Refrigerant system and control method and control device thereof

Abstract

The invention provides a refrigerant system and a control method and device thereof. The refrigerant system comprises a compressor, an exhaust port and an air suction port of the compressor are connected with a first refrigerant pipeline and a second refrigerant pipeline respectively, a high-low pressure balance pipeline is connected between the first refrigerant pipeline and the second refrigerant pipeline, and a bypass valve and a bypass expansion valve are arranged on the high-low pressure balance pipeline; a detection device; the control device is connected with the detection device, and the acquisition module is used for acquiring the environment temperature information and the operation parameter information; the control module is used for controlling opening and closing of the bypass valve and adjusting the opening degree of the bypass expansion valve according to the environment temperature information and the operation parameter information. The bypass expansion valve with the adjustable opening degree is arranged on the high-low pressure balance pipeline, the opening degree of the electronic expansion valve is controlled according to the environment temperature information and the operation parameter information of the compressor, and the refrigerant bypass flow is adjusted, so that the exhaust pressure is accurately unloaded, the suction pressure and the suction superheat degree are increased, and the reliability of the unit under the limiting working condition is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and particularly to a refrigerant system, its control method and control device. Background Art

[0002] In related technologies, for the problem that existing machines maintain the balance of high and low pressures under extremely harsh conditions, the suction and exhaust bypasses of the unit are controlled by an electromagnetic valve switch according to the low-pressure value and ambient temperature, and the refrigerant flow rates of suction and exhaust cannot be adjusted according to actual conditions, often resulting in excessive refrigerant spraying from the exhaust to the suction, causing attenuation of the unit's capacity and abnormal fluctuations in the system.

[0003] In addition, the bypass pipeline in the machines in related technologies can only be normally open or normally closed, and the refrigerant bypass amount cannot be accurately adjusted, which will cause the electromagnetic valve to frequently actuate and switch, resulting in system fluctuations. Moreover, existing machines cannot control the refrigerant flow according to the high and low pressures and the suction superheat, which may cause excessive bypass refrigerant, resulting in a decrease in the unit's capacity, ineffective superheat at the suction end, an increase in the compressor power, and a decrease in the unit's energy efficiency. Summary of the Invention

[0004] The present invention provides a refrigerant system, its control method and control device to solve the defects existing in the prior art and achieve the following technical effects: by providing a bypass expansion valve with adjustable opening on the high and low pressure balance pipeline, and controlling the opening of the electronic expansion valve according to the ambient temperature information and the operating parameter information of the compressor, the refrigerant bypass flow is adjusted, thereby accurately unloading the exhaust pressure, increasing the suction pressure and the suction superheat, and improving the reliability of the unit under extreme conditions.

[0005] The refrigerant system according to the first aspect embodiment of the present invention includes: A compressor, the exhaust port and the suction port of the compressor are respectively connected with a first refrigerant pipeline and a second refrigerant pipeline, a high and low pressure balance pipeline is connected between the first refrigerant pipeline and the second refrigerant pipeline, and a bypass valve and a bypass expansion valve are provided on the high and low pressure balance pipeline; A detection device for detecting the ambient temperature information and the operating parameter information of the compressor; A control device, connected to the detection device, includes an acquisition module and a control module, the acquisition module is used to acquire the ambient temperature information and the operating parameter information; the control module is used to control the opening and closing of the bypass valve and adjust the opening of the bypass expansion valve according to the ambient temperature information and the operating parameter information.

[0006] According to an embodiment of the present invention, the control module includes a first control module, a second control module and a third control module; The first control module is configured to determine the set opening conditions of the bypass valve and the bypass expansion valve according to the current operating mode of the refrigerant system; The second control module is configured to control the bypass valve and the bypass expansion valve to open and last for at least a first set duration if the ambient temperature information and the operating parameter information meet the set opening conditions; The third control module is configured to adjust the opening degree of the bypass expansion valve according to the operating parameter information after the first set duration.

[0007] In this way, through the collaborative work of these three control modules, the present invention can achieve precise control of the pressure balance of the refrigerant system, avoiding problems such as inaccurate refrigerant flow regulation, system fluctuations, and reduced energy efficiency existing in traditional solenoid valve control.

[0008] According to an embodiment of the present invention, the first control module is specifically configured to: When the refrigerant system is in the refrigeration mode, determine that the set opening conditions are: the ambient temperature is greater than or equal to a first set ambient temperature, and the high-pressure of the compressor is greater than or equal to a first set high-pressure.

[0009] In the embodiment of the present invention, the function of the first control module is to determine the opening conditions of the bypass valve and the bypass expansion valve according to the current operating mode of the refrigerant system.

[0010] According to an embodiment of the present invention, the third control module is specifically configured to: After the first set duration; If the high-pressure of the compressor is greater than or equal to the first set high-pressure, control the opening degree of the bypass expansion valve to open at a first rate.

[0011] Or, if the high-pressure of the compressor is less than the first set high-pressure and greater than a second set high-pressure, control the opening degree of the bypass expansion valve to remain unchanged; Or, if the high-pressure of the compressor is less than or equal to the second set high-pressure, control the opening degree of the bypass expansion valve to close at a second rate.

[0012] In this way, through this method of dynamically adjusting the opening degree of the bypass expansion valve based on the high-pressure, the present invention can effectively maintain the pressure balance of the refrigerant system in the refrigeration mode, avoiding system performance degradation and instability caused by abnormal high or low pressure, and at the same time improving the overall operating efficiency and reliability.

[0013] According to an embodiment of the present invention, the first control module is specifically configured to: When the refrigerant system is in the heating mode, the set opening conditions include at least one of a first condition, a second condition, and a third condition; The first condition includes: the ambient temperature is less than or equal to a second set ambient temperature, and the low-pressure of the compressor is less than a first set low-pressure; The second condition includes: the ambient temperature is less than or equal to a second set ambient temperature, and the high-pressure of the compressor is greater than a third set high-pressure and lasts for at least a second set duration; The third condition includes: the ambient temperature is less than or equal to a second set ambient temperature, and the suction superheat of the compressor is less than zero and lasts for at least a third set duration.

[0014] In an embodiment of the present invention for the heating mode, the first control module is used to determine the opening conditions for starting the bypass control. These conditions are based on the ambient temperature, the low-pressure and high-pressure of the compressor, and the suction superheat to ensure the stable operation of the system and maintain the necessary pressure balance in the heating mode.

