Sunken cold storage device and indirect efficient chilled water storage air conditioning system

Abstract

The invention relates to the technical field of cold storage air conditioners, in particular to a sinking type cold storage device and an indirect type efficient chilled water storage air conditioning system which comprise an air conditioning system, the sinking type cold storage device and a heat exchanger. A first heat exchange pipeline in the heat exchanger is connected into a secondary refrigerant pipeline of the air conditioning system, and a second heat exchange pipeline is connected into a cooling liquid pipeline of the sunken cold storage device, so that heat exchange between the cooling liquid pipeline and the secondary refrigerant pipeline is realized; the sunken cold storage device comprises a cold storage pool body used for storing cooling capacity by storing cooling liquid. The cold accumulation unit comprises a cooling liquid pipeline, and a water pump and a valve which are arranged on the cooling liquid pipeline; and the cooling liquid pipeline and the heat exchanger, the water pump and the valve connected to the cooling liquid pipeline are all located below the lowest working water level of the cold storage pool body. The scheme has the advantages of effectively preventing equipment corrosion and improving the operation reliability of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of cold storage air conditioning, and in particular to a sunken cold storage device and an indirect high-efficiency water cold storage air conditioning system. Background Art

[0002] With rising energy costs and the implementation of peak-valley electricity pricing policies, water-cooled air conditioning systems are gaining widespread application in both industrial and commercial sectors due to their economical advantages of utilizing off-peak electricity to store cold and release it during peak hours. Traditional water-cooled air conditioning systems often combine open cold storage tanks with closed-loop air conditioning systems, transferring cooling energy through heat exchangers. However, existing technologies present numerous technical challenges that need to be addressed in practical applications.

[0003] In terms of system structure, traditional sunken cold storage systems suffer from significant installation flaws. When key components such as heat exchangers, water pumps, and valves are not fully submerged below the minimum operating water level of the cold storage tank, cavitation is highly likely to occur during system operation. This structural flaw not only causes air blockage within the coolant lines, severely impacting heat exchange efficiency, but also causes the water pump impeller to run idle and be damaged. While some systems have attempted to mitigate this issue by adding exhaust devices, this remedial measure increases system complexity and fails to fundamentally address the risk of cavitation.

[0004] Existing cold storage tank designs struggle to balance cold storage efficiency with uniform fluid distribution. Traditional single-chamber cold storage tanks exhibit significant temperature stratification, resulting in inadequate cold extraction. While multi-chamber series structures improve temperature distribution, they also introduce new fluid short-circuiting issues. Especially in large-capacity cold storage systems, coolant tends to preferentially flow through channels with less resistance, resulting in inefficient circulation. This uneven flow not only reduces cold storage density but also wastes energy.

[0005] In terms of system integration, the coordinated control of the air conditioning unit and the cold storage device is significantly inadequate. Traditional systems require a large number of independently operated electric and proportional valves to achieve mode switching. This decentralized control not only increases equipment costs but also leads to hydraulic imbalances due to signal transmission delays. Especially in combined cooling mode, the system struggles to balance the cooling capacity of the unit with the cooling capacity released by the cold storage tank in real time, resulting in frequent cooling shortages and energy waste.

[0006] In view of the above problems, the existing technology is in urgent need of improvement. Summary of the Invention

[0007] In order to solve the above problems, the purpose of the present invention is to provide a sunken cold storage device and an indirect high-efficiency water-cooled storage air-conditioning system, which have the advantages of effectively preventing equipment corrosion and improving system operation reliability.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0009] The present application provides an air conditioning system with a sunken cold storage device. The technical solution is as follows: comprising an air conditioning system, a sunken cold storage device, and a heat exchanger; a first heat exchange pipeline in the heat exchanger is connected to a refrigerant pipeline of the air conditioning system, and a second heat exchange pipeline is connected to a coolant pipeline of the sunken cold storage device, thereby achieving heat exchange between the coolant pipeline and the refrigerant pipeline; the characteristics are:

[0010] The sunken cold storage device includes a cold storage tank body, which is used to store cold energy by storing cooling liquid;

[0011] The cold storage unit includes a coolant pipeline, a water pump and a valve installed on the coolant pipeline;

[0012] The coolant pipeline and the heat exchanger, water pump and valve connected to it are all located below the lowest working water level of the cold storage tank.

[0013] Furthermore, the present application also proposes that the coolant pipeline includes a first coolant pipeline and a second coolant pipeline, which are respectively connected to the cold storage tank body and the two end interfaces of the second heat exchange pipeline of the heat exchanger;

[0014] The second coolant pipeline is connected in parallel with the third coolant pipeline, and the second coolant pipeline and the third coolant pipeline are respectively provided with a cold release pump and a second cold storage pump.

[0015] Furthermore, the present application also proposes that the air conditioning system includes an air conditioning main unit and an air conditioning terminal group composed of a plurality of air conditioning terminals connected in parallel;

[0016] The air conditioner main unit is connected to the air conditioner terminal group via a first refrigerant line and a second refrigerant line to form a loop. The first refrigerant line L1 is sequentially provided with an electric proportional valve V1 and a refrigeration pump 13. A sixth refrigerant line L9 is connected between the first refrigerant line L1 and the second refrigerant line L2. One end of the sixth refrigerant line L9 is connected between the electric proportional valve V1 and the refrigeration pump 13 of the first refrigerant line L1, and the other end is connected to the second refrigerant line L2. An electric proportional valve V4 is provided on the sixth refrigerant line L9.

[0017] ●-The heat exchanger 4 is connected to the air conditioner main unit 1 through the third refrigerant pipe L3 and the fourth refrigerant pipe L4, wherein:

[0018] The third secondary refrigerant pipeline L3 is connected to the first secondary refrigerant pipeline L1 between the air conditioner main unit 1 and the electric proportional valve V1. The first cold storage pump 3 and the electric valve V3 are sequentially installed on the third secondary refrigerant pipeline L3;

[0019] - The fourth secondary refrigerant pipeline L4 is connected to the second secondary refrigerant pipeline L2;

[0020] The third refrigerant line L3 is connected to the first refrigerant line L1 via the fifth refrigerant line L5. One end of the fifth refrigerant line L5 is connected to the first refrigerant line L1 between the electric proportional valve V1 and the refrigeration pump 13, and the other end is connected to the third refrigerant line L3 between the first cold storage pump 3 and the heat exchanger 4. The fifth refrigerant line L5 is provided with an electric proportional valve V2.

[0021] Furthermore, the present application also proposes that an electric proportional valve V5 and an electric proportional valve V6 are respectively provided on the second coolant pipeline and the third coolant pipeline.

[0022] Furthermore, the present application also proposes that at least two rows of parallel cold storage chambers are separated by a partition wall structure in the cold storage tank body;

[0023] Each row of cold storage chambers includes liquid inlet and outlet terminal cavities and circulation terminal cavities at both ends, as well as cold energy storage cavities and fluid acceleration cavities alternately arranged between the liquid inlet and outlet terminal cavities and the circulation terminal cavities;

[0024] The flow terminal cavities of two adjacent rows of cold storage chambers are connected, and the width of the cold storage chamber is greater than the width of the fluid acceleration chamber, the liquid inlet and outlet terminal chamber, and the flow terminal chamber;

[0025] The first two-way pipe and the second two-way pipe are respectively connected to the same side or both sides of the cold storage tank body and communicate with the inlet and outlet terminal cavities of the two rows of cold storage chambers;

[0026] A staggered and circuitous flow channel is formed between the liquid inlet and outlet terminal cavity, the cold energy storage cavity, the fluid acceleration cavity and the circulation terminal cavity.

