Distributed air conditioner control method, device and system and air conditioner

Abstract

The invention discloses a distributed air conditioner control method, device and system and an air conditioner, and belongs to the field of air conditioner control. When the first temperature difference value between the user set value and the outdoor temperature is obtained, the opening number of the flow paths is determined according to the first temperature difference value, and finally the flow paths are controlled based on the opening number of the flow paths. Therefore, whether the refrigerant passes through one flow path or not does not affect whether other refrigerants flow through other flow paths or not. In this way, when the target capacity is low, at least one flow path can be selectively closed, part of the refrigerant is stored in the closed flow path of the evaporator, the refrigerant does not participate in system circulation, the minimum capacity of the air conditioner is reduced, and under the condition that the minimum operation frequency of the air conditioner is not reduced, stable operation of a unit is guaranteed, and the reliability and comfort of the unit are improved; and meanwhile, energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the field of air conditioning control, and in particular, to a distributed air conditioning control method, device, system and air conditioner. Background Art

[0002] With the development of society, living conditions are constantly improving, and the insulation effect of houses has also been greatly improved, which has greatly reduced the capacity loss caused by heat leakage in the building maintenance structure and improved the energy efficiency of buildings. Therefore, under the same conditions, the demand for air conditioning capacity has been reduced. In addition, when consumers purchase air conditioners, in order to ensure the cooling effect of the target area, they usually choose air conditioners with a capacity slightly larger than the actual demand. In actual use, when the target capacity is low, the variable frequency air conditioner will maintain operation at a low frequency point.

[0003] To prevent refrigerant backflow, abnormal vibration, and insufficient compressor lubrication, the inverter will set the minimum operating frequency to ensure stable operation of the unit. However, when the target capacity is too low, even if the air conditioner is running at the lowest frequency point, it will start and stop frequently due to reaching the set temperature. Frequent start and stop of the compressor will reduce its comfort, consume a lot of electricity, increase the impact on components, and is not conducive to long-term reliable operation and energy-saving operation of the unit. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present application provides a distributed air conditioning control method, device, system and air conditioner to solve the problem that when the target capacity is too low, even if the air conditioner is running at the lowest frequency point, the air conditioner will start and stop frequently due to reaching the set temperature. Frequent start and stop of the compressor will reduce its comfort, consume a lot of electricity, increase the impact on components, and be detrimental to the long-term reliable operation and energy-saving operation of the unit.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] In a first aspect, a distributed air conditioner control method is provided, wherein the distributed air conditioner includes an evaporator, wherein N flow paths are arranged in the evaporator, and any two flow paths are arranged in parallel with each other, wherein N is a positive integer and N≥2; the method includes:

[0007] Get user set value and outdoor temperature;

[0008] Calculating a first temperature difference between the outdoor temperature and the user-set value;

[0009] determining the opening quantity of the flow path based on the first temperature difference;

[0010] The opening of the flow path is controlled according to the opening quantity of the flow path.

[0011] Further, determining the opening quantity of the flow path based on the first temperature difference includes:

[0012] When the first temperature difference is greater than or equal to a first preset temperature difference and less than or equal to a second preset temperature difference, calculating the subcooling degree of the evaporator;

[0013] The opening number of the flow paths is determined based on the degree of subcooling.

[0014] Further, determining the opening number of the flow paths based on the subcooling degree includes:

[0015] If the degree of supercooling is greater than or equal to a first preset degree of supercooling, the number of openings of the flow paths is determined according to the user-set temperature and the indoor temperature.

[0016] Further, the determining the opening quantity of the flow path according to the user set temperature and the indoor temperature includes:

[0017] Obtaining a unit temperature difference corresponding to the cooling capacity of the flow path;

[0018] Acquire a second temperature difference between the indoor temperature and the user set temperature;

[0019] Calculating a ratio of the second temperature difference to the unit temperature difference;

[0020] The opening number of the flow path is determined according to the ratio, and the opening number is the ratio, or the opening number is the smallest integer greater than the ratio.

[0021] Further, determining the opening number of the flow paths based on the subcooling degree includes:

[0022] If the degree of subcooling is less than a first preset degree of subcooling, the number of open flow paths is determined to be N.

