An air conditioner

Abstract

The application discloses an air conditioner, which comprises an outdoor unit; the outdoor unit is top air outlet, comprising a plurality of fans, a wind volume detection module, a plurality of current detection modules, a rotating speed detection and control module; each current detection module is used for detecting the operating current of each fan; the wind volume detection module is used for detecting the top air volume of the outdoor unit; the rotating speed detection and control module is configured with a unit rated air volume and a current limit value of the fan, and is connected with each fan, each current detection module and the wind volume detection module, respectively, and real-time receives each operating current and the top air volume, and controls the operation of each fan according to the unit rated air volume, the current limit value, each operating current and the top air volume, respectively. The application improves the uniformity of air outlet and the balance of each operating current by controlling the operation of the fan, and further improves the reliability of the unit operation.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically to an air conditioner. Background Technology

[0002] Top-discharge outdoor units exhaust hot air, after passing through the condenser, upwards through a top duct, without affecting surrounding usable space, making them more convenient to use. Furthermore, because top-discharge outdoor units require a change in duct direction and the condenser is positioned vertically within the duct, their height effectively reduces the safety risks associated with ground-mounted installations, increasing space safety.

[0003] However, top-discharge outdoor units have a longer duct than side-discharge outdoor units, resulting in weaker resistance to external static pressure. This leads to lower airflow and reduced capacity under high external static pressure conditions. High static pressure top-discharge units are primarily designed for special off-site installation scenarios, such as installations in confined spaces, locations with obstructed airflow, or irregularly shaped external ducts causing uneven static pressure resistance. These conditions can lead to poor unit performance, uneven airflow and current between the left and right fans, and negatively impact the unit's overall capacity.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] In response to the problems of weak static pressure resistance, uneven airflow, and uneven current in top-discharge outdoor units mentioned in the background art, this invention proposes an air conditioner that improves the uniformity of airflow from the top of the unit, the uniformity of operating current, and the reliability of unit operation by separately controlling the operation of the fans.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: An air conditioner includes an outdoor unit; the outdoor unit is a top-discharge type and includes multiple fans, multiple current detection modules, an air volume detection module, and a speed detection and control module. Each of the aforementioned current detection modules is used to detect the operating current of each of the aforementioned fans; The air volume detection module is used to detect the air volume at the top of the outdoor unit; The speed detection and control module is configured with the unit's rated air volume and the fan's current limit. It is connected to each fan, each current detection module, and the air volume detection module, respectively. It receives the operating current, the top air volume, and detects the speed of each fan in real time. Based on the unit's rated air volume, the current limit, the operating current, the top air volume, and the detected speed of each fan, it controls the operation of each fan.

[0007] In some specific embodiments, each of the fans is arranged in multiple groups; each group includes two fans, namely an upper fan and a lower fan, which are arranged correspondingly above and below each other; The speed detection and control module compares the top airflow with the unit's rated airflow and each operating current with the current limit in real time. When the top airflow does not exceed the unit's rated airflow and each operating current is less than the current limit, the speed of each fan is increased simultaneously. When the operating current of the lower fan reaches and / or exceeds the current limit, the module controls each lower fan to stop increasing its speed, and each upper fan to continue increasing its speed until the top airflow reaches or exceeds the unit's rated airflow.

[0008] In some specific embodiments, the speed detection and control module compares the top airflow with the unit's rated airflow and each of the operating currents with the current limit in real time; when the top airflow exceeds the unit's rated airflow and any one or more of the operating currents exceed the current limit, the speed of each fan is simultaneously reduced until the operating current of each lower fan is less than or equal to the current limit, the reduction of the speed of each lower fan is stopped and the speed of each upper fan is increased until the top airflow reaches or exceeds the unit's rated airflow.

[0009] In some specific embodiments, the current limit is the difference between the rated current of the fan and a limiting constant; The range of the limiting constant is 0.1A to 1A.

[0010] In some specific embodiments, the speed detection and control module is further configured with a first down fan current difference threshold and a second down fan current difference threshold; the first down fan current difference threshold is less than the second down fan current difference threshold. The speed detection and control module calculates the absolute value of the difference between the operating currents of any two downwind fans based on the obtained operating currents, and compares it with the first downwind fan current difference threshold and the second downwind fan current difference threshold. When the absolute value of the operating current difference is between the first downwind fan current difference threshold and the second downwind fan current difference threshold, the downwind fan with the larger operating current is controlled to reduce its speed, and the downwind fan with the smaller operating current is controlled to increase its speed until the absolute value of the difference between its operating currents is less than the first downwind fan current difference threshold. The speed reduction or increase of the two down fans is equal.