[0027] Furthermore, the present application also proposes that the partition wall structure includes:

[0028] ● A transverse partition is used to separate at least two rows of cold storage chambers in the cold storage tank body. The transverse partition is provided with a flow port for connecting the flow terminal cavities of two adjacent rows of cold storage chambers;

[0029] An upper baffle, the upper end of which abuts against the top of the cold storage tank body, and a first flow port is formed between the lower end and the bottom;

[0030] A lower baffle, the lower end of which abuts against the bottom of the cold storage tank body, and a second flow port is formed between the upper end and the top;

[0031] The ends of the cold storage tank body are separated from the inlet and outlet liquid terminal cavities by an upper partition;

[0032] The upper and lower partitions are staggered to form a circuitous flow channel and liquid inlet and outlet terminal cavities, cold energy storage cavities, fluid acceleration cavities, and flow terminal cavities.

[0033] Furthermore, the present application also proposes that a first liquid distribution pipe is provided at the inner end of the first two-way pipe, and a second liquid distribution pipe is provided at the inner end of the second two-way pipe;

[0034] The first liquid distribution pipe and the second liquid distribution pipe are arranged along the length direction of the liquid inlet and outlet terminal cavity;

[0035] The first liquid distribution pipe has a plurality of first liquid distribution ports distributed along its length, and the second liquid distribution pipe has a plurality of second liquid distribution ports distributed along its length;

[0036] The liquid outlet directions of the first liquid distribution port and the second liquid distribution port are away from the first flow port between the upper partition plate and the inner wall of the cold storage tank body.

[0037] Furthermore, the present application also proposes that a ladder shaft is provided on one side of the cold storage tank body, and inspection doors are provided on the upper partition, lower partition and transverse partition, or an inspection port is provided at the upper end of the cold storage tank body corresponding to each cold storage energy storage cavity.

[0038] Furthermore, the present application also proposes that the first liquid distribution pipe and the second liquid distribution pipe are arranged at positions that meet the following requirements:

[0039] a) higher than the height of the first flow opening at the lower end of the upper baffle;

[0040] b) It is lower than the lowest design water level of the cold storage tank body, and the lowest design water level is higher than the height of the upper end of the lower partition.

[0041] Furthermore, the present application also proposes that a cold storage chamber in the middle section is separated by a partition wall structure in the cold storage tank body;

[0042] The cold storage chamber in the middle section includes flow terminal cavities at both ends, and cold energy storage cavities and fluid acceleration cavities alternately arranged between the flow terminal cavities;

[0043] The flow terminal cavities on both sides of the cold storage chamber in the middle section are connected to the flow terminal cavities of the adjacent cold storage chambers.

[0044] From the above, it can be seen that the air-conditioning system and its cold storage tank structure with a sunken cold storage device provided in this application effectively avoid cavitation and water pump emptying problems by completely immersing the coolant pipeline and its ancillary equipment below the minimum working water level, and has the advantages of reducing cavitation risks and improving system operation reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of an air-conditioning system with a sunken cold storage device.

[0046] Figure 2 The diagram is a top view of a cold storage device for a central air conditioning system.

[0047] Figure 3 For the cold storage process Figure 2 AA cross-sectional view diagram.

[0048] Figure 4 For the cold storage process Figure 2 Schematic diagram of the BB cross-section.

[0049] Figure 5 This is a schematic top view of a cold storage device provided in the present application having four rows of cold storage chambers arranged in parallel. DETAILED DESCRIPTION

[0050] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise explicitly specified.

[0053] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0055] In existing technologies, water-cooled air conditioning systems utilize valley power storage and peak power release to achieve economical operation, but these systems have exposed a series of technical bottlenecks during long-term operation. Traditional systems combine an open cold storage tank with a closed air conditioning system to transfer cooling through a heat exchanger. During downtime for maintenance, this type of system is prone to residual air in the pipes, causing oxidation corrosion of the copper heat exchange tubes and the inner walls of the metal pipes. Long-term accumulation will reduce heat exchange efficiency and shorten the life of the equipment. Furthermore, the water pump on the open cold storage tank side is often installed at a higher level than the cold storage tank liquid level, making it easy for air to be pumped out during startup and shutdown, causing cavitation and damage to the equipment.

[0056] To address the aforementioned issues, the R&D team conducted a systematic analysis of pipeline corrosion, vacuum phenomena, and control complexity. They discovered that the root cause of the corrosion problem lies in the coexistence of gas and liquid due to incomplete immersion of the pipeline, the vacuum phenomenon stems from insufficient pressure at the water pump inlet, and the control complexity stems from the need to coordinate multiple devices. Therefore, they envisioned maintaining full immersion of the pipeline through physical structural improvements, while optimizing component layout and simplifying control logic. After fluid mechanics calculations and system simulation verification, they determined a design solution that would sink the key components of the cold storage device below the liquid level. This design eliminates the chance of gas-liquid contact and utilizes liquid static pressure to maintain water pump inlet pressure, ultimately forming an integrated sinking structure solution.

[0057] like Figure 1-5 As shown, this embodiment relates to an air conditioning system with a sunken cold storage device, comprising a technical solution for the air conditioning system, the sunken cold storage device, and a heat exchanger 4. The heat exchanger 4 is provided with an independent first heat exchange pipeline 41 and a second heat exchange pipeline 42, which are connected to the air conditioning system's refrigerant pipeline and the coolant pipeline of the cold storage device, respectively. The sunken cold storage device includes a cold storage tank body 100 for storing coolant, and a cold storage unit with an integrated water pump and valve. The coolant pipeline and the connected heat exchanger 4, water pump, and valve are all located below the lowest operating water level of the cold storage tank body 100.

[0058] Among them, the cold storage tank body 100 refers to a container structure for storing coolant, which can be specifically implemented by reinforced concrete casting or stainless steel and other structures, and its volume is determined according to the cooling demand. This solution system supports a variety of cooling liquids (such as cooling water, ethylene glycol solution or nanofluid), and the capacity of the cold storage tank body 100 and the pump group parameters can be adjusted according to the specific heat capacity and thermal conductivity of the liquid to optimize the energy efficiency of the system. The cold storage tank body 100 is made of brick-concrete material or corrosion-resistant material (such as stainless steel or high-density polyethylene, etc.) to adapt to the chemical properties of different cooling liquids. The cold storage tank body 100 can adopt a non-pressure-bearing closed design to ensure the stability of the cooling liquid.

[0059] The cold storage unit is a power unit consisting of a water pump and valves. The minimum operating water level is the lowest liquid level maintained during operation of the cold storage tank 100. This level can be dynamically controlled through a level sensor linked to the water replenishment system. The coolant line is the closed-loop conduit connecting the cold storage tank 100 and the heat exchanger 4. It can be made of stainless steel or other corrosion-resistant materials and remains below the liquid level throughout its entire length.