[0015] According to an embodiment of the present invention, the third control module is specifically configured to: After the first set duration; If the low-pressure is less than or equal to the first set low-pressure, the high-pressure is greater than the third set high-pressure, and / or the suction superheat is less than the first set superheat, then control the opening of the bypass expansion valve to increase at a first rate; Or, if the low-pressure is less than the first set low-pressure and greater than the second set low-pressure, the high-pressure is less than or equal to the third set high-pressure and greater than the fourth set high-pressure, and / or the suction superheat is greater than the first set superheat and less than or equal to the second set superheat, then control the opening of the bypass expansion valve to remain unchanged; Or, if the low-pressure is greater than the second set low-pressure, the high-pressure is less than or equal to the difference between the third set high-pressure and a first pressure value, and / or the suction superheat is greater than the second set superheat, then control the opening of the bypass expansion valve to decrease at a second rate; Wherein, in the third control module, the priority of the above opening adjustment operations is arranged from largest to smallest as follows: controlling the opening of the bypass expansion valve to increase at a first rate, controlling the opening of the bypass expansion valve to remain unchanged, and controlling the opening of the bypass expansion valve to decrease at a second rate.

[0016] In this way, through this strategy of dynamically adjusting the opening of the bypass expansion valve, the present invention can effectively maintain the pressure balance of the refrigerant system in the heating mode, avoid the decline and instability of the system performance caused by improper refrigerant bypass, and improve the operation efficiency and reliability of the system.

[0017] According to an embodiment of the present invention, the control module further includes a fourth control module, and the fourth control module is configured to: Determine the set closing conditions of the bypass valve and the bypass expansion valve according to the current working mode of the refrigerant system, and control the bypass valve and the bypass expansion valve to close when the refrigerant system meets the set closing conditions.

[0018] In this way, the introduction of this module further improves the automatic control of the system, ensuring that in various working modes, the system can not only respond to the pressure balance demand in a timely manner, but also quickly close the bypass when the conditions return to normal, avoiding unnecessary energy consumption and system fluctuations.

[0019] According to an embodiment of the present invention, the fourth control module is specifically configured to: When it is determined that the high-pressure pressure of the compressor in the refrigerant system is less than the difference between the second set high-pressure pressure and the second pressure value, and the bypass expansion valve maintains the minimum opening for at least the fourth set duration according to the fact that the refrigerant system is currently in the refrigeration mode, control the bypass valve and the bypass expansion valve to close; Or, when it is determined that the refrigerant system is currently in the heating mode, the low-pressure pressure of the compressor in the refrigerant system is greater than the sum value of the second set low-pressure pressure and the third pressure value, the high-pressure pressure is less than or equal to the difference between the third set high-pressure pressure and the first pressure value, the superheat degree is greater than the second set superheat degree, and the bypass expansion valve maintains the minimum opening for at least the fourth set duration, control the bypass valve and the bypass expansion valve to close.

[0020] In this way, through the above method, the present invention can achieve precise control of the pressure balance of the refrigerant system in the refrigeration mode, and at the same time ensure that the bypass control can respond quickly when necessary and exit in a timely manner when the conditions permit, so as to achieve the best system performance and energy management effect.

[0021] In addition, through the finely set closing conditions, the present invention can achieve precise control of the pressure balance of the refrigerant system in the heating mode, ensure that the bypass control can be enabled when necessary and exit in a timely manner when the conditions are suitable, so as to achieve the best system performance and energy management effect.

[0022] For the control method of the refrigerant system according to the second aspect embodiment of the present invention, a high-low pressure balance pipeline is connected between the exhaust port and the suction port of the compressor of the refrigerant system, and a bypass valve and a bypass expansion valve are provided on the high-low pressure balance pipeline; the control method includes: Obtain the ambient temperature information and the operation parameter information of the compressor; Control the opening and closing of the bypass valve and adjust the opening degree of the bypass expansion valve according to the environmental temperature information and the operating parameter information.

[0023] For the control device of the refrigerant system according to the third aspect embodiment of the present invention, a high-low pressure balance pipeline is connected between the exhaust port and the suction port of the compressor of the refrigerant system, and a bypass valve and a bypass expansion valve are provided on the high-low pressure balance pipeline; the control device includes: An acquisition module, configured to acquire the environmental temperature information and the operating parameter information of the compressor; A control module, configured to control the opening and closing of the bypass valve and adjust the opening degree of the bypass expansion valve according to the environmental temperature information and the operating parameter information.

[0024] The present invention provides a refrigerant system. By providing a bypass expansion valve with adjustable opening degree on the high-low pressure balance pipeline, and controlling the opening degree of the electronic expansion valve according to the environmental temperature information and the operating parameter information of the compressor, the bypass flow of the refrigerant is adjusted, so as to accurately unload the exhaust pressure, increase the suction pressure and the suction superheat degree, and improve the reliability of the unit under extreme conditions.

[0025] Furthermore, the refrigerant system of the present invention has at least the following advantages compared with the related art.

[0026] (1) Accurately adjust the refrigerant flow: By introducing an electronic expansion valve (EXV1), the system can accurately control the bypass amount of the refrigerant according to the actual working conditions, such as the suction pressure, the exhaust pressure, the environmental temperature and the return gas temperature, avoiding the limitation that the traditional solenoid valve can only be fully opened or fully closed, and reducing the system fluctuation.

[0027] (2) Improve the system reliability: Under extreme conditions, the electronic expansion valve can stably adjust the bypass flow of the refrigerant, avoiding the overloading operation of the compressor caused by excessive refrigerant bypass, and improving the operating range and reliability of the unit.

[0028] (3) Optimize the energy efficiency: The accurate control of the refrigerant flow reduces the ineffective superheat phenomenon, reduces the additional power consumption of the compressor, and thus improves the overall energy efficiency of the unit.

[0029] (4) Reduce the system fluctuation: The introduction of the electronic expansion valve reduces the frequent switching of the solenoid valve, reduces the fluctuation caused by the switching operation of the system, and improves the operation stability.

[0030] (5) Adapt to complex working conditions: Whether in the refrigeration or heating mode, the control logic of the present invention can be flexibly adjusted according to different operating parameters, so that the system can maintain high efficiency and stability under various working conditions.

[0031] (6) Solving special problems: Especially for the startup problem under low ambient temperature, the present invention can effectively control the refrigerant bypass, avoid common problems such as severe liquid return and unqualified oil temperature, and improve the startup performance of the unit under low temperature environment.

[0032] In summary, the present invention achieves precise control of refrigerant flow by adding an electronic expansion valve to the high and low pressure balance pipelines and linking it with multiple sensors, thereby solving the problem of inaccurate refrigerant flow regulation in the prior art and significantly improving the performance and reliability of the system under extreme conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a partial structural schematic diagram of the refrigerant system provided by the present invention.

[0035] Figure 2 It is a structural schematic diagram of a control device and a detection device of a refrigerant system provided by the present invention.

[0036] Figure 3 It is a flow chart of the control method of the refrigerant system provided by the present invention.

[0037] Figure 4 It is a structural schematic diagram of the control device of the refrigerant system provided by the present invention.

[0038] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention. Description of the drawings: 1. Compressor; 2. First refrigerant pipeline; 3. Second refrigerant pipeline; 4. High and low pressure balance pipeline; 5. Bypass valve; 6. Bypass expansion valve; 7. Four-way valve; 10. Detection device; 20. Control device; 11. First control module; 12. Second control module; 13. Third control module; 14. Fourth control module; 110. Acquisition module; 120. Control module. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0041] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0042] A refrigerant system, a control method for the refrigerant system, and a control device thereof given by the present invention will be described below with reference to the drawings.

