An energy storage liquid cooling system and its control method for preventing liquid slugging.

Abstract

This invention relates to the field of energy storage liquid-cooled air conditioning technology, and discloses an energy storage liquid-cooled system and its anti-liquid slugging control method. The system includes: a control module, a water circuit subsystem, a refrigerant circuit subsystem, a first heat exchange component, and a second heat exchange component. The water circuit subsystem is coupled to the refrigerant circuit subsystem via the first heat exchange component for primary heat exchange; the water circuit subsystem is coupled to the refrigerant circuit subsystem via the second heat exchange component for auxiliary heat exchange; the control module is electrically connected to both the water circuit and refrigerant circuit subsystems. The control module adjusts the operating parameters of the water circuit and refrigerant circuit subsystems, and then adjusts the refrigerant flow rate of the second heat exchange component to stabilize the suction temperature of the compressor in the refrigerant circuit subsystem within a preset temperature range. This invention combines the water circuit system and the refrigerant circuit system, prevents compressor liquid slugging by controlling the suction temperature, reduces system complexity, and improves the system's cooling capacity and safety reliability.

Description

Technical Field

[0001] This invention relates to the field of energy storage liquid cooling air conditioning technology, specifically to an energy storage liquid cooling system and its control method for preventing liquid slugging. Background Technology

[0002] With the increasing popularity of energy storage air conditioners and the rise of energy storage devices, more and more companies have realized the necessity of energy storage devices. In a rapidly developing era, people's electricity demand is increasing daily, and how to maintain a stable power supply and low-cost electricity consumption has become a key issue for major enterprises and operators. Therefore, energy storage equipment, energy storage battery containers, and energy storage cabinets have emerged; energy storage air conditioners are providing high-quality cooling services for energy storage devices. As the demand for energy storage devices increases, the demand for energy storage air conditioners is also increasing. Current liquid cooling systems for energy storage air conditioners include the following:

[0003] (1) Ordinary energy storage liquid cooling system: The fluorine route consists of a compressor, condenser, throttling device and evaporator; the water route consists of a circulating pump, electric heating module, plate heat exchanger and expansion tank. It is simple in form, relatively simple in structure, low in reliability, and limited to small systems.

[0004] (2) Automatic liquid cooling system for energy storage: The refrigerant route consists of a compressor, condenser, throttling device and evaporator; the water route consists of a circulating pump, electric heating module and plate heat exchanger. The liquid replenishment pump, liquid replenishment tank and expansion tank have added liquid replenishment function. Overall, it is relatively general and can basically meet the needs of use. It can be used in medium and large systems, but it has not achieved maximum energy saving and high efficiency and lacks technological innovation.

[0005] Existing conventional energy storage liquid cooling systems are simple in form and limited to small systems. When the ambient temperature changes significantly, the system pressure is easily affected. They lack liquid replenishment function and have low reliability. In contrast, automatic liquid replenishment liquid cooling systems can achieve automatic liquid replenishment, but they fail to achieve maximum energy efficiency and lack technological innovation. The overall power consumption of the unit is moderate. Summary of the Invention

[0006] This invention provides an energy storage liquid cooling system and a control method for preventing liquid slugging, in order to solve the problem of low reliability of traditional energy storage liquid cooling systems.

[0007] In a first aspect, the present invention provides an energy storage liquid cooling system, comprising: a control module, a water circuit subsystem, a refrigerant circuit subsystem, a first heat exchange component, and a second heat exchange component, wherein a refrigerant flows within the water circuit subsystem, and a refrigerant flows within the refrigerant circuit subsystem; the water circuit subsystem is coupled to the refrigerant circuit subsystem via the first heat exchange component for primary heat exchange; the water circuit subsystem is coupled to the refrigerant circuit subsystem via the second heat exchange component for auxiliary heat exchange; the control module is electrically connected to the water circuit subsystem and the refrigerant circuit subsystem, and the control module is used to adjust the operating parameters of the water circuit subsystem and the refrigerant circuit subsystem, and then adjust the refrigerant flow rate of the second heat exchange component, so that the suction temperature of the compressor in the refrigerant circuit subsystem is stabilized within a preset temperature range.

