Refrigeration system temperature adjustment method and device, and electronic device

Abstract

The application discloses a refrigeration system temperature adjusting method and device and electronic equipment. The method comprises the following steps: obtaining a preset temperature value of a target medium, and determining a preset opening of a throttling device of a refrigeration system corresponding to the preset temperature value; in the case that the opening of the throttling device is fixed as the preset opening, the opening of a first bypass valve of the refrigeration system is adjusted until the opening of the first bypass valve reaches a preset opening threshold value or the operating parameter of the refrigeration system does not satisfy a preset parameter threshold condition, and a first temperature upper limit value of the target medium and an opening upper and lower limit value of the first bypass valve are determined; and the opening of the first bypass valve is adjusted within a target opening range, so that the temperature of the target medium changes within a target temperature adjusting range. The application solves the technical problem that the existing refrigeration equipment does not have the ability to expand the refrigeration range of the equipment because the bypass electromagnetic valve of the refrigeration equipment in the related art is only designed to consume excess refrigeration capacity.

Description

Technical Field

[0001] This application relates to the field of temperature control technology, and more specifically, to a method, apparatus, and electronic device for regulating the temperature of a refrigeration system. Background Technology

[0002] In order to ensure stable operation under low load, most refrigeration equipment in related technologies adds a bypass circuit to regulate the flow path of refrigerant in the pipeline. When the external cooling demand does not meet the minimum operating requirements of the equipment, the cooling capacity of the refrigeration system is regulated by opening valves such as solenoid valves or electronic expansion valves on the bypass pipeline.

[0003] However, the bypass solenoid valves in related technologies are only designed to consume excess cooling capacity or prevent low-pressure protection of the system under low-load conditions. They do not have the ability to expand the cooling range of the equipment, nor do they achieve the function of precise temperature control.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This application provides a method, apparatus, and electronic device for regulating the temperature of a refrigeration system, which at least solves the technical problem that existing refrigeration equipment does not have the ability to expand its refrigeration range because the bypass solenoid valve of the refrigeration equipment in the related art is only designed to consume excess refrigeration capacity.

[0006] According to one aspect of the embodiments of this application, a method for regulating the temperature of a refrigeration system is provided, wherein the refrigeration system is used to control the temperature of a target medium. The method includes: acquiring a preset temperature value of the target medium and determining a preset opening degree of a throttling device of the refrigeration system corresponding to the preset temperature value, wherein the throttling device is used to control the flow rate of refrigerant in the refrigeration system to regulate the temperature; when the opening degree of the throttling device is fixed at the preset opening degree, determining a first upper limit value of the target medium and upper and lower limits of the opening degree of the first bypass valve by adjusting the opening degree of the first bypass valve until the opening degree of the first bypass valve reaches a preset opening degree threshold or the operating parameters of the refrigeration system do not meet the preset parameter threshold conditions; and adjusting the opening degree of the first bypass valve within the target opening degree range to make the temperature of the target medium change within the target temperature regulation range, wherein the target opening degree range is determined by the upper and lower opening degree values, and the target temperature regulation range is determined by the lower lower temperature value and the upper temperature value.

[0007] Optionally, the preset temperature value includes: a first temperature value and a second temperature value; the preset opening threshold includes: a first opening threshold and a second opening threshold; and the preset parameter threshold condition includes: a first parameter threshold condition and a second parameter threshold condition. Determining the first upper limit of the target medium's temperature and the upper and lower limits of the first bypass valve's opening by adjusting the opening of the first bypass valve of the refrigeration system until the opening of the first bypass valve reaches the preset opening threshold or the operating parameters of the refrigeration system do not meet the preset parameter threshold condition includes: when the temperature of the target medium reaches the first temperature value and the opening of the throttling device is fixed at the first opening, adjusting the opening of the first bypass valve of the refrigeration system until the opening of the first bypass valve reaches the first opening threshold or the operating parameters of the refrigeration system... If the first parameter threshold condition is not met, determine the first upper limit value of the target medium temperature and the upper limit value of the opening of the first bypass valve, wherein the first opening is the preset opening of the throttling device when the temperature of the target medium reaches the first temperature value; if the temperature of the target medium reaches the second temperature value and the opening of the throttling device is fixed at the second opening, adjust the opening of the first bypass valve of the refrigeration system until the opening of the first bypass valve reaches the second opening threshold or the operating parameters of the refrigeration system do not meet the second parameter threshold condition, and determine the lower limit value of the opening of the first bypass valve, wherein the second temperature value is less than the first temperature value and not less than the first lower lower limit value, and the second opening is the preset opening of the throttling device when the temperature of the target medium reaches the second temperature value.

[0008] Optionally, the first temperature value is the initial upper limit of the refrigeration system, and the second temperature value is the lower limit of the first temperature.

[0009] Optionally, a first bypass valve is located on a first bypass pipeline and is used to mix a portion of the refrigerant discharged from the compressor with the refrigerant discharged from the throttling device before inputting it into the evaporator. Determining the first upper limit value of the target medium's temperature and the upper limit value of the first bypass valve's opening by adjusting the opening of the first bypass valve until the opening reaches a first opening threshold or the operating parameters of the refrigeration system do not meet the first parameter threshold condition includes: controlling the first bypass valve to open and close within the operating cycle based on the preset operating cycle duration and the target opening value, and recording the operating parameters of the refrigeration system within the operating cycle, wherein the target opening value is greater than a second opening threshold but not greater than the first opening threshold; when the operating parameters meet the first parameter threshold condition, increasing the target opening value by a preset opening increment, and re-controlling the first bypass valve to open and close based on the preset operating cycle duration and the target opening value after increasing the preset opening increment. The operating parameters of the refrigeration system are re-recorded until the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition. If the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition, it is determined whether a second bypass valve exists in the refrigeration system and its open / closed state. The second bypass valve is located on the second bypass pipeline and is used to mix part of the refrigerant discharged from the throttling device with the refrigerant discharged from the evaporator and input it into the compressor. If the second bypass valve does not exist in the refrigeration system or the second bypass valve is already open, the actual temperature of the target medium in the first cycle is determined as the first temperature upper limit value, and the target opening value corresponding to the first cycle is the opening upper limit value. The first cycle is the previous operating cycle immediately preceding the second cycle, and the second cycle is the operating cycle in which the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition.