[0043] As Figure 1 and 2 shown, the refrigerant system according to the first aspect embodiment of the present invention includes a compressor 1, a detection device 10, and a control device 20.

[0044] A first refrigerant pipeline 2 and a second refrigerant pipeline 3 are respectively connected to the exhaust port and the suction port of the compressor 1. A high-low pressure balance pipeline 4 is connected between the first refrigerant pipeline 2 and the second refrigerant pipeline 3. A bypass valve 5 and a bypass expansion valve 6 are provided on the high-low pressure balance pipeline 4.

[0045] The detection device 10 is used to detect the ambient temperature information and the operating parameter information of the compressor 1. The control device 20 is connected to the detection device 10 and includes an acquisition module 110 and a control module 120. The acquisition module 110 is used to acquire the ambient temperature information and the operating parameter information; the control module 120 is used to control the opening and closing of the bypass valve 5 and adjust the opening degree of the bypass expansion valve 6 according to the ambient temperature information and the operating parameter information.

[0046] It should be noted that in the refrigerant system of the present invention, the advantages of this system compared to ordinary refrigerant systems are as follows: A bypass valve 5 and a bypass expansion valve 6 are installed on the high-low pressure balance pipeline 4. Among them, the high-low pressure balance pipeline 4 is a pipeline connecting the exhaust port (high pressure side) and the suction port (low pressure side) of the compressor 1. Its main function is to allow the refrigerant to flow from the high pressure side to the low pressure side when the system requires it, so as to balance the system pressure and avoid damage to system components caused by excessive or too low pressure, especially under extreme operating conditions.

[0047] The bypass valve 5 is usually an electromagnetic valve, which is used to open or close the flow path of the refrigerant in the high-low pressure balance pipeline 4. When the system needs to balance the pressure or unload, the bypass valve 5 will be activated to allow the refrigerant to flow between the high pressure area and the low pressure area. The on-off state of the bypass valve 5 depends on the instructions of the control system, and these instructions are based on system operating parameters and environmental conditions.

[0048] The bypass expansion valve 6 is a precision valve that can adjust its opening according to instructions to control the refrigerant flow rate passing through it. In the refrigerant system, the bypass expansion valve 6 is used to adjust the refrigerant flow rate from the high pressure area to the low pressure area, which is crucial for maintaining the system pressure balance. Compared with traditional solenoid valves, the bypass expansion valve 6 can provide more precise flow control, avoiding the impact on the system caused by sudden changes in refrigerant flow rate, thereby improving the stability and efficiency of the system.

[0049] Furthermore, for the refrigerant system according to the embodiment of the present invention, its specific working principle and process are as follows: During the operation of the refrigerant system, the compressor 1 generates high-pressure and high-temperature refrigerant vapor, while the evaporator generates low-pressure and low-temperature refrigerant vapor. To ensure the stable operation of the system under various environmental conditions, the detection device 10 in the system will continuously monitor environmental temperature information and the operating parameters of the compressor 1, such as high pressure, low pressure, suction temperature, exhaust temperature, etc.

[0050] When it is detected that the system needs to balance the pressure, for example, under extreme weather conditions or when the system load changes greatly, the control device 20 will make a decision based on the detected information. If the high pressure is too high or the low pressure is too low, the control device 20 will activate the bypass valve 5 to open the high-low pressure balance pipeline 4, and at the same time adjust the opening of the bypass expansion valve 6 to control the appropriate refrigerant flow rate, so as to achieve the purpose of pressure balance. This process is dynamic, and as the system conditions change, the opening of the bypass expansion valve 6 will be adjusted accordingly to maintain the best system performance.

[0051] The control process usually follows a set of preset logic. For example, in cooling mode, when the high pressure reaches a certain threshold, the system will start bypass control; in heating mode, the control logic may be based on parameters such as low pressure or suction superheat. The goal of the system is to maintain efficient, stable and reliable operation under various operating conditions while avoiding unnecessary energy waste.

[0052] In the related technology, in order to maintain the balance of high and low pressures under extremely harsh conditions, the existing machines control the bypass of the unit's intake and exhaust through the solenoid valve switch according to the low pressure value and ambient temperature. The refrigerant flow of the intake and exhaust gases cannot be adjusted according to the actual situation, which often causes excessive refrigerant spraying from the exhaust to the intake, resulting in a decrease in the unit's capacity and abnormal fluctuations in the system.

[0053] In addition, the bypass pipe in the machine in the related art can only be opened or closed, and the bypass volume of the refrigerant cannot be accurately adjusted, which will cause the solenoid valve to frequently switch on and off, causing system fluctuations. In addition, the existing machine cannot control the refrigerant flow according to the high and low pressures and the suction superheat, which may cause too much bypass refrigerant, resulting in reduced unit capacity, ineffective overheating at the suction end, increased compressor power, and reduced unit energy efficiency.

[0054] Therefore, in order to solve the technical defects existing in the above-mentioned related technologies, the present invention provides a refrigerant system, which provides a bypass expansion valve 6 with adjustable opening on the high and low pressure balance pipe 4, and controls the opening of the electronic expansion valve according to the ambient temperature information and the operating parameter information of the compressor 1, and adjusts the refrigerant bypass flow, so as to accurately unload the exhaust pressure, increase the suction pressure and suction superheat, and improve the reliability of the unit under extreme working conditions.

[0055] Furthermore, the refrigerant system of the present invention has at least the following advantages compared to the related art.

[0056] (1) Accurately adjust the refrigerant flow rate: By introducing the electronic expansion valve (EXV1), the system can accurately control the bypass volume of the refrigerant according to the actual working conditions, such as suction pressure, exhaust pressure, ambient temperature and return air temperature, avoiding the limitation of traditional solenoid valves that can only be fully open or fully closed, and reducing system fluctuations.

[0057] (2) Improve system reliability: Under extreme operating conditions, the electronic expansion valve can stably adjust the refrigerant bypass flow, avoiding overload operation of compressor 1 due to excessive refrigerant bypass, and improving the operating range and reliability of the unit.

[0058] (3) Optimizing energy efficiency: Accurate refrigerant flow control reduces ineffective overheating and reduces the additional power consumption of compressor 1, thereby improving the overall energy efficiency of the unit.

[0059] (4) Reduce system fluctuations: The introduction of the electronic expansion valve reduces the frequent switching of the solenoid valve, reduces the fluctuations in the system caused by switching operations, and improves operational stability.

[0060] (5) Adaptability to complex working conditions: Whether in cooling or heating mode, the control logic of the present invention can be flexibly adjusted according to different operating parameters, so that the system can maintain high efficiency and stability under various working conditions.

