Air conditioning system external fan control method, device, electronic device and storage medium

Abstract

The present application discloses a method, device, electronic device and storage medium for controlling an external fan of an air-conditioning system, wherein the method comprises: when it is detected that the oscillation amplitude of the pressure value on the high-pressure side of the system is greater than a preset amplitude, confirming a target pressure value based on the current evaporating pressure, a first set threshold value and the oscillation amplitude; and controlling the external fan to operate at a target speed according to the target pressure value, thereby reducing the probability of periodic fluctuations in the high pressure and improving system stability.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a method, device, electronic equipment and storage medium for controlling an external fan of an air conditioning system. Background Art

[0002] With the proposal and promotion of a series of information projects such as "Internet+" and "big data application", the scale and number of data centers have developed rapidly and become a major electricity consumer in the information society. Data centers have provided great convenience for the development of modern society, but at the same time, their power consumption remains high.

[0003] In actual use, computer room air conditioners often have long pipes and high drop conditions. Under such conditions, the pipeline pressure loss of the computer room air conditioning system will be very large. In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: according to the existing control method, the high pressure will fluctuate periodically, and the cooling capacity output will be unstable, affecting the stability of the entire system.

[0004] Therefore, a new control logic is urgently needed to reduce the probability of periodic fluctuations in high voltage and improve system stability. Summary of the invention

[0005] The present application provides a method, device, electronic device and storage medium for controlling an external fan of an air-conditioning system. The new external fan control logic is adopted to reduce the probability of periodic fluctuations on the high-pressure side of the air-conditioning system and improve the system stability.

[0006] In a first aspect, a method for controlling an external fan of an air conditioning system is provided, comprising:

[0007] When it is detected that the oscillation amplitude of the pressure value on the high-pressure side of the system is greater than a preset amplitude, the target pressure value is confirmed according to the current evaporation pressure, the first set threshold value and the oscillation amplitude;

[0008] The external fan is controlled to run at a target speed according to the target pressure value.

[0009] Optionally, before confirming the target pressure value according to the current evaporation pressure, the first set threshold value and the oscillation amplitude, the method further includes:

[0010] Obtaining the maximum pressure value and the minimum pressure value on the high pressure side of the system within a preset period;

[0011] The oscillation amplitude of the pressure value on the high-pressure side of the system is calculated according to the maximum pressure value and the minimum pressure value on the high-pressure side of the system within the preset period.

[0012] Optionally, determining the target pressure value according to the current evaporation pressure, the first set threshold value and the oscillation amplitude includes:

[0013] The target pressure value is obtained by calculating the sum of the current evaporation pressure, the first set threshold value, and half of the oscillation amplitude.

[0014] Optionally, before detecting that the oscillation amplitude of the pressure value on the high-pressure side of the system is greater than a preset amplitude, the method further includes:

[0015] A first pressure value is determined according to the current evaporation pressure and the first set threshold, and the outdoor fan is controlled to operate at a first target speed according to the first pressure value.

[0016] Optionally, confirming the first pressure value according to the current evaporation pressure and the first set threshold value includes:

[0017] The sum of the current evaporation pressure and the first set threshold is calculated to obtain the first pressure value.

[0018] Optionally, the method further includes:

[0019] Get the outdoor temperature;

[0020] When the outdoor temperature is within a preset temperature range and the rotation speed of the outdoor fan is greater than a preset rotation speed, a second pressure value is determined based on the first pressure value, and the second pressure value is greater than the first pressure value;

[0021] The external fan is controlled to operate at a second target speed according to the second pressure value.

[0022] Optionally, the method further includes:

[0023] After the external fan runs at the target speed for a predetermined period of time, obtaining an oscillation amplitude of a real-time system high-pressure side pressure value;

[0024] When it is detected that the oscillation amplitude of the real-time system high-pressure side pressure value is greater than the preset amplitude, triggering the step of confirming the target pressure value according to the current evaporation pressure, the first set threshold value and the oscillation amplitude;

[0025] When it is detected that the oscillation amplitude of the real-time system high-pressure side pressure value is not greater than the preset amplitude, the step of confirming the first pressure value according to the current evaporation pressure and the first set threshold is triggered.