[0023] Further, determining the opening quantity of the flow path based on the first temperature difference includes:

[0024] When the first temperature difference is less than a first preset temperature difference, it is determined that the number of open channels is one.

[0025] Further, determining the opening quantity of the flow path based on the first temperature difference includes:

[0026] When the first temperature difference is greater than the second preset temperature difference, it is determined that the number of open flow paths is N.

[0027] In a second aspect, a distributed air conditioning control device is provided, the distributed air conditioning comprising an evaporator, wherein N flow paths are arranged in the evaporator, and any two flow paths are arranged in parallel with each other, wherein N is a positive integer and N≥2; the device comprises:

[0028] Parameter acquisition module, used to obtain user set values ​​and outdoor temperature;

[0029] A difference calculation module, used for calculating a first temperature difference between the outdoor temperature and the user-set value;

[0030] a quantity determination module, configured to determine the opening quantity of the flow paths based on the first temperature difference;

[0031] A flow path control module is used to control the opening of the flow path according to the opening quantity of the flow path.

[0032] In a third aspect, a distributed air conditioning control system is provided, comprising:

[0033] at least one processor and at least one memory;

[0034] The memory stores executable instructions of the processor;

[0035] The processor is configured to execute the above-mentioned distributed air-conditioning control method.

[0036] In a fourth aspect, an air conditioner is provided, applying the above-mentioned distributed air conditioning control method.

[0037] Beneficial effects:

[0038] The technical solution of the present application provides a distributed air conditioning control method, device, system and air conditioner; when the first temperature difference between the user set value and the outdoor temperature is obtained, the number of flow paths opened is determined according to the first temperature difference, and finally the flow paths are controlled based on the number of flow paths opened. Since multiple flow paths are arranged in one evaporator and are arranged in parallel with each other, whether the refrigerant passes through one flow path does not affect whether other refrigerants flow through other flow paths. In this way, when the target capacity is low, at least one of the flow paths can be closed, and part of the refrigerant can be stored in the closed flow path of the evaporator so that it does not participate in the system circulation, reducing the minimum capacity of the air conditioner. Without reducing the minimum operating frequency of the air conditioner, the unit can be ensured to operate smoothly, improve the unit reliability and comfort, and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 This is a schematic diagram of a distributed air conditioning structure provided by an embodiment of the present application;

[0041] Figure 2 is another schematic diagram of a distributed air conditioning structure provided in an embodiment of the present application;

[0042] Figure 3 is a flow chart of a distributed air conditioning control method provided in an embodiment of the present application;

[0043] Figure 4 is a specific flow chart of a distributed air conditioning control method provided in an embodiment of the present application;

[0044] Figure 5 It is a structural schematic diagram of a distributed air conditioning control device provided in an embodiment of the present application;

[0045] Figure 6 It is a schematic diagram of the structure of a distributed air-conditioning control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application is described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation methods obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0047] like Figure 1 or Figure 2 The distributed air conditioner includes a compressor, an evaporator, an electronic expansion valve (EXV in the figure), a condenser, and a fan arranged at the condenser. Some models are equipped with a gas-liquid separator and a four-way valve. The specific connection method is not improved in this application and will not be described in detail here.

[0048] The difference from the existing structure is that multiple independent flow paths are set in the evaporator, and any two flow paths are set in parallel. The parallel setting means that the state of one flow path will not affect the state of another flow path. Specifically, a solenoid valve can be set for each flow path. The following is an explanation of two flow paths.

[0049] Two independent flow paths: a first flow path and a second flow path. The first flow path is provided with a solenoid valve 1. When the solenoid valve 1 is opened, the refrigerant can flow through the first flow path. When it is closed, the refrigerant remains in the first flow path and does not participate in the refrigerant circulation of the system. The second flow path is provided with a solenoid valve 2. When the solenoid valve 2 is opened, the refrigerant can flow through the second flow path. When it is closed, the refrigerant remains in the second flow path and does not participate in the refrigerant circulation of the system.

[0050] The first flow path and the second flow path can be as follows Figure 1 As described above, they are respectively arranged in different areas of the evaporator. Figure 2 As described above, the two are arranged in the same area of ​​the evaporator.

[0051] Preferably, a tube temperature sensing package 1 is provided on the first flow path to measure the tube temperature of the first flow path. A tube temperature sensing package 2 is provided on the second flow path to measure the tube temperature of the second flow path.