[0011] In some specific embodiments, the rotational speed detection and control module is configured with a first proportional constant less than 1; When the absolute value of the difference in operating current is greater than the second lower fan current difference threshold, the speed of the lower fan with the larger operating current is reduced and the speed of the lower fan with the smaller operating current is increased until the absolute value of the difference in operating current is less than the first lower fan current difference threshold; the reduced speed and the increased speed are equal. The upper fan corresponding to the lower fan with a smaller operating current is controlled to reduce its speed, and the upper fan corresponding to the lower fan with a larger operating current is controlled to increase its speed; the speed reduction and speed increase of the two upper fans are equal, and are equal to the first proportional constant multiple of the speed change of the lower fan.

[0012] In some specific embodiments, the speed detection and control module is configured with a first upper fan current difference threshold and a second upper fan current difference threshold that is greater than the first upper fan current difference threshold, and is configured to calculate the absolute value of the difference between the operating currents of any two upper fans based on the obtained operating currents, and compare the absolute value of the difference between the operating currents with the first upper fan current difference threshold and the second upper fan current difference threshold. When the absolute value of the difference in operating current is between the first upper fan current difference threshold and the second upper fan current difference threshold, the upper fan with the larger operating current is controlled to reduce its speed and the upper fan with the smaller operating current is controlled to increase its speed until the absolute value of the difference in operating current is less than the first upper fan current difference threshold; the reduced speed is equal to the increased speed.

[0013] In some specific embodiments, the rotational speed detection and control module is configured with a second proportional constant less than 1; When the absolute value of the difference in operating current is greater than the second upper fan current difference threshold, the upper fan with the larger operating current is controlled to reduce its speed and the upper fan with the smaller operating current is controlled to increase its speed until the absolute value of the difference in operating current is less than the first upper fan current difference threshold; the reduced speed is equal to the increased speed. The speed of the lower fan of the upper fan corresponding to the one with a large operating current is increased, and the speed of the lower fan of the upper fan corresponding to the one with a small operating current is decreased. The increased speed and the decreased speed are both equal to a second proportional constant multiple of the speed of the corresponding upper fan.

[0014] In some specific embodiments, the threshold value of the current difference between the first down fan and the first up fan is equal to the threshold value of the current difference between the first down fan and the second up fan; the threshold value of the current difference between the second down fan and the second up fan are equal to the threshold value of the current difference between the second down fan and the second up fan. The first proportionality constant is equal to the second proportionality constant.

[0015] In some specific embodiments, the speed detection and control module calculates the average value of the operating current of each of the upper fans based on the real-time obtained operating currents, and obtains the average value of the upper fan current; the speed detection and control module calculates the average value of the operating current of each of the lower fans based on the real-time obtained operating currents, and obtains the average value of the lower fan current. The speed detection and control module is configured with an average current difference threshold; and compares the difference between the average current of the lower fan and the average current of the upper fan with the average current difference threshold. When the difference between the average current of the lower fan and the average current of the upper fan reaches and / or exceeds the average current difference threshold, the lower fan is controlled to reduce its speed and the upper fan is controlled to increase its speed until the difference between the average current of the lower fan and the average current of the upper fan is less than the average current difference threshold; the speed reduction of the lower fan is equal to the speed increase of the upper fan.

[0016] The air conditioner of this invention uses a speed detection and control module to control the operation of each fan according to its configured unit rated air volume, fan current limit, real-time received top air volume, operating current of each fan, and detected speed of each fan. This achieves a balanced state where the operating current of each fan does not exceed the current limit and the top air volume meets the unit's rated air volume requirements. This not only protects the fans and extends their lifespan, but also improves the uniformity of the top air volume of the outdoor unit and the balance of the operating current of each fan, thereby improving the stability and reliability of the outdoor unit's operation and ensuring heat exchange efficiency.