[0008] The energy storage liquid cooling system provided by this invention meets the basic cooling or heating requirements of the system through a main heat exchange loop consisting of a water circuit subsystem, a first heat exchange component, and a refrigerant circuit subsystem. Simultaneously, an auxiliary heat exchange loop consisting of a second heat exchange component is added, and the flow rate of the refrigerant flowing through this loop is intelligently adjusted by the control module. This allows for precise secondary heat management of the refrigerant at the compressor suction port, effectively increasing the compressor suction superheat and ensuring complete refrigerant vaporization. This fundamentally prevents liquid slugging caused by liquid refrigerant being drawn into the compressor, greatly improving the cooling capacity and safety reliability of the refrigerant system. Furthermore, this integrated design is the first in the energy storage field to provide a method for controlling suction temperature by combining a water circuit system and a refrigerant system, avoiding the need for additional complex electric heating or mechanical protection devices, simplifying the system structure, reducing energy consumption and cost, and achieving the dual goals of high efficiency, energy saving, and stable reliability.

[0009] In one optional embodiment, the water circuit subsystem includes: a replenishment tank, a circulating water pump, and a liquid heater, wherein the circulating water pump and the liquid heater are both electrically connected to the control module; the outlet of the replenishment tank is connected to the inlet of the circulating water pump; the outlet of the circulating water pump is connected to the inlet of the liquid heater; the outlet of the liquid heater is connected to the inlet of the refrigerant channel of the first heat exchange component; and the outlet of the refrigerant channel of the first heat exchange component is connected to the inlet of the replenishment tank.

[0010] In one optional embodiment, the water circuit subsystem further includes: an electric valve, wherein the electric valve is electrically connected to the control module; the inlet of the electric valve is connected to the outlet of the liquid heater, and the inlet of the electric valve is connected to the inlet of the refrigerant channel of the second heat exchange component; the electric valve is used to adjust the opening degree based on the control signal of the control module to adjust the refrigerant flow rate of the second heat exchange component; the outlet of the refrigerant channel of the second heat exchange component is connected to the inlet of the circulating water pump.

[0011] In one optional embodiment, the water circuit subsystem further includes: a compressor liquid-cooled drive plate and an expansion tank, wherein the inlet of the compressor liquid-cooled drive plate is connected to the outlet of the liquid heater, the outlet of the compressor liquid-cooled drive plate is connected to the inlet of the circulating water pump, and the expansion tank is connected to the inlet of the circulating water pump.

[0012] In one optional embodiment, the fluorine circuit subsystem includes: a compressor and a condenser, wherein the compressor is electrically connected to a control module; the inlet of the compressor is connected to the outlet of the refrigerant passage of the second heat exchange component, and the outlet of the compressor is connected to the inlet of the condenser; the outlet of the condenser is connected to the inlet of the refrigerant passage of the first heat exchange component; and the outlet of the refrigerant passage of the first heat exchange component is connected to the inlet of the refrigerant passage of the second heat exchange component.

[0013] In one alternative embodiment, the fluorine circuit subsystem further includes a temperature sensor, wherein the temperature sensor is electrically connected to the control module, the temperature sensor is disposed on the fluorine line at the compressor inlet, and the temperature sensor is used to collect the compressor suction temperature.

[0014] In one alternative embodiment, the fluorine circuit subsystem further includes: a filter and an electronic expansion valve, wherein the electronic expansion valve is electrically connected to the control module; the filter and the electronic expansion valve are sequentially arranged on the fluorine pipeline between the condenser and the first heat exchange component.

[0015] In one optional embodiment, the first heat exchange component is a plate heat exchanger, and heat is transferred between the refrigerant channel and the refrigerant channel in the first heat exchange component through a metal plate.

[0016] Secondly, the present invention provides a control method for preventing liquid slugging in an energy storage liquid cooling system, applied to a control module in an energy storage liquid cooling system according to the first aspect above or any corresponding embodiment. The method includes: acquiring the current operating mode of the energy storage liquid cooling system; when it is determined that the current operating mode is a mode requiring liquid slugging control, acquiring the real-time suction temperature of the compressor in the refrigerant circuit subsystem; comparing the real-time suction temperature with a preset temperature range; adjusting the opening of the electric valve in the water circuit subsystem based on the comparison result to adjust the refrigerant flow rate of the second heat exchange component, and then controlling the real-time suction temperature within the preset temperature range through auxiliary heat exchange.

[0017] The liquid slugging prevention control method for energy storage liquid cooling systems provided by this invention automatically enters the liquid slugging prevention protection process when the system's operating mode requires liquid slugging prevention control by real-time judgment of the system's operating mode. Based on the comparison between the real-time compressor suction temperature and the preset temperature range, the flow rate of the refrigerant flowing through the second heat exchange component in the water circuit subsystem is dynamically adjusted. This achieves precise control of the compressor suction temperature through auxiliary heat exchange between the refrigerant and the refrigerant in the second heat exchange component. This method effectively increases the compressor suction superheat, ensuring that the refrigerant is completely vaporized before entering the compressor. It fundamentally solves the compressor liquid slugging problem from a control logic perspective, significantly improving the safety and reliability of system operation.

