Air conditioner outdoor unit and multi-split air conditioner system

Abstract

The invention discloses a multi-split system and air conditioner outdoor units. The multi-split system comprises a plurality of air conditioner outdoor units and a plurality of indoor units. Each air conditioner outdoor unit comprises a main unit and at least one slave unit which are in communication connection and are in communication connection with the indoor units. The air conditioner outdoor unit comprises an outdoor heat exchanger, a controller and an air volume coefficient obtaining module used for obtaining the air volume coefficient of the outdoor heat exchanger. The air volume coefficient represents the heat exchange capacity of the outdoor heat exchanger influenced by the air volume; the controller is configured with a load upper limit and configuration parameters of the outdoor heat exchanger, is connected with the air volume coefficient acquisition module, receives the air volume coefficient and acquires a heat exchange capability coefficient of the outdoor heat exchanger according to the configuration parameters and the air volume coefficient; and the controller of the host obtains the load demand of each indoor unit, the load upper limit of each slave unit and the heat exchange capacity coefficient, and obtains the operation load of each air conditioner outdoor unit according to each load demand, each load upper limit and each heat exchange capacity coefficient. The operation efficiency of the multi-split system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an outdoor unit of an air conditioner and a multi-connected unit system. Background Art

[0002] In the prior art, a modular multi-connected unit determines whether to reduce the frequency of multiple compressors by judging whether the exhaust pressure, exhaust temperature, and suction pressure of the outdoor units of the air conditioners in the system exceed the thresholds. When the exhaust pressure or temperature of the compressor of one of the outdoor units is too high, the overall frequency of each outdoor unit of the air conditioner is controlled and operated to protect the reliability of the unit, but the capacity and energy efficiency of the unit will be greatly attenuated. Especially when there are large differences in the compressor displacement and heat exchanger area configuration between the outdoor units; for example, when the heat exchanger area of one of the outdoor units is small and the compressor displacement is large, this outdoor unit will operate at full load or overload, and is easily protected and frequency-reduced by the unit, while other outdoor units operate at low load, increasing the probability of overall frequency reduction of the unit and making it easier to reduce the capacity and energy efficiency of the unit.

[0003] The reason for this problem is the existing capacity allocation method; the first allocation method is that each outdoor unit exerts its capacity on average, that is, the compressor frequencies of each outdoor unit are the same; the second allocation method is to consider the matching between the compressor frequency of each module and the size of the heat exchanger, and allocate the compressor frequency according to the ratio of the highest operating frequencies of each outdoor unit. Neither of these two capacity allocation methods considers the problem that when one outdoor unit encounters special reasons resulting in frequent protection and frequency reduction of the unit.

[0004] The above information disclosed in this background art is only used to increase the understanding of the background art of the present application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0005] In view of the problem in the background art that when one or more of the outdoor units of the air conditioner in the multi-connected unit system have abnormal system pressure or temperature due to unreasonable frequency distribution of each outdoor unit of the air conditioner, frequency reduction protection affects the system efficiency and capacity, the present invention provides an outdoor unit of an air conditioner and a multi-connected unit system, which realizes the allocation of loads according to the installation and configuration conditions of each outdoor unit of the air conditioner, and improves the operation efficiency and reliability of the multi-connected unit.

[0006] To achieve the above object of the invention, the present invention adopts the following technical solutions: An outdoor unit of an air conditioner is applied to a multi-connected unit system including a plurality of the outdoor units of the air conditioner and a plurality of indoor units, and can be a main unit or a slave unit; in the multi-connected unit system, each of the outdoor units of the air conditioner is communicatively connected to each other and communicatively connected to each of the indoor units; The outdoor unit of the air conditioner includes an outdoor heat exchanger, a controller, and an air volume coefficient acquisition module for acquiring the air volume coefficient of the outdoor heat exchanger; the air volume coefficient characterizes the heat exchange capacity of the outdoor heat exchanger affected by the air volume. The controller is configured with a load upper limit, configuration parameters of the outdoor heat exchanger, and is connected to the air volume coefficient acquisition module, receives the air volume coefficient, and obtains the heat exchange capacity coefficient of the outdoor heat exchanger according to the configuration parameters and the air volume coefficient; the controller of the host obtains the load demands of each indoor unit, the load upper limit of the slave unit, and the heat exchange capacity coefficient, and obtains the operating load of each outdoor unit of the air conditioner according to each load demand, each load upper limit, and each heat exchange capacity coefficient.

[0007] In some specific embodiments, it includes at least one compressor, which respectively corresponds to the same or different upper limit frequencies and is respectively connected to the controller; the controller is configured such that the load upper limit includes at least one of the upper limit frequencies. The operating load of the outdoor unit of the air conditioner includes the operating frequencies of each compressor.

[0008] In some specific embodiments, the configuration parameter is the heat exchanger area; the controller is further configured with a compressor power, and is configured such that the heat exchange capacity coefficient is equal to the product of the air volume coefficient and the heat exchanger area divided by the compressor power.

[0009] In some specific embodiments, the controller is configured with at least one compressor displacement; the controller of the host is configured to obtain the compressor displacements of each outdoor unit of the air conditioner and compare the compressor displacements. When the compressor displacements are equal, the total operating frequency demand is obtained according to the sum of each load demand; the frequency distribution coefficient of each outdoor unit of the air conditioner is calculated, which is equal to the product of the load upper limit and the heat exchange capacity coefficient; each operating load is respectively equal to the product of the proportion of each frequency distribution coefficient relative to the sum of each frequency distribution coefficient and the total operating frequency demand.

[0010] In some specific embodiments, the controller is configured with at least one compressor displacement; the controller of the host is configured to obtain the compressor displacements of each outdoor unit of the air conditioner and compare the compressor displacements. When the displacements are not equal, a reference displacement is set, and the total operating frequency demand is obtained according to each load demand; according to the reference displacement and each compressor displacement, each displacement coefficient of each compressor relative to the reference displacement is obtained; the frequency distribution coefficient of each compressor is calculated, which is equal to the product of the displacement coefficient, the upper limit frequency, and the heat exchange capacity coefficient; each operating frequency is respectively equal to the ratio of each frequency distribution coefficient to the sum of each frequency distribution coefficient multiplied by the total operating frequency demand and divided by the corresponding displacement coefficient.

