A control method and device for preventing low pressure and back heating of a refrigeration device

Abstract

The application discloses a kind of control method and device of low pressure and back temperature of refrigeration equipment.The control method of low pressure and back temperature of the refrigeration equipment includes: obtaining the current temperature of each chamber and determining the current temperature control mode of each chamber according to the current temperature of each chamber;When at least one chamber current temperature control mode is constant temperature mode and another chamber current temperature control mode is cooling mode simultaneously, the cooling process of the refrigeration equipment is controlled according to the first preset compressor frequency, and the constant temperature process of the refrigeration equipment after cooling is controlled according to the second preset compressor frequency.By the first preset compressor frequency in the cooling process, the frequency of the refrigeration equipment is adjusted in real time, and the cooling process is automatically adjusted according to the compressor frequency to avoid low pressure alarm.In the constant temperature process after cooling, the frequency of the refrigeration equipment is adjusted in real time by the second preset compressor frequency, and the constant temperature is automatically adjusted according to the compressor frequency to avoid the case of temperature being too high.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a method and apparatus for controlling low pressure and temperature recovery in refrigeration equipment. Background Technology

[0002] The refrigeration system has multiple evaporation systems. At the same time, some evaporation systems need to maintain a constant low temperature, while others need to cool down. In order to achieve cooling, the compressor needs to increase its frequency, which will trigger a low-pressure alarm. After cooling, in order to save energy, the frequency needs to be reduced, which will cause the temperature to be too high.

[0003] However, in existing refrigeration system controls, fixed valve step control is often used for low temperature control. However, this fixed valve step control cannot automatically adjust the low pressure and excessive temperature problems caused by frequency increase and decrease in the system. Summary of the Invention

[0004] This invention provides a control method and device for preventing low pressure and temperature rebound in refrigeration equipment, so as to enable the refrigeration equipment to adaptively adjust the cooling and constant temperature process when simultaneously performing constant temperature and low temperature operation, thereby avoiding low pressure and excessively high temperature problems caused by frequency increase and decrease.

[0005] According to one aspect of the present invention, a method for controlling low pressure and temperature rebound in a refrigeration device is provided, the method comprising:

[0006] Obtain the current temperature of each room and determine the current temperature control mode of each room based on the current temperature of each room.

[0007] When at least one compartment is in constant temperature mode and another compartment is in cooling mode, the cooling process of the refrigeration equipment is regulated according to the first preset compressor frequency, and the constant temperature process of the refrigeration equipment after cooling is regulated according to the second preset compressor frequency.

[0008] Optionally, the cooling process of the refrigeration equipment according to the first preset compressor frequency includes:

[0009] During the cooling process, the compressor frequency is increased according to the first preset compressor frequency, and the opening degree of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber is controlled according to the first preset compressor frequency.

[0010] Optionally, during the cooling process, controlling the opening degree of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber according to the first preset compressor frequency includes:

[0011] During the cooling process, obtain the first current valve step of the electronic expansion valve of the constant temperature mode chamber and the first current valve step of the electronic expansion valve of the cooling mode chamber.

[0012] The first preset multiple of the first preset compressor frequency is used as the first compensation valve step;

[0013] The opening degree of the electronic expansion valve of the constant temperature mode chamber is adjusted according to the first current valve step and the first compensation valve step of the electronic expansion valve of the constant temperature mode chamber.

[0014] The opening degree of the electronic expansion valve of the cooling mode compartment is adjusted according to the first current valve step and the first compensation valve step.

[0015] Optionally, adjusting the opening degree of the electronic expansion valve of the constant temperature mode compartment according to the first current valve step and the first compensation valve step includes:

[0016] The opening degree of the electronic expansion valve of the constant temperature mode chamber is adjusted according to the sum of the first current valve step and the first compensation valve step.

[0017] The step of adjusting the opening degree of the electronic expansion valve of the cooling mode compartment according to the first current valve step and the first compensation valve step includes:

[0018] The opening degree of the electronic expansion valve of the cooling mode compartment is adjusted according to the sum of the first current valve step and the first compensation valve step.

[0019] Optionally, the first preset compressor frequency is the linear frequency variation curve of the first preset compressor.

[0020] Optionally, the process of regulating the refrigeration equipment to maintain a constant temperature after cooling according to the second preset compressor frequency includes:

[0021] During the constant temperature process after cooling, the compressor frequency is reduced according to the second preset compressor frequency, and the opening degree of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber is controlled according to the second preset compressor frequency.

[0022] Optionally, in the constant temperature process after cooling, controlling the opening degree of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber according to the second preset compressor frequency includes:

[0023] The second current valve step of the electronic expansion valve in the constant temperature mode chamber and the second current valve step of the electronic expansion valve in the cooling mode chamber are obtained during the constant temperature process after cooling.

[0024] The second preset multiple of the second preset compressor frequency is used as the second compensation valve step;

[0025] The opening degree of the electronic expansion valve of the constant temperature mode chamber is adjusted according to the second current valve step and the second compensation valve step of the electronic expansion valve of the constant temperature mode chamber.

[0026] The opening degree of the electronic expansion valve of the cooling mode compartment is adjusted according to the second current valve step and the second compensation valve step.

[0027] Optionally, adjusting the opening degree of the electronic expansion valve of the constant temperature mode compartment according to the second current valve step and the second compensation valve step includes:

[0028] The opening degree of the electronic expansion valve of the constant temperature mode chamber is adjusted according to the difference between the second current valve step and the second compensation valve step of the electronic expansion valve of the constant temperature mode chamber.