[0018] In one optional implementation, the operating modes include: cooling mode, water system heating mode, and refrigerant system heating mode; the modes requiring anti-liquid slugging control are cooling mode and refrigerant system heating mode. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a composition diagram of an energy storage liquid cooling system according to an embodiment of the present invention;

[0021] Figure 2 This is a detailed structural diagram of an energy storage liquid cooling system according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic flowchart illustrating the control method for preventing liquid slugging in an energy storage liquid cooling system according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] During the operation of an energy storage air conditioner, the liquid refrigerant located in the gas-liquid separator of the air conditioner is prone to liquid slugging due to improper design of the internal oil return hole and pressure equalization hole, causing incompletely evaporated liquid refrigerant to flow back into the compressor. For example:

[0028] (1) In the cooling operation mode, when the outdoor environment and indoor temperature are low, the heat dissipation of the condenser drops sharply, the liquid refrigerant inside the condensing temperature increases and the subcooling increases, the temperature of the liquid refrigerant entering the evaporator is low, and the refrigerant entering the evaporator generally changes from the original two phases to a supersaturated liquid. At this time, due to the low indoor temperature, the liquid refrigerant in the evaporator does not evaporate completely, causing most of the liquid refrigerant to return to the gas-liquid separator and fill up, and be sucked into the compressor, causing liquid slugging.

[0029] (2) In the refrigeration operation mode, when the system load demand is large, the expansion valve needs to be opened to meet the load demand. In order to meet the output of refrigeration capacity, when the superheat gradually decreases and approaches 0℃, it is very easy to cause the evaporator to evaporate incompletely, and too much liquid refrigerant will flow back to the suction end and be sucked into the compressor, causing the compressor to liquid slug.

[0030] To address the aforementioned problems, this embodiment provides an energy storage liquid cooling system, such as... Figure 1 As shown, it includes: a water circuit subsystem 1, a fluorine circuit subsystem 2, a first heat exchange component 3, a second heat exchange component 4, and a control module 5.

[0031] Figure 1 In the system, the water circuit subsystem 1 carries the refrigerant, and the fluorine circuit subsystem 2 carries the refrigerant. The water circuit subsystem 1 is coupled to the fluorine circuit subsystem 2 through the first heat exchange component 3 for primary heat exchange. The water circuit subsystem 1 is coupled to the fluorine circuit subsystem 2 through the second heat exchange component 4 for auxiliary heat exchange.

[0032] Specifically, Figure 1In this system, the energy storage liquid cooling system operates collaboratively based on a dual heat exchange structure integrating a water subsystem 1 and a refrigerant subsystem 2. The water subsystem 1 serves as the circulation path for the refrigerant, while the refrigerant subsystem 2 serves as the circulation path for the refrigerant itself. The primary heat exchange is achieved through the first heat exchange component 3, completing the system's basic temperature control function. Building upon this, an auxiliary heat exchange channel is constructed using a second heat exchange component 4, enabling the refrigerant in the water subsystem 1 to perform precise secondary thermal management of the refrigerant flowing to the compressor in the refrigerant subsystem 2.

[0033] Optionally, the first heat exchange component can be a plate heat exchanger, a shell-and-tube heat exchanger, or a coaxial heat exchanger, and the second heat exchange component can be a high-efficiency compact plate heat exchanger, a plate-fin heat exchanger, or a microchannel heat exchanger. Heat transfer between the refrigerant channel and the coolant channel in both the first and second heat exchange components is achieved through metal plates.

[0034] Figure 1 In the middle, the control module 5 is electrically connected to the water circuit subsystem 1 and the refrigerant circuit subsystem 2. The control module 5 is used to adjust the operating parameters of the water circuit subsystem 1 and the refrigerant circuit subsystem 2, and then adjust the refrigerant flow rate of the second heat exchange component 4 so that the suction temperature of the compressor in the refrigerant circuit subsystem 2 is stabilized within the preset temperature range.

