Fan control method and device for air conditioning system, air conditioning system and computer readable storage medium

Abstract

The invention relates to the technical field of refrigeration equipment, and discloses a fan control method for an air conditioning system. Under the condition that the exhaust pressure shows that the fan opening and closing requirement exists, the change trend of the exhaust pressure in the adjacent sampling periods is obtained; and according to the change trend of the exhaust pressure, the fan is controlled to execute loading operation or unloading operation. The method can ensure the stability of exhaust pressure high-pressure value control. The invention further discloses a fan control device for the air conditioning system, the air conditioning system and a computer readable storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, for example, to a fan control method and device for an air conditioning system, an air conditioning system, and a computer-readable storage medium. Background Art

[0002] Currently, air-cooled screw chillers are mainly applied to scenarios with year-round refrigeration requirements in data centers, computer rooms, and laboratories. To achieve year-round refrigeration, especially low-temperature refrigeration, it is required that the refrigeration equipment stably control the high-pressure value of the exhaust pressure. By stably controlling the high-pressure value of the exhaust pressure, it helps to establish and maintain the stability of the pressure difference, thereby ensuring the oil return operation of the compressor. Based on this, for scenarios with year-round refrigeration requirements, how to control the stability of the high-pressure value of the exhaust pressure has become a technical problem that needs to be solved urgently.

[0003] To control the stability of the high-pressure value of the exhaust pressure, related technologies adopt fixed-frequency fan-related control.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in related technologies:

[0005] Fixed-frequency fans are extremely prone to start-stop fluctuations under low-temperature refrigeration, and it is difficult to stably control the high-pressure value of the exhaust pressure, which will reduce the operating stability of air-cooled screw chillers.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0008] Embodiments of the present disclosure provide a fan control method, device, air conditioning system, and computer-readable storage medium for an air conditioning system to ensure the stability of the control of the high-pressure value of the exhaust pressure.

[0009] In some embodiments, the method includes: obtaining the exhaust pressure of the compressor; obtaining the change trend of the exhaust pressure within an adjacent sampling period when the exhaust pressure indicates a need to start or stop the fan; and controlling the fan to perform a loading operation or an unloading operation according to the change trend of the exhaust pressure.

[0010] In some embodiments, obtaining the change trend of the exhaust pressure within adjacent sampling periods includes: obtaining the starting exhaust pressure at the starting moment within the current sampling period and the first current exhaust pressure at the ending moment within the current sampling period; obtaining the reference exhaust pressure at the starting moment within the previous sampling period; determining the difference between the starting exhaust pressure and the reference exhaust pressure as the first exhaust pressure change amount, and determining the difference between the first current exhaust pressure and the starting exhaust pressure as the second exhaust pressure change amount; and determining the change trend of the exhaust pressure within adjacent sampling periods according to the first exhaust pressure change amount and the second exhaust pressure change amount.

[0011] In some embodiments, controlling the fan to perform a loading operation or an unloading operation according to the change trend of the exhaust pressure includes: in the case where the exhaust pressure indicates a need to turn on the fan, if the first exhaust pressure change amount is less than the second exhaust pressure change amount, controlling the fan to perform a loading operation; in the case where the exhaust pressure indicates a need to turn off the fan, if the first exhaust pressure change amount is greater than the second exhaust pressure change amount, controlling the fan to perform an unloading operation.

[0012] In some embodiments, the air conditioning system includes a set number of two-speed constant-frequency fans and a set number of single-speed constant-frequency fans, and the two-speed constant-frequency fans and the single-speed constant-frequency fans are arranged crosswise in the horizontal direction. Controlling the fan to perform a loading operation includes: controlling the fan to perform a loading operation according to the fan loading strategy; wherein, the fan loading strategy includes turning on the two-speed constant-frequency fans one by one according to the startup cycle, and after turning on all the two-speed constant-frequency fans, turning on the single-speed constant-frequency fans one by one according to the startup cycle. Turning on the two-speed constant-frequency fans includes turning on the low gear and the high gear of the two-speed constant-frequency fans in sequence.