[0029] The step of adjusting the opening degree of the electronic expansion valve of the cooling mode compartment according to the second current valve step and the second compensation valve step includes:

[0030] The opening degree of the electronic expansion valve of the cooling mode compartment is adjusted according to the difference between the second current valve step and the second compensation valve step of the electronic expansion valve of the cooling mode compartment.

[0031] Optionally, the second preset compressor frequency is the linear frequency variation curve of the second preset compressor.

[0032] According to another aspect of the present invention, a control device for preventing low pressure and temperature rebound in a refrigeration device is provided, the control device comprising:

[0033] The current temperature acquisition module is used to acquire the current temperature of each room;

[0034] The current temperature control mode determination module is used to determine the current temperature control mode of each room based on the current temperature of each room.

[0035] The control module is used to regulate the cooling process of the refrigeration equipment according to a first preset compressor frequency when at least one room is in constant temperature mode and another room is in cooling mode, and to regulate the constant temperature process of the refrigeration equipment after cooling according to a second preset compressor frequency.

[0036] The technical solution of this invention provides a method and apparatus for controlling low pressure and temperature rebound in a refrigeration device. The method includes: acquiring the current temperature of each compartment and determining the current temperature control mode for each compartment based on that temperature; when at least one compartment is in a constant temperature control mode and another compartment is in a cooling mode, adjusting the cooling process of the refrigeration device according to a first preset compressor frequency, and adjusting the constant temperature process of the refrigeration device according to a second preset compressor frequency. Therefore, this method can achieve the following: by real-time judgment of the current temperature control mode of each compartment, and when a compartment simultaneously exhibits both constant temperature and cooling modes, during the cooling process, the first preset compressor frequency is used to adjust the frequency of the refrigeration device for frequency increase and cooling, automatically adjusting the cooling process according to the compressor frequency to avoid low pressure alarms. Furthermore, during the constant temperature process after cooling, the second preset compressor frequency is used to adjust the frequency of the refrigeration device for frequency decrease, automatically adjusting the constant temperature according to the compressor frequency to avoid overheating. This allows the refrigeration equipment to simultaneously maintain constant and low temperatures by adaptively adjusting the compressor frequency during the cooling process and the subsequent constant temperature process, thereby preventing low pressure and temperature rebound.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart of a method for controlling low pressure and temperature recovery in a refrigeration device provided in an embodiment of the present invention;

[0040] Figure 2 This is a flowchart of another method for controlling low pressure and temperature recovery in a refrigeration device provided in an embodiment of the present invention;

[0041] Figure 3 This is a flowchart of another method for controlling low pressure and temperature recovery in a refrigeration device provided in an embodiment of the present invention;

[0042] Figure 4 This is a flowchart of another method for controlling low pressure and temperature recovery in a refrigeration device provided in an embodiment of the present invention;

[0043] Figure 5 This is a structural block diagram of a control device for preventing low pressure and temperature rebound in a refrigeration equipment provided in an embodiment of the present invention. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0046] Figure 1 This is a flowchart illustrating a control method for preventing low pressure and temperature rebound in a refrigeration device according to an embodiment of the present invention. This embodiment is applicable to variable frequency multi-split refrigeration devices or systems where at least one evaporator system maintains a constant temperature while another evaporator system cools down, preventing low pressure and temperature rebound. This method can be executed by a control device for preventing low pressure and temperature rebound in the refrigeration device. This control device can be implemented in hardware and / or software and can be configured in the control system of the refrigeration device, such as a controller. "Variable frequency multi-split" refers to using the same variable frequency compressor to control multiple evaporator systems. Figure 1 As shown, the method includes the following steps:

[0047] S110. Obtain the current temperature of each room and determine the current temperature control mode of each room based on the current temperature of each room.

[0048] The current temperature of each compartment can be obtained in real time through temperature detection elements, such as temperature sensors, in each compartment.

[0049] The current temperature control mode includes at least one of the following: heating mode, constant temperature mode, and cooling mode.

[0050] The specific implementation of determining the current temperature control mode of each room based on its current temperature can be as follows: Set a temperature threshold for each room (the temperature thresholds for each room may not be the same; specific settings can be made according to actual conditions, and no specific limitations are made here). Obtain the current temperature of each room and compare it with its respective temperature threshold to determine the current temperature control mode of each room. For example, if the current temperature of a room is greater than its temperature threshold, the current temperature control mode for that room is determined to be a cooling mode. If the current temperature of a room is less than its temperature threshold, the current temperature control mode for that room is determined to be a heating mode. If the current temperature of a room is equal to its temperature threshold, the current temperature control mode for that room is determined to be a constant temperature mode.

[0051] S120. When at least one room is in constant temperature mode and another room is in cooling mode, the cooling process of the refrigeration equipment is regulated according to the first preset compressor frequency, and the constant temperature process of the refrigeration equipment after cooling is regulated according to the second preset compressor frequency.

[0052] Among them, the first preset compressor frequency and the second preset compressor frequency are frequencies that change in real time, that is, non-fixed frequency values.

