Fan control method and device, unit, electronic equipment and storage medium

Abstract

The invention discloses a fan control method and device, a unit, electronic equipment and a storage medium. The method comprises the steps that when the unit operates in a heating mode, the indoor air supply temperature is detected; according to the indoor air supply temperature, the target frequency of an outdoor fan is determined, and the target frequency enables the indoor air supply temperature not to exceed the preset maximum air supply temperature; and if the target frequency is larger than a preset frequency threshold value, the outdoor fan is allowed to be started, and the outdoor fan is controlled to operate according to the target frequency. The corresponding relation between the outdoor fan frequency and the indoor air supply temperature is established, the outdoor fan frequency is controlled according to the corresponding relation, and it can be guaranteed that the indoor side air supply temperature is not too high; only when the target frequency is larger than the preset frequency threshold value, the outdoor fan is allowed to be started, the allowance of unit pressure when the outdoor fan is started can be guaranteed, the probability of low-pressure protection is reduced, and the unit pressure is stabilized.

Description

Technical Field

[0001] This invention relates to the field of wind turbine control technology, and more specifically, to a wind turbine control method, device, unit, electronic equipment, and storage medium. Background Technology

[0002] Cold storage facilities are generally used for the low-temperature preservation and storage of goods. With the development of the times, the requirements for the functions of cold storage have increased. Cold storage facilities not only need to refrigerate to achieve the function of low-temperature preservation, but also need to heat to achieve the function of ripening or raising the temperature before leaving the storage. For example, heating can be used to ripen fruits and vegetables, or to raise the temperature before goods are taken out of the storage to avoid quality problems caused by excessive temperature difference when goods are transferred from a low-temperature environment to a normal temperature environment.

[0003] Currently, when cold storage facilities are heated, the outdoor fans are usually turned on to maximum. This can easily lead to unstable unit pressure or excessively high indoor air temperature. Unstable unit pressure may trigger low-pressure protection, and excessively high indoor air temperature may damage the quality of items in the cold storage (such as destroying vitamins and other nutrients in fruits and vegetables), thereby reducing the preservation effect of the items and affecting the user experience.

[0004] There is currently no effective solution to the problem of stabilizing unit pressure and avoiding excessively high indoor air supply temperature when cold storage units are heating. Summary of the Invention

[0005] This invention provides a fan control method, device, unit, electronic equipment, and storage medium to at least solve the problems of stabilizing unit pressure and avoiding excessively high indoor air supply temperature when a cold storage unit is heating.

[0006] To address the aforementioned technical problems, embodiments of the present invention provide a fan control method, comprising:

[0007] When the unit is in heating mode, monitor the indoor air supply temperature.

[0008] Based on the indoor air supply temperature, the target frequency of the outdoor fan is determined, wherein the target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature.

[0009] If the target frequency is greater than a preset frequency threshold, the outdoor fan is allowed to start, and the outdoor fan is controlled to operate at the target frequency.

[0010] Optionally, determining the target frequency of the outdoor fan based on the indoor air supply temperature includes:

[0011] Calculate the proportional coefficient based on the maximum allowable frequency of the fan, the minimum allowable frequency of the fan, the preset maximum air supply temperature, and the preset minimum air supply temperature;

[0012] The target frequency is calculated based on the minimum allowable frequency of the fan, the maximum supply air temperature, the indoor supply air temperature, and the proportionality coefficient.

[0013] Optionally, a proportionality coefficient is calculated based on the fan's maximum allowable frequency, minimum allowable frequency, preset maximum supply air temperature, and preset minimum supply air temperature, including:

[0014] The first difference is obtained by subtracting the minimum allowable frequency of the fan from the maximum allowable frequency of the fan.

[0015] The second difference is obtained by subtracting the minimum supply air temperature from the maximum supply air temperature.

[0016] The ratio of the first difference to the second difference is calculated to obtain the proportionality coefficient.

[0017] Optionally, the target frequency is calculated based on the minimum allowable frequency of the fan, the maximum supply air temperature, the indoor supply air temperature, and the proportionality coefficient, including:

[0018] The third difference is obtained by subtracting the maximum supply air temperature from the indoor supply air temperature.

[0019] Calculate the product of the proportional coefficient and the third difference, and subtract the product from the minimum allowable frequency of the wind turbine to obtain the target frequency.

[0020] Optionally, after calculating the target frequency, the method further includes:

[0021] If the calculated target frequency is greater than the maximum allowable frequency of the wind turbine, the maximum allowable frequency of the wind turbine shall be used as the final target frequency.

[0022] If the calculated target frequency is less than the minimum allowable frequency of the wind turbine, the minimum allowable frequency of the wind turbine shall be used as the final target frequency.

[0023] Optionally, after determining the target frequency of the outdoor fan based on the indoor air supply temperature, the method further includes:

[0024] If the target frequency is less than or equal to the preset frequency threshold, the outdoor fan is controlled to shut down.

[0025] Optionally, after controlling the outdoor fan to operate at the target frequency, the method further includes:

[0026] If the frequency of the outdoor fan is at the minimum allowable frequency for a continuous preset time, and the indoor air supply temperature is greater than the preset maximum air supply temperature, the outdoor fan will be shut down.

[0027] Optionally, the method further includes:

[0028] Detect the condensing temperature of the indoor heat exchanger;

[0029] If the condensation temperature is greater than or equal to the preset maximum condensation temperature, start the indoor fan;

[0030] If the condensation temperature is lower than the preset minimum condensation temperature, the indoor fan will be turned off.

[0031] If the condensing temperature is greater than or equal to the minimum condensing temperature and less than the maximum condensing temperature, the indoor fan is controlled to maintain its current state.