[0013] In some embodiments, the air conditioning system includes a set number of two-speed constant-frequency fans and a set number of single-speed constant-frequency fans, and the two-speed constant-frequency fans and the single-speed constant-frequency fans are arranged crosswise in the horizontal direction. Controlling the fan to perform an unloading operation includes: controlling the fan to perform an unloading operation according to the fan loading strategy; wherein, the fan unloading strategy includes turning off the single-speed constant-frequency fans one by one according to the shutdown cycle, and after turning off all the single-speed constant-frequency fans, turning off the two-speed constant-frequency fans one by one according to the shutdown cycle. Turning off the two-speed constant-frequency fans includes turning off the high gear and the low gear of the two-speed constant-frequency fans in sequence.

[0014] In some embodiments, determining the need to turn on or off the fan is performed in the following manner: in the case where the exhaust pressure is greater than or equal to the lower limit value of the shutdown exhaust pressure and less than the upper limit value of the shutdown exhaust pressure, determining that there is a need to turn off the fan; in the case where the exhaust pressure is greater than or equal to the lower limit value of the startup exhaust pressure and less than the upper limit value of the startup exhaust pressure, determining that there is a need to turn on the fan; wherein, the upper limit value of the shutdown exhaust pressure is less than the lower limit value of the startup exhaust pressure.

[0015] In some embodiments, the fan control device includes a processor and a memory storing program instructions, and the processor is configured to execute the fan control method for an air conditioning system as described above when running the program instructions.

[0016] In some embodiments, the air conditioning system includes: an air conditioning system body including a set number of two-speed constant-frequency fans and a set number of single-speed constant-frequency fans; and the device for an air conditioning system as described above, installed on the air conditioning system body.

[0017] In some embodiments, the two-speed constant-frequency fans and the single-speed constant-frequency fans are arranged crosswise in the horizontal direction.

[0018] In some embodiments, the computer-readable storage medium stores program instructions, and when the program instructions are running, they are used to cause a computer to execute the fan control method for an air conditioning system as described above.

[0019] The fan control method, device, air conditioning system, and computer-readable storage medium provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] In the embodiments of the present disclosure, the air conditioning system first obtains the discharge pressure of the compressor. When the discharge pressure indicates a need to open or close the fan, it means that the fan needs to be further opened or closed. At this time, the embodiments of the present disclosure obtain the change trend of the discharge pressure in adjacent sampling periods, and control the fan to perform a loading operation or an unloading operation according to the change trend of the discharge pressure. Since the change trend of the discharge pressure in adjacent sampling periods can reliably reflect the floating condition of the discharge pressure in consecutive sampling periods, therefore, by adjusting the loading and unloading of the fan according to the change trend of the discharge pressure, sudden changes in the discharge pressure can be avoided, thereby ensuring the stability of the high-pressure value of the discharge pressure.

[0021] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. Description of the Drawings

[0022] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0023] Figure 1 is a top view of the fan arrangement in the air conditioning system provided by the embodiments of the present disclosure;

[0024] Figure 2 is a schematic diagram of a fan control method for an air conditioning system provided by the embodiments of the present disclosure;

[0025] Figure 3 It is a schematic diagram of another fan control method for an air conditioning system provided by an embodiment of the present disclosure;

[0026] Figure 4 It is a schematic diagram of another fan control method for an air conditioning system provided by an embodiment of the present disclosure;

[0027] Figure 5 It is an application schematic diagram of an embodiment of the present disclosure;

[0028] Figure 6 It is a schematic diagram of a fan control device for an air conditioning system provided by an embodiment of the present disclosure. Detailed implementation manners

[0029] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The attached drawings are only for reference and explanation, and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, multiple details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner.

[0030] In the embodiments of the present disclosure, terms such as "first" and "second" in the specification, claims and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0031] Unless otherwise specified, the term "plurality" means two or more.