[0052] The distributed air conditioner provided in the embodiment of the present application can control the refrigerant flow in the evaporator through solenoid valve 1 and solenoid valve 2, thereby changing the refrigerant circulation volume in the system. When the target capacity is low, one of the flow paths can be closed to reduce the system cooling capacity and avoid frequent system start and stop.

[0053] Reference Figure 3 The embodiment of the present application provides a distributed air conditioning control method. The distributed air conditioning, as shown in the above embodiment, includes an evaporator, wherein N flow paths are arranged in the evaporator, and any two flow paths are arranged in parallel with each other, wherein N is a positive integer and N≥2; the method includes:

[0054] S11: Obtaining a user set value and an outdoor temperature; the user set value is the indoor temperature set by the user, and the outdoor temperature is obtained by a sensor installed outdoors.

[0055] S12: Calculate the first temperature difference between the outdoor temperature and the user set value; first temperature difference = outdoor temperature - user set value. Since the present application is to solve the problem of cooling, the general application scenario is that the outdoor temperature is higher and the user set temperature is lower.

[0056] S13: Determine the opening number of the flow paths based on the first temperature difference.

[0057] Exemplarily, when N=2, the number of openings of the first flow path and the second flow path is determined based on the first temperature difference.

[0058] Among them, the difference between the outdoor temperature and the user-set value is used because after the air conditioner is running, when the indoor temperature reaches or approaches the user-set value, the prior art controls the compressor to stop. At this time, the difference between the outdoor temperature and the indoor temperature is approximately equal to the difference between the outdoor temperature and the user-set value, and the difference between the outdoor temperature and the indoor temperature can reflect the target capacity of the air conditioner required later. Since the compressor is shut down, the air conditioner no longer affects the indoor temperature, and only the outdoor temperature will cause the indoor temperature to rise. The greater the difference between the outdoor temperature and the indoor temperature, the faster the rise, and the compressor needs to be restarted in a short time. Therefore, the present application determines the current opening state of the first flow path and the second flow path based on the first temperature difference.

[0059] The determining the opening quantity of the first flow path and the second flow path based on the first temperature difference includes:

[0060] When the first temperature difference is less than the first preset temperature difference, it is determined that the number of the first flow path and the second flow path opened is one, which means that the outdoor temperature has little effect on the indoor temperature, the cooling demand is small, and the full cooling capacity is not needed, so only one of them needs to be opened.

[0061] When the first temperature difference is greater than the second preset temperature difference, it is determined that both the first flow path and the second flow path are opened. At this time, the outdoor temperature has a greater impact on the indoor temperature, and the cooling demand is large. If only one flow path is opened, it is likely that the indoor temperature cannot be changed, so both the first flow path and the second flow path need to be opened.

[0062] When the first temperature difference is greater than or equal to the first preset temperature difference and less than or equal to the second preset temperature difference, the subcooling degree of the evaporator is calculated; and the opening quantity of the first flow path and the second flow path is determined based on the subcooling degree. When the first temperature difference is greater than or equal to the first preset temperature difference and less than or equal to the second preset temperature difference, it means that the cooling demand is moderate at this time, and the subcooling degree of the evaporator represents the cooling capacity of the air conditioner. The lower the subcooling degree, the smaller the current cooling capacity of the air conditioner.

[0063] As a preferred implementation method of the embodiment of the present application, the present application adopts the tube temperature of the evaporator to represent the degree of subcooling.

[0064] In one embodiment, the temperature obtained by a temperature sensor disposed at a preset position on the evaporator represents the degree of supercooling. The preset position is set according to actual needs.

[0065] However, if the first flow path and the second flow path in the evaporator are Figure 1When the temperature measured by a single temperature sensor is set, it cannot effectively represent the cooling capacity of the air conditioner. Therefore, in another embodiment of the present application, a temperature sensor is set in the first flow path and the second flow path respectively, and then the average value of the temperatures detected by the two sensors is taken as the supercooling degree.

[0066] Of course, in practice, multiple temperature sensors may be arranged on the evaporator, and then an average value is taken as the supercooling degree, without the need to arrange them according to the positions of the first flow path and the second flow path.