[0032] This invention also provides a fan control device, comprising:

[0033] The detection module is used to detect the indoor air supply temperature when the unit is in heating mode;

[0034] The determining module is used to determine the target frequency of the outdoor fan based on the indoor air supply temperature, wherein the target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature.

[0035] An outdoor fan control module is used to allow the outdoor fan to start when the target frequency is greater than a preset frequency threshold, and to control the outdoor fan to operate at the target frequency.

[0036] This invention also provides a unit, including: the fan control device described in this invention.

[0037] This invention also provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the wind turbine control method described in this invention.

[0038] This invention also provides a non-volatile computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the wind turbine control method described in this invention.

[0039] By applying the technical solution of this invention, during heating operation, the target frequency of the outdoor fan is determined based on the indoor air supply temperature. This target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature. During heating, the outdoor heat exchanger acts as an evaporator, and the frequency of the outdoor fan determines its heat absorption capacity. A higher outdoor fan frequency results in stronger heat absorption capacity, leading to a higher temperature in the indoor heat exchanger and consequently, a higher indoor air supply temperature. Therefore, establishing a correspondence between the outdoor fan frequency and the indoor air supply temperature, and controlling the outdoor fan frequency accordingly, ensures that the indoor air supply temperature does not become excessively high. The outdoor fan is only allowed to start when the target frequency exceeds a preset frequency threshold. Controlling the outdoor fan to operate at the target frequency ensures sufficient pressure margin in the unit when starting the outdoor fan, reduces the probability of low-pressure protection, and achieves the goal of stabilizing the unit pressure. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the heating operation of the cold storage unit provided in an embodiment of the present invention;

[0041] Figure 2 This is a flowchart of the fan control method provided in an embodiment of the present invention;

[0042] Figure 3 This is another flowchart of the fan control method provided in the embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the refrigeration unit provided in an embodiment of the present invention;

[0044] Figure 5 This is a structural block diagram of the fan control device provided in an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the hardware structure of the electronic device provided in an embodiment of the present invention;

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Compressor; 2. Four-way valve; 3. Outdoor heat exchanger; 4. Electronic expansion valve; 5. Indoor heat exchanger; 6. Liquid pipe shut-off valve; 7. Gas pipe shut-off valve.

[0048] Intake temperature sensor 11, low pressure sensor 12, exhaust temperature sensor 12, high pressure sensor 14;

[0049] Outdoor fan 31, outdoor heat exchanger temperature sensor 32, outdoor ambient temperature sensor 33;

[0050] Indoor fan 51, air supply temperature sensor 52, and warehouse temperature sensor 53. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0052] It should be noted that the terms "first," "second," etc., used in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0053] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0054] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0055] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0056] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0057] like Figure 1 The diagram shown is a schematic of the heating function of a cold storage unit. The cold storage unit mainly includes: compressor 1, four-way valve 2, outdoor heat exchanger 3, electronic expansion valve 4, and indoor heat exchanger 5. Figure 1 Only some core components of the cold storage unit are shown; conventional components such as gas-liquid separators, oil separators, check valves, and filters are not shown. Liquid line shut-off valve 6 and gas line shut-off valve 7 are used to control the opening and closing of the liquid and gas lines, respectively.

[0058] The compressor 1 is equipped with a suction temperature sensor 11 and a low pressure sensor 12 on the suction side. The suction temperature sensor 11 is used to detect the suction temperature of the cold storage unit, and the low pressure sensor 12 is used to detect the low pressure of the cold storage unit.

[0059] The compressor 1 is equipped with an exhaust temperature sensor 13 and a high pressure sensor 14 on the exhaust side. The exhaust temperature sensor 13 is used to detect the exhaust temperature of the cold storage unit, and the high pressure sensor 14 is used to detect the high pressure of the cold storage unit.

[0060] An outdoor fan 31 is installed at the outdoor heat exchanger 3 to drive outdoor air to exchange heat with the refrigerant in the outdoor heat exchanger 3.

[0061] At outdoor heat exchanger 3, an outdoor heat exchanger temperature sensor 32 is also installed to detect the pipe temperature of the outdoor heat exchanger. Specifically, when the cold storage unit is in heating mode, the outdoor heat exchanger 3 acts as an evaporator, and the outdoor heat exchanger temperature sensor 32 detects the evaporation temperature. When the cold storage unit is in cooling mode, the outdoor heat exchanger 3 acts as a condenser, and the outdoor heat exchanger temperature sensor 32 detects the condensation temperature.

[0062] An outdoor ambient temperature sensor 33 is also installed at the outdoor heat exchanger 3 to detect the outdoor ambient temperature.

[0063] An indoor fan 51 is installed at the indoor heat exchanger 5 to drive the indoor air (i.e., the air inside the cold storage) to exchange heat with the refrigerant inside the indoor heat exchanger 5.

[0064] An air supply temperature sensor 52 is also installed at the indoor heat exchanger 5 to detect the indoor air supply temperature.

[0065] At point 5 of the indoor heat exchanger, a temperature sensor 53 is also installed to detect the temperature inside the cold storage.

[0066] An indoor heat exchanger temperature sensor (not shown in the figure) is also installed at indoor heat exchanger 5 to detect the pipe temperature of the indoor heat exchanger. Specifically, when the cold storage unit is in heating mode, indoor heat exchanger 5 acts as a condenser, and the indoor heat exchanger temperature sensor detects the condensation temperature. When the cold storage unit is in cooling mode, indoor heat exchanger 5 acts as an evaporator, and the indoor heat exchanger temperature sensor detects the evaporation temperature.