[0035] Specifically, Figure 1 In this system, control module 5 monitors and adjusts the refrigerant circulation parameters in the water circuit subsystem 1 and the refrigerant circulation parameters in the refrigerant circuit subsystem 2 in real time. Based on this, control module 5 precisely controls the auxiliary heat exchange process by accurately adjusting the refrigerant flow rate through the second heat exchange component 4. By adjusting the refrigerant flow rate through the second heat exchange component 4, the superheat of the refrigerant can be actively controlled, effectively preventing liquid refrigerant from entering the compressor in the refrigerant circuit subsystem 2 during system operation, thus achieving the goal of preventing liquid slugging. This two-stage heat exchange architecture and hierarchical control strategy ultimately ensures that the suction temperature of the compressor in the refrigerant circuit subsystem 2 can be stably maintained within the preset temperature range, guaranteeing the system's basic heat exchange requirements while enhancing the system's safety and control accuracy through the auxiliary heat exchange path, thereby ensuring that the system always operates under optimal conditions.

[0036] The energy storage liquid cooling system provided in this embodiment meets the basic cooling or heating requirements of the system through a main heat exchange loop consisting of a water circuit subsystem, a first heat exchange component, and a refrigerant circuit subsystem. Simultaneously, an auxiliary heat exchange loop consisting of a second heat exchange component is added, and the flow rate of the refrigerant flowing through this loop is intelligently adjusted by the control module. This allows for precise secondary heat management of the refrigerant at the compressor suction port, effectively increasing the compressor's suction superheat and ensuring complete refrigerant vaporization. This fundamentally prevents liquid slugging caused by liquid refrigerant being drawn into the compressor, greatly improving the cooling capacity and safety reliability of the refrigerant system. Furthermore, this integrated design is the first in the energy storage field to provide a method for controlling suction temperature by combining a water circuit system and a refrigerant system. This avoids the need for additional complex electric heating or mechanical protection devices, simplifies the system structure, reduces energy consumption and cost, and achieves the dual goals of high efficiency, energy saving, and stable reliability.

[0037] In some alternative implementations, such as Figure 2 As shown, the water circuit subsystem includes: a replenishment tank C1, a circulating water pump P1, and a liquid heater EE. Both the circulating water pump P1 and the liquid heater EE are electrically connected to the control module. The electrical paths between these components and the control module are not shown in this embodiment. The outlet of the replenishment tank C1 is connected to the inlet of the circulating water pump P1. The outlet of the circulating water pump P1 is connected to the inlet of the liquid heater EE. The outlet of the liquid heater EE is connected to the inlet of the refrigerant channel of the first heat exchange component (i.e., the plate heat exchanger E1). The outlet of the refrigerant channel of the first heat exchange component is connected to the inlet of the replenishment tank C1.

[0038] Specifically, Figure 2 In this system, during operation, the refrigerant flows out from the outlet of the makeup water tank C1, receives circulation power from the circulating water pump P1, and then enters the liquid heater EE. When the system is in heating mode, the liquid heater EE heats the refrigerant according to the control module's instructions, and then the refrigerant enters the refrigerant channel of the first heat exchange component (i.e., plate heat exchanger E1). In the plate heat exchanger E1, the refrigerant exchanges heat with the refrigerant in the refrigerant circuit subsystem, achieving energy transfer. After heat exchange, the refrigerant finally flows back to the makeup water tank C1, forming a complete closed-loop circulation circuit. This water circuit subsystem provides a stable flow rate through the circulating water pump P1, achieves precise temperature control through the liquid heater EE, and maintains system pressure balance and medium compensation through the makeup water tank C1, jointly ensuring the stable operation and heat exchange efficiency of the system under different operating conditions.

[0039] Figure 2The water circuit subsystem also includes: an electric valve VE, which is electrically connected to the control module; the inlet of the electric valve VE is connected to the outlet of the liquid heater, and the inlet of the electric valve VE is connected to the inlet of the refrigerant channel of the second heat exchange component (i.e., the high-efficiency heat exchanger E2); the electric valve VE is used to adjust the opening degree based on the control signal of the control module to regulate the refrigerant flow rate of the second heat exchange component; the outlet of the refrigerant channel of the second heat exchange component is connected to the inlet of the circulating water pump P1.

[0040] Specifically, Figure 2 In this process, the control module sends a command signal to the electric valve VE. The electric valve VE adjusts its valve core position according to the command to regulate the outlet flow cross-sectional area, achieving linear control of the refrigerant flow rate. When the control module opens the electric valve VE, the refrigerant in the main pipeline is diverted to the refrigerant channel of the high-efficiency heat exchanger E2 under the action of pressure difference. The control module precisely controls the mass flow rate of the refrigerant participating in auxiliary heat exchange by adjusting the opening degree of the electric valve VE, thereby adjusting the heat exchange intensity within the high-efficiency heat exchanger E2. After heat exchange, the refrigerant mixes with the mainstream refrigerant at the inlet of the circulating water pump P1. The control module maintains this reflux mode, utilizing the negative pressure characteristics of the pump inlet to ensure stable delivery of the branch fluid and dynamic regulation of the auxiliary heat exchange intensity. This flow distribution and heat exchange control mechanism allows the system to dynamically adjust the proportion of refrigerant participating in auxiliary heat exchange according to real-time operating conditions, achieving precise regulation of the compressor's suction state.

