CDU double-pump hot standby system

Abstract

The utility model discloses a CDU double-pump hot standby system which comprises a heat exchange unit comprising a cold side and a hot side; the primary side pipeline comprises a first pipeline and a second pipeline; the secondary side pipeline comprises a third pipeline and a fourth pipeline; the power unit is arranged on the third pipeline, the power unit comprises two fifth pipelines which are connected in parallel, each fifth pipeline is provided with a circulating pump, the two circulating pumps operate at the same frequency, and when one circulating pump is subjected to frequency reduction or stops working, the other circulating pump can adaptively increase the frequency. The power unit is arranged on the secondary side pipeline, the at least two circulating pumps of the power unit can operate at the same frequency, when one circulating pump breaks down, the other circulating pumps can still keep the normal operation of the system, then the heat dissipation performance of the system is guaranteed, and the fault rate of the system is reduced.

Description

Technical Field

[0001] This utility model relates to the field of equipment cooling technology, and in particular to a CDU dual-pump thermal standby system. Background Technology

[0002] Existing liquid cooling distribution units used in data centers mostly employ single-pump operation or dual-pump cold standby operation. Single-pump operation has a relatively simple structure and control logic, but pump failure can lead to insufficient cooling for the server load. Dual-pump cold standby operation involves pumps rotating between each other; when one pump fails, the other starts. During the restart process, there is a delay in the software receiving and sending signals, and the inverter's time from stop to start is relatively long. This results in significant fluctuations in secondary flow rate and water supply temperature, causing the server to fail to cool properly. Utility Model Content

[0003] The purpose of this invention is to provide a CDU dual-pump thermal standby system to improve the system's heat dissipation performance and reduce the system's failure rate.

[0004] This utility model provides a CDU dual-pump hot standby system, including:

[0005] A heat exchange unit, the heat exchange unit comprising a cold side and a hot side;

[0006] The primary side piping includes a first piping and a second piping. The first piping is connected to the inlet end of the cold side of the heat exchange unit, and the outlet end of the cold side of the heat exchange unit is connected to the second piping.

[0007] The secondary side piping includes a third piping and a fourth piping. The third piping is connected to the inlet end of the heat exchange unit on the hot side, and the outlet end of the heat exchange unit on the hot side is connected to the fourth piping.

[0008] A power unit is located on the third pipeline. The power unit includes two fifth pipelines connected in parallel. Each fifth pipeline is equipped with a circulation pump. The two circulation pumps can operate at the same frequency. When one of the circulation pumps reduces its frequency or stops operating, the other circulation pump can adaptively increase its frequency.

[0009] In the CDU dual-pump hot standby system described above, preferably, each of the fifth pipelines is provided with a one-way valve, which is located at the outlet end of the circulating pump and is used to control the flow of fluid from the circulating pump to the inlet end of the heat exchange unit on the hot side.

[0010] In the CDU dual-pump hot standby system described above, preferably, an exhaust unit is provided on the third pipeline, and the outlet end of the exhaust unit is connected to the power unit.

[0011] In the CDU dual-pump hot standby system described above, preferably, the CDU dual-pump hot standby system further includes a liquid replenishment unit, which includes a liquid replenishment tank and a sixth pipeline. One end of the sixth pipeline is connected to the exhaust unit, and the other end of the sixth pipeline is connected to the liquid replenishment tank.

[0012] In the CDU dual-pump hot standby system described above, preferably, the CDU dual-pump hot standby system further includes a seventh pipeline, one end of which is connected to the exhaust unit, and the other end of which is connected to the fourth pipeline. An electric two-way valve is provided on the seventh pipeline.

[0013] In the CDU dual-pump hot standby system described above, preferably, the connection between the seventh pipeline and the fourth pipeline forms a first connection point, and the fourth pipeline is provided with a first filter, which is located between the first connection point and the outlet end of the fourth pipeline.