[0067] When the cold storage unit is in heating mode, the compressor 1 discharges high-temperature and high-pressure gaseous refrigerant, which enters the indoor heat exchanger 5 (as a condenser) through the four-way valve 2. Driven by the indoor fan 51, the air in the cold storage exchanges heat with the refrigerant in the indoor heat exchanger 5, and the refrigerant condenses and dissipates heat, thereby increasing the air temperature in the cold storage. The refrigerant flowing out of the indoor heat exchanger 5 is throttled by the electronic expansion valve 4 and enters the outdoor heat exchanger 3 (as an evaporator). Driven by the outdoor fan 31, the outdoor air exchanges heat with the refrigerant in the outdoor heat exchanger 3, and the refrigerant absorbs heat and evaporates. The refrigerant flowing out of the outdoor heat exchanger 3 returns to the suction side of the compressor 1 through the four-way valve 2, completing one heating cycle.

[0068] Example 1

[0069] This embodiment provides a fan control method that can be applied to cold storage units.

[0070] Figure 2 This is a flowchart of the fan control method provided in an embodiment of the present invention, such as... Figure 2 As shown, the method includes the following steps:

[0071] S201, when the unit is in heating mode, the indoor air supply temperature is monitored.

[0072] S202, Based on the indoor air supply temperature, determine the target frequency of the outdoor fan, wherein the target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature.

[0073] S203, if the target frequency is greater than the preset frequency threshold, the outdoor fan is allowed to start, and the outdoor fan is controlled to operate at the target frequency.

[0074] The maximum air supply temperature can be set according to the actual situation. If the indoor air supply temperature exceeds the maximum air supply temperature, it will damage the quality of the items in the cold storage. For example, the maximum air supply temperature can be set to 50℃.

[0075] The outdoor fan start-up conditions during heating operation are set based on a preset frequency threshold. If the target frequency is greater than the preset frequency threshold, it means that the target frequency meets the outdoor fan start-up conditions during heating operation, and the outdoor fan is allowed to start.

[0076] The preset frequency threshold is within the allowable frequency range of the outdoor fan, meaning the preset frequency threshold is greater than or equal to the minimum allowable frequency of the fan and less than or equal to the maximum allowable frequency of the fan. For example, the preset frequency threshold can be obtained by testing in a lower outdoor ambient temperature range, such as an outdoor ambient temperature range below 5°C.

[0077] In practical applications, indoor air supply temperature can be detected and outdoor fan controlled in real time, or indoor air supply temperature can be detected and outdoor fan controlled periodically.

[0078] When cold storage units operate in heating conditions in low outdoor temperatures, the unit pressure is generally low. By setting the outdoor fan start conditions for heating operation as described above, the outdoor fan is only allowed to start when the target frequency exceeds a preset frequency threshold. In this case, the unit pressure will not be too low, preventing a rapid drop in unit pressure caused by the outdoor fan starting at a low frequency, which could trigger low-pressure protection. This embodiment of the outdoor fan control scheme for cold storage units during heating operation performs better in low outdoor temperatures.

[0079] In this embodiment, during heating operation, the target frequency of the outdoor fan is determined based on the indoor air supply temperature. This target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature. During heating, the outdoor heat exchanger acts as an evaporator, and the frequency of the outdoor fan determines its heat absorption capacity. A higher outdoor fan frequency results in stronger heat absorption, leading to a higher temperature in the indoor heat exchanger and consequently, a higher indoor air supply temperature. Therefore, establishing a correlation between the outdoor fan frequency and the indoor air supply temperature, and controlling the outdoor fan frequency accordingly, ensures that the indoor air supply temperature does not become excessively high. The outdoor fan is only allowed to start when the target frequency exceeds a preset frequency threshold. Controlling the outdoor fan to operate at the target frequency ensures sufficient pressure margin in the unit when starting the outdoor fan, reduces the probability of low-pressure protection, and stabilizes the unit pressure.

[0080] In one embodiment, determining the target frequency of the outdoor fan based on the indoor supply air temperature includes:

[0081] Calculate the proportional coefficient based on the maximum allowable frequency of the fan, the minimum allowable frequency of the fan, the preset maximum air supply temperature, and the preset minimum air supply temperature;

[0082] The target frequency is calculated based on the minimum allowable frequency of the fan, the maximum supply air temperature, the indoor supply air temperature, and the proportionality coefficient.

[0083] The maximum and minimum permissible frequencies of the outdoor fan constitute the permissible frequency range of the outdoor fan, which is set according to the actual situation of the outdoor fan.

[0084] The preset maximum and minimum air supply temperatures can be set according to the actual conditions of the cold storage.

[0085] This embodiment establishes the relationship between the outdoor fan frequency and the indoor air supply temperature through a proportionality coefficient. Based on the proportionality coefficient, the target frequency of the outdoor fan can be calculated reasonably and reliably, thereby effectively controlling the operation of the outdoor fan to stabilize the unit pressure and avoid excessively high indoor air supply temperature.

[0086] Furthermore, based on the fan's maximum allowable frequency, minimum allowable frequency, preset maximum supply air temperature, and preset minimum supply air temperature, a proportionality coefficient is calculated, including:

[0087] The first difference is obtained by subtracting the minimum allowable frequency of the fan from the maximum allowable frequency of the fan.

[0088] The second difference is obtained by subtracting the minimum supply air temperature from the maximum supply air temperature.

[0089] The ratio of the first difference to the second difference is calculated to obtain the proportionality coefficient.

[0090] This embodiment calculates a proportionality coefficient based on the difference between the maximum and minimum allowable frequency of the fan and the difference between the maximum and minimum supply air temperature, thereby enabling a reasonable construction of the relationship between the outdoor fan frequency and the indoor supply air temperature.