[0061] (6) Solving special problems: Especially for the startup problem under low ambient temperature, the present invention can effectively control the refrigerant bypass, avoid common problems such as severe liquid return and unqualified oil temperature, and improve the startup performance of the unit under low temperature environment.

[0062] In summary, the present invention achieves precise control of refrigerant flow by adding an electronic expansion valve to the high and low pressure balance pipelines and linking it with multiple sensors, thereby solving the problem of inaccurate refrigerant flow regulation in the prior art and significantly improving the performance and reliability of the system under extreme conditions.

[0063] According to some embodiments of the present invention, the detection device 10 may include a high-pressure sensor, a low-pressure sensor, an exhaust temperature sensor, an intake temperature sensor, and an ambient temperature sensor. Correspondingly, the ambient temperature information may include the specific magnitude of the ambient temperature, and the operating parameter information of the compressor 1 may include the magnitude of the low-pressure pressure, the magnitude of the high-pressure pressure, the magnitude of the exhaust temperature, the magnitude of the intake temperature, the magnitude of the intake superheat, and other parameters of the compressor 1.

[0064] It needs to be explained that the introduction of the above-mentioned sensors is as follows.

[0065] High pressure sensor (Pd): measures the refrigerant pressure on the exhaust side of compressor 1. High pressure is an important indicator for evaluating whether the system needs to unload pressure. When the high pressure exceeds the set value, the bypass expansion valve 6 (EXV1) will begin to adjust the opening to allow the refrigerant to flow from the high pressure side to the low pressure side, thereby reducing the high pressure.

[0066] Low pressure sensor (Ps): Measures the refrigerant pressure on the suction side of compressor 1. The low pressure reflects the operation of the evaporator. If the low pressure is too low, it may indicate that the system needs to increase the refrigerant flow to improve the efficiency of the evaporator.

[0067] Exhaust temperature sensor (Td): monitors the temperature of the refrigerant discharged from compressor 1. Exhaust temperature is crucial to determine whether compressor 1 is overheated. Excessively high exhaust temperature may cause damage to compressor 1.

[0068] Suction Temperature Sensor (Ts): Detects the refrigerant temperature on the suction side of the compressor 1. The suction temperature is directly related to the efficiency of the compressor 1 and the system performance. A lower suction temperature helps improve the efficiency of the compressor 1.

[0069] Ambient Temperature Sensor (Tao): Measures the temperature of the external environment. The ambient temperature affects the heat exchange efficiency of the refrigerant system. Especially in the cooling or heating mode, the ambient temperature determines the operating load of the system.

[0070] Suction Superheat (DSH1): Calculated as the suction temperature (Ts) minus the suction saturation temperature. The suction superheat reflects the state of the refrigerant before entering the compressor 1. Too high or too low superheat will affect the performance and efficiency of the compressor 1.

[0071] The data collected by these sensors is sent to the control device 20. The control device 20 receives information through the acquisition module 110, and then the control module 120 determines the opening and closing of the bypass valve 5 (SV1) and the opening degree of the bypass expansion valve 6 (EXV1) based on this information. This closed-loop control strategy ensures that the system can maintain a stable high and low pressure balance under various operating conditions, avoiding problems such as system performance degradation and instability caused by excessive or insufficient refrigerant bypass.

[0072] For example, in the cooling mode, when the ambient temperature is high and the high-pressure reaches the set value, the system will start the bypass control. The bypass expansion valve 6 adjusts the opening degree according to the magnitude of the high-pressure to reduce the high-pressure at an appropriate speed until it reaches the safe range. Similarly, in the heating mode, the system dynamically adjusts the opening degree of the bypass expansion valve 6 according to parameters such as the low-pressure, high-pressure, and suction superheat to maintain the system stability.

[0073] Therefore, the present invention realizes the precise control of the pressure balance of the refrigerant system through the integration of multiple sensors and intelligent control logic, improving the operating efficiency and reliability of the system.

[0074] According to some embodiments of the present invention, the control module 120 includes a first control module 11, a second control module 12, and a third control module 13.

[0075] The first control module 11 is used to determine the set opening conditions of the bypass valve 5 and the bypass expansion valve 6 according to the current working mode of the refrigerant system; the second control module 12 is used to control the bypass valve 5 and the bypass expansion valve 6 to open and last for at least the first set duration if the ambient temperature information and the operating parameter information meet the set opening conditions; the third control module 13 is used to adjust the opening degree of the bypass expansion valve 6 according to the operating parameter information after the first set duration.

[0076] In this embodiment, the control module 120 of the present invention realizes the intelligent control of the bypass valve 5 and the bypass expansion valve 6 in the refrigerant system through three sub-modules, namely, the first control module 11, the second control module 12, and the third control module 13. These three modules cooperate together to ensure that in different operating modes, the system can timely open the bypass and adjust the refrigerant flow according to the changes in the environment and operating conditions to maintain the system pressure balance.

[0077] Specifically, the main task of the first control module 11 is to determine the opening conditions of the bypass valve 5 and the bypass expansion valve 6 based on the current operating mode (refrigeration or heating) of the refrigerant system. These conditions are usually based on a series of preset thresholds, such as ambient temperature, high-pressure, low-pressure, exhaust temperature, suction temperature, and suction superheat. For example, in the refrigeration mode, if the ambient temperature reaches or exceeds T1 and the high-pressure exceeds P1, the first control module 11 will trigger the opening condition for bypass control.

[0078] Once the ambient temperature information and the operating parameter information meet the opening conditions set by the first control module 11, the second control module 12 will be activated. It will perform the following operations: control the bypass valve 5 (SV1) and the bypass expansion valve 6 (EXV1) to open, allowing the refrigerant to flow in the high-low pressure balance pipeline 4; keep the bypass valve 5 and the bypass expansion valve 6 in the open state for at least the first set duration. Here, this first set duration is to ensure that the system can respond to the pressure change in time and start to adjust the refrigerant flow.

[0079] After the first set duration, the third control module 13 takes over the control process and dynamically adjusts the opening degree of the bypass expansion valve 6 according to the latest operating parameter information. This step is crucial because it allows the system to adjust the refrigerant flow according to real-time parameters such as high-pressure, low-pressure, and suction superheat to achieve the best pressure balance state. For example, in the refrigeration mode, if the high-pressure is still higher than P1, the third control module 13 will instruct the bypass expansion valve 6 to open further according to the rate S1 until the pressure drops to the target range.

[0080] In this way, through the coordinated work of these three control modules 120, the present invention can achieve precise control of the pressure balance of the refrigerant system, avoiding problems such as inaccurate refrigerant flow regulation, system fluctuations, and reduced energy efficiency existing in traditional solenoid valve control. In addition, this intelligent control strategy can also improve the reliability and operating efficiency of the system, especially under extreme environmental conditions.

[0081] In some embodiments of the present invention, the first control module 11 is specifically configured to: in the case where the refrigerant system is in the refrigeration mode, determine that the set opening condition is: the ambient temperature is greater than or equal to the first set ambient temperature, and the high-pressure of the compressor 1 is greater than or equal to the first set high-pressure.

