Multi-connected air conditioning system control method, device, equipment and storage medium

Abstract

The application discloses a multi-connected air conditioner system control method, device, equipment and storage medium, and belongs to the technical field of air conditioners. The application can determine the current energy demand of the multi-connected air conditioner system according to the operation state of each indoor unit, determine the energy demand stage in which the current energy demand is located, and adjust the frequency of the compressor, the switch state of the electromagnetic valve and the opening degree of the expansion valve according to the energy demand stage. The compressor, the electromagnetic valve connected with the economizer and the expansion valve can be adjusted according to the energy demand of the multi-connected air conditioner system, the phenomenon of poor refrigeration and heating when the energy demand is over-provisioned is avoided, a small-displacement non-injection enthalpy compressor is used, air supplement and enthalpy increase can be realized on the low-pressure side of the multi-connected air conditioner system through the auxiliary road of the economizer, the energy efficiency of the unit is improved, and power loss is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to a multi-split air conditioning system control method, device, equipment and storage medium. BACKGROUND

[0002] The existing multi-split air conditioning system capacity matching method: one-to-many indoor units, over-capacity, using spray enthalpy compressors to meet capacity requirements, using large-capacity compressors to meet capacity requirements, and using over-heat exchangers to meet capacity requirements. However, the main disadvantage of the existing multi-split air conditioning system capacity matching method is that when over-capacity, it is easy to appear poor refrigeration and heating, which seriously affects the user's body feeling, and when the capacity is small, the compressor "big cow pulls small car", causing high power consumption.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The main purpose of the present application is to provide a multi-split air conditioning system control method, device, equipment and storage medium, which aims to solve the technical problems of the prior art in over-capacity, easy to appear poor refrigeration and heating, which seriously affects the user's body feeling, and when the capacity is small, the compressor "big cow pulls small car", causing high power consumption.

[0005] To achieve the above purpose, the present application provides a multi-split air conditioning system control method, the multi-split air conditioning system includes a plurality of indoor units and a compressor, the compressor is connected with an economizer, the economizer is connected with a solenoid valve and an expansion valve respectively, the compressor is a small-capacity non-spray enthalpy compressor, used for supplementing air and increasing enthalpy of the low-pressure side of the multi-split air conditioning system through the economizer auxiliary road, the multi-split air conditioning system control method includes the following steps:

[0006] Determine the current capacity of the multi-split air conditioning system according to the operating state of each indoor unit;

[0007] Determine the capacity stage of the current capacity; and

[0008] Adjust the frequency of the compressor, the on-off state of the solenoid valve and the opening degree of the expansion valve according to the capacity stage.

[0009] Optionally, the adjustment of the frequency of the compressor, the on-off state of the solenoid valve and the opening degree of the expansion valve according to the capacity stage comprises:

[0010] When the capacity stage is a high-capacity stage, the frequency of the compressor is increased at a first frequency adjustment rate; and

[0011] opening the electromagnetic valve and the expansion valve, increasing the opening degree of the expansion valve according to a target expansion valve adjustment rate, and maintaining the expansion valve at a current opening degree when the current opening degree reaches a set opening degree threshold.

[0012] Optionally, after the maintaining the expansion valve at the current opening degree, the method further comprises:

[0013] detecting running states of each indoor unit when the expansion valve is maintained at the current opening degree within a preset period; and

[0014] obtaining a number of indoor units whose running states are a temperature reaching state, and reducing the first frequency adjustment rate when the number exceeds a preset number.

[0015] Optionally, the adjusting the frequency of the compressor, the switching state of the electromagnetic valve and the opening degree of the expansion valve according to the energy demand stage comprises:

[0016] when the energy demand stage is a medium energy demand stage, increasing the frequency of the compressor according to a second frequency adjustment rate, the first frequency adjustment rate being greater than the second frequency adjustment rate;

[0017] detecting running states of each indoor unit when the compressor is operated at the increased frequency within a preset period, and obtaining a number of indoor units whose running states are a temperature reaching state;

[0018] reducing the second frequency adjustment rate when the number exceeds a preset number; and

[0019] when the number does not exceed a preset number, opening the electromagnetic valve and the expansion valve, increasing the opening degree of the expansion valve according to a target expansion valve adjustment rate, and maintaining the expansion valve at a current opening degree when the current opening degree reaches a set opening degree threshold.

[0020] Optionally, the adjusting the frequency of the compressor, the switching state of the electromagnetic valve and the opening degree of the expansion valve according to the energy demand stage comprises:

[0021] when the energy demand stage is a low energy demand stage, increasing the frequency of the compressor according to a third frequency adjustment rate, and not opening the electromagnetic valve and the expansion valve, the second frequency adjustment rate being greater than the third frequency adjustment rate;

[0022] detecting running states of each indoor unit when the compressor is operated at the increased frequency within a preset period, and obtaining a number of indoor units whose running states are a temperature reaching state; and

[0023] reducing the third frequency adjustment rate when the number exceeds a preset number.

[0024] Optionally, the adjusting the frequency of the compressor, the switching state of the electromagnetic valve and the opening degree of the expansion valve according to the energy demand stage comprises:

[0025] when the energy demand stage is a small energy demand stage, increasing the frequency of the compressor at a fourth frequency adjusting rate, the third frequency adjusting rate being greater than the fourth frequency adjusting rate;

[0026] detecting a current indoor temperature and a set temperature when the compressor is running at the increased frequency in a preset period;

[0027] when a temperature difference between the current indoor temperature and the set temperature is within a preset difference range, not opening the electromagnetic valve and the expansion valve; and

[0028] when a temperature difference between the current indoor temperature and the set temperature is within a preset difference range, opening the electromagnetic valve and the expansion valve, increasing the opening degree of the expansion valve at a target expansion valve adjusting rate, the target expansion valve adjusting rate being determined by the temperature difference.