[0091] Furthermore, the target frequency is calculated based on the minimum allowable frequency of the fan, the maximum supply air temperature, the indoor supply air temperature, and the proportionality coefficient, including:

[0092] The third difference is obtained by subtracting the maximum supply air temperature from the indoor supply air temperature.

[0093] Calculate the product of the proportional coefficient and the third difference, and subtract the product from the minimum allowable frequency of the wind turbine to obtain the target frequency.

[0094] This embodiment can quickly calculate a suitable target frequency based on the minimum allowable frequency of the fan, the maximum supply air temperature, the indoor supply air temperature, and the proportional coefficient, so as to avoid the indoor supply air temperature being too high.

[0095] In one embodiment, after calculating the target frequency, the method further includes:

[0096] If the calculated target frequency is greater than the maximum allowable frequency of the wind turbine, the maximum allowable frequency of the wind turbine shall be used as the final target frequency.

[0097] If the calculated target frequency is less than the minimum allowable frequency of the wind turbine, the minimum allowable frequency of the wind turbine shall be used as the final target frequency.

[0098] This embodiment ensures that the actual operating frequency of the outdoor fan does not exceed the allowable range by limiting the maximum and minimum allowable frequencies of the fan, thus guaranteeing the normal operation of the entire unit.

[0099] For example, the outdoor fan of a cold storage unit generally uses a variable frequency motor. The allowable frequency range of the outdoor fan is [f(l), f(h)], where f(l) represents the minimum allowable frequency of the fan and f(h) represents the maximum allowable frequency of the fan. f(l) and f(h) can be set according to the actual situation of the outdoor fan. For example, f(l) = 60Hz and f(h) = 8Hz.

[0100] Ts represents the actual measured indoor air supply temperature; Tsmax represents the preset maximum air supply temperature, for example, Tsmax is 50℃; Tsmin represents the preset minimum air supply temperature, for example, Tsmin is 5℃.

[0101] The operating frequency of the outdoor fan is adjusted according to the changes in the indoor supply air temperature during the heating operation of the cold storage unit, as follows:

[0102] The outdoor fan is controlled according to period t. In the nth period, the target frequency f(n) of the outdoor fan is calculated as follows:

[0103] f(n) = f(l) - K1×(Ts-Tsmax),

[0104] Where K1 represents the proportionality coefficient, K1=[f(h)-f(l)] / (Tsmax-Tsmin).

[0105] If f(n) > f(h), then by assigning a value, f(n) = f(h).

[0106] If f(n) < f(l), then by assigning a value, f(n) = f(l).

[0107] In one embodiment, after determining the target frequency of the outdoor fan based on the indoor air supply temperature, the method further includes: if the target frequency is less than or equal to the preset frequency threshold, it indicates that the target frequency does not meet the fan start-up conditions, and in this case, the outdoor fan is not allowed to be started, and the outdoor fan is controlled to be shut down.

[0108] In other words, if the target frequency is less than or equal to the preset frequency threshold, the outdoor fan will remain off if it is currently off, and will be turned off if it is currently on.

[0109] In this embodiment, the outdoor fan is not allowed to start when the target frequency is less than or equal to the preset frequency threshold. This avoids the situation where the outdoor fan starts at a low frequency, causing the unit pressure to drop rapidly and triggering the low-pressure protection, thereby reducing the probability of low-pressure protection and stabilizing the unit pressure.

[0110] like Figure 3 The diagram shown is another flowchart of a wind turbine control method, which includes the following steps:

[0111] S301, when the unit is in heating mode, the indoor air supply temperature is monitored.

[0112] S302, determine the target frequency of the outdoor fan based on the indoor air supply temperature, wherein the target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature.

[0113] S303, if the target frequency is greater than the preset frequency threshold, the outdoor fan is allowed to start, and the outdoor fan is controlled to operate at the target frequency.

[0114] S304, if the target frequency is less than or equal to the preset frequency threshold, control the outdoor fan to shut down.

[0115] In one embodiment, after controlling the outdoor fan to operate at the target frequency, the method further includes: if the frequency of the outdoor fan is the minimum allowable frequency of the fan for a continuous preset time, and the indoor air supply temperature is greater than the preset maximum air supply temperature, controlling the outdoor fan to shut down.

[0116] The preset time can be set according to the actual situation, for example, it can be set directly to 40s, or N periods t.

[0117] In this embodiment, if it is detected that the frequency of the outdoor fan is at the minimum allowable frequency for a continuous preset time and the indoor air supply temperature is greater than the preset maximum air supply temperature during the operation of the outdoor fan, it is determined that the outdoor fan must be shut down at this time. Shutting down the outdoor fan at this time can prevent the indoor air supply temperature from continuing to rise and avoid large fluctuations in unit pressure caused by frequent start-up and shutdown of the outdoor fan.

[0118] While controlling the outdoor fan based on the indoor air supply temperature, it is also necessary to control the indoor fan to ensure that the unit pressure is within a stable range during heating.

[0119] The indoor fans of cold storage units generally use fixed-frequency motors. Specifically, the methods mentioned above also include:

[0120] Detect the condensing temperature of the indoor heat exchanger;

[0121] If the condensation temperature is greater than or equal to the preset maximum condensation temperature, start the indoor fan;

[0122] If the condensation temperature is lower than the preset minimum condensation temperature, the indoor fan will be turned off.

[0123] If the condensing temperature is greater than or equal to the minimum condensing temperature and less than the maximum condensing temperature, the indoor fan is controlled to maintain its current state.

[0124] The preset maximum and minimum condensing temperatures are set based on the actual conditions of the indoor heat exchanger.

