Frequency conversion refrigerating system, air conditioning equipment and control method

Abstract

The invention relates to a variable-frequency refrigerating system, air conditioning equipment and a control method. The variable-frequency refrigerating system comprises a cold supply tail end, a pipeline assembly, a plurality of variable-frequency refrigerating modules arranged in parallel and a plurality of variable-frequency water pumps arranged in parallel, and the variable-frequency refrigerating modules and the variable-frequency water pumps are connected with the cold supply tail end through the pipeline assembly; the frequency conversion refrigeration module comprises a compressor, a fan assembly and a heat exchanger assembly. The variable-frequency refrigeration module and the variable-frequency water pump of the variable-frequency refrigeration system can achieve variable-frequency control, the water pump and the refrigeration module can be matched in operation state under different working conditions, the operation range of the variable-frequency refrigeration system and the air conditioning equipment is expanded through the dual-variable-frequency design, and the system efficiency can be improved. Due to the fact that the variable-frequency refrigerating modules connected in parallel and the variable-frequency water pumps connected in parallel are arranged in the variable-frequency refrigerating system, redundant design of the refrigerating modules and the water pumps can be achieved, failure of the system due to damage of part of components is avoided, and the reliability and stability of the variable-frequency refrigerating system are improved.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and in particular to a variable frequency refrigeration system, air conditioning equipment and control method. Background Technology

[0002] In traditional refrigeration systems, especially in applications with high reliability requirements such as industrial cooling and central air conditioning, water pumps and refrigeration modules commonly operate at fixed frequencies. These systems are typically selected based on maximum load and highest ambient temperature during design. Therefore, in actual operation, the refrigeration system often operates under partial load, unable to flexibly adjust output according to real-time conditions. Fixed-frequency water pumps can only control water flow by starting and stopping or adjusting valves, resulting in slow response times and potential for hydraulic shock, pressure fluctuations, and energy waste. Similarly, fixed-frequency refrigeration modules can only adjust cooling capacity by turning them on and off. Frequent starting and stopping of the refrigeration module not only shortens the compressor's lifespan but also causes temperature fluctuations, affecting the stability of the cooled equipment.

[0003] Although some existing refrigeration systems are equipped with variable frequency water pumps, the refrigeration modules are still fixed frequency. This can easily lead to situations where the water pump runs at low speed but the compressor is still running at full load, or the water pump runs at high speed but the compressor is not cooling enough. This can easily lead to a decrease in system efficiency, increased equipment wear, and in severe cases, damage to the variable frequency water pump and / or compressor, resulting in system failure. Summary of the Invention

[0004] This application provides a variable frequency refrigeration system, air conditioning equipment, and control method to solve the technical problem that existing refrigeration systems are prone to system efficiency decline and system failure due to mismatch between the operating states of the water pump and the refrigeration module.

[0005] In a first aspect, this application provides a variable frequency refrigeration system, comprising: Multiple variable frequency refrigeration modules are connected in parallel. Each variable frequency refrigeration module includes a compressor, a fan assembly, and a heat exchanger assembly. Multiple variable frequency water pumps are connected in parallel. Cooling terminal; Piping components, multiple variable frequency refrigeration modules, and multiple variable frequency water pumps are connected to the cooling terminal through the piping components.

[0006] Optionally, the heat exchanger assembly includes a first heat exchanger, which is correspondingly disposed with the fan assembly. The fan assembly drives the airflow to exchange heat with the first heat exchanger, and the first heat exchanger has a first coolant pipeline connected to the pipeline assembly.

[0007] Optionally, the heat exchanger assembly further includes a second heat exchanger and a third heat exchanger. The compressor is connected to the second heat exchanger and the third heat exchanger respectively through a refrigerant circulation pipeline. The second heat exchanger is an evaporator and has a refrigerant pipeline and a second coolant pipeline for heat exchange. The second coolant pipeline is connected to the pipeline assembly.

[0008] Optionally, the number of variable frequency water pumps is three or more, and multiple variable frequency water pumps are integrated into one unit.

[0009] Optionally, the variable frequency refrigeration system also includes a coolant storage tank, which is connected to the piping assembly.

[0010] Optionally, the variable frequency refrigeration system also includes a control unit, which is connected to multiple variable frequency refrigeration modules and multiple variable frequency water pumps respectively.

[0011] Optionally, the variable frequency refrigeration system also includes a detection unit, which is signal-connected to the control unit. The detection unit includes multiple detection elements, including temperature detection elements, flow detection elements, and pressure detection elements.

[0012] Secondly, this application provides an air conditioning device, including the variable frequency refrigeration system provided in the first aspect of this application, and also includes a device frame, the device frame including a pipe installation area, the device frame being symmetrically arranged with the pipe installation area as the center; the pipe assembly is disposed in the pipe installation area, and multiple variable frequency refrigeration modules and multiple variable frequency water pumps are installed in the device frame and distributed on both sides of the pipe assembly.

[0013] Thirdly, this application provides a control method that uses the variable frequency refrigeration system provided in the first aspect of this application, including the following steps: Monitor ambient temperature T and cooling capacity requirement Z; The number and frequency of multiple variable frequency refrigeration modules and multiple variable frequency water pumps are controlled according to the ambient temperature T and the cooling capacity requirement Z.

[0014] Optionally, when the cooling capacity demand Z > the first demand threshold Z1, the variable frequency cooling system is under heavy load. When the first demand threshold Z1 ≥ cooling capacity demand Z > the second demand threshold Z2, the variable frequency refrigeration system is in a medium load condition. When the second demand threshold Z2 ≥ cooling capacity demand Z > the third demand threshold Z3, the variable frequency refrigeration system is in a light load condition. When the cooling capacity demand Z ≤ the third demand threshold Z3, the variable frequency refrigeration system is in low frequency operation condition.

[0015] Optionally, when the variable frequency refrigeration system is under heavy load, if the ambient temperature T ≥ the first temperature threshold T1, all variable frequency refrigeration modules and all variable frequency water pumps are turned on, and the operating frequency Bf of the variable frequency water pumps ≥ the water pump intermediate frequency operating threshold Bf1; If the liquid supply temperature t at the cooling terminal is greater than the liquid supply set threshold t0, keep the operating frequency Bf of the variable frequency water pump unchanged, first increase the operating frequency Yf of the compressor and the operating frequency Ff of the fan assembly in the variable frequency refrigeration module to reduce the liquid supply temperature t until the liquid supply temperature t ≤ the liquid supply set threshold t0. When both the compressor's operating frequency Yf and the fan assembly's operating frequency Ff reach the upper limit threshold of the operating frequency, if the liquid supply temperature t is still greater than the liquid supply set threshold t0, the operating frequency Bf of the variable frequency water pump is increased until the liquid supply temperature t ≤ the liquid supply set threshold t0.