[0011] In some specific embodiments, it further includes at least one bypass branch, which is connected to the controller, can be controllably connected or cut off, and both ends are respectively connected to and communicate with the exhaust port and the suction port of the compressor. It further includes a high-pressure detector and / or a temperature detector and a low-pressure detector, which are respectively connected to the controller and used to detect the exhaust pressure, exhaust temperature, and suction pressure of the compressor and transmit them to the controller; the controller is configured with a high-pressure threshold, a low-pressure threshold, and a temperature threshold, and is configured to compare the exhaust pressure with the high-pressure threshold and / or the exhaust temperature with the temperature threshold, or the suction pressure with the low-pressure threshold, and when the exhaust pressure exceeds the high-pressure threshold and / or the exhaust temperature exceeds the temperature threshold, or the suction pressure exceeds the low-pressure threshold, control the bypass branch to be connected or control each compressor to reduce the frequency.

[0012] A multi-connected air conditioner system includes a plurality of air conditioner outdoor units and a plurality of indoor units; each of the air conditioner outdoor units is respectively a main unit and at least one slave unit, which are communicatively connected and communicatively connected to each of the indoor units. The air conditioner outdoor unit includes an outdoor heat exchanger, a controller, and an air volume coefficient acquisition module for acquiring the air volume coefficient of the outdoor heat exchanger; the air volume coefficient characterizes the heat exchange capacity of the outdoor heat exchanger affected by the air volume. The controller is configured with a load upper limit and configuration parameters of the outdoor heat exchanger, is connected to the air volume coefficient acquisition module, receives the air volume coefficient, and obtains a heat exchange capacity coefficient according to the configuration parameters and the air volume coefficient; the controller of the main unit acquires the load demands of each indoor unit, the load upper limits of each slave unit, and the heat exchange capacity coefficient, and obtains the operating loads of each air conditioner outdoor unit according to each load upper limit, each load upper limit, and each heat exchange capacity coefficient.

[0013] In some specific embodiments, the air conditioner outdoor unit includes at least one compressor, which respectively corresponds to the same or different upper limit frequencies and is respectively connected to the controller. The controller is configured such that the load upper limit includes at least one of the upper limit frequencies; the operating load of the outdoor unit of the air conditioner includes at least one of the operating frequencies of the compressors; The configuration parameter is the heat exchanger area; the controller is further configured with the compressor power, and is configured such that the heat exchange capacity coefficient is equal to the product of the air volume coefficient and the heat exchanger area divided by the compressor power.

[0014] In some specific embodiments, the controller is configured with at least one compressor displacement; the controller of the main unit is configured to obtain the displacements of the compressors of each outdoor unit of the air conditioner and compare the displacements of the compressors; When the displacements of the compressors are equal, obtain the total operating frequency demand according to each load demand; calculate the frequency distribution coefficient of each outdoor unit of the air conditioner, which is equal to the product of each load upper limit and the heat exchange capacity coefficient; each operating load is respectively equal to the ratio of each frequency distribution coefficient to the sum of the frequency distribution coefficients multiplied by the total operating frequency demand; When the displacements of the compressors are not equal, set a reference displacement; obtain the total operating frequency demand according to each load demand; obtain the displacement coefficient of each compressor displacement relative to the reference displacement according to the reference displacement and each compressor displacement; calculate the frequency distribution coefficient of each compressor, which is equal to the product of the displacement coefficient, the upper limit frequency, and the heat exchange capacity coefficient; each operating frequency is respectively equal to the ratio of each frequency distribution coefficient to the sum of the frequency distribution coefficients multiplied by the total operating frequency demand divided by the corresponding displacement coefficient.

[0015] In some specific embodiments, the outdoor unit of the air conditioner further includes at least one bypass branch, which is connected to the controller, controllably communicates or is cut off, and both ends are respectively connected to and communicate with the exhaust port and the suction port of the compressor; The outdoor unit of the air conditioner further includes a high-pressure detection component and / or a temperature detection component and a low-pressure detection component, which are respectively connected to the controller and are used to detect the exhaust pressure, exhaust temperature, and suction pressure of the compressor and transmit them to the controller; the controller is configured with a high-pressure threshold, a low-pressure threshold, and a temperature threshold, and is configured to compare the exhaust pressure with the high-pressure threshold and / or the exhaust temperature with the temperature threshold, or the suction pressure with the low-pressure threshold, and when the exhaust pressure exceeds the high-pressure threshold and / or the exhaust temperature exceeds the temperature threshold, or the suction pressure exceeds the low-pressure threshold, control the bypass branch to communicate or control the outdoor unit of the air conditioner to reduce the frequency.

[0016] The outdoor unit of the air conditioner and the multi-connected air conditioner system of the present invention consider the influence of the air volume coefficient on the heat exchange capacity of the heat exchanger in the distribution of the operating loads of the outdoor units of the multi-connected air conditioner system, so that when the heat exchange air volume of the outdoor heat exchanger of the outdoor unit of the air conditioner fails to reach the rated air volume due to installation problems and affects the operation of the system, it is reflected in the distribution of its operating load, so that even when it operates according to the distributed operating load affected by the installation problem, it can still be consistent or nearly consistent with other unaffected outdoor units of the air conditioner in terms of system parameters, improving the rationality of the operating load distribution. In addition, while improving the rationality of the operating load distribution, the present invention reduces the probability of overall frequency reduction protection of each compressor of each outdoor unit of the air conditioner caused by abnormal system parameters of a single outdoor unit of the air conditioner due to abnormal factors, improving the operating efficiency and operating reliability of the multi-connected air conditioner system.

[0017] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the composition of the multi-connected air conditioner system and the connection of the refrigerant pipeline according to the embodiment; Figure 2 Schematic diagram of the communication connection of the multi-connected air conditioner system according to the embodiment; Figure 3 Schematic diagram of the composition and connection structure of the outdoor unit of the air conditioner according to the embodiment; Figure 4 Schematic diagram of the process for obtaining the operating load of each outdoor unit of the air conditioner according to the embodiment; Figure 5 Schematic diagram of the process for obtaining the operating load and operating control of each outdoor unit of the air conditioner according to the embodiment; Figure 6 Schematic diagram of the process for obtaining the heat exchange capacity coefficient according to the embodiment; Figure 7 Schematic diagram of the process for obtaining the operating load when the compressor displacement of each outdoor unit of the air conditioner is the same according to the embodiment; Figure 8 Schematic diagram of the process for obtaining the operating load when the compressor displacements of each outdoor unit of the air conditioner are not completely the same according to the embodiment; Figure 9 Schematic diagram of the control process when the multi-connected air conditioner system has an abnormal operation according to the embodiment; Figure 10 Schematic diagram of the control process when an abnormal operation occurs in a multi-connected air conditioner system according to an embodiment; Figure 11 Schematic diagram of the control process when an abnormal operation occurs in a multi-connected air conditioner system according to an embodiment; Figure 12 Schematic diagram of the control process when an abnormal operation occurs in a multi-connected air conditioner system according to an embodiment. Reference numerals

[0020] 1. Outdoor unit of air conditioner; 2. Indoor unit; 11. Outdoor heat exchanger; 12. Air volume coefficient acquisition module; 13. Controller; 14. Communication module; 15. Compressor; 16. High-pressure detector; 17. Temperature detector; 18. Low-pressure detector; 19. Bypass branch. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0022] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0023] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "plurality" is two or more.