[0125] The condensation temperature refers to the high-pressure saturation temperature of the condenser. The condensation temperature directly reflects the heat exchange temperature difference of the heat exchanger in relation to the ambient temperature of the heat exchanger.

[0126] When the cold storage unit is in heating mode, the indoor heat exchanger acts as the condenser. If the indoor fan is not turned on, the heat from the refrigerant inside the heat exchanger cannot be effectively dissipated and will accumulate in the condenser, causing the condensing temperature to rise. When the actual condensing temperature of the indoor heat exchanger is greater than or equal to the preset maximum condensing temperature, the indoor fan is turned on. The condensing temperature will then gradually decrease, and the indoor fan will remain on. When the actual condensing temperature of the indoor heat exchanger is less than the preset minimum condensing temperature, the indoor fan is turned off. After the indoor fan is turned off, the actual condensing temperature of the indoor heat exchanger will gradually rise. When it reaches or equals the preset maximum condensing temperature, the indoor fan is turned on again, and this cycle of fan control continues. Ultimately, this stabilizes the actual condensing temperature of the indoor heat exchanger within a reasonable range. Since the condensing temperature is positively correlated with the unit's condensing pressure, the unit pressure can be stabilized through the above-described control of the indoor fan.

[0127] In this embodiment, during heating, the indoor fan is controlled based on the condensing temperature of the indoor heat exchanger. Through coordinated control of the outdoor and indoor fans, the unit pressure can be effectively stabilized while avoiding excessively high indoor air supply temperature.

[0128] For example, Tf represents the condensing temperature of the indoor heat exchanger (which can be obtained by detecting its pipe temperature), Tcrmax represents the preset maximum condensing temperature, and Tcrmin represents the preset minimum condensing temperature.

[0129] When Tf ≥ Tcrmax, start the indoor fan;

[0130] When Tf < Tcrmin, turn off the indoor fan;

[0131] When Tcrmin≤Tf<Tcrmax, the indoor fan remains in its current state.

[0132] Example 2

[0133] This embodiment provides a control method for a cold storage unit during refrigeration operation.

[0134] like Figure 4 The diagram shows a schematic of the refrigeration operation of a cold storage unit. During operation, the compressor 1 discharges high-temperature, high-pressure gaseous refrigerant, which enters the outdoor heat exchanger 3 (as a condenser) through the four-way valve 2. Driven by the outdoor fan 31, the outdoor air exchanges heat with the refrigerant in the outdoor heat exchanger 3, causing the refrigerant to condense and dissipate heat. The refrigerant flowing out of the outdoor heat exchanger 3 is throttled by the electronic expansion valve 4 and enters the indoor heat exchanger 5 (as an evaporator). Driven by the indoor fan 51, the air inside the cold storage exchanges heat with the refrigerant in the indoor heat exchanger 5, causing the refrigerant to absorb heat and evaporate, thus cooling the air inside the cold storage. The refrigerant flowing out of the indoor heat exchanger 5 returns to the suction side of the compressor 1 through the four-way valve 2, completing one refrigeration cycle.

[0135] When a cold storage unit is running, the temperature inside the cold storage is relatively low, resulting in low pressure within the unit. In winter, when the outdoor ambient temperature is low, both the internal and external temperatures of the cold storage unit are very low, causing the unit pressure to drop below the compressor's operating range, triggering low-pressure protection. Currently, cold storage units have a certain probability of triggering low-pressure protection during winter cooling, which reduces the preservation effect of goods and affects the user experience.

[0136] This embodiment divides the outdoor ambient temperature into temperature ranges, with different temperature ranges corresponding to different outdoor fan start-up conditions, so as to control the outdoor fan based on the outdoor ambient temperature during the refrigeration operation of the cold storage unit.

[0137] For example, the outdoor ambient temperature is divided into three temperature ranges, denoted as high temperature range, medium temperature range and low temperature range, and corresponding outdoor fan start-up conditions are set for each of the three temperature ranges. Specifically, the outdoor fan start-up frequency threshold for the high temperature range is f(g), the outdoor fan start-up frequency threshold for the medium temperature range is f(z), and the outdoor fan start-up frequency threshold for the low temperature range is f(d).

[0138] f(g) > f(z) > f(d), for example, f(g) = 30Hz, f(z) = 20Hz, f(d) = 10Hz. The values ​​of f(g), f(z), and f(d) are within the allowable frequency range of the fan. Specifically, f(g), f(z), and f(d) can be obtained experimentally within the corresponding temperature range.

[0139] When a cold storage unit is operating in refrigeration mode, the outdoor fan start-up conditions are as follows:

[0140] In the high-temperature range, if the target frequency of the outdoor fan is greater than f(g), it means that the outdoor fan start-up conditions are met, the outdoor fan is allowed to start, and the outdoor fan is controlled to operate at the target frequency.

[0141] In the medium temperature range, if the target frequency of the outdoor fan is greater than f(z), it means that the outdoor fan start-up conditions are met, the outdoor fan is allowed to start, and the outdoor fan is controlled to operate at the target frequency.

[0142] In the low-temperature range, if the target frequency of the outdoor fan is greater than f(d), it means that the outdoor fan start-up conditions are met, the outdoor fan is allowed to start, and the outdoor fan is controlled to operate at the target frequency.

[0143] In this embodiment, the outdoor fan is controlled as follows during the refrigeration operation of the cold storage unit:

[0144] S1, when the unit is running in cooling mode, detect the outdoor ambient temperature Te and the condensing temperature Tc of the outdoor heat exchanger.

[0145] S2. Determine the target frequency f(n) of the outdoor fan based on the condensing temperature Tc of the outdoor heat exchanger.