[0010] Optionally, after determining whether a second bypass valve exists in the refrigeration system and its open / closed state, the process further includes: if a second bypass valve exists in the refrigeration system and is closed, opening the second bypass valve. After opening the second bypass valve, if the operating parameters that previously did not meet the first parameter threshold condition now meet the first parameter threshold condition, the target opening value is increased by a preset opening increment. The first bypass valve is then re-controlled to open and close based on the preset operating cycle duration and the target opening value after the preset opening increment. The operating parameters of the refrigeration system are then re-recorded until the target opening value reaches the first opening threshold or the operating parameters no longer meet the first parameter threshold condition. The actual temperature of the target medium in the first cycle is then determined as the first upper temperature limit, and the target opening value corresponding to the first cycle is the upper opening limit. If the operating parameters that previously did not meet the first parameter threshold condition still do not meet the first parameter threshold condition, the actual temperature of the target medium in the first cycle is then determined as the first upper temperature limit, and the target opening value corresponding to the first cycle is the upper opening limit.

[0011] Optionally, determining the lower limit of the opening of the first bypass valve by adjusting the opening of the first bypass valve until the opening of the first bypass valve reaches a second opening threshold or the operating parameters of the refrigeration system do not meet the second parameter threshold condition includes: determining the preset operating cycle duration and the preset target opening value of the first bypass valve, wherein the initially preset target opening value is greater than the second opening threshold and not greater than the first opening threshold; controlling the first bypass valve to open and close within the operating cycle according to the preset operating cycle duration and the target opening value of the first bypass valve, and recording the operating parameters of the refrigeration system within the operating cycle; and, if the operating parameters meet the second parameter threshold condition, setting the target opening lower limit. The opening value is reduced by a preset opening increment, and the first bypass valve is re-controlled to open and close based on the preset operating cycle duration and the target opening value after reducing the preset opening increment. The operating parameters of the refrigeration system are re-recorded until the target opening value reaches the second opening threshold or the operating parameters do not meet the second parameter threshold condition. If the target opening value reaches the second opening threshold or the operating parameters do not meet the second parameter threshold condition, the target opening value corresponding to the third cycle is determined to be the lower limit of the opening value. The third cycle is the previous operating cycle immediately preceding the fourth cycle, and the fourth cycle is the operating cycle in which the target opening value reaches the second opening threshold or the operating parameters do not meet the second parameter threshold condition.

[0012] Optionally, controlling the opening and closing of the first bypass valve within an operating cycle includes: determining the preset operating cycle duration and the preset target opening value of the first bypass valve; calculating the closing time and disconnection time of the first bypass valve within one operating cycle based on the preset operating cycle duration and the target opening value; and controlling the first bypass valve to close and disconnect based on the closing time and disconnection time, wherein the first bypass valve is in an open state when it is closed and in a closed state when it is disconnected.

[0013] Optionally, the operating parameters are used to characterize the working state of the refrigeration system. The operating parameters include: actual suction pressure, actual discharge pressure, actual suction temperature, actual discharge temperature, compressor operating current, and compressor superheat. The first parameter threshold conditions include: suction pressure threshold, discharge pressure threshold, suction temperature threshold, discharge temperature threshold, and compressor operating current threshold. The second parameter threshold conditions include: suction pressure threshold, discharge pressure threshold, suction temperature threshold, discharge temperature threshold, compressor operating current threshold, and compressor superheat threshold.

[0014] Optionally, adjusting the opening of the first bypass valve within the target opening range to make the temperature of the target medium change within the target temperature adjustment range includes: when the target set temperature is within the range determined by the second temperature value and the first temperature value, closing the first bypass valve and adjusting the opening of the throttling device to make the actual temperature of the target medium in the refrigeration system reach the target set temperature, wherein the target set temperature is the temperature that the target medium in the refrigeration system is planned to reach; when the target set temperature is within the range determined by the first temperature value and the first upper temperature value, setting the opening of the throttling device to the first opening and maintaining it for a preset time to make the refrigeration system operating state stable; adjusting the opening of the throttling device to the second opening and adjusting the opening of the first bypass valve to make the actual temperature in the refrigeration system reach the target set temperature, wherein the second opening is less than the first opening, and the adjustment range of the opening of the first bypass valve is the target opening range.

[0015] According to one aspect of the embodiments of this application, a method for regulating the temperature of a refrigeration system is also provided, comprising: determining a temperature range within a target temperature regulation range where a target set temperature is located, wherein the target set temperature is a temperature to be reached by a target medium in the refrigeration system, and the target temperature regulation range is determined by a first lower temperature limit and a first upper temperature limit, wherein the first upper temperature limit is determined by adjusting the opening of a first bypass valve of the refrigeration system until the opening of the first bypass valve reaches a first opening threshold or the operating parameters of the refrigeration system do not meet the first parameter threshold condition; determining a temperature regulation method based on the temperature range, and adjusting the opening of the first bypass valve within the target opening range according to the temperature regulation method, so that the temperature in the refrigeration system reaches the target set temperature, wherein the target opening range is determined by an upper opening limit and a lower opening limit.