[0016] Optionally, when the variable frequency refrigeration system is under medium load, if the first temperature threshold T1 > ambient temperature T ≥ the second temperature threshold T2, all variable frequency refrigeration modules and all variable frequency water pumps are turned on, and the variable frequency water pumps operate at the rated frequency. If the liquid supply temperature t at the cooling terminal is less than the liquid supply set threshold t0, and t0-t > the supply and demand threshold t1, keep the operating frequency Bf of the variable frequency water pump unchanged, first reduce the operating frequency Yf of the compressor and the operating frequency Ff of the fan assembly in the variable frequency refrigeration module to increase the liquid supply temperature t until the liquid supply temperature t is less than the liquid supply set threshold t0, and t0-t ≤ the supply and demand threshold t1; When the operating frequency Yf of the compressor and the operating frequency Ff of the fan assembly both reach the lower limit threshold of the operating frequency, if the liquid supply temperature t < the liquid supply set threshold t0 and t0-t > the supply and demand threshold t1, then reduce the number of variable frequency refrigeration modules in operation until the liquid supply temperature t < the liquid supply set threshold t0 and t0-t ≤ the supply and demand threshold t1. When the number of variable frequency cooling modules in operation is reduced to at least the number threshold of cooling modules, if the liquid supply temperature t < the liquid supply set threshold t0 and t0-t > the supply and demand threshold t1, then the operating frequency of the variable frequency water pump is reduced until the liquid supply temperature t < the liquid supply set threshold t0 and t0-t ≤ the supply and demand threshold t1.

[0017] Optionally, when the variable frequency refrigeration system is under medium load, if the first temperature threshold T1 > ambient temperature T ≥ the second temperature threshold T2, all variable frequency refrigeration modules and all variable frequency water pumps are turned on, and the variable frequency water pumps operate at the rated frequency. If the liquid supply temperature t at the cooling terminal is greater than the liquid supply set threshold t0, keep the operating frequency Bf of the variable frequency water pump unchanged, first increase the operating frequency Yf of the compressor and the operating frequency Ff of the fan assembly in the variable frequency refrigeration module to reduce the liquid supply temperature t until the liquid supply temperature t ≤ the liquid supply set threshold t0. When both the compressor's operating frequency Yf and the fan assembly's operating frequency Ff reach the upper limit threshold of the operating frequency, if the liquid supply temperature t is still greater than the liquid supply set threshold t0, the operating frequency Bf of the variable frequency water pump is increased until the liquid supply temperature t ≤ the liquid supply set threshold t0.

[0018] Optionally, when the variable frequency refrigeration system is under medium or light load conditions, if the second temperature threshold T2 is greater than the ambient temperature T, all variable frequency water pumps are turned on and the variable frequency water pumps operate at the rated frequency. After running for a preset time, gradually reduce the number of variable frequency water pumps in operation until the number of variable frequency water pumps in operation is reduced to the water pump number threshold. If the liquid supply temperature t at the cooling terminal gradually increases and the liquid supply temperature t > the liquid supply set threshold t0, the variable frequency cooling module and variable frequency water pump will be turned on one by one until the liquid supply temperature t ≤ the liquid supply set threshold t0.

[0019] Optionally, when turning on the variable frequency refrigeration module and the variable frequency water pump one by one, if the operating frequency Yf of the compressor and the operating frequency Ff of the fan assembly in the previous variable frequency refrigeration module both reach the rated frequency, then the number of variable frequency water pumps in operation is increased; if all variable frequency water pumps are already in operation, then the number of variable frequency refrigeration modules in operation is increased.

[0020] Optionally, when the variable frequency refrigeration system is in low-frequency operation, all variable frequency refrigeration modules and all variable frequency water pumps are turned on. The operating frequency Yf of the compressor in the variable frequency refrigeration module is less than or equal to the compressor low-frequency threshold Yf1, the operating frequency Ff of the fan assembly is less than or equal to the fan low-frequency threshold Ff1, and the operating frequency Bf of the variable frequency water pump is less than or equal to the water pump low-frequency threshold Bf2.

[0021] The technical solutions provided in this application have the following advantages compared with the prior art: The variable frequency refrigeration system provided in this application includes multiple variable frequency refrigeration modules and multiple variable frequency water pumps connected in parallel. Both the variable frequency refrigeration modules and the variable frequency water pumps can achieve variable frequency control, which can match the operating status of the water pumps and refrigeration modules under different operating conditions and improve the efficiency of the variable frequency refrigeration system. The operating range of the variable frequency refrigeration system and air conditioning equipment can be expanded through the dual variable frequency design of the variable frequency refrigeration modules and variable frequency water pumps.

[0022] In addition, since the variable frequency refrigeration system of this application is equipped with multiple parallel variable frequency refrigeration modules and multiple parallel variable frequency water pumps, the redundancy design of the refrigeration modules and water pumps can be realized. When some variable frequency refrigeration modules and / or some variable frequency water pumps are damaged, the variable frequency refrigeration system can still continue to operate through other undamaged variable frequency refrigeration modules and variable frequency water pumps, which can avoid system failure and improve the reliability and stability of the variable frequency refrigeration system.

[0023] The air conditioning equipment and control method provided in this application include or employ the above-mentioned variable frequency refrigeration system, which can achieve matching of the operating states of the water pump and the refrigeration module under different operating conditions. Therefore, it naturally possesses the technical effects of the above-mentioned variable frequency refrigeration system. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0027] Figure 1 This is a schematic diagram of the structure of an air conditioning device provided in an embodiment of this application; Figure 2 This is a connection diagram of the variable frequency refrigeration system provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the variable frequency cooling module provided in the embodiments of this application; Figure 4 This is a schematic diagram of the internal structure of the variable frequency cooling module provided in the embodiments of this application; Figure 5 This is a schematic diagram showing the connection between the variable frequency cooling module and the piping assembly provided in an embodiment of this application; Figure 6 A schematic diagram of the first cooling mode of the variable frequency cooling module provided in the embodiments of this application; Figure 7 A schematic diagram of the second cooling mode of the variable frequency cooling module provided in the embodiments of this application; Figure 8 This is a schematic diagram showing the connection of multiple variable frequency water pumps and pipeline components provided in the embodiments of this application; Figure 9 A flowchart of the control method provided in the embodiments of this application.

[0028] Explanation of reference numerals in the attached figures: 1. Variable frequency refrigeration module; 1a. First variable frequency refrigeration module; 1b. Second variable frequency refrigeration module; 1c. Third variable frequency refrigeration module; 1d. Fourth variable frequency refrigeration module; 1e. Fifth variable frequency refrigeration module; 1f. Sixth variable frequency refrigeration module; 1g. Seventh variable frequency refrigeration module; 11. Compressor; 12. Fan assembly; 13. First heat exchanger; 131. First coolant pipeline; 14. Second heat exchanger; 141. Refrigerant pipeline; 142. Second coolant pipeline; 15. Third heat exchanger; 16. Module housing; 17. Throttling device; 2. Variable frequency water pump; 2a. First variable frequency water pump; 2b. Second variable frequency water pump; 2c. Third variable frequency water pump; 3. Cooling terminal; 4. Piping components; 5. Coolant storage tank; 6. Control unit; 7. Equipment frame; 71. Pipeline installation area. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0031] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0032] To address the technical problem in existing refrigeration systems that are prone to efficiency degradation and system failure due to mismatch between the operating states of the water pump and the refrigeration module, this application provides a variable frequency refrigeration system, air conditioning equipment, and control method. The variable frequency refrigeration system includes multiple variable frequency refrigeration modules 1 connected in parallel and multiple variable frequency water pumps 2 connected in parallel. Both the variable frequency refrigeration modules 1 and the variable frequency water pumps 2 can be controlled by variable frequency, enabling matching of the operating states of the water pumps and refrigeration modules under different operating conditions, thereby improving the efficiency of the variable frequency refrigeration system. Furthermore, the multiple quantities of variable frequency refrigeration modules 1 and variable frequency water pumps 2 allow for redundant design, thus preventing system failure due to damage to a single variable frequency refrigeration module 1 or a single variable frequency water pump 2.