[0060] Specifically, the air conditioning system's refrigerant circulates in a closed loop, exchanging heat with the coolant in the cold storage tank body 100 through the first heat exchange pipeline 41. In a sunken cold storage device, the coolant pipeline and its associated equipment are always below the liquid level in the cold storage tank body 100, ensuring that the pipeline is completely filled with liquid. When the system is in operation, the cold storage unit's water pump drives the coolant to circulate through the pipeline, transferring the cold energy to the heat exchanger 4. When the system is shut down, the coolant in the cold storage tank body 100 continuously fills the pipeline system with coolant, isolating it from air. Because the water pump inlet is located below the liquid level, it can directly utilize the static pressure of the liquid to generate a stable water flow during startup, preventing cavitation. Through the above technical solution, this application effectively solves the problem of equipment corrosion caused by incompletely filled pipelines, ensuring that metal components remain protected by liquid at all times. The risk of pump evacuation during startup is completely eliminated, and stable operating conditions are maintained by utilizing the static pressure of the liquid. This also simplifies the air conditioning system's control structure, reducing the number of valves and hydraulic control links through physical layout optimization, thereby improving system reliability and operational efficiency.

[0061] In the specific technical solution, the coolant pipeline includes a first coolant pipeline L6 and a second coolant pipeline L7, which respectively connect the cold storage tank body 100 to the two ends of the second heat exchange pipeline 42 of the heat exchanger 4. A third coolant pipeline L8 is connected in parallel to the second coolant pipeline L7. A cold release pump 34 and a second cold storage pump 35 are respectively provided on the second coolant pipeline L7 and the third coolant pipeline 33. The first coolant pipeline L6 is a pipe connecting the cold storage tank body 100 to one end of the second heat exchange pipeline 42 of the heat exchanger 4. Specifically, it can be a pipe section made of stainless steel or corrosion-resistant material. It is used to transport coolant from the cold storage tank body 100 to the heat exchanger 4 in the cold storage state and from the heat exchanger 4 to the cold storage tank body 100 in the cold release state. The second coolant pipeline L7 is a pipe connecting the outlet end of the second heat exchange pipeline 42 of the heat exchanger 4 to the cold storage tank body 100, forming a circulation loop with the first coolant pipeline L6. The third coolant line L8 is a branch pipe connected in parallel to the second coolant line L7. Its ends are connected to the inlet and outlet sections of the second coolant line L7, respectively. This allows the coolant release pump 34 and the second coolant storage pump 35 to form independent circulation paths. The coolant release pump 34 is a centrifugal pump installed on the second coolant line L7. Its installation height is lower than the lowest water level of the coolant reservoir body 100 to ensure that the pump chamber is always filled with coolant. The second coolant storage pump 35 is a centrifugal pump installed on the third coolant line L8. Its installation height is lower than the designed water level of the coolant reservoir body 100 to prevent air inhalation during operation.

[0062] Specifically, in the cooling mode, the cooling pump 34 is activated to drive the coolant through the second coolant line L7, the second heat exchange line 42 of the heat exchanger 4, and the first coolant line L6, transferring the cold to the secondary coolant. In the cooling mode, the second cold storage pump 35 is activated to drive the coolant through the first coolant line L6, the heat exchanger 4, and the third coolant line L8, storing the cold in the secondary coolant in the cold storage tank body 100. Because the cooling pump 34 and the second cold storage pump 35 are respectively deployed in two parallel pipelines, the two pumps can be controlled independently without interfering with each other. The cooling pump 34 and the second cold storage pump 35 are both installed below the lowest water level in the cold storage tank body 100, ensuring that the pumps and pipelines are always filled with coolant, preventing cavities caused by water level fluctuations. When switching operating modes, only the corresponding water pumps and valves need to be started and stopped, simplifying the control instructions. Through the above technical solution, the present application effectively prevents the pump body from being evacuated during startup, ensuring the stable operation of the coolant circulation system. The pump body is always filled with coolant, isolating it from air and reducing the risk of pipeline corrosion. Independent control circuits simplify operating logic, reducing the number of electric valves used and the computing load of the central controller, thereby reducing operation and maintenance costs.

[0063] In this solution, electric proportional valves V5 and V6 are installed on the second coolant line L7 and the third coolant line L8, respectively. Electric proportional valve V5 is a flow control device installed on the second coolant line L7, specifically a linear electric control valve. Its built-in control signal receives external commands to continuously adjust the valve core opening. Electric proportional valve V6 is a flow control device installed on the third coolant line L8, specifically a angular electric control valve. It precisely controls the flow cross-sectional area of the line by varying the valve plate rotation angle.

[0064] Specifically, electric proportional valve V5 is connected in series with the coolant release pump 34, and V6 is connected in series with the second coolant storage pump 35. When switched to coolant release mode, the coolant release pump 34 circulates coolant through the second coolant line L7 and the first coolant line L6. The regulation signal for V5 is derived from the inlet and outlet temperature differential feedback on the cold-carrying side of the heat exchanger 4. When switched to coolant storage mode, the second coolant storage pump 35 circulates coolant through the first coolant line L6 and the third coolant line L8. The regulation signal for V6 is based on the inlet and outlet temperature differential of the coolant storage tank 100 and the required coolant storage temperature. When either V5 or V6 is operating, the other must be off.

[0065] Normally, when the cooling water pump 34 and the second cooling water pump 35 are fixed-frequency water pumps, V5 and V6 use electric proportional valves; when the cooling water pump 34 and the second cooling water pump 35 are variable-frequency water pumps, V5 and V6 can use electric valves. At this time, the flow regulation function of the variable-frequency water pump is used to achieve the purpose of temperature control. Through the above technical solution, the present application effectively solves the mutual interference problem during the flow regulation of parallel coolant pipelines and eliminates the hydraulic oscillation phenomenon caused by valve action lag. This technical solution realizes the flow decoupling control of cooling storage and cooling release conditions by physically isolating the proportional valves, which significantly improves the operational stability.

[0066] like Figure 1 As shown, the air-conditioning system includes an air-conditioning main unit 1 and an air-conditioning terminal group consisting of a plurality of air-conditioning terminals 5 connected in parallel; the air-conditioning main unit 1 is connected to the air-conditioning terminal group through a first refrigerant pipeline L1 and a second refrigerant pipeline L2 to form a loop, and the first refrigerant pipeline L1 is sequentially provided with an electric proportional valve V1 and a refrigeration pump 13; a sixth refrigerant pipeline L9 is connected between the first refrigerant pipeline L1 and the second refrigerant pipeline L2; one end of the sixth refrigerant pipeline L9 is connected between the electric proportional valve V1 of the first refrigerant pipeline L1 and the refrigeration pump 13, and the other end is connected to the second refrigerant pipeline L2; the sixth refrigerant pipeline L9 is provided with an electric proportional valve V4

[0067] The heat exchanger 4 is connected to the air conditioner main unit 1 through the third refrigerant pipeline L3 and the fourth refrigerant pipeline L4, wherein: the third refrigerant pipeline L3 is connected to the first refrigerant pipeline L1 between the air conditioner main unit 1 and the electric proportional valve V1, and the first cold storage pump 3 and the electric valve V3 are sequentially provided on the third refrigerant pipeline L3; the fourth refrigerant pipeline L4 is connected to the second refrigerant pipeline L2; the third refrigerant pipeline L3 is connected to the first refrigerant pipeline L1 through the fifth refrigerant pipeline L5, one end of the fifth refrigerant pipeline L5 is connected to the first refrigerant pipeline L1 between the electric proportional valve V1 and the refrigeration pump 13, and the other end is connected to the third refrigerant pipeline L3 between the first cold storage pump 3 and the heat exchanger 4, and the fifth refrigerant pipeline L5 is provided with an electric proportional valve V2.