[0014] In the CDU dual-pump hot standby system described above, preferably, a second filter is provided on the first pipeline.

[0015] In the CDU dual-pump hot standby system described above, preferably, an expansion tank is provided on the third pipeline between the exhaust unit and the power unit.

[0016] In the CDU dual-pump hot standby system described above, preferably, a safety valve is provided on the third pipeline between the inlet end of the power unit and the inlet end of the heat exchange unit on the hot side.

[0017] In the CDU dual-pump hot standby system described above, preferably, temperature sensors and pressure sensors are provided at the inlet end of the first pipeline, the outlet end of the second pipeline, the inlet end of the third pipeline, and the outlet end of the fourth pipeline.

[0018] Compared with the prior art, this utility model sets up a power unit on the secondary side pipeline. At least two circulation pumps of the power unit can operate at the same frequency. When one circulation pump fails, the other circulation pumps can still keep the system running normally, thereby ensuring the heat dissipation performance of the system and reducing the system failure rate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the CDU dual-pump hot standby system provided in an embodiment of this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 10 - Heat exchange unit, 11 - Cold side, 12 - Hot side;

[0022] 20 - Primary side piping; 21 - Secondary filter;

[0023] 30 - Secondary side pipeline, 31 - First filter, 32 - Expansion tank, 33 - Safety valve;

[0024] 40 - Power unit; 41 - Circulation pump; 42 - Check valve;

[0025] 50 - Exhaust unit;

[0026] 60 - Replenishment unit, 61 - Replenishment tank;

[0027] 70-Electric two-way valve;

[0028] 80-Butterfly Valve;

[0029] 90 - Temperature sensor;

[0030] 100 - Pressure sensor;

[0031] L1 - First connection point;

[0032] G1 - First pipeline, G2 - Second pipeline, G3 - Third pipeline, G4 - Fourth pipeline, G5 - Fifth pipeline, G6 - Sixth pipeline, G7 - Seventh pipeline. Detailed Implementation

[0033] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Reference Figure 1 As shown, this utility model provides a CDU dual-pump thermal standby system, including a heat exchange unit 10, a primary side pipeline 20, a secondary side pipeline 30, and a power unit 40, wherein:

[0035] The heat exchange unit 10 includes a cold side 11 and a hot side 12. The working fluid of the primary side pipe 20 and the working fluid of the secondary side pipe 30 flow through the cold side 11 and hot side 12 of the heat exchange unit 10, respectively, to exchange heat. The heat exchange unit 10 of this application can be a plate heat exchanger. A plate heat exchanger is a type of indirect heat exchanger, a high-efficiency heat exchange device with high heat conduction and heat transfer efficiency. It facilitates good heat exchange between the working fluid of the primary side pipe 20 and the working fluid of the secondary side pipe 30, thereby improving the system's heat dissipation efficiency for the secondary side load equipment. Other high-efficiency heat exchange devices can also be used for the heat exchange unit 10, and this is not limited here.

[0036] The primary side pipeline 20 is a cold source side pipeline connected to the cooling tower. The primary side pipeline 20 is a flow pipeline for the low-temperature working fluid. The primary side pipeline 20 includes a first pipeline G1 and a second pipeline G2. The first pipeline G1 is connected to the inlet end of the cold side 11 of the heat exchange unit 10, and the outlet end of the cold side 11 of the heat exchange unit 10 is connected to the second pipeline G2. The low-temperature working fluid enters the cold side 11 of the heat exchange unit 10 through the first pipeline G1, and rises in temperature after exchanging heat with the hot side 12 of the heat exchange unit 10. After the working fluid is heated, it flows out through the second pipeline G2 and is sent to a cooling device (such as a dry cooler, cooling tower, etc.) for cooling and cooling. Then it is circulated back to the first pipeline G1, thereby realizing the circulating cooling process of the working fluid.