[0026] In a second aspect, a control device for an external fan of an air conditioning system is provided, comprising:

[0027] A calculation module, configured to determine a target pressure value according to a current evaporation pressure, a first set threshold value and the oscillation amplitude when it is detected that the oscillation amplitude of the pressure value on the high-pressure side of the system is greater than a preset amplitude;

[0028] The control module is used to control the external fan to run at a target speed according to the target pressure value.

[0029] According to a third aspect, an electronic device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the first aspect and any possible implementation thereof.

[0030] In a fourth aspect, a computer storage medium is provided, wherein the computer storage medium stores one or more instructions, wherein the one or more instructions are suitable for being loaded by a processor and executing the steps of the above-mentioned first aspect and any possible implementation thereof.

[0031] The air-conditioning system outdoor fan control method in the present application, when it is detected that the oscillation amplitude of the system high-pressure side pressure value is greater than the preset amplitude, confirms the target pressure value according to the current evaporating pressure, the first set threshold value and the oscillation amplitude; controls the outdoor fan to operate at the target speed according to the target pressure value, adjusts the target pressure value for controlling the speed of the outdoor fan by monitoring the oscillation amplitude of the high-pressure side pressure, and controls the speed of the outdoor fan according to the target pressure value. Since the oscillation amplitude of the system high-pressure side pressure value is taken into account when calculating the target pressure value, the probability of periodic fluctuation of the high pressure can be reduced when the speed of the outdoor fan is controlled according to the target value, thereby improving the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0033] Figure 1 A flow chart of a method for controlling an external fan of an air-conditioning system provided in an embodiment of the present application;

[0034] Figure 2 A schematic diagram of the structure of a variable frequency computer room air conditioning system provided in an embodiment of the present application;

[0035] Figure 3 A schematic diagram of the structure of a long-pipe variable-frequency machine room air conditioning system provided in an embodiment of the present application;

[0036] Figure 4 A schematic diagram of the structure of an external fan control device for an air-conditioning system provided in an embodiment of the present application;

[0037] Figure 5 A schematic diagram of the structure of an electronic device provided in this application. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0039] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0042] See also Figure 1 , Figure 1 A flow chart of a method for controlling an external fan of an air conditioning system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the method includes:

[0043] 101. When it is detected that the oscillation amplitude of the pressure value on the high-pressure side of the system is greater than a preset amplitude, the target pressure value is confirmed according to the current evaporation pressure, the first set threshold value and the above oscillation amplitude;

[0044] 102. According to the above target pressure value, the external fan is controlled to run at a target speed.

[0045] The air conditioning system external fan control method in the embodiment of the present application can be applied to the air conditioning system, specifically a variable frequency machine room air conditioning system. The variable frequency machine room air conditioning system may include common components such as a compressor, a flow device, an external fan, etc., and the embodiment of the present application does not limit this. Among them, the system's software control process can be processed based on the control unit.

[0046] The compressor outlet side of the air conditioning system is usually called the high-pressure side, because the refrigerant is compressed by the compressor to form a high-temperature and high-pressure gas, and then becomes a high-pressure and low-temperature liquid after reaching the condenser, and then is reduced in pressure by the throttling element to become a low-temperature and low-pressure liquid, and then evaporated into a low-temperature and low-pressure gas in the evaporator, forming a cycle. Optionally, the high-pressure side pressure value of the above system in the embodiment of the present application can be obtained by collecting the sensor at the outlet of the condenser.

[0047] The high-pressure side of the air-conditioning system is prone to periodic fluctuations. The oscillation amplitude of the pressure value on the high-pressure side of the above system can be understood as the amplitude of periodic fluctuations, that is, the difference between the highest and lowest pressure values ​​of the pressure fluctuation on the high-pressure side of the system within a certain period.

[0048] In an optional implementation, before confirming the target pressure value according to the current evaporation pressure, the first set threshold value and the oscillation amplitude, the method further includes:

[0049] Obtaining the maximum pressure value and the minimum pressure value on the high pressure side of the above system within a preset period;

[0050] The oscillation amplitude of the pressure value on the high-pressure side of the system is calculated based on the maximum pressure value and the minimum pressure value on the high-pressure side of the system within the preset period.