[0024] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0026] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0027]

Principle of Air Conditioner

[0028] The low-temperature and low-pressure refrigerant enters the compressor 15, and the compressor 15 compresses the refrigerant into a high-temperature and 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 heat is released to the surrounding environment through the condensation process.

[0029] The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state formed by condensation in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor 15. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0030] The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor 15 and the outdoor heat exchanger. The indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0031] The indoor heat exchanger and the outdoor heat exchanger are used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner serves as a heater in the heating mode. When the indoor heat exchanger is used as an evaporator, the air conditioner serves as a cooler in the cooling mode.

[0032]

Modular Multi-connected Air Conditioner

[0033] Each indoor unit 2 and each outdoor unit communicate through a bus, and a master machine and a slave machine are respectively set to allocate and control the load supply of each outdoor unit, and to allocate and control the load reception of each indoor unit 2 in the same direction, so as to realize a multi-connected air conditioner system with multi-capacity combination.

[0034] The present invention discloses an air conditioner outdoor unit 1 and a multi-connected air conditioner system. The multi-connected air conditioner system includes multiple indoor units 2 connected in communication and multiple outdoor units connected in communication, and each indoor unit 2 is communicatively connected to each outdoor unit; each outdoor unit includes a master machine and at least one slave machine. The air conditioner outdoor unit 1 is an outdoor unit in the multi-connected air conditioner system and can be set as a master machine or a slave machine.

[0035] Refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 The air conditioner outdoor unit 1 of the present invention includes an outdoor heat exchanger 11, a communication module 14, an air volume coefficient acquisition module 12, and a controller 13.

[0036] The controller 13 is connected to the communication module 14; when the communication module 14 is connected to the communication modules 14 of other outdoor air conditioners 1 and each indoor unit 2, it is used to realize the communication connection and communication between the controller 13 and each indoor unit 2 and other outdoor air conditioners 1 through the communication module 14.

[0037] The air volume coefficient acquisition module 12 is connected to the controller 13, and is used to acquire the air volume coefficient of the outdoor heat exchanger 11 and transmit it to the controller 13; the air volume coefficient is used to characterize the heat exchange capacity of the outdoor heat exchanger 11 affected by the air volume.

[0038] The controller 13 is configured with the load upper limit of the outdoor air conditioner 1 and the configuration parameters of the outdoor heat exchanger 11; the load upper limit is the maximum load that the outdoor air conditioner 1 can provide during normal operation.

[0039] The controller 13 is configured to acquire the air volume coefficient and the configuration parameter S1, acquire the heat exchange capacity coefficient S2 of the outdoor heat exchanger 11 according to the configuration parameters and the air volume coefficient of the outdoor heat exchanger 11, and acquire the load distribution coefficient of the outdoor air conditioner 1 according to the load upper limit and the heat exchange capacity coefficient.

[0040] The outdoor air conditioner 1 acting as the host collects the load demands of each indoor unit 2 and the load distribution coefficients or load upper limits and heat exchange capacity coefficients of each slave unit, acquires the total load demand S3 according to each load demand, and acquires the operating loads S4 of each outdoor air conditioner 1 according to the total load demand and the load distribution coefficients of each outdoor air conditioner 1 or the load distribution coefficients obtained from the load upper limit and the heat exchange capacity coefficient.

[0041] By considering the influence of the air volume coefficient on the heat exchange capacity of the heat exchanger in the distribution of the operating loads of each outdoor air conditioner 1 in the multi-connected air conditioner system, the outdoor air conditioner 1 of the present invention realizes that when the heat exchange air volume of the outdoor heat exchanger 11 is less than the rated air volume due to installation problems, which affects the system operation, it is reflected in the distribution of its operating load, so that even when it operates according to the allocated operating load affected by the installation problem, it can still be consistent or nearly consistent with other unaffected outdoor air conditioners 1 in system parameters, improving the rationality of the operating load distribution. In addition, while improving the rationality of the operating load distribution, the present invention reduces the probability of overall frequency reduction protection of each compressor 15 of each outdoor air conditioner 1 caused by abnormal system parameters of a single outdoor air conditioner 1 due to abnormal factors, improving the operating efficiency and reliability of the multi-connected air conditioner system.

[0042] In some specific embodiments, refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5, the controller 13 is configured to calculate the operating load of each air conditioner outdoor unit 1 acting as the host and transmit the obtained respective operating loads to each slave unit S5; the host and each slave unit control the operation of each compressor 15 according to the respective operating loads.

[0043] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , the air conditioner outdoor unit 1 includes at least one compressor 15, which respectively correspond to the same or different upper limit frequencies, are connected to the controller 13, and are controlled by the controller 13.

[0044] The controller 13 is configured such that the load upper limit of the air conditioner outdoor unit 1 includes the upper limit frequencies of at least one compressor 15, and the operating load of the air conditioner outdoor unit 1 includes the operating frequencies of at least one compressor 15.

[0045] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , the configuration parameter of the outdoor heat exchanger 11 configured in the controller 13 is the heat exchanger area; the controller 13 is further configured with a compressor power S21, which is the sum of the powers of all the compressors 15 in the air conditioner outdoor unit 1, and is configured such that the heat transfer capacity coefficient is equal to the product of the air volume coefficient and the heat transfer area divided by the compressor 15 power S22.

[0046] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , the compressor 15 power is the number of horsepower of the air conditioner outdoor unit 1.

[0047] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6, the outdoor unit 1 of the air conditioner further includes a control circuit board, which includes a controller 13; the air volume coefficient acquisition module 12 can be realized by setting multiple DIP switches on the control circuit board; different DIP switches or different combinations of DIP switches represent different levels of air volume coefficients; the correspondence between the DIP switches and different levels of air volume coefficients is configured in the controller 13. In addition, by showing the corresponding installation conditions for different DIP switches or different combinations of DIP switches in the product installation guide document, it is convenient for installers to measure and input, and thus the air volume coefficient acquisition module 12 can acquire the air volume coefficient.

[0048] Of course, the air volume coefficient can also be input through other stepless input methods, such as setting a variable potentiometer in the circuit.