[0067] Therefore, if the supercooling degree is less than the first preset supercooling degree, it is determined that both the first flow path and the second flow path are opened. The supercooling degree is less than the first preset supercooling degree, which means that the refrigeration capacity of the air conditioner is low at this time, and the refrigeration capacity of opening only one flow path cannot meet the demand, so both the first flow path and the second flow path need to be opened.

[0068] If the supercooling degree is greater than or equal to the first preset supercooling degree, the number of openings of the first flow path and the second flow path is determined according to the user-set temperature and the indoor temperature. If the supercooling degree is greater than or equal to the first preset supercooling degree, it means that the air conditioner has a strong cooling capacity at this time, and it is possible that only one flow path can be opened. However, further judgment is required.

[0069] In one embodiment, if the cooling capacity of the first flow path and the second flow path is the same, that is, the pipe length, material, etc. of the first flow path and the second flow path are exactly the same, then the cooling capacity of the first flow path and the second flow path is half of the cooling capacity of the entire air conditioner. At this time, it is only necessary to determine how much the cooling demand is based on the second temperature difference between the outdoor temperature and the indoor temperature. In order to simplify the control, the application sets a corresponding relationship between the cooling capacity and the temperature difference. As long as the second temperature difference is less than or equal to the temperature difference corresponding to half of the cooling capacity of the whole machine, it is determined that only one flow path can be opened, and when it is greater, both need to be opened.

[0070] In another embodiment, when the cooling capacities corresponding to the first flow path and the second flow path are different,

[0071] respectively obtaining a first cooling capacity of the first flow path and a second cooling capacity of the second flow path, and taking the larger of the first cooling capacity and the second cooling capacity as the maximum cooling capacity;

[0072] Determine a first target temperature difference based on the maximum cooling capacity, wherein the greater the maximum cooling capacity, the greater the first target temperature difference;

[0073] When a second temperature difference between the indoor temperature and the user set temperature is greater than the first target temperature difference, it is determined that the opening quantities of the first flow path and the second flow path are both opened.

[0074] taking the smaller of the first refrigeration capacity and the second refrigeration capacity as the minimum refrigeration capacity;

[0075] Determine a second target temperature difference based on the minimum cooling capacity, wherein the greater the minimum cooling capacity, the greater the second target temperature difference;

[0076] When the second temperature difference between the indoor temperature and the user-set temperature is less than the second target temperature difference, it is determined that one of the first flow path and the second flow path is opened as open and the other is closed; when the second temperature difference between the indoor temperature and the user-set temperature is greater than or equal to the second target temperature difference and less than or equal to the first target temperature difference, it is determined that the opening number of the target flow path among the first flow path and the second flow path is opened as open, and the opening number of the other flow path is closed, wherein the target flow path is the flow path corresponding to the maximum cooling capacity.

[0077] When N≥3, the number of open channels is determined based on the first temperature difference.

[0078] Among them, the difference between the outdoor temperature and the user-set value is used because after the air conditioner is running, when the indoor temperature reaches or approaches the user-set value, the prior art controls the compressor to stop. At this time, the difference between the outdoor temperature and the indoor temperature is approximately equal to the difference between the outdoor temperature and the user-set value, and the difference between the outdoor temperature and the indoor temperature can reflect the target capacity of the air conditioner required later. Since the compressor is shut down, the air conditioner no longer affects the indoor temperature, and only the outdoor temperature will cause the indoor temperature to rise. The greater the difference between the outdoor temperature and the indoor temperature, the faster the rise, and the compressor needs to be restarted in a short time. Therefore, this application determines the number of flow path openings based on the first temperature difference.

[0079] The determining the opening quantity of the flow path based on the first temperature difference comprises:

[0080] When the first temperature difference is less than the first preset temperature difference, it is determined that the number of open channels is one, which indicates that the outdoor temperature has little effect on the indoor temperature, the cooling demand is small, and only one of the channels can be opened to meet the cooling demand.

[0081] When the first temperature difference is greater than the second preset temperature difference, the number of open channels is determined to be N. At this time, the outdoor temperature has a greater impact on the indoor temperature, and the cooling demand is large. If only some channels are opened, the indoor temperature may not be changed, so all channels need to be opened.