[0029] Optionally, the multi-split air conditioning system control method further comprises:

[0030] obtaining an auxiliary road inlet temperature and an auxiliary road outlet temperature of the economizer;

[0031] determining a superheat degree of the economizer according to the auxiliary road inlet temperature and the auxiliary road outlet temperature; and

[0032] determining a target expansion valve adjusting rate based on a superheat degree range in which the superheat degree is located.

[0033] Optionally, the multi-split air conditioning system control method further comprises:

[0034] obtaining a current exhaust temperature of the compressor;

[0035] when the current exhaust temperature does not exceed a first preset exhaust temperature, performing the step of determining the energy demand stage in which the current energy demand is located;

[0036] when the current exhaust temperature exceeds the first preset exhaust temperature, opening the electromagnetic valve and the expansion valve, and increasing the opening degree of the expansion valve at a target expansion valve adjusting rate, the target expansion valve adjusting rate being determined by a temperature difference between the current exhaust temperature and a preset exhaust temperature; and

[0037] when the current exhaust temperature decreases to below a second preset exhaust temperature and lasts for a time longer than a preset time, closing the electromagnetic valve and the expansion valve.

[0038] In addition, to achieve the above object, the application further provides a multi-connected air conditioning system control device, the multi-connected air conditioning system comprising a plurality of indoor units and a compressor, the compressor being connected with an economizer, the economizer being connected with a solenoid valve and an expansion valve respectively, the compressor being a small-displacement non-injection compressor, and the economizer auxiliary path being used to supplement air and increase enthalpy for the low-pressure side of the multi-connected air conditioning system.

[0039] The multi-connected air conditioning system control device comprises:

[0040] a detection module configured to determine a current energy demand of the multi-connected air conditioning system according to the operating states of the indoor units;

[0041] a judgment module configured to determine an energy demand stage of the current energy demand; and

[0042] an adjustment module configured to adjust the frequency of the compressor, the on-off state of the solenoid valve and the opening degree of the expansion valve according to the energy demand stage.

[0043] In addition, to achieve the above object, the application further provides a multi-connected air conditioning system control device, the multi-connected air conditioning system control device comprising a memory, a processor and a multi-connected air conditioning system control program stored in the memory and running on the processor, the multi-connected air conditioning system control program being configured to implement the multi-connected air conditioning system control method as described above.

[0044] In addition, to achieve the above object, the application further provides a storage medium, the storage medium storing a multi-connected air conditioning system control program, the multi-connected air conditioning system control program being executed by a processor to implement the multi-connected air conditioning system control method as described above.

[0045] The application can adjust the compressor and the solenoid valve and the expansion valve connected with the economizer according to the energy demand of the multi-connected air conditioning system, avoid the poor refrigeration and heating when the energy demand is over-provisioned, and use the small-displacement non-injection compressor to supplement air and increase enthalpy for the low-pressure side of the multi-connected air conditioning system through the economizer auxiliary path, improve the energy efficiency of the unit and avoid the power loss. BRIEF DESCRIPTION OF DRAWINGS

[0046] Economizer is a structural schematic diagram of a multi-connected air conditioning system control device of a hardware running environment related to the embodiment scheme of the application;

[0047] Four-way valveFlow chart of the first embodiment of the multi-connected air conditioning system control method of the present application;

[0048] Expansion valve Schematic diagram of the multi-connected air conditioning system structure in the first embodiment of the air conditioner control method of the present application;

[0049] Outdoor sensor Schematic diagram of the energy demand stage division in the first embodiment of the air conditioner control method of the present application;

[0050] Solenoid valve Flow chart of the second embodiment of the multi-connected air conditioning system control method of the present application;

[0051] Direct current fan Flow chart of the third embodiment of the multi-connected air conditioning system control method of the present application;

[0052] First sensor Structural block diagram of the first embodiment of the multi-connected air conditioning system control device of the present application.

[0053] Explanation of reference numerals

[0054] 1 Main electronic expansion valve 11 Second sensor 2 Filter 12 Compressor 3 Refrigerant heat radiation ring 13 Gas-liquid separator 4 Temperature sensing bulb 14 Oil return capillary 5 Vapor side pipe 15 Oil return hole 6 Liquid side pipe 16 Oil separator 7 Figure 1 17 Figure 1 8 Figure 1 18 Figure 1 9 Figure 1 19 Figure 1 10 Figure 2

[0055] The realization of the object, functional features and advantages of the present application will be further explained in connection with the embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0056] It should be understood that the specific embodiments described herein are merely illustrative of the present application and do not limit the present application.

[0057] Reference Figure 2 , Figure 3 Schematic diagram of the multi-connected air conditioning system control device structure of the hardware running environment involved in the embodiment scheme of the present application.

[0058] As Figure 3As shown, the multi-split air conditioning system control device can include a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to realize the connection and communication between the components. The user interface 1003 can include a display, an input unit such as a keyboard, and can also include a standard wired interface, a wireless interface. The network interface 1004 can optionally include a standard wired interface, a wireless interface (such as a wireless fidelity (Wi-Fi) interface). The memory 1005 can be a high-speed random access memory (RAM) memory, or a stable non-volatile memory (NVM) such as a disk memory. The memory 1005 can also be a storage device independent of the aforementioned processor 1001.

[0059] Those skilled in the art can understand that Figure 4 The structure shown in the figure does not constitute a limitation on the multi-split air conditioning system control device, and can include more or fewer components than the figure, or combine certain components, or different component arrangements.

[0060] As Figure 4 As shown, the memory 1005 as a storage medium can include an operating system, a network communication module, a user interface module, and a multi-split air conditioning system control program.