[0051] The pressure value on the high-pressure side of the system may change in real time. The above-mentioned preset period can be set as needed, and the pressure value on the high-pressure side of the system can be monitored to obtain the maximum pressure value and the minimum pressure value on the high-pressure side of the system within the duration of the preset period, and calculate the difference between the maximum pressure value and the minimum pressure value to obtain the corresponding oscillation amplitude of the pressure value on the high-pressure side of the system.

[0052] Furthermore, when it is detected that the oscillation amplitude of the system high-pressure side pressure value is greater than a preset amplitude, the target pressure value can be confirmed based on the current evaporation pressure, the first set threshold and the oscillation amplitude for the speed control of the external fan.

[0053] Among them, the above-mentioned first set threshold is a parameter value set for calculating the target pressure value, which can be set as needed. It can be specifically determined based on the compression ratio, pressure difference and system pressure difference requirements of the compressor, and the embodiment of the present application does not impose any restrictions on this.

[0054] Optionally, there are two ways to obtain the current evaporation pressure:

[0055] The current evaporation pressure is determined according to the indoor return air temperature, or the current evaporation pressure is detected by a pressure sensor.

[0056] When the air conditioning system is started, the evaporation pressure will change dynamically until the air conditioning system runs stably and the evaporation pressure is fixed. Then, the current evaporation pressure can be determined by the current indoor return air temperature. Specifically, a temperature sensor can be set in the air conditioning system to detect the indoor return air temperature. In the embodiment of the present application, different evaporation pressures Pe can be set according to the indoor return air temperature, that is, the correspondence between the indoor return air temperature and the current evaporation pressure. After determining the current indoor return air temperature, the corresponding current evaporation pressure Pe can be determined.

[0057] Optionally, when the operating conditions of the air-conditioning system change, there will be errors in the determination of the indoor return air temperature, and the inlet pressure (inlet pressure) of the compressor is approximately equal to the evaporation pressure. Therefore, a pressure sensor set at the compressor inlet can be selected to measure the current evaporation pressure Pe in real time.

[0058] In an optional implementation manner, the target pressure value is determined based on the current evaporation pressure, the first set threshold value, and the oscillation amplitude, including:

[0059] The target pressure value is obtained by calculating the sum of the current evaporation pressure, the first set threshold value and half of the oscillation amplitude.

[0060] Specifically, the sum of the current evaporation pressure Pe, the first set threshold value A and half of the oscillation amplitude X can be calculated to obtain the target pressure value Pc, and the speed of the external fan can be controlled using the target pressure value Pc. The speed of the external fan corresponding to the target pressure value Pc is the target speed R. That is, it can be understood as: setting Pc = Pe + A + X / 2, thereby controlling the external fan to run at the target speed R corresponding to Pc.

[0061] Optionally, the weight parameter of the oscillation amplitude can be set as needed, such as 1 / 3, that is, setting Pc=Pe+A+X / 3, or other calculation methods can be used to introduce the influence of A and the oscillation amplitude. The embodiments of the present application are not limited to this.

[0062] Before confirming the target pressure value by monitoring the oscillation amplitude of the pressure value on the high-pressure side of the system, the external fan of the air-conditioning system may be controlled according to any control method, and the embodiment of the present application does not impose any limitation on this.

[0063] Optionally, before detecting that the oscillation amplitude of the pressure value on the high-pressure side of the system is greater than a preset amplitude, the method further includes:

[0064] 100. According to the current evaporation pressure and the first set threshold, a first pressure value is determined, and the external fan is controlled to operate at a first speed according to the first pressure value.

[0065] Further optionally, the determining the first pressure value according to the current evaporation pressure and the first set threshold value includes:

[0066] The sum of the current evaporation pressure and the first set threshold is calculated to obtain the first pressure value.

[0067] Specifically, the sum of the current evaporation pressure Pe and the first set threshold value A can be calculated to obtain the first pressure value Pc, so that the speed of the external fan is controlled using the first pressure value Pc, and the speed of the external fan corresponding to the first pressure value Pc is the first speed. That is, it can be understood as: setting Pc = Pe + A value, thereby controlling the external fan to run at the first speed corresponding to Pc.