[0053] In the technical solution of this embodiment, the working principle of the low-pressure protection and temperature recovery control method of the refrigeration equipment is as follows: (Refer to...) Figure 1First, the current temperature of each compartment is acquired, and the current temperature control mode of each compartment is determined based on the current temperature of each compartment. Then, it is determined that when at least one compartment is in constant temperature mode and another compartment is in cooling mode, the cooling process of the refrigeration equipment is adjusted according to a first preset compressor frequency, and the constant temperature process of the refrigeration equipment after cooling is adjusted according to a second preset compressor frequency. Specifically, when at least one compartment is in constant temperature mode and another compartment is in cooling mode, it indicates that the refrigeration equipment needs to perform both constant temperature and cooling simultaneously. During the cooling process, the refrigeration equipment needs to meet the constant temperature requirement of the constant temperature mode compartment and the cooling requirement of the cooling mode compartment. By adjusting the cooling of the refrigeration equipment in real time according to the first preset compressor frequency and the frequency change of the compressor, the temperature requirements of both the constant temperature mode and cooling mode compartments can be met simultaneously, and the low pressure problem caused by frequency-increasing cooling can be avoided. During the temperature stabilization process after cooling, the refrigeration equipment's temperature control is adjusted in real time according to the second preset compressor frequency, based on the compressor frequency changes, thus avoiding overheating. This allows the refrigeration equipment to adaptively adjust the cooling and stabilization processes while simultaneously performing temperature stabilization and cooling, solving the low-pressure and temperature rebound problems of multi-split inverter systems, improving the equipment's adaptability, stability, and overall performance, and reducing energy consumption and maintenance costs.

[0054] The technical solution of this embodiment provides a method for controlling low pressure and temperature rebound in a refrigeration device. This method includes: acquiring the current temperature of each compartment and determining the current temperature control mode for each compartment based on that temperature; when at least one compartment is in a constant temperature control mode and another compartment is in a cooling mode, adjusting the cooling process of the refrigeration device according to a first preset compressor frequency, and adjusting the constant temperature process after cooling according to a second preset compressor frequency. Therefore, this method can achieve the following: by real-time judgment of the current temperature control mode of each compartment, and when both constant temperature and cooling modes exist simultaneously in a compartment, during the cooling process, the first preset compressor frequency is used to adjust the frequency of the refrigeration device for frequency increase and cooling, automatically adjusting the cooling process according to the compressor frequency to avoid low pressure alarms. Furthermore, during the constant temperature process after cooling, the second preset compressor frequency is used to adjust the frequency of the refrigeration device for frequency decrease, automatically adjusting the constant temperature according to the compressor frequency to avoid overheating. This allows the refrigeration equipment to simultaneously maintain constant and low temperatures by adaptively adjusting the compressor frequency during the cooling process and the subsequent constant temperature process, thereby preventing low pressure and temperature rebound.

[0055] Figure 2This is a flowchart of another method for controlling low pressure and temperature recovery in a refrigeration device provided in an embodiment of the present invention. Optionally, based on the above embodiments, refer to... Figure 2 The method also includes the following steps:

[0056] S210. Obtain the current temperature of each room and determine the current temperature control mode of each room based on the current temperature of each room.

[0057] S220. Determine whether at least one room is currently in constant temperature control mode and another room is currently in cooling mode. If so, execute steps S230 and S240 respectively.

[0058] S230. During the cooling process, the compressor frequency is increased according to the first preset compressor frequency, and the opening degree of the electronic expansion valve of the constant temperature mode chamber and the cooling mode chamber is controlled according to the first preset compressor frequency.

[0059] Among them, the constant temperature mode room refers to the room whose current temperature control mode is constant temperature mode, and the cooling mode room refers to the room whose current temperature control mode is cooling mode.

[0060] During the cooling process, the compressor of the control equipment is operated at the first preset compressor frequency.

[0061] Specifically, when at least one compartment is currently in constant temperature control mode and another compartment is currently in cooling mode, the control equipment simultaneously performs constant temperature and cooling. During the cooling process, the compressor is controlled to increase its frequency for cooling according to the first preset compressor frequency. At the same time, the opening of the electronic expansion valves of the constant temperature mode compartment and the cooling mode compartment is controlled according to the first preset compressor frequency. By adjusting the opening of the electronic expansion valves of the constant temperature mode compartment and the cooling mode compartment in real time through the compressor frequency, the cooling capacity of the system is adjusted to a reasonable range, thereby adjusting the system temperature to a reasonable range. This satisfies the constant temperature requirement of the constant temperature mode compartment and the cooling requirement of the cooling mode compartment, avoiding low pressure problems caused by frequency increase cooling.

[0062] S240. During the constant temperature process after cooling, the compressor frequency is reduced according to the second preset compressor frequency, and the opening degree of the electronic expansion valve of the constant temperature mode chamber and the cooling mode chamber is controlled according to the second preset compressor frequency.

[0063] During the constant temperature process after cooling, the compressor of the control equipment will operate at the second preset compressor frequency.

[0064] Specifically, the control equipment simultaneously performs temperature control and cooling. During the temperature stabilization process after cooling, the compressor frequency is reduced according to the second preset compressor frequency to save energy. Simultaneously, the opening of the electronic expansion valves in both the temperature control and cooling modes is controlled based on the second preset compressor frequency. By adjusting the compressor frequency in real time, the opening of the electronic expansion valves in both modes is regulated to maintain the system's cooling capacity within a reasonable range, thereby controlling the system temperature and preventing overheating during system recirculation.