[0061] In Figure 5 In the multi-split air conditioning system control device shown, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the multi-split air conditioning system control device can be arranged in the multi-split air conditioning system control device, and the multi-split air conditioning system control device calls the multi-split air conditioning system control program stored in the memory 1005 through the processor 1001, and executes the multi-split air conditioning system control method provided by the embodiment of the application.

[0062] The embodiment of the application provides a multi-split air conditioning system control method, which refers to Figure 5 , Figure 6 The flowchart of a first embodiment of the multi-split air conditioning system control method of the application is shown.

[0063] In this embodiment, the multi-split air conditioning system control method includes the following steps:

[0064] Step S10: Determine the current energy demand of the multi-split air conditioning system according to the operating state of each indoor unit.

[0065] In this embodiment, the execution subject of the embodiment can be the multi-split air conditioning system control device, which has functions of data processing, data communication, program running, etc. The multi-split air conditioning system control device can be a controller inside an air conditioner. Of course, it can also be other devices with similar functions, which are not limited in the embodiment. For ease of illustration, the embodiment is described taking the multi-split air conditioning system control device as an example.

[0066] It should be noted that the existing multi-split air conditioning system capacity matching method: one-to-many indoor units, energy demand overcapacity, using a jet enthalpy compressor to meet the capacity demand, using a large displacement compressor to meet the capacity demand, using an excess heat exchanger to meet the capacity demand. The shortcomings of the existing multi-split air conditioning system capacity matching method: when the energy demand is overcapacity, it is easy to appear poor refrigeration and heating, which seriously affects the user's feeling. Non-jet enthalpy cannot completely meet the capacity demand in severe environments such as ultra-low temperature and ultra-high temperature. When the energy demand is small, the compressor "big horse pulls small car" appears, causing high power consumption. And when the large displacement compressor runs at low frequency, abnormal noise and vibration are easy to appear, affecting the service life of the compressor. The heat exchanger volume / volume is too large, which is limited by the body space / user installation space, and the cost is high. When the compressor runs at high frequency, the corresponding exhaust temperature and winding temperature are high, affecting the service life of the compressor.

[0067] In this embodiment, in view of the above technical problems, a structure of a multi-split air conditioning system is first proposed, and the specific structure is shown in Figure 6 Figure 7 ​The multi-split air conditioning system in the embodiment comprises an economizer 1, an expansion valve 2, a solenoid valve 3, a first sensor 4, a second sensor 5, a compressor 6, a gas-liquid separator 7, an oil return capillary 8, an oil return hole 9, an oil separator 10, a four-way valve 11, an outdoor sensor 12, a direct-current fan 13, a main electronic expansion valve 14, a filter 15, a refrigerant heat dissipation ring 16, a temperature-sensitive bag 17, a vapor-side pipe 18, and a liquid-side pipe 19. The multi-split air conditioning system adopts a small-displacement non-ejecting compressor, and can supplement air and increase enthalpy of the low-pressure side of the multi-split air conditioning system through the economizer auxiliary path. The small-displacement compressor meets the low-frequency output of the multi-split single / double small indoor unit in a low energy demand, is energy-saving and efficient, and meets the high-frequency output in a high energy demand under overloading, severe environment, and the like through the low-pressure side air supplement and enthalpy increase. It should be noted that the small-displacement compressor can also solve the problem of abnormal noise and vibration during low-frequency operation. The economizer auxiliary path is used to supplement air and increase enthalpy of the low-pressure side of the system, and the non-ejecting compressor realizes two-stage compression, which is not only energy-saving and efficient, but also can effectively reduce the exhaust temperature, so that the motor efficiency and winding temperature of the compressor are kept within a normal range, and the service life is prolonged.

[0068] In specific implementation, in the embodiment, it is necessary to distinguish according to the matching number of indoor and outdoor units of the multi-split system, that is, to determine the current energy demand of the multi-split air conditioning system according to the operating state of each indoor unit. The more the number of indoor units is turned on, the larger the matching number is, and the higher the energy demand of the multi-split air conditioning system is. The specific energy demand determination method can also adopt other ways, which are not limited in the embodiment.

[0069] Step S20: determining the energy demand stage in which the current energy demand is located.

[0070] In specific implementation, after determining the current energy demand of the multi-split air conditioning system, the embodiment further determines the energy demand stage corresponding to the current energy demand. Specifically, the embodiment can compare the current energy demand with a plurality of energy demand stages set in advance, so as to determine the energy demand stage corresponding to the current energy demand. The energy demand stages set in advance in the embodiment can refer to FIG. 1. Figure 7 As shown in FIG. 1, the energy demand stage can be divided into a high energy demand stage of 90% to 130%, a medium energy demand stage of 50% to 90%, a low energy demand stage of 20% to 50%, and a small energy demand stage (min energy demand stage) of 20% or less. The specific energy demand stage can also be adjusted according to the actual situation, which is not limited in the embodiment.

[0071] Step S30: adjusting the frequency of the compressor, the switch state of the solenoid valve, and the opening degree of the expansion valve according to the energy demand stage.