[0033] Please see Figures 1 to 9The first aspect of this application provides a variable frequency cooling system, including multiple variable frequency cooling modules 1, multiple variable frequency water pumps 2, a cooling terminal 3, and a piping assembly 4. The multiple variable frequency cooling modules 1 are all frequency-controlled, and the cooling capacity of each module 1 can be independently adjusted. The multiple modules 1 can cooperate to meet the cooling requirements of the variable frequency cooling system. The multiple variable frequency water pumps 2 can also be frequency-adjusted to adapt to the coolant flow requirements under different operating conditions. Each pump 2 supports independent start / stop control and speed adjustment to facilitate dynamic adjustment. The cooling terminal 3 can transfer the cooling capacity generated by the variable frequency cooling system to the target area through a medium such as coolant, achieving cooling of the target area. The multiple variable frequency cooling modules 1 and multiple variable frequency water pumps 2 are connected to the cooling terminal 3 through the piping assembly 4. The variable frequency water pumps 2 drive the coolant in the piping assembly 4 to circulate, and the coolant is cooled by the variable frequency cooling modules 1. Finally, the cooling capacity generated by the variable frequency cooling modules 1 is transferred to the cooling terminal 3 through the coolant.

[0034] For details, please refer to Figure 1 and Figure 2 Multiple variable frequency cooling modules 1 are connected in parallel, allowing the coolant in the piping assembly 4 to flow into any one or more of the variable frequency cooling modules 1 for heat exchange, and then transfer the cooling capacity generated by the variable frequency cooling modules 1 to the cooling terminal 3. The number of operating variable frequency cooling modules 1 can be controlled according to the cooling capacity demand of the cooling terminal 3, and the operating frequency of the variable frequency cooling modules 1 can be dynamically adjusted. For example, when the ambient temperature is high or the load is heavy, multiple or all variable frequency cooling modules 1 can be controlled to operate at high frequency to increase the cooling capacity output; when the ambient temperature is low or the load is low, the number of operating variable frequency cooling modules 1 can be reduced, the operating frequency of the variable frequency cooling modules 1 can be lowered, the cooling capacity output can be reduced, and the system energy consumption can be reduced.

[0035] The variable frequency refrigeration module 1 includes a compressor 11, a fan assembly 12, and a heat exchanger assembly, such as... Figure 3 , Figure 4 and Figure 5 As shown, the compressor refrigeration mode can be achieved by the cooperation of the compressor 11, the fan assembly 12, and the heat exchanger assembly, or the natural cooling mode (i.e., air-cooled cooling mode) can be achieved by the cooperation of the fan assembly 12 and the heat exchanger assembly. This allows the variable frequency cooling module 1 to have multiple cooling modes, enabling it to operate in different modes according to different operating conditions, thereby improving cooling efficiency while reducing the energy consumption of the variable frequency cooling module 1. For example, when the cooling capacity demand of the cooling terminal 3 is small, cooling can be achieved solely through natural cooling, eliminating the need to operate the compressor 11. This allows the cooling capacity demand of the cooling terminal 3 to be met while reducing the energy consumption of the variable frequency cooling module 1.

[0036] Multiple variable frequency water pumps 2 are connected in parallel, and the coolant in the pipeline assembly 4 can be driven by any one or more variable frequency water pumps 2, so that the coolant flows in the pipeline assembly 4, thereby transferring the cooling capacity generated by the variable frequency refrigeration module 1 to the cooling terminal 3.

[0037] Since each variable frequency water pump 2 can be controlled by a variable frequency, the operating frequency of the variable frequency water pump 2 can be adjusted under different operating conditions, thereby adjusting the flow rate and velocity of the coolant in the pipeline assembly 4. By superimposing the flow rates of multiple variable frequency water pumps 2, the ultra-large flow rate requirements of the cooling terminal 3 (such as large commercial complexes, data center cooling systems, etc.) can be easily met. This is beneficial to expanding the flow rate adjustment range of the variable frequency refrigeration system. Under low load conditions (such as winter), only one or two variable frequency water pumps 2 can be operated, and extremely low flow rate output can be achieved through variable frequency adjustment, avoiding energy waste.

[0038] It should be noted that this application uses multiple variable frequency cooling modules 1 and multiple variable frequency water pumps 2 in cooperation. When the load is high, the operating frequency of the variable frequency cooling modules 1 and variable frequency water pumps 2 can be increased, and when the load is low, the operating frequency of the variable frequency cooling modules 1 and variable frequency water pumps 2 can be reduced. This can achieve matching of the operating states between the cooling modules and water pumps, and avoid system efficiency reduction and system failure due to mismatch between the operating states of the water pumps and cooling modules.

[0039] In addition, since the variable frequency refrigeration system of this application has multiple parallel variable frequency refrigeration modules 1 and multiple parallel variable frequency water pumps 2, it can achieve a redundant design of refrigeration modules and water pumps. When some variable frequency refrigeration modules 1 and / or some variable frequency water pumps 2 are damaged, the variable frequency refrigeration system can still continue to operate through other undamaged variable frequency refrigeration modules 1 and variable frequency water pumps 2, which can avoid system failure and improve the reliability and stability of the variable frequency refrigeration system. For example, when there are more than three variable frequency water pumps 2, if one or two variable frequency water pumps 2 suddenly fail and cannot operate normally, the operating frequency of the normally operating variable frequency water pumps 2 can be increased by the control unit 6 to ensure the normal liquid supply flow of the variable frequency refrigeration system and ensure the stability of the coolant flow. At the same time, the faulty water pump can be repaired online without stopping the system and without affecting the normal operation of the variable frequency refrigeration system. It can truly realize online fault repair, demonstrating the high reliability and high stability of the variable frequency refrigeration system of this application.

[0040] In some embodiments of this application, please refer to Figure 4 , Figure 5 and Figure 6The heat exchanger assembly includes a first heat exchanger 13, which is correspondingly arranged with a fan assembly 12. The fan assembly 12 drives airflow to exchange heat with the first heat exchanger 13, enabling air cooling of the first heat exchanger 13. The first heat exchanger 13 has a first coolant pipe 131 connected to the pipe assembly 4, allowing the coolant in the first coolant pipe 131 to be naturally cooled by air cooling. Figure 6 As shown ( Figure 6 Solid lines represent connected pipes, dashed lines represent disconnected pipes, solid arrows indicate the direction of coolant flow, and dashed arrows indicate the direction of airflow.

[0041] It should be noted that when the cooling demand of the cooling terminal 3 is small, only the fan assembly 12 can be operated to cool the coolant flowing in the first heat exchanger 13. This is the first cooling mode of the variable frequency cooling module 1. Since the compressor 11 is not turned on in this cooling mode, the energy consumption generated by the variable frequency cooling module 1 during the cooling process is also low, which is conducive to achieving energy-saving operation of the variable frequency cooling system and reducing system energy consumption and operating costs.