[0017] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the outdoor unit of an air conditioner according to an embodiment; Figure 2 This is a schematic diagram of the control connection structure of the outdoor unit of an air conditioner according to an embodiment; Figure 3 This is a schematic diagram of the control flow of each fan in the outdoor unit of an air conditioner according to an embodiment; Figure 4 This is a schematic diagram of the control flow of each fan in the outdoor unit of an air conditioner according to an embodiment; Figure 5 This is a schematic diagram of the control flow of each fan in the outdoor unit of an air conditioner according to an embodiment; Figure 6 This is a schematic diagram of the control flow of each fan in the outdoor unit of an air conditioner according to an embodiment; Figure 7 This is a schematic diagram of the control flow of each fan in the outdoor unit of an air conditioner according to an embodiment; Figure 8 This is a schematic diagram of the control flow of each fan in the outdoor unit of an air conditioner according to an embodiment; Figure 9 This is a schematic diagram of the control flow of each fan in the outdoor unit of an air conditioner according to an embodiment; Figure 10 This is a schematic diagram of the control flow of each fan in the outdoor unit of an air conditioner according to an embodiment. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0026] Air Conditioner Working Principle Air conditioners execute a refrigeration cycle using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat an indoor space.

[0027] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0028] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0029] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0030] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0031] [This application] Reference Figure 1 , Figure 2 , Figure 3 This invention discloses an air conditioner, which includes an outdoor unit 1; the outdoor unit 1 is a top-discharge type, including a housing 16, a condenser, and multiple fans; the housing 16 is a box with an opening at the top for air outlet; each fan is respectively disposed in the housing 16; each fan is used to condense and dissipate heat for the condenser, and forms an air duct for air outlet from the top of the outdoor unit 1, so that the heat from condensation is discharged from the air outlet at the top of the outdoor unit 1.

[0032] The outdoor unit 1 also includes an air volume detection module 15, multiple current detection modules 14, and a speed detection and control module 13 that is connected to each fan, the air volume detection module 15, and each current detection module 14 respectively. The air volume detection module 15 is located inside the air outlet and is used to detect the air volume of the outdoor unit 1, obtain the top air volume, and transmit it to the speed detection and control module 13. Each current detection module 14 is used to detect the operating current of each fan and transmit it to the speed detection and control module 13.

[0033] The speed detection and control module 13 is configured with the unit's rated air volume, the fan's current limit S1, and the detection speed of each fan. It is also configured to receive the top outlet air volume and each operating current in real time S2, and control the operation of each fan S3 according to the unit's rated air volume, current limit, real-time received top outlet air volume, and each operating current. Individual control of each fan can be used to control the speed of one fan, multiple fans, or all fans, increasing or decreasing their speed.

[0034] That is, when controlling one of the fans, the speed detection and control module 13 controls the fan to increase or decrease its speed; when controlling multiple fans, it controls each fan to increase its speed, or controls each fan to decrease its speed, or controls a portion of the multiple fans to increase its speed and another portion to decrease its speed; when controlling all the fans, it controls each fan to increase its speed, or controls each fan to decrease its speed, or controls a portion of the fans to increase its speed and another portion to decrease its speed, or controls a portion or all of the fans to decrease or increase their speed and then another portion of the fans to increase or decrease their speed, etc.

[0035] The air conditioner of the present invention uses a speed detection and control module 13 to control the operation of each fan according to the rated air volume of the unit, the current limit of the fan, the real-time received top air volume, the operating current of each fan, and the detected speed of each fan. This achieves a balanced state in which the operating current of each fan does not exceed the current limit and the top air volume meets the requirements of the rated air volume of the unit. This not only protects the fans and extends their lifespan, but also improves the uniformity of the top air volume of the outdoor unit 1 and the balance of the operating current of each fan, thereby improving the stability and reliability of the outdoor unit 1 and ensuring heat exchange efficiency.

[0036] The speed detection and control module 13 may include a controller and a speed detection module, a speed control module and a signal processing module connected to the controller.

[0037] The specific control process and working principle of the air conditioner of the present invention will be described in detail below through specific embodiments.

[0038] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 Each fan is set in a group; each group includes two fans, namely the upper fan 12 and the lower fan 11, which are set up correspondingly inside the air outlet and above the condenser to enhance the air velocity in the air duct and improve its static pressure resistance.

[0039] Furthermore, the lower fan 11 mainly bears the resistance of the air drawn in from the air inlet and passing through the condenser, and its load is significantly higher than that of the upper fan 12.

[0040] The speed detection and control module 13 compares the received top air volume with the unit's rated air volume and the received operating current with the current limit in real time (S31). When the top air volume does not exceed the unit's rated air volume and all operating currents do not exceed the current limit (S321), it controls each fan to simultaneously increase its speed (S33) until the operating current of each lower fan 11 reaches or exceeds the current limit (S323). Then, it controls each lower fan 11 to stop increasing its speed, and each upper fan 12 to continue increasing its speed (S351) until the top air volume reaches and / or exceeds the unit's rated air volume (S36). Finally, it controls each upper fan 12 to stop increasing its speed (S37).