[0072] In a specific implementation, the adjustment strategies adopted in this embodiment are different for different energy demand stages, and adjustment is performed according to the adjustment strategy corresponding to each different energy demand stage. The adjustment includes the frequency of the compressor, the on-off state of the electromagnetic valve, and the opening degree of the expansion valve. It is also emphasized that the electromagnetic valve and the expansion valve are linked to be opened or closed in this embodiment, and after the electromagnetic valve and the expansion valve are simultaneously opened, the opening degree of the expansion valve needs to be further adjusted. The adjustment manner can be further referred to Figure 7 For example, for the adjustment of the compressor frequency, when the energy demand stage is a high energy demand stage, the adjustment rate of the compressor frequency is 4 Hz / 5 s, when the energy demand stage is a medium energy demand stage, the adjustment rate of the compressor frequency is 3 Hz / 5 s, when the energy demand stage is a low energy demand stage, the adjustment rate of the compressor frequency is 2 Hz / 5 s, and when the energy demand stage is a small energy demand stage, the adjustment rate of the compressor frequency is 1 Hz / 5 s. For the adjustment of the electromagnetic valve and the expansion valve, for example, when the energy demand stage is a high energy demand stage, the multi-split air conditioning system opens the air supplement and enthalpy increase, the economizer auxiliary road is opened, and the electromagnetic valve and the expansion valve of the economizer auxiliary road are linked to be opened or closed. At this time, the expansion valve and the electromagnetic valve of the economizer auxiliary road are simultaneously opened. For example, when the energy demand stage is a low energy demand stage, the multi-split air conditioning system does not open the air supplement and enthalpy increase, and the economizer auxiliary road is closed. At this time, the electromagnetic valve and the expansion valve are not opened. The above adjustment manner is only for illustration, and in actual situations, corresponding adjustment can be performed according to actual adjustment. This embodiment does not limit this.

[0073] In this embodiment, the current energy demand of the multi-split air conditioning system is determined according to the operating state of each indoor unit, the energy demand stage in which the current energy demand is located is determined, and the frequency of the compressor, the on-off state of the electromagnetic valve, and the opening degree of the expansion valve are adjusted according to the energy demand stage. The compressor and the electromagnetic valve and the expansion valve connected with the economizer can be adjusted according to the energy demand of the multi-split air conditioning system, avoiding the phenomenon of poor refrigeration and heating when the energy demand is over-provisioned. At the same time, a small displacement non-injection enthalpy compressor is adopted, the air supplement and enthalpy increase of the low-pressure side of the multi-split air conditioning system are performed through the economizer auxiliary road, the energy efficiency of the unit is improved, and the power loss is avoided.

[0074] Reference Figure 3 , Figure 3 This is a flowchart of a second embodiment of a multi-split air conditioning system control method of the application.

[0075] Based on the above first embodiment, in the multi-split air conditioning system control method of this embodiment, the step S30 specifically includes:

[0076] Step S301: When the energy demand stage is a high energy demand stage, the frequency of the compressor is increased at a first frequency adjustment rate.

[0077] In a specific implementation, when it is judged that the current energy demand stage belongs to the high energy demand stage, the frequency of the compressor is raised according to the first frequency modulation rate in this embodiment, that is, the compressor rises to the high frequency field according to the starting platform, wherein the first frequency modulation rate can be set to 4 Hz / 3 s, and other values can also be set according to actual control requirements, and this embodiment does not limit this.

[0078] Step S302: open the electromagnetic valve and the expansion valve, increase the opening degree of the expansion valve according to the target expansion valve adjustment rate, and maintain the expansion valve at the current opening degree when the current opening degree of the expansion valve reaches the set opening degree threshold.

[0079] It should be noted that after the frequency of the compressor rises to the upper limit value of the frequency of the high energy demand stage, the system opens the gas supplement and enthalpy increase, the economizer auxiliary road is opened, and the electromagnetic valve and the expansion valve are further opened in this embodiment. After the expansion valve is opened with the minimum number X, the feedback of the first sensor and the second sensor is detected, the adjustment number of the expansion valve is adjusted, and the superheat degree of the economizer is continuously adjusted.

[0080] In this embodiment, the superheat degree of the economizer can be calculated every 20 s, wherein the superheat degree of the economizer can be determined according to the auxiliary road inlet temperature and the auxiliary road outlet temperature. The first sensor is an auxiliary road inlet sensor, and the auxiliary road inlet temperature can be obtained. The second sensor is an auxiliary road outlet sensor, and the auxiliary road outlet temperature can be obtained. Then, the target expansion valve adjustment rate is determined according to the superheat degree of the economizer to adjust the opening degree of the expansion valve. Further, when the superheat degree of the economizer is greater than 5℃, the target expansion valve adjustment rate is 2; when the superheat degree of the economizer is less than 5℃ and greater than 2℃, the target expansion valve adjustment rate is 1; when the superheat degree of the economizer is less than 2℃ and greater than 0℃, the target expansion valve adjustment rate is 0.5. The specific adjustment rate can also be adjusted according to actual requirements, and this embodiment does not limit this.

[0081] It should be noted that by adjusting the opening degree of the expansion valve, the superheat degree of the economizer can be affected, and when the superheat degree of the economizer reaches a set value or is within a set range, the adjustment of the opening degree of the expansion valve is stopped, and at this time the multi-split air conditioning system operates according to the current opening degree of the expansion valve after adjustment. When the expansion valve is maintained at the current opening degree, the running state of each indoor unit in a preset period is further detected in this embodiment, for example, it can be detected once every 15 minutes. Through detection, it can be determined that the number of indoor units in the temperature reaching state, and if it does not exceed the preset number, the detection is continued according to the above period, and if it exceeds the preset number, the first frequency modulation rate is reduced. In this embodiment, the indoor temperature corresponding to the indoor unit and the set temperature can be used to determine whether the indoor unit is in the temperature reaching state, for example, T(indoor temperature)-Ts(set temperature) is greater than 0℃ and less than 0.5℃, it is determined that the indoor is in the temperature reaching state at this time. The preset number can be set to 3, and the first frequency modulation rate can be reduced from 4Hz / 3s to 4Hz / 5s. Of course, the above parameters are adjusted according to actual needs, and this embodiment does not limit this.