[0042] In some embodiments of this application, please refer to Figure 4 , Figure 5 and Figure 7 The heat exchanger assembly also includes a second heat exchanger 14 and a third heat exchanger 15. The compressor 11 is connected to the second heat exchanger 14 and the third heat exchanger 15 respectively through a refrigerant circulation pipeline to realize refrigerant circulation and heat exchange, thereby realizing the compressor refrigeration mode. This is the second refrigeration mode of the variable frequency refrigeration module 1.

[0043] Specifically, the second heat exchanger 14 is an evaporator, and it has a refrigerant pipe 141 and a second coolant pipe 142 for heat exchange. The second coolant pipe 142 is connected to the pipe assembly 4. The refrigerant in the refrigerant pipe 141 exchanges heat with the coolant. After absorbing heat from the coolant, the refrigerant evaporates into a gaseous state, thus cooling the coolant. The coolant flows out of the second coolant pipe 142 and then transfers the cooling capacity to the cooling terminal 3 through the pipe assembly 4. Figure 7 As shown ( Figure 7 Solid lines represent connected pipelines, dashed lines represent disconnected pipelines, and solid arrows indicate the direction of medium flow inside the pipelines.

[0044] It should be noted that in compressor refrigeration mode, the variable frequency refrigeration module 1 has a stronger refrigeration capacity. The third heat exchanger 15 is a condenser. Through the operation of the fan assembly 12, the heat inside the module housing 16 of the variable frequency refrigeration module 1 can be dissipated to the outside, and the refrigerant in the third heat exchanger 15 can be condensed into liquid. The variable frequency refrigeration module 1 is also equipped with a throttling device 17, which is used to throttle and reduce the pressure of the liquid refrigerant entering the second heat exchanger 14, thereby ensuring the continuous operation of the refrigerant circulation.

[0045] In the above embodiments, the operating frequency of the variable frequency cooling module 1 includes the operating frequency of the compressor 11 and the operating frequency of the fan assembly 12. The variable frequency compressor 11 can dynamically adjust its operating frequency to regulate the motor speed, ensuring that the cooling capacity is precisely matched to the actual demand and avoiding ineffective operation. The variable frequency fan can steplessly adjust its speed and airflow by adjusting its operating frequency, ensuring that the power of the fan assembly 12 is matched to the actual demand. Through the coordinated operation of the variable frequency compressor 11 and the variable frequency fan, the airflow and cooling capacity can be dynamically adjusted according to load changes, ensuring that the system is always in the optimal operating state.

[0046] In some embodiments of this application, please refer to Figure 1 and Figure 8 The number of variable frequency water pumps 2 is three or more. When one or two variable frequency water pumps 2 fail, the other variable frequency water pumps 2 can maintain the normal operation of the variable frequency refrigeration system. The reliability of the variable frequency refrigeration system is improved by the multi-pump redundancy operation mode.

[0047] Multiple variable frequency water pumps 2 are integrated to form a whole hydraulic module, which facilitates the convenient and centralized installation of multiple variable frequency water pumps 2 in the variable frequency refrigeration system.

[0048] It should be noted that the number of integrated variable frequency water pumps 2 can be increased according to different cooling capacity requirements of the water module, and the number of variable frequency cooling modules 1 can also be set appropriately according to the cooling capacity requirements of the cooling terminal 3, which can improve the modularity of the variable frequency cooling system and shorten the design cycle.

[0049] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 8The variable frequency refrigeration system includes seven variable frequency refrigeration modules 1 connected in parallel, designated as the first variable frequency refrigeration module 1a, the second variable frequency refrigeration module 1b, the third variable frequency refrigeration module 1c, the fourth variable frequency refrigeration module 1d, the fifth variable frequency refrigeration module 1e, the sixth variable frequency refrigeration module 1f, and the seventh variable frequency refrigeration module 1g. The cooling capacity adjustment range of each variable frequency refrigeration module 1 is 20% to 100%, and flexible adjustment of the cooling capacity can be achieved through the coordinated operation of the seven variable frequency refrigeration modules 1. The hydraulic module includes three variable frequency water pumps 2 connected in parallel, designated as the first variable frequency water pump 2a, the second variable frequency water pump 2b, and the third variable frequency water pump 2c. This allows for flexible adjustment of the coolant flow rate in the variable frequency refrigeration system, which is beneficial for achieving wide-range, high-reliability, and low-energy-consumption continuous operation of the variable frequency refrigeration system.

[0050] In the above embodiments, if the variable frequency refrigeration system needs to replenish or maintain the pressure of the coolant, it can be done in the main water inlet pipe of the pipeline assembly 4 without interfering with the operation of the variable frequency water pump 2. This can maintain the normal operation of the variable frequency water pump 2 and the hydraulic module, and greatly improve the stability and reliability of the variable frequency refrigeration system.

[0051] In some embodiments of this application, please refer to Figure 1 and Figure 2 The variable frequency refrigeration system also includes a coolant storage tank 5, which is connected to the piping assembly 4. This allows for the storage and replenishment of coolant without the need for frequent replenishment through the main inlet pipe of the piping assembly 4. When the cooling demand of the cooling terminal 3 suddenly increases, the variable frequency water pump 2 can increase its operating frequency, thereby increasing the coolant flow rate in the piping assembly 4. The coolant can then be replenished promptly through the coolant storage tank 5 to meet the cooling flow rate requirements of the cooling terminal 3, maintain the stability of the cooling supply, and prevent a sudden drop in the pipe pressure of the piping assembly 4 due to insufficient flow. This also prevents the cooling terminal 3 from experiencing performance degradation due to coolant shortage.

[0052] When the cooling demand of the cooling terminal 3 decreases, the variable frequency water pump 2 can reduce its operating frequency and reduce the flow rate of coolant in the piping assembly 4. Excess coolant can be returned to the coolant storage tank 5 through the piping assembly 4 for storage, thus preventing coolant from stagnating in the piping assembly 4 and causing pressure to rise, and preventing the piping assembly 4 from bursting or the valve from being damaged.

[0053] It should be noted that the coolant storage tank 5 can also serve as a buffer container to maintain pressure stability in the piping assembly 4, thereby protecting the piping assembly 4. The buffering effect of the coolant storage tank 5 can absorb pressure shocks caused by sudden changes in flow (such as the water hammer effect when the variable frequency water pump 2 starts and stops), preventing the piping assembly 4 from vibrating, loosening of joints, or cracking.

[0054] In the above embodiments, the coolant can be a medium such as water or ethylene glycol. The coolant circulates within the variable frequency refrigeration system, achieving efficient heat exchange with the variable frequency refrigeration module 1 and the cooling terminal 3, thereby meeting the refrigeration requirements of the cooling terminal 3. In this application embodiment, ethylene glycol is preferably used as the coolant, as it has good antifreeze properties and thermal stability, making it suitable for transferring cooling capacity under different operating conditions.

[0055] In some embodiments of this application, please refer to Figure 1 The variable frequency refrigeration system also includes a control unit 6, which is connected to multiple variable frequency refrigeration modules 1 and multiple variable frequency water pumps 2 respectively. It can realize variable frequency control of variable frequency refrigeration modules 1 and variable frequency water pumps 2 according to the operating conditions, thereby realizing intelligent collaborative control of variable frequency refrigeration modules 1 and variable frequency water pumps 2, improving the response speed and control accuracy of the variable frequency refrigeration system, and improving the efficiency of the variable frequency refrigeration system.