[0082] When the first temperature difference is greater than or equal to the first preset temperature difference and less than or equal to the second preset temperature difference, the subcooling degree of the evaporator is calculated; and the opening number of the flow path is determined based on the subcooling degree. When the first temperature difference is greater than or equal to the first preset temperature difference and less than or equal to the second preset temperature difference, it means that the cooling demand is moderate at this time, and the subcooling degree of the evaporator represents the cooling capacity of the air conditioner. The lower the subcooling degree, the smaller the current cooling capacity of the air conditioner.

[0083] As a preferred implementation method of the embodiment of the present application, the present application adopts the tube temperature of the evaporator to represent the degree of subcooling.

[0084] In one embodiment, the temperature obtained by a temperature sensor disposed at a preset position on the evaporator represents the degree of supercooling. The preset position is set according to actual needs.

[0085] However, if each flow path in the evaporator is only set at one position in the evaporator, the temperature measured by a single temperature sensor cannot represent the actual supercooling degree of the evaporator at this time, and thus cannot effectively represent the refrigeration capacity of the air conditioner. Therefore, in another embodiment of the present application, a temperature sensor is set in each flow path, and then the average value of the temperatures detected by all sensors is taken as the supercooling degree.

[0086] Of course, in practice, multiple temperature sensors can be set on the evaporator, and then the average value is taken as the subcooling degree, without setting it according to the position of each flow path.

[0087] Therefore, if the supercooling degree is less than the first preset supercooling degree, the number of the flow paths to be opened is determined to be N. The supercooling degree is less than the first preset supercooling degree, which means that the air conditioner has a low refrigeration capacity, and only part of the flow paths are opened, and the overall refrigeration capacity cannot meet the refrigeration demand. Therefore, all flow paths need to be opened.

[0088] If the supercooling degree is greater than or equal to the first preset supercooling degree, the number of flow paths to be opened is determined according to the user set temperature and the indoor temperature. If the supercooling degree is greater than or equal to the first preset supercooling degree, it means that the air conditioner has a strong cooling capacity at this time, and it is possible that only part of the flow paths can be opened to meet the cooling demand. Therefore, further judgment is required.

[0089] Wherein, determining the opening quantity of the flow path according to the user set temperature and the indoor temperature includes:

[0090] Obtain a unit temperature difference corresponding to the cooling capacity of the flow path; wherein, when the cooling capacity of any two flow paths is the same, the unit temperature difference is the temperature difference corresponding to the cooling capacity of any one flow path, and the corresponding relationship is obtained based on experiments. When there is no situation where the cooling capacity of any two flow paths is the same, the unit temperature difference is the ratio of the sum of the cooling capacities of all flow paths to N. That is, the unit temperature difference represents the average cooling capacity of a single flow path.

[0091] The second temperature difference between the indoor temperature and the user set temperature is obtained; the second temperature difference = indoor temperature - user set temperature. The second temperature difference represents the total cooling demand.

[0092] Calculate the ratio of the second temperature difference to the unit temperature difference; determine the number of openings of the flow path according to the ratio, the number of openings is the ratio, or the number of openings is the smallest integer greater than the ratio. When the cooling capacity of each flow path is the same, if the ratio is an integer, the number of openings is the ratio, if the ratio is not an integer, the number of openings is the integer of the ratio + 1, that is, the number of openings is the smallest integer greater than the ratio. When there is no situation where the cooling capacity of any two flow paths is the same, the number of openings can be determined based on the cooling capacity of each flow path and the total cooling demand. For example, the cooling capacity is sorted from small to large, or from large to small, and the number of openings is determined according to the sorting.

[0093] S14: Controlling the opening of the flow path according to the opening quantity of the flow path.

[0094] When only part of the flow paths are opened and the opened flow paths are replaced by unopened flow paths (i.e., at least one currently opened flow path is closed and at least one currently unopened flow path is opened), and the current cooling demand can still be met, switching can be performed at regular intervals to avoid a single flow path working for a long time, thereby extending the overall use time of the flow path.