[0065] In the technical solution of this embodiment, the working principle of the low-pressure protection and temperature recovery control method of the refrigeration equipment is as follows: (Refer to...) Figure 2 First, the current temperature of each compartment is acquired, and the current temperature control mode for each compartment is determined based on this temperature. Then, it is determined whether at least one compartment is simultaneously in constant temperature mode and another compartment is in cooling mode. If so, during the cooling process, the compressor frequency is increased according to a first preset compressor frequency, and the opening of the electronic expansion valves in both the constant temperature and cooling mode compartments is controlled according to the same frequency. During the subsequent constant temperature process, the compressor frequency is decreased according to a second preset compressor frequency, and the opening of the electronic expansion valves in both compartments is controlled according to the same frequency. Therefore, when the refrigeration equipment simultaneously performs constant and cooling operations, by adjusting the compressor frequency and the opening of the electronic expansion valves in both compartments in real time according to the first preset compressor frequency during the cooling process, the system's cooling capacity is kept within a reasonable range, thereby regulating the system temperature and preventing low-pressure problems caused by frequency increases. Furthermore, during the temperature-maintaining process after cooling, the compressor frequency and the opening of the electronic expansion valves in the constant-temperature mode and cooling mode compartments are adjusted in real time according to the second preset compressor frequency. This ensures that the system's cooling capacity remains within a reasonable range, thereby regulating the system temperature and preventing excessively high recirculation temperatures during frequency reduction. This allows the refrigeration equipment to adaptively adjust the cooling and temperature-maintaining processes while simultaneously performing constant-temperature and cooling operations. It solves the low-pressure and recirculation problems in multi-split inverter systems, improves the equipment's adaptability, stability, and overall performance, and reduces energy consumption and maintenance costs.

[0066] Figure 3 This is a flowchart of another method for controlling low pressure and temperature recovery in a refrigeration device provided in an embodiment of the present invention. Optionally, based on the above embodiments, refer to... Figure 3 The method includes the following steps:

[0067] S310. Obtain the current temperature of each room and determine the current temperature control mode of each room based on the current temperature of each room.

[0068] S320. Determine whether at least one room is currently in constant temperature control mode and another room is currently in cooling mode. If so, proceed to step S331.

[0069] S331. During the cooling process, the compressor frequency is increased according to the first preset compressor frequency.

[0070] S332. Obtain the first current valve step of the electronic expansion valve in the constant temperature mode chamber and the first current valve step of the electronic expansion valve in the cooling mode chamber during the cooling process.

[0071] S333, take the first preset multiple of the first preset compressor frequency as the first compensation valve step.

[0072] The first preset compressor frequency is a frequency that changes in real time. Therefore, the first compensation valve step is also a compensation valve step that changes in real time. The valve step compensation amount of the electronic expansion valve of the constant temperature mode chamber and the cooling mode chamber in the cooling process is determined in real time by the compressor frequency that changes in real time. This is conducive to accurately controlling the opening degree of the electronic expansion valve of the constant temperature mode chamber and the cooling mode chamber in the cooling process, which in turn is conducive to controlling the cooling capacity and temperature of the system and avoiding the situation of rising frequency and low pressure.

[0073] The first preset multiple is related to parameters such as the size of the refrigeration system compartment. The specific value of the first preset multiple can be set according to the actual situation, and no specific limitation is made here.

[0074] S334. Adjust the opening degree of the electronic expansion valve of the constant temperature mode chamber according to the first current valve step and the first compensation valve step of the electronic expansion valve of the constant temperature mode chamber; adjust the opening degree of the electronic expansion valve of the cooling mode chamber according to the first current valve step and the first compensation valve step of the electronic expansion valve of the cooling mode chamber.

[0075] Specifically, when the refrigeration equipment simultaneously performs constant temperature and cooling, during the cooling process, the current valve step of the electronic expansion valve in the constant temperature mode compartment and the current valve step of the electronic expansion valve in the cooling mode compartment are acquired in real time. A first preset multiple of the first preset compressor frequency is used as the first compensation valve step. The opening degree of the electronic expansion valve in the constant temperature mode compartment is adjusted according to the first current valve step and the first compensation valve step; the opening degree of the electronic expansion valve in the cooling mode compartment is also adjusted according to the first current valve step and the first compensation valve step. Therefore, during the cooling process, the compressor frequency is adjusted in real time by the first preset compressor frequency, and the valve step compensation amount of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber is determined in real time by the real-time changing compressor frequency. Then, the opening degree of the electronic expansion valve of the constant temperature mode chamber is precisely controlled according to the real-time determined valve step compensation amount and the current valve step of the constant temperature mode chamber, and the opening degree of the electronic expansion valve of the cooling mode chamber is precisely controlled according to the real-time determined valve step compensation amount and the current valve step of the cooling mode chamber. This helps to control the cooling capacity and temperature of the system and avoid the situation of frequency increase and low pressure.

[0076] S341. During the constant temperature process after cooling, the compressor frequency is reduced according to the second preset compressor frequency.

[0077] S342. Obtain the second current valve step of the electronic expansion valve in the constant temperature mode chamber and the second current valve step of the electronic expansion valve in the cooling mode chamber during the constant temperature process after cooling.

[0078] S343, Use the second preset multiple of the second preset compressor frequency as the second compensation valve step.

[0079] The second preset compressor frequency is a real-time changing frequency, and therefore the second compensation valve step is also a real-time changing compensation valve step. By using the real-time changing compressor frequency, the valve step compensation amount of the electronic expansion valves in the constant temperature mode chamber and the cooling mode chamber is determined in real time during the constant temperature process after cooling. This is beneficial for accurately controlling the opening degree of the electronic expansion valves in the constant temperature mode chamber and the cooling mode chamber during the constant temperature process after cooling, which in turn is beneficial for controlling the cooling capacity and temperature of the system and avoiding the situation of frequency reduction and temperature rebound.

[0080] The second preset multiple is related to parameters such as the size of the refrigeration system compartment. The specific value of the second preset multiple can be set according to the actual situation, and no specific limitation is made here.