[0056] Specifically, the control unit 6 can dynamically adjust the operating status of the variable frequency refrigeration module 1 and the variable frequency water pump 2 according to the operating parameters of the variable frequency refrigeration system, such as coolant flow rate, coolant inlet and outlet temperature, ambient temperature, load conditions, operating status of variable frequency water pump 2, and operating status of variable frequency refrigeration module 1, so as to achieve wide operating conditions.

[0057] In some embodiments of this application, the variable frequency refrigeration system further includes a detection unit for detecting the operating parameters of the variable frequency refrigeration system. The detection unit is signal-connected to the control unit 6 and includes multiple detection devices distributed throughout the variable frequency refrigeration system. These devices are used to monitor the operating status of the variable frequency refrigeration module 1, the variable frequency water pump 2, the piping assembly 4, and the cooling terminal 3. The multiple detection devices include temperature detection devices, flow detection devices, and pressure detection devices, which can be used to detect operating parameters related to the operating status of the variable frequency refrigeration system, such as the supply liquid temperature, ambient temperature, coolant flow rate, refrigerant flow rate, and piping pressure in the piping assembly 4.

[0058] It should be noted that the detection unit can monitor key parameters during the operation of the variable frequency refrigeration system and feed them back to the control unit 6. The control unit 6 can achieve intelligent variable frequency regulation of multiple variable frequency refrigeration modules 1 and multiple variable frequency water pumps 2 through closed-loop feedback regulation control (PID) algorithms and other methods. It can dynamically adjust the operating frequency of variable frequency refrigeration modules 1 and variable frequency water pumps 2 according to load demand, so as to achieve on-demand cooling and avoid energy waste.

[0059] Please see Figures 1 to 9The second aspect of this application provides an air conditioning device, including the variable frequency refrigeration system described in the above embodiments, and also includes a device frame 7. The device frame 7 includes a pipe installation area 71. The device frame 7 is symmetrically arranged with the pipe installation area 71 as the center, which can optimize the overall mass distribution of the air conditioning device, ensure uniform mass distribution of the air conditioning device, and help improve the installation stability of the air conditioning device.

[0060] Piping assembly 4 is located in piping installation area 71. Multiple variable frequency refrigeration modules 1 and multiple variable frequency water pumps 2 are installed in equipment frame 7 and distributed on both sides of piping assembly 4, facilitating connection between piping assembly 4 and the variable frequency refrigeration modules 1 and variable frequency water pumps 2 on both sides. Figure 1 As shown, the pipe length of pipe assembly 4 can be shortened, making the overall structure of the air conditioning equipment more compact and reducing the floor space occupied by the air conditioning equipment.

[0061] As a specific embodiment of this application, please refer to Figure 1 The variable frequency refrigeration system includes seven variable frequency refrigeration modules 1 and three variable frequency water pumps 2. Four variable frequency refrigeration modules 1 are provided on the left side of the piping assembly 4, and a hydraulic module formed by integrating three variable frequency water pumps 2 and three variable frequency refrigeration modules 1 are provided on the right side of the piping assembly 4. This can make the weight distribution on the left and right sides of the equipment frame 7 as even as possible. The piping assembly 4 is centrally located in the piping installation area 71 in the middle of the equipment frame 7, which can make the connecting pipes shorter and the air conditioning equipment structure more compact.

[0062] It should be noted that both the variable frequency refrigeration module 1 and the hydraulic module can adopt a modular design of the same size, so that the modules are symmetrically distributed and the pipelines are centralized; the air conditioning equipment can be flexibly designed and built according to the cooling capacity requirements, shortening the design cycle.

[0063] In some embodiments of this application, please refer to Figure 1 The coolant storage tank 5 is also located in the piping installation area 71, facilitating the connection between the piping assembly 4 and the coolant storage tank 5 while reducing the length of the connecting piping. The control unit 6 includes an electrical control box for protecting the electrical components. The electrical control box is located in the equipment frame 7, facilitating overall maintenance of the air conditioning equipment at the equipment frame 7.

[0064] Please see Figures 1 to 9 The third aspect of this application provides a control method that uses the variable frequency refrigeration system described in the above embodiments, including the following steps: Step 1: After the variable frequency refrigeration system is powered on, monitor the ambient temperature T and cooling capacity demand Z of the cooling terminal 3, and divide the load of the variable frequency refrigeration system according to the cooling capacity demand Z, such as... Figure 9 As shown.

[0065] Specifically, when the cooling demand Z > the first demand threshold Z1, the cooling demand of the cooling terminal 3 is relatively large, and the variable frequency cooling system is under heavy load. The control unit 6 can meet the cooling demand by increasing the number and / or frequency of the variable frequency cooling module 1 and / or the variable frequency water pump 2.

[0066] When the first demand threshold Z1 ≥ cooling capacity demand Z > the second demand threshold Z2, the cooling capacity demand of the cooling terminal 3 is moderate, the variable frequency refrigeration system is under medium load, and the control unit 6 can meet the cooling capacity demand by making the number and / or frequency of operation of the variable frequency refrigeration module 1 and / or the variable frequency water pump 2 moderate.

[0067] When the second demand threshold Z2 ≥ cooling capacity demand Z > the third demand threshold Z3, the cooling capacity demand of the cooling terminal 3 is relatively small, and the variable frequency refrigeration system is under light load. The control unit 6 can appropriately reduce the number of variable frequency refrigeration modules 1 and / or the frequency of variable frequency water pumps 2 to meet the cooling capacity demand.

[0068] When the cooling demand Z ≤ the third demand threshold Z3, the cooling demand of the cooling terminal 3 is extremely low. The variable frequency refrigeration system is in a low-frequency operation condition. The control unit 6 can make both the variable frequency refrigeration module 1 and the variable frequency water pump 2 operate at low frequency, thereby reducing operating energy consumption and noise while meeting the cooling demand.

[0069] Step 2: Control the number and frequency of multiple variable frequency refrigeration modules 1 and multiple variable frequency water pumps 2 according to the ambient temperature T and cooling capacity requirement Z, so as to provide cooling according to the actual working conditions and needs.

[0070] During the operation of the variable frequency refrigeration system, the coolant flow rate adjustment must satisfy the following formula: Q = C × M × Δt, where Q is the cooling capacity, C is the specific heat capacity of the coolant, M is the mass flow rate of the coolant, and Δt is the supply and return water temperature difference, i.e., the temperature difference between the supply temperature t and the return water temperature. When the ambient temperature is high or the load is heavy, the control unit 6 can control the three variable frequency water pumps 2 to start simultaneously and increase the operating frequency of the variable frequency water pumps 2, thereby increasing the coolant flow rate, improving heat exchange efficiency, and increasing the cooling capacity to meet the cooling demand. When the ambient temperature is low or the load is low, the operating frequency of the variable frequency water pumps 2 can be reduced to decrease the coolant flow rate and reduce the cooling capacity output, avoiding energy waste.