[0068] After executing step 100, the external fan of the air-conditioning system is controlled according to Pc=Pe+A; then steps 101 and 102 can be executed, that is, when it is detected that the oscillation amplitude of the pressure value on the high-pressure side of the system is greater than the preset amplitude, the target pressure value can be confirmed based on the current evaporating pressure, the first set threshold value and the oscillation amplitude, and the external fan can be controlled to run at the target speed according to the target pressure value.

[0069] In an optional implementation, the above method further includes:

[0070] After the external fan runs at the target speed for a predetermined period of time, obtaining the oscillation amplitude of the real-time system high-pressure side pressure value;

[0071] When it is detected that the oscillation amplitude of the real-time system high-pressure side pressure value is greater than the preset amplitude, the step of confirming the target pressure value according to the current evaporation pressure, the first set threshold value and the oscillation amplitude is triggered;

[0072] When it is detected that the oscillation amplitude of the real-time system high-pressure side pressure value is not greater than the preset amplitude, the step of confirming the first pressure value according to the current evaporation pressure and the first set threshold is triggered.

[0073] Specifically, in the embodiment of the present application, the external fan control logic of step 101 and step 102 can be periodically executed. Through the above steps 101 and 102, after the target pressure value (set as P1) is confirmed according to the oscillation amplitude X1, the external fan is controlled to run at the target speed (set as R1) through the target pressure value P1; after a predetermined period of time, the real-time oscillation amplitude X2 of the system high-pressure side pressure value is obtained again to update the target pressure value (set as P2), and the external fan speed corresponding to P2 is R2, that is, the external fan is controlled to run at the new target speed R2 through the new target pressure value P2, so as to realize real-time regulation of the external fan speed.

[0074] The judgment on the oscillation amplitude of the system high-pressure side pressure value can also be performed periodically. When it is detected that the oscillation amplitude of the system high-pressure side pressure value is not greater than the preset amplitude, steps 101 and 102 may not be executed, and other external fan control logics may be executed, such as step 100: confirm the first pressure value through the previous evaporation pressure and the first set threshold, and control the external fan to run at a first speed according to the first pressure value.

[0075] In an optional implementation, the above method further includes:

[0076] 103. Get the outdoor temperature;

[0077] When the outdoor temperature is within a preset temperature range and the rotation speed of the outdoor fan is greater than a preset rotation speed, a second pressure value is determined based on the first pressure value, and the second pressure value is greater than the first pressure value;

[0078] 104. Control the external fan to operate at a second target speed according to the second pressure value.

[0079] Among them, step 100 can be executed first: confirm the first pressure value based on the current evaporation pressure and the first set threshold, and then execute step 103. Alternatively, step 103 can be executed first, and when it is determined that the outdoor temperature is within the preset temperature range and the speed of the outdoor fan is greater than the preset speed, the step of confirming the first pressure value is executed, and then the second pressure value is confirmed based on the first pressure value.

[0080] Specifically, an outdoor temperature sensor may be provided in the air conditioning system to collect the outdoor temperature. Based on the above embodiment, when it is detected that the outdoor temperature T is within the preset temperature range (such as satisfying T1≤T≤T2), and the current speed of the outdoor fan is greater than the preset speed (AA% speed), a different control logic may be adopted, that is, calculating the second pressure value to control the outdoor fan to run at the corresponding second speed through the second pressure value; optionally, in other cases, the following may be performed: Figure 1 Process flow in the illustrated embodiment.

[0081] Among them, the above-mentioned second pressure value can be obtained on the basis of the first pressure value. The specific calculation method of the second pressure value can be set as needed, such as setting a parameter value set for calculating the second pressure value (which can be a second set threshold). Optionally, a specific value can be added to the first pressure value, or the first pressure value can be adjusted by a weight parameter to obtain a relatively larger second pressure value, etc., which is not limited in the embodiments of the present application.

[0082] In an optional implementation, the determining the second pressure value based on the first pressure value includes:

[0083] The sum of the first pressure value and the second set threshold is calculated to obtain the second pressure value.

[0084] Specifically, the sum of the first target pressure and the second set threshold value may be calculated as the second target pressure. Assuming the first target pressure is Pc1 and the second set threshold value is N, the second target pressure is (Pc1+N).