[0032] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0033] The term "and / or" is a description of the association relationship of an object, indicating that three relationships can exist. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0034] The term "corresponding" may refer to an association relationship or a binding relationship. A corresponding to B means that there is an association relationship or a binding relationship between A and B.

[0035] Figure 1 It is a top view of the fan arrangement in the air conditioning system provided by the embodiment of the present disclosure. Among them, X represents the horizontal direction. Combining Figure 1As shown in the figure, the air conditioning system includes a screw compressor, a set number of two-speed constant-frequency fans and a set number of single-speed constant-frequency fans. Among them, the two-speed constant-frequency fans and the single-speed constant-frequency fans are arranged horizontally in a cross pattern. The cross arrangement means that a single two-speed constant-frequency fan is adjacent to a single single-speed constant-frequency fan. Preferably, the set number is greater than or equal to 4 and less than or equal to 8.

[0036] In the embodiment of the present disclosure, the air conditioning system can be a screw chiller. The screw chiller further includes an evaporator, a condenser, and an electronic expansion valve that are sequentially connected through pipelines. The evaporator and the condenser are also respectively connected to the screw compressor. The working principle of the screw chiller is as follows: The gaseous refrigerant output by the evaporator is compressed by the screw compressor and then converted into a high-temperature and high-pressure refrigerant. The gaseous refrigerant compressed by the screw compressor is condensed by the condenser and then converted into a low-temperature and low-pressure liquid refrigerant. The liquid refrigerant is then throttled by the electronic expansion valve and converted into a gas-liquid mixed refrigerant. Among them, the liquid refrigerant is reheated by the evaporator and converted back into a gaseous refrigerant, and then flows back into the screw compressor through the pipeline to start a new refrigerant cycle.

[0037] As an example, as Figure 1 shown, when the set number is four, the fan arrangement can be two rows of fan groups arranged horizontally in parallel. One group of fan groups is sequentially composed of a two-speed constant-frequency fan F1, a single-speed constant-frequency fan F3, a two-speed constant-frequency fan F5, and a single-speed constant-frequency fan F7. The other group of fan groups is sequentially composed of a single-speed constant-frequency fan F2, a two-speed constant-frequency fan F4, a single-speed constant-frequency fan F6, and a two-speed constant-frequency fan F8. In a specific implementation, as shown in Table 1, the constant-frequency fan voltages of the two-speed constant-frequency fan F1 and the single-speed constant-frequency fan F2 are the same, both being V1. The constant-frequency fan voltages of the single-speed constant-frequency fan F3 and the two-speed constant-frequency fan F4 are the same, both being V2. The constant-frequency fan voltages of the two-speed constant-frequency fan F5 and the single-speed constant-frequency fan F6 are the same, both being V3. The constant-frequency fan voltages of the single-speed constant-frequency fan F7 and the two-speed constant-frequency fan F8 are the same, both being V4.

[0038] Table 1 Constant-frequency fan voltage values of two-speed constant-frequency fans and single-speed constant-frequency fans

[0039]

[0040] Based on Figure 1 the shown fan arrangement method, combined with Figure 2 as shown, the embodiment of the present disclosure provides a fan control method for an air conditioning system, including:

[0041] S01, the air conditioning system obtains the exhaust pressure of the compressor.

[0042] S02. When the exhaust pressure indicates a need to start or stop the fan, the air conditioning system obtains the change trend of the exhaust pressure within adjacent sampling periods.

[0043] S03. The air conditioning system controls the fan to perform a loading operation or an unloading operation according to the change trend of the exhaust pressure.

[0044] By using the fan control method for an air conditioning system provided in the embodiments of the present disclosure, the air conditioning system in the embodiments of the present disclosure first obtains the exhaust pressure of the compressor. When the exhaust pressure indicates a need to start or stop the fan, it means that it is necessary to further start or stop the fan. At this time, the embodiments of the present disclosure obtain the change trend of the exhaust pressure within adjacent sampling periods, and control the fan to perform a loading operation or an unloading operation according to the change trend of the exhaust pressure. Since the change trend of the exhaust pressure within adjacent sampling periods can reliably reflect the floating condition of the exhaust pressure within consecutive sampling periods, therefore, by adjusting the fan load according to the change trend of the exhaust pressure, sudden changes in the exhaust pressure can be avoided, thereby ensuring the stability of the high-pressure value of the exhaust pressure.