[0041] Figure 2 The water circuit subsystem also includes: a compressor liquid-cooled drive board U1 and an expansion tank ET. The inlet of the compressor liquid-cooled drive board U1 is connected to the outlet of the liquid heater EE, and the outlet of the compressor liquid-cooled drive board U1 is connected to the inlet of the circulating water pump P1. The expansion tank ET is connected to the inlet of the circulating water pump.

[0042] Specifically, Figure 2 In this system, the control module integrates the compressor liquid-cooled drive plate U1 into the refrigerant circuit downstream of the liquid heater EE through piping design. When the refrigerant flows through the compressor liquid-cooled drive plate U1, it absorbs the heat generated by the drive plate through conduction heat exchange, achieving active heat dissipation for the power components. After heat exchange, the refrigerant, carrying heat, flows directly back to the inlet of the circulating water pump P1 and enters the main circulation system. The control module connects the expansion tank ET to the inlet of the circulating water pump P1, utilizing the nitrogen gas bladder structure inside the tank to buffer refrigerant volume fluctuations caused by temperature changes. This connection method allows the expansion tank ET to directly sense system pressure changes and automatically maintain pipeline pressure stability through the compression and expansion of the gas chamber, providing stable suction pressure conditions for the circulating water pump P1.

[0043] Specifically, Figure 2The water circuit subsystem also includes: replenishment pump P2, filter Z1, ball valves V1 and V3, check valve V2, pagoda interface PJ, and safety valve V4. Automatic vent valve V7 is installed at the highest point of the energy storage liquid cooling system.

[0044] In some alternative implementations, such as Figure 2 As shown, the refrigerant circuit subsystem includes: a compressor CPS and a condenser E3, wherein the compressor CPS is electrically connected to the control module; the inlet of the compressor CPS is connected to the outlet of the refrigerant passage of the second heat exchange component, and the outlet of the compressor CPS is connected to the inlet of the condenser E3; the outlet of the condenser E3 is connected to the inlet of the refrigerant passage of the first heat exchange component; and the outlet of the refrigerant passage of the first heat exchange component is connected to the inlet of the refrigerant passage of the second heat exchange component.

[0045] Specifically, Figure 2 During system operation, the refrigerant, after undergoing sufficient heat exchange in the second heat exchange component and reaching a preset superheat, is drawn into the compressor CPS. The control module adjusts the operating frequency of the compressor CPS to control the adiabatic compression of the refrigerant, transforming the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure state. Subsequently, the high-temperature, high-pressure refrigerant enters the condenser E3, where it releases heat to the ambient air through forced convection heat exchange, completing a phase change and transforming into a high-pressure liquid state.

[0046] Specifically, Figure 2 In the first heat exchange component, the high-pressure liquid refrigerant enters and exchanges primary heat with the secondary refrigerant via a plate heat exchanger. The control module monitors system parameters to ensure precise energy transfer within this component. Finally, the refrigerant flows into the second heat exchange component, where it exchanges auxiliary heat with the secondary refrigerant controlled by the electric valve VE, further regulating superheat and completing the entire refrigeration cycle.

[0047] Figure 2 In the process, the fluorine circuit subsystem also includes a temperature sensor T1, which is electrically connected to the control module. The temperature sensor T1 is installed on the fluorine pipeline at the inlet of the compressor CPS and is used to collect the suction temperature of the compressor CPS.

[0048] Specifically, Figure 2 In this system, the control module monitors the refrigerant temperature at the compressor CPS suction port in real time via temperature sensor T1. Temperature sensor T1 transmits the collected suction temperature signal to the control module in real time, providing key process parameters for liquid slugging prevention control.

[0049] Figure 2The fluorine circuit subsystem also includes: filter Z2 and electronic expansion valve VD1, wherein electronic expansion valve VD1 is electrically connected to the control module; filter Z2 and electronic expansion valve VD1 are sequentially installed on the fluorine pipeline between condenser E3 and the first heat exchange component.