[0146] S3. Based on the outdoor ambient temperature Te, determine whether the target frequency meets the corresponding outdoor fan start-up conditions. If the outdoor fan start-up conditions are met, allow the outdoor fan to start and control the outdoor fan to operate at the target frequency; if the outdoor fan start-up conditions are not met, do not allow the outdoor fan to start and control the outdoor fan to shut down.

[0147] In step S2, the refrigeration proportional coefficient K2 is first calculated according to the following formula:

[0148] K2 = [f(h)-f(l)] / (Tcmax-Tcmin),

[0149] Where f(l) represents the minimum allowable frequency of the fan, f(h) represents the maximum allowable frequency of the fan, and [f(l), f(h)] constitutes the allowable frequency range of the outdoor fan. f(l) and f(h) can be set according to the actual situation of the outdoor fan, for example, f(l) = 60Hz, f(h) = 8Hz; Tcmax represents the preset maximum condensing temperature of the outdoor heat exchanger, for example, a value of 55℃, and Tcmin represents the preset minimum condensing temperature of the outdoor heat exchanger, for example, a value of 15℃.

[0150] Then calculate the target frequency f(n) of the outdoor fan during cooling using the following formula:

[0151] f(n) = f(l) + K2×(Tc - Tcmin).

[0152] If f(n) > f(h), then by assigning a value, f(n) = f(h) to ensure that the operating frequency of the outdoor fan does not exceed the allowable range.

[0153] If f(n) < f(l), then by assigning a value, f(n) = f(l) to ensure that the operating frequency of the outdoor fan does not exceed the allowable range.

[0154] In step S3:

[0155] If Te > Temax (i.e., the current outdoor ambient temperature is in the high temperature range) and f(n) > f(g), the outdoor fan is allowed to start, and the outdoor fan is controlled to run at the target frequency f(n);

[0156] If Temin≤Te≤Temax (i.e., the current outdoor ambient temperature is in the medium temperature range) and f(n)>f(z), the outdoor fan is allowed to start, and the outdoor fan is controlled to run at the target frequency f(n);

[0157] If Te < Temin (i.e., the current outdoor ambient temperature is in the low temperature range) and f(n) > f(d), the outdoor fan is allowed to start and is controlled to run at the target frequency f(n).

[0158] Temin represents the preset first ambient temperature threshold, for example, a value of 5℃, and Temax represents the preset second ambient temperature threshold, for example, a value of 40℃. Temin and Temax are used to divide temperature ranges.

[0159] In this embodiment, the outdoor fan is controlled in segments based on the outdoor ambient temperature during cooling operation. Under different outdoor ambient temperature ranges, the outdoor fan is controlled to start at different fan start frequency thresholds. In high-temperature outdoor environments, the outdoor fan can be started at a high frequency to quickly stabilize the high pressure. In low-temperature outdoor environments, the outdoor fan is restricted from starting at a low frequency to ensure the unit pressure margin when starting the outdoor fan, reduce the probability of low-pressure protection, and ensure the pressure stability of the unit during cooling operation, especially in low-temperature outdoor environments where the unit can operate stably.

[0160] During the refrigeration operation of the cold storage unit, after controlling the outdoor fan to operate at the target frequency, if the frequency of the outdoor fan is the minimum allowable frequency of the fan for a continuous preset time, and Tc < Tcmin, then the outdoor fan is turned off.

[0161] The preset time can be set according to the actual situation, for example, it can be set directly to 40s, or N periods t.

[0162] In this embodiment, during the cooling process, if it is detected that the frequency of the outdoor fan is consistently at the minimum allowable frequency and Tc < Tcmin for a preset period of time, it is determined that the outdoor fan must be shut down. This shutdown of the outdoor fan avoids large pressure fluctuations in the unit caused by frequent starting and stopping of the outdoor fan.

[0163] If the outdoor ambient temperature sensor malfunctions, the outdoor ambient temperature is no longer considered when determining whether the target frequency meets the outdoor fan start-up conditions. If f(n) > f_d, the outdoor fan is allowed to start and is controlled to operate at the target frequency; if f(n) ≤ f_d, the outdoor fan is not allowed to start, i.e., it is shut down. For example, f_d = 0.5 × f(h). Therefore, even when the cold storage unit is operating in refrigeration mode and the outdoor ambient temperature sensor malfunctions, effective control of the outdoor fan can still be guaranteed.

[0164] During the refrigeration operation of the cold storage unit, while controlling the outdoor fan through the above-mentioned methods, the electronic expansion valve can also be controlled in two stages. If the current low pressure is less than or equal to the preset low pressure threshold, it enters the low pressure protection stage; if the current low pressure is greater than the preset low pressure threshold, it enters the superheat closed-loop stage.

[0165] The preset low-pressure threshold is the low-pressure protection value of the cold storage unit, which can be set according to the actual situation, for example, a value of 0.144MPa.

[0166] (1) Low-voltage protection stage

[0167] When the current low pressure is less than or equal to the preset low pressure threshold, open the electronic expansion valve to its maximum opening.

[0168] The occurrence of low-pressure protection indicates that there is insufficient gaseous refrigerant on the low-pressure side of the unit. By opening the electronic expansion valve to its maximum opening, more refrigerant can enter the low-pressure side, accelerating pressure balance and reaching the compressor's operating pressure range, thus quickly deactivating the low-pressure protection.