[0085] Among them, the above-mentioned T1 and T2 can be adjusted according to the specific model, and the above-mentioned preset speed and the second set threshold N are also adjusted and set according to the specific external fan.

[0086] Since the power of the external fan is proportional to the cube of the speed of the external fan, when the speed of the external fan is higher than a certain speed, the increase in air volume is less than the increase in power. At this time, although increasing the speed of the external fan can reduce the speed of the compressor, the reduction is not as large as the increase in the power of the external fan. Therefore, in this case, in the embodiment of the present application, through the above steps, a higher external fan pressure setting value is adopted to control the external fan to achieve overall energy saving. Specifically, the variable frequency computer room air conditioning system in the embodiment of the present application can adopt different logics in different temperature zones. When T1≤T≤T2, the target pressure value for external fan control can be further increased to control the speed and power of the external fan to reduce and achieve overall energy saving.

[0087] In the embodiment of the present application, sensors in the system may be adjusted or increased as needed to achieve the required data collection and monitoring, so as to provide the data to the system or control unit for reasonable control, but the embodiment of the present application does not impose any restrictions on this.

[0088] See also Figure 2 , Figure 2 A schematic diagram of the structure of a variable frequency machine room air conditioning system provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the variable frequency machine room air conditioning system 200 includes:

[0089] Compressor 1, condenser 2, flow control device 3, evaporator 4, pressure sensor 5, wherein:

[0090] The outlet (exhaust port) of the compressor 1 is communicated with the inlet of the condenser 2, the outlet of the condenser 2 is communicated with the inlet of the flow regulating device 3, the outlet of the flow regulating device 3 is communicated with the inlet of the evaporator 4, and the outlet of the evaporator 4 is communicated with the inlet (intake port) of the compressor 1;

[0091] The pressure sensor 5 can be arranged at the outlet of the condenser 2 to collect the outlet pressure of the condenser 2, which can represent the pressure value of the high-pressure side of the system. Optionally, other sensors can be arranged to collect pressure or temperature data as needed.

[0092] Based on the above variable frequency machine room air conditioning system 200, the following operations can be performed: Figure 1 The method in the embodiment shown is not repeated here; accordingly, the variable frequency machine room air conditioning system 200 also includes an external fan, which can be Figure 1 The external fan control method of the air conditioning system in the illustrated embodiment is used for regulation.

[0093] Optionally, the variable frequency machine room air conditioning system 200 may further include a control unit, which may communicate with the pressure sensor 5 via a wired connection or a wireless connection, or may communicate with other units (such as the compressor 1, the condenser 2, etc.). Figure 2 The control unit is not marked. The control unit can be any type of controller or processor that can obtain information from other units and perform data processing and system control, including executing Figure 1 Any step of the method in the illustrated embodiment.

[0094] Optionally, the compressor in the embodiment of the present application may be a variable frequency compressor, such as a rotor compressor, a scroll compressor, a screw compressor or a centrifugal compressor, etc., and the embodiment of the present application is not limited to this.

[0095] In an optional embodiment, the outlet of the compressor 1 is connected to the inlet of the condenser 2 via a connecting air pipe, and the outlet of the condenser 2 is connected to the inlet of the flow regulating device 3 via a connecting liquid pipe.

[0096] For details, see Figure 3 The structure diagram of a long-pipe variable-frequency machine room air conditioning system is shown, wherein the variable-frequency machine room air conditioning system includes:

[0097] Compressor 1, condenser 2, flow regulating device 3, evaporator 4, pressure sensor 5, connecting gas pipe 6 and connecting liquid pipe 7. The control unit is not shown here, and the speed control of the external fan can be realized based on the system structure and the control unit.

[0098] The exhaust port of the compressor 1 is connected to the inlet of the condenser 2 through a long connecting air pipe 6, the outlet of the condenser 2 is connected to the inlet of the flow regulating device 3 through a long connecting liquid pipe 7, the outlet of the flow regulating device 3 is connected to the inlet of the evaporator 4, and the outlet of the evaporator 4 is connected to the suction port of the compressor 1; a pressure sensor 5 is arranged at the outlet of the condenser 2, which can be used to obtain the outlet pressure of the condenser 2 and represent the pressure value on the high-pressure side of the system.

