Multi-split air conditioner mute unloading control method and device

Abstract

The invention relates to the field of air conditioners, and provides a multi-split mute unloading control method and device.The method comprises the steps that the multi-split running state and a pressure difference parameter obtained based on the high-pressure pipeline pressure and the low-pressure pipeline pressure of the multi-split are obtained; determining whether the pressure difference parameter conforms to a first preset range or not based on the first running state of the multi-split air conditioner; wherein the first running state is used for representing the state of the multi-split air conditioner running to the moment when the compressor can be closed according to a preset control program in the shutdown residual stage; if the pressure difference parameter accords with a first preset range, the system is controlled to enter a mute unloading mode, and the mute unloading mode is based on controlling an opening adjusting valve and an exhaust temperature electromagnetic control valve of the multi-split air conditioner, so that the corresponding multi-split air conditioner operation state and the pressure difference parameter reach target conditions, and the system is controlled to enter a preset unloading mode. The problem that the production cost and the carbon emission are increased due to extra noise reduction caused by large pressure difference unloading is solved, silent unloading is achieved, and the energy consumption and the operation cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a multi-connected unit silent unloading control method and device. Background Art

[0002] In order to extend the normal service life of the compressor and its front and rear pipelines in a multi-connected unit, certain requirements are generally put forward for the pressure difference between the suction pipeline and the discharge pipeline before starting the compressor and after shutting down the multi-connected unit. Therefore, unloading control is usually required during the startup stage and the shutdown residual stage of the multi-connected unit. The shutdown residual stage refers to the process in which the multi-connected unit receives a shutdown control instruction and executes residual operation control according to its own operating state until it is completely shut down.

[0003] Currently, the control methods for unloading of multi-connected units mostly control the opening of the solenoid valve on the connecting pipeline between the high-pressure gas pipe and the low-pressure gas pipe, so that the gas in the pipe flows under the action of the pressure difference to achieve pressure balance unloading.

[0004] However, controlling the opening of the solenoid valve when the pressure difference between the high-pressure gas pipe and the low-pressure gas pipe is large will cause the gas in the pipe to flow at a high speed, interacting with the pipe wall and valve components to generate a large amount of noise. Supplementing with additional noise reduction measures, such as most of the same type of products covering noise reduction materials on the relevant pipelines or adding pressure reducing components such as capillary tubes in the pipelines for noise reduction, is likely to increase the production cost and carbon emissions of the multi-connected unit, and reduce the user comfort and product competitiveness. Summary of the Invention

[0005] The present invention provides a multi-connected unit silent unloading control method and device to solve the defect in the prior art that large-pressure-difference unloading generates additional noise reduction, increasing production costs and carbon emissions, and to achieve silent unloading, reduce energy consumption and operating costs.

[0006] The present invention provides a multi-connected unit silent unloading control method, including: obtaining the operating state of the multi-connected unit and the pressure difference parameter; wherein, the pressure difference parameter is obtained based on the pressure point parameter of the high-pressure pipeline and the pressure point parameter of the low-pressure pipeline of the multi-connected unit under the operating state; based on the operating state of the multi-connected unit reaching the first operating state, determining whether the pressure difference parameter meets the first preset range; wherein, the first operating state is used to represent the state of the multi-connected unit when it operates according to the preset control program to the moment when the compressor can be shut down during the shutdown residual stage; based on the pressure difference parameter meeting the first preset range, controlling to enter the silent unloading mode, and the silent unloading mode is based on controlling the opening degree regulating valve and the exhaust temperature solenoid control valve of the multi-connected unit, so that the corresponding operating state and pressure difference parameter of the multi-connected unit reach the target conditions, to control to enter the preset unloading mode, and the preset unloading mode refers to controlling the unloading by controlling the opening of the solenoid valve provided on the connecting pipeline between the high-pressure gas pipe and the low-pressure gas pipe.

[0007] It should be noted that by obtaining the operating state of the multi-connected unit and the pressure difference parameter obtained based on the pressure point parameters of the high-pressure pipeline and the pressure point parameters of the low-pressure pipeline, the operating condition of the multi-connected unit system can be comprehensively understood. When the operating state of the multi-connected unit reaches the first operating state, the pressure difference parameter is checked to avoid unnecessary operations at inappropriate times, improve the stability and reliability of the system, and when the pressure difference parameter meets the first preset range, control enters the silent unloading mode. Thus, by controlling the opening degree regulating valve and the exhaust temperature solenoid valve, the operating state of the multi-connected unit and the pressure difference parameter reach the target conditions, preparing for entering the preset unloading mode, gradually adjusting the system parameters on the premise of not affecting the normal operation of the system, achieving a smooth transition, and reducing the noise during the operation of the system.

[0008] According to the present invention, a multi-connected unit silent unloading control method is provided. Based on the pressure difference parameter meeting the first preset range, control enters the silent unloading mode, including: based on the pressure difference parameter meeting the first preset range, controlling the exhaust temperature solenoid valve of the multi-connected unit outdoor unit to open, and controlling the opening degree of the opening degree regulating valve of the multi-connected unit outdoor unit to open to the first preset value, and re-obtaining the operating state of the multi-connected unit and the pressure difference parameter; determining whether the re-obtained operating state of the multi-connected unit reaches the second operating state, and determining whether the re-obtained pressure difference parameter meets the second preset range; wherein, the second operating state is used to represent the multi-connected unit state where the compressor stops running and has no impact on the normal use of the multi-connected unit, the absolute value of the upper limit of the second preset range is not greater than the absolute value of the lower limit of the first preset range, and the absolute value of the lower limit of the second preset range is not greater than the absolute value of the upper limit of the first preset range; based on the re-obtained operating state of the multi-connected unit reaching the second operating state and the re-obtained pressure difference parameter meeting the second preset range, controlling the compressor, the opening degree regulating valve and the exhaust temperature solenoid valve to close, and controlling to enter the preset unloading mode.

[0009] It should be noted that when the pressure difference parameter meets the first preset range, controlling the exhaust temperature solenoid valve to open and the opening degree of the opening degree regulating valve to open to the first preset value to adjust the refrigerant flow rate and pressure in the system, so that the multi-connected unit enters the silent mode, reducing the noise generated during the operation of the system. At the same time, entering the silent unloading mode can reduce the working load of the compressor, thereby reducing energy consumption and achieving the purpose of energy saving; by re-obtaining the operating state of the multi-connected unit and the pressure difference parameter, to ensure that the current operating state reaches the second operating state before entering the next operation, without causing adverse effects on the normal use of users, and thus performing intelligent control based on the pressure difference parameter and the operating state of the multi-connected unit, realizing the refined management of the multi-connected unit system, and improving the operating efficiency and reliability of the system.