[0082] Further, when it is judged that the current energy demand belongs to the medium energy demand stage, the frequency of the compressor is increased according to the second frequency modulation rate in this embodiment, that is, the compressor rises to the medium frequency field on the starting platform, wherein the second frequency modulation rate can be set to 3Hz / 3s, and other values can also be set according to actual control needs, and this embodiment does not limit this.

[0083] After the frequency of the compressor reaches the upper limit of the medium frequency field, the running state of each indoor unit is also detected in this embodiment, and it is judged whether the number of indoor units in the temperature reaching state exceeds the preset number. Similarly, when the number of indoor units in the temperature reaching state exceeds the preset number, the second frequency modulation rate is reduced, and the second frequency modulation rate can be reduced from 3Hz / 5s to 3Hz / 5s. Further, if the preset number is not exceeded, and the duration recorded in the timer exceeds the preset duration, the electromagnetic valve and the expansion valve are opened, and the opening degree of the expansion valve is also increased according to the target expansion valve adjustment rate, and the adjustment mode is similar to that in the high energy demand stage, which will not be repeated here.

[0084] Further, when the energy demand stage is a low energy demand stage, the frequency of the compressor is increased at a third frequency modulation rate in the embodiment, and the increase is stopped when the frequency reaches the upper limit of the low frequency range. The third frequency modulation rate can be set to 2 Hz / 3 s, and other values can also be set according to actual control requirements, which are not limited in the embodiment. At this time, the system does not start the gas supplement and enthalpy increase of the economizer auxiliary path, that is, the electromagnetic valve and the expansion valve are not started. Then, the indoor unit in the temperature reaching state is detected in the same way as described above, and when the number exceeds the preset number, the third frequency modulation rate is reduced, which can be reduced from 2 Hz / 5 s to 2 Hz / 5 s.

[0085] When the energy demand stage is a low energy demand stage, the frequency of the compressor is increased at a third frequency modulation rate in the embodiment, and the increase is stopped when the frequency reaches the upper limit of the low frequency range. The third frequency modulation rate can be set to 2 Hz / 3 s, and other values can also be set according to actual control requirements, which are not limited in the embodiment. At this time, the system does not start the gas supplement and enthalpy increase of the economizer auxiliary path, that is, the electromagnetic valve and the expansion valve are not started. Then, the indoor unit in the temperature reaching state is detected in the same way as described above, and when the number exceeds the preset number, the third frequency modulation rate is reduced, which can be reduced from 2 Hz / 5 s to 2 Hz / 5 s. When the energy demand stage is a low energy demand stage, the frequency of the compressor is increased at a third frequency modulation rate in the embodiment, and the increase is stopped when the frequency reaches the upper limit of the low frequency range. The third frequency modulation rate can be set to 2 Hz / 3 s, and other values can also be set according to actual control requirements, which are not limited in the embodiment. At this time, the system does not start the gas supplement and enthalpy increase of the economizer auxiliary path, that is, the electromagnetic valve and the expansion valve are not started. Then, the indoor unit in the temperature reaching state is detected in the same way as described above, and when the number exceeds the preset number, the third frequency modulation rate is reduced, which can be reduced from 2 Hz / 5 s to 2 Hz / 5 s.

[0086] The embodiment adjusts the frequency of the compressor, the switch state of the electromagnetic valve and the opening degree of the expansion valve according to different energy demand stages of the multi-connected air conditioning system, adjusts the adjustment frequency of the opening degree of the expansion valve according to the superheat of the economizer for different energy demand stages, and further adjusts the frequency of the compressor according to the indoor temperature, thereby avoiding the poor refrigeration and heating when the energy demand is over-provisioned, and enabling the economizer to selectively open the air supplement and enthalpy increase when the energy demand is low, improving the energy efficiency of the unit and avoiding power loss.

[0087] Reference Figure 4 , Figure 4 The flowchart of the third embodiment of the multi-connected air conditioning system control method is shown.

[0088] Based on the first embodiment, the third embodiment of the multi-connected air conditioning system control method is provided.

[0089] In the embodiment, the step S20 further includes:

[0090] Step S201: Obtain the current discharge temperature of the compressor.

[0091] Step S202: Open the electromagnetic valve and the expansion valve, and increase the opening degree of the expansion valve at a target expansion valve adjustment rate, wherein the target expansion valve adjustment rate is determined by the temperature difference between the current discharge temperature and a preset discharge temperature.

[0092] It should be noted that in the case of energy demand, the discharge temperature during the operation of the unit also needs to be detected in the embodiment. After obtaining the discharge temperature, the current discharge temperature is compared with the first preset discharge temperature. If the current discharge temperature is less than or equal to the first preset discharge temperature, subsequent adjustment can be performed based on the different energy demands of the energy demand stage. However, if it is detected that the current discharge temperature exceeds the first preset discharge temperature and the continuous operation time exceeds t1, the economizer opens the air supplement and enthalpy increase, the electromagnetic valve is opened, the expansion valve is opened, the expansion valve A is opened with the minimum step X, and then the sensor monitors the discharge temperature Td. When Td-97>5℃, the expansion valve is adjusted at a rate of 2, which can avoid the shutdown of the unit due to high discharge. When Td-97>3℃, the expansion valve is adjusted at a rate of 1, but when Td-97>1℃, the expansion valve is adjusted at a rate of 0.5. The first preset discharge temperature can be set to 97℃, Td represents the current discharge temperature, and Td-97 represents the temperature difference between the current discharge temperature and the preset discharge temperature.

[0093] Step S203: When the current discharge temperature decreases to below the second preset discharge temperature and lasts for more than a preset time, the electromagnetic valve and the expansion valve are closed.