[0081] S344. Adjust the opening degree of the electronic expansion valve of the constant temperature mode chamber according to the second current valve step and the second compensation valve step of the electronic expansion valve of the constant temperature mode chamber; adjust the opening degree of the electronic expansion valve of the cooling mode chamber according to the second current valve step and the second compensation valve step of the electronic expansion valve of the cooling mode chamber.

[0082] Specifically, when the refrigeration equipment simultaneously performs constant temperature and cooling, during the constant temperature process after cooling, the current valve step of the electronic expansion valve in the constant temperature mode compartment and the current valve step of the electronic expansion valve in the cooling mode compartment are acquired in real time. A second preset multiple of the second preset compressor frequency is used as the second compensation valve step. The opening degree of the electronic expansion valve in the constant temperature mode compartment is adjusted according to the second current valve step and the second compensation valve step; the opening degree of the electronic expansion valve in the cooling mode compartment is also adjusted according to the second current valve step and the second compensation valve step. Therefore, during the constant-temperature process after cooling, the compressor frequency is adjusted in real time by the second preset compressor frequency, and the valve step compensation amount of the electronic expansion valves in the constant-temperature mode chamber and the cooling mode chamber is determined in real time by the real-time changing compressor frequency. Then, the opening degree of the electronic expansion valve in the constant-temperature mode chamber is precisely controlled according to the real-time determined valve step compensation amount and the current valve step of the constant-temperature mode chamber, and the opening degree of the electronic expansion valve in the cooling mode chamber is precisely controlled according to the real-time determined valve step compensation amount and the current valve step of the cooling mode chamber. This is beneficial to control the cooling capacity and temperature of the system and avoid the situation of frequency reduction and temperature rebound.

[0083] In the technical solution of this embodiment, the working principle of the low-pressure protection and temperature recovery control method of the refrigeration equipment is as follows: (Refer to...) Figure 3First, the current temperature of each compartment is acquired, and the current temperature control mode of each compartment is determined based on the current temperature of each compartment. Then, it is determined whether at least one compartment's current temperature control mode is constant temperature mode, and another compartment's current temperature control mode is cooling mode. If so, during the cooling process, the compressor frequency is increased according to a first preset compressor frequency. The first current valve step of the electronic expansion valve in the constant temperature mode compartment and the first current valve step of the electronic expansion valve in the cooling mode compartment are acquired during the cooling process. A first preset multiple of the first preset compressor frequency is used as the first compensation valve step. The opening degree of the electronic expansion valve in the constant temperature mode compartment is adjusted according to the first current valve step and the first compensation valve step; the opening degree of the electronic expansion valve in the cooling mode compartment is also adjusted according to the first current valve step and the first compensation valve step. During the constant temperature process after cooling, the compressor frequency is decreased according to a second preset compressor frequency. The second current valve step of the electronic expansion valve in the constant temperature mode compartment and the second current valve step of the electronic expansion valve in the cooling mode compartment are obtained during the constant temperature process after cooling. A second preset multiple of the second preset compressor frequency is used as the second compensation valve step. The opening degree of the electronic expansion valve in the constant temperature mode compartment is adjusted according to the second current valve step and the second compensation valve step; the opening degree of the electronic expansion valve in the cooling mode compartment is also adjusted according to the second current valve step and the second compensation valve step. Therefore, when the refrigeration equipment simultaneously performs constant temperature and cooling, the valve step compensation amount of the electronic expansion valves in the constant temperature mode compartment and the cooling mode compartment is determined in real time by the real-time change of the compressor frequency, respectively, during the cooling process and the subsequent constant temperature process. This facilitates precise control of the opening degree of the electronic expansion valves in the constant temperature mode compartment and the cooling mode compartment, thereby helping to control the cooling capacity and temperature of the system and avoiding situations of frequency increase and low pressure, and frequency decrease and temperature recovery. This enables the refrigeration equipment to adaptively adjust the cooling and constant temperature processes while simultaneously maintaining and cooling the temperature, solving the low pressure and temperature rebound problems of variable frequency multi-split systems, improving the adaptability, stability and overall performance of the equipment, and reducing the energy consumption and maintenance costs of the equipment.

[0084] Optionally, the first preset compressor frequency is the linear frequency variation curve of the first preset compressor.

[0085] Wherein, the first preset compressor frequency is a linear frequency change curve, and the first compensation valve step is also a linear change curve. Therefore, during the cooling process, the compressor frequency is adjusted in real time according to the linearly changing first preset compressor frequency, and the first compensation valve step is determined in real time. This allows for real-time control of the opening degree of the electronic expansion valves in the constant temperature mode compartment and the cooling mode compartment during the cooling process, which is beneficial for controlling the cooling capacity and temperature of the system and avoiding the situation of rising frequency and low pressure.

[0086] The linear slope of the linear frequency change curve of the first preset compressor can be set according to the actual situation, and no specific limitation is made here.

[0087] Optionally, the second preset compressor frequency is the linear frequency variation curve of the second preset compressor.

[0088] Wherein, the second preset compressor frequency follows a linear frequency change curve, and the second compensation valve step also follows a linear frequency change curve. Therefore, during the isothermal process after cooling, the compressor frequency is adjusted in real time according to the linearly changing second preset compressor frequency, and the second compensation valve step is determined in real time. This allows for real-time control of the opening degree of the electronic expansion valves in the isothermal mode chamber and the cooling mode chamber during the isothermal process after cooling, which is beneficial for controlling the cooling capacity and temperature of the system and avoiding excessively high temperatures during frequency reduction and temperature recovery.

[0089] The linear slope of the second preset compressor linear frequency change curve can be set according to the actual situation, and no specific limitation is made here.