[0010] According to a multi-connected air conditioner silent unloading control method provided by the present invention, after controlling the opening of the exhaust temperature electromagnetic control valve of the multi-connected air conditioner outdoor unit and controlling the opening degree of the opening degree regulating valve of the multi-connected air conditioner outdoor unit to a first preset value based on the pressure difference parameter meeting the first preset range, it further includes: obtaining the superheat degree of the exhaust; according to the superheat degree of the exhaust, controlling the opening and closing of the exhaust temperature electromagnetic control valve and the opening degree regulating valve, controlling the opening degree of the opening degree regulating valve, and controlling the compressor frequency and the fan motor rotation frequency, and obtaining the corresponding multi-connected air conditioner operation state and pressure difference parameter.

[0011] It should be noted that after controlling the opening of the exhaust temperature electromagnetic control valve of the multi-connected air conditioner outdoor unit and controlling the opening degree of the opening degree regulating valve of the multi-connected air conditioner outdoor unit to a first preset value based on the pressure difference parameter meeting the first preset range, by obtaining the superheat degree of the exhaust, the operation state of the system can be more accurately understood, so as to timely control the opening and closing and the opening degree of the exhaust temperature electromagnetic control valve and the opening degree regulating valve, automatically adjust according to the real-time operation data, accurately regulate the flow rate and pressure of the refrigerant, achieve precise control of the system temperature and pressure, reduce the probability of failures caused by temperature and pressure fluctuations, and improve the stability and reliability of the system. In addition, by controlling the compressor frequency and the fan motor rotation frequency, it is convenient to adjust the operating speeds of the compressor and the fan according to actual needs, reduce energy consumption and noise while meeting the refrigeration or heating requirements, and further optimize the performance of the system.

[0012] According to a multi-connected air conditioner silent unloading control method provided by the present invention, according to the superheat degree of the exhaust, controlling the opening and closing of the exhaust temperature electromagnetic control valve and the opening degree regulating valve, controlling the opening degree of the opening degree regulating valve, and controlling the compressor frequency and the fan motor rotation frequency, and obtaining the corresponding multi-connected air conditioner operation state and pressure difference parameter, includes: adjusting the compressor frequency to make the compressor frequency consistent with the compressor frequency when controlling to enter the silent unloading mode, and adjusting the fan motor rotation frequency to make the fan motor rotation frequency consistent with the fan motor rotation frequency when controlling to enter the silent unloading mode; determining whether the superheat degree of the exhaust is greater than a first superheat threshold; if the superheat degree of the exhaust is greater than the first superheat threshold, obtaining the corresponding multi-connected air conditioner operation state and pressure difference parameter; otherwise, controlling the exhaust temperature electromagnetic control valve and the opening degree regulating valve to close, and re-obtaining the superheat degree of the exhaust until the re-obtained superheat degree of the exhaust is greater than a second superheat threshold, then re-controlling the opening of the exhaust temperature electromagnetic control valve of the multi-connected air conditioner outdoor unit, and re-controlling the opening degree of the opening degree regulating valve of the multi-connected air conditioner outdoor unit to the first preset value, and obtaining the corresponding multi-connected air conditioner operation state and pressure difference parameter; wherein, the second superheat threshold is greater than the first superheat threshold.

[0013] It should be noted that by adjusting the compressor frequency and the fan motor rotation frequency to be consistent with those when entering the silent unloading mode, the frequency consistency can be maintained at different operating stages. While maintaining the stable operation of the system, system fluctuations caused by excessive frequency changes can be avoided, ensuring that the system can smoothly transition to different working states. By determining whether the exhaust superheat is greater than the first superheat threshold, liquid compression of the compressor can be prevented. At the same time, different measures are taken according to different superheat conditions, so as to more effectively adjust the operating state of the system and improve the performance of the system. When the exhaust superheat is greater than the first superheat threshold, by obtaining the corresponding multi-connected unit operating state and pressure difference parameters, the actual situation of the system can be understood in a timely manner, so as to make more accurate adjustments and achieve optimized control of the system. When the exhaust superheat is not greater than the first superheat threshold, the exhaust temperature solenoid valve and the opening degree regulating valve are controlled to close, and the exhaust superheat is obtained again until the newly obtained exhaust superheat is greater than the second superheat threshold. Thus, the control strategy is automatically adjusted according to the actual situation, and the second superheat threshold is set to be greater than the first superheat threshold to avoid frequent adjustments of the system to a certain extent and improve the stability of the system. In addition, by reasonably adjusting the compressor frequency, the fan motor rotation frequency, and the opening degrees of the control valve and the regulating valve, the system can minimize energy consumption as much as possible while meeting the requirements, improve the refrigeration or heating effect of the system, and provide a more comfortable environment for users.

[0014] According to a multi-connected unit silent unloading control method provided by the present invention, obtaining the exhaust superheat includes: based on a pressure sensor and a temperature sensor arranged on the exhaust pipe between the compressor and the four-way valve, respectively obtaining the exhaust pressure and the actual exhaust temperature; according to the exhaust pressure, obtaining the corresponding saturation temperature according to the thermodynamic property chart of the refrigerant; and obtaining the exhaust superheat according to the actual exhaust temperature and the saturation temperature.

[0015] It should be supplemented that by obtaining the pressure sensor and the temperature sensor arranged on the exhaust pipe between the compressor and the four-way valve, the two key parameters of the exhaust pressure and the actual exhaust temperature can be directly and accurately obtained. While minimizing the measurement error to the greatest extent, the change of the system operating state can be quickly responded to, and the thermodynamic property chart of the refrigerant is used to obtain the corresponding saturation temperature according to the exhaust pressure to accurately determine the saturation temperature of the refrigerant under a specific pressure. Thus, combined with the actual exhaust temperature, the exhaust superheat can be quickly and accurately obtained, and the operating condition of the system can be timely feedback, providing support for the real-time control and adjustment of the system.

[0016] According to a multi-connected unit silent unloading control method provided by the present invention, it is determined whether the re-acquired operating state of the multi-connected unit reaches a second operating state, and it is determined whether the re-acquired pressure difference parameter conforms to a second preset range. It further includes: based on the fact that the re-acquired operating state of the multi-connected unit does not reach the second operating state or the re-acquired pressure difference parameter does not conform to the second preset range, re-acquire the exhaust superheat degree, and control the opening and closing of the exhaust temperature solenoid valve and the opening degree regulating valve according to the re-acquired exhaust superheat degree, control the opening degree of the opening degree regulating valve, and control the compressor frequency and the fan motor rotation frequency until the corresponding operating state of the multi-connected unit reaches the second operating state and the corresponding pressure difference parameter conforms to the second preset range.

[0017] It should be added that when the re-acquired operating state of the multi-connected unit does not reach the second operating state or the pressure difference parameter does not conform to the second preset range, by re-acquiring the exhaust superheat degree and controlling the exhaust temperature solenoid valve, the opening degree regulating valve, the compressor frequency and the fan motor rotation frequency, the operating parameters of the system can be accurately adjusted, so that the system can be continuously optimized according to the actual operating conditions, thereby adapting to different operating conditions and requirements, improving the performance and efficiency of the system, and reducing energy consumption and operating costs.