[0094] The exhaust temperature can be reduced by the above method. When the sensor detects that Td<90℃ (i.e. the current exhaust temperature is reduced to below the second preset exhaust temperature) and the duration exceeds t2, the economizer auxiliary path is closed / the electromagnetic valve is closed, and the system adjusts the exhaust temperature according to the conventional control. The first preset exhaust temperature, the second preset exhaust temperature, and the corresponding relationship between the temperature difference between the current exhaust temperature and the preset exhaust temperature and the adjustment rate of the expansion valve can be adjusted according to actual conditions, and the present embodiment is not limited in this regard.

[0095] The present embodiment detects the exhaust temperature, adjusts the expansion valve according to the difference between the exhaust temperature and the preset exhaust temperature when the exhaust temperature is high, reduces the exhaust temperature, and then closes the electromagnetic valve and the expansion valve after the exhaust temperature is reduced. The above method can effectively reduce the exhaust temperature, keep the motor efficiency and winding temperature of the compressor within a normal range, and prolong the service life.

[0096] In addition, the present embodiment also provides a storage medium, and the storage medium stores a multi-split air conditioning system control program. The multi-split air conditioning system control program is executed by a processor to implement the steps of the multi-split air conditioning system control method described above.

[0097] Since the storage medium adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0098] Referring to ​ , ​ is a structural block diagram of a first embodiment of the multi-split air conditioning system control device of the present application.

[0099] As ​ shown, the multi-split air conditioning system control device provided by the present embodiment comprises:

[0100] The detection module 10 is configured to determine the current energy demand of the multi-split air conditioning system according to the operating state of each indoor unit.

[0101] It should be noted that the existing multi-split air conditioning system capacity matching method: one multi-split indoor unit, over-capacity, using a jet enthalpy compressor to meet the capacity demand, using a large displacement compressor to meet the capacity demand, using an excess heat exchanger to meet the capacity demand, the shortcomings of the existing multi-split air conditioning system capacity matching method: over-capacity, easy to appear poor refrigeration and heating, seriously affect the user's feeling, non-jet enthalpy cannot completely meet the capacity demand in severe environment such as ultra-low temperature and ultra-high temperature, when the capacity demand is small, the compressor "big horse pulls small car", resulting in high power consumption; and large displacement compressor is prone to abnormal noise and vibration when running at low frequency, affecting the service life of the compressor, the heat exchanger volume / volume is too large, limited by the body space / user installation space, and the cost is high, the corresponding exhaust temperature and winding temperature are high when the compressor runs at high frequency, affecting the service life of the compressor.

[0102] In this embodiment, in order to solve the above technical problems, a multi-split air conditioning system structure is first proposed, as shown in the specific structure of ​ Referring to ​ , the multi-split air conditioning system in this embodiment is composed of an economizer 1, an expansion valve 2, a solenoid valve 3, a first sensor 4, a second sensor 5, a compressor 6, a gas-liquid separator 7, an oil return capillary 8, an oil return hole 9, an oil separator 10, a four-way valve 11, an outdoor sensor 12, a direct current fan 13, a main electronic expansion valve 14, a filter 15, a refrigerant heat dissipation ring 16, a temperature-sensitive bag 17, a steam side pipe 18, and a liquid side pipe 19. The multi-split air conditioning system uses a small displacement non-jet enthalpy compressor, and can supplement air and increase enthalpy on the low pressure side of the multi-split air conditioning system through the economizer auxiliary road. The small displacement compressor meets the low frequency output of the multi-split small indoor unit with low capacity demand, saves energy and is efficient, and at the same time, through the low pressure side air supplement and enthalpy increase, it meets the high frequency output of the high capacity demand in the over-capacity and severe environment. It should be noted that the small displacement compressor can also solve the problem of abnormal noise and vibration when running at low frequency. The economizer auxiliary road supplements air and increases enthalpy on the low pressure side of the system, realizes two-stage compression of the non-jet enthalpy compressor, not only saves energy and is efficient; at the same time, it can effectively reduce the exhaust temperature, so that the motor efficiency and winding temperature of the compressor remain within the normal range, prolonging the service life.

[0103] In specific implementation, in this embodiment, it is necessary to first distinguish according to the number of indoor and outdoor units of the multi-split system, that is, to determine the current capacity demand of the multi-split air conditioning system according to the running state of each indoor unit. The more the number of indoor units turned on, the larger the corresponding number of units, and the higher the capacity demand of the multi-split air conditioning system. The specific capacity demand judgment method can also adopt other ways, which are not limited in this embodiment.

[0104] The judgment module 20 is used to determine the capacity demand stage where the current capacity demand is located.

[0105] In a specific implementation, after determining the current energy demand of the multi-split air conditioning system, the embodiment further determines the energy demand stage corresponding to the current energy demand. Specifically, the embodiment can compare the current energy demand with a plurality of energy demand stages set in advance to determine the energy demand stage corresponding to the current energy demand. The energy demand stages set in advance in the embodiment can refer to FIG. 2. ​ As shown in FIG. 2, the energy demand stage can be divided into a high energy demand stage of 90% to 130%, a medium energy demand stage of 50% to 90%, a low energy demand stage of 20% to 50%, and a small energy demand stage (min energy demand stage) of 20% or less. The specific setting of the energy demand stage can also be adjusted according to the actual situation, which is not limited in the embodiment.

[0106] The adjustment module 30 is configured to adjust the frequency of the compressor, the switching state of the electromagnetic valve, and the opening degree of the expansion valve according to the energy demand stage.