[0037] The secondary side pipeline 30 is the load side pipeline, which is the flow pipeline for the high-temperature working fluid. The secondary side pipeline 30 includes a third pipeline G3 and a fourth pipeline G4. The outlet end of the third pipeline G3 is connected to the inlet end of the hot side 12 of the heat exchange unit 10, and the outlet end of the hot side 12 of the heat exchange unit 10 is connected to the inlet end of the fourth pipeline G4. The high-temperature working fluid enters the hot side 12 of the heat exchange unit 10 through the third pipeline G3, exchanges heat with the cold side 11 of the heat exchange unit 10 and is cooled down. The cooled working fluid flows to the load through the fourth pipeline G4 to cool the load equipment.

[0038] The power unit 40 is located on the third pipeline G3. The power unit 40 includes two fifth pipelines G5 connected in parallel. Each fifth pipeline G5 is equipped with a circulation pump 41. Both circulation pumps 41 are used to provide flow power for the high-temperature working fluid flowing to the heat exchange unit 10. Under normal operating conditions, the two circulation pumps 41 can operate at the same frequency. When one circulation pump 41 reduces its frequency or stops operating, the other circulation pump 41 can adaptively increase its frequency so that the system can operate normally.

[0039] Reference Figure 1 As shown in the diagram, the arrows indicate the direction of the working fluid flow. When the working fluid in the primary side pipe 20 and the secondary side pipe 30 exchange heat, the low-temperature working fluid flows from the first pipe G1 to the inlet of the cold side 11 of the heat exchange unit 10 and enters the heat exchange unit 10. At the same time, the two circulation pumps 41 of the power unit 40 operate at the same frequency. The high-temperature working fluid flowing in from the third pipe G3, after passing through the power unit 40, splits into two paths, flows through the two circulation pumps 41 respectively, and then converges into the third pipe G3 before flowing into the hot side 12 of the heat exchange unit 10. After exchanging heat with the low-temperature working fluid on the cold side 11 of the heat exchange unit 10, it cools down and then flows to the load equipment through the fourth pipe G4 to cool and dissipate heat from the load equipment. The working fluid on the cold side 11 of the heat exchange unit 10 heats up after exchanging heat with the high-temperature working fluid in the secondary side pipe 30 and flows to the cooling equipment through the second pipe G2.

[0040] When one of the two circulating pumps 41 fails (resulting in frequency reduction or shutdown) and cannot provide sufficient power to the working fluid flowing into the corresponding pipeline, the other circulating pump 41 can quickly and adaptively increase its frequency to meet the current system requirements. At this time, the working fluid flowing in from the third pipeline G3 flows through the pipeline where the normally operating circulating pump 41 is located, and then flows into the hot side 12 of the heat exchange unit 10 to exchange heat with the working fluid on the cold side 11 of the heat exchange unit 10. This still allows for heat dissipation and cooling of the load equipment, reducing the system failure rate.

[0041] In the embodiments provided in this application, each fifth pipeline G5 is equipped with a one-way valve 42. The one-way valve 42 is located at the outlet end of the circulating pump 41. The one-way valve 42 is used to control the flow of fluid from the circulating pump 41 to the inlet end of the hot side 12 of the heat exchange unit 10, so that the working fluid flowing through the fifth pipeline G5 flows in one direction. The two one-way valves 42 are provided to ensure that the high-temperature working fluid on the secondary side can enter the hot side 12 of the heat exchange unit 10 for heat exchange, and to prevent the cooling working fluid from flowing back and affecting the heat dissipation effect.