[0050] Specifically, Figure 2 In this configuration, at the outlet of condenser E3, the control module precisely controls the refrigerant flow through the electronic expansion valve VD1. The electronic expansion valve VD1 adjusts its opening according to the control module's instructions, throttling and reducing the pressure of the high-pressure liquid refrigerant. The filter Z2, located upstream of the electronic expansion valve VD1, removes any solid impurities that may be present in the refrigerant, ensuring the reliability of the expansion valve. This configuration allows the control module to form a closed-loop control system with the temperature sensor T1 through the precise adjustment of the electronic expansion valve VD1, jointly maintaining the system under optimal operating conditions.

[0051] Specifically, Figure 2 The fluorine circuit subsystem also includes needle valves V5 and V6. Based on the pressure parameters provided by needle valves V5 and V6, and combined with the readings from temperature sensor T1, the control module establishes a complete system condition monitoring system. The fine-tuning characteristics of needle valves V5 and V6 enable the control module to precisely adjust system parameters through accurate valve opening control, ensuring that the fluorine circuit subsystem always operates stably within the set pressure range.

[0052] Specifically, Figure 2 In the system, there are 4 loop paths:

[0053] (1) Path (1): This path is the main pipeline of the water circuit subsystem of the energy storage liquid cooling unit. The refrigerant is output from the replenishment water tank C1, passes through the circulating water pump P1 and the liquid heater EE in sequence, and then directly enters the plate heat exchanger E1 for heat exchange. After passing through the relevant sensors, it is output through the liquid outlet to cool the external battery cells. The plate heat exchanger E1 has two channels for the refrigerant and the coolant respectively. The two media are separated by side plates and do not communicate with each other. Heat transfer is achieved through the spacer stainless steel plate or aluminum plate.

[0054] (2) Path (2): The refrigerant is output from the replenishment tank C1, passes through the circulating water pump P1 and the liquid heater EE, and then enters the high-efficiency heat exchanger E2 through the electric valve VE to exchange heat with the refrigerant in the fluorine circuit subsystem. The temperature of the refrigerant decreases and then returns to the inlet of the circulating water pump P1 through the expansion tank ET to enter the main pipeline circulation. The opening degree of the electric valve is adjusted to allow the higher temperature refrigerant to flow, and the suction temperature is controlled to completely vaporize the liquid refrigerant before it is sucked into the compressor CPS. This prevents the compressor CPS from being damaged by liquid slugging and prevents the refrigeration oil from mixing with the refrigerant and being carried away. The electric valve VE can be adjusted arbitrarily according to the instructions of the control module. The high-efficiency heat exchanger E2 has a dual-channel structure. The refrigerant and the refrigerant are separated by a thin plate or copper. The two fluids flow in opposite directions and exchange heat with each other.

[0055] (3) Path (3): The refrigerant is output from the replenishment tank C1 and passes through the circulating water pump P1 and the liquid heater EE in sequence. It then directly enters the heat dissipation plate channel after the compressor liquid-cooled drive plate U1 to carry away the heat of the compressor liquid-cooled drive plate U1. When the compressor liquid-cooled drive plate U1 is running under high load, the temperature can reach 60℃. At this time, the temperature of the refrigerant is 20~25℃, which can reduce the temperature by 10℃~20℃. At present, most compressor drive plates use cooling fans for heat dissipation, which can only reduce the temperature by 3℃~10℃. Using liquid cooling greatly improves the heat dissipation efficiency. After passing through the compressor liquid-cooled drive plate U1, the refrigerant is collected in Path 2 and enters the main pipeline for circulation through the expansion tank ET. Since the pressure of the main pipeline connected to the inlet of the circulating water pump P1 is low, there is no backflow or reverse flow in Path 1 and Path 2. During normal operation, the refrigerant can only enter the main pipeline in one direction.

[0056] (4) Path (4): This path is the fluorine subsystem pipeline. The refrigerant is squeezed out by the compressor CPS and enters the condenser E3 after passing through the sensors. After passing through the filter and being throttled in the electronic expansion valve VD1, it enters the plate heat exchanger E1 to fully exchange heat with the refrigerant. At this time, the refrigerant is at a lower temperature and carries away the heat of the refrigerant, thus cooling the refrigerant. After heat exchange, the refrigerant flows out of the plate heat exchanger E1 and enters the high-efficiency heat exchanger E2. In the high-efficiency heat exchanger E2, reliable and energy-saving heat exchange is carried out. The incompletely evaporated liquid refrigerant is heated and fully evaporated into a gaseous state before being sucked into the compressor to complete a cycle.

[0057] This embodiment provides a control method for preventing liquid slugging in an energy storage liquid cooling system, applied to the control module of the energy storage liquid cooling system described in the above embodiment, such as... Figure 3 As shown, the method includes:

[0058] Step S1: Obtain the current operating mode of the energy storage liquid cooling system.