[0099] Optionally, a pressure sensor can be set at the air inlet of the compressor in the system. When the operating conditions of the air conditioning system change, there will be errors in the determination of the indoor return air temperature, and the inlet pressure (inlet pressure) of the compressor is similar to the evaporation pressure. Therefore, the pressure sensor set at the air inlet of the compressor can be selected to measure the current evaporation pressure Pe in real time.

[0100] Optionally, the variable frequency computer room air conditioning system in the embodiment of the present application may also be configured with components such as an oil separator, a drying filter, a sight glass, and a gas-liquid separator according to actual conditions, which is not limited here.

[0101] The variable frequency machine room air conditioning system in the embodiment of the present application is combined with Figure 1 The control logic in the illustrated embodiment can reduce the probability of periodic fluctuations in high pressure and improve system stability by monitoring the oscillation amplitude of the high-pressure side pressure and adjusting the target pressure value used to control the rotation speed of the external fan.

[0102] For example, when the air conditioner is turned on, it generally takes a period of time t to start up, and the time t is generally 3 minutes. During the startup time, the speed of the outdoor fan can be adjusted according to the set value. When the system is started up and the compressor reaches the rated speed, the first outdoor fan control logic can be executed. For example: based on the current evaporation pressure and the first set threshold, the first pressure value is confirmed, and the outdoor fan is controlled to run at a first speed according to the first pressure value; assuming that specifically: the current indoor return air temperature is detected, such as 24±2℃, if the evaporation pressure Pe is 9bar, the A value can be 3, then Pc1=Pe1+A=9bar+3bar=12bar is calculated, and the speed of the external fan is controlled by Pc1=12bar. However, due to the long pipe and high drop system, the pipeline pressure loss of the computer room air conditioning system will be very large under this working condition. When 12bar control is used, the system high pressure will fluctuate periodically. For example, the height difference will fluctuate by 11bar to 14bar, and the oscillation amplitude X is 3bar. At this time, the control method can be modified to execute the second external fan control logic: when it is detected that the oscillation amplitude of the pressure value on the high-pressure side of the system is greater than the preset amplitude, the target pressure value is confirmed according to the current evaporation pressure, the first set threshold value and the oscillation amplitude; the external fan is controlled to run at the target speed according to the target pressure value; specifically, it can be controlled by: Pc2 = Pe1 + A + X / 2 = 9bar + 3bar + 1.5bar = 13.5bar, and the calculation control logic is checked every Δt, and Δt is 1min;

[0103] The above data are for example only, and various parameters and calculation formulas or thresholds may be adjusted according to actual conditions, and the embodiments of the present application do not limit this.

[0104] In an optional implementation, the second set threshold N has a value range of 1 to 2 bar.

[0105] The pressure setting value used by conventional variable frequency air conditioners to control the speed of the external fan is generally 18 to 21 bar, so the speed of the external fan is relatively low; while in the embodiment of the present application, through the above-mentioned calculation logic and setting a smaller first setting threshold A, a target pressure value relatively lower than the conventional setting value is determined to control the speed of the external fan, so the speed of the external fan is increased and the speed of the compressor is reduced; because the compressor power usually accounts for 60 to 70% of the power in an air-conditioning system, and the external fan power accounts for 10 to 25%, the energy efficiency of the whole machine will be greatly improved after the compressor speed is reduced, thereby achieving the purpose of energy saving.

[0106] In addition, when the system high pressure oscillates periodically and the oscillation amplitude exceeds the preset amplitude, the target pressure value used to control the external fan can be adaptively adjusted according to the oscillation amplitude, and the target pressure value can be increased to control the external fan to operate at the target speed, so as to relatively reduce the periodic fluctuations of the high pressure and improve the system stability.

[0107] In a certain temperature range, when T1≤T≤T2 is satisfied, generally between 5℃ and 20℃, the power of the external fan speed increase will be higher than the power of the compressor speed decrease. This is because the power of the external fan is proportional to the cube of the speed. Figure 2 In the method of the embodiment shown, within the temperature zone and the current external fan speed satisfies>AA% speed, for example, AA% is 80%, the external fan speed setting point is adjusted to (Pc+N), relative to Figure 1 In terms of the control logic of the illustrated embodiment, the pressure setting value used to control the speed of the external fan is appropriately increased through the second set threshold value N (it can be understood that the former increase is A, and the latter increase is A+N). In this case, a relatively higher external fan pressure setting value can be adopted to control the external fan, and then the speed and power of the external fan are appropriately reduced to achieve overall energy saving.