[0016] Optionally, adjusting the opening of the first bypass valve within the target opening range according to the temperature regulation method corresponding to the temperature range includes: when the target set temperature is within the range determined by the first lower limit and the first temperature value, closing the first bypass valve and adjusting the opening of the throttling device to make the actual temperature in the refrigeration system reach the target set temperature, wherein the first temperature value is greater than the first lower limit and less than the first upper limit, the throttling device is used to control the flow rate of refrigerant in the refrigeration system to regulate the temperature, and the first bypass valve is located on the first bypass pipeline to mix part of the refrigerant discharged from the compressor with the refrigerant discharged from the throttling device and input it into the evaporator. When the target set temperature is within the range determined by the first temperature value and the first upper temperature value, the opening degree of the throttling device is set to the first preset opening degree and maintained for a preset duration to stabilize the operation of the refrigeration system. The first preset opening degree is the opening degree of the throttling device when the actual temperature of the target medium in the refrigeration system reaches the preset temperature, and the preset temperature includes the first temperature value. The opening degree of the throttling device is adjusted to the second preset opening degree, and the opening degree of the first bypass valve is adjusted to make the actual temperature of the target medium reach the target set temperature. The second preset opening degree is less than the first preset opening degree, and the adjustment range of the opening degree of the first bypass valve is the target opening degree range.

[0017] According to another aspect of the embodiments of this application, a refrigeration system temperature regulation device is also provided, comprising: an opening degree determination module, configured to acquire a preset temperature value of a target medium and determine a preset opening degree of a throttling device of the refrigeration system corresponding to the preset temperature value, wherein the throttling device is used to control the flow rate of refrigerant in the refrigeration system to regulate the temperature; an upper and lower limit determination module, configured to, when the opening degree of the throttling device is fixed at a preset opening degree, determine a first upper limit value of the target medium and an upper and lower limit value of the opening degree of the first bypass valve by adjusting the opening degree of the first bypass valve until the opening degree of the first bypass valve reaches a preset opening degree threshold or the operating parameters of the refrigeration system do not meet the preset parameter threshold conditions; and a temperature regulation module, configured to adjust the opening degree of the first bypass valve within a target opening degree range so that the temperature of the target medium changes within a target temperature regulation range, wherein the target opening degree range is determined by the upper and lower opening degree values, and the target temperature regulation range is determined by the lower lower temperature value and the upper temperature value.

[0018] According to another aspect of the embodiments of this application, an electronic device is also provided, including: a memory and a processor, the processor being configured to run a program stored in the memory, wherein the program executes a cooling system temperature regulation method during runtime.

[0019] According to another aspect of the embodiments of this application, a non-volatile storage medium is also provided, the non-volatile storage medium including a stored computer program, wherein the device containing the non-volatile storage medium executes a cooling system temperature regulation method by running the computer program.

[0020] In this embodiment, a preset temperature value of the target medium is obtained, and a preset opening degree of the throttling device of the refrigeration system corresponding to the preset temperature value is determined. The throttling device is used to control the flow rate of refrigerant in the refrigeration system to regulate the temperature. With the opening degree of the throttling device fixed at the preset opening degree, the opening degree of the first bypass valve of the refrigeration system is adjusted until the opening degree of the first bypass valve reaches a preset opening degree threshold or the operating parameters of the refrigeration system do not meet the preset parameter threshold conditions. This determines the first upper limit value of the target medium's temperature and the upper and lower limits of the first bypass valve's opening degree. The opening degree of the first bypass valve is adjusted within the target opening degree range to ensure the target medium's temperature is within the preset threshold range. The temperature of the target medium varies within the target temperature regulation range. The target opening range is determined by the upper and lower opening limits, and the target temperature regulation range is determined by the lower and upper temperature limits. Through experimental testing, the allowable upper limit of temperature control and the upper and lower limits of the bypass solenoid valve opening are determined. This achieves the goal of safely expanding the temperature control range of the refrigeration equipment and setting the temperature control accuracy of the equipment. In turn, it solves the technical problem that the bypass solenoid valve of the refrigeration equipment in related technologies is only designed to consume excess refrigeration capacity, which causes the existing refrigeration equipment to lack the ability to expand the refrigeration range. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a hardware structure block diagram of a computer terminal (or electronic device) for implementing a method for temperature regulation of a refrigeration system, according to an embodiment of this application.

[0023] Figure 2 This is a schematic diagram of a method for temperature regulation of a refrigeration system according to an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of a refrigeration system according to an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of a method for determining a first upper limit value of the temperature of a target medium and an upper limit value of the opening degree of a first bypass valve according to an embodiment of this application;

[0026] Figure 5 This is a schematic diagram of a method for setting the upper limit of temperature control increase and the upper limit of opening of bypass solenoid valve 1 in a test device according to an embodiment of this application;

[0027] Figure 6This is a schematic diagram of a method for determining the lower limit value of the opening of a first bypass valve according to an embodiment of this application;

[0028] Figure 7 This is a schematic diagram of a method for testing the lower limit of the opening of a solenoid valve 1 according to an embodiment of this application;

[0029] Figure 8 This is a schematic diagram of a method for adjusting the opening of a first bypass valve to change the temperature of a target medium within a target temperature adjustment range, according to an embodiment of this application.