[0042] In existing technologies, single-pump operation or dual-pump cold standby operation methods, for single-pump operation, use check valves at the outlets of two circulating pumps. To prevent cross-flow during single-pump operation due to the failure of one circulating pump, the check valve is placed at the outlet of the circulating pump. However, during liquid injection, the check valve cannot be opened, causing gas to accumulate in the pump body and become trapped, resulting in airlock after pump startup. Therefore, a bypass capillary tube needs to be added at the inlet and outlet of the check valve to allow some gas to be discharged in advance during liquid injection, avoiding damage to the pump. If the unit is in cold standby operation, and the pressure generated by the working fluid driven by one circulating pump reaches the back pressure of the working fluid at the outlet of the other circulating pump, if the first circulating pump fails, the back pressure of the check valve will be relatively large, resulting in relatively greater resistance during the restart of the other circulating pump.

[0043] This application adopts a dual-pump hot standby operation mode, with two one-way valves 42 respectively set at the outlet end of the two circulating pumps 41. The two circulating pumps 41 operate at the same frequency. At this time, the back pressure of the working fluid at the outlet of one circulating pump 41 on the one-way valve 42 at the outlet of the other circulating pump 41 is small. Assuming that one of the circulating pumps 41 fails at this time, the other circulating pump 41 has less resistance to overcome during the speed increase process and can quickly run to the steady-state speed of dual-pump operation. At this time, the system can maintain the stability of the flow rate and meet the continuous and uninterrupted characteristics.

[0044] In the embodiments provided in this application, an exhaust unit 50 is provided on the third pipeline G3. The outlet end of the exhaust unit 50 is connected to the power unit 40. The exhaust unit 50 is used to maintain a constant system pressure, thereby enabling the system to operate stably. The high-temperature working fluid input from the third pipeline G3 is regulated by the exhaust unit 50 to maintain a stable pressure before entering the power unit 40. Under the action of the circulating pump 41, it enters the heat exchange unit 10. Because the working fluid pressure is stable, the circulating pump 41 can maintain normal operation, thereby effectively preventing malfunctions. Specifically, the exhaust unit 50 includes a static pressure exhaust tank, which is a pressure vessel used to store compressed gas. It can balance the gas pressure in the system and ensure stable system operation. In other embodiments, the exhaust unit 50 may adopt other structures or devices that can maintain stable system pressure, which are not limited here.

[0045] During normal maintenance and operation of the CDU system, it is necessary to replenish the system with liquid (such as water or coolant) to meet the system's operational requirements. Therefore, the CDU dual-pump hot standby system of this application also includes a liquid replenishment unit 60. The liquid replenishment unit 60 includes a liquid replenishment tank 61 and a sixth pipeline G6. One end of the sixth pipeline G6 is connected to the exhaust unit 50, and the other end of the sixth pipeline G6 is connected to the liquid replenishment tank 61. When the working fluid in the system is insufficient and needs to be replenished, the liquid replenishment tank 61 is opened to replenish the third pipeline G3. The working fluid in the liquid replenishment tank 61 flows to the exhaust unit 50 through the sixth pipeline G6. Under the action of the exhaust unit 50, the replenished liquid reaches the pressure required by the system and then enters the third pipeline G3 and flows to the power unit 40.

[0046] Since the function of the circulating pump 41 in the power unit 40 is to provide flow power for the working fluid on the load side, if the pressure difference is still greater than the set value even when the speed of the circulating pump 41 is adjusted to the minimum, it is necessary to adjust the pressure difference to the set value so that the system can operate normally. To solve this problem, in the embodiment provided in this application, the CDU hot standby system also includes a seventh pipeline G7. One end of the seventh pipeline G7 is connected to the exhaust unit 50, and the other end of the seventh pipeline G7 is connected to the fourth pipeline G4. An electric two-way valve 70 is provided on the seventh pipeline G7. The electric two-way valve 70 of this application is a pressure differential regulating electric two-way valve, which regulates the system pressure by controlling the opening and closing of the valve port. When the pressure in the system is higher than the set value, the valve port of the pressure differential regulating electric two-way valve opens, thereby reducing the pressure in the system. Conversely, when the pressure in the system is lower than the set value, the valve port of the pressure differential regulating electric two-way valve closes, thereby increasing the system pressure difference. Therefore, when the speed of the circulating pump 41 has been adjusted to the minimum, but the system differential pressure is still greater than the set value, the differential pressure regulating electric two-way valve is used to adjust the system differential pressure to the set value, enabling the system to operate normally. Through the coordinated work of the circulating pump 41 and the differential pressure regulating electric two-way valve, the system can be ensured to operate efficiently and stably under various operating conditions.