[0108] The above embodiments are for illustration only. In practical applications, the corresponding setting values ​​can be adjusted as needed, and the embodiments of the present application are not limited to this.

[0109] Based on the description of the above variable frequency air conditioning control method embodiment, the present application embodiment also discloses an air conditioning system external fan control device. Figure 4 As shown, the air conditioning system external fan control device 400 includes:

[0110] The calculation module 410 is used to determine the target pressure value according to the current evaporation pressure, the first set threshold value and the above oscillation amplitude when it is detected that the oscillation amplitude of the system high-pressure side pressure value is greater than the preset amplitude;

[0111] The control module 420 is used to control the external fan to run at a target speed according to the above target pressure value.

[0112] Optionally, the air conditioning system external fan control device 400 further includes an acquisition module 430, which is used to obtain the maximum pressure value and the minimum pressure value of the high pressure side of the above system within a preset period;

[0113] The calculation module 410 is further used to calculate the oscillation amplitude of the pressure value on the high-pressure side of the system according to the maximum pressure value and the minimum pressure value on the high-pressure side of the system within the preset period.

[0114] Optionally, the calculation module 410 is specifically used for:

[0115] The target pressure value is obtained by calculating the sum of the current evaporation pressure, the first set threshold value and half of the oscillation amplitude.

[0116] Optionally, the calculation module 410 is further used to confirm a first pressure value based on the current evaporation pressure and the first set threshold; the control module 420 is further used to control the external fan to operate at a first speed according to the first pressure value.

[0117] Optionally, the calculation module 410 is specifically used for:

[0118] The sum of the current evaporation pressure and the first set threshold is calculated to obtain the first pressure value.

[0119] Optionally, the acquisition module 430 is further used to acquire the outdoor temperature;

[0120] The calculation module 410 is further configured to determine a second pressure value based on the first pressure value when the outdoor temperature is within a preset temperature range and the rotation speed of the outdoor fan is greater than a preset rotation speed, and the second pressure value is greater than the first pressure value;

[0121] The control module 420 is further configured to control the external fan to operate at a second speed according to the second pressure value.

[0122] Optionally, the acquisition module 430 is further configured to acquire the oscillation amplitude of the real-time system high-pressure side pressure value after the external fan runs at the target speed for a predetermined period of time;

[0123] The calculation module 410 is further used for:

[0124] When it is detected that the oscillation amplitude of the real-time system high-pressure side pressure value is greater than the preset amplitude, the step of confirming the target pressure value according to the current evaporation pressure, the first set threshold value and the oscillation amplitude is triggered;

[0125] When it is detected that the oscillation amplitude of the real-time system high-pressure side pressure value is not greater than the preset amplitude, the step of confirming the first pressure value according to the current evaporation pressure and the first set threshold is triggered.

[0126] According to an embodiment of the present application, the above-mentioned air conditioning system external fan control device 400 can perform the above-mentioned Figure 1 The steps in the method embodiment shown are not repeated here.

[0127] Based on the description of the above method embodiment and device embodiment, the present application embodiment further provides an electronic device, which may be an electronic device of an air conditioning system, such as a variable frequency air conditioner. Figure 5 The electronic device 500 provided by the present application is a schematic diagram of the structure of an electronic device, the electronic device 500 may include a processor 501, an input / output device 502, a memory 503 and a computer storage medium. Among them, the various component units in the electronic device may be connected via a bus 504 or other means.

[0128] The computer storage medium can be stored in the memory 503 of the electronic device 500. The computer storage medium is used to store a computer program. The computer program includes program instructions. The processor 501 is used to execute the program instructions stored in the computer storage medium. The processor (or CPU (Central Processing Unit)) is the computing core and control core of the electronic device. It is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions to implement the corresponding method flow or corresponding function. In one embodiment, the processor 501 of the embodiment of the present application can be used to perform a series of processing, including such as Figure 1 The various steps involved in the method shown, etc.