[0030] Figure 9 This is a schematic diagram of a method flow for executing the control mode switching logic of a bypass solenoid valve 1 according to an embodiment of this application;

[0031] Figure 10 This is a schematic diagram of the overall software workflow of a refrigeration system temperature regulation method provided according to an embodiment of this application;

[0032] Figure 11 This is a schematic diagram of a protection parameter calibration method provided according to an embodiment of this application;

[0033] Figure 12 This is a schematic diagram of another method for temperature regulation of a refrigeration system according to an embodiment of this application;

[0034] Figure 13 This is a schematic diagram of a temperature regulating device for a refrigeration system provided according to an embodiment of this application. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application 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 this application 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.

[0037] In related technologies, bypass solenoid valves in refrigeration equipment are designed only to consume excess cooling capacity or prevent system low-pressure protection under low-load conditions. They do not have the ability to expand the cooling range of the equipment, nor do they achieve precise temperature control. To address this issue, this application provides a related solution, which is detailed below.

[0038] According to an embodiment of this application, a method for regulating the temperature of a refrigeration system is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0039] The method embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Figure 1 A hardware block diagram of a computer terminal (or electronic device) for implementing a temperature regulation method for a refrigeration system is shown. Figure 1 As shown, the computer terminal 10 (or electronic device 10) may include one or more processors 102 (shown as 102a, 102b, ..., 102n in the figure) 102 (processor 102 may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.), a memory 104 for storing data, and a transmission device 106 for communication functions. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of a BUS bus), a network interface, a power supply, and / or a camera. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned electronic device. For example, computer terminal 10 may also include... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0040] It should be noted that the aforementioned one or more processors 102 and / or other data processing circuits are generally referred to herein as "data processing circuits". These data processing circuits may be embodied, in whole or in part, in software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuits may be a single, independent processing module, or may be integrated, in whole or in part, into any other element within the computer terminal 10 (or electronic device). As involved in the embodiments of this application, the data processing circuits serve as a processor control mechanism (e.g., selection of a variable resistor termination path connected to an interface).

[0041] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the refrigeration system temperature regulation method in this embodiment. The processor 102 executes various functional applications and data processing by running the software programs and modules stored in the memory 104, thereby realizing the above-mentioned refrigeration system temperature regulation method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the computer terminal 10 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0042] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the communication provider of the computer terminal 10. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0043] The display may be, for example, a touchscreen liquid crystal display (LCD) that allows the user to interact with the user interface of the computer terminal 10 (or electronic device).

[0044] Under the aforementioned operating environment, embodiments of this application provide a method for regulating the temperature of a refrigeration system. This method is used to adjust the temperature control range and accuracy of refrigeration equipment or systems. Figure 3 This is a schematic diagram of a refrigeration system according to an embodiment of this application, such as... Figure 3 As shown.

[0045] In the diagram, component number 1 is the compressor, component number 2 is the condenser, component number 3 is the throttling device (in this embodiment, the throttling device is an expansion valve, or a series solenoid valve and capillary tube), component number 4 is the evaporator, component number 5 is the evaporation temperature sensor, component number 6 is the suction pressure sensor, component number 7 is the discharge temperature sensor, component number 8 is the discharge pressure sensor, component number 9 is the bypass solenoid valve 1, component number 10 is the bypass solenoid valve 2, component number 11 is the temperature control and detection sensor, and component number 12 is the medium being cooled (target medium).

[0046] Current refrigeration equipment all contain at least Figure 3 The piping of the bypass solenoid valve 1, numbered 9, shown in the diagram, mostly also includes... Figure 3 The piping for bypass solenoid valve 2, numbered 10, is shown in the diagram. The refrigeration system temperature regulation method provided in this application can be used for... Figure 3 The refrigeration system shown regulates the temperature. Figure 2 This is a schematic diagram of a method for temperature regulation of a refrigeration system according to an embodiment of this application, as shown below. Figure 2 As shown, the method includes the following steps:

[0047] Step S202: Obtain the preset temperature value of the target medium and determine the preset opening degree of the throttling device of the refrigeration system corresponding to the preset temperature value, wherein the throttling device is used to control the flow rate of refrigerant in the refrigeration system to adjust the temperature.

[0048] In the technical solution provided in step S202, the preset temperature value is the current temperature value of the target medium, and the preset opening value is the opening degree of the throttling device when the refrigeration system maintains the target medium at the current temperature value. In this embodiment, the preset temperature value includes a first temperature value and a second temperature value, and the preset opening degree includes a first opening degree and a second opening degree.

[0049] The first temperature value is preferably the upper limit of the initial temperature set by the refrigeration system, and the second temperature value is preferably the lower limit of the first temperature. In this embodiment, the temperature adjustment range T∈[a,b]℃ of the refrigeration equipment (system) and a (i.e., the lower limit of the first temperature)≤b (i.e., the upper limit of the initial temperature) are used as an example for explanation.

[0050] Specifically, the target temperature of the equipment is set to b℃ (i.e., the aforementioned initial upper limit temperature). After the unit operates to the target set value and confirms that the temperature meets the design accuracy range of the equipment for a preset time (e.g., 30 minutes), the current opening degree C1% of the throttling device (expansion valve) (i.e., the aforementioned first opening degree) is recorded. And,

[0051] Set the target temperature of the equipment to a℃ (i.e., the first lower limit of the temperature). After the unit runs to the target set value and confirms that the temperature meets the accuracy range designed for the equipment for a preset time (e.g., 30 minutes), record the current opening degree C2% of the throttling device (expansion valve) (i.e., the second opening degree mentioned above).

[0052] Step S204: When the opening degree of the throttling device is fixed at the preset opening degree, the opening degree of the first bypass valve of the refrigeration system is adjusted until the opening degree of the first bypass valve reaches the preset opening degree threshold or the operating parameters of the refrigeration system do not meet the preset parameter threshold conditions, and the first upper limit value of the target medium and the upper and lower limits of the opening degree of the first bypass valve are determined.