[0041] That is, when the top air volume does not exceed the rated air volume of the unit and each operating current does not exceed the current limit, the speed of each fan is increased simultaneously while the operating current is compared with the current limit in real time. When the operating current of the lower fan 11 reaches and / or exceeds the current limit, the speed of each lower fan 11 is stopped while the speed of each upper fan 12 continues to increase. At the same time, the top air volume is compared with the rated air volume of the unit in real time. When the top air volume reaches and / or exceeds the rated air volume of the unit, the speed of each upper fan 12 is stopped.

[0042] In this embodiment, the air conditioner controls all fans to increase their speed simultaneously based on the fact that the lower fan 11 of the outdoor unit 1 bears more air intake resistance, resulting in a greater load on the lower fan 11. At the same time, it judges whether the operating current of each lower fan 11 has reached or exceeded the current limit. When the current limit is reached or exceeded, it controls the fan to stop increasing its speed, while each upper fan 12 continues to increase its speed. This makes the operating current distribution of each upper fan 12 and each lower fan 11 more uniform, improves the performance utilization of each fan, and thus improves the stability, reliability, and efficiency of the air conditioner unit.

[0043] Of course, the rated air volume of the unit can be multiple, each corresponding to a different static pressure.

[0044] In addition, the control of each fan in this embodiment can also be applied to the development process of outdoor unit 1 to select the rated power of the fan more rationally.

[0045] Specifically, when the speed of each lower fan 11 stops increasing, the speed of each upper fan 12 continues to increase. If the top airflow still cannot meet the unit's rated airflow requirement when the operating current of each upper fan 12 reaches or exceeds the current limit, then a higher-power fan should be used to replace the original fan to meet the unit's rated airflow requirement. Of course, if the operating current is significantly lower than the current limit but the top airflow has already met the unit's rated airflow requirement, then a lower-power fan should be used to replace the original fan to meet the lower power requirements and save costs.

[0046] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5The speed detection and control module 13 compares the obtained top airflow with the unit's rated airflow and the obtained operating currents with current limits in real time (S31). When the top airflow exceeds the unit's rated airflow and any one or more of the operating currents exceeds the current limit (S322), it controls each fan to simultaneously reduce its speed (S34) until the operating current of each lower fan 11 does not exceed the current limit (S324). That is, it compares each operating current with the current limit. When the operating current of the lower fan 11 is less than the current limit, it stops reducing the speed of each fan and controls each upper fan 12 to increase its speed (S352) until the top airflow meets the unit's rated airflow requirement (S36). That is, when each lower fan 11 stops reducing its speed and continues to increase the speed of each upper fan 12, it compares the top airflow with the unit's rated airflow, and when the top airflow meets the unit's rated airflow requirement, it controls each upper fan 12 to stop increasing its speed (S37).

[0047] Of course, the control of each fan in this embodiment can also be applied to the development process of outdoor unit 1 to select the rated power of the fan more reasonably.

[0048] Specifically, if the top airflow still cannot meet the unit's rated airflow requirements when the operating current of each upper fan 12 reaches or exceeds the current limit after each lower fan 11 stops reducing its speed and controls the increase of the speed of each upper fan 12, then a higher power fan should be used to replace the existing fan.

[0049] In some specific embodiments, the current limit is the difference between the rated current of the fan and the limiting constant; the limiting constant ranges from 0.1A to 1A.

[0050] In addition, the top air outlet volume can meet the unit's rated air volume requirement within a certain threshold range; while exceeding the unit's rated air volume can exceed a certain threshold. This ensures that the speed detection and control module 13 will not frequently adjust or over-control when determining whether the top air outlet volume meets or exceeds the unit's rated air volume, thereby improving the stability of the air conditioner's control and thus improving the stability and reliability of the air conditioner's unit operation.

[0051] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7After adjusting the speed of each fan to achieve initial adjustment of the current balance of each fan and the top air volume to meet the rated air volume requirements of the unit, the problem of uneven external static pressure or wind resistance caused by the installation position and installation method of outdoor unit 1 is adjusted to further overcome the problem of unstable unit operation caused by uneven external static pressure or wind resistance, and improve the stability of unit operation of outdoor unit 1.

[0052] The speed detection and control module 13 is also equipped with a first down fan 11 current difference threshold and a second down fan 11 current difference threshold S81; the first down fan 11 current difference threshold is less than the second down fan 11 current difference threshold.