[0095] The distributed air conditioning control method provided in the embodiment of the present application determines the number of flow paths to be opened according to the first temperature difference when obtaining the first temperature difference between the user set value and the outdoor temperature, and finally controls the flow paths based on the number of flow paths to be opened. Since multiple flow paths are arranged in one evaporator and are arranged in parallel with each other, whether the refrigerant passes through one flow path does not affect whether other refrigerants flow through other flow paths. In this way, when the target capacity is low, at least one of the flow paths can be closed, and part of the refrigerant can be stored in the closed flow path of the evaporator so that it does not participate in the system circulation, reducing the minimum capacity of the air conditioner. Without reducing the minimum operating frequency of the air conditioner, the unit can be ensured to operate smoothly, improve the reliability and comfort of the unit, and reduce energy consumption.

[0096] In order to more clearly illustrate the solution of the present application, the present application also provides a specific distributed air conditioning control method, wherein the evaporator of the distributed air conditioning includes two flow paths, such as Figure 4 As shown, the specific control method is as follows:

[0097] (1) After startup, the compressor will run for 5 minutes according to normal logic. That is, after startup, the compressor will run according to the preset initial frequency.

[0098] (2) Calculate the target cooling capacity q. After running for 5 minutes, the target frequency needs to be determined based on the indoor temperature and the user setting value. The target cooling capacity q value is related to the difference between the target frequency and the initial frequency. Since the initial frequency is fixed, it is related to the difference between the indoor temperature and the user set temperature.

[0099] (3) Calculate the maximum cooling capacity under the current environment Q = k (azt), where k is the compressor cooling coefficient; a is the cooling capacity of a single compressor; z is the ambient temperature correction coefficient; and t is the ambient temperature.

[0100] (4) Determine whether the first temperature difference between the outdoor temperature and the user-set value is greater than T1 (i.e., the second preset temperature difference). If not, execute (5); otherwise, execute (6).

[0101] (5) Adjust solenoid valve 1 and solenoid valve 2 so that both solenoid valve 1 and solenoid valve 2 are in the open state.

[0102] (6) Determine whether the first temperature difference between the outdoor temperature and the user-set value is < T2 (i.e., the first preset temperature difference, T2 < T1). If so, execute (7); otherwise, execute (8).

[0103] (7) Close solenoid valve 1 and open solenoid valve 2, and switch the on and off solenoid valves every 2 hours. That is, switch the on and off states of solenoid valves 1 and 2 every 2 hours.

[0104] (8) Determine whether the average subcooling value t is less than T3, where t = (t1 + t2) / 2, t1 and t2 are the tube temperatures corresponding to the first flow path and the second flow path of the evaporator, respectively. If so, execute (9); otherwise, execute (10).

[0105] (9) Adjust solenoid valve 1 and solenoid valve 2 so that both solenoid valve 1 and solenoid valve 2 are in the open state.

[0106] (10) Determine whether the target cooling capacity q is greater than the maximum cooling capacity Q*0.5 (0.5 indicates that the cooling capacities of the first flow path and the second flow path are the same). If so, execute (11); otherwise, execute (12).

[0107] (11) Adjust solenoid valve 1 and solenoid valve 2 so that both solenoid valve 1 and solenoid valve 2 are in the open state.

[0108] (12) Close solenoid valve 1 and open solenoid valve 2. Replace the open and closed solenoid valves every 2 hours of operation.

[0109] The present application proposes a control method that can automatically select the evaporator flow path, perform intelligent state judgment according to the actual refrigeration needs of the unit operation, and select a more reasonable evaporator flow path under complex operating conditions through a method of coupling multiple parameter intervals. While ensuring the heat exchange demand, the unit's operating reliability is improved and energy saving is achieved at the same time.

[0110] When the indoor and outdoor temperature difference is large or the cooling demand is high, all the evaporator flow paths participate in the system refrigerant circulation; when the cooling demand is small, the evaporator flow paths participating in the system refrigerant circulation are automatically adjusted according to the indoor and outdoor temperature difference and the supercooling range. It solves the problem that when the target capacity is low, the air conditioner is still frequently started and stopped near the set temperature point when running at the lowest frequency, expands the cooling capacity range of the air conditioner, and improves comfort. It solves the power consumption and impact on components caused by the frequent start and stop of the air conditioner due to reaching the temperature point, and realizes the improvement of unit reliability and reduction of energy consumption. Some flow paths in the evaporator do not participate in the system circulation, which can store part of the refrigerant, reduce the total amount of refrigerant in the system, and reduce the system circulation resistance, which can reduce the energy consumption of the unit and achieve energy saving. By taking turns to participate in the system circulation by multiple flow paths, insufficient lubrication of the compressor is avoided and the reliability of the unit is guaranteed.