[0068] Among them, the air-conditioning terminal parallel group refers to multiple air-conditioning terminals 5 connected in parallel to form a terminal branch network. Specifically, the branch flow distribution can be achieved by using a water distributor and a water collector, or the branch flow distribution can be achieved by using a same-path method to avoid flow competition between branches caused by different paths. The first refrigerant pipeline L1 and the second refrigerant pipeline L2 refer to the host cooling delivery channel that constitutes a closed loop between the air-conditioning host 1 and the terminal group. The fifth refrigerant pipeline L5 and part of the L3 pipeline and the fourth refrigerant pipeline L4 refer to the heat exchanger 4 connected in parallel to the host cooling delivery channel, forming a cold storage tank cooling delivery channel. The three modes of host cooling, cold storage tank cooling, or host and cold storage tank cooling can be automatically switched according to the use scenario of the air-conditioning terminal. These three working modes are all powered by the refrigeration pump 13 to form a forced circulation path for cold transmission.

[0069] In the specific scheme, the electric proportional valve V1 and the electric proportional valve V2 refer to flow control devices whose opening can be adjusted by electrical signals. Specifically, butterfly valves or ball valves driven by stepper motors can be used to dynamically balance the flow ratio in the main unit cooling mode, cold storage tank cooling mode, or the main unit and cold storage tank combined cooling mode.

[0070] Specifically, multiple air conditioner terminals 5 are connected in parallel to form multiple air conditioner terminal branches. Each branch is connected to the main unit's cooling supply channel through a manifold and a manifold, eliminating the risk of flow imbalance caused by pressure differences between branches. The refrigerant output by the main unit 1 flows to the terminal group through the first refrigerant pipeline L1. The refrigeration pump 13 provides circulation power. The electric proportional valve V1 regulates the flow rate in the main unit's cooling supply channel. The refrigerant then flows back to the main unit through the second refrigerant pipeline L2.

[0071] When switching to cold storage cooling mode, heat exchanger 4 is independently connected to the main unit's cooling supply channel via the fifth and fourth secondary refrigerant lines L5 and L4. Circulation power is still provided by the refrigeration pump 13, and cold energy is directly transferred from the cold storage side to the terminal group. The electric proportional valves V1 and V3 are closed, eliminating the need for cold energy to flow through the internal flow path of the air conditioner main unit 1. The electric proportional valve V2 on the fifth secondary refrigerant line L5 adjusts its opening to dynamically distribute the flow to the terminal group.

[0072] When it is necessary to switch to the joint cooling mode of the main unit and the cold storage tank, the circulation power is still provided by the refrigeration pump 13. Through the linkage control of the electric proportional valve V1 and the electric proportional valve V2, the system can achieve continuous flow regulation in the joint cooling mode without frequently opening and closing valves or adjusting the water pump speed.

[0073] Through the above technical solution, this application solves the hydraulic oscillation problem caused by frequent valve operation in traditional air-conditioning systems, reduces the number of control elements by optimizing the pipeline topology, and uses the dynamic adjustment of the electric proportional valve to achieve a smooth transition of multi-mode cooling switching, thereby improving the system operation stability.

[0074] In this specific embodiment, the third and fourth secondary refrigerant lines L3 and L4 constitute the cold storage and transport channels that form a closed loop between the heat exchanger 4 and the air conditioner main unit 1. In cold storage mode, the air conditioner main unit 1 and heat exchanger 4 are connected in series. With electric proportional valves V1 and V2 closed and electric valve V3 open, circulation power is provided by the first cold storage pump 3 on the secondary side and by the second cold storage pump 35 on the cooling side.

[0075] In the specific embodiment, the ninth refrigerant line L9 constitutes the refrigerant channel between the supply and return water of the air conditioning terminal unit. The electric proportional valve V4 functions as a mixing valve. When the outlet temperature of the refrigerant delivered to the air conditioning terminal unit is too low, the opening of the electric proportional valve V4 is adjusted to mix some of the higher-temperature refrigerant return water with the cold water from the air conditioning unit 1 or heat exchanger 4, bringing the outlet temperature of the refrigerant to the required level. When the cold water released from the cold storage tank 100 is at a low temperature, while the air conditioning terminal unit requires a higher water temperature, the mixing valve V4 effectively regulates the temperature.

[0076] like Figure 2-4As shown, at least two rows of cold storage chambers arranged in parallel are separated by a partition wall structure in the cold storage tank body 100, and each row of cold storage chambers includes an inlet and outlet liquid terminal chamber 201 and a circulation terminal chamber 202 located at both ends, and a cold storage energy storage chamber 203 and a fluid acceleration chamber 204 alternately arranged between the inlet and outlet liquid terminal chamber 201 and the circulation terminal chamber 202. The circulation terminal chambers 202 of two adjacent rows of cold storage chambers are connected, and the chamber width of the cold storage energy storage chamber 203 is greater than the chamber width of the fluid acceleration chamber 204, the inlet and outlet liquid terminal chamber 201 and the circulation terminal chamber 202. The first two-way tube 101 and the second two-way tube 102 are respectively connected to the same side or both sides of the cold storage tank body 100, and are communicated with the inlet and outlet liquid terminal chambers 201 of the two rows of cold storage chambers, forming an interlaced and circuitous flow channel between the inlet and outlet liquid terminal chamber 201, the cold storage energy storage chamber 203, the fluid acceleration chamber 204 and the circulation terminal chamber 202.

[0077] The partition wall structure refers to a structure that divides the interior of the cold storage tank body 100 into multiple rows of parallel chambers. Specifically, this can be achieved by using a combination of concrete or steel plates to form transverse partitions 300 and longitudinal partitions. The transverse partitions 300 are used to separate different rows of cold storage chambers, and the longitudinal partitions are used to form the boundaries of a single chamber. The cold storage chamber 203 refers to a wide chamber used to store cooling liquid and prevent the disordered mixing of medium-temperature water and low-temperature water. Specifically, this can be achieved by forming a wide-cross-section flow channel with a larger partition spacing. The wide cross-section slows down the fluid velocity to form a thinner oblique temperature layer, thereby enhancing cold storage. The fluid acceleration chamber 204 refers to a narrow chamber that accelerates fluid flow by shrinking the cross section. Specifically, this can be achieved by narrowing the partition spacing or setting a tapered channel structure. The first two-way pipe 101 and the second two-way pipe 102 refer to supply and return liquid pipes connected to the same side or both sides of the cold storage tank body 100, which drive the fluid to circulate in the circuitous flow channel through a two-way pressure difference. Among them, the first two-way tube 101 and the second two-way tube 102 are on the same side, which is suitable for the even-numbered rows of cold storage chambers, as shown in the attached drawings of this case; the first two-way tube 101 and the second two-way tube 102 are on both sides, which is suitable for the odd-numbered rows of cold storage chambers.