[0090] Figure 4 This is a flowchart of another method for controlling low pressure and temperature recovery in a refrigeration device provided in an embodiment of the present invention. Optionally, based on the above embodiments, refer to... Figure 4 The method includes the following steps:

[0091] S410: Obtain the current temperature of each room and determine the current temperature control mode of each room based on the current temperature of each room.

[0092] S420. Determine whether at least one room is currently in constant temperature control mode and another room is currently in cooling mode. If so, proceed to step S431.

[0093] S431. During the cooling process, the compressor frequency is increased according to the first preset compressor frequency.

[0094] S432. Obtain the first current valve step of the electronic expansion valve in the constant temperature mode chamber and the first current valve step of the electronic expansion valve in the cooling mode chamber during the cooling process.

[0095] S433, take the first preset multiple of the first preset compressor frequency as the first compensation valve step.

[0096] S434. Adjust the opening degree of the electronic expansion valve of the constant temperature mode chamber according to the sum of the first current valve step and the first compensation valve step of the electronic expansion valve of the constant temperature mode chamber; adjust the opening degree of the electronic expansion valve of the cooling mode chamber according to the sum of the first current valve step and the first compensation valve step of the electronic expansion valve of the cooling mode chamber.

[0097] Specifically, when the refrigeration equipment simultaneously performs constant temperature and cooling, during the cooling process, the current valve step of the electronic expansion valve in the constant temperature mode compartment and the current valve step of the electronic expansion valve in the cooling mode compartment are acquired in real time. A first preset multiple of the first preset compressor frequency is used as the first compensation valve step. The opening degree of the electronic expansion valve in the constant temperature mode compartment is adjusted according to the sum of the first current valve step and the first compensation valve step; the opening degree of the electronic expansion valve in the cooling mode compartment is also adjusted according to the sum of the first current valve step and the first compensation valve step. Therefore, during the cooling process, the compressor frequency is adjusted in real time by the first preset compressor frequency, and the valve step compensation amount of the electronic expansion valve in the constant temperature mode chamber and the cooling mode chamber is determined in real time by the real-time changing compressor frequency. Then, the valve step compensation amount determined in real time is added to the current valve step of the constant temperature mode chamber to accurately control the opening of the electronic expansion valve in the constant temperature mode chamber, and the valve step compensation amount determined in real time is added to the current valve step of the cooling mode chamber to accurately control the opening of the electronic expansion valve in the cooling mode chamber. This is beneficial for controlling the cooling capacity and temperature of the system and avoiding the situation of rising frequency and low pressure.

[0098] S441. During the constant temperature process after cooling, the compressor frequency is reduced according to the second preset compressor frequency.

[0099] S442. Obtain the second current valve step of the electronic expansion valve in the constant temperature mode chamber and the second current valve step of the electronic expansion valve in the cooling mode chamber during the constant temperature process after cooling.

[0100] S443, Use the second preset multiple of the second preset compressor frequency as the second compensation valve step.

[0101] S444. Adjust the opening degree of the electronic expansion valve of the constant temperature mode chamber according to the difference between the second current valve step and the second compensation valve step of the electronic expansion valve of the constant temperature mode chamber; adjust the opening degree of the electronic expansion valve of the cooling mode chamber according to the difference between the second current valve step and the second compensation valve step of the electronic expansion valve of the cooling mode chamber.

[0102] Specifically, when the refrigeration equipment simultaneously performs constant temperature and cooling, during the constant temperature process after cooling, the current valve step of the electronic expansion valve in the constant temperature mode compartment and the current valve step of the electronic expansion valve in the cooling mode compartment are acquired in real time. A second preset multiple of the second preset compressor frequency is used as the second compensation valve step. The opening degree of the electronic expansion valve in the constant temperature mode compartment is adjusted according to the difference between the second current valve step and the second compensation valve step; the opening degree of the electronic expansion valve in the cooling mode compartment is also adjusted according to the difference between the second current valve step and the second compensation valve step. Therefore, during the constant-temperature process after cooling, the compressor frequency is adjusted in real time by the second preset compressor frequency, and the valve step compensation amount of the electronic expansion valve in the constant-temperature mode chamber and the cooling mode chamber is determined in real time by the real-time changing compressor frequency. Then, the current valve step of the constant-temperature mode chamber is added to the real-time determined valve step compensation amount to accurately control the opening of the electronic expansion valve in the constant-temperature mode chamber, and the current valve step of the cooling mode chamber is subtracted from the real-time determined valve step compensation amount to accurately control the opening of the electronic expansion valve in the cooling mode chamber. This is beneficial for controlling the cooling capacity and temperature of the system and avoiding the situation of frequency reduction and temperature rebound.