[0053] In the technical solution provided in step S204, the preset opening threshold includes: a first opening threshold and a second opening threshold, and the preset parameter threshold condition includes: a first parameter threshold condition and a second parameter threshold condition, wherein the first opening threshold represents that the valve is fully open, that is, the opening degree is 1, and the second opening threshold represents that the valve is fully closed, that is, the opening degree is 0.

[0054] In some embodiments of this application, determining the first upper limit of the target medium temperature and the upper and lower limits of the first bypass valve opening by adjusting the opening degree of the first bypass valve until the opening degree of the first bypass valve reaches a preset opening threshold or the operating parameters of the refrigeration system do not meet the preset parameter threshold conditions includes the following steps:

[0055] 1) When the opening degree of the throttling device is fixed at the first opening degree, the opening degree of the first bypass valve of the refrigeration system is adjusted until the opening degree of the first bypass valve reaches the first opening degree threshold or the operating parameters of the refrigeration system do not meet the first parameter threshold condition, and the first temperature upper limit value of the target medium and the opening upper limit value of the first bypass valve are determined. Wherein, the first opening degree is the preset opening degree of the throttling device when the temperature of the target medium reaches the first temperature value.

[0056] Figure 4 This is a schematic diagram of a method for determining a first upper limit value of the target medium's temperature and an upper limit value of the opening degree of a first bypass valve, according to an embodiment of this application. Figure 4 As shown, determining the first upper limit of the target medium's temperature and the upper limit of the first bypass valve's opening by adjusting the opening degree of the first bypass valve until the opening degree of the first bypass valve reaches the first opening threshold or the operating parameters of the refrigeration system do not meet the first parameter threshold condition includes the following steps:

[0057] Step S402: Based on the preset operating cycle duration and target opening value of the first bypass valve, control the first bypass valve to open and close within the operating cycle, and record the operating parameters of the refrigeration system within the operating cycle. The target opening value is greater than the second opening threshold and not greater than the first opening threshold. The first bypass valve is located on the first bypass pipeline and is used to mix part of the refrigerant discharged from the compressor with the refrigerant discharged from the throttling device and input it into the evaporator. In this embodiment, one end of the first bypass pipeline is connected to the compressor output end, and the other end of the first bypass pipeline is connected to the evaporator input end.

[0058] Specifically, the operating cycle time t (i.e., the preset operating cycle duration) of the bypass solenoid valve 1 (i.e., the first bypass valve mentioned above) is set, and the initial opening degree of the bypass solenoid valve 1 is E% (0 < E ≤ 1) (i.e., the target opening degree value mentioned above); the closing time of the bypass solenoid valve 1 is txh = E% * t, the disconnection time is tfd = t – txh, the throttling device (expansion valve) is set to manual mode, and the fixed opening degree is C1% (i.e., the first opening degree mentioned above); the controller controls the closing of the bypass solenoid valve 1 according to the txh time interval, records the actual temperature detection temperature Tsj of the equipment, and monitors the operating parameters of the whole machine.

[0059] In some embodiments of this application, the operating parameters include: actual intake pressure P1sj, actual exhaust pressure P2sj, actual intake temperature T1sj, actual exhaust temperature T2sj, and compressor operating current I1sj.

[0060] Step S404: If the operating parameters meet the first parameter threshold condition, the target opening value is increased by a preset opening increment, and the first bypass valve is re-controlled to open and close according to the preset operating cycle duration and the target opening value after the preset opening increment is increased. The operating parameters of the refrigeration system are re-recorded until the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition.

[0061] In some embodiments of this application, the first parameter threshold conditions include: intake pressure threshold P1max, exhaust pressure threshold P2max, intake temperature threshold T1max, exhaust temperature threshold T2max, and compressor operating current threshold I1max.

[0062] Specifically, when the operating parameters meet the first parameter threshold condition, i.e., the actual suction pressure P1sj < P1max, the actual discharge pressure P2sj < P2max, the actual suction temperature T1sj < T1max, the actual discharge temperature T2sj < T2max, and the compressor operating current I1sj < I1max, the target opening value of the first bypass valve is increased by a preset opening increment (e.g., 3%) every preset time (e.g., 20 minutes) until E% = 1 (i.e., the above target opening value reaches the first opening threshold) or any of the first parameter threshold conditions is not met.

[0063] Step S406: If the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition, determine whether there is a second bypass valve in the refrigeration system and the opening and closing state of the second bypass valve. The second bypass valve is located on the second bypass pipeline and is used to mix part of the refrigerant discharged from the throttling device with the refrigerant discharged from the evaporator and input it into the compressor. In this embodiment, one end of the second bypass pipeline is connected to the output end of the throttling device, and the other end of the second bypass pipeline is connected to the input end of the compressor.

[0064] Step S408: If there is no second bypass valve in the refrigeration system or the second bypass valve is already open, determine the actual temperature of the target medium in the first cycle as the first temperature upper limit value, and the target opening value corresponding to the first cycle as the opening upper limit value. Here, the first cycle is the previous operating cycle immediately preceding the second cycle, and the second cycle is the operating cycle in which the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition.

[0065] Specifically, if there is no branch bypass solenoid valve 2 (i.e., the second bypass valve mentioned above) in the refrigeration system or the branch bypass solenoid valve 2 has been opened, record the actual temperature detection temperature Tsj of the equipment in the previous cycle (i.e., the first cycle mentioned above). Use this temperature as the set value of the upper limit of temperature control adjustment Tsx (i.e., the first upper limit of temperature mentioned above) and the opening degree Emax% of the bypass solenoid valve 1 (i.e., the upper limit of opening degree mentioned above). Then, the maximum temperature control adjustment range of this refrigeration equipment (system) can be determined to be T∈[a,Tsx]℃, a≤b≤Tsx, and the maximum opening degree Emax% of the bypass solenoid valve 1.