[0045] In addition, the related art also controls the high-pressure value of the exhaust pressure through a variable-frequency fan. However, although the variable-frequency fan has an advantage in the control stability of the high-pressure value of the exhaust pressure, its cost is relatively high. The embodiments of the present disclosure adopt a two-speed fixed-frequency fan and a single-speed fixed-frequency fan, and the cost of the fixed-frequency fan is significantly lower than that of the variable-frequency fan. Compared with the solution of using a variable-frequency fan in the related art, the embodiments of the present disclosure can take into account both the control stability of the high-pressure value of the exhaust pressure and the unit cost.

[0046] Optionally, as shown in Figure 3 The air conditioning system obtains the change trend of the exhaust pressure within adjacent sampling periods, including:

[0047] S11. The air conditioning system obtains the starting exhaust pressure at the starting moment within the current sampling period and the first current exhaust pressure at the ending moment within the current sampling period.

[0048] S12. The air conditioning system obtains the reference exhaust pressure at the starting moment within the previous sampling period.

[0049] S13. The air conditioning system determines the difference between the starting exhaust pressure and the reference exhaust pressure as the first exhaust pressure change amount, and determines the difference between the first current exhaust pressure and the starting exhaust pressure as the second exhaust pressure change amount.

[0050] S14. The air conditioning system determines the change trend of the exhaust pressure within adjacent sampling periods according to the first exhaust pressure change amount and the second exhaust pressure change amount.

[0051] In this way, in the embodiment of the present disclosure, the air conditioning system first obtains the starting exhaust pressure at the starting moment within the current sampling period and the first current exhaust pressure at the ending moment within the current sampling period. Then, it obtains the reference exhaust pressure at the starting moment within the previous sampling period, and determines the difference between the starting exhaust pressure and the reference exhaust pressure as the first exhaust pressure change amount and the difference between the first current exhaust pressure and the starting exhaust pressure as the second exhaust pressure change amount. Finally, according to the first exhaust pressure change amount and the second exhaust pressure change amount, it determines the change trend of the exhaust pressure within adjacent sampling periods, thereby accurately knowing the deviation of the exhaust pressure change amount within adjacent sampling periods, which is beneficial to subsequent relevant control of the high exhaust pressure value and ensures the reliability of the exhaust pressure value control.

[0052] Optionally, as shown in Figure 4 the air conditioning system controls the fan to perform a loading operation or an unloading operation according to the change trend of the exhaust pressure, including:

[0053] S21, when the exhaust pressure indicates a need to turn on the fan, if the first exhaust pressure change amount is less than the second exhaust pressure change amount, the air conditioning system controls the fan to perform a loading operation.

[0054] S22, when the exhaust pressure indicates a need to turn off the fan, if the first exhaust pressure change amount is greater than the second exhaust pressure change amount, the air conditioning system controls the fan to perform an unloading operation.

[0055] In this way, when it is determined that there is a need to turn on the fan, if the first exhaust pressure change amount is less than the second exhaust pressure change amount, it means that the exhaust pressure change amount has an increasing trend within adjacent sampling periods and a high exhaust pressure value appears at the ending moment within the current sampling period. At this time, it is necessary to turn on the corresponding number of fans to implement the fan loading operation. When it is determined that there is a need to turn off the fan, if the first exhaust pressure change amount is greater than the second exhaust pressure change amount, it means that the exhaust pressure change amount has a decreasing trend within adjacent sampling periods and a high exhaust pressure value appears at the starting moment within the current sampling period. At this time, it is necessary to turn off the corresponding number of fans to implement the fan unloading operation. Thus, in the embodiment of the present disclosure, by comparing the exhaust pressure change amount of the current sampling period with that of the previous sampling period, the change trend and specific deviation of the exhaust pressure within adjacent sampling periods can be accurately known. Based on this, the fan loading and unloading operations are performed, which can better control the high exhaust pressure value, ensuring both the stability of the high exhaust pressure value and the reliability of the high exhaust pressure value control.