[0103] In the technical solution of this embodiment, the working principle of the low-pressure protection and temperature recovery control method of the refrigeration equipment is as follows: (Refer to...) Figure 4First, the current temperature of each compartment is acquired, and the current temperature control mode of each compartment is determined based on the current temperature of each compartment. Then, it is determined whether at least one compartment's current temperature control mode is constant temperature mode, and another compartment's current temperature control mode is cooling mode. If so, during the cooling process, the compressor frequency is increased according to a first preset compressor frequency. The first current valve step of the electronic expansion valve in the constant temperature mode compartment and the first current valve step of the electronic expansion valve in the cooling mode compartment are acquired during the cooling process. A first preset multiple of the first preset compressor frequency is used as the first compensation valve step. The opening degree of the electronic expansion valve in the constant temperature mode compartment is adjusted according to the sum of the first current valve step and the first compensation valve step; the opening degree of the electronic expansion valve in the cooling mode compartment is also adjusted according to the sum of the first current valve step and the first compensation valve step. During the constant temperature process after cooling, the compressor frequency is decreased according to a second preset compressor frequency. The second current valve step of the electronic expansion valve in the constant temperature mode compartment and the second current valve step of the electronic expansion valve in the cooling mode compartment are obtained during the constant temperature process after cooling. A second preset multiple of the second preset compressor frequency is used as the second compensation valve step. The opening degree of the electronic expansion valve in the constant temperature mode compartment is adjusted according to the difference between the second current valve step and the second compensation valve step; the opening degree of the electronic expansion valve in the cooling mode compartment is also adjusted according to the difference between the second current valve step and the second compensation valve step. Therefore, when the refrigeration equipment simultaneously performs constant temperature and cooling, the valve step compensation amount of the electronic expansion valves in the constant temperature mode compartment and the cooling mode compartment is determined in real time by the real-time change of the compressor frequency, respectively, during the cooling process and the subsequent constant temperature process. This facilitates precise control of the opening degree of the electronic expansion valves in the constant temperature mode compartment and the cooling mode compartment, thereby helping to control the cooling capacity and temperature of the system and avoiding situations of frequency increase and low pressure, and frequency decrease and temperature recovery. This enables the refrigeration equipment to adaptively adjust the cooling and constant temperature processes while simultaneously maintaining and cooling the temperature, solving the low pressure and temperature rebound problems of variable frequency multi-split systems, improving the adaptability, stability and overall performance of the equipment, and reducing the energy consumption and maintenance costs of the equipment.

[0104] Figure 5 This is a structural block diagram of a control device for preventing low pressure and temperature rebound in a refrigeration device provided in an embodiment of the present invention. The present invention also provides a control device for preventing low pressure and temperature rebound in a refrigeration device, see reference... Figure 5The low-pressure and temperature recovery control device 100 of the refrigeration equipment includes: a current temperature acquisition module 101 for acquiring the current temperature of each compartment; a current temperature control mode determination module 102 for determining the current temperature control mode of each compartment based on the current temperature of each compartment; and a regulation module 103 for regulating the cooling process of the refrigeration equipment according to a first preset compressor frequency and regulating the constant temperature process of the refrigeration equipment according to a second preset compressor frequency when at least one compartment's current temperature control mode is constant temperature mode and another compartment's current temperature control mode is cooling mode.

[0105] The technical solution of this embodiment provides a control device for preventing low pressure and temperature rebound in a refrigeration equipment. This control device includes: a current temperature acquisition module for acquiring the current temperature of each compartment; a current temperature control mode determination module for determining the current temperature control mode of each compartment based on its current temperature; and a control module for regulating the cooling process of the refrigeration equipment according to a first preset compressor frequency and regulating the constant temperature process of the refrigeration equipment according to a second preset compressor frequency when at least one compartment's current temperature control mode is constant temperature mode and another compartment's current temperature control mode is cooling mode. Therefore, this device can: by real-time judgment of the current temperature control mode of each compartment, and when a compartment simultaneously exhibits both constant temperature and cooling modes, during the cooling process, the first preset compressor frequency is used to real-time regulate the frequency increase and cooling of the refrigeration equipment, automatically adjusting the cooling process according to the compressor frequency to avoid low pressure alarms. Furthermore, during the constant temperature process after cooling, the second preset compressor frequency is used to real-time regulate the frequency decrease of the refrigeration equipment, automatically adjusting the constant temperature according to the compressor frequency to avoid overheating. This allows the refrigeration equipment to simultaneously maintain constant and low temperatures by adaptively adjusting the compressor frequency during the cooling process and the subsequent constant temperature process, thereby preventing low pressure and temperature rebound.

[0106] Optionally, the control module further includes: a cooling process opening control unit, used to control the compressor frequency to increase according to the first preset compressor frequency during the cooling process, and at the same time control the opening of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber according to the first preset compressor frequency.

[0107] Optionally, the cooling process opening control unit is also used to: obtain the first current valve step of the electronic expansion valve of the constant temperature mode chamber and the first current valve step of the electronic expansion valve of the cooling mode chamber during the cooling process.

[0108] The first preset multiple of the first preset compressor frequency is used as the first compensation valve step;

[0109] The opening degree of the electronic expansion valve of the thermostatic mode chamber is adjusted according to the first current valve step and the first compensation valve step.

[0110] The opening degree of the electronic expansion valve of the cooling mode compartment is adjusted according to the first current valve step and the first compensation valve step.

[0111] Optionally, the cooling process opening control unit is also used to: adjust the opening of the electronic expansion valve of the constant temperature mode chamber according to the sum of the first current valve step and the first compensation valve step of the electronic expansion valve of the constant temperature mode chamber; and adjust the opening of the electronic expansion valve of the cooling mode chamber according to the sum of the first current valve step and the first compensation valve step of the electronic expansion valve of the cooling mode chamber.

[0112] Optionally, the first preset compressor frequency is the linear frequency variation curve of the first preset compressor.

[0113] Optionally, the control module further includes: a temperature control unit for the constant temperature process after cooling, used to control the compressor frequency reduction according to the second preset compressor frequency during the constant temperature process after cooling, and at the same time control the opening of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber according to the second preset compressor frequency.

[0114] Optionally, the temperature control unit for the isothermal process after cooling is also used to: obtain the second current valve step of the electronic expansion valve of the isothermal mode chamber and the second current valve step of the electronic expansion valve of the cooling mode chamber during the isothermal process after cooling.