[0047] The cleanliness of the working fluid has a certain impact on the cooling effect. To ensure a stable cooling effect in the liquid cooling system, the working fluid in the pipeline needs to be filtered to remove impurities. In the embodiment provided in this application, the connection point L1 is formed at the junction of the seventh pipeline G7 and the fourth pipeline G4. A first filter 31 is provided on the fourth pipeline G4, located between the first connection point L1 and the outlet end of the fourth pipeline G4. Whether the working fluid flows out from the hot side 12 of the heat exchange unit 10 or flows directly from the seventh pipeline G7 into the fourth pipeline G4, it must be filtered by the first filter 31 before flowing to the load device to remove impurities from the working fluid, thereby enabling the working fluid used for heat dissipation and cooling to have a better cooling effect.

[0048] Furthermore, a second filter 21 is provided on the first pipeline G1. The working fluid flowing through the first pipeline G1 is filtered by the second filter 21 before flowing to the cold side 11 of the heat exchange unit 10, which improves the cleanliness of the low-temperature working fluid entering the heat exchange unit 10 and is conducive to improving the heat exchange efficiency between the low-temperature working fluid and the high-temperature working fluid.

[0049] When the system malfunctions and requires maintenance, the flow of the working fluid needs to be cut off. In the embodiments provided in this application, butterfly valves 80 are provided at the inlet and outlet ends of the first filter 31 and the inlet and outlet ends of the second filter 21. Since the butterfly valves 80 have the characteristic of fast opening and closing speed, when the primary side pipeline 20 or the secondary side pipeline 30 malfunctions, opening the butterfly valves 80 on the corresponding pipelines can quickly cut off the flow channel of the working fluid on the corresponding side. For the secondary side pipeline 30, butterfly valves 80 are provided at the inlet and outlet ends of the first filter 31. When the butterfly valves 80 on both sides are opened, the working fluid that has not flowed into the first filter 31 cannot continue to flow into the first filter 31, and the working fluid filtered by the first filter 31 cannot continue to flow to the load equipment. Similarly, for the primary side pipeline 20, the working fluid that has not flowed into the second filter 21 cannot continue to flow to the second filter 21, and the working fluid filtered by the second filter 21 cannot continue to flow to the heat exchange unit 10. The operator can inspect and maintain each pipeline section cut off by the butterfly valves 80.

[0050] In the embodiments provided in this application, an expansion tank 32 is provided on the third pipeline G3 between the exhaust unit 50 and the power unit 40. After the working fluid flows out through the exhaust unit 50, the expansion tank 32 can absorb the pressure fluctuations in the system caused by temperature changes or other reasons, and maintain the stability of the system pressure, thereby avoiding system damage caused by excessively high or low pressure.

[0051] To further ensure the stability of the system pressure, a safety valve 33 is installed on the third pipeline G3 between the inlet end of the hot side 12 of the power unit 40 and the heat exchange unit 10. When the system pressure is too high during the process of the working fluid flowing from the power unit 40 to the heat exchange unit 10, the safety valve 33 can automatically release pressure so that the system pressure can be restored to the normal pressure value, thereby improving the safety of the system.