[0053] The speed detection and control module 13 is further configured to calculate the absolute value S21 of the difference between the operating currents of any two lower fans 11 based on the obtained operating currents, and compare it with the current difference threshold of the first lower fan 11 and the current difference threshold of the second lower fan 11 S39; when the absolute value of the difference between the operating currents is between the current difference threshold of the first lower fan 11 and the current difference threshold of the second lower fan 11 S325, control the lower fan 11 with the larger operating current to reduce its speed and the lower fan 11 with the smaller operating current to increase its speed S310, and at the same time continue to calculate the absolute value of the difference between the operating currents of the two lower fans 11 based on the obtained operating currents, and compare it with the current difference threshold of the first lower fan 11, and when the absolute value of the difference between the operating currents is less than the current difference threshold of the first lower fan 11 S327, control each lower fan 11 to stop reducing its speed or increasing its speed S320; that is, control each lower fan 11 to stop changing its speed; at this time, the magnitude of the increase and decrease in speed of each lower fan 11 is equal.

[0054] The speed detection and control module 13 is also equipped with a first proportional constant S82 less than 1, and is configured to control the speed of the lower fan 11 with a large operating current to decrease and the speed of the lower fan 11 with a small operating current to increase when the absolute value of the difference in operating current is greater than the current difference threshold of the first lower fan 11 S326, until the absolute value of the difference in operating current is less than the current difference threshold of the first lower fan 11 S327.

[0055] That is, when the absolute value of the difference in operating current is greater than the current difference threshold of the second lower fan 11, the speed of the lower fan 11 with the larger operating current is reduced and the speed of the lower fan 11 with the smaller operating current is increased. The absolute value of the difference in operating current between the two fans is calculated in real time and compared with the current difference threshold of the first lower fan 11. When the absolute value of the difference in operating current is less than the current difference threshold of the first lower fan 11, S327, the speed of the two lower fans 11 is stopped from changing, S320. The speed increased by one of the two lower fans 11 is equal to the speed decreased by the other.

[0056] Then, the speeds of the upper fans 12 corresponding to the two lower fans 11 are controlled to change in opposite directions to compensate for the uneven airflow caused by the large changes in the speeds of the two lower fans 11. That is, the speed of the upper fan 12 corresponding to the lower fan 11 with increased speed is reduced, and the speed of the upper fan 12 corresponding to the lower fan 11 with reduced speed is increased. The increased speed and decreased speed of the upper fan 12 are equal and equal to a first proportional constant multiple S330 of the increased or decreased speed of the corresponding lower fan 11.

[0057] Of course, when the absolute value of the difference between the operating currents of any two down fans 11 is less than the current difference threshold of the first down fan 11, the rotation speed of each down fan 11 and the rotation speed of each up fan 12 will not change.

[0058] Exhaustively adjust the speed of any two downwind fans 11 and the corresponding speed of the upwind fan 12.

[0059] In this embodiment, the air conditioner determines the static pressure imbalance of the outdoor unit 1 by the difference in the operating current of any two lower fans 11. Then, it balances the air volume and current of each fan by changing the speed of the lower fans 11. When the speed of each lower fan 11 changes significantly, it reverses the speed of the upper fan 12 corresponding to each lower fan 11 to compensate for the air volume difference caused by the large difference in the speed of the lower fans 11. This ensures that the unit can still output air evenly and operate stably and reliably under the condition of uneven static pressure and air resistance, and can maintain the overall air volume balance.

[0060] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 The speed detection and control module 13 is also equipped with a first upper fan 12 current difference threshold and a second upper fan 12 current difference threshold S83 that is less than the first upper fan 12 current difference threshold, and is configured to calculate the absolute value of the difference between the operating currents of any two upper fans 12 based on the obtained operating currents, and compare the absolute value of the difference between the above operating currents with the first upper fan 12 current difference threshold and the second upper fan 12 current difference threshold S340.

[0061] When the absolute value of the difference in operating current is between the current difference threshold of the first upper fan 12 and the current difference threshold of the second upper fan 12, in step S328, the upper fan 12 with the larger operating current is controlled to reduce its speed and the upper fan 12 with the smaller operating current is controlled to increase its speed, in step S350, until the absolute value of the difference in operating current is less than the current difference threshold of the first upper fan 12, and the reduced speed is equal to the increased speed.