[0018] According to a multi-connected unit silent unloading control method provided by the present invention, it is determined whether the pressure difference parameter conforms to a first preset range. It further includes: based on the fact that the pressure difference parameter does not conform to the first preset range, control the compressor to shut down and control to enter a preset unloading mode.

[0019] It should be noted that when the pressure difference parameter does not conform to the first preset range, by controlling the compressor to shut down and controlling to enter the preset unloading mode, the pressure and load of the system can be effectively reduced, the influence of abnormal pressure on the system can be alleviated, unnecessary energy consumption can be reduced, and the purpose of energy saving can be achieved. In addition, the preset unloading mode controls the unloading by controlling the opening of the solenoid valve arranged on the connecting pipeline between the high-pressure gas pipe and the low-pressure gas pipe, effectively regulating the pressure of the system. When unloading is required, the system pressure can be quickly and accurately reduced, avoiding damage to the system caused by excessive pressure. At the same time, this method can enable the system to switch smoothly between different working states, improving the adaptability and reliability of the system.

[0020] The present invention also provides a multi-connected unit silent unloading control device, including: a data acquisition module, which acquires the operating state of the multi-connected unit and the pressure difference parameter; wherein, the pressure difference parameter is obtained based on the high-pressure pipeline pressure point parameter and the low-pressure pipeline pressure point parameter under the operating state of the multi-connected unit; a state judgment module, which determines whether the pressure difference parameter conforms to a first preset range based on the operating state of the multi-connected unit reaching a first operating state; wherein, the first operating state is used to represent the state of the multi-connected unit when it operates according to a preset control program to the moment when the compressor can be shut down during the shutdown residual stage; an unloading control module, which controls to enter the silent unloading mode based on the pressure difference parameter conforming to the first preset range, and the silent unloading mode is based on controlling the opening degree regulating valve and the exhaust temperature solenoid valve of the multi-connected unit to make the corresponding multi-connected unit operating state and pressure difference parameter reach the target conditions, so as to control to enter the preset unloading mode, and the preset unloading mode refers to controlling the unloading by opening the solenoid valve arranged on the connecting pipe of the high-pressure gas pipe and the low-pressure gas pipe.

[0021] It should be noted that the data acquisition module acquires the operating state of the multi-connected unit and the pressure difference parameter obtained based on the high-pressure pipeline pressure point parameter and the low-pressure pipeline pressure point parameter, so as to comprehensively understand the operating conditions of the multi-connected unit system, and the state judgment module checks the pressure difference parameter when the operating state of the multi-connected unit reaches the first operating state, so as to avoid unnecessary operations at inappropriate times, improve the stability and reliability of the system, and when the pressure difference parameter conforms to the first preset range, the unloading control module controls to enter the silent unloading mode, so as to make the multi-connected unit operating state and pressure difference parameter reach the target conditions by controlling the opening degree regulating valve and the exhaust temperature solenoid valve, and prepare for entering the preset unloading mode, and gradually adjust the system parameters on the premise of not affecting the normal operation of the system to achieve a smooth transition and reduce the noise during the operation of the system.

[0022] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the multi-connected unit silent unloading control method as described in any one of the above are implemented.

[0023] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the multi-connected unit silent unloading control method as described in any one of the above are implemented. Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is a schematic flowchart of the multi-connected unit silent unloading control method provided by the present invention; Figure 2 is a schematic structural diagram of the multi-connected unit provided by the present invention; Figure 3 is a schematic structural diagram of the multi-connected unit silent unloading control device provided by the present invention; Figure 4 is a schematic structural diagram of the electronic device provided by the present invention. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0027] Figure 1 Describes a schematic flowchart of a multi-connected unit silent unloading control method of the present invention. The method includes: S11, obtaining the operating state of the multi-connected unit and the pressure difference parameter; wherein, the pressure difference parameter is obtained based on the high-pressure pipeline pressure point parameter and the low-pressure pipeline pressure point parameter of the multi-connected unit under the operating state; S12, based on the operating state of the multi-connected unit reaching the first operating state, determining whether the pressure difference parameter meets the first preset range; wherein, the first operating state is used to represent the state of the multi-connected unit when it runs to the compressor shutdown moment according to the preset control program during the shutdown residual stage; S13, based on the pressure difference parameter meeting the first preset range, controlling to enter the silent unloading mode. The silent unloading mode is based on controlling the opening degree regulating valve and the exhaust temperature solenoid valve of the multi-connected unit to make the corresponding multi-connected unit operating state and pressure difference parameter reach the target conditions, so as to control to enter the preset unloading mode. The preset unloading mode refers to controlling the unloading by opening the solenoid valve provided on the connecting pipe between the high-pressure air pipe and the low-pressure air pipe.

[0028] It should be noted that the step numbers "S1N" in this specification do not represent the sequence of the multi-connected unit silent unloading control method. The following specifically combines Figure 2Describe the multi-connected unit silent unloading control method of the present invention.

[0029] Step S11, obtain the operating state of the multi-connected unit and the pressure difference parameter; wherein, the pressure difference parameter is obtained based on the pressure point parameter of the high-pressure pipeline of the multi-connected unit and the pressure point parameter of the low-pressure pipeline under the operating state of the multi-connected unit.

[0030] It should be noted that the operating state of the multi-connected unit includes the temperature detected by the outdoor unit temperature sensor and the pressure detected by the outdoor unit pressure sensor. In addition, the operating state of the multi-connected unit also includes the rotational speed of the compressor fan, the rotational speed of the compressor, the compressor current, the fan current, etc., which can be specifically obtained according to the actually set first operating state and second operating state. The first operating state and the second operating state can be referred to as described below and will not be further elaborated here.

[0031] Step S12, based on the operating state of the multi-connected unit reaching the first operating state, determine whether the pressure difference parameter meets the first preset range; wherein, the first operating state is used to represent the state of the multi-connected unit when it runs to the moment when the compressor can be shut down according to the preset control program in the shutdown residual stage.

[0032] It should be noted that the shutdown residual stage is used to represent the process of the multi-connected unit receiving the shutdown control instruction and performing the residual operation control to complete shutdown according to its own operating state. In addition, since a large noise pollution will be generated when directly unloading due to the excessive pressure difference parameter determined based on the pressure point parameter of the high-pressure pipeline and the pressure point parameter of the low-pressure pipeline, the first preset range can be determined according to the pressure difference range that actually generates noise pollution and will not be further limited here.

[0033] In this embodiment, before determining whether the pressure difference parameter meets the first preset range based on the operating state of the multi-connected unit reaching the first operating state, it includes: respectively comparing the parameters involved in the operating state of the multi-connected unit with the corresponding parameter thresholds, and determining that the operating state of the multi-connected unit reaches the first operating state based on the parameters involved in the operating state of the multi-connected unit all reaching the corresponding parameter thresholds.