[0169] (2) Superheat closed-loop stage

[0170] When the current low pressure is greater than the preset low pressure threshold, the opening of the electronic expansion valve is controlled according to the intake superheat. The specific steps are as follows:

[0171] Obtain the inhalation superheat Sh;

[0172] If Sh < 1℃, reduce the opening of the electronic expansion valve to reduce the refrigerant flow, allowing the refrigerant in the evaporator to fully absorb heat and evaporate, reducing liquid carryover during suction, and avoiding damage to the compressor;

[0173] If Sh > 2℃, increase the opening of the electronic expansion valve to increase the refrigerant flow, allowing more refrigerant to evaporate in the evaporator and preventing overheating;

[0174] If 1℃≤Sh≤2℃, keep the current opening of the electronic expansion valve unchanged.

[0175] Specifically, the opening of the electronic expansion valve can be adjusted according to a preset step size to avoid oscillation.

[0176] Example 3

[0177] Based on the same inventive concept, this embodiment provides a fan control device that can be used to implement the fan control method described in the above embodiments. This fan control device can be implemented through software and / or hardware, and it is generally integrated into the controller of a unit, such as the controller of a cold storage unit.

[0178] Figure 5 This is a structural block diagram of the fan control device provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the fan control device includes:

[0179] Detection module 51 is used to detect the indoor air supply temperature when the unit is in heating mode;

[0180] The determining module 52 is used to determine the target frequency of the outdoor fan based on the indoor air supply temperature, wherein the target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature.

[0181] The outdoor fan control module 53 is used to allow the outdoor fan to start when the target frequency is greater than a preset frequency threshold, and to control the outdoor fan to operate at the target frequency.

[0182] In this embodiment, during heating operation, the target frequency of the outdoor fan is determined based on the indoor air supply temperature. This target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature. During heating, the outdoor heat exchanger acts as an evaporator, and the frequency of the outdoor fan determines its heat absorption capacity. A higher outdoor fan frequency results in stronger heat absorption, leading to a higher temperature in the indoor heat exchanger and consequently, a higher indoor air supply temperature. Therefore, establishing a correlation between the outdoor fan frequency and the indoor air supply temperature, and controlling the outdoor fan frequency accordingly, ensures that the indoor air supply temperature does not become excessively high. The outdoor fan is only allowed to start when the target frequency exceeds a preset frequency threshold. Controlling the outdoor fan to operate at the target frequency ensures sufficient pressure margin in the unit when starting the outdoor fan, reduces the probability of low-pressure protection, and stabilizes the unit pressure.

[0183] Optionally, the determining module 52 includes:

[0184] The first calculation unit is used to calculate the proportional coefficient based on the maximum allowable frequency of the fan, the minimum allowable frequency of the fan, the preset maximum air supply temperature, and the preset minimum air supply temperature.

[0185] The second calculation unit is used to calculate the target frequency based on the minimum allowable frequency of the fan, the maximum supply air temperature, the indoor supply air temperature, and the proportional coefficient.

[0186] Optionally, the first computing unit includes:

[0187] The first calculation subunit is used to calculate the maximum allowable frequency of the fan minus the minimum allowable frequency of the fan to obtain a first difference value;

[0188] The second calculation subunit is used to calculate the maximum supply air temperature minus the minimum supply air temperature to obtain a second difference value;

[0189] The third calculation subunit is used to calculate the ratio of the first difference to the second difference to obtain the proportionality coefficient.

[0190] Optionally, the second computing unit includes:

[0191] The fourth calculation subunit is used to calculate the indoor supply air temperature minus the maximum supply air temperature to obtain the third difference;

[0192] The fifth calculation subunit is used to calculate the product of the proportional coefficient and the third difference, and to calculate the minimum allowable frequency of the wind turbine minus the product to obtain the target frequency.

[0193] Optionally, the determining module 52 further includes:

[0194] The determining unit is configured to, after calculating the target frequency, if the calculated target frequency is greater than the maximum allowable frequency of the wind turbine, use the maximum allowable frequency of the wind turbine as the final target frequency; and if the calculated target frequency is less than the minimum allowable frequency of the wind turbine, use the minimum allowable frequency of the wind turbine as the final target frequency.

[0195] Optionally, the fan control device further includes:

[0196] The first control module is used to control the outdoor fan to shut down if the target frequency is less than or equal to the preset frequency threshold after determining the target frequency of the outdoor fan based on the indoor air supply temperature.

[0197] Optionally, the fan control device further includes:

[0198] The second control module is used to control the outdoor fan to shut down if, after controlling the outdoor fan to operate at the target frequency, the frequency of the outdoor fan is the minimum allowable frequency for a continuous preset time, and the indoor air supply temperature is greater than the preset maximum air supply temperature.

[0199] Optionally, the fan control device further includes:

[0200] Temperature detection module is used to detect the condensing temperature of the indoor heat exchanger;

[0201] An indoor fan control module is configured to start the indoor fan if the condensing temperature is greater than or equal to a preset maximum condensing temperature; turn off the indoor fan if the condensing temperature is less than a preset minimum condensing temperature; and control the indoor fan to maintain its current state if the condensing temperature is greater than or equal to the minimum condensing temperature and less than the maximum condensing temperature.

[0202] The aforementioned fan control device can execute the fan control method provided in the above embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the fan control method. Technical details not described in detail in this embodiment can be found in the fan control method provided in the embodiments of the present invention.

[0203] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0204] Example 4

[0205] This embodiment provides a unit, including: the fan control device described in the above embodiment.