[0078] Specifically, after the cooling liquid enters the liquid inlet and outlet terminal cavity 201 on one side through the first two-way tube 101, a circuitous flow path is formed along the staggered cold storage cavity 203 and the fluid acceleration cavity 204. The wide-section cold storage cavity 203 allows the fluid to slow down and prolong the residence time, while the narrow-section fluid acceleration cavity 204 increases the flow rate. The two adjacent rows of cold storage chambers are connected through the flow terminal cavity 202 to form a three-dimensional circulation network, reducing the dead water area formed by single-row flow. After the fluid completes cold storage in the cold storage cavity 203, it is accelerated through the fluid acceleration cavity 204 to enter the next row of chambers, and finally flows out through the second two-way tube 102.

[0079] In a specific embodiment, the partition wall structure includes a transverse partition 300, an upper partition 302, and a lower partition 304. The transverse partition 300 separates at least two rows of cold storage chambers within the cold storage tank body 100. A flow port 301 is provided on the transverse partition 300 to connect the flow terminal chambers 202 of the two adjacent rows of cold storage chambers. The upper end of the upper partition 302 abuts the top of the cold storage tank body 100, and a first flow port 303 is formed between the lower end and the bottom. The lower end of the lower partition 304 abuts the bottom of the cold storage tank body 100, and a second flow port 305 is formed between the upper end and the top. The end of the cold storage tank body 100 is separated from the inlet and outlet terminal chambers 201 by the upper partition 302. The upper partition 302 and the lower partition 304 are staggered to form a circuitous flow channel and the inlet and outlet terminal chambers 201, the cold energy storage chamber 203, the fluid acceleration chamber 204, and the flow terminal chamber 202. Among them, the transverse partition 300 refers to a partition component extending in the horizontal direction, which can be specifically realized by using a reinforced concrete prefabricated plate or a steel plate welded structure. Its function is to divide the cold storage tank body 100 into multiple rows of parallel flow channels, reduce the volume of the inclined temperature layer where the medium-temperature water and the low-temperature water come into contact, and meet the engineering requirements of connecting the inlet and outlet terminal cavities 201 on the same side or connecting the terminals on both sides.

[0080] The upper baffle 302 is a vertically mounted baffle structure, specifically a brick-concrete partition wall or steel plate flush with the tank roof. By completely blocking the top space, it forces fluid to flow through the first flow port 303 at the bottom, eliminating cavities caused by liquid level fluctuations. The upper baffle 302 can be directly fixed to the top of the reservoir body. Alternatively, it can be supported from the bottom by spaced-apart legs. This maintains the first flow port 303 at the bottom while also achieving top abutment. The lower baffle 304 is a vertical structure fixed to the tank floor, specifically a brick-concrete partition wall or steel plate. By restricting fluid flow to only through the second flow port 305 at the top, it creates a flow direction opposite to that of the upper baffle 302. The flow port 301 is a hole in the transverse baffle 300, specifically a circular or rectangular opening, that allows fluid flow and balances fluid pressure between adjacent rows of chambers. The first flow port 303 is the gap between the lower end of the upper baffle 302 and the pool bottom, guiding the fluid to form a top-down flow path. The second flow port 305 is the gap between the upper end of the lower baffle 304 and the pool top, creating a complementary bottom-up flow path. The staggered arrangement refers to the asymmetrical arrangement of the upper and lower baffles 302, 304, extending the fluid path by changing the flow direction.

[0081] Specifically, the transverse baffles 300 divide the cold storage tank body 100 into multiple rows of parallel chambers. Each row of chambers uses a flow port 301 for fluid flow and pressure balance, reducing the volume of the oblique temperature layer where the medium-temperature water and low-temperature water meet during the cold release or cold storage process. This also meets the engineering requirements of connecting the inlet and outlet terminals 201 to the same side or to both sides. The upper baffle 302 completely blocks the top space, forcing the fluid to enter the next chamber through the first flow port 303 at the bottom. The lower baffle 304 establishes a bottom-up flow path through the second flow port 305, complementing the top-down flow formed by the upper baffle 302, achieving the conversion of fluid kinetic energy and potential energy in alternating flow directions. The staggered arrangement of the upper and lower baffles 302 and 304 forms a continuous S-shaped flow channel. The fluid decelerates and stores energy in the wide cross-section of the cold storage chamber 203 and accelerates in the narrow cross-section of the fluid acceleration chamber 204. The alternating flow rate changes maintain overall flow stability.

[0082] Furthermore, a first liquid distribution pipe 401 is provided at the inner end of the first bidirectional tube 101, and a second liquid distribution pipe 402 is provided at the inner end of the second bidirectional tube 102. The first and second liquid distribution pipes 401, 402 are arranged along the length of the inlet and outlet terminal cavity 201. The first liquid distribution pipe 401 has multiple first liquid distribution ports 403 distributed along its length, while the second liquid distribution pipe 402 has multiple second liquid distribution ports 404 distributed along its length. The first and second liquid distribution ports 403, 404 direct liquid outflow away from the first flow port 303 between the upper partition 302 and the inner wall of the cold storage tank body 100. The first liquid distribution pipe 401 is a piping device used to evenly distribute coolant to or collect coolant from the interior of the cold storage tank body 100. Specifically, it can be a tubular structure extending along the length of the inlet and outlet terminal cavity 201, with multiple liquid distribution ports defined in the pipe wall to achieve multi-point diffusion of the fluid. The second liquid distribution pipe employs the same structure as the first liquid distribution pipe, arranged symmetrically. The first liquid distribution port 403 is an opening on the first liquid distribution pipe 401. Specifically, it can be a circular or rectangular hole, evenly spaced along the length of the pipe. Adjusting the aperture size controls the flow distribution at each point. The second liquid distribution port 404 is arranged in the same manner on the second liquid distribution pipe 402 to ensure symmetry in the fluid output of the two pipes.

[0083] Among them, the liquid outlet direction is back to the first flow port 303, which means that the injection direction of the liquid distribution port is opposite to the fluid guiding direction of the first flow port 303. This can be achieved by adjusting the installation angle of the liquid distribution pipe or the inclination angle of the liquid distribution port, so that the initial flow direction of the coolant forms an opposite relationship with the adjacent chamber inlet, avoiding direct short-circuiting of the fluid into the downstream area.