[0034] It is worth noting that affected by factors such as the running time of the compressor, the indoor-outdoor temperature difference, and the load rate, parameters such as pressure and temperature in the system are in different stable or changing stages. Therefore, the corresponding parameter thresholds can be set according to factors such as the running time of the compressor, the indoor-outdoor temperature difference, and the load rate, and will not be further limited here.

[0035] Step S13: Based on the pressure difference parameter meeting the first preset range, control to enter the silent unloading mode. The silent unloading mode is based on controlling the opening degree regulating valve and the exhaust temperature solenoid valve of the multi-connected unit to make the corresponding operating state of the multi-connected unit and the pressure difference parameter reach the target conditions, so as to control to enter the preset unloading mode. The preset unloading mode means controlling the opening of the solenoid valve provided on the connecting pipe between the high-pressure gas pipe and the low-pressure gas pipe to control unloading.

[0036] In this embodiment, based on the pressure difference parameter meeting the first preset range, controlling to enter the silent unloading mode includes: based on the pressure difference parameter meeting the first preset range, controlling the exhaust temperature solenoid valve of the outdoor unit of the multi-connected unit to open, and controlling the opening degree of the opening degree regulating valve of the outdoor unit of the multi-connected unit to open to the first preset value, and re-obtaining the operating state of the multi-connected unit and the pressure difference parameter; determining whether the re-obtained operating state of the multi-connected unit reaches the second operating state, and determining whether the re-obtained pressure difference parameter meets the second preset range; wherein, the second operating state is used to represent the state of the multi-connected unit where the compressor stops running and has no impact on the normal use of the multi-connected unit. The absolute value of the upper limit of the second preset range is not greater than the absolute value of the lower limit of the first preset range, and the absolute value of the lower limit of the second preset range is not greater than the absolute value of the upper limit of the first preset range; based on the re-obtained operating state of the multi-connected unit reaching the second operating state and the re-obtained pressure difference parameter meeting the second preset range, controlling the compressor, the opening degree regulating valve and the exhaust temperature solenoid valve to close, and controlling to enter the preset unloading mode.

[0037] It should be noted that when the pressure difference parameter meets the first preset range, controlling the exhaust temperature solenoid valve to open and the opening degree of the opening degree regulating valve to open to the first preset value to adjust the refrigerant flow rate and pressure in the system, so that the multi-connected unit enters the silent mode, reducing the noise generated during system operation. At the same time, entering the silent unloading mode can reduce the working load of the compressor, thereby reducing energy consumption and achieving the purpose of energy saving; by re-obtaining the operating state of the multi-connected unit and the pressure difference parameter, before entering the next operation, it is ensured that the current operating state reaches the second operating state and will not cause adverse effects on the normal use of users, so as to perform intelligent control based on the pressure difference parameter and the operating state of the multi-connected unit, realize the refined management of the multi-connected unit system, and improve the operating efficiency and reliability of the system.

[0038] Furthermore, in order to prevent liquid compression and shorten the adjustment duration, the first preset value can be set according to the full-open step number of the actual electronic expansion valve stepping motor, for example, between half and one-quarter of the full-open step number of the electronic expansion valve stepping motor, and no further limitation is made here.

[0039] In addition, the second operating state can be determined according to the actual stop control logic of the compressor. For example, the stop control logic of a certain compressor is to adjust from the current operating frequency to the target frequency and then turn off to a frequency of 0. Accordingly, the second operating state is the state where the target frequency is located, and no further limitation is made here.

[0040] It should be added that the multi-connected air conditioner includes an outdoor unit and multiple indoor units. Refer to Figure 2 , the outdoor unit includes a compressor 1, an oil separator 2, a check valve 3, a four-way valve 4, a heat exchanger 5, an exhaust temperature adjustment module 6, a solenoid valve 7, a liquid pipe stop valve 8 and a gas pipe stop valve 9. The exhaust temperature adjustment module 6 includes a heat exchange element 61, an exhaust temperature solenoid control valve 62 and an opening adjustment valve 63. The compressor 1 is connected to the oil separator 2. The oil separator 2 is connected to the four-way valve 4 and the solenoid valve 7 through the check valve 3. The four-way valve 4 is connected to the gas pipe stop valve 9, the solenoid valve 7 and the heat exchanger 5. The exhaust temperature solenoid control valve 62 is connected to the solenoid valve 7 and the heat exchange element 61. The heat exchange element 61 is respectively connected to the opening adjustment valve 63 and the heat exchanger 5.

[0041] Furthermore, as the core power component of the refrigeration system, the compressor is used to suck in the gaseous refrigerant at low temperature and low pressure, compress it into a gaseous refrigerant at high temperature and high pressure and output it, providing power for the circulating flow of the refrigerant in the system; the oil separator is used to separate the lubricating oil in the high-pressure steam discharged from the refrigeration compressor, prevent a large amount of refrigeration oil from entering the refrigeration system, ensure the normal operation of the refrigeration system, and at the same time avoid the failure of the compressor due to lack of oil. Moreover, by separating the oil and the refrigerant, the heat transfer effect in the condenser and evaporator can also be improved; the check valve is used to prevent the reverse flow of the refrigerant, avoid high-pressure gas from entering the compressor, and quickly balance the pressure of the compressor's suction and discharge; the four-way valve is used to switch the refrigerant flow direction by turning on and off the current of the electromagnetic coil, so as to realize the switching between the refrigeration or heating mode; when the heat exchanger is used as a condenser in the refrigeration mode, it cools the high-temperature and high-pressure gaseous refrigerant from the compressor, making it become a high-pressure liquid refrigerant, and at the same time releases heat to the surrounding environment. When it is used as an evaporator in the heating mode, the low-pressure liquid refrigerant absorbs the heat of the outdoor air in the heat exchanger and evaporates into a gaseous refrigerant, thereby providing heat for the indoor; the heat exchange element plays an auxiliary role in heat exchange, cooperates with the exhaust temperature electromagnetic control valve to perform heat exchange treatment on the high-temperature gas discharged from the compressor, and cooperates with the opening regulating valve to adjust the flow rate and intensity of heat exchange, so as to achieve precise control of system parameters such as temperature and pressure; the exhaust temperature electromagnetic control valve acts as a liquid injection cooling. When the exhaust temperature is too high, this valve is opened to throttle the high-pressure and medium-temperature refrigerant into a low-temperature and low-pressure refrigerant, and spray it to the return air pipe to reduce the return air temperature, thereby adjusting the exhaust temperature; the opening regulating valve is used to open this valve when the ambient temperature is too high or the indoor unit coil temperature is too high in the heating mode, and only use the lower half of the outdoor heat exchanger to reduce the indoor unit coil temperature and ensure the system reliability; the solenoid valve is used to control the flow direction of the refrigerant, adjust the system pressure and flow rate, and cooperate with components such as the oil separator, check valve, and four-way valve to realize the normal operation and various function switches of the system; the liquid pipe stop valve plays a role in cutting off the refrigerant, is used to connect the indoor unit, and control the flow of the refrigerant between the indoor unit and the outdoor unit; the gas pipe stop valve is similar to the liquid pipe stop valve, and is also used to cut off the refrigerant, connect the indoor unit, and control the flow of the refrigerant.