[0115] The second preset multiple of the second preset compressor frequency is used as the second compensation valve step;

[0116] The opening degree of the electronic expansion valve of the thermostatic mode chamber is adjusted according to the second current valve step and the second compensation valve step.

[0117] The opening degree of the electronic expansion valve of the cooling mode compartment is adjusted according to the second current valve step and the second compensation valve step.

[0118] Optionally, the temperature control unit for the cooling and constant temperature process is also used to: adjust the opening of the electronic expansion valve of the constant temperature mode chamber according to the difference between the second current valve step and the second compensation valve step of the electronic expansion valve of the constant temperature mode chamber; and adjust the opening of the electronic expansion valve of the cooling mode chamber according to the difference between the second current valve step and the second compensation valve step of the electronic expansion valve of the cooling mode chamber.

[0119] Optionally, the second preset compressor frequency is the linear frequency variation curve of the second preset compressor.

[0120] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0121] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for controlling low pressure and temperature rebound in a refrigeration device, characterized in that, include: Obtain the current temperature of each room and determine the current temperature control mode of each room based on the current temperature of each room. When at least one compartment is in constant temperature mode and another compartment is in cooling mode, the cooling process of the refrigeration equipment is regulated according to the first preset compressor frequency, and the constant temperature process of the refrigeration equipment after cooling is regulated according to the second preset compressor frequency. The cooling process of the refrigeration equipment controlled according to the first preset compressor frequency includes: During the cooling process, the compressor frequency is increased according to the first preset compressor frequency, and the opening degree of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber is controlled according to the first preset compressor frequency. During the cooling process, controlling the opening degree of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber according to the first preset compressor frequency includes: During the cooling process, obtain the first current valve step of the electronic expansion valve of the constant temperature mode chamber and the first current valve step of the electronic expansion valve of the cooling mode chamber. The first preset multiple of the first preset compressor frequency is used as the first compensation valve step; The opening degree of the electronic expansion valve of the constant temperature mode chamber is adjusted according to the first current valve step and the first compensation valve step. The opening degree of the electronic expansion valve of the cooling mode compartment is adjusted according to the first current valve step and the first compensation valve step of the electronic expansion valve of the cooling mode compartment. The process of maintaining a constant temperature in the refrigeration equipment after cooling, according to the second preset compressor frequency, includes: During the constant temperature process after cooling, the compressor frequency is reduced according to the second preset compressor frequency, and the opening degree of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber is controlled according to the second preset compressor frequency.

2. The method for controlling low pressure and temperature rebound in refrigeration equipment according to claim 1, characterized in that, The step of adjusting the opening degree of the electronic expansion valve of the constant temperature mode chamber according to the first current valve step and the first compensation valve step includes: The opening degree of the electronic expansion valve of the constant temperature mode chamber is adjusted according to the sum of the first current valve step and the first compensation valve step. The step of adjusting the opening degree of the electronic expansion valve of the cooling mode compartment according to the first current valve step and the first compensation valve step includes: The opening degree of the electronic expansion valve of the cooling mode compartment is adjusted according to the sum of the first current valve step and the first compensation valve step.

3. The method for controlling low pressure and temperature rebound in refrigeration equipment according to claim 1, characterized in that, The first preset compressor frequency is the linear frequency variation curve of the first preset compressor.

4. The method for controlling low pressure and temperature rebound in refrigeration equipment according to claim 1, characterized in that, The process of maintaining a constant temperature after cooling, controlling the opening degree of the electronic expansion valves of the constant temperature mode chamber and the cooling mode chamber according to the second preset compressor frequency, includes: The second current valve step of the electronic expansion valve in the constant temperature mode chamber and the second current valve step of the electronic expansion valve in the cooling mode chamber are obtained during the constant temperature process after cooling. The second preset multiple of the second preset compressor frequency is used as the second compensation valve step; The opening degree of the electronic expansion valve of the constant temperature mode chamber is adjusted according to the second current valve step and the second compensation valve step of the electronic expansion valve of the constant temperature mode chamber. The opening degree of the electronic expansion valve of the cooling mode compartment is adjusted according to the second current valve step and the second compensation valve step.

5. The method for controlling low pressure and temperature rebound in refrigeration equipment according to claim 4, characterized in that, The step of adjusting the opening degree of the electronic expansion valve of the constant temperature mode chamber according to the second current valve step and the second compensation valve step includes: The opening degree of the electronic expansion valve of the constant temperature mode chamber is adjusted according to the difference between the second current valve step and the second compensation valve step of the electronic expansion valve of the constant temperature mode chamber. The step of adjusting the opening degree of the electronic expansion valve of the cooling mode compartment according to the second current valve step and the second compensation valve step includes: The opening degree of the electronic expansion valve of the cooling mode compartment is adjusted according to the difference between the second current valve step and the second compensation valve step of the electronic expansion valve of the cooling mode compartment.

6. The method for controlling low pressure and temperature rebound in refrigeration equipment according to claim 1, characterized in that, The second preset compressor frequency is the linear frequency variation curve of the second preset compressor.

7. A control device for preventing low pressure and temperature rebound in a refrigeration equipment, used to execute the control method for preventing low pressure and temperature rebound in a refrigeration equipment as described in any one of claims 1-6, characterized in that, include: The current temperature acquisition module is used to acquire the current temperature of each room; The current temperature control mode determination module is used to determine the current temperature control mode of each room based on the current temperature of each room. The control module is used to regulate the cooling process of the refrigeration equipment according to a first preset compressor frequency when at least one room is in constant temperature mode and another room is in cooling mode, and to regulate the constant temperature process of the refrigeration equipment after cooling according to a second preset compressor frequency.

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