[0071] Specifically, when the variable frequency refrigeration system is under heavy load, if the ambient temperature T ≥ the first temperature threshold T1, the cooling capacity demand of the cooling terminal 3 is large, and the heat load of the cooling terminal 3 increases significantly. All variable frequency refrigeration modules 1 and all variable frequency water pumps 2 are turned on, and the operating frequency Bf of the variable frequency water pump 2 is ≥ the water pump medium frequency operating threshold Bf1, so that the variable frequency water pump 2 operates at medium and high frequencies, ensuring that there is sufficient coolant flow in the pipeline assembly 4, improving heat exchange efficiency, and accelerating the transfer of cold energy.

[0072] All variable frequency cooling modules 1 are turned on and their cooling capacity is adjusted according to the liquid supply temperature. At this time, cooling is preferably achieved through the cooling mode of compressor 11, which can ensure that the cooling capacity of variable frequency cooling modules 1 meets the cooling capacity requirements of cooling terminal 3.

[0073] If the liquid supply temperature t of the cooling terminal 3 is greater than the liquid supply set threshold t0, keep the operating frequency Bf of the variable frequency water pump 2 unchanged, first increase the operating frequency Yf of the compressor 11 and the operating frequency Ff of the fan assembly 12 in the variable frequency refrigeration module 1 to reduce the liquid supply temperature t until the liquid supply temperature t ≤ the liquid supply set threshold t0; prioritize increasing the operating frequency of the compressor 11 and the fan assembly 12 to enhance the cooling capacity, rather than directly adjusting the operating frequency of the variable frequency water pump 2. This can quickly respond to load changes, while avoiding pressure fluctuations in the variable frequency refrigeration system caused by frequent adjustment of the operating frequency of the variable frequency water pump 2, and reducing the impact of coolant flow changes on the cooling terminal 3.

[0074] When the operating frequency Yf of compressor 11 and the operating frequency Ff of fan assembly 12 both reach the upper limit threshold of operating frequency, if the liquid supply temperature t is still greater than the liquid supply set threshold t0, the operating frequency Bf of variable frequency water pump 2 is increased until the liquid supply temperature t ≤ the liquid supply set threshold t0. This avoids damage to compressor 11 and fan assembly 12. The operating frequency of variable frequency water pump 2 is only increased under extreme conditions, avoiding energy waste caused by long-term high-frequency operation. The dual frequency conversion design significantly widens the operating range of the variable frequency refrigeration system, meeting the cooling needs of the cooling terminal 3 under heavy load and high-temperature environments.

[0075] When the variable frequency refrigeration system is under medium load, if the first temperature threshold T1 > ambient temperature T ≥ the second temperature threshold T2, the cooling capacity demand of the cooling terminal 3 is moderate. Turning on all variable frequency refrigeration modules 1 and all variable frequency water pumps 2, and having the variable frequency water pumps 2 operate at the rated frequency (rated frequency less than the water pump medium frequency operating threshold Bf1), can ensure that the coolant flow rate meets the heat exchange demand of the cooling terminal 3, avoiding insufficient flow leading to a decrease in heat exchange efficiency or excessive flow leading to energy waste of the variable frequency water pumps 2.

[0076] All variable frequency cooling modules 1 are turned on and their cooling capacity is adjusted according to the liquid supply temperature. The compressor 11 can be selected to cool the coolant in either cooling mode or air-cooled mode according to the cooling capacity requirements.

[0077] If the liquid supply temperature t of the cooling terminal 3 is less than the liquid supply set threshold t0, and t0-t is greater than the supply-demand threshold t1, it indicates that the variable frequency refrigeration system is overcooling. Keep the operating frequency Bf of the variable frequency water pump 2 unchanged, first reduce the operating frequency Yf of the compressor 11 and the operating frequency Ff of the fan assembly 12 in the variable frequency refrigeration module 1 to raise the liquid supply temperature t until the liquid supply temperature t is less than the liquid supply set threshold t0, and t0-t is less than the supply-demand threshold t1. This satisfies the cooling capacity requirement of the cooling terminal 3 while avoiding overcooling and preventing waste of cooling capacity.

[0078] When the operating frequency Yf of compressor 11 and the operating frequency Ff of fan assembly 12 both reach the lower limit threshold of operating frequency, if the liquid supply temperature t < the liquid supply set threshold t0 and t0-t > the supply and demand threshold t1, it indicates that there is still overcooling. Then reduce the number of variable frequency cooling modules 1 in operation until the liquid supply temperature t < the liquid supply set threshold t0 and t0-t ≤ the supply and demand threshold t1. Overcooling and waste of cooling capacity can be further avoided by reducing the number of variable frequency cooling modules 1 in operation.

[0079] When the number of variable frequency cooling modules 1 in operation is reduced to at least half of the total number of cooling modules (e.g., half the total number), if the liquid supply temperature t < the liquid supply set threshold t0 and t0-t > the supply and demand threshold t1, it indicates that there is still overcooling. Reduce the operating frequency of variable frequency water pump 2 until the liquid supply temperature t < the liquid supply set threshold t0 and t0-t ≤ the supply and demand threshold t1. This can further reduce the operating frequency of variable frequency water pump 2 to avoid overcooling and waste of cooling capacity.

[0080] Conversely, when the variable frequency refrigeration system is under medium load, if there is no overcooling in the variable frequency refrigeration system, and the liquid supply temperature t of the cooling terminal 3 is greater than the liquid supply set threshold t0, all variable frequency refrigeration modules 1 and all variable frequency water pumps 2 are turned on, and the variable frequency water pumps 2 operate at the rated frequency.

[0081] If the liquid supply temperature t > the liquid supply set threshold t0, keep the operating frequency Bf of the variable frequency water pump 2 unchanged, first increase the operating frequency Yf of the compressor 11 and the operating frequency Ff of the fan assembly 12 in the variable frequency refrigeration module 1 to reduce the liquid supply temperature t until the liquid supply temperature t ≤ the liquid supply set threshold t0; prioritize increasing the operating frequency of the compressor 11 and the fan assembly 12 to enhance the cooling capacity, rather than directly adjusting the operating frequency of the variable frequency water pump 2. This allows for a quick response to load changes, while avoiding pressure fluctuations in the variable frequency refrigeration system caused by frequent adjustments to the operating frequency of the variable frequency water pump 2, and reducing the impact of coolant flow changes on the cooling terminal 3.

[0082] When the operating frequency Yf of compressor 11 and the operating frequency Ff of fan assembly 12 both reach the upper limit threshold of operating frequency, the liquid supply temperature t is still greater than the liquid supply set threshold t0. Then, the operating frequency Bf of variable frequency water pump 2 is increased to increase the liquid supply flow rate (i.e., coolant flow rate) until the liquid supply temperature t ≤ the liquid supply set threshold t0. This can prevent damage to compressor 11 and fan assembly 12. The operating frequency of variable frequency water pump 2 is only increased under extreme conditions, which can avoid energy waste caused by long-term high-frequency operation.

[0083] In the above embodiments, in order to maintain the stability of the liquid supply temperature t, the operating frequency of the compressor 11 and the fan assembly 12 is adjusted first rather than the operating frequency of the variable frequency water pump 2 to dynamically adjust the output of the cooling capacity. On the one hand, by adjusting the operating frequency of the compressor 11 and the fan assembly 12, the load change can be responded to quickly and the output of the cooling capacity can be adjusted quickly. On the other hand, the operating frequency of the variable frequency water pump 2 can be kept as stable as possible, so that the coolant flow rate remains stable, avoiding the impact of coolant flow rate changes on the cooling terminal 3, and facilitating centralized control of the cooling terminal 3.