[0107] In a specific implementation, the adjustment strategies adopted in the embodiment for different energy demand stages are different, and the adjustment is performed according to the adjustment strategy corresponding to each different energy demand stage. The adjustment includes the frequency of the compressor, the switching state of the electromagnetic valve, and the opening degree of the expansion valve. It should be further emphasized that the electromagnetic valve and the expansion valve are opened or closed in linkage in the embodiment, and the opening degree of the expansion valve needs to be further adjusted after the electromagnetic valve and the expansion valve are opened at the same time. The adjustment manner can further refer to FIG. 3. ​ For example, for the adjustment of the frequency of the compressor, when the energy demand stage is the high energy demand stage, the adjustment rate of the frequency of the compressor is 4 Hz / 5 s, when the energy demand stage is the medium energy demand stage, the adjustment rate of the frequency of the compressor is 3 Hz / 5 s, when the energy demand stage is the low energy demand stage, the adjustment rate of the frequency of the compressor is 2 Hz / 5 s, and when the energy demand stage is the small energy demand stage, the adjustment rate of the frequency of the compressor is 1 Hz / 5 s. For the adjustment of the electromagnetic valve and the expansion valve, for example, when the energy demand stage is the high energy demand stage, the multi-split air conditioning system opens the air supplement and enthalpy increase, and the economizer auxiliary road is opened. The electromagnetic valve and the expansion valve of the economizer auxiliary road are opened or closed in linkage. At this time, the expansion valve and the electromagnetic valve of the economizer auxiliary road are opened at the same time. For example, when the energy demand stage is the low energy demand stage, the multi-split air conditioning system does not open the air supplement and enthalpy increase, and the economizer auxiliary road is closed. At this time, the electromagnetic valve and the expansion valve are not opened. The above adjustment manner is only for illustration, and the adjustment can be adjusted according to the actual situation in the actual situation, which is not limited in the embodiment.

[0108] The embodiment determines the current energy demand of the multi-split air conditioning system according to the operating state of each indoor unit, determines the energy demand stage in which the current energy demand is located, and adjusts the frequency of the compressor, the switch state of the electromagnetic valve and the opening degree of the expansion valve according to the energy demand stage, so that the compressor and the electromagnetic valve and the expansion valve connected with the economizer can be adjusted according to the energy demand of the multi-split air conditioner system, the phenomenon of poor refrigeration and heating when the energy demand is over-provisioned is avoided, and the small displacement non-injection compressor is used, the low pressure side of the multi-split air conditioner system can be supplemented and the enthalpy of the economizer auxiliary road is increased, the energy efficiency of the unit is improved, and the power loss is avoided.

[0109] It should be understood that the above is only illustrative, and does not constitute any limitation on the technical solutions of the present application. In specific applications, those skilled in the art can set up according to the needs, and the present application does not limit this.

[0110] It should be noted that the above-described workflow is only illustrative and does not limit the scope of protection of the present application. In actual application, those skilled in the art can select part or all of them to achieve the purpose of the embodiment scheme according to the actual needs, which is not limited here.

[0111] In addition, technical details not described in detail in the embodiment can be referred to the multi-split air conditioner system control method provided by any embodiment of the present application, which will not be repeated here.

[0112] In addition, it should be noted that in this paper, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or system. Without more limitations, the element defined by the sentence "includes a" does not exclude the presence of other identical elements in the process, method, article or system including the element.

[0113] The above embodiment number of the present application is only for description, not representing the advantages and disadvantages of the embodiments.

[0114] Those skilled in the art can clearly understand the above-mentioned embodiment method can be realized by means of software and the necessary general hardware platform, of course, can also be through hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application essentially or say the part of the prior art contribution can be embodied in the form of software products, the computer software product is stored in a storage medium (such as read only memory (Read Only Memory, ROM) / RAM, disk, optical disk), including a number of instructions to make a terminal device (may be a mobile phone, computer, server, or network equipment, etc.) executes the method described in various embodiments of the present application.

[0115] The above is only the preferred embodiment of the present application, not therefore limit the patent scope of the present application, any equivalent structure or equivalent flow transformation made by using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A multi VRF air conditioning system control method, characterized by, The multi-connected air conditioning system comprises a plurality of indoor units and a compressor, the compressor is connected with an economizer, the economizer is connected with an electromagnetic valve and an expansion valve respectively, the compressor is a small-displacement non-injection compressor, and the compressor is used for supplementing air and increasing enthalpy of the low-pressure side of the multi-connected air conditioning system through the economizer auxiliary path. The multi-connected air conditioning system control method comprises: determining a current energy demand of the multi-connected air conditioning system according to operating states of the indoor units; determining an energy demand stage in which the current energy demand is located, wherein the energy demand stage comprises a high energy demand stage, a medium energy demand stage, a low energy demand stage and a small energy demand stage; and adjusting a frequency of the compressor, an on-off state of the electromagnetic valve and an opening degree of the expansion valve according to the energy demand stage; the adjusting of the frequency of the compressor, the on-off state of the electromagnetic valve and the opening degree of the expansion valve according to the energy demand stage comprises: when the energy demand stage is the high energy demand stage, increasing the frequency of the compressor at a first frequency adjustment rate; and turning on the electromagnetic valve and the expansion valve, increasing the opening degree of the expansion valve at a target expansion valve adjustment rate, and maintaining the expansion valve at a current opening degree when the current opening degree reaches a set opening degree threshold value; the adjusting of the frequency of the compressor, the on-off state of the electromagnetic valve and the opening degree of the expansion valve according to the energy demand stage comprises: when the energy demand stage is the medium energy demand stage, increasing the frequency of the compressor at a second frequency adjustment rate, the first frequency adjustment rate being greater than the second frequency adjustment rate; detecting operating states of the indoor units when the compressor operates at the increased frequency in a preset period, and obtaining a number of indoor units in a temperature-reached state among the operating states; when the number exceeds a preset number, decreasing the second frequency adjustment rate; and when the number does not exceed the preset number, turning on the electromagnetic valve and the expansion valve, increasing the opening degree of the expansion valve at a target expansion valve adjustment rate, and maintaining the expansion valve at a current opening degree when the current opening degree reaches a set opening degree threshold value. the maintaining of the expansion valve at the current opening degree when the energy demand stage is the high energy demand stage further comprises: detecting operating states of the indoor units when the expansion valve is maintained at the current opening degree in a preset period; and 2. The control method of a multi VRF air conditioning system according to claim 1, wherein, obtaining a number of indoor units in a temperature-reached state among the operating states, and decreasing the first frequency adjustment rate when the number exceeds a preset number. the adjusting of the frequency of the compressor, the on-off state of the electromagnetic valve and the opening degree of the expansion valve according to the energy demand stage comprises: when the energy demand stage is the low energy demand stage, increasing the frequency of the compressor at a third frequency adjustment rate, and not turning on the electromagnetic valve and the expansion valve, the second frequency adjustment rate being greater than the third frequency adjustment rate; 3. The control method of the packaged air conditioning system according to claim 1, wherein detecting operating states of the indoor units when the compressor operates at the increased frequency in a preset period, and obtaining a number of indoor units in a temperature-reached state among the operating states; and decreasing the third frequency adjustment rate when the number exceeds a preset number. ​ ​ 4. The control method of a multi VRF air conditioning system according to claim 3, wherein, The adjusting the frequency of the compressor, the switch state of the electromagnetic valve and the opening degree of the expansion valve according to the energy demand stage comprises: when the energy demand stage is a small energy demand stage, increasing the frequency of the compressor at a fourth frequency adjusting rate, the third frequency adjusting rate being greater than the fourth frequency adjusting rate; detecting a current indoor temperature and a set temperature when the compressor operates at the increased frequency in a preset period; when a temperature difference between the current indoor temperature and the set temperature is within a preset difference range, not opening the electromagnetic valve and the expansion valve; and when the temperature difference between the current indoor temperature and the set temperature is not within the preset difference range, opening the electromagnetic valve and the expansion valve, increasing the opening degree of the expansion valve at a target expansion valve adjusting rate, the target expansion valve adjusting rate being determined by the temperature difference.