[0049] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , the outdoor unit 1 of the air conditioner further includes a pressure sensor, which is arranged on the outdoor heat exchanger 11, connected to the controller 13, and is used to detect the operating static pressure value and transmit it to the controller 13; the controller 13 obtains the air volume coefficient according to the comparison between the static pressure value corresponding to the rated wind speed and the operating static pressure value.

[0050] The air volume coefficient acquisition module 12 of the outdoor unit 1 of the air conditioner in this embodiment automatically acquires through the pressure sensor, improving the accuracy and efficiency, and can also realize the acquisition and measurement of the air volume heat exchange capacity at any time during the life cycle of the outdoor unit 1 of the air conditioner, avoiding unreasonable distribution of the operating load caused by abnormal air volume during operation.

[0051] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , the outdoor unit 1 of the air conditioner includes at least one compressor 15; the controller 13 configures the displacement of each compressor 15, and is configured to obtain the displacements S41 of the compressors 15 of other outdoor units 1 of the multi-connected system that act as slave units when the corresponding outdoor unit 1 of the air conditioner acts as the master unit, and compare the displacements S42 of each compressor 15.

[0052] And when the displacements of each compressor 15 are equal S43, the total operating frequency demand S44 is obtained according to the total load demand; the load distribution coefficient of the outdoor unit 1 of the air conditioner is the frequency distribution coefficient; calculate the frequency distribution coefficient, which is equal to the product of the load upper limit and the heat exchange capacity coefficient.

[0053] The controller 13 of the outdoor unit 1 of the air conditioner acting as the host obtains the frequency distribution coefficient or the load upper limit and the heat exchange capacity coefficient S45 of the outdoor units 1 of the slave units through communication therebetween, and calculates the frequency distribution coefficient S46 from the load upper limit and the heat exchange capacity coefficient. And calculates the operating load of each outdoor unit 1 of the air conditioner; the operating load of each outdoor unit 1 of the air conditioner is respectively equal to the product of the ratio of each frequency distribution coefficient to the sum of the frequency distribution coefficients and the total operating frequency demand S47.

[0054] That is, the load upper limit is the sum of the upper limit frequencies of the compressors 15 of the outdoor unit 1 of the air conditioner; the operating load is the sum of the operating frequencies of the compressors 15 of the outdoor unit 1 of the air conditioner.

[0055] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure � 、 Figure 7 、 Figure 8 ,the outdoor unit 1 of the air conditioner includes at least one compressor 15; the controller 13 is configured with the displacement of each compressor 15, and is configured to obtain the displacement of each compressor 15 of other outdoor units 1 of the multi-split air conditioner system acting as slave units by the outdoor unit 1 of the air conditioner acting as the host S41, and compare the displacements of each compressor 15 S42.

[0056] When the displacements of each compressor 15 are not equal S43, the controller 13 of the outdoor unit 1 of the air conditioner acting as the host sets a reference displacement, and obtains the displacement coefficient of each compressor 15 relative to the reference displacement S48; specifically, the displacement coefficient is equal to the quotient of the compressor 15 displacement divided by the reference displacement; the controller 13 of the host obtains the total operating frequency demand at the reference displacement according to the total load demand S49; obtains the upper limit frequency and the heat exchange capacity coefficient of each compressor 15 of each outdoor unit 1; the controller 13 of the outdoor unit 1 of the air conditioner acting as the host calculates the frequency distribution coefficient of each compressor 15 of each outdoor unit 1, which is equal to the product of the displacement coefficient and the upper limit frequency and the heat exchange capacity coefficient S410; the operating frequency of each compressor 15 is equal to the ratio of each compressor 15 frequency distribution coefficient to the sum of the frequency distribution coefficients and the total operating frequency demand at the reference displacement and divided by the corresponding displacement coefficient S411.

[0057] That is, the load upper limit of the outdoor unit 1 of the air conditioner includes the upper limit frequencies of each compressor 15; the operating load of each outdoor unit 1 of the air conditioner includes the operating frequencies of each compressor 15 of the corresponding outdoor unit 1 of the air conditioner.

[0058] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5, Figure 6 , Figure 7 , Figure 8 , the air conditioner outdoor unit 1 includes at least one compressor 15; the controller 13 is configured with the displacement of each compressor 15, and is configured to obtain the displacement S41 of each compressor 15 of other air conditioner outdoor units 1 acting as slave units in the multi-connected air conditioner system when the corresponding air conditioner outdoor unit 1 acts as the master unit, and compare the displacements S42 of each compressor 15.

[0059] And when the displacements S43 of each compressor 15 are equal, obtain the total operating frequency demand S44 according to the total load demand; the load distribution coefficient of the air conditioner outdoor unit 1 is the frequency distribution coefficient; calculate the frequency distribution coefficient, which is equal to the product of the load upper limit and the heat exchange capacity coefficient.

[0060] The controller 13 of the air conditioner outdoor unit 1 acting as the master unit obtains the frequency distribution coefficient or the load upper limit and the heat exchange capacity coefficient S45 of each slave air conditioner outdoor unit 1 through the communication between them, and calculates the frequency distribution coefficient from the load upper limit and the heat exchange capacity coefficient S46; calculate the operating load of each air conditioner outdoor unit 1; the operating load of each air conditioner outdoor unit 1 is respectively equal to the product of the ratio of each frequency distribution coefficient to the sum of each frequency distribution coefficient and the total operating frequency demand.

[0061] That is, the load upper limit is the sum of the upper limit frequencies of each compressor 15 of the air conditioner outdoor unit 1; the operating load is the sum of the operating frequencies of each compressor 15 of the air conditioner outdoor unit 1.

[0062] When the displacements S43 of each compressor 15 are not equal, the controller 13 of the air conditioner outdoor unit 1 acting as the master unit sets a reference displacement, and obtains the displacement coefficient of each compressor 15 relative to the reference displacement S48; specifically, the displacement coefficient is equal to the quotient of the compressor 15 displacement divided by the reference displacement; the controller 13 of the master unit obtains the total operating frequency demand at the reference displacement according to the total load demand S49; obtains the upper limit frequency and the heat exchange capacity coefficient of each compressor 15 of each air conditioner outdoor unit 1; the controller 13 of the air conditioner outdoor unit 1 acting as the master unit calculates the frequency distribution coefficient of each compressor 15 of each air conditioner outdoor unit 1, which is equal to the product of the displacement coefficient and the upper limit frequency and the heat exchange capacity coefficient S410; the operating frequency of each compressor 15 is equal to the ratio of each compressor 15's frequency distribution coefficient to the sum of each frequency distribution coefficient, the total operating frequency demand at the reference displacement, and divided by the corresponding displacement coefficient S411.