[0042] In an alternative embodiment, after controlling the opening of the exhaust temperature electromagnetic control valve of the multi-connected outdoor unit and controlling the opening of the opening regulating valve of the multi-connected outdoor unit to a first preset value based on the pressure difference parameter conforming to the first preset range, it further includes: obtaining the superheat degree of the exhaust; according to the superheat degree of the exhaust, controlling the opening and closing of the exhaust temperature electromagnetic control valve and the opening regulating valve, controlling the opening of the opening regulating valve, and controlling the compressor frequency and the fan motor rotation frequency, and obtaining the corresponding multi-connected operation state and pressure difference parameter.

[0043] It should be noted that after controlling the opening of the exhaust temperature electromagnetic control valve of the multi-connected outdoor unit and the opening of the opening regulating valve of the multi-connected outdoor unit to the first preset value based on the pressure difference parameter meeting the first preset range, the superheat of the exhaust is obtained to more accurately understand the operating state of the system, so as to timely control the opening and closing and the opening of the exhaust temperature electromagnetic control valve and the opening regulating valve, automatically adjust according to the real-time operating data, accurately adjust the flow rate and pressure of the refrigerant, achieve precise control of the system temperature and pressure, reduce the probability of failures caused by temperature and pressure fluctuations, and improve the stability and reliability of the system. In addition, by controlling the compressor frequency and the fan motor rotation frequency, the operating speeds of the compressor and the fan can be adjusted according to actual needs, reducing energy consumption and noise while meeting the cooling or heating requirements, and further optimizing the performance of the system.

[0044] Furthermore, according to the superheat of the exhaust, control the opening and closing of the exhaust temperature electromagnetic control valve and the opening regulating valve, control the opening of the opening regulating valve, and control the compressor frequency and the fan motor rotation frequency, and obtain the corresponding operating state and pressure difference parameter of the multi-connected unit, including: adjusting the compressor frequency to make the compressor frequency consistent with the compressor frequency when controlling to enter the silent unloading mode, and adjusting the fan motor rotation frequency to make the fan motor rotation frequency consistent with the fan motor rotation frequency when controlling to enter the silent unloading mode; determining whether the superheat of the exhaust is greater than the first superheat threshold; if the superheat of the exhaust is greater than the first superheat threshold, obtain the corresponding operating state and pressure difference parameter of the multi-connected unit; otherwise, control the exhaust temperature electromagnetic control valve and the opening regulating valve to close, and re-obtain the superheat of the exhaust until the re-obtained superheat of the exhaust is greater than the second superheat threshold, then re-control the opening of the exhaust temperature electromagnetic control valve of the multi-connected outdoor unit, and re-control the opening of the opening regulating valve of the multi-connected outdoor unit to the first preset value, and obtain the corresponding operating state and pressure difference parameter of the multi-connected unit; where the second superheat threshold is greater than the first superheat threshold.

[0045] It should be noted that by adjusting the compressor frequency and the fan motor rotation frequency to be consistent with when entering the silent unloading mode, the frequency consistency can be maintained at different operating stages. While maintaining the stable operation of the system, it is possible to avoid system fluctuations caused by excessive frequency changes and ensure that the system can smoothly transition to different working states; by determining whether the exhaust superheat degree is greater than the first superheat degree threshold, it is possible to prevent liquid compression of the compressor. At the same time, different measures are taken according to different superheat degree situations, thereby more effectively adjusting the operating state of the system and improving the performance of the system; when the exhaust superheat degree is greater than the first superheat degree threshold, by obtaining the corresponding multi-connected unit operating state and pressure difference parameters, the actual situation of the system can be understood in a timely manner, so as to make more accurate adjustments and achieve optimized control of the system; when the exhaust superheat degree is not greater than the first superheat degree threshold, the exhaust temperature solenoid valve and the opening degree regulating valve are controlled to close, and the exhaust superheat degree is obtained again until the re-obtained exhaust superheat degree is greater than the second superheat degree threshold. Thus, the control strategy is automatically adjusted according to the actual situation, and the second superheat degree threshold is set to be greater than the first superheat degree threshold to avoid frequent adjustments of the system to a certain extent and improve the stability of the system. In addition, by reasonably adjusting the compressor frequency, the fan motor rotation frequency, and the opening degrees of the control valve and the regulating valve, the system can reduce energy consumption as much as possible while meeting the requirements, improve the refrigeration or heating effect of the system, and provide a more comfortable environment for users.

[0046] It is worth noting that the difference between the second superheat degree threshold and the first superheat degree threshold can be set according to the control of the valve and the entire control duration. For example, the second superheat degree threshold can be 5°C greater than the first superheat degree threshold, so as to avoid repeated fluctuations in the valve control and avoid an overly long duration of the entire process.

[0047] In addition, obtaining the exhaust superheat degree includes: respectively obtaining the exhaust pressure and the actual exhaust temperature based on the pressure sensor and the temperature sensor provided on the exhaust pipe between the compressor and the four-way valve; obtaining the corresponding saturation temperature according to the exhaust pressure based on the thermodynamic property chart of the refrigerant; and obtaining the exhaust superheat degree based on the actual exhaust temperature and the saturation temperature.

[0048] It should be added that by obtaining the pressure sensor and the temperature sensor provided on the exhaust pipe between the compressor and the four-way valve, the two key parameters of the exhaust pressure and the actual exhaust temperature can be directly and accurately obtained. While minimizing the measurement error to the greatest extent, it can quickly respond to changes in the system operating state, and use the thermodynamic property chart of the refrigerant to obtain the corresponding saturation temperature according to the exhaust pressure to accurately determine the saturation temperature of the refrigerant at a specific pressure. Thus, combined with the actual exhaust temperature, the exhaust superheat degree can be quickly and accurately obtained, and the operating situation of the system can be timely feedback, providing support for the real-time control and adjustment of the system.

[0049] In addition, the superheat degree of the exhaust gas can be determined based on the difference between the actual exhaust gas temperature and the saturation temperature.