5. The control method of a multi VRF air conditioning system according to claim 1, wherein, The multi-split air conditioning system control method further comprises: obtaining an auxiliary inlet temperature and an auxiliary outlet temperature of the economizer; determining a superheat degree of the economizer according to the auxiliary inlet temperature and the auxiliary outlet temperature; and determining a target expansion valve adjusting rate based on a superheat degree range in which the superheat degree is located.

6. The control method of a VRF system according to any one of claims 1 to 4, wherein The multi-split air conditioning system control method further comprises: obtaining a current discharge temperature of the compressor; when the current discharge temperature does not exceed a first preset discharge temperature, performing the step of determining the energy demand stage in which the current energy demand is located; when the current discharge temperature exceeds the first preset discharge temperature, opening the electromagnetic valve and the expansion valve, and increasing the opening degree of the expansion valve at a target expansion valve adjusting rate, the target expansion valve adjusting rate being determined by a temperature difference between the current discharge temperature and a preset discharge temperature; and when the current discharge temperature decreases to below a second preset discharge temperature and lasts for a time period longer than a preset time period, closing the electromagnetic valve and the expansion valve.

7. A multi VRF air conditioning system control device, characterized by comprising: The multi-split air conditioning system comprises a plurality of indoor units and a compressor, the compressor being connected with an economizer, the economizer being connected with an electromagnetic valve and an expansion valve respectively, the compressor being a small-displacement non-injection compressor, and the economizer being used to supplement air and increase enthalpy on a low-pressure side of the multi-split air conditioning system through an auxiliary path of the economizer. The multi-split air conditioning system control device comprises: a detection module configured to determine a current energy demand of the multi-split air conditioning system according to operating states of the indoor units; a judgment module configured to determine an energy demand stage in which the current energy demand is located, wherein the energy demand stage comprises a high energy demand stage, a medium energy demand stage, a low energy demand stage and a small energy demand stage; and an adjustment module configured to adjust a frequency of the compressor, a switch state of the electromagnetic valve and an opening degree of the expansion valve according to the energy demand stage; the adjustment module is further configured to, when the energy demand stage is the high energy demand stage, increase the frequency of the compressor at a first frequency adjusting rate, and open the electromagnetic valve and the expansion valve, increase the opening degree of the expansion valve at a target expansion valve adjusting rate, and maintain the expansion valve at a current opening degree of the expansion valve when the current opening degree reaches a set opening degree threshold. The adjustment module is further configured to increase the frequency of the compressor according to a second frequency adjustment rate when the energy demand stage is a medium energy demand stage, the first frequency adjustment rate being greater than the second frequency adjustment rate; detect the operating states of each indoor unit when the compressor operates at the increased frequency within a preset period, and obtain the number of indoor units whose operating states are temperature reaching states; decrease the second frequency adjustment rate when the number exceeds a preset number; and when the number does not exceed the preset number, open the electromagnetic valve and the expansion valve, increase the opening degree of the expansion valve according to a target expansion valve adjustment rate, and maintain the expansion valve at a current opening degree when the current opening degree of the expansion valve reaches a set opening degree threshold.

8. A multi VRF air conditioning system control device, characterized by comprising: The multi-split air conditioning system control device comprises a memory, a processor, and a multi-split air conditioning system control program stored in the memory and running on the processor, and the multi-split air conditioning system control program is configured to implement the multi-split air conditioning system control method according to any one of claims 1 to 6.

9. A storage medium, characterized by The storage medium stores a multi-split air conditioning system control program, and the multi-split air conditioning system control program is executed by the processor to implement the multi-split air conditioning system control method according to any one of claims 1 to 6.

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