[0063] That is, the load upper limit of the air conditioner outdoor unit 1 includes the upper limit frequencies of each compressor 15; the operating load of each air conditioner outdoor unit 1 includes the operating frequencies of each compressor 15 of the corresponding air conditioner outdoor unit 1.

[0064] 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 outdoor unit 1 of the air conditioner further includes a bypass branch 19, which is connected to the controller 13 and can be controlled by the controller 13 to be connected or cut off; both ends of the bypass branch 19 are respectively connected to and communicated with the exhaust port and the suction port of the compressor 15.

[0065] The outdoor unit 1 of the air conditioner further includes a high-pressure detector 16 and / or a temperature detector 17, and a low-pressure detector 18, which are respectively connected to the controller 13 and are respectively arranged at the exhaust port and the suction port of the compressor 15 for detecting the exhaust pressure, the exhaust temperature, and the suction pressure of the compressor 15 and transmitting them to the controller 13.

[0066] The controller 13 is configured with a high-pressure threshold and / or a temperature threshold, and a low-pressure threshold, and is configured to obtain the exhaust pressure and / or the exhaust temperature during the refrigeration cycle operation, compare the exhaust pressure with the high-pressure threshold and / or the exhaust temperature with the temperature threshold, and when the exhaust pressure exceeds the high-pressure threshold and / or the exhaust temperature exceeds the temperature threshold, control the bypass branch 19 to be connected.

[0067] The controller 13 is configured to obtain the suction pressure during the heating cycle operation, compare the suction pressure with the low-pressure threshold, and when the suction pressure exceeds the low-pressure threshold, control the bypass branch 19 to be connected for pressure relief.

[0068] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , the bypass branch 19 includes a solenoid valve with a controllable opening degree, which is used to control the opening degree of the solenoid valve according to the degree to which the exhaust pressure exceeds the high-pressure threshold and / or the degree to which the exhaust temperature exceeds the temperature threshold, and the degree to which the suction pressure exceeds the low-pressure threshold, so as to control the pressure relief degree.

[0069] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12, the outdoor unit 1 of the air conditioner further includes a high-pressure detector 16 and / or a temperature detector 17, and a low-pressure detector 18, which are respectively connected to the controller 13 and are respectively arranged at the exhaust port and the suction port of the compressor 15 for detecting the exhaust pressure, exhaust temperature, and suction pressure of the compressor 15 and transmitting them to the controller 13.

[0070] The controller 13 is configured with a high-pressure threshold and / or a temperature threshold, and a low-pressure threshold, and is configured to obtain the exhaust pressure and / or exhaust temperature during the refrigeration cycle operation, compare the exhaust pressure with the high-pressure threshold and / or the exhaust temperature with the temperature threshold, and when the exhaust pressure exceeds the high-pressure threshold and / or the exhaust temperature exceeds the temperature threshold, control the compressor 15 to reduce its frequency.

[0071] The controller 13 is configured to obtain the suction pressure during the heating cycle operation, compare the suction pressure with the low-pressure threshold, and when the suction pressure exceeds the low-pressure threshold, control the compressor 15 to reduce its frequency.

[0072] The amplitude of controlling the compressor 15 to reduce its frequency is determined according to the degree to which the exhaust pressure exceeds the high-pressure threshold and / or the degree to which the exhaust temperature exceeds the temperature threshold, and the degree to which the suction pressure exceeds the low-pressure threshold.

[0073] Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , the multi-connected air conditioner system of the present invention includes a plurality of outdoor units 1 of the air conditioner connected by communication and a plurality of indoor units 2 connected by communication, and each outdoor unit 1 of the air conditioner includes a main unit and at least one slave unit, and the main unit is communicatively connected to each indoor unit 2.

[0074] The outdoor unit 1 of the air conditioner includes an outdoor heat exchanger 11, a communication module 14, an air volume coefficient acquisition module 12, and a controller 13.

[0075] The communication module 14 is connected to the controller 13; the controller 13 of each outdoor unit 1 of the air conditioner realizes communication connection and communication with each indoor unit 2 and other outdoor units 1 of the air conditioner through the communication module 14.

[0076] The air volume coefficient acquisition module 12 is connected to the controller 13 for acquiring the air volume coefficient of the outdoor heat exchanger 11 and transmitting it to the controller 13; the air volume coefficient is used to characterize the heat exchange capacity of the outdoor heat exchanger 11 affected by the air volume.

[0077] The controller 13 is configured with the load upper limit of the outdoor unit 1 of the air conditioner and the configuration parameters of the outdoor heat exchanger 11; the load upper limit is the maximum load that the outdoor unit 1 of the air conditioner can provide during normal operation.

[0078] The controller 13 is configured to obtain the heat exchange capacity coefficient of the outdoor heat exchanger 11 according to the configuration parameters and the air volume coefficient, and obtain the load distribution coefficient of the outdoor unit 1 of the air conditioner according to the load upper limit and the heat exchange capacity coefficient.

[0079] The air conditioner outdoor unit 1 serving as the host collects the load demands of each indoor unit 2 and the load distribution coefficients or load upper limits and heat exchange capacity coefficients of each slave unit, obtains the total load demand according to each load demand, and obtains the operating loads of each air conditioner outdoor unit 1 according to the total load demand and the load distribution coefficients of each air conditioner outdoor unit 1 or the load distribution coefficients obtained from the load upper limits and heat exchange capacity coefficients.

[0080] In the multi-connected air conditioner system of the present invention, by taking the influence of the air volume coefficient on the heat exchange capacity of the heat exchanger into account in the distribution of the operating loads of each air conditioner outdoor unit 1 in the multi-connected air conditioner system, when the heat exchange air volume of the outdoor heat exchanger 11 of the air conditioner outdoor unit 1 fails to reach the rated air volume due to installation problems and affects the system operation, it is reflected in the distribution of its operating load, so that even when it operates according to the distributed operating load affected by the installation problem, it can still be consistent or nearly consistent with other unaffected air conditioner outdoor units 1 in terms of system parameters, improving the rationality of the operating load distribution. In addition, while improving the rationality of the operating load distribution, the present invention reduces the probability of overall frequency reduction protection of each compressor 15 of each air conditioner outdoor unit 1 caused by abnormal system parameters of a single air conditioner outdoor unit 1 due to abnormal factors, improving the operating efficiency and operating reliability of the multi-connected air conditioner system.

[0081] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 , the controller 13 of the air conditioner outdoor unit 1 serving as the host is configured to calculate the operating loads of each air conditioner outdoor unit 1 and transmit the obtained operating loads to each slave unit respectively; the host and each slave unit control the operation of each compressor 15 according to the corresponding operating loads respectively.