[0050] In an alternative embodiment, determining whether the re-acquired multi-connected unit operating state reaches the second operating state and determining whether the re-acquired pressure difference parameter conforms to the second preset range further includes: based on the fact that the re-acquired multi-connected unit operating state does not reach the second operating state or the re-acquired pressure difference parameter does not conform to the second preset range, re-acquiring the superheat degree of the exhaust gas, and controlling the opening and closing of the exhaust gas temperature electromagnetic control valve and the opening degree regulating valve according to the re-acquired superheat degree of the exhaust gas, controlling the opening degree of the opening degree regulating valve, and controlling the compressor frequency and the fan motor rotation frequency until the corresponding multi-connected unit operating state reaches the second operating state and the corresponding pressure difference parameter conforms to the second preset range.

[0051] It should be added that when the re-acquired multi-connected unit operating state does not reach the second operating state or the pressure difference parameter does not conform to the second preset range, by re-acquiring the superheat degree of the exhaust gas and controlling the exhaust gas temperature electromagnetic control valve, the opening degree regulating valve, the compressor frequency and the fan motor rotation frequency, the operating parameters of the system can be accurately adjusted, so that the system continuously optimizes according to the actual operating conditions, thereby adapting to different operating conditions and requirements, improving the performance and efficiency of the system, and reducing energy consumption and operating costs.

[0052] In an alternative embodiment, determining whether the pressure difference parameter conforms to the first preset range further includes: based on the fact that the pressure difference parameter does not conform to the first preset range, controlling the compressor to shut down and controlling to enter a preset unloading mode.

[0053] It should be noted that when the pressure difference parameter does not conform to the first preset range, by controlling the compressor to shut down and controlling to enter a preset unloading mode, the pressure and load of the system can be effectively reduced, the impact of abnormal pressure on the system can be alleviated, unnecessary energy consumption can be reduced, and the purpose of energy saving can be achieved. In addition, the preset unloading mode controls the unloading by controlling the opening of the solenoid valve provided on the connecting pipeline between the high-pressure air pipe and the low-pressure air pipe, effectively regulating the pressure of the system. When unloading is required, the system pressure can be quickly and accurately reduced, avoiding damage to the system caused by excessive pressure. At the same time, this method can enable the system to smoothly switch between different working states, improving the adaptability and reliability of the system.

[0054] In summary, in the embodiment of the present invention, the operating state of the multi-connected unit and the pressure difference parameter obtained based on the pressure point parameter of the high-pressure pipeline and the pressure point parameter of the low-pressure pipeline are acquired to comprehensively understand the operating condition of the multi-connected unit system. When the operating state of the multi-connected unit reaches the first operating state, the pressure difference parameter is checked to avoid unnecessary operations at inappropriate times, improve the stability and reliability of the system, and when the pressure difference parameter meets the first preset range, control to enter the silent unloading mode. Thus, by controlling the opening degree regulating valve and the exhaust temperature solenoid valve, the operating state of the multi-connected unit and the pressure difference parameter reach the target conditions to prepare for entering the preset unloading mode, and on the premise of not affecting the normal operation of the system, the system parameters are gradually adjusted to achieve a smooth transition and reduce the noise during the operation of the system.

[0055] The multi-connected unit silent unloading control device provided by the present invention will be described below. The multi-connected unit silent unloading control device described below can be correspondingly referred to the multi-connected unit silent unloading control method described above.

[0056] Figure 3 The structural schematic diagram of a multi-connected unit silent unloading control device is shown. The device includes: A data acquisition module 31 that acquires the operating state of the multi-connected unit and the pressure difference parameter; wherein, the pressure difference parameter is obtained based on the pressure point parameter of the high-pressure pipeline and the pressure point parameter of the low-pressure pipeline of the multi-connected unit under the operating state. A state judgment module 32 that determines whether the pressure difference parameter meets the first preset range based on the operating state of the multi-connected unit reaching the first operating state; wherein, the first operating state is used to represent the state of the multi-connected unit when it runs according to the preset control program to the moment when the compressor can be shut down during the shutdown residual stage. An unloading control module 33 that controls to enter the silent unloading mode based on the pressure difference parameter meeting the first preset range. The silent unloading mode is based on controlling the opening degree regulating valve and the exhaust temperature solenoid valve of the multi-connected unit to make the corresponding operating state of the multi-connected unit and the pressure difference parameter reach the target conditions to control to enter the preset unloading mode. The preset unloading mode refers to controlling the unloading by opening the solenoid valve provided on the connecting pipe of the high-pressure gas pipe and the low-pressure gas pipe.

[0057] It should be noted that the operating state of the multi-connected unit includes the temperature detected by the outdoor unit temperature sensor and the pressure detected by the outdoor unit pressure sensor. In addition, the shutdown residual stage is used to represent the process of the multi-connected unit receiving the shutdown control instruction and performing the residual operation control according to its own operating state until it is completely shut down.

[0058] In an alternative embodiment, the status determination module 32 is further configured to: before determining whether the pressure difference parameter meets the first preset range based on the multi-connected unit running status reaching the first running state, compare the parameters related to the multi-connected unit running status with the corresponding parameter thresholds respectively, and determine that the multi-connected unit running status reaches the first running state based on that all the parameters related to the multi-connected unit running status reach the corresponding parameter thresholds.

[0059] In this embodiment, the unloading control module 33 includes: a first control unit, which controls the opening of the exhaust temperature electromagnetic control valve of the multi-connected unit outdoor unit and controls the opening degree of the opening degree regulating valve of the multi-connected unit outdoor unit to the first preset value based on the pressure difference parameter meeting the first preset range, and re-obtains the multi-connected unit running status and the pressure difference parameter; a first judgment unit, which determines whether the re-obtained multi-connected unit running status reaches the second running state and determines whether the re-obtained pressure difference parameter meets the second preset range; wherein, the second running state is used to represent the multi-connected unit state where the compressor stops running and has no impact on the normal use of the multi-connected unit, the absolute value of the upper limit of the second preset range is not greater than the absolute value of the lower limit of the first preset range, and the absolute value of the lower limit of the second preset range is not greater than the absolute value of the upper limit of the first preset range; a second control unit, which controls the compressor, the opening degree regulating valve and the exhaust temperature electromagnetic control valve to close and controls to enter the preset unloading mode based on the re-obtained multi-connected unit running status reaching the second running state and the re-obtained pressure difference parameter meeting the second preset range.

[0060] In an alternative embodiment, the unloading control module 33 further includes: a superheat degree acquisition unit, which acquires the exhaust superheat degree after controlling the opening of the exhaust temperature electromagnetic control valve of the multi-connected unit outdoor unit and controlling the opening degree of the opening degree regulating valve of the multi-connected unit outdoor unit to the first preset value based on the pressure difference parameter meeting the first preset range; an adjustment unit, which controls the opening and closing of the exhaust temperature electromagnetic control valve and the opening degree regulating valve according to the exhaust superheat degree, controls the opening degree of the opening degree regulating valve, and controls the compressor frequency and the fan motor rotation frequency, and acquires the corresponding multi-connected unit running status and the pressure difference parameter.