[0084] Specifically, when the coolant enters the cold storage tank body 100 through the first two-way pipe 101 or the second two-way pipe 102, it is first distributed through the first liquid distribution pipe 401 or the second liquid distribution pipe 402. The first liquid distribution pipe 401 and the second liquid distribution pipe 402 extend along the length of the liquid inlet and outlet terminal cavity 201. Combined with the evenly distributed liquid distribution ports, the coolant can be dispersed and injected into multiple areas of the cavity to avoid local flow concentration. The liquid outlet direction of the first liquid distribution port 403 and the second liquid distribution port 404 is away from the first flow port 303, so that after the fluid enters the cavity, it first diffuses in the direction away from the adjacent cavity entrance, and then forms a stable laminar flow in the circuitous flow channel. This flow mode reduces the fluid short-circuiting phenomenon caused by the liquid flowing directly to the first flow port 303, ensuring that the coolant flows evenly in the upper half of the first liquid distribution pipe 401 or the second liquid distribution pipe 402 of the liquid inlet and outlet terminal cavity 201, thereby increasing the amount of cold storage and cold release. At the same time, the reversed liquid discharge design delays the time it takes for fluid to enter adjacent chambers, reducing turbulent mixing and maintaining the stability of the thermocline layer. This solution achieves uniform coverage and orderly flow of coolant throughout the cold storage tank body 100 through the even distribution of multiple liquid distribution ports and the reversed liquid discharge design. The symmetrical arrangement of the first and second liquid distribution pipes 401, 402 and the reversed liquid discharge design ensure stable laminar flow of coolant between the various chambers of the cold storage tank body 100, reducing turbulent flow that disrupts the thermocline layer and improving the operational reliability of the cold storage system.

[0085] Furthermore, the first liquid distribution pipe 401 and the second liquid distribution pipe 402 are positioned so as to be higher than the first flow port 303 at the lower end of the upper partition 302 and lower than the minimum design water level of the cold storage tank body 100, which is higher than the height of the upper end of the lower partition 304. The height of the first flow port 303 refers to the height of the gap between the lower end of the upper partition 302 and the bottom of the cold storage tank body 100. This can be achieved by reserving a flow cross-section at the bottom of the partition. This design ensures that the fluid forms a stable circulation in the circuitous flow channel. The minimum design water level refers to the lowest level of the coolant when the cold storage tank body 100 is in operation. This can be achieved by dynamically monitoring the level by installing a water level sensor on the side wall of the tank body. This height limit ensures that the liquid distribution pipe is always submerged. The height of the upper end of the lower baffle 304 refers to the gap between the top of the lower baffle 304 and the top of the cold storage tank body 100. The height and width of this gap can be adjusted based on the flow rate and flow rate requirements, depending on the minimum liquid level. This height setting prevents the minimum water level from falling below the top of the baffle, causing fluid disconnection or excessive flow. Specifically, the positions of the first and second liquid distribution pipes 401 and 402 are restricted to a range above the first flow port 303 and below the minimum design water level. When the cold storage tank body 100 is at the lowest operating water level, the liquid distribution pipes remain fully submerged, preventing air from entering the pipes and causing cavity corrosion or pump evacuation. At the same time, the liquid outlet direction of the liquid distribution port, facing away from the first flow port 303, counteracts the flow path, promoting uniform diffusion of the fluid within the inlet and outlet terminal cavity 201. The condition that the minimum design water level is above the upper end of the lower baffle 304 ensures that the fluid must flow through all chambers of the circuitous flow path. Through the above technical solution, the present application effectively prevents the liquid distribution pipe from being disconnected or flowing too fast when the cold storage tank is running at a low water level, eliminates the oxidation corrosion of metal parts or the water pump vacuum caused by oxygen contact; at the same time, ensures that the coolant is evenly distributed in the cold storage chamber, avoiding the decrease in cold storage or release efficiency caused by local excessively high or low flow rates; in addition, the design does not rely on additional sealing structures or frequent water replenishment operations to maintain stable operation of the system.

[0086] Furthermore, a stairwell 500 is provided on one side of the cold storage tank body 100, and an inspection door 501 is provided on the upper partition 302, the lower partition 304 and the transverse partition 300, or an inspection port is provided at the upper end of the cold storage tank body 100 corresponding to each cold storage energy storage cavity 203. The stairwell 500 refers to a vertical passage connected to the side wall of the cold storage tank body 100 and extending to the bottom of the tank. Specifically, it can be implemented by a steel structure or a concrete structure, with a ladder or a step ladder provided inside. Its function is to provide a safe path for maintenance personnel to enter the interior of the tank body. The inspection door 501 refers to an openable structure installed on the upper partition 302, the lower partition 304 and the transverse partition 300. Specifically, it can be implemented by a steel door with a sealing strip. Its function is to directly connect the adjacent chambers by opening the door body on the partition to avoid structural damage caused by the removal of the partition wall. The inspection port refers to a closable opening at the top of the cold storage tank body 100. Specifically, it can be implemented using a cover structure with a flange connection. Its function is to directly clean the cold storage chamber 203 or replace components through the top opening. Specifically, the ladder shaft 500 is set vertically along the side wall of the cold storage tank body 100. After entering the bottom of the tank through the ladder shaft 500, maintenance personnel can enter the cold storage chambers in different rows through the inspection door 501 of the transverse partition 300. When maintenance is required on a chamber separated by a specific partition, the inspection door 501 corresponding to the upper partition 302 or lower partition 304 can be opened to directly enter the inner part of the circuitous flow channel. In another solution, for the cold storage chamber 203, when a top inspection port is used instead of the partition inspection door 501, maintenance personnel do not need to enter the interior of the tank body; they only need to open the cover at the corresponding position to carry out cleaning operations. Therefore, both solutions ensure the accessibility of all chambers by optimizing the layout of physical channels and openings, and are particularly suitable for complex flow channel structures separated by partition walls. Through the above technical solution, this application effectively solves the problem of difficult maintenance due to the complex structure of the internal chamber of the cold storage tank, improves the convenience and safety of maintenance operations, and significantly reduces the risk of cold loss or pipe blockage due to inconvenient maintenance.

[0087] like Figure 5 In another embodiment shown, a middle section of the cold storage chamber is separated by a partition wall structure in the cold storage tank body 100. The middle section of the cold storage chamber includes a circulation terminal chamber 202 located at both end portions, and a cold storage energy storage chamber 203 and a fluid acceleration chamber 204 alternately arranged between the circulation terminal chambers 202. The circulation terminal chambers 202 on both sides of the middle section of the cold storage chamber are connected to the circulation terminal chambers 202 of the adjacent cold storage chambers.

[0088] The middle section of the cold storage chamber refers to the collection of chambers located in the central area of the cold storage tank body 100. It is separated from the chambers on both sides by a transverse partition 300, which can be made of concrete or steel plates. The circulation terminal chamber 202 is a transition zone located at each end of the chamber for fluid inflow and outflow. Specifically, the circulation port 301 on the transverse partition 300 guides the liquid to the adjacent chamber for circulation. The cold energy storage chamber 203 is a wide chamber used to store cooling liquid.