[0129] The embodiment of the present application also provides a computer storage medium (Memory), which is a memory device in an electronic device for storing programs and data. It is understandable that the computer storage medium here can include both built-in storage media in electronic devices and, of course, extended storage media supported by electronic devices. The computer storage medium provides a storage space that stores the operating system of the electronic device. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer storage medium here can be a high-speed RAM memory, or a non-volatile memory, such as at least one disk storage; optionally, it can also be at least one computer storage medium located away from the aforementioned processor.

[0130] In one embodiment, one or more instructions stored in a computer storage medium may be loaded and executed by a processor to implement the corresponding steps in the above embodiment; in a specific implementation, one or more instructions in a computer storage medium may be loaded and executed by a processor as follows: Figure 1 The various steps involved in the method shown will not be repeated here.

[0131] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and modules can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0132] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the division of the module is only a logical function division, and there may be other division methods in actual implementation, for example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. The mutual coupling, direct coupling, or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0133] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0134] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a read-only memory (ROM), or a random access memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a tape, a magnetic disk, or an optical medium, such as a digital versatile disc (DVD), or a semiconductor medium, such as a solid state disk (SSD), etc.

Claims

1. A method for controlling an external fan of an air conditioning system, characterized in that: include: When it is detected that the oscillation amplitude of the pressure value on the high-pressure side of the system is greater than a preset amplitude, the target pressure value is confirmed according to the current evaporation pressure, the first set threshold value and the oscillation amplitude; The first set threshold is set for calculating the target pressure value, and is a parameter value determined based on the compression ratio and pressure difference of the compressor and the system pressure difference requirement; The determining the target pressure value according to the current evaporation pressure, the first set threshold value and the oscillation amplitude includes: calculating the sum of the current evaporation pressure, the first set threshold value and one half of the oscillation amplitude to obtain the target pressure value; The external fan is controlled to run at a target speed according to the target pressure value.

2. The method for controlling an external fan of an air conditioning system according to claim 1, characterized in that: Before confirming the target pressure value according to the current evaporation pressure, the first set threshold value and the oscillation amplitude, the method further includes: Obtaining the maximum pressure value and the minimum pressure value on the high pressure side of the system within a preset period; The oscillation amplitude of the pressure value on the high-pressure side of the system is calculated according to the maximum pressure value and the minimum pressure value on the high-pressure side of the system within the preset period.

3. The method for controlling an external fan of an air conditioning system according to claim 1, characterized in that: Before detecting that the oscillation amplitude of the pressure value on the high-pressure side of the system is greater than a preset amplitude, the method further includes: A first pressure value is determined according to the current evaporation pressure and the first set threshold, and the external fan is controlled to operate at a first speed according to the first pressure value.

4. The method for controlling an external fan of an air conditioning system according to claim 3, characterized in that: The step of confirming the first pressure value according to the current evaporation pressure and the first set threshold value includes: The sum of the current evaporation pressure and the first set threshold is calculated to obtain the first pressure value.

5. The method for controlling an external fan of an air conditioning system according to claim 3, characterized in that: The method further comprises: Get the outdoor temperature; When the outdoor temperature is within a preset temperature range and the rotation speed of the outdoor fan is greater than a preset rotation speed, a second pressure value is determined based on the first pressure value, the second pressure value is greater than the first pressure value, and the preset rotation speed is 80% of the rotation speed; The external fan is controlled to operate at a second speed according to the second pressure value.

6. The method according to claim 3, characterized in that: The method further comprises: After the external fan runs at the target speed for a predetermined period of time, obtaining an oscillation amplitude of a real-time system high-pressure side pressure value; When it is detected that the oscillation amplitude of the real-time system high-pressure side pressure value is greater than the preset amplitude, triggering the step of confirming the target pressure value according to the current evaporation pressure, the first set threshold value and the oscillation amplitude; When it is detected that the oscillation amplitude of the real-time system high-pressure side pressure value is not greater than the preset amplitude, the step of confirming the first pressure value according to the current evaporation pressure and the first set threshold is triggered.

7. An electronic device, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method for controlling an outdoor fan of an air-conditioning system as claimed in any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the processor executes the steps of the method for controlling an outdoor fan of an air-conditioning system according to any one of claims 1 to 6.

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