[0082] In an embodiment of the present invention, the first control module 11 is configured to determine the opening conditions of the bypass valve 5 and the bypass expansion valve 6 according to the current operating mode of the refrigerant system. In the refrigeration mode, the opening conditions of the first control module 11 are set as follows: the ambient temperature (Tao) must be greater than or equal to the first set ambient temperature (T1); the high-pressure pressure (Pd) of the compressor 1 must be greater than or equal to the first set high-pressure pressure (P1).

[0083] When these two conditions are simultaneously satisfied, the first control module 11 will consider that the system needs to start bypass control to balance the high and low pressures and avoid a decline in system performance or damage that may be caused by excessive high-pressure pressure.

[0084] In the refrigeration mode, the increase in high-pressure pressure may be due to the rise in the external ambient temperature, resulting in a decrease in the heat dissipation efficiency of the condenser, thereby increasing the refrigerant pressure discharged by the compressor 1. At this time, if the high-pressure pressure exceeds the upper limit within the safe or efficient range (i.e., the first set high-pressure pressure P1), a bypass mechanism is required to reduce the high-pressure pressure and prevent system overload.

[0085] Similarly, if the ambient temperature (Tao) reaches or exceeds the first set ambient temperature (T1), this indicates that external conditions may impose an additional heat load on the system, and bypass control is required to regulate the refrigerant flow rate to ensure that the system can effectively cope with this heat load and maintain a normal operating state.

[0086] Once these conditions are met, the first control module 11 will trigger the opening of the bypass valve 5 (SV1) and the bypass expansion valve 6 (EXV1), allowing the refrigerant to flow from the high-pressure area to the low-pressure area, thereby achieving pressure balance. Subsequently, the second control module 12 will ensure that the bypass valve 5 and the bypass expansion valve 6 remain open for at least a set period of time so that the system can respond to pressure changes in a timely manner. Finally, the third control module 13 will adjust the opening degree of the bypass expansion valve 6 according to the real-time changes in the operating parameters to precisely control the refrigerant flow rate and ensure that the system operates in an optimal state.

[0087] In some specific embodiments, the third control module 13 is specifically configured to: After the first set duration; if the high-pressure pressure of the compressor 1 is greater than or equal to the first set high-pressure pressure, control the opening degree of the bypass expansion valve 6 to increase at a first rate.

[0088] Alternatively, if the high-pressure pressure of the compressor 1 is less than the first set high-pressure pressure and greater than the second set high-pressure pressure, control the opening degree of the bypass expansion valve 6 to remain unchanged.

[0089] Alternatively, if the high-pressure pressure of the compressor 1 is less than or equal to the second set high-pressure pressure, control the opening degree of the bypass expansion valve 6 to decrease at a second rate.

[0090] In a specific embodiment of the present invention, the function of the third control module 13 is to dynamically adjust the opening degree of the bypass expansion valve 6 (EXV1) to ensure that the refrigerant system can maintain an appropriate high and low pressure balance in the refrigeration mode. Specifically, the logic of the third control module 13 is as follows.

[0091] The third control module 13 continuously monitors the high-pressure pressure (Pd) of the compressor 1.

[0092] If the high-pressure pressure (Pd) is greater than or equal to the first set high-pressure pressure (P1), this indicates that the pressure on the high-pressure side is too high, and it is necessary to release the pressure by increasing the opening degree of the bypass expansion valve 6 (EXV1). Therefore, the third control module 13 controls the bypass expansion valve 6 to open at the first rate (S1) to accelerate the flow of refrigerant from the high-pressure area to the low-pressure area, thereby reducing the high-pressure pressure.

[0093] If the high-pressure pressure (Pd) is less than the first set high-pressure pressure (P1) but greater than the second set high-pressure pressure (P2), this means that the high-pressure pressure has approached or is in the ideal range, and there is no need to further increase the bypass flow rate. In this case, the third control module 13 keeps the opening degree of the bypass expansion valve 6 (EXV1) unchanged to maintain the current refrigerant flow rate and pressure balance.

[0094] If the high-pressure pressure (Pd) is less than or equal to the second set high-pressure pressure (P2), this indicates that the high-pressure pressure may be too low, and it is necessary to reduce the bypass flow rate to prevent the pressure from further decreasing. Thus, the third control module 13 controls the bypass expansion valve 6 to close at the second rate (S2) to reduce the bypass amount of refrigerant, thereby helping to increase the high-pressure pressure.

[0095] In this way, by this method of dynamically adjusting the opening degree of the bypass expansion valve 6 based on the high-pressure pressure, the present invention can effectively maintain the pressure balance of the refrigerant system in the refrigeration mode, avoid the decline and instability of the system performance caused by abnormal high or low pressure, and at the same time improve the overall operation efficiency and reliability.

[0096] In some other embodiments of the present invention, the first control module 11 is specifically used for: when the refrigerant system is in the heating mode, setting the opening conditions to include at least one of the first condition, the second condition, and the third condition.

[0097] In the embodiment of the present invention for the heating mode, the first control module 11 is used to determine the opening conditions for starting the bypass control. These conditions are based on the ambient temperature, the low-pressure pressure, the high-pressure pressure, and the suction superheat degree of the compressor 1 to ensure that the system can operate stably and maintain the necessary pressure balance in the heating mode. The specific conditions are as follows.

[0098] The first condition: The ambient temperature (Tao) is less than or equal to the second set ambient temperature (T2), and at the same time, the low-pressure of compressor 1 (Ps) is less than the first set low-pressure (P3). This condition indicates that in a low-temperature environment, the pressure on the low-pressure side of the system is too low, which may affect the normal heating capacity of the system. At this time, starting the bypass control can increase the refrigerant flow rate on the low-pressure side and improve the system performance.

[0099] The second condition: The ambient temperature (Tao) is less than or equal to the second set ambient temperature (T2), and the high-pressure of compressor 1 (Pd) is greater than the third set high-pressure (P5) and lasts for at least the second set duration (for example, it can be 1 minute). This means that under low-temperature conditions, the pressure on the high-pressure side is abnormally high, and the long-term high-pressure state may damage the system. By starting the bypass control, the pressure on the high-pressure side can be relieved to protect the system.

[0100] The third condition: The ambient temperature (Tao) is less than or equal to the second set ambient temperature (T2), and the suction superheat of compressor 1 (DSH1) is less than zero and lasts for at least the third set duration (for example, it can be 3 minutes). This situation means that in a low-temperature environment, there is a risk of liquid refrigerant entering compressor 1, which may cause the so-called "liquid compression" phenomenon and damage compressor 1. Starting the bypass control can help improve this situation, ensure that the refrigerant inhaled by compressor 1 is mainly gaseous, and avoid liquid hammer.