[0084] When the variable frequency refrigeration system is under medium or light load conditions, if the second temperature threshold T2 is greater than the ambient temperature T, the cooling demand of the cooling terminal 3 is low. All variable frequency water pumps 2 are turned on and run at the rated frequency to allow the coolant (such as high-viscosity ethylene glycol) in the variable frequency refrigeration system to circulate first, preventing the coolant from becoming viscous and ensuring that the coolant circulates at a stable flow rate. This avoids the coolant flow rate being too low due to the low ambient temperature, which would lead to an increase in heat transfer resistance.

[0085] After the preset running time, gradually reduce the number of variable frequency water pumps 2 until the number of variable frequency water pumps 2 is reduced to the water pump number threshold (such as 1 to 2) to avoid excessive coolant flow in the pipeline assembly 4.

[0086] If the liquid supply temperature t of the cooling terminal 3 gradually increases and the liquid supply temperature t > the liquid supply set threshold t0, the variable frequency cooling module 1 and variable frequency water pump 2 are turned on one by one until the liquid supply temperature t ≤ the liquid supply set threshold t0. This can gradually increase the cooling capacity of the variable frequency cooling system, so that the variable frequency cooling system always operates close to the optimal efficiency point, and avoid the situation of over-cooling caused by an excessive increase in the number of variable frequency cooling modules 1 and / or variable frequency water pumps 2 at one time.

[0087] Specifically, if the operating frequency Yf of the compressor 11 and the operating frequency Ff of the fan assembly 12 in the previous variable frequency refrigeration module 1 both reach the rated frequency, then the number of variable frequency water pumps 2 in operation will be increased; if all variable frequency water pumps 2 are already in operation, then the number of variable frequency refrigeration modules 1 in operation will be increased.

[0088] For example, when starting up the variable frequency cooling module 1 one by one, if the liquid supply temperature t is still rising when the operating frequency of the compressor 11 and fan assembly 12 of the first variable frequency cooling module 1 has been increased to the rated frequency, the variable frequency water pump 2 is added until all the variable frequency water pumps 2 are in operation. Then, the subsequent number of variable frequency cooling modules 1 are started according to the liquid supply temperature, so as to achieve energy-saving operation of the variable frequency cooling system.

[0089] The variable frequency refrigeration system prioritizes increasing the cooling capacity by increasing the operating frequency of the compressor 11 and fan assembly 12 within a single variable frequency refrigeration module 1. Only after both reach their rated frequencies will the next level of regulation be initiated (increasing the number of variable frequency water pumps 2 or variable frequency refrigeration modules 1 in operation). This reduces ineffective frequency adjustments, further lowers energy consumption, and achieves energy-saving operation.

[0090] When the variable frequency refrigeration system is in low-frequency operation, the cooling capacity demand of the cooling terminal 3 is extremely low. All variable frequency refrigeration modules 1 and all variable frequency water pumps 2 are turned on. The operating frequency Yf of the compressor 11 in the variable frequency refrigeration module 1 is less than or equal to the low-frequency threshold Yf1 of the compressor 11, the operating frequency Ff of the fan assembly 12 is less than or equal to the low-frequency threshold Ff1 of the fan, and the operating frequency Bf of the variable frequency water pump 2 is less than or equal to the low-frequency threshold Bf2 of the water pump. This makes both the variable frequency refrigeration module 1 and the variable frequency water pump 2 operate at low frequency to maintain the output of cooling capacity.

[0091] At this time, the motor speed of the variable frequency water pump 2 decreases, the coolant speed decreases, and the electromagnetic excitation force of the system weakens. This greatly reduces the mechanical vibration, hydrodynamic noise, and electromagnetic noise of the variable frequency water pump 2, and the overall vibration noise of the air conditioning equipment will also be significantly reduced, which can significantly reduce the resonance risk of the air conditioning equipment.

[0092] In the above embodiments, the control strategy of the variable frequency cooling system is shown in the following table:

[0093] This application, through the aforementioned control method, expands the operating range of the variable frequency refrigeration system and air conditioning equipment via a dual variable frequency design of the variable frequency refrigeration module 1 and the variable frequency water pump 2. Both the variable frequency refrigeration module 1 and the variable frequency water pump 2 employ variable frequency control, allowing cooling to be supplied according to actual operating conditions and demands, thus reducing the energy consumption of the variable frequency refrigeration system. The variable frequency refrigeration module 1 and the variable frequency water pump 2 can achieve real-time coordinated control, enabling the variable frequency refrigeration system to freely and smoothly switch between high ambient temperature and high load conditions and low ambient temperature and low load conditions, ensuring the high efficiency and adaptability of the variable frequency refrigeration system.

[0094] The water conservancy module adopts a multi-pump redundant operation mode. Even if some of the variable frequency water pumps 2 fail, the variable frequency refrigeration system can continue to operate stably and reliably. The water conservancy module can be designed as an independent module, truly making the air conditioning system modular. The structure can be designed by piecing together according to the required cooling capacity, shortening the design cycle.

[0095] Both the variable frequency refrigeration module 1 and the variable frequency water pump 2 can operate in the low frequency range (i.e., low frequency operation condition) in the silent state, which can significantly reduce the vibration and noise of the air conditioning equipment and realize the low vibration and low noise operation of the variable frequency refrigeration system.

[0096] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0097] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0098] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A variable frequency refrigeration system, characterized in that, include: Multiple variable frequency refrigeration modules (1) are arranged in parallel, and each variable frequency refrigeration module (1) includes a compressor (11), a fan assembly (12), and a heat exchanger assembly; Multiple variable frequency water pumps (2) are connected in parallel; Cooling terminal (3); The pipeline assembly (4) connects multiple variable frequency refrigeration modules (1) and multiple variable frequency water pumps (2) to the cooling terminal (3) through the pipeline assembly (4).

2. The variable frequency refrigeration system according to claim 1, characterized in that, The heat exchanger assembly includes a first heat exchanger (13), which is correspondingly arranged with the fan assembly (12). The fan assembly (12) drives the airflow to exchange heat with the first heat exchanger (13). The first heat exchanger (13) has a first coolant pipeline (131) connected to the pipeline assembly (4).

3. The variable frequency refrigeration system according to claim 2, characterized in that, The heat exchanger assembly further includes a second heat exchanger (14) and a third heat exchanger (15). The compressor (11) is connected to the second heat exchanger (14) and the third heat exchanger (15) respectively through a refrigerant circulation pipeline. The second heat exchanger (14) is an evaporator, and the second heat exchanger (14) has a refrigerant pipeline (141) and a second coolant pipeline (142) for heat exchange. The second coolant pipeline (142) is connected to the pipeline assembly (4).

4. The variable frequency refrigeration system according to claim 1, characterized in that, The number of the variable frequency water pumps (2) is three or more, and multiple variable frequency water pumps (2) are integrated into one unit.

5. The variable frequency refrigeration system according to any one of claims 1 to 4, characterized in that, It also includes a coolant storage tank (5), which is connected to the piping assembly (4).

6. The variable frequency refrigeration system according to any one of claims 1 to 4, characterized in that, It also includes a control unit (6), which is connected to the multiple frequency conversion refrigeration modules (1) and the multiple frequency conversion water pumps (2) respectively.