[0206] In this embodiment, during heating operation, the target frequency of the outdoor fan is determined based on the indoor air supply temperature. This target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature. During heating, the outdoor heat exchanger acts as an evaporator, and the frequency of the outdoor fan determines its heat absorption capacity. A higher outdoor fan frequency results in stronger heat absorption, leading to a higher temperature in the indoor heat exchanger and consequently, a higher indoor air supply temperature. Therefore, establishing a correlation between the outdoor fan frequency and the indoor air supply temperature, and controlling the outdoor fan frequency accordingly, ensures that the indoor air supply temperature does not become excessively high. The outdoor fan is only allowed to start when the target frequency exceeds a preset frequency threshold. Controlling the outdoor fan to operate at the target frequency ensures sufficient pressure margin in the unit when starting the outdoor fan, reduces the probability of low-pressure protection, and stabilizes the unit pressure.

[0207] Example 5

[0208] This embodiment provides a non-volatile computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the wind turbine control method described in the above embodiment.

[0209] Example 6

[0210] This embodiment provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the wind turbine control method described in the above embodiment.

[0211] Figure 6 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of the present invention, such as... Figure 6 As shown, the electronic device includes:

[0212] One or more processors 610 and memory 620, Figure 6 Take the 610 processor as an example.

[0213] The electronic device may also include an input device 630 and an output device 640.

[0214] The processor 610, memory 620, input device 630, and output device 640 can be connected via a bus or other means. Figure 6 Taking the example of a connection between China and Israel via a bus.

[0215] The memory 620, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the wind turbine control method in this embodiment of the invention. The processor 610 executes various functional applications and data processing by running the non-volatile software programs, instructions, and modules stored in the memory 620, thereby realizing the aforementioned wind turbine control method.

[0216] The memory 620 may include a program storage area and a data storage area. The program storage area may store the application program required for the operating device and at least one function. The data storage area may store preset thresholds, unit operating data, etc. In addition, the memory 620 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0217] Input device 630 can receive input digital or character information, and generate key signal inputs related to user settings and function control of the electronic device. Output device 640 may include display devices such as a display screen.

[0218] The one or more modules are stored in the memory 620, and when executed by the one or more processors 610, the above-described wind turbine control method is performed.

[0219] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0220] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fan control method, characterized in that, include: When the unit is in heating mode, monitor the indoor air supply temperature. Based on the indoor air supply temperature, the target frequency of the outdoor fan is determined, wherein the target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature. If the target frequency is greater than a preset frequency threshold, the outdoor fan is allowed to start, and the outdoor fan is controlled to operate at the target frequency.

2. The method according to claim 1, characterized in that, Based on the indoor air supply temperature, determine the target frequency of the outdoor fan, including: Calculate the proportional coefficient based on the maximum allowable frequency of the fan, the minimum allowable frequency of the fan, the preset maximum air supply temperature, and the preset minimum air supply temperature; The target frequency is calculated based on the minimum allowable frequency of the fan, the maximum supply air temperature, the indoor supply air temperature, and the proportionality coefficient.

3. The method according to claim 2, characterized in that, Calculate the proportional coefficient based on the fan's maximum allowable frequency, minimum allowable frequency, preset maximum supply air temperature, and preset minimum supply air temperature, including: The first difference is obtained by subtracting the minimum allowable frequency of the fan from the maximum allowable frequency of the fan. The second difference is obtained by subtracting the minimum supply air temperature from the maximum supply air temperature. The ratio of the first difference to the second difference is calculated to obtain the proportionality coefficient.

4. The method according to claim 2, characterized in that, The target frequency is calculated based on the minimum allowable frequency of the fan, the maximum supply air temperature, the indoor supply air temperature, and the proportional coefficient, including: The third difference is obtained by subtracting the maximum supply air temperature from the indoor supply air temperature. Calculate the product of the proportional coefficient and the third difference, and subtract the product from the minimum allowable frequency of the wind turbine to obtain the target frequency.

5. The method according to claim 2, characterized in that, After calculating the target frequency, the method further includes: If the calculated target frequency is greater than the maximum allowable frequency of the wind turbine, the maximum allowable frequency of the wind turbine shall be used as the final target frequency. If the calculated target frequency is less than the minimum allowable frequency of the wind turbine, the minimum allowable frequency of the wind turbine shall be used as the final target frequency.

6. The method according to claim 1, characterized in that, After determining the target frequency of the outdoor fan based on the indoor air supply temperature, the method further includes: If the target frequency is less than or equal to the preset frequency threshold, the outdoor fan is controlled to shut down.

7. The method according to claim 1, characterized in that, After controlling the outdoor fan to operate at the target frequency, the method further includes: If the frequency of the outdoor fan is at the minimum allowable frequency for a continuous preset time, and the indoor air supply temperature is greater than the preset maximum air supply temperature, the outdoor fan will be shut down.

8. The method according to any one of claims 1 to 7, characterized in that, The method further includes: Detect the condensing temperature of the indoor heat exchanger; If the condensation temperature is greater than or equal to the preset maximum condensation temperature, start the indoor fan; If the condensation temperature is lower than the preset minimum condensation temperature, the indoor fan will be turned off. If the condensing temperature is greater than or equal to the minimum condensing temperature and less than the maximum condensing temperature, the indoor fan is controlled to maintain its current state.

9. A fan control device, characterized in that, include: The detection module is used to detect the indoor air supply temperature when the unit is in heating mode; The determining module is used to determine the target frequency of the outdoor fan based on the indoor air supply temperature, wherein the target frequency ensures that the indoor air supply temperature does not exceed the preset maximum air supply temperature. An outdoor fan control module is used to allow the outdoor fan to start when the target frequency is greater than a preset frequency threshold, and to control the outdoor fan to operate at the target frequency.

10. A generator unit, characterized in that, include: The fan control device according to claim 9.

11. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the steps of the wind turbine control method according to any one of claims 1 to 8.

12. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the wind turbine control method according to any one of claims 1 to 8.

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