[0111] Based on the same inventive concept, Figure 5 As shown, the present application further provides a distributed air conditioning control device 50, the distributed air conditioning comprising an evaporator, wherein N flow paths are arranged in the evaporator, and any two flow paths are arranged in parallel with each other, wherein N is a positive integer, and N≥2; the distributed air conditioning control device 50 comprises:

[0112] Parameter acquisition module 51, used to obtain user set value and outdoor temperature;

[0113] A difference calculation module 52, used for calculating a first temperature difference between the outdoor temperature and the user set value;

[0114] A quantity determination module 53, configured to determine the opening quantity of the flow paths based on the first temperature difference;

[0115] The flow path control module 54 is used to control the opening of the flow path according to the opening quantity of the flow path.

[0116] The determining the opening quantity of the flow path based on the first temperature difference comprises:

[0117] When the first temperature difference is greater than or equal to a first preset temperature difference and less than or equal to a second preset temperature difference, calculating the subcooling degree of the evaporator;

[0118] The opening number of the flow paths is determined based on the degree of subcooling.

[0119] When the first temperature difference is less than a first preset temperature difference, it is determined that the number of open channels is one.

[0120] When the first temperature difference is greater than the second preset temperature difference, it is determined that the number of open flow paths is N.

[0121] Wherein, determining the opening quantity of the first flow path and the second flow path based on the supercooling degree includes:

[0122] Determining the opening quantity of the flow path based on the subcooling degree includes:

[0123] If the degree of supercooling is greater than or equal to a first preset degree of supercooling, the number of openings of the flow paths is determined according to the user-set temperature and the indoor temperature.

[0124] If the degree of subcooling is less than a first preset degree of subcooling, the number of open flow paths is determined to be N.

[0125] Further, determining the opening quantity of the flow path according to the user set temperature and the indoor temperature includes:

[0126] Obtaining a unit temperature difference corresponding to the cooling capacity of the flow path;

[0127] Acquire a second temperature difference between the indoor temperature and the user set temperature;

[0128] Calculating a ratio of the second temperature difference to the unit temperature difference;

[0129] The opening number of the flow path is determined according to the ratio, and the opening number is the ratio, or the opening number is the smallest integer greater than the ratio.

[0130] The distributed air conditioning control device provided in the embodiment of the present application, when obtaining the first temperature difference between the user set value and the outdoor temperature, determines the number of flow paths to be opened according to the first temperature difference, and finally controls the flow paths based on the number of flow paths to be opened. Since multiple flow paths are arranged in one evaporator and are arranged in parallel with each other, whether the refrigerant passes through one flow path does not affect whether other refrigerants flow through other flow paths. In this way, when the target capacity is low, at least one of the flow paths can be closed, and part of the refrigerant can be stored in the closed flow path of the evaporator so that it does not participate in the system circulation, reducing the minimum capacity of the air conditioner, and ensuring the smooth operation of the unit without reducing the minimum operating frequency of the air conditioner, improving the reliability and comfort of the unit, and reducing energy consumption.

[0131] Based on the same inventive concept, Figure 6As shown, the present application also provides a distributed air conditioning control system 60, including:

[0132] at least one processor 61 and at least one memory 62;

[0133] The memory stores executable instructions of the processor;

[0134] The processor is configured to execute the distributed air conditioning control method provided in the above embodiment.

[0135] The distributed air-conditioning control system provided by the embodiment of the present application stores executable instructions of the processor in a memory. When the executable instructions are executed, the processor can determine the number of flow paths to be opened according to the first temperature difference when obtaining the first temperature difference between the user set value and the outdoor temperature, and finally control the flow paths based on the number of flow paths to be opened. Since multiple flow paths are arranged in one evaporator and are arranged in parallel with each other, whether the refrigerant passes through one flow path does not affect whether other refrigerants flow through other flow paths. In this way, when the target capacity is low, at least one of the flow paths can be closed, and part of the refrigerant can be stored in the closed flow path of the evaporator so that it does not participate in the system circulation, thereby reducing the minimum capacity of the air conditioner. Without reducing the minimum operating frequency of the air conditioner, the unit can be ensured to operate smoothly, improve the unit reliability and comfort, and reduce energy consumption.