[0066] When a second bypass solenoid valve is present in the refrigeration system, the temperature regulation range can be further improved. Specifically, after determining whether a second bypass valve exists in the refrigeration system and its open / closed state, the following steps are also included: If a second bypass valve exists in the refrigeration system and is closed, the second bypass valve is opened. After opening the second bypass valve, if the operating parameters that did not meet the first parameter threshold condition originally meet the first parameter threshold condition again, the target opening value is increased by a preset opening increment. The first bypass valve is then controlled to open and close again based on the preset operating cycle duration and the target opening value after the preset opening increment. The operating parameters of the refrigeration system are then recorded again until the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition. The actual temperature of the target medium in the first cycle is determined as the first temperature upper limit value, and the target opening value corresponding to the first cycle is the opening upper limit value. If the operating parameters that did not meet the first parameter threshold condition originally still do not meet the first parameter threshold condition, the actual temperature of the target medium in the first cycle is determined as the first temperature upper limit value, and the target opening value corresponding to the first cycle is the opening upper limit value.

[0067] The method for determining the first upper limit of the target medium temperature and the upper limit of the opening of the first bypass valve in steps S402 to S408 will be further described below.

[0068] Figure 5 This is a schematic diagram of a method flow for setting the upper limit of temperature control rise and the upper limit of opening of bypass solenoid valve 1 in a testing device according to an embodiment of this application. Figure 5 As shown, the method includes the following steps:

[0069] Step 502: Set the operating cycle time t (i.e. the preset operating cycle) of the bypass solenoid valve 1 (i.e. the first bypass valve mentioned above) and the initial opening degree E% (i.e. the target opening degree value) of the bypass solenoid valve 1 (i.e. the first bypass valve mentioned above) (0 < E ≤ 1).

[0070] Step 504: Based on the operating cycle time t (i.e. the preset operating cycle duration) and the target opening value E%, determine the bypass solenoid valve 1's pull-in time txh = E*t, the disconnection time tfd = t – txh, and set the throttling device (expansion valve) to manual mode, fixing the opening value to C1% (i.e. the first opening value).

[0071] In some embodiments of this application, controlling the opening and closing of the first bypass valve within an operating cycle includes the following steps: determining the preset operating cycle duration and the preset target opening value of the first bypass valve; calculating the closing time and disconnection time of the first bypass valve within one operating cycle based on the preset operating cycle duration and the target opening value; controlling the first bypass valve to close and disconnect based on the closing time and disconnection time, wherein the first bypass valve is in an open state when it is closed and in a closed state when it is disconnected.

[0072] Step 506: The controller controls the bypass solenoid valve 1 to engage according to the txh time interval, records the actual temperature Tsj of the equipment, and monitors whether the whole machine meets the first parameter threshold conditions: actual suction pressure P1sj < P1max, actual discharge pressure P2sj < P2max, actual suction temperature T1sj < T1max, actual discharge temperature T2sj < T2max, and compressor operating current I1sj < I1max.

[0073] Step 508: If the first parameter threshold condition in step 506 is met, the opening degree of the solenoid valve is increased by a preset opening degree increment (e.g., 3%) every preset time (e.g., 20 min) until E% = 1 (i.e., the above target opening degree value reaches the first opening threshold) or any of the first parameter threshold conditions is not met.

[0074] Step 510: If the system has a branch bypass solenoid valve 2 (i.e., the second bypass valve mentioned above), determine the opening and closing status of the branch bypass solenoid valve 2 (i.e., the second bypass valve mentioned above); if the branch bypass solenoid valve 2 is not open, then immediately open the branch bypass solenoid valve 2, delay for a preset time (e.g., 2 minutes), and continue to execute step 508 until E% = 1 (i.e., the target opening value mentioned above reaches the first opening threshold) or any of the first parameter threshold conditions is not met, then execute step 512; if the branch bypass solenoid valve 2 is already open or does not exist, then directly execute step 512.

[0075] Step 512: Record the actual temperature Tsj of the equipment in the previous cycle (i.e., the first cycle mentioned above). Use this temperature as the set value of the upper limit of temperature control adjustment Tsx (i.e., the first upper limit of temperature mentioned above) and the opening degree Emax% of the bypass solenoid valve 1 (i.e., the upper limit of opening degree mentioned above). Then, the maximum temperature control adjustment range of this refrigeration equipment (system) can be determined to be T∈[a,Tsx]℃, a≤b≤Tsx, and the maximum opening degree Emax% of the bypass solenoid valve 1.

[0076] 2) When the temperature of the target medium reaches the second temperature value and the opening degree of the throttling device is fixed at the second opening degree, the opening degree of the first bypass valve of the refrigeration system is adjusted until the opening degree of the first bypass valve reaches the second opening degree threshold or the operating parameters of the refrigeration system do not meet the second parameter threshold condition, and the lower limit value of the opening degree of the first bypass valve is determined. The second temperature value is less than the first temperature value and not less than the lower limit value of the first lower temperature value. The second opening degree is the preset opening degree of the throttling device when the temperature of the target medium reaches the second temperature value.

[0077] In some embodiments of this application, the second temperature value is preferably the lower limit of the first temperature, i.e., a℃.

[0078] Specifically, the target temperature of the equipment is set to a℃ (i.e., the lower limit of the first temperature mentioned above). After the unit runs to the target set value and the temperature is confirmed to be within the accuracy range and preset time (e.g., 30 min) of the equipment design, the following method for determining the lower limit of the opening of the first bypass valve is executed.