[0082] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 , the air conditioner outdoor unit 1 includes at least one compressor 15, which respectively corresponds to the same or different upper limit frequencies and is connected to the controller 13 and is controlled by the controller 13.

[0083] The controller 13 is configured such that the load upper limit of the air conditioner outdoor unit 1 includes the upper limit frequencies of each compressor 15; the operating load of the air conditioner outdoor unit 1 includes the operating frequencies of each compressor 15.

[0084] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5, Figure 6 , the configuration parameter of the outdoor heat exchanger 11 configured in the controller 13 is the heat exchanger area; the controller 13 is also configured with the power of the compressor 15, which is the sum of the powers of all the compressors 15 in the air conditioner outdoor unit 1, and is configured such that the heat exchange capacity coefficient is equal to the product of the air volume coefficient and the heat exchange area divided by the power of the compressor 15.

[0085] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , the power of the compressor 15 is the number of horsepower of the air conditioner outdoor unit 1.

[0086] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , each air conditioner outdoor unit 1 in the multi-connected system further includes a control circuit board respectively, which includes a controller 13; the air volume coefficient acquisition module 12 can be implemented by setting a plurality of DIP switches on the control circuit board; different DIP switches or different combinations of DIP switches represent different levels of air volume coefficients; the correspondence between the DIP switches and different levels of air volume coefficients is configured in the controller 13. In addition, by displaying the corresponding installation conditions for different DIP switches or different combinations of DIP switches in the product installation guide document, it is convenient for installers to measure and input, and thus the air volume coefficient acquisition module 12 can acquire the air volume coefficient.

[0087] Of course, the air volume coefficient can also be input through other stepless input methods, such as setting a variable potentiometer in the circuit.

[0088] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , each air conditioner outdoor unit 1 in the multi-connected system further includes a pressure sensor respectively, which is arranged on the outdoor heat exchanger 11, connected to the controller 13, and is used to detect the operating static pressure value and transmit it to the controller 13; the controller 13 obtains the air volume coefficient according to the comparison between the static pressure value corresponding to the rated wind speed and the operating static pressure value.

[0089] The air volume coefficient acquisition module 12 of the outdoor air conditioner 1 of the multi-connected air conditioner system in this embodiment is automatically acquired through a pressure sensor, which improves the accuracy and efficiency. It can also collect and measure the air volume heat exchange capacity of each outdoor air conditioner 1 in the multi-connected air conditioner system at any time during its life cycle, avoiding unreasonable distribution of the operating loads of each outdoor air conditioner 1 in the multi-connected air conditioner system due to abnormal air volume during operation.

[0090] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , each outdoor air conditioner 1 of the multi-connected air conditioner system respectively includes at least one compressor 15, and its controller 13 is configured with the displacement of each compressor 15; the outdoor air conditioner 1 of the host acquires the displacements of the compressors 15 of each other slave outdoor air conditioner 1 in the multi-connected air conditioner system, and compares the displacements of the compressors 15.

[0091] When the displacements of the compressors 15 are equal, the total operating frequency requirement is obtained according to the total load requirement; the load distribution coefficient of the outdoor air conditioner 1 is the frequency distribution coefficient; calculate the frequency distribution coefficient, which is equal to the product of the load upper limit and the heat exchange capacity coefficient.

[0092] The controller 13 of the outdoor air conditioner 1 of the host acquires the upper limit frequency and the heat exchange capacity coefficient or the frequency distribution coefficient of each slave outdoor air conditioner 1 through its communication with the slaves. And calculate the operating loads of each outdoor air conditioner 1; the operating loads of each outdoor air conditioner 1 are respectively equal to the product of the ratio of each frequency distribution coefficient to the sum of the frequency distribution coefficients and the total operating frequency requirement.

[0093] The frequency distribution coefficient of the outdoor air conditioner 1 is equal to the sum of the frequency distribution coefficients of the compressors 15 of the outdoor air conditioner 1; the load upper limit is equal to the sum of the upper limit frequencies of the compressors 15 of the outdoor air conditioner 1; the operating load is the sum of the operating frequencies of the compressors 15 of the outdoor air conditioner 1.

[0094] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , each outdoor air conditioner 1 of the multi-connected air conditioner system respectively includes at least one compressor 15, and its controller 13 is configured with the displacement of each compressor 15; the outdoor air conditioner 1 of the host is configured to acquire the displacements of the compressors 15 of each slave outdoor air conditioner 1 in the multi-connected air conditioner system, and compare the displacements of the compressors 15.

[0095] When the displacements of the compressors 15 are not equal, the controller 13 of the outdoor unit 1 of the main unit sets a reference displacement, calculates the displacement coefficient of each compressor 15 relative to the reference displacement; obtains the total operating frequency requirement at the reference displacement according to the total load requirement; obtains the heat exchange capacity coefficient of each outdoor unit 1 of the air conditioner and the upper limit frequency of each compressor 15; the frequency distribution coefficient of each compressor 15 is respectively equal to the product of the displacement coefficient, the upper limit frequency and the heat exchange capacity coefficient; the operating load of each compressor 15 is respectively equal to the ratio of the frequency distribution coefficient of each compressor 15 to the sum of the frequency distribution coefficients of each compressor 15 multiplied by the total operating frequency requirement at the reference displacement and divided by the corresponding displacement coefficient.

[0096] The load upper limit of the outdoor unit 1 of the air conditioner includes the upper limit frequency of each compressor 15; the operating load of each outdoor unit 1 of the air conditioner includes the operating frequency of each compressor 15 corresponding to each outdoor unit 1 of the air conditioner.

[0097] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 ,each outdoor unit 1 of the multi-connected air-conditioning system respectively includes at least one compressor 15, and its controller 13 is configured with the displacement of each compressor 15; the outdoor unit 1 of the main unit of the air conditioner obtains the displacements of each compressor 15 of other slave outdoor units 1 in the multi-connected air-conditioning system and compares the displacements of each compressor 15.

[0098] When the displacements of the compressors 15 are equal, the total operating frequency requirement is obtained according to the total load requirement; the load distribution coefficient of the outdoor unit 1 of the air conditioner is the frequency distribution coefficient; calculate the frequency distribution coefficient, which is equal to the product of the load upper limit and the heat exchange capacity coefficient.