[0101] When one of the above conditions is met, the first control module 11 will trigger the opening of the bypass valve 5 (SV1), and at the same time, the bypass expansion valve 6 (EXV1) will be opened to the initial opening and maintained for a period of time. Subsequently, according to the changes in the low-pressure (Ps), high-pressure (Pd), and suction superheat (DSH1) of compressor 1, the third control module 13 will dynamically adjust the opening of the bypass expansion valve 6 to maintain the pressure balance of the system in the heating mode, avoid abnormal fluctuations in the system, and improve the operating efficiency and reliability of the unit.

[0102] Furthermore, in some specific embodiments, the third control module 13 is specifically configured to: after the first set duration; if the low-pressure is less than or equal to the first set low-pressure, the high-pressure is greater than the third set high-pressure, and / or the suction superheat is less than the first set superheat (for example, it can be 2°C), then control the opening of the bypass expansion valve 6 to increase at the first rate.

[0103] It can be understood that when the parameters in the refrigerant system meet the above conditions, this indicates that the system needs to increase the refrigerant bypass amount to balance the pressure or increase the suction superheat to prevent compressor 1 from inhaling too much liquid refrigerant. At this time, the third control module 13 will control the bypass expansion valve 6 to open at the first rate (S1).

[0104] Alternatively, the third control module 13 is specifically configured to: after a first set duration; when the low-pressure is less than a first set low-pressure and greater than a second set low-pressure, the high-pressure is less than or equal to a third set high-pressure and greater than a fourth set high-pressure, and / or the suction superheat is greater than a first set superheat and less than or equal to a second set superheat, control the opening degree of the bypass expansion valve 6 to remain unchanged.

[0105] It can be understood that when the parameters in the refrigerant system meet the above conditions, it indicates that the system is in a relatively stable operating state. At this time, the opening degree of the bypass expansion valve 6 should remain unchanged to maintain the current refrigerant flow rate and system pressure balance.

[0106] Alternatively, the third control module 13 is specifically configured to: after a first set duration; when the low-pressure is greater than a second set low-pressure, the high-pressure is less than or equal to the difference between a third set high-pressure and a first pressure value (which can be 0.3 MPa, for example), and / or the suction superheat is greater than a second set superheat, control the opening degree of the bypass expansion valve 6 to close at a second rate.

[0107] It can be understood that when the parameters in the refrigerant system meet the above conditions, it indicates that there is too much refrigerant bypass in the system, and it is necessary to reduce it to avoid suction overheating or too low high-side pressure. At this time, the third control module 13 will control the bypass expansion valve 6 to close at a second rate (S2).

[0108] Among them, in the third control module 13, the priority of the above opening degree adjustment operations is arranged from largest to smallest as follows: controlling the opening degree of the bypass expansion valve 6 to open at a first rate, controlling the opening degree of the bypass expansion valve 6 to remain unchanged, and controlling the opening degree of the bypass expansion valve 6 to close at a second rate.

[0109] That is to say, the priority of the above bypass expansion valve 6 opening degree operations is in turn: open > maintain > close, which means that when multiple conditions are met simultaneously, the system will give priority to opening the bypass expansion valve 6, followed by maintaining the current opening degree, and finally closing the bypass expansion valve 6.

[0110] In this way, through this strategy of dynamically adjusting the opening degree of the bypass expansion valve 6, the present invention can effectively maintain the pressure balance of the refrigerant system in the heating mode, avoid the decline and instability of the system performance caused by improper refrigerant bypass, and improve the operating efficiency and reliability of the system.

[0111] It should be explained that in the refrigerant system, the setting of the priority is crucial for ensuring the stable operation, efficiency and safety of the system. The reasons for setting the priority in the control logic of the bypass expansion valve 6 (EXV1) in the heating mode are introduced as follows.

[0112] Opening the bypass expansion valve 6 has the highest priority. This is because when the system detects that the low-pressure is too low, the high-pressure is too high, or the suction superheat is too small, it indicates that the system may be in an unstable or dangerous state. Increasing the opening of the bypass expansion valve 6 can quickly adjust the refrigerant flow rate, reduce the high-pressure, increase the low-pressure and the suction superheat, thereby preventing the system from overloading or damaging the compressor 1.

[0113] Maintaining the opening of the bypass expansion valve 6 unchanged has the second-highest priority, which is applicable when the system is in a relatively stable state. By maintaining the current refrigerant flow rate, unnecessary system fluctuations can be avoided, the smooth operation of the system can be maintained, and energy waste can be avoided at the same time.

[0114] Closing the bypass expansion valve 6 has the lowest priority. This is because when the system detects that excessive refrigerant bypass is not required, reducing the opening of the bypass expansion valve 6 can optimize the system efficiency, avoid ineffective superheat of the suction caused by excessive bypass, reduce the power consumption of the compressor 1, and improve the overall energy efficiency ratio of the system.

[0115] In summary, setting such a priority logic can ensure that the system can respond quickly in case of emergency, prevent potential damage; when the system is stable, avoid unnecessary adjustments and maintain system efficiency; and in non-emergency but optimized situations, gradually adjust the opening of the bypass expansion valve 6 to achieve the best system performance. This hierarchical control strategy reflects the comprehensive consideration of safety, stability, and efficiency in system design.

[0116] According to some embodiments of the present invention, the control module 120 further includes a fourth control module 14, and the fourth control module 14 is configured to: determine the set closing conditions of the bypass valve 5 and the bypass expansion valve 6 according to the current working mode of the refrigerant system, and control the bypass valve 5 and the bypass expansion valve 6 to close when the refrigerant system meets the set closing conditions.

[0117] In an embodiment of the present invention, the fourth control module 14 is responsible for determining the closing conditions of the bypass valve 5 (SV1) and the bypass expansion valve 6 (EXV1) to ensure that the refrigerant system can timely close the bypass path and restore the normal refrigerant circulation process when bypass control is no longer required.

[0118] In this way, the introduction of this module further improves the automatic control of the system, ensuring that in various working modes, the system can not only respond to the pressure balance demand in a timely manner but also quickly close the bypass when the conditions return to normal, avoiding unnecessary energy consumption and system fluctuations.

[0119] Further, in some embodiments of the present invention, the fourth control module 14 is specifically configured to: when it is determined that the refrigerant system is currently in the refrigeration mode, if the high-pressure of the compressor 1 in the refrigerant system is less than the difference between the second set high-pressure and the second pressure value (for example, it can be 0.3 MPa), and the bypass expansion valve 6 maintains the minimum opening for at least the fourth set duration (for example, it can be 3 min), then control the bypass valve 5 and the bypass expansion valve 6 to close.