[0062] That is, when the absolute value of the difference in the operating current is between the current difference threshold of the first upper fan 12 and the current difference threshold of the second upper fan 12, the upper fan 12 with the larger operating current is controlled to reduce its speed and the upper fan 12 with the smaller operating current is controlled to increase its speed. At the same time, the absolute value of the difference in the operating current of the two upper fans 12 is obtained in real time and compared with the current difference threshold of the first upper fan 12. When the absolute value of the difference in the operating current is less than the current difference threshold of the first upper fan 12, S360, the speed of each upper fan 12 is stopped from being changed, S370.

[0063] The speed detection and control module 13 is also equipped with a second proportional constant S84 less than 1, and is configured to control the upper fan 12 with a large operating current to reduce its speed and the upper fan 12 with a small operating current to increase its speed S350 when the absolute value of the difference between the above operating currents is greater than the current difference threshold of the first upper fan 12 S329, until the absolute value of the difference between the above operating currents is less than the current difference threshold of the first upper fan 12 S360; the reduced speed is equal to the increased speed.

[0064] That is, when the absolute value of the difference between the above-mentioned operating currents is greater than the current difference threshold of the second upper fan 12, while controlling the upper fan 12 with the larger operating current to reduce its speed and the upper fan 12 with the smaller operating current to increase its speed, the operating currents are acquired in real time and the absolute value of the difference between the operating currents of the two upper fans 12 is calculated. The absolute value of the difference between the above-mentioned operating currents is compared with the current difference threshold of the first upper fan 12. When the absolute value of the difference between the above-mentioned operating currents is less than the current difference threshold of the first upper fan 12, S360, the speed of each upper fan 12 is stopped from being changed, S380.

[0065] Then, the speed of the down fan 11 corresponding to each up fan 12 with a changed speed is adjusted in the opposite direction to compensate for the air volume difference caused by the large reverse speed change of the two down fans 11; that is, the speed of the down fan 11 corresponding to the up fan 12 with an increased speed is reduced, and the speed of the down fan 11 corresponding to the down fan 12 with a reduced speed is increased; the number of reduced speeds and the number of increased speeds are equal and are equal to the second proportional constant multiple of the number of speeds changed by the corresponding up fan 12.

[0066] Of course, when the absolute value of the difference between the operating currents of the two upper fans 12 is less than the current difference threshold of the first upper fan 12, the rotation speed of each lower fan 11 and the rotation speed of each upper fan 12 will not change.

[0067] Exhaustively adjust the rotational speed of any two upper fans 12 and the corresponding rotational speed of the lower fans 11.

[0068] In this embodiment, the air conditioner determines the static pressure imbalance of the outdoor unit 1 after adjusting the speed of the lower outdoor fan 11 based on the difference in the operating current of any upper fan 12. It balances the air volume and current of each fan group by changing the speed of the upper fan 12, and compensates for the air volume difference caused by the large reverse change in the speed of any two upper fans 12 by adjusting the speed of the lower fan 11 corresponding to each upper fan 12 in the opposite direction. This further improves the uniformity of the unit's air output and the stability and reliability of its operation, while maintaining the overall balance of the air volume at the top.

[0069] In some specific embodiments, the first proportional constant is equal to the second proportional constant, and is equal to 0.5. Of course, the first and second proportional constants can also be set to different values, and can be adjusted as needed.

[0070] The current difference threshold of the first down fan 11 is equal to the current difference threshold of the first up fan 12; the current difference threshold of the second down fan 11 is equal to the current difference threshold of the second up fan 12.

[0071] In one specific embodiment, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 Outdoor unit 1 includes four fans, arranged in two groups, one above the other.

[0072] The speed detection and control module 13 is configured to calculate the absolute value of the difference between the operating currents of the two lower fans 11 based on the obtained operating currents, compare it with the current difference threshold of the first lower fan 11 and the current difference threshold of the second lower fan 11, and when it is between the current difference threshold of the first lower fan 11 and the current difference threshold of the second lower fan 11, control the lower fan 11 with the larger operating current to reduce its speed and control the lower fan 11 with the smaller operating current to increase its speed until the absolute value of the operating current difference of the lower fan 11 is less than the current difference threshold of the first lower fan 11, and the number of speed increases and decreases of each lower fan 11 is equal.

[0073] When the absolute value of the difference in operating current is greater than the current difference threshold of the second lower fan 11, the speed of the lower fan 11 with the larger operating current is reduced and the speed of the lower fan 11 with the smaller operating current is increased until the absolute value of the difference in operating current between the two lower fans 11 is less than the current difference threshold of the first lower fan 11.