[0061] Furthermore, the adjustment unit includes: a first adjustment subunit that adjusts the compressor frequency to be consistent with the compressor frequency when controlling entry into the silent unloading mode, and adjusts the fan motor rotation frequency to be consistent with the fan motor rotation frequency when controlling entry into the silent unloading mode; a first judgment subunit that determines whether the exhaust superheat degree is greater than a first superheat degree threshold; a data acquisition subunit that, if the exhaust superheat degree is greater than the first superheat degree threshold, acquires the corresponding multi-connected unit operation state and pressure difference parameter; otherwise, a second adjustment subunit that controls the exhaust temperature solenoid valve and the opening degree adjustment valve to close, and reacquires the exhaust superheat degree until the reacquired exhaust superheat degree is greater than a second superheat degree threshold, then controls the exhaust temperature solenoid valve of the multi-connected unit outdoor unit to open again, and controls the opening degree of the opening degree adjustment valve of the multi-connected unit outdoor unit to open to a first preset value again, and acquires the corresponding multi-connected unit operation state and pressure difference parameter; wherein, the second superheat degree threshold is greater than the first superheat degree threshold.

[0062] In addition, the superheat degree acquisition unit includes: a data acquisition subunit that respectively acquires the exhaust pressure and the actual exhaust temperature based on a pressure sensor and a temperature sensor provided on the exhaust pipe between the compressor and the four-way valve; a saturation temperature determination subunit that acquires the corresponding saturation temperature according to the exhaust pressure and the refrigerant thermodynamic property chart; a superheat degree acquisition subunit that obtains the exhaust superheat degree according to the actual exhaust temperature and the saturation temperature.

[0063] In summary, in the embodiment of the present invention, the multi-connected unit operation state and the pressure difference parameter obtained based on the high-pressure pipeline pressure point parameter and the low-pressure pipeline pressure point parameter are acquired through the data acquisition module to comprehensively understand the operation of the multi-connected unit system, and when the multi-connected unit operation state reaches the first operation state through the state judgment module, the pressure difference parameter is checked to avoid unnecessary operations at inappropriate times, improve the stability and reliability of the system, and when the pressure difference parameter meets the first preset range, the unloading control module is controlled to enter the silent unloading mode, so that the multi-connected unit operation state and the pressure difference parameter reach the target conditions through controlling the opening degree adjustment valve and the exhaust temperature solenoid valve, prepare for entering the preset unloading mode, gradually adjust the system parameters on the premise of not affecting the normal operation of the system, achieve a smooth transition, and reduce the noise during the system operation.

[0064] Figure 4 An example of a schematic physical structure diagram of an electronic device is shown in Figure 4As shown in the figure, the electronic device may include: a processor 410, a communications interface 420, a memory 430, and a communication bus 440. Among them, the processor 410, the communications interface 420, and the memory 430 complete communication with each other through the communication bus 440. The processor 410 may call logic instructions in the memory 430 to execute the multi-connected unit silent unloading control method, which includes: obtaining the operating state of the multi-connected unit and the pressure difference parameter; where the pressure difference parameter is obtained based on the high-pressure pipeline pressure point parameter and the low-pressure pipeline pressure point parameter of the multi-connected unit under the operating state; based on the operating state of the multi-connected unit reaching the first operating state, determining whether the pressure difference parameter meets the first preset range; where the first operating state is used to represent the state of the multi-connected unit when it operates according to a preset control program to the moment when the compressor can be shut down in the shutdown residual stage; based on the pressure difference parameter meeting the first preset range, controlling to enter the silent unloading mode. The silent unloading mode is based on controlling the opening degree regulating valve and the exhaust temperature solenoid valve of the multi-connected unit to make the corresponding multi-connected unit operating state and pressure difference parameter reach the target conditions, so as to control to enter the preset unloading mode. The preset unloading mode refers to controlling the unloading by opening the solenoid valve provided on the connecting pipe between the high-pressure gas pipe and the low-pressure gas pipe.

[0065] In addition, when the logic instructions in the above-mentioned memory 430 can be implemented in the form of software function units and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0066] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the multi-connected unit silent unloading control method provided by each of the above methods. The method includes: obtaining the operating state of the multi-connected unit and the pressure difference parameter; wherein, the pressure difference parameter is obtained based on the pressure point parameters of the high-pressure pipeline and the low-pressure pipeline of the multi-connected unit under the operating state of the multi-connected unit; based on the operating state of the multi-connected unit reaching the first operating state, determining whether the pressure difference parameter conforms to the first preset range; wherein, the first operating state is used to represent the state of the multi-connected unit when it operates according to a preset control program to the moment when the compressor can be shut down during the shutdown residual stage; based on the pressure difference parameter conforming to the first preset range, controlling to enter the silent unloading mode. The silent unloading mode is based on controlling the opening degree regulating valve and the exhaust temperature solenoid valve of the multi-connected unit to make the corresponding operating state and pressure difference parameter of the multi-connected unit reach the target conditions, so as to control to enter the preset unloading mode. The preset unloading mode refers to controlling the unloading by controlling the opening of the solenoid valve provided on the connecting pipe between the high-pressure gas pipe and the low-pressure gas pipe.

[0067] In another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the multi-connected unit silent unloading control method provided by each of the above. The method includes: obtaining the operating state of the multi-connected unit and the pressure difference parameter; wherein, the pressure difference parameter is obtained based on the pressure point parameters of the high-pressure pipeline and the low-pressure pipeline of the multi-connected unit under the operating state of the multi-connected unit; based on the operating state of the multi-connected unit reaching the first operating state, determining whether the pressure difference parameter conforms to the first preset range; wherein, the first operating state is used to represent the state of the multi-connected unit when it operates according to a preset control program to the moment when the compressor can be shut down during the shutdown residual stage; based on the pressure difference parameter conforming to the first preset range, controlling to enter the silent unloading mode. The silent unloading mode is based on controlling the opening degree regulating valve and the exhaust temperature solenoid valve of the multi-connected unit to make the corresponding operating state and pressure difference parameter of the multi-connected unit reach the target conditions, so as to control to enter the preset unloading mode. The preset unloading mode refers to controlling the unloading by controlling the opening of the solenoid valve provided on the connecting pipe between the high-pressure gas pipe and the low-pressure gas pipe.