[0059] Specifically, the operating modes include: cooling mode, water system heating mode, and refrigerant system heating mode; the modes requiring anti-liquid slugging control are cooling mode and refrigerant system heating mode.

[0060] Step S2: When the current operating mode is determined to be a mode that requires anti-liquid slugging control, obtain the real-time suction temperature of the compressor in the refrigerant circuit subsystem.

[0061] Specifically, the control module performs a safety assessment of the current operating mode based on its built-in anti-liquid slugging control strategy. It determines that due to changes in refrigerant flow characteristics, there is a risk of liquid slugging in cooling mode and refrigerant system heating mode, requiring anti-liquid slugging control. However, the risk of liquid slugging is low in water system heating mode, so this protection function is not activated. Once the anti-liquid slugging control mode is entered, the control module continuously monitors the real-time temperature of the compressor suction port in the refrigerant circuit subsystem using a high-precision temperature sensor, with a sampling frequency of no less than 10Hz, ensuring the real-time nature and accuracy of the data.

[0062] Step S3: Compare the real-time inhalation temperature with the preset temperature range.

[0063] Specifically, the control module compares and calculates the real-time inhalation temperature obtained in step S2 with the preset temperature safety range to obtain the deviation and trend of the current temperature from the target range.

[0064] Step S4: Based on the comparison results, adjust the opening of the electric valve in the water circuit subsystem to adjust the refrigerant flow rate of the second heat exchange component, and then control the real-time suction temperature within the preset temperature range through auxiliary heat exchange.

[0065] Specifically, based on the temperature deviation and its trend, the control module calculates the optimal opening command for the electric valve. By adjusting the opening of the electric valve in the water circuit subsystem, it precisely controls the flow rate of the refrigerant through the second heat exchange component, thereby adjusting the auxiliary heat exchange intensity. This system achieves dynamic adjustment of the compressor suction temperature through forced convection heat exchange between the refrigerant and the refrigerant in the second heat exchange component, ultimately stabilizing the suction temperature within a preset safe range, forming a complete closed-loop control.

[0066] Specifically, in cooling mode and refrigerant system heating mode, the adjustable range of the electric valve opening is 0~100%. The control module controls the opening of the electric valve based on the compressor suction temperature fed back by temperature sensor T1. The preset temperature safety range is a settable value. When the temperature fed back by T1 is less than or equal to the preset temperature safety range, the electric valve is controlled to open wider until it stabilizes within the preset temperature safety range; when the temperature fed back by T1 is greater than the preset temperature safety range, the electric valve is controlled to close narrower until it stabilizes within the preset temperature safety range.

[0067] Specifically, in the water system heating mode, the electric valve is closed.

[0068] It should be noted that the preset temperature safety ranges for cooling mode and refrigerant system heating mode can be the same or different, and users can set them as needed.

[0069] The liquid slugging prevention control method for the energy storage liquid cooling system provided in this embodiment automatically enters the liquid slugging prevention protection process when the system's operating mode requires liquid slugging prevention control, based on a comparison between the compressor's real-time suction temperature and a preset temperature range. It dynamically adjusts the refrigerant flow rate through the second heat exchange component in the water circuit subsystem, thereby achieving precise control of the compressor suction temperature through auxiliary heat exchange between the refrigerant and the refrigerant in the second heat exchange component. This method effectively increases the compressor suction superheat, ensuring that the refrigerant is completely vaporized before entering the compressor, fundamentally solving the compressor liquid slugging problem from a control logic perspective, and significantly improving the safety and reliability of system operation.

[0070] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0071] The following is a detailed reference. Figure 4 The diagram illustrates a structural schematic suitable for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, graphics processor, etc.) 001, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 002 or a program loaded from memory 008 into random access memory (RAM) 003. The RAM 003 also stores various programs and data required for the operation of the electronic device. The processor 001, ROM 002, and RAM 003 are interconnected via bus 004. An input / output (I / O) interface 005 is also connected to bus 004.

[0072] Typically, the following devices can be connected to I / O interface 005: input devices 006 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 007 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 008 including, for example, magnetic tapes, hard disks, etc.; and communication devices 009. Communication device 009 allows electronic devices to exchange data via wireless or wired communication with other devices. Although Figure 4 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0073] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 009, or installed from a memory 008, or installed from a ROM 002. When the computer program is executed by the processor 001, it performs the functions defined in the control method for preventing liquid slugging in an energy storage liquid cooling system according to embodiments of the present invention.