[0074] Then, the speeds of the corresponding upper fans 12 of each lower fan 11 are controlled to change in opposite directions to compensate for the uneven airflow caused by the large speed changes of the two lower fans 11. That is, the speed of the upper fan 12 corresponding to the lower fan 11 with increased speed is reduced, and the speed of the upper fan 12 corresponding to the lower fan 11 with reduced speed is increased. The speed increase and speed reduction of the upper fan 12 are equal and equal to a first proportional constant multiple of the speed increase or decrease of the corresponding lower fan 11.

[0075] When the absolute value of the difference between the operating currents of the two down fans 11 is less than the current difference threshold of the first down fan 11, the rotation speed of each down fan 11 and the rotation speed of each up fan 12 do not change.

[0076] Then, the absolute value of the difference between the operating currents of the two upper fans 12 is compared with the current difference threshold of the first upper fan 12 and the current difference threshold of the second upper fan 12. When the difference is between the current difference threshold of the first upper fan 12 and the current difference threshold of the second upper fan 12, the upper fan 12 with the larger operating current is controlled to reduce its speed and the upper fan 12 with the smaller operating current is controlled to increase its speed until the absolute value of the difference between the operating currents is less than the current difference threshold of the first upper fan 12, and the reduced speed is equal to the increased speed.

[0077] When the absolute value of the difference in operating current is greater than the current difference threshold of the second upper fan 12, the upper fan 12 with the larger operating current is controlled to reduce its speed and the upper fan 12 with the smaller operating current is controlled to increase its speed until the absolute value of the difference in operating current is less than the current difference threshold of the first upper fan 12; the reduced speed is equal to the increased speed.

[0078] Then, the speed of the down fan 11 corresponding to each up fan 12 with a changed speed is adjusted in the opposite direction to compensate for the air volume difference caused by the large reverse speed change of the two up fans 12; that is, the speed of the down fan 11 corresponding to the up fan 12 with increased speed is reduced, and the speed of the down fan 11 corresponding to the down fan 12 with reduced speed is increased; the magnitude of the reduction in speed and the magnitude of the increase in speed are equal, and are equal to the second proportional constant multiple of the number of speed changes of the corresponding up fan 12.

[0079] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 The average current of each down fan 11 and each up fan 12 is adjusted to make the unit operation more stable and reliable.

[0080] Specifically, the speed detection and control module 13 is equipped with an average current difference threshold S3100 and is configured to acquire each operating current in real time and calculate the average value of the operating current of each upper fan 12, that is, to obtain the average current of the upper fan 12; and calculate the average value of the operating current of each lower fan 11, that is, to obtain the average current of the lower fan 11.

[0081] The speed detection and control module 13 is configured to compare the difference between the average current of the lower fan 11 and the average current of the upper fan 12 in real time (S3200) and the average current difference threshold (S3300); when the difference between the average current of the lower fan 11 and the average current of the upper fan 12 reaches and / or exceeds the average current difference threshold (S3400), the module controls each lower fan 11 to reduce its speed and each upper fan 12 to increase its speed (S3500) until the difference between the average current of the lower fan 11 and the average current of the upper fan 12 is less than the average current difference threshold (S3600); the number of speed reductions by each lower fan 11 and the number of speed increases by each upper fan 12 are equal.

[0082] That is, when the difference between the average current of the down fan 11 and the average current of the up fan 12 is less than the average current difference threshold S3600, the down fans are controlled to stop reducing their speed and the up fans are controlled to stop increasing their speed S3700.

[0083] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0084] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioner, characterized in that, Includes an outdoor unit; the outdoor unit is a top-discharge type, including: Multiple fans are arranged in multiple groups; each group includes two fans, namely an upper fan and a lower fan, which are arranged correspondingly above and below each other. Multiple current detection modules are used to detect the operating current of each of the aforementioned fans; An airflow detection module is used to detect the airflow from the top of the outdoor unit; The speed detection and control module is configured with the unit's rated air volume and the current limit of the fan. It is connected to each fan, each current detection module, and the air volume detection module respectively. It receives the operating current of each fan, the top air volume, and detects the speed of each fan in real time. It controls the operation of each fan according to the unit's rated air volume, the current limit, the operating current, the top air volume, and the detected speed of each fan. The speed detection and control module compares the top airflow with the unit's rated airflow and each operating current with the current limit in real time. When the top airflow does not exceed the unit's rated airflow and each operating current is less than the current limit, the speed of each fan is increased simultaneously. When the operating current of the lower fan reaches and / or exceeds the current limit, the lower fan is controlled to stop increasing its speed, and the upper fan continues to increase its speed until the top airflow reaches or exceeds the unit's rated airflow. When the top airflow exceeds the unit's rated airflow and any one or more of the operating currents exceeds the current limit, the speed of each fan is decreased simultaneously until the operating current of each lower fan is less than or equal to the current limit, the decrease in the speed of each lower fan is stopped, and the speed of each upper fan is increased until the top airflow reaches or exceeds the unit's rated airflow.