[0079] Figure 6 This is a schematic diagram of a method for determining the lower limit value of the opening of a first bypass valve according to an embodiment of this application, as shown below. Figure 6 As shown, determining the lower limit of the opening of the first bypass valve by adjusting the opening degree of the first bypass valve until the opening degree of the first bypass valve reaches the second opening degree threshold or the operating parameters of the refrigeration system do not meet the second parameter threshold condition includes the following steps:

[0080] Step S602: Determine the preset operating cycle duration and preset target opening value of the first bypass valve, wherein the initially preset target opening value is greater than the second opening threshold and not greater than the first opening threshold.

[0081] In some embodiments of this application, the preset target opening value is preferably a first opening threshold, i.e., the preset target opening value E% = 1.

[0082] Specifically, the operating cycle time t (i.e. the preset operating cycle duration) of the bypass solenoid valve 1 (i.e. the first bypass valve mentioned above) is set, and the initial opening degree E% of the bypass solenoid valve 1 is 1 (i.e. the preset target opening degree value mentioned above).

[0083] Step S604: Based on the preset operating cycle duration and target opening value of the first bypass valve, control the first bypass valve to open and close within the operating cycle, and record the operating parameters of the refrigeration system within the operating cycle.

[0084] In some embodiments of this application, controlling the opening and closing of the first bypass valve within an operating cycle includes the following steps: determining the preset operating cycle duration and the preset target opening value of the first bypass valve; calculating the closing time and disconnection time of the first bypass valve within one operating cycle based on the preset operating cycle duration and the target opening value; controlling the first bypass valve to close and disconnect based on the closing time and disconnection time, wherein the first bypass valve is in an open state when it is closed and in a closed state when it is disconnected.

[0085] Specifically, the bypass solenoid valve 1 has an engagement time txh = E*t, an interruption time tfd = t – txh, and the throttling device (expansion valve) is set to manual mode with a fixed opening degree of C2% (i.e., the second opening degree mentioned above).

[0086] Step S606: If the operating parameters meet the second parameter threshold condition, the target opening value is reduced by a preset opening increment, and the first bypass valve is re-controlled to open and close according to the preset operating cycle duration and the target opening value after reducing the preset opening increment. The operating parameters of the refrigeration system are re-recorded until the target opening value reaches the second opening threshold or the operating parameters do not meet the second parameter threshold condition.

[0087] To prevent the opening degree E% (i.e. the target opening value) of the bypass solenoid valve 1 (i.e. the first bypass valve mentioned above) from continuously decreasing, which would reduce the flow rate of superheated refrigerant entering the compressor through the bypass solenoid valve 1 pipeline, leading to a decrease in refrigerant heat exchange and causing liquid slugging in the compressor, it is necessary to monitor the evaporation heat exchange of the refrigerant before it enters the compressor, i.e., monitor the suction superheat of the compressor.

[0088] In some embodiments of this application, operating parameters are used to characterize the working state of the refrigeration system. The operating parameters include: actual suction pressure P1sj, actual discharge pressure P2sj, actual suction temperature T1sj, actual discharge temperature T2sj, compressor operating current I1sj, and compressor superheat. The compressor superheat can be selected as suction superheat or discharge superheat. Suction superheat can be calculated based on evaporation temperature Tzf and actual suction temperature T1sj, and discharge superheat can be calculated based on evaporation temperature Tzf and actual discharge temperature T2sj. In the embodiments of this application, suction superheat is preferred.

[0089] The second parameter threshold conditions mentioned above include: intake pressure threshold P1max, exhaust pressure threshold P2max, intake temperature threshold T1max, exhaust temperature threshold T2max, compressor operating current threshold I1max, and compressor superheat threshold Tgrd.

[0090] Specifically, if the second parameter threshold condition is met, the opening degree of the solenoid valve is reduced by a preset opening degree increment (e.g., 3%) every preset time period (e.g., 20 minutes) until E=0 (i.e., the above target opening degree value reaches the second opening degree threshold) or any of the second parameter threshold conditions is not met.

[0091] Step S608: If the target opening value reaches the second opening threshold or the operating parameters do not meet the second parameter threshold condition, determine the target opening value corresponding to the third cycle as the lower limit value of the opening. The third cycle is the previous operating cycle immediately preceding the fourth cycle, and the fourth cycle is the operating cycle in which the target opening value reaches the second opening threshold or the operating parameters do not meet the second parameter threshold condition.

[0092] Specifically, by recording the opening degree Emin% of the bypass solenoid valve 1 (i.e., the first bypass valve) in the previous cycle (i.e., the third cycle mentioned above), the minimum opening degree Emin% of the bypass solenoid valve 1 of this equipment (i.e., the lower limit of the opening degree) can be determined.

[0093] The method for determining the lower limit of the opening of the first bypass valve in steps S602 to S608 will be further described below.

[0094] Figure 7 This is a schematic diagram of a method for testing the lower limit of the opening of a solenoid valve 1 according to an embodiment of this application. Figure 7 As shown, the method includes the following steps:

[0095] Step S702: Set the operating cycle time t (i.e. the preset operating cycle duration) of the bypass solenoid valve 1 (i.e. the first bypass valve mentioned above), and set the initial opening degree E% of the bypass solenoid valve 1 to 1 (i.e. the preset target opening degree value mentioned above).

[0096] Step S704: Determine the closing time txh = E*t of the bypass solenoid valve 1, the disconnection time tfd = t – txh, and set the throttling device (expansion valve) to manual mode with a fixed opening degree of C2% (i.e., the second opening degree mentioned above).