[0120] It can be understood that when the system is in the refrigeration mode, the closing conditions of the fourth control module 14 are as follows: (1) High-pressure check: Monitor the high-pressure (Pd) of the compressor 1 and determine whether it is less than the difference between the second set high-pressure (P2) and the second pressure value. This difference is set to ensure that the high-pressure is not only lower than a certain absolute value but also has a certain buffer space to avoid frequent opening and closing of the bypass control due to slight fluctuations. (2) Minimum opening duration of the bypass expansion valve 6: Confirm that the bypass expansion valve 6 has been operating at the minimum opening (i.e., the minimum controllable opening) for at least the fourth set duration. This is to ensure that the system has enough time to operate stably at the minimum opening of the bypass expansion valve 6 and observe whether the high-pressure can be maintained within the target range without immediately rebounding to a level where the bypass control needs to be reopened.

[0121] When the above two conditions are both met, the fourth control module 14 will trigger the closing of the bypass valve 5 and the bypass expansion valve 6, interrupting the bypass flow of the refrigerant and allowing the system to return to the normal refrigeration cycle. The purpose of this is to avoid maintaining the bypass state when bypass control is not needed, thereby saving energy, reducing unnecessary system losses, and maintaining the overall operating efficiency and stability of the system.

[0122] In this way, the present invention can achieve precise control of the pressure balance of the refrigerant system in the refrigeration mode, while ensuring that the bypass control can respond quickly when necessary and exit in a timely manner when conditions permit, so as to achieve the best system performance and energy management effect.

[0123] In some other embodiments of the present invention, the fourth control module 14 is specifically configured to: when it is determined that the refrigerant system is currently in the heating mode, if the low-pressure of the compressor 1 in the refrigerant system is greater than the sum value of the second set low-pressure and the third pressure value (for example, it can be 0.08 MPa), and the high-pressure is less than or equal to the difference between the third set high-pressure and the first pressure value (for example, it can be 0.3 MPa), and the superheat is greater than the second set superheat (for example, it can be 3 °C), and the bypass expansion valve 6 maintains the minimum opening for at least the fourth set duration (for example, it can be 3 min), then control the bypass valve 5 and the bypass expansion valve 6 to close.

[0124] In this embodiment, specifically for the heating mode, the shutdown conditions are as follows: (1) Low-pressure pressure check: Monitor the low-pressure pressure (Ps) of the compressor 1 and determine whether it is greater than the sum of the second set low-pressure pressure (P4) and the third pressure value. This condition ensures that the pressure on the low-pressure side is high enough to maintain the normal operation of the system in the heating mode, while leaving enough margin to prevent a sudden drop in pressure due to the exit of the bypass control. (2) High-pressure pressure check: Confirm that the high-pressure pressure (Pd) of the compressor 1 is less than or equal to the difference between the third set high-pressure pressure (P5) and the first pressure value. This indicates that the pressure on the high-pressure side has stabilized at a safe and effective level, and no additional bypass is required to reduce the pressure.

[0125] (3) Superheat check: Ensure that the suction superheat (DSH1) is greater than the second set superheat. The superheat check is to prevent the compressor 1 from sucking in too much liquid refrigerant and ensure the operation efficiency and safety of the compressor 1. (4) Minimum opening duration of the bypass expansion valve 6: Confirm that the bypass expansion valve 6 has been operating at the minimum opening for at least the fourth set duration. This step is to give the system enough time to adapt to the operating state at the minimum opening of the bypass expansion valve 6 and ensure that all parameters are stable within the predetermined range.

[0126] When all the above conditions are met, the fourth control module 14 will control the closing of the bypass valve 5 and the bypass expansion valve 6, ending the bypass flow of the refrigerant and returning the system to the normal heating cycle. This helps to avoid unnecessary energy consumption and ensure that the system can operate efficiently and stably in the heating mode, maintaining good user comfort and system reliability.

[0127] In summary, through the finely set shutdown conditions, the present invention can achieve precise control of the pressure balance of the refrigerant system in the heating mode, ensuring that the bypass control can be enabled when necessary and exited in a timely manner when the conditions are appropriate, thereby achieving the best system performance and energy management effect.

[0128] Next, the control method and control device of the refrigerant system proposed by the present invention will be described with reference to the accompanying drawings. Among them, before the detailed description of the embodiments of the present invention, the entire application scenario will be described first. The control method, control device, electronic device, and computer-readable storage medium of the refrigerant system in the embodiments of the present invention can be applied not only to the local refrigerant system but also to the cloud platform in the Internet field, or the cloud platform in other types of Internet fields, or can also be applied to third-party devices. Among them, the third-party devices may include various different types such as mobile phones, tablets, laptops, in-vehicle computers, and other intelligent terminals.

[0129] The following will only take the control method applicable to the refrigerant system as an example for illustration. It should be understood that the control method of the embodiments of the present invention can also be applicable to cloud platforms and third-party devices.

[0130] As Figure 1 and 2 shown, the control method of the refrigerant system according to the second aspect embodiment of the present invention has basically the same structural basis as the refrigerant system introduced in the first aspect embodiment of the present invention. Specifically, a high-low pressure balance pipeline 4 is connected between the exhaust port and the suction port of the compressor 1 of the refrigerant system, and a bypass valve 5 and a bypass expansion valve 6 are provided on the high-low pressure balance pipeline 4.

[0131] As Figure 3 shown, the control method of the refrigerant system includes: Step S1, obtaining ambient temperature information and operating parameter information; Step S2, controlling the opening and closing of the bypass valve 5 and adjusting the opening degree of the bypass expansion valve 6 according to the ambient temperature information and the operating parameter information.

[0132] The control method of the refrigerant system in the second aspect of the present invention also includes the specific control methods of the control device 20 introduced in the respective embodiments of the first aspect of the present invention, which will not be elaborated herein.

[0133] As Figure 1 and 2 shown, the control device 20 of the refrigerant system according to the third aspect embodiment of the present invention has basically the same structural basis as the refrigerant system introduced in the first aspect embodiment of the present invention. Specifically, a high-low pressure balance pipeline 4 is connected between the exhaust port and the suction port of the compressor 1 of the refrigerant system, and a bypass valve 5 and a bypass expansion valve 6 are provided on the high-low pressure balance pipeline 4.

[0134] As Figure 4 shown, the control device 20 of the refrigerant system includes: An acquisition module 110, configured to obtain ambient temperature information and operating parameter information; A control module 120, configured to control the opening and closing of the bypass valve 5 and adjust the opening degree of the bypass expansion valve 6 according to the ambient temperature information and the operating parameter information.

[0135] The control device 20 of the refrigerant system in the third aspect of the present invention also includes the specific control structures of the control device 20 introduced in the respective embodiments of the first aspect of the present invention, which will not be elaborated herein.

[0136] Figure 5 Illustrates a schematic diagram of the physical structure of an electronic device, as Figure 5As shown, the electronic device may include: a processor 810, a communications interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communications interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the control method of the refrigerant system, including: obtaining ambient temperature information and operating parameter information; controlling the opening and closing of the bypass valve 5 and adjusting the opening degree of the bypass expansion valve 6 according to the ambient temperature information and the operating parameter information.

[0137] In addition, when the logical instructions in the above-mentioned memory 830 are implemented in the form of software functional units and sold or used as independent products, 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 of the 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.