[0056] Optionally, the air conditioning system controls the fan to perform a loading operation, including:

[0057] The air conditioning system controls the fan to perform a loading operation according to the fan loading strategy.

[0058] Among them, the fan loading strategy includes turning on the two-speed fixed-frequency fans one by one according to the startup cycle, and turning on the single-speed fixed-frequency fans one by one according to the startup cycle after all the two-speed fixed-frequency fans are turned on. Turning on the two-speed fixed-frequency fans includes turning on the low gear of the two-speed fixed-frequency fan and the high gear of the two-speed fixed-frequency fan in sequence.

[0059] In this way, in the embodiment of the present disclosure, the air-conditioning system can turn on the two-speed fixed-frequency fans one by one according to the fan loading strategy, or turn on the single-speed fixed-frequency fans one by one. Even if there are on-off fluctuations during the operation of any one of the two-speed fixed-frequency fans or any one of the single-speed fixed-frequency fans, the air-conditioning system can successfully achieve loading by performing corresponding turning-on control on other fixed-frequency fans, which is more conducive to improving the stability and reliability of the control of the high-pressure value of the exhaust pressure.

[0060] As an example, the set number is four. That is, there are four two-speed fixed-frequency fans and four single-speed fixed-frequency fans. The air-conditioning system turns on the two-speed fixed-frequency fans one by one according to the startup cycle, and turns on the single fixed-frequency fans one by one according to the startup cycle after all the two-speed fixed-frequency fans are turned on. It can be: the air-cooled screw chiller turns on the low gear of any one of the two-speed fixed-frequency fans in the first startup cycle, then turns on the high gear of the two-speed fixed-frequency fan with the low gear turned on in the second startup cycle, then turns on the low gear of any other two-speed fixed-frequency fan in the third startup cycle, and again, turns on the high gear of the two-speed fixed-frequency fan with the low gear turned on in the second startup cycle in the fourth startup cycle, until the high gear of the last two-speed fixed-frequency fan is turned on in the eighth startup cycle. Then, turn on any one of the single-speed fixed-frequency fans in the ninth startup cycle, and then turn on any other single-speed fixed-frequency fan in the tenth startup cycle, until the last single-speed fixed-frequency fan is turned on in the twelfth startup cycle.

[0061] It should be noted that the air-conditioning system configures one operation in the above example as one fan upgrading operation, and the number of levels corresponding to the set number of four is twelve levels. In actual applications, the air-conditioning system can perform fan loading according to the above fan upgrading operation.

[0062] As shown in Table 2, Table 2 shows the relationship between the fan levels and the gears of the single- and two-speed fixed-frequency fans.

[0063] Table 2 Relationship between fan levels and gears of single- and two-speed fixed-frequency fans

[0064]

[0065] As shown in Table 1 and Table 2, the fan loading strategy is: all fixed-frequency fans are turned off → A → A* → B → B* → C → C* → D → D* → E → F → G → H.

[0066] In addition, when the exhaust pressure indicates a need to turn on the fan, the air conditioning system controls the fan to perform a loading operation or an unloading operation according to the changing trend of the exhaust pressure. It further includes: when the first exhaust pressure change amount is greater than or equal to the second exhaust pressure change amount, the air conditioning system does not perform the fan loading operation and the fan unloading operation.

[0067] Optionally, the air conditioning system controls the fan to perform an unloading operation, including:

[0068] The air conditioning system controls the fan to perform an unloading operation according to the fan loading strategy.

[0069] Among them, the fan unloading strategy includes turning off single-speed constant-frequency fans one by one according to the shutdown cycle, and after turning off all single-speed constant-frequency fans, turning off two-speed constant-frequency fans one by one according to the shutdown cycle. Turning off two-speed constant-frequency fans includes turning off the high gear and the low gear of the two-speed constant-frequency fan in sequence.