[0136] Based on the same inventive concept, the present application also provides an air conditioner, which applies the distributed air conditioning control method provided in the above embodiment.

[0137] The air conditioner provided in the embodiment of the present application, by applying the distributed air conditioning control method provided in the above embodiment, when obtaining the first temperature difference between the user set value and the outdoor temperature, determines the number of flow paths to be opened according to the first temperature difference, and finally controls the flow paths based on the number of flow paths to be opened. Since multiple flow paths are arranged in one evaporator and are arranged in parallel with each other, whether the refrigerant passes through one flow path does not affect whether other refrigerants flow through other flow paths. In this way, when the target capacity is low, at least one of the flow paths can be closed, and part of the refrigerant can be stored in the closed flow path of the evaporator so that it does not participate in the system circulation, reducing the minimum capacity of the air conditioner, and ensuring the smooth operation of the unit without reducing the minimum operating frequency of the air conditioner, improving the reliability and comfort of the unit, and reducing energy consumption.

[0138] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0139] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

Claims

1. A distributed air conditioning control method, characterized in that: The distributed air conditioner includes an evaporator, wherein N flow paths are arranged in the evaporator, and any two flow paths are arranged in parallel with each other, wherein N is a positive integer and N≥2; the method includes: Get user set value and outdoor temperature; Calculating a first temperature difference between the outdoor temperature and the user-set value; determining the opening quantity of the flow path based on the first temperature difference; The opening of the flow path is controlled according to the opening quantity of the flow path.

2. The method according to claim 1, characterized in that: The determining the opening quantity of the flow path based on the first temperature difference comprises: When the first temperature difference is greater than or equal to a first preset temperature difference and less than or equal to a second preset temperature difference, calculating the subcooling degree of the evaporator; The opening number of the flow paths is determined based on the degree of subcooling.

3. The method according to claim 2, characterized in that: The determining the opening number of the flow paths based on the subcooling degree comprises: If the degree of supercooling is greater than or equal to a first preset degree of supercooling, the number of openings of the flow paths is determined according to the user-set temperature and the indoor temperature.

4. The method according to claim 3, characterized in that: The step of determining the opening quantity of the flow path according to the user set temperature and the indoor temperature comprises: Obtaining a unit temperature difference corresponding to the cooling capacity of the flow path; Acquire a second temperature difference between the indoor temperature and the user set temperature; Calculating a ratio of the second temperature difference to the unit temperature difference; The opening number of the flow path is determined according to the ratio, and the opening number is the ratio, or the opening number is the smallest integer greater than the ratio.

5. The method according to claim 2, characterized in that: The determining the opening number of the flow paths based on the subcooling degree comprises: If the degree of subcooling is less than a first preset degree of subcooling, the number of open flow paths is determined to be N.

6. The method according to claim 1, characterized in that: The determining the opening quantity of the flow path based on the first temperature difference comprises: When the first temperature difference is less than a first preset temperature difference, it is determined that the number of open channels is one.

7. The method according to claim 1, characterized in that: The determining the opening quantity of the flow path based on the first temperature difference comprises: When the first temperature difference is greater than the second preset temperature difference, it is determined that the number of open flow paths is N.

8. A distributed air conditioning control device, characterized in that: The distributed air conditioner includes an evaporator, wherein N flow paths are arranged in the evaporator, and any two flow paths are arranged in parallel with each other, wherein N is a positive integer and N≥2; the device includes: Parameter acquisition module, used to obtain user set values ​​and outdoor temperature; A difference calculation module, used for calculating a first temperature difference between the outdoor temperature and the user set value; a quantity determination module, configured to determine the opening quantity of the flow paths based on the first temperature difference; A flow path control module is used to control the opening of the flow path according to the opening quantity of the flow path.

9. A distributed air conditioning control system, characterized in that: include: at least one processor and at least one memory; The memory stores executable instructions of the processor; The processor is configured to execute the method according to any one of claims 1 to 7.

10. An air conditioner, characterized in that: The method according to any one of claims 1 to 7 is used.

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