2. The air conditioner according to claim 1, characterized in that, The current limit is the difference between the rated current of the fan and the limiting constant; The range of the limiting constant is 0.1A to 1A.

3. The air conditioner according to claim 1, characterized in that, The speed detection and control module is also equipped with a first down fan current difference threshold and a second down fan current difference threshold; the first down fan current difference threshold is less than the second down fan current difference threshold. The speed detection and control module calculates the absolute value of the difference between the operating currents of any two downwind fans based on the obtained operating currents, and compares it with the first downwind fan current difference threshold and the second downwind fan current difference threshold. When the absolute value of the operating current difference is between the first downwind fan current difference threshold and the second downwind fan current difference threshold, the downwind fan with the larger operating current is controlled to reduce its speed, and the downwind fan with the smaller operating current is controlled to increase its speed until the absolute value of the difference between its operating currents is less than the first downwind fan current difference threshold. The speed reduction or increase of the two down fans is equal.

4. The air conditioner according to claim 3, characterized in that, The speed detection and control module is equipped with a first proportional constant less than 1; When the absolute value of the difference in operating current is greater than the second lower fan current difference threshold, the speed of the lower fan with the larger operating current is reduced and the speed of the lower fan with the smaller operating current is increased until the absolute value of the difference in operating current is less than the first lower fan current difference threshold; the reduced speed and the increased speed are equal. The upper fan corresponding to the lower fan with a smaller operating current is controlled to reduce its speed, and the upper fan corresponding to the lower fan with a larger operating current is controlled to increase its speed; the speed reduction and speed increase of the two upper fans are equal, and are equal to the first proportional constant multiple of the speed change of the lower fan.

5. The air conditioner according to claim 4, characterized in that, The speed detection and control module is configured with a first upper fan current difference threshold and a second upper fan current difference threshold that is greater than the first upper fan current difference threshold, and is configured to calculate the absolute value of the difference between the operating currents of any two upper fans based on the obtained operating currents, and compare the absolute value of the difference between the operating currents with the first upper fan current difference threshold and the second upper fan current difference threshold. When the absolute value of the difference in operating current is between the first upper fan current difference threshold and the second upper fan current difference threshold, the upper fan with the larger operating current is controlled to reduce its speed and the upper fan with the smaller operating current is controlled to increase its speed until the absolute value of the difference in operating current is less than the first upper fan current difference threshold; the reduced speed is equal to the increased speed.

6. The air conditioner according to claim 5, characterized in that, The speed detection and control module is equipped with a second proportional constant less than 1; When the absolute value of the difference in operating current is greater than the second upper fan current difference threshold, the upper fan with the larger operating current is controlled to reduce its speed and the upper fan with the smaller operating current is controlled to increase its speed until the absolute value of the difference in operating current is less than the first upper fan current difference threshold; the reduced speed is equal to the increased speed. The speed of the lower fan of the upper fan corresponding to the one with a large operating current is increased, and the speed of the lower fan of the upper fan corresponding to the one with a small operating current is decreased. The increased speed and the decreased speed are both equal to a second proportional constant multiple of the speed of the corresponding upper fan.

7. The air conditioner according to claim 6, characterized in that, The current difference threshold of the first down fan is equal to the current difference threshold of the first up fan; the current difference threshold of the second down fan is equal to the current difference threshold of the second up fan. The first proportionality constant is equal to the second proportionality constant.

8. The air conditioner according to claim 6, characterized in that, The speed detection and control module calculates the average operating current of each upper fan based on the real-time obtained operating current, and obtains the average current of the upper fan; the speed detection and control module calculates the average operating current of each lower fan based on the real-time obtained operating current, and obtains the average current of the lower fan. The rotational speed detection and control module is equipped with an average current difference threshold. The difference between the average current of the lower fan and the average current of the upper fan is compared with the average current difference threshold. When the difference between the average current of the lower fan and the average current of the upper fan reaches and / or exceeds the average current difference threshold, the speed of each lower fan is reduced and the speed of each upper fan is increased until the difference between the average current of the lower fan and the average current of the upper fan is less than the average current difference threshold. The speed reduction of the lower fan is equal to the speed increase of the upper fan.

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