[0099] The controller 13 of the outdoor unit 1 of the main unit of the air conditioner obtains the upper limit frequency, the heat exchange capacity coefficient or the frequency distribution coefficient of each outdoor unit 1 of the slave unit through its communication with the slave unit. And calculate the operating load of each outdoor unit 1 of the air conditioner; the operating load of each outdoor unit 1 of the air conditioner is respectively equal to the product of the ratio of each frequency distribution coefficient to the sum of each frequency distribution coefficient and the total operating frequency requirement.

[0100] The frequency distribution coefficient of the outdoor unit 1 of the air conditioner is equal to the sum of the frequency distribution coefficients of each compressor 15 of the outdoor unit 1 of the air conditioner; the load upper limit is equal to the sum of the upper limit frequencies of each compressor 15 of the outdoor unit 1 of the air conditioner; the operating load is the sum of the operating frequencies of each compressor 15 of the outdoor unit 1 of the air conditioner.

[0101] When the displacements of the compressors 15 are not equal, the controller 13 of the air conditioner outdoor unit 1 of the main unit sets a reference displacement, calculates the displacement coefficient of the displacement of each compressor 15 relative to the reference displacement; obtains the total operating frequency requirement at the reference displacement according to the total load requirement; obtains the heat exchange capacity coefficient of each air conditioner outdoor unit 1 and the upper limit frequency of each compressor 15; the frequency distribution coefficient of each compressor 15 is respectively equal to the product of the displacement coefficient, the upper limit frequency and the heat exchange capacity coefficient; the operating load of each compressor 15 is respectively equal to the ratio of the frequency distribution coefficient of each compressor 15 to the sum of the frequency distribution coefficients of each compressor 15 multiplied by the total operating frequency requirement at the reference displacement and divided by the corresponding displacement coefficient.

[0102] The load upper limit of the air conditioner outdoor unit 1 includes the upper limit frequencies of the compressors 15; the operating loads of each air conditioner outdoor unit 1 include the operating frequencies of the compressors 15 corresponding to each air conditioner outdoor unit 1.

[0103] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 , the displacements of the compressors 15 in the same air conditioner outdoor unit 1 in the multi-connected air conditioner system are the same and the upper limit frequencies are the same.

[0104] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 , each air conditioner outdoor unit 1 of the multi-connected air conditioner further includes at least one bypass branch 19, which is connected to the controller 13 and can be controlled by the controller 13 to be connected or cut off; both ends of the bypass branch 19 are respectively connected to and communicate with the exhaust port and the suction port of the compressor 15.

[0105] The air conditioner outdoor unit 1 further includes a high-pressure detector 16 and / or a temperature detector 17 and a low-pressure detector 18, which are respectively connected to the controller 13 and are respectively arranged at the exhaust port and the suction port of the compressor 15 for detecting the exhaust pressure, exhaust temperature and suction pressure of the compressor 15 and transmitting them to the controller 13.

[0106] The controller 13 is configured with a high - pressure threshold and / or a temperature threshold, a low - pressure threshold, and is configured to obtain the exhaust pressure and / or exhaust temperature during the refrigeration cycle operation, compare the exhaust pressure with the high - pressure threshold and / or the exhaust temperature with the temperature threshold, and when the exhaust pressure exceeds the high - pressure threshold and / or the exhaust temperature exceeds the temperature threshold, control the bypass branch 19 to be connected.

[0107] The controller 13 is configured to obtain the suction pressure during the heating cycle operation, compare the suction pressure with the low - pressure threshold, and when the suction pressure exceeds the low - pressure threshold, control the bypass branch 19 to be connected for pressure relief.

[0108] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 , the bypass branch 19 includes a solenoid valve with a controllable opening degree, which is used to control the opening degree of the solenoid valve according to the degree to which the exhaust pressure exceeds the high - pressure threshold and / or the degree to which the exhaust temperature exceeds the temperature threshold, and the degree to which the suction pressure exceeds the low - pressure threshold, so as to control the pressure relief degree.

[0109] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 ​ 、 ​ 、 ​ 、 ​ 、 ​ 、 ​ 、 ​ 、 ​ 、 ​ , each outdoor air conditioner 1 of the multi - split air conditioner further includes a high - pressure detector 16 and / or a temperature detector 17, a low - pressure detector 18 respectively, which are respectively connected to the controller 13 and are respectively arranged at the exhaust port and the suction port of the compressor 15 for detecting the exhaust pressure, exhaust temperature, and suction pressure of the compressor 15 and transmitting them to the controller 13.

[0110] The controller 13 is configured with a high - pressure threshold and / or a temperature threshold, a low - pressure threshold, and is configured to obtain the exhaust pressure and / or exhaust temperature during the refrigeration cycle operation, compare the exhaust pressure with the high - pressure threshold and / or the exhaust temperature with the temperature threshold, and when the exhaust pressure exceeds the high - pressure threshold and / or the exhaust temperature exceeds the temperature threshold, control the compressor 15 to reduce its frequency.

[0111] The controller 13 is configured to obtain the suction pressure during the heating cycle operation, compare the suction pressure with the low - pressure threshold, and when the suction pressure exceeds the low - pressure threshold, control the compressor 15 to reduce its frequency.

[0112] The amplitude of the compressor 15's frequency reduction is determined according to the degree to which the exhaust pressure exceeds the high-pressure threshold and / or the degree to which the exhaust temperature exceeds the temperature threshold, and the degree to which the suction pressure exceeds the low-pressure threshold.

[0113] In the description of the above embodiments, the specific features, structures, materials, or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0114] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An outdoor unit of an air conditioner, which is applied to a multi-connected air conditioner system including a plurality of the outdoor units of the air conditioner and a plurality of indoor units, and can be a main unit or a slave unit; in the multi-connected air conditioner system, the outdoor units of the air conditioner are communicatively connected to each other and communicatively connected to each of the indoor units; It is characterized in that Comprising: An outdoor heat exchanger; An air volume coefficient acquisition module, which is used to acquire the air volume coefficient of the outdoor heat exchanger; the air volume coefficient characterizes the heat exchange capacity of the outdoor heat exchanger affected by the air volume; A controller, which is configured with a load upper limit and configuration parameters of the outdoor heat exchanger, is connected to the air volume coefficient acquisition module, receives the air volume coefficient, and acquires a heat exchange capacity coefficient of the outdoor heat exchanger according to the configuration parameters and the air volume coefficient; the controller of the main unit acquires the load demands of each of the indoor units, the load upper limit of the slave unit, and the heat exchange capacity coefficient, and obtains the operating loads of the outdoor units of the air conditioner according to each of the load demands, each of the load upper limits, and each of the heat exchange capacity coefficients.