[0052] To monitor the temperature and pressure of the primary side pipeline 20 and the secondary side pipeline 30, and to understand the system's operating efficiency and maintain its stability and safety, temperature sensors 90 and pressure sensors 100 are installed at the inlet of the first pipeline G1, the outlet of the second pipeline G2, the inlet of the third pipeline G3, and the outlet of the fourth pipeline G4. In the embodiment provided in this application, the inlet water temperature of the first pipeline G1 is 35°C, the outlet water temperature of the second pipeline G2 is 45°C, the inlet water temperature of the third pipeline G3 is 50°C, and the outlet water temperature of the fourth pipeline G4 is 40°C. Through real-time monitoring by the four temperature sensors 90, it can be known that the working fluid temperature on the load side drops from 50°C to 40°C, thereby allowing real-time monitoring of the heat dissipation effect on the load equipment.

[0053] By setting temperature sensors 90 and pressure sensors 100 at four locations, the temperature and pressure of the low-temperature working fluid on the primary side, the high-temperature working fluid after heat exchange, and the high-temperature working fluid and the low-temperature working fluid after heat exchange on the secondary side can be monitored in real time. By detecting these data, it can be understood in real time whether the cooling working fluid of the system meets the required cooling requirements and whether the load equipment can be effectively dissipated. When the detected data does not meet the requirements, the system can be adjusted to achieve a good heat dissipation effect.

[0054] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A CDU dual-pump hot standby system, characterized in that, include: A heat exchange unit, the heat exchange unit comprising a cold side and a hot side; The primary side piping includes a first piping and a second piping. The first piping is connected to the inlet end of the cold side of the heat exchange unit, and the outlet end of the cold side of the heat exchange unit is connected to the second piping. The secondary side piping includes a third piping and a fourth piping. The third piping is connected to the inlet end of the heat exchange unit on the hot side, and the outlet end of the heat exchange unit on the hot side is connected to the fourth piping. A power unit is located on the third pipeline. The power unit includes two fifth pipelines connected in parallel. Each fifth pipeline is equipped with a circulation pump. The two circulation pumps can operate at the same frequency. When one of the circulation pumps reduces its frequency or stops operating, the other circulation pump can adaptively increase its frequency.

2. The CDU dual-pump hot standby system according to claim 1, characterized in that, Each of the fifth pipelines is equipped with a one-way valve, which is located at the outlet end of the circulating pump. The one-way valve is used to control the flow of fluid from the circulating pump to the inlet end of the heat exchange unit on the hot side.

3. The CDU dual-pump hot standby system according to claim 1, characterized in that, An exhaust unit is provided on the third pipeline, and the outlet end of the exhaust unit is connected to the power unit.

4. The CDU dual-pump hot standby system according to claim 3, characterized in that, The CDU dual-pump hot standby system also includes a liquid replenishment unit, which includes a liquid replenishment tank and a sixth pipeline. One end of the sixth pipeline is connected to the exhaust unit, and the other end of the sixth pipeline is connected to the liquid replenishment tank.

5. The CDU dual-pump hot standby system according to claim 3, characterized in that, The CDU dual-pump hot standby system also includes a seventh pipeline, one end of which is connected to the exhaust unit, and the other end of which is connected to the fourth pipeline. An electric two-way valve is provided on the seventh pipeline.

6. The CDU dual-pump hot standby system according to claim 5, characterized in that, The connection between the seventh pipeline and the fourth pipeline forms a first connection point. The fourth pipeline is equipped with a first filter, which is located between the first connection point and the outlet end of the fourth pipeline.

7. The CDU dual-pump hot standby system according to claim 6, characterized in that, A second filter is installed on the first pipeline.

8. The CDU dual-pump hot standby system according to claim 3, characterized in that, An expansion tank is provided on the third pipeline between the exhaust unit and the power unit.

9. The CDU dual-pump hot standby system according to claim 1, characterized in that, A safety valve is provided on the third pipeline between the inlet end of the heat side of the power unit and the heat exchange unit.

10. The CDU dual-pump hot standby system according to claim 1, characterized in that, Temperature sensors and pressure sensors are provided at the inlet end of the first pipeline, the outlet end of the second pipeline, the inlet end of the third pipeline, and the outlet end of the fourth pipeline.

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