[0138] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the refrigerant system provided by the above-mentioned various methods, including: obtaining ambient temperature information and operating parameter information; controlling the opening and closing of the bypass valve 5 and adjusting the opening degree of the bypass expansion valve 6 according to the ambient temperature information and the operating parameter information.

[0139] On yet 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 control method of the refrigerant system provided by the above-mentioned various methods, including: obtaining ambient temperature information and operating parameter information; controlling the opening and closing of the bypass valve 5 and adjusting the opening degree of the bypass expansion valve 6 according to the ambient temperature information and the operating parameter information.

[0140] 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 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 efforts.

[0141] 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 this 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 of each embodiment or some parts of the embodiments.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not 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 recorded in the foregoing embodiments, or perform equivalent replacements on 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 each embodiment of the present invention.

Claims

1. A refrigerant system, characterized in that, Comprising: A compressor, an exhaust port and a suction port of the compressor are respectively connected with a first refrigerant pipeline and a second refrigerant pipeline, a high-low pressure balance pipeline is connected between the first refrigerant pipeline and the second refrigerant pipeline, and a bypass valve and a bypass expansion valve are arranged on the high-low pressure balance pipeline; A detection device for detecting ambient temperature information and operating parameter information of the compressor; A control device, connected to the detection device, includes an acquisition module and a control module, the acquisition module is used for acquiring the ambient temperature information and the operating parameter information; The control module is used for controlling the opening and closing of the bypass valve and adjusting the opening of the bypass expansion valve according to the ambient temperature information and the operating parameter information.

2. The refrigerant system according to claim 1, wherein The control module includes a first control module, a second control module and a third control module; The first control module is used for determining the set opening conditions of the bypass valve and the bypass expansion valve according to the current working mode of the refrigerant system; The second control module is used for controlling the bypass valve and the bypass expansion valve to open and last for at least a first set duration if the ambient temperature information and the operating parameter information meet the set opening conditions; The third control module is used for adjusting the opening of the bypass expansion valve according to the operating parameter information after the first set duration.

3. The refrigerant system according to claim 2, wherein The first control module is specifically used for: When the refrigerant system is in the refrigeration mode, determining that the set opening conditions are: the ambient temperature is greater than or equal to a first set ambient temperature, and the high-pressure of the compressor is greater than or equal to a first set high-pressure.

4. The refrigerant system according to claim 3, characterized in that, The third control module is specifically used for: After the first set duration; If the high-pressure of the compressor is greater than or equal to the first set high-pressure, controlling the opening of the bypass expansion valve to increase at a first rate; Or, if the high-pressure of the compressor is less than the first set high-pressure and greater than a second set high-pressure, controlling the opening of the bypass expansion valve to remain unchanged; Or, if the high-pressure of the compressor is less than or equal to the second set high-pressure, controlling the opening of the bypass expansion valve to decrease at a second rate.

5. The refrigerant system according to claim 2, characterized in that, The first control module is specifically used for: When the refrigerant system is in the heating mode, the set opening conditions include at least one of a first condition, a second condition and a third condition; The first condition includes: the ambient temperature is less than or equal to a second set ambient temperature, and the low-pressure of the compressor is less than a first set low-pressure; The second condition includes: the ambient temperature is less than or equal to the second set ambient temperature, and the high-pressure of the compressor is greater than a third set high-pressure and lasts for at least a second set duration; The third condition includes: the ambient temperature is less than or equal to the second set ambient temperature, and the suction superheat of the compressor is less than zero and lasts for at least a third set duration.

6. The refrigerant system according to claim 5, characterized in that The third control module is specifically used for: After the first set duration; If the low-pressure is less than or equal to the first set low-pressure, the high-pressure is greater than the third set high-pressure, and / or the suction superheat is less than a first set superheat, controlling the opening of the bypass expansion valve to increase at a first rate; Alternatively, when the low-pressure pressure is less than the first set low-pressure pressure and greater than the second set low-pressure pressure, the high-pressure pressure is less than or equal to the third set high-pressure pressure and greater than the fourth set high-pressure pressure, and / or the suction superheat is greater than the first set superheat and less than or equal to the second set superheat, the opening degree of the bypass expansion valve is controlled to remain unchanged; Alternatively, when the low-pressure pressure is greater than the second set low-pressure pressure, the high-pressure pressure is less than or equal to the difference between the third set high-pressure pressure and the first pressure value, and / or the suction superheat is greater than the second set superheat, the opening degree of the bypass expansion valve is controlled to close at a second rate; Among them, in the third control module, the priority of the above opening degree adjustment operations is arranged from largest to smallest as follows: controlling the opening degree of the bypass expansion valve to open at a first rate, controlling the opening degree of the bypass expansion valve to remain unchanged, and controlling the opening degree of the bypass expansion valve to close at a second rate.

7. The refrigerant system according to any one of claims 2 to 6, characterized in that, The control module further includes a fourth control module, and the fourth control module is used for: Determine the set closing conditions of the bypass valve and the bypass expansion valve according to the current working mode of the refrigerant system, and control the bypass valve and the bypass expansion valve to close when the refrigerant system meets the set closing conditions.

8. The refrigerant system according to claim 7, wherein Specifically, the fourth control module is used for: When it is determined that the high-pressure pressure of the compressor in the refrigerant system is less than the difference between the second set high-pressure pressure and the second pressure value, and the bypass expansion valve maintains the minimum opening degree for at least the fourth set time period according to the current refrigeration mode of the refrigerant system, control the bypass valve and the bypass expansion valve to close; Alternatively, when it is determined that the low-pressure pressure of the compressor in the refrigerant system is greater than the sum value of the second set low-pressure pressure and the third pressure value, the high-pressure pressure is less than or equal to the difference between the third set high-pressure pressure and the first pressure value, the superheat is greater than the second set superheat, and the bypass expansion valve maintains the minimum opening degree for at least the fourth set time period according to the current heating mode of the refrigerant system, control the bypass valve and the bypass expansion valve to close.

9. A control method for a refrigerant system, characterized in that, A high-low pressure balance pipeline is connected between the exhaust port and the suction port of the compressor of the refrigerant system, and a bypass valve and a bypass expansion valve are provided on the high-low pressure balance pipeline; the control method includes: Obtain the ambient temperature information and the operating parameter information of the compressor; Control the opening and closing of the bypass valve and adjust the opening degree of the bypass expansion valve according to the ambient temperature information and the operating parameter information.

10. A control device for a refrigerant system, characterized in that, A high-low pressure balance pipeline is connected between the exhaust port and the suction port of the compressor of the refrigerant system, and a bypass valve and a bypass expansion valve are provided on the high-low pressure balance pipeline; the control device includes: An acquisition module for acquiring the ambient temperature information and the operating parameter information of the compressor; A control module for controlling the opening and closing of the bypass valve and adjusting the opening degree of the bypass expansion valve according to the ambient temperature information and the operating parameter information.

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