[0070] In this way, in the embodiments of the present disclosure, the air conditioning system can turn off single-speed constant-frequency fans one by one according to the fan unloading strategy, or turn off two-speed constant-frequency fans one by one. Even if there are on-off fluctuations during the operation of any one two-speed constant-frequency fan or any one single-speed constant-frequency fan, the air conditioning system can successfully achieve unloading by performing corresponding shutdown control on other constant-frequency fans, which is more conducive to improving the stability and reliability of the control of the high-pressure value of the exhaust pressure.

[0071] As an example, the set number is four. That is, there are four two-speed constant-frequency fans and four single-speed constant-frequency fans. The air conditioning system turns off single-speed constant-frequency fans one by one according to the shutdown cycle, and after turning off all single-speed constant-frequency fans, turns off two-speed constant-frequency fans one by one according to the shutdown cycle, which can be: the air-cooled screw chiller turns off any one single-speed constant-frequency fan in the first shutdown cycle, then turns off any other single-speed constant-frequency fan in the second shutdown cycle, then turns off any other single-speed constant-frequency fan in the third shutdown cycle. Again, in the fourth shutdown cycle, it turns off the high gear of the last single-speed constant-frequency fan, and in the fifth shutdown cycle, it turns off the high gear of any one two-speed constant-frequency fan. Then, in the sixth shutdown cycle, it turns off the low gear of the two-speed constant-frequency fan in the fifth shutdown cycle, and then in the seventh shutdown cycle, it turns off the high gear of any other two-speed constant-frequency fan, until it turns off the low gear of the last two-speed constant-frequency fan in the twelfth shutdown cycle.

[0072] It should be noted that the air conditioning system configures one operation in the above example as one fan unloading level operation, and when the set number is four, the corresponding number of levels is twelve levels. In actual applications, the air conditioning system can perform fan unloading according to the above fan unloading level operation.

[0073] As shown in Table 1 and Table 2, the fan load reduction strategy is: H → G → F → E → D* → D → C* → C → B* → B → A* → A → all fixed-frequency fans are turned off.

[0074] In addition, when the exhaust pressure indicates a need to turn off the fan, the air-conditioning system controls the fan to perform a loading operation or a load reduction operation according to the change trend of the exhaust pressure. It also includes: when the first exhaust pressure change amount is less than or equal to the second exhaust pressure change amount, the air-conditioning system does not perform the fan load reduction operation and the fan loading operation.

[0075] Optionally, the air-conditioning system determines the need to turn on or off the fan in the following manner, including:

[0076] When the exhaust pressure is greater than or equal to the lower limit value of the shutdown exhaust pressure and less than the upper limit value of the shutdown exhaust pressure, the air-conditioning system determines that there is a need to turn off the fan.

[0077] When the exhaust pressure is greater than or equal to the lower limit value of the startup exhaust pressure and less than the upper limit value of the startup exhaust pressure, the air-conditioning system determines that there is a need to turn on the fan.

[0078] Among them, the upper limit value of the shutdown exhaust pressure is less than the lower limit value of the startup exhaust pressure.

[0079] In this way, in the embodiment of the present disclosure, the air-conditioning system can determine whether subsequent fan shutdown operations or fan startup operations are required based on the specific value of the exhaust pressure, so as to accurately trigger the fan loading operation or the fan load reduction operation.

[0080] In practical applications, as Figure 5 shown, P d1 represents the lower limit value of the shutdown exhaust pressure, and P d2 represents the upper limit value of the shutdown exhaust pressure. P d3 represents the lower limit value of the startup exhaust pressure, and P d4 represents the upper limit value of the startup exhaust pressure. T1 represents the startup cycle, and T2 represents the shutdown cycle.

[0081] The fan control method for the air-conditioning system specifically performs the following steps:

[0082] S31, the screw chiller obtains the exhaust pressure P d .