[0068] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0069] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-connected air conditioner silent unloading control method, characterized in that, Including: Obtaining the operating state of the multi-connected air conditioner and the pressure difference parameter; wherein, the pressure difference parameter is obtained based on the pressure point parameter of the high-pressure pipeline and the pressure point parameter of the low-pressure pipeline of the multi-connected air conditioner under the operating state of the multi-connected air conditioner; Based on the operating state of the multi-connected air conditioner reaching the first operating state, determining whether the pressure difference parameter meets the first preset range; wherein, the first operating state is used to represent the state of the multi-connected air conditioner when it operates according to a preset control program to the moment when the compressor can be shut down during the shutdown residual stage; Based on the pressure difference parameter meeting the first preset range, controlling to enter the silent unloading mode, and the silent unloading mode is based on controlling the opening degree regulating valve and the exhaust temperature solenoid valve of the multi-connected air conditioner to make the corresponding operating state and pressure difference parameter of the multi-connected air conditioner reach the target conditions, so as to control to enter the preset unloading mode, and the preset unloading mode refers to controlling the unloading by opening the solenoid valve arranged on the connecting pipeline between the high-pressure gas pipe and the low-pressure gas pipe; 2. The multi-connected unit silent unloading control method according to claim 1, wherein Based on the pressure difference parameter meeting the first preset range, controlling to enter the silent unloading mode, including: Based on the pressure difference parameter meeting the first preset range, controlling the exhaust temperature solenoid valve of the outdoor unit of the multi-connected air conditioner to open, and controlling the opening degree of the opening degree regulating valve of the outdoor unit of the multi-connected air conditioner to open to the first preset value, and re-obtaining the operating state of the multi-connected air conditioner and the pressure difference parameter; Determining whether the re-obtained operating state of the multi-connected air conditioner reaches the second operating state, and determining whether the re-obtained pressure difference parameter meets the second preset range; wherein, the second operating state is used to represent the state of the multi-connected air conditioner when the normal use of the multi-connected air conditioner is not affected by the shutdown of the compressor, the absolute value of the upper limit of the second preset range is not greater than the absolute value of the lower limit of the first preset range, and the absolute value of the lower limit of the second preset range is not greater than the absolute value of the upper limit of the first preset range; Based on the re-obtained operating state of the multi-connected air conditioner reaching the second operating state and the re-obtained pressure difference parameter meeting the second preset range, controlling the compressor, the opening degree regulating valve and the exhaust temperature solenoid valve to close, and controlling to enter the preset unloading mode.

3. The multi-connected air conditioner silent unloading control method according to claim 2, characterized in that After controlling the exhaust temperature solenoid valve of the outdoor unit of the multi-connected air conditioner to open based on the pressure difference parameter meeting the first preset range, and controlling the opening degree of the opening degree regulating valve of the outdoor unit of the multi-connected air conditioner to open to the first preset value, it further includes: Obtaining the superheat degree of exhaust; According to the superheat degree of exhaust, controlling the opening and closing of the exhaust temperature solenoid valve and the opening degree regulating valve, controlling the opening degree of the opening degree regulating valve, and controlling the compressor frequency and the fan motor rotation frequency, and obtaining the corresponding operating state of the multi-connected air conditioner and the pressure difference parameter.

4. The multi-connected unit silent unloading control method according to claim 3, characterized in that According to the superheat degree of exhaust, controlling the opening and closing of the exhaust temperature solenoid valve and the opening degree regulating valve, controlling the opening degree of the opening degree regulating valve, and controlling the compressor frequency and the fan motor rotation frequency, and obtaining the corresponding operating state of the multi-connected air conditioner and the pressure difference parameter, including: Adjust the compressor frequency to be consistent with the compressor frequency when controlling the entry into the silent unloading mode, and adjust the fan motor speed to be consistent with the fan motor speed when controlling the entry into the silent unloading mode; Determine whether the exhaust superheat degree is greater than the first superheat degree threshold; If the exhaust superheat degree is greater than the first superheat degree threshold, obtain the corresponding multi-connected unit operation state and pressure difference parameter; Otherwise, control the exhaust temperature solenoid valve and the opening degree regulating valve to close, and re-obtain the exhaust superheat degree until the re-obtained exhaust superheat degree is greater than the second superheat degree threshold. Then, re-control the exhaust temperature solenoid valve of the multi-connected unit outdoor unit to open, and re-control the opening degree of the opening degree regulating valve of the multi-connected unit outdoor unit to open to the first preset value, and obtain the corresponding multi-connected unit operation state and pressure difference parameter; wherein, the second superheat degree threshold is greater than the first superheat degree threshold.

5. The multi-connected unit silent unloading control method according to claim 3 or 4, characterized in that Obtaining the exhaust superheat degree includes: Based on the pressure sensor and temperature sensor provided on the exhaust pipe between the compressor and the four-way valve, respectively obtain the exhaust pressure and the actual exhaust temperature; According to the exhaust pressure, obtain the corresponding saturation temperature according to the refrigerant thermodynamic property chart; According to the actual exhaust temperature and the saturation temperature, obtain the exhaust superheat degree.

6. The multi-connected air conditioner silent unloading control method according to claim 3, wherein Determining whether the re-obtained multi-connected unit operation state reaches the second operation state and determining whether the re-obtained pressure difference parameter meets the second preset range further includes: Based on the fact that the re-obtained multi-connected unit operation state does not reach the second operation state or the re-obtained pressure difference parameter does not meet the second preset range, re-obtain the exhaust superheat degree, and according to the re-obtained exhaust superheat degree, control the opening and closing of the exhaust temperature solenoid valve and the opening degree regulating valve, control the opening degree of the opening degree regulating valve, and control the compressor frequency and the fan motor speed until the corresponding multi-connected unit operation state reaches the second operation state and the corresponding pressure difference parameter meets the second preset range.

7. The multi-connected unit silent unloading control method according to any one of claims 1-6, characterized in that Determining whether the pressure difference parameter meets the first preset range further includes: Based on the fact that the pressure difference parameter does not meet the first preset range, control the compressor to shut down and control the entry into the preset unloading mode.

8. A multi-connected unit silent unloading control device, characterized in that, Includes: A data acquisition module that acquires the multi-connected unit operation state and the pressure difference parameter; wherein, the pressure difference parameter is obtained based on the multi-connected unit high-pressure pipeline pressure point parameter and the low-pressure pipeline pressure point parameter under the multi-connected unit operation state; A state judgment module that determines whether the pressure difference parameter meets the first preset range based on the fact that the multi-connected unit operation state reaches the first operation state; wherein, the first operation state is used to represent the state of the multi-connected unit when it operates according to the preset control program to the moment when the compressor can be shut down during the shutdown residual stage; The unloading control module controls to enter the silent unloading mode based on the pressure difference parameter conforming to the first preset range. The silent unloading mode is based on controlling the opening degree regulating valve and the exhaust temperature solenoid control valve of the multi-connected unit, so that the corresponding operating state of the multi-connected unit and the pressure difference parameter reach the target conditions, so as to control to enter the preset unloading mode. The preset unloading mode refers to controlling the unloading by opening the solenoid valve provided on the connecting pipe between the high-pressure gas pipe and the low-pressure gas pipe.

9. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, the steps of the multi-connected unit silent unloading control method according to any one of claims 1 to 7 are implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the multi-connected unit silent unloading control method according to any one of claims 1 to 7 are implemented.

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