7. The variable frequency refrigeration system according to claim 6, characterized in that, It also includes a detection unit, which is signal-connected to the control unit (6). The detection unit includes multiple detection elements, including a temperature detection element, a flow detection element, and a pressure detection element.

8. An air conditioning device, characterized in that, The system includes the variable frequency refrigeration system as described in any one of claims 1 to 7, and further includes an equipment frame (7), the equipment frame (7) including a pipe installation area (71), the equipment frame (7) being symmetrically arranged with the pipe installation area (71) as the center; the pipe assembly (4) is disposed in the pipe installation area (71), and a plurality of the variable frequency refrigeration modules (1) and a plurality of the variable frequency water pumps (2) are installed in the equipment frame (7) and distributed on both sides of the pipe assembly (4).

9. A control method, characterized in that, The variable frequency refrigeration system as described in any one of claims 1 to 7 includes the following steps: Monitor ambient temperature T and cooling capacity requirement Z; The number and frequency of operation of multiple variable frequency refrigeration modules (1) and multiple variable frequency water pumps (2) are controlled according to the ambient temperature T and the cooling capacity requirement Z.

10. The control method according to claim 9, characterized in that, When the cooling capacity demand Z > the first demand threshold Z1, the variable frequency cooling system is under heavy load. When the first demand threshold Z1 ≥ cooling capacity demand Z > the second demand threshold Z2, the variable frequency refrigeration system is in a medium load condition. When the second demand threshold Z2 ≥ cooling capacity demand Z > the third demand threshold Z3, the variable frequency refrigeration system is in a light load condition. When the cooling capacity demand Z ≤ the third demand threshold Z3, the variable frequency refrigeration system is in low frequency operation mode.

11. The control method according to claim 10, characterized in that, When the variable frequency refrigeration system is under heavy load, if the ambient temperature T ≥ the first temperature threshold T1, all variable frequency refrigeration modules (1) and all variable frequency water pumps (2) are turned on, and the operating frequency Bf of the variable frequency water pumps (2) ≥ the water pump medium frequency operating threshold Bf1; If the liquid supply temperature t of the cooling terminal (3) is greater than the liquid supply setting threshold t0, keep the operating frequency Bf of the variable frequency water pump (2) unchanged, first increase the operating frequency Yf of the compressor (11) and the operating frequency Ff of the fan assembly (12) in the variable frequency refrigeration module (1) to reduce the liquid supply temperature t until the liquid supply temperature t ≤ the liquid supply setting threshold t0. When the operating frequency Yf of the compressor (11) and the operating frequency Ff of the fan assembly (12) both reach the upper limit threshold of the operating frequency, if the liquid supply temperature t is still greater than the liquid supply set threshold t0, the operating frequency Bf of the variable frequency water pump (2) is increased until the liquid supply temperature t ≤ the liquid supply set threshold t0.

12. The control method according to claim 11, characterized in that, When the variable frequency cooling system is under medium load, if the first temperature threshold T1 > the ambient temperature T ≥ the second temperature threshold T2, all variable frequency cooling modules (1) and all variable frequency water pumps (2) are turned on, and the variable frequency water pumps (2) operate at the rated frequency. If the liquid supply temperature t of the cooling terminal (3) is less than the liquid supply setting threshold t0, and t0-t > the supply and demand threshold t1, keep the operating frequency Bf of the variable frequency water pump (2) unchanged, first reduce the operating frequency Yf of the compressor (11) and the operating frequency Ff of the fan assembly (12) in the variable frequency refrigeration module (1) to increase the liquid supply temperature t until the liquid supply temperature t is less than the liquid supply setting threshold t0, and t0-t ≤ the supply and demand threshold t1; When the operating frequency Yf of the compressor (11) and the operating frequency Ff of the fan assembly (12) both reach the lower limit threshold of the operating frequency, if the liquid supply temperature t < the liquid supply setting threshold t0 and t0-t > the supply and demand threshold t1, then the number of operation of the variable frequency refrigeration module (1) is reduced until the liquid supply temperature t < the liquid supply setting threshold t0 and t0-t ≤ the supply and demand threshold t1; When the number of variable frequency cooling modules (1) is reduced to at least the number threshold of cooling modules, if the liquid supply temperature t < the liquid supply setting threshold t0 and t0-t > the supply and demand threshold t1, then the operating frequency of the variable frequency water pump (2) is reduced until the liquid supply temperature t < the liquid supply setting threshold t0 and t0-t ≤ the supply and demand threshold t1.

13. The control method according to claim 12, characterized in that, When the variable frequency cooling system is under medium load, if the first temperature threshold T1 > the ambient temperature T ≥ the second temperature threshold T2, all variable frequency cooling modules (1) and all variable frequency water pumps (2) are turned on, and the variable frequency water pumps (2) operate at the rated frequency. If the liquid supply temperature t of the cooling terminal (3) is greater than the liquid supply setting threshold t0, keep the operating frequency Bf of the variable frequency water pump (2) unchanged, first increase the operating frequency Yf of the compressor (11) and the operating frequency Ff of the fan assembly (12) in the variable frequency refrigeration module (1) to reduce the liquid supply temperature t until the liquid supply temperature t ≤ the liquid supply setting threshold t0. When the operating frequency Yf of the compressor (11) and the operating frequency Ff of the fan assembly (12) both reach the upper limit threshold of the operating frequency, if the liquid supply temperature t is still greater than the liquid supply set threshold t0, the operating frequency Bf of the variable frequency water pump (2) is increased until the liquid supply temperature t ≤ the liquid supply set threshold t0.

14. The control method according to claim 12, characterized in that, When the variable frequency refrigeration system is under medium or light load conditions, if the second temperature threshold T2 is greater than the ambient temperature T, all variable frequency water pumps (2) are turned on and the variable frequency water pumps (2) operate at the rated frequency. After running for a preset time, the number of variable frequency water pumps (2) is gradually reduced until the number of variable frequency water pumps (2) is reduced to the water pump number threshold. If the liquid supply temperature t of the cooling terminal (3) gradually increases and the liquid supply temperature t > the liquid supply set threshold t0, the variable frequency cooling module (1) and the variable frequency water pump (2) are turned on one by one until the liquid supply temperature t ≤ the liquid supply set threshold t0.

15. The control method according to claim 14, characterized in that, When the variable frequency cooling module (1) and the variable frequency water pump (2) are turned on one by one, if the operating frequency Yf of the compressor (11) and the operating frequency Ff of the fan assembly (12) in the previous variable frequency cooling module (1) both reach the rated frequency, then the number of variable frequency water pumps (2) in operation is increased; if all variable frequency water pumps (2) are already in operation, then the number of variable frequency cooling modules (1) in operation is increased.

16. The control method according to claim 10, characterized in that, When the variable frequency refrigeration system is in low frequency operation, all variable frequency refrigeration modules (1) and all variable frequency water pumps (2) are turned on. The operating frequency Yf of the compressor (11) in the variable frequency refrigeration module (1) is less than or equal to the compressor low frequency threshold Yf1, the operating frequency Ff of the fan assembly (12) is less than or equal to the fan low frequency threshold Ff1, and the operating frequency Bf of the variable frequency water pump (2) is less than or equal to the water pump low frequency threshold Bf2.

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