[0089] Specifically, the partition wall structure divides the cold storage tank body 100 into multiple rows of parallel chambers. Circulation terminal cavities 202 are located at either end of the middle chamber. These chambers are isolated from adjacent chambers by transverse partitions 300, but flow openings 301 are retained between the circulation terminal cavities 202. Cold energy storage cavities 203 and fluid acceleration cavities 204 are alternately arranged between the circulation terminal cavities 202. Liquid flowing into one circulation terminal cavity 202 first enters the cold energy storage cavity 203 for temporary storage, then is accelerated by the fluid acceleration cavity 204 and directed to the next circulation terminal cavity 202. The circulation terminal cavities 202 of adjacent chambers are connected by reserved channels, allowing liquid to flow in a circuitous manner between different chambers. For example, cooling liquid enters one circulation terminal cavity 202 of the middle chamber, flows sequentially through the cold energy storage cavity 203 and the fluid acceleration cavity 204 to reach the other circulation terminal cavity 202, and then enters the circulation terminal cavity 202 of the adjacent chamber through the flow opening 301 to continue circulation. Through the above technical solution, the present application solves the problem of uneven fluid distribution caused by unreasonable chamber structure in traditional water cold storage systems. The alternating chamber design allows the cooling liquid to form a stable circuitous path in the cold storage tank body 100, avoiding the disordered mixing of medium-temperature water and low-temperature water, and improving the efficiency of cold storage or release. The wide-body structure of the cold storage chamber 203 reduces the flow rate and reduces the thickness of the oblique temperature layer. The narrow flow channel of the fluid acceleration chamber 204 increases the flow rate, reducing the volume of non-flowing coolant retained in the cold storage chamber 203. The symmetrical connection design of the circulation terminal chamber 202 ensures the continuity of the coolant circulation, ensuring that the system can maintain stable operation under both cold storage and cold release conditions.

[0090] Combined with attachment Figure 1 , the following is a description of the media paths in the six operating modes after the connection structure is improved to ensure the accuracy of the component sequence and flow direction:

[0091] Mode 1: Only the main unit provides cooling

[0092] -Open component:

[0093] -Valve: Electric proportional valve V1

[0094] -Water pump: refrigeration pump

[0095] -Run path:

[0096] 1. Coolant path:

[0097] Air conditioning host 1 → L1 (electric proportional valve V1 is open → refrigeration pump) → air conditioning terminal group → L2 → return to air conditioning host 1.

[0098] 2. Coolant path:

[0099] The cold storage tank circuit is closed and there is no flow.

[0100] Mode 2: Host cools down at night

[0101] -Open component:

[0102] -Valve: Electric valve V3, electric proportional valve V6

[0103] -Water pump: first cold storage pump, second cold storage pump

[0104] -Run path:

[0105] 1. Coolant path:

[0106] Air conditioning main unit (1) → L1 → L3 (electric valve V3 is opened → first cold storage pump) → first heat exchange pipeline of heat exchanger 4 → L4 → L2 → return to air conditioning main unit 1.

[0107] 2. Coolant path:

[0108] Cold storage tank body 100 → first coolant pipeline L6 → second heat exchange pipeline of heat exchanger 4 → third coolant pipeline L8 (electric proportional valve V6 is open → second cold storage pump) → return to cold storage tank body 100.

[0109] Mode 3: Cooling by cold storage pool only

[0110] -Open component:

[0111] -Valve: Electric proportional valve V2, electric proportional valve V5

[0112] -Water pump: refrigeration pump, cooling pump

[0113] -Run path:

[0114] 1. Coolant path:

[0115] The first heat exchange pipeline of the heat exchanger 4 → L3 → L5 (electric proportional valve V2 is open) → L1 → refrigeration pump → air conditioning terminal group → L2 → L4 → returns to the heat exchanger 4.

[0116] 2. Coolant path:

[0117] Cold storage tank body 100 → second coolant pipeline L7 (cold release pump → electric proportional valve V5 open) → second heat exchange pipeline of heat exchanger 4 → first coolant pipeline L6 → return to cold storage tank body 100.

[0118] Mode 4: The host and the cold storage pool provide cooling at the same time

[0119] -Open component:

[0120] -Valves: Electric proportional valve V1, electric proportional valve V2, electric proportional valve V5

[0121] -Water pump: refrigeration pump, cooling pump

[0122] -Run path:

[0123] 1. Coolant path:

[0124] -Host branch: air conditioning host 1 → L1 (electric proportional valve V1 is open → refrigeration pump) → air conditioning terminal group → L2 → return to air conditioning host 1.

[0125] -Cold storage tank branch: heat exchanger 4→L3→L5 (electric proportional valve V2 is open)→L1→refrigeration pump→air conditioning terminal unit→L2→L4→return to heat exchanger 4.

[0126] 2. Coolant path:

[0127] Cold storage tank body 100 → second coolant pipeline L7 (cold release pump → electric proportional valve V5 open) → second heat exchange pipeline of heat exchanger 4 → first coolant pipeline L6 → return to cold storage tank body 100.

[0128] Mode 5: The main unit provides cooling while storing cold

[0129] -Open component:

[0130] -Valves: Electric valve V1, electric valve V3, electric proportional valve V6

[0131] -Water pump: refrigeration pump, first cold storage pump, second cold storage pump

[0132] -Run path:

[0133] 1. Coolant path:

[0134] -Cooling branch: air conditioning main unit 1 → L1 (electric proportional valve V1 opens L1 → refrigeration pump) → air conditioning terminal group → L2 → return to air conditioning main unit 1.

[0135] -Cold storage branch: air conditioner main unit 1 → L1 → L3 (electric proportional valve V3 is open → first cold storage pump) → first heat exchange pipeline of heat exchanger 4 → L4 → L2 → return to air conditioner main unit 1.

[0136] 2. Coolant path:

[0137] Cold storage tank body 100 → first coolant pipeline L6 → second heat exchange pipeline of heat exchanger 4 → third coolant pipeline L8 (V6 is open → second cold storage pump) → return to cold storage tank body 100.

[0138] Mode 6: Natural cooling mode (for evaporative cooling units only)

[0139] Applicable scenarios: When the external ambient temperature is low (such as in winter or transitional seasons) and the indoor cooling is still required, the natural cooling function of the evaporative cooling unit is used to lower the coolant temperature by exchanging heat with the low-temperature ambient air. This eliminates the need to start the compressor and significantly reduces energy consumption.

[0140] -The running path is basically the same as mode 1:

[0141] 1. Coolant path:

[0142] Air conditioning host 1 → L1 (electric proportional valve V1 is open → refrigeration pump) → air conditioning terminal group → L2 → return to air conditioning host 1.

[0143] -Note: The compressor in the evaporative cooling unit is shut down, and the fan is used to introduce natural wind to cool the refrigerant flowing through the unit to ensure the terminal cooling demand.

[0144] 2. Coolant path:

[0145] The cold storage tank circuit is closed and there is no flow.

[0146] Final effect: By adding a new natural cooling mode, the system achieves "zero compressor cooling" in low-temperature environments, further reducing operating costs. It is suitable for scenarios with high cooling demands, such as data centers and constant temperature factories.

[0147] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0148] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An air conditioning system with a sunken cold storage device, comprising an air conditioning system, a sunken cold storage device and a heat exchanger (4); a first heat exchange pipeline (41) in the heat exchanger (4) is connected to a refrigerant pipeline of the air conditioning system, and a second heat exchange pipeline (42) is connected to a coolant pipeline of the sunken cold storage device, so as to realize heat exchange between the coolant pipeline and the refrigerant pipeline; and the characteristics are: -The sunken cold storage device comprises a cold storage tank body (100) for storing cold energy by storing cooling liquid; -The cold storage unit includes a coolant pipeline, and a water pump and a valve arranged on the coolant pipeline; - The coolant pipeline and the heat exchanger (4), water pump and valve connected thereto are all located below the lowest working water level of the cold storage tank body (100).