[0083] S32, when P d1 ≤Pd<P d2 , the air-cooled screw chiller determines that there is a need to turn off the fan and executes step S36.

[0084] S33, when P d3 ≤Pd<P d4When the air-cooled screw chiller determines that there is a need to turn on the fan, step S36 is executed.

[0085] S34. When P d2 ≤Pd < P d3 the screw chiller unit maintains the current status of the fan unchanged.

[0086] S35. When Pd ≥ P d4 the screw chiller unit immediately controls all fixed-frequency fans to turn on.

[0087] S36. The air-cooled screw chiller determines ΔP d1 and ΔP d2 . ΔP d1 = P d02 - P d03 , ΔP d2 = P d01 - P d02 . P d01 represents the second current discharge pressure at the end moment within the current sampling period, P d02 represents the discharge pressure at the start moment within the current sampling period, and P d03 represents the reference discharge pressure at the start moment within the previous sampling period.

[0088] S37. When there is a need to turn on the fan, if ΔP d2 > ΔP d1 the screw chiller unit turns on the two-speed fixed-frequency fans one by one according to T1, and after turning on all the two-speed fixed-frequency fans, turns on the single-speed fixed-frequency fans one by one according to T1.

[0089] S38. When there is a need to turn off the fan, if ΔP d2 < ΔP d1 the screw chiller unit turns off the single-speed fixed-frequency fans one by one according to T2, and after turning off all the single-speed fixed-frequency fans, turns off the two-speed fixed-frequency fans one by one according to T2.

[0090] Combined with Figure 6 as shown, the embodiment of the present disclosure provides a fan control device 70 for an air-conditioning system, including a processor 700 and a memory 701. Optionally, the device 70 may further include a communication interface 702 and a bus 703. Among them, the processor 700, the communication interface 702, and the memory 701 can complete mutual communication through the bus 703. The communication interface 702 can be used for information transmission. The processor 700 can call the logical instructions in the memory 701 to execute the fan control method for the air-conditioning system in the above embodiment.

[0091] In addition, when the logical instructions in the above-mentioned memory 701 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0092] As a computer-readable storage medium, the memory 701 can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 700 executes functional applications and data processing by running the program instructions / modules stored in the memory 701, that is, implements the fan control method for the air-conditioning system in the above embodiments.

[0093] The memory 701 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 701 may include a high-speed random access memory and may also include a non-volatile memory.

[0094] The embodiments of the present disclosure provide an air-conditioning system, including: an air-conditioning system body, and the above-mentioned fan control device 70 for the air-conditioning system. The air-conditioning system body includes a set number of two-speed constant-frequency fans and a set number of single-speed constant-frequency fans. The fan control device 70 for the air-conditioning system is installed on the air-conditioning system body. The installation relationship described here is not limited to being placed inside the air-conditioning system body, but also includes installation connections with other components of the air-conditioning system, including but not limited to physical connections, electrical connections, or signal transmission connections, etc. Those skilled in the art can understand that the fan control device 70 for the air-conditioning system can be adapted to a feasible air-conditioning system main body, and thus implement other feasible embodiments.

[0095] The embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are set to execute the above-mentioned fan control method for the air-conditioning system.

[0096] The technical solutions of the embodiments of the present disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, such as: USB flash drive, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk, or optical disc, etc., which are various media that can store program codes.

[0097] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing embodiments and do not limit the claims. As used in the description of embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, or apparatus comprising the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0098] Those skilled in the art will realize that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software can depend on the specific application and design constraints of the technical solution. The skilled person can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the sake of convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0099] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms. The units described as separate components can be or can not be physically separated. The components displayed as units can be or can not be physical units, that is, they can be located in one place or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can physically exist alone, or two or more units can be integrated in one unit.

[0100] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the block can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. Each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A fan control method for an air conditioning system, characterized in that, Including: Obtain the exhaust pressure of the compressor; When the exhaust pressure indicates a need to open or close the fan, obtain the change trend of the exhaust pressure within adjacent sampling periods; Control the fan to perform a loading operation or an unloading operation according to the change trend of the exhaust pressure.