[0074] Figure 4 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0075] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that the computer, processor, microprocessor controller, or programmable hardware includes storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the liquid-sinking prevention control method of the energy storage liquid cooling system shown in the above embodiments is implemented.

[0076] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0077] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An energy storage liquid cooling system, characterized in that, include: The system comprises a control module, a water circuit subsystem, a refrigerant circuit subsystem, a first heat exchange component, and a second heat exchange component. The water circuit subsystem circulates a heat transfer fluid, and the fluorine circuit subsystem circulates a refrigerant. The water circuit subsystem is coupled to the fluorine circuit subsystem through the first heat exchange component to perform main heat exchange; The water circuit subsystem is coupled to the fluorine circuit subsystem through the second heat exchange component to perform auxiliary heat exchange; The control module is electrically connected to the water circuit subsystem and the refrigerant circuit subsystem. The control module is used to adjust the operating parameters of the water circuit subsystem and the refrigerant circuit subsystem, and then adjust the refrigerant flow rate of the second heat exchange component so that the suction temperature of the compressor in the refrigerant circuit subsystem is stabilized within a preset temperature range. The water circuit subsystem includes: a replenishment tank, a circulating water pump, and a liquid heater; The water circuit subsystem also includes: an electric valve, wherein... The electric valve is electrically connected to the control module; The inlet of the electric valve is connected to the outlet of the liquid heater, and the inlet of the electric valve is connected to the inlet of the refrigerant channel of the second heat exchange component. The electric valve is used to adjust the opening degree based on the control signal of the control module, thereby adjusting the refrigerant flow rate of the second heat exchange component. The outlet of the refrigerant channel of the second heat exchange component is connected to the inlet of the circulating water pump; The water circuit subsystem also includes: a compressor liquid-cooled drive plate and an expansion tank, wherein... The inlet of the compressor liquid-cooled drive plate is connected to the outlet of the liquid heater, and the outlet of the compressor liquid-cooled drive plate is connected to the inlet of the circulating water pump. The expansion tank is connected to the inlet of the circulating water pump; The fluorine circuit subsystem includes: a compressor and a condenser, wherein... The compressor is electrically connected to the control module; The compressor inlet is connected to the refrigerant passage outlet of the second heat exchange component, and the compressor outlet is connected to the condenser inlet; The outlet of the condenser is connected to the inlet of the refrigerant passage of the first heat exchange component; The outlet of the refrigerant passage of the first heat exchange component is connected to the inlet of the refrigerant passage of the second heat exchange component; The fluorine circuit subsystem also includes: a temperature sensor, wherein, The temperature sensor is electrically connected to the control module and is installed on the refrigerant line at the inlet of the compressor. The temperature sensor is used to collect the suction temperature of the compressor.

2. The energy storage liquid cooling system according to claim 1, characterized in that, Both the circulating water pump and the liquid heater are electrically connected to the control module. The outlet of the replenishment tank is connected to the inlet of the circulating water pump; The outlet of the circulating water pump is connected to the inlet of the liquid heater; The outlet of the liquid heater is connected to the inlet of the refrigerant channel of the first heat exchange component; The outlet of the refrigerant channel of the first heat exchange component is connected to the inlet of the replenishment water tank.

3. The energy storage liquid cooling system according to claim 1, characterized in that, The fluorine circuit subsystem also includes: a filter and an electronic expansion valve, wherein... The electronic expansion valve is electrically connected to the control module; The filter and the electronic expansion valve are sequentially installed on the fluorine pipeline between the condenser and the first heat exchange component.

4. The energy storage liquid cooling system according to claim 1, characterized in that, The first heat exchange component is a plate heat exchanger, and heat is transferred between the refrigerant channel and the refrigerant channel in the first heat exchange component through a metal plate.

5. A control method for preventing liquid slugging in an energy storage liquid cooling system, characterized in that, The method, which is applied to the control module of the energy storage liquid cooling system according to any one of claims 1 to 4, comprises: Obtain the current operating mode of the energy storage liquid cooling system; When the current operating mode is determined to be a mode that requires anti-liquid slugging control, the real-time suction temperature of the compressor in the refrigerant circuit subsystem is obtained. The real-time inhalation temperature is compared with a preset temperature range; Based on the comparison results, the opening degree of the electric valve in the water circuit subsystem is adjusted to regulate the refrigerant flow rate of the second heat exchange component, and the real-time intake temperature is controlled within the preset temperature range through the auxiliary heat exchange.

6. The method according to claim 5, characterized in that, The operating modes include: cooling mode, water system heating mode, and refrigerant system heating mode; The modes requiring anti-liquid slugging control are the cooling mode and the refrigerant system heating mode.

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