2. The air conditioning system with a sunken cold storage device according to claim 1, characterized in that: - the cooling liquid pipeline comprises a first cooling liquid pipeline (L6) and a second cooling liquid pipeline (L7), which are respectively connected to the two end interfaces of the cold storage tank body (100) and the second heat exchange pipeline (42) of the heat exchanger (4); - A third coolant pipeline (L8) is connected in parallel to the second coolant pipeline (L7), and a coolant release pump (34) and a second coolant storage pump (35) are respectively provided on the second coolant pipeline (L7) and the third coolant pipeline (L8).

3. The air conditioning system with a sunken cold storage device according to claim 1, characterized in that: -The air conditioning system comprises an air conditioning main unit (1) and an air conditioning terminal group composed of a plurality of air conditioning terminals (5) connected in parallel; - The air conditioner main unit (1) is connected to the air conditioner terminal group through a first refrigerant pipeline (L1) and a second refrigerant pipeline (L2) to form a loop, wherein the first refrigerant pipeline (L1) is provided with an electric proportional valve V1 and a refrigeration pump (13) in sequence; a sixth refrigerant pipeline (L9) is connected between the first refrigerant pipeline (L1) and the second refrigerant pipeline (L2); one end of the sixth refrigerant pipeline (L9) is connected between the electric proportional valve (V1) and the refrigeration pump 13 of the first refrigerant pipeline (L1), and the other end is connected to the second refrigerant pipeline (L2); an electric proportional valve (V4) is provided on the sixth refrigerant pipeline (L9); -The heat exchanger (4) is connected to the air conditioner main unit (1) via a third refrigerant pipe (L3) and a fourth refrigerant pipe (L4), wherein: - The third secondary refrigerant pipeline (L3) is connected to the first secondary refrigerant pipeline (L1) between the air conditioner main unit (1) and the electric proportional valve (V1), and the first cold storage pump (3) and the electric valve V3 are sequentially arranged on the third secondary refrigerant pipeline (L3); - the fourth secondary refrigerant pipeline (L4) is connected to the second secondary refrigerant pipeline (L2); The third refrigerant pipeline (L3) is connected to the first refrigerant pipeline (L1) via the fifth refrigerant pipeline (L5); one end of the fifth refrigerant pipeline (L5) is connected to the first refrigerant pipeline (L1) between the electric proportional valve V1 and the freezing pump (13); the other end is connected to the third refrigerant pipeline (L3) between the first cold storage pump (3) and the heat exchanger (4); and the fifth refrigerant pipeline (L5) is provided with an electric proportional valve V2.

4. The air conditioning system with a sunken cold storage device according to claim 2, characterized in that: - The second coolant pipeline (L7) and the third coolant pipeline (L8) are also provided with an electric proportional valve V5 and an electric proportional valve V6 respectively.

5. The air conditioning system with a sunken cold storage device according to claim 1, characterized in that: - The cold storage tank body (100) is divided into at least two rows of cold storage chambers arranged in parallel by a partition wall structure; - Each row of cold storage chambers comprises a liquid inlet and outlet terminal chamber (201) and a circulation terminal chamber (202) located at both ends, and a cold energy storage chamber (203) and a fluid acceleration chamber (204) alternately arranged between the liquid inlet and outlet terminal chamber (201) and the circulation terminal chamber (202); - the circulation terminal cavities (202) of two adjacent rows of cold storage chambers are connected, and the chamber width of the cold storage energy storage chamber (203) is greater than the chamber widths of the fluid acceleration chamber (204), the liquid inlet and outlet terminal chamber (201), and the circulation terminal chamber (202); - a first two-way pipe (101) and a second two-way pipe (102), respectively connected to the same side or both sides of the cold storage tank body (100), and communicating with the liquid inlet and outlet terminal cavities (201) of the two rows of cold storage chambers; - Interlaced and circuitous flow channels are formed between the liquid inlet and outlet terminal cavity (201), the cold energy storage cavity (203), the fluid acceleration cavity (204) and the circulation terminal cavity (202).

6. The air conditioning system with a sunken cold storage device according to claim 5, characterized in that: -The partition wall structure comprises: - a transverse partition (300) for separating at least two rows of cold storage chambers in the cold storage tank body (100); a flow opening (301) is provided on the transverse partition (300) for communicating the flow terminal cavities (202) of two adjacent rows of cold storage chambers; - an upper baffle (302), the upper end of which abuts against the top of the cold storage tank body (100), and a first flow port (303) is formed between the lower end and the bottom; - a lower baffle (304), the lower end of which abuts against the bottom of the cold storage tank body (100), and a second flow port (305) is formed between the upper end and the top; - the end of the cold storage tank body (100) is separated from the liquid inlet and outlet terminal cavity (201) by the upper partition (302); The upper partition (302) and the lower partition (304) are staggered to form the circuitous flow channel and the liquid inlet and outlet terminal cavity (201), the cold energy storage cavity (203), the fluid acceleration cavity (204) and the circulation terminal cavity (202).

7. The air conditioning system with a sunken cold storage device according to claim 5, characterized in that: - a first liquid distribution pipe (401) is provided at the inner end of the first two-way pipe (101), and a second liquid distribution pipe (402) is provided at the inner end of the second two-way pipe (102); - the first liquid distribution pipe (401) and the second liquid distribution pipe (402) are arranged along the length direction of the liquid inlet and outlet terminal cavity (201); The first liquid distribution pipe (401) has a plurality of first liquid distribution ports (403) distributed along its length, and the second liquid distribution pipe (402) has a plurality of second liquid distribution ports (404) distributed along its length; - The liquid outlet directions of the first liquid distribution port (403) and the second liquid distribution port (404) are opposite to the first flow port (303) between the upper partition plate (302) and the inner wall of the cold storage tank body (100).

8. The air conditioning system with a sunken cold storage device according to claim 6, characterized in that: A stairwell (500) is provided on one side of the cold storage tank body (100), and an inspection door (501) is provided on each of the upper partition (302), the lower partition (304) and the transverse partition (300), or an inspection port is provided at the upper end of the cold storage tank body (100) corresponding to each cold storage energy storage cavity (203).

9. The air conditioning system with a sunken cold storage device according to claim 7, characterized in that: - The first liquid distribution pipe (401) and the second liquid distribution pipe (402) are arranged at positions that meet the following requirements: a) a height higher than the first flow opening (303) at the lower end of the upper partition (302); b) is lower than the lowest designed water level of the cold storage tank body (100), and the lowest designed water level is higher than the height of the upper end of the lower baffle (304).

10. The air conditioning system with a sunken cold storage device according to claim 5, characterized in that: - a middle section of the cold storage chamber is separated by the partition wall structure in the cold storage tank body (100); - the cold storage chamber of the middle section comprises a circulation terminal chamber (202) located at both ends, and a cold energy storage chamber (203) and a fluid acceleration chamber (204) alternately arranged between the circulation terminal chambers (202); - The flow terminal cavities (202) on both sides of the cold storage chamber of the middle section are connected to the flow terminal cavities (202) of the adjacent cold storage chambers.

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