2. The method according to claim 1, characterized in that Obtaining the change trend of the exhaust pressure within adjacent sampling periods includes: Obtain the starting exhaust pressure at the starting moment within the current sampling period and the first current exhaust pressure at the ending moment within the current sampling period; Obtain the reference exhaust pressure at the starting moment within the previous sampling period; Determine the difference between the starting exhaust pressure and the reference exhaust pressure as the first exhaust pressure change amount, and determine the difference between the first current exhaust pressure and the starting exhaust pressure as the second exhaust pressure change amount; Determine the change trend of the exhaust pressure within adjacent sampling periods according to the first exhaust pressure change amount and the second exhaust pressure change amount.

3. The method according to claim 2, wherein Controlling the fan to perform a loading operation or an unloading operation according to the change trend of the exhaust pressure includes: When the exhaust pressure indicates a need to turn on the fan, if the first exhaust pressure change amount is less than the second exhaust pressure change amount, control the fan to perform a loading operation; When the exhaust pressure indicates a need to turn off the fan, if the first exhaust pressure change amount is greater than the second exhaust pressure change amount, control the fan to perform an unloading operation.

4. The method according to claim 3, characterized in that, The air-conditioning system includes a set number of two-speed constant-frequency fans and a set number of single-speed constant-frequency fans. The two-speed constant-frequency fans and the single-speed constant-frequency fans are arranged crosswise in the horizontal direction. Controlling the fan to perform a loading operation includes: Control the fan to perform a loading operation according to the fan loading strategy; Among them, the fan loading strategy includes turning on the two-speed constant-frequency fans one by one according to the startup cycle, and turning on the single-speed constant-frequency fans one by one according to the startup cycle after all the two-speed constant-frequency fans are turned on. Turning on the two-speed constant-frequency fans includes turning on the low gear and the high gear of the two-speed constant-frequency fans in sequence.

5. The method according to claim 3, characterized in that, The air-conditioning system includes a set number of two-speed constant-frequency fans and a set number of single-speed constant-frequency fans. The two-speed constant-frequency fans and the single-speed constant-frequency fans are arranged crosswise in the horizontal direction. Controlling the fan to perform an unloading operation includes: Control the fan to perform an unloading operation according to the fan loading strategy; Among them, the fan unloading strategy includes turning off the single-speed constant-frequency fans one by one according to the shutdown cycle, and turning off the two-speed constant-frequency fans one by one according to the shutdown cycle after all the single-speed constant-frequency fans are turned off. Turning off the two-speed constant-frequency fans includes turning off the high gear and the low gear of the two-speed constant-frequency fans in sequence.

6. The method according to any one of claims 1 to 5, characterized in that, Determine the need to open or close the fan in the following manner, including: When the exhaust pressure is greater than or equal to the lower limit value of the shutdown exhaust pressure and less than the upper limit value of the shutdown exhaust pressure, determine that there is a need to turn off the fan; When the exhaust pressure is greater than or equal to the lower limit value of the startup exhaust pressure and less than the upper limit value of the startup exhaust pressure, determine that there is a need to turn on the fan; Among them, the upper limit value of the shutdown exhaust pressure is less than the lower limit value of the startup exhaust pressure.

7. A fan control device for an air conditioning system, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the fan control method for the air-conditioning system according to any one of claims 1 to 6 when running the program instructions.

8. An air conditioning system, characterized in that, Including: The air-conditioning system body, including a set number of two-speed constant-frequency fans and a set number of single-speed constant-frequency fans; The air-conditioning system device according to claim 7 is installed on the air-conditioning system main body.

9. The air conditioning system according to claim 8, wherein The two-speed constant-frequency fan and the single-speed constant-frequency fan are arranged horizontally in a crosswise manner.

10. A computer-readable storage medium storing program instructions, characterized in that, When the program instructions are running, they are used to cause a computer to execute the fan control method for an air-conditioning system according to any one of claims 1 to 6.

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