2. The air conditioner outdoor unit according to claim 1, characterized in that, Comprising at least one compressor, which respectively corresponds to the same or different upper limit frequencies and is respectively connected to the controller; the controller is configured such that the load upper limit includes at least one of the upper limit frequencies; The operating load of the outdoor unit of the air conditioner includes the operating frequencies of the compressors.

3. The air conditioner outdoor unit according to claim 2, characterized in that, The configuration parameter is the heat exchanger area; the controller is further configured with a compressor power, and is configured such that the heat exchange capacity coefficient is equal to the product of the air volume coefficient and the heat exchanger area divided by the compressor power.

4. The air conditioner outdoor unit according to claim 3, characterized in that, The controller is configured with at least one compressor displacement; the controller of the main unit is configured to acquire the compressor displacements of the outdoor units of the air conditioner and compare the compressor displacements; When the compressor displacements are equal, a total operating frequency demand is obtained according to the sum of the load demands; the frequency distribution coefficients of the outdoor units of the air conditioner are calculated, which are equal to the product of the load upper limit and the heat exchange capacity coefficient; Each of the operating loads is respectively equal to the product of the ratio of each of the frequency distribution coefficients to the sum of the frequency distribution coefficients and the total operating frequency demand.

5. The air conditioner outdoor unit according to claim 3 or 4, characterized in that, The controller is configured with at least one compressor displacement; the controller of the main unit is configured to acquire the compressor displacements of the outdoor units of the air conditioner and compare the compressor displacements; When the displacements are not equal, a reference displacement is set, and a total operating frequency demand is obtained according to the load demands; According to the reference displacement and the compressor displacements, displacement coefficients of the compressor displacements relative to the reference displacement are obtained; the frequency distribution coefficients of the compressors are calculated, which are equal to the product of the displacement coefficient, the upper limit frequency, and the heat exchange capacity coefficient; Each of the operating frequencies is respectively equal to the product of the ratio of each of the frequency distribution coefficients to the sum of the frequency distribution coefficients and the total operating frequency demand divided by the corresponding displacement coefficient.

6. The air conditioner outdoor unit according to claim 5, characterized in that, Further comprising at least one bypass branch, which is connected to the controller, can be controllably communicated or cut off, and both ends are respectively connected to and communicated with the exhaust port and the suction port of the compressor; It further includes a high-pressure detector and / or a temperature detector, and a low-pressure detector, which are respectively connected to the controller and used to detect the discharge pressure, discharge temperature, and suction pressure of the compressor and transmit them to the controller; the controller is configured with a high-pressure threshold, a low-pressure threshold, and a temperature threshold, and is configured to compare the discharge pressure with the high-pressure threshold and / or the discharge temperature with the temperature threshold, or the suction pressure with the low-pressure threshold, and when the discharge pressure exceeds the high-pressure threshold and / or the discharge temperature exceeds the temperature threshold, or the suction pressure exceeds the low-pressure threshold, control the bypass branch to be connected or control each compressor to reduce its frequency.

7. A multi-connected air conditioner system, characterized in that, It includes a plurality of air conditioner outdoor units and a plurality of indoor units; each of the air conditioner outdoor units is respectively a main unit and at least one slave unit, which are communicatively connected and communicatively connected to each of the indoor units; The air conditioner outdoor unit includes an outdoor heat exchanger, a controller, and an air volume coefficient acquisition module for acquiring the air volume coefficient of the outdoor heat exchanger; the air volume coefficient characterizes the heat exchange capacity of the outdoor heat exchanger affected by the air volume. The controller is configured with a load upper limit and configuration parameters of the outdoor heat exchanger, is connected to the air volume coefficient acquisition module, receives the air volume coefficient, and obtains a heat exchange capacity coefficient according to the configuration parameters and the air volume coefficient; the controller of the main unit acquires the load demands of each indoor unit, the load upper limits of each slave unit, and the heat exchange capacity coefficient, and obtains the operating loads of each air conditioner outdoor unit according to each load upper limit, each load upper limit, and each heat exchange capacity coefficient.

8. The multi-connected air conditioner system according to claim 7, wherein The air conditioner outdoor unit includes at least one compressor, which respectively corresponds to the same or different upper frequencies and is respectively connected to the controller; The controller is configured such that the load upper limit includes at least one of the upper frequencies; the operating load of the air conditioner outdoor unit includes the operating frequencies of at least one of the compressors; The configuration parameter is the heat exchanger area; the controller is further configured with a compressor power, and is configured such that the heat exchange capacity coefficient is equal to the product of the air volume coefficient and the heat exchanger area divided by the compressor power.

9. The multi-connected air conditioner system according to claim 8, wherein The controller is configured with at least one compressor displacement; the controller of the main unit is configured to acquire the compressor displacements of each air conditioner outdoor unit and compare the compressor displacements; When the compressor displacements are equal, obtain the total operating frequency demand according to each load demand; calculate the frequency distribution coefficient of each air conditioner outdoor unit, which is equal to the product of each load upper limit and the heat exchange capacity coefficient; Each of the operating loads is respectively equal to the product of the ratio of each frequency distribution coefficient to the sum of each frequency distribution coefficient and the total operating frequency demand; When the compressor displacements are not equal, set a reference displacement; Obtain the total operating frequency demand according to each load demand; Obtain the displacement coefficients of each compressor displacement relative to the reference displacement according to the reference displacement and each compressor displacement; calculate the frequency distribution coefficient of each compressor, which is equal to the product of the displacement coefficient, the upper frequency, and the heat exchange capacity coefficient. Each of the operating frequencies is respectively equal to the product of the ratio of each of the frequency distribution coefficients to the sum of the frequency distribution coefficients and the total operating frequency requirement, divided by the corresponding displacement coefficient.

10. The multi-connected air conditioner system according to any one of claims 7 to 9, characterized in that, The outdoor air conditioner further includes at least one bypass branch, which is connected to the controller, controllably connected or cut off, and both ends are respectively connected and communicated with the exhaust port and the suction port of the compressor; The outdoor air conditioner further includes a high-pressure detector and / or a temperature detector, a low-pressure detector, which are respectively connected to the controller and used to detect the exhaust pressure, exhaust temperature, and suction pressure of the compressor and transmit them to the controller; the controller is configured with a high-pressure threshold, a low-pressure threshold, and a temperature threshold, and is configured to compare the exhaust pressure with the high-pressure threshold and / or the exhaust temperature with the temperature threshold, or the suction pressure with the low-pressure threshold, and when the exhaust pressure exceeds the high-pressure threshold and / or the exhaust temperature exceeds the temperature threshold, or the suction pressure exceeds the low-pressure threshold, control the bypass branch to be connected or control the outdoor air conditioner to reduce the frequency.

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