primary side branch outlet of the lower stacked unit CDU. The secondary side inlet and secondary side outlet of the upper stacked unit CDU coincide with the secondary side branch inlet and secondary side branch outlet of the lower stacked unit CDU. The pipelines between the stacked unit CDUs are connected by flanges.

9. A stacked CDU device according to claim 8, characterized in that, The operation modes of the multi-unit stacked CDU include single-operation base CDU, simultaneous operation of base CDU and lower stacked units, and simultaneous operation of base CDU and multiple stacked units, wherein: For a single-operation base CDU, the first, second, third, and fourth electric three-way regulating valves of the base CDU are all only connected to the E and F ends. For simultaneous operation of the base CDU and the lower stacking unit, the E, F and G terminals of the first, second, third and fourth electric three-way regulating valves of the base CDU are all connected, while the fifth, sixth, seventh and eighth electric three-way regulating valves of the lower stacking unit CDU are only connected to the F and G terminals. For simultaneous operation of the base CDU and multiple stacked units, the E, F, and G terminals of the first, second, third, and fourth electric three-way regulating valves of the base CDU, as well as the fifth, sixth, seventh, and eighth electric three-way regulating valves of the lower stacked unit CDU, are all connected. The F and G terminals of the ninth, tenth, eleventh, and twelfth electric three-way regulating valves of the upper stacked unit CDU are only connected.

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