[0097] Step S706: The controller controls the bypass solenoid valve 1 to engage according to txh, detects the actual suction pressure of the equipment, calculates the corresponding evaporation temperature Tzf based on this pressure, and records the actual suction temperature.

[0098] Determine whether the operating parameters meet the threshold conditions of the second parameter: actual suction pressure P1sj < P1max, actual discharge pressure P2sj < P2max, actual suction temperature T1sj < T1max, actual discharge temperature T2sj < T2max, compressor operating current I1sj < I1max, evaporation temperature Tzf - actual suction temperature T1sj (i.e., the suction superheat of the above compressor) > minimum suction superheat value Tgrd (i.e., the superheat threshold of the above compressor).

[0099] Step S708: If the second parameter threshold condition is met, the opening degree of the solenoid valve is reduced by a preset opening degree increment (e.g., 3%) every preset time period (e.g., 20 min) until E = 0 (i.e., the above target opening degree value reaches the second opening degree threshold) or any of the second parameter threshold conditions is not met.

[0100] Record the opening degree Emin% of the bypass solenoid valve 1 (i.e. the first bypass valve) in the previous cycle (i.e. the third cycle mentioned above), and the minimum opening degree Emin% of the bypass solenoid valve 1 of this equipment (i.e. the lower limit of the opening value mentioned above) can be determined.

[0101] Step S206: Adjust the opening of the first bypass valve within the target opening range so that the temperature of the target medium varies within the target temperature adjustment range. The target opening range is determined by the upper limit and lower limit of the opening, and the target temperature adjustment range is determined by the lower limit of the first lower temperature and the upper limit of the first temperature.

[0102] Figure 8 This is a schematic diagram of a method for adjusting the opening of a first bypass valve to change the temperature of a target medium within a target temperature adjustment range, according to an embodiment of this application. Figure 8 As shown, adjusting the opening of the first bypass valve within the target opening range to make the temperature of the target medium vary within the target temperature regulation range includes the following steps:

[0103] Step S802: When the target set temperature is within the range determined by the second temperature value and the first temperature value, close the first bypass valve and adjust the opening of the throttling device so that the actual temperature of the target medium in the refrigeration system reaches the target set temperature, wherein the target set temperature is the temperature that the target medium in the refrigeration system is planned to reach.

[0104] Specifically, when the target set temperature Tmb satisfies a (i.e. the second temperature value mentioned above) < Tmb ≤ b (i.e. the first temperature value mentioned above), the bypass solenoid valve 1 (i.e. the first bypass valve mentioned above) is closed, and the original throttling device (expansion valve) control PID logic is maintained.

[0105] Step S804: When the target set temperature is within the range determined by the first temperature value and the first upper temperature value, the opening degree of the throttling device is set to the first opening degree and maintained for a preset time to stabilize the operation of the refrigeration system.

[0106] Specifically, when the target set temperature Tmb satisfies b (i.e. the first temperature value mentioned above) < Tmb ≤ Tsx (i.e. the upper limit of the first temperature value mentioned above), the opening of the throttling device (expansion valve) is fixed at C1% (i.e. the first opening mentioned above) for a preset duration (e.g., 10 minutes).

[0107] Step S806: Adjust the opening degree of the throttling device to the second opening degree, and adjust the opening degree of the first bypass valve to make the actual temperature in the refrigeration system reach the target set temperature. The second opening degree is less than the first opening degree, and the adjustment range of the opening degree of the first bypass valve is the target opening degree range.

[0108] Specifically, the fixed opening of the throttling device (expansion valve) is adjusted to C2% (i.e., the second opening mentioned above), and the closing time of the bypass solenoid valve 1 (i.e., the first bypass valve mentioned above) is controlled by a PID controller, wherein the upper limit of the PID calculation value is E max% (i.e., the upper limit of the opening value mentioned above), and the lower limit of the calculation value is E min% (i.e., the lower limit of the opening value mentioned above).

[0109] The method of adjusting the opening of the first bypass valve in steps S802 to S806 to make the temperature of the target medium vary within the target temperature adjustment range will be further described below.

[0110] Figure 9 This is a schematic diagram of a method flow for executing the control mode switching logic of bypass solenoid valve 1 according to an embodiment of this application, as shown below. Figure 9 As shown, the method includes the following steps:

[0111] Step S902: Determine whether the upper limit of temperature control rise and the upper and lower limits of the opening of bypass solenoid valve 1 allowed by the test equipment have been completed. If not, execute the calibration logic of the upper limit of temperature control rise and the upper and lower limits of the opening of bypass solenoid valve 1. If completed, execute the following steps.

[0112] Step S904: When the target set temperature Tmb satisfies a (i.e. the second temperature value mentioned above) < Tmb ≤ b (i.e. the first temperature value mentioned above), close the bypass solenoid valve 1 (i.e. the first bypass valve mentioned above) and maintain the original throttling device (expansion valve) control PID logic.

[0113] Step S906: When the target set temperature Tmb satisfies b (i.e. the first temperature value mentioned above) < Tmb ≤ Tsx (i.e. the upper limit of the first temperature value mentioned above), the opening of the throttling device (expansion valve) is fixed at C1% (i.e. the first opening mentioned above) for a preset time (e.g., 10 min).

[0114] The fixed opening of the throttling device (expansion valve) is adjusted to C2% (i.e. the second opening mentioned above), and the pull-in time of the bypass solenoid valve 1 (i.e. the first bypass valve mentioned above) is controlled by the PID controller, wherein the upper limit of the PID calculation value is Emax% (i.e. the upper limit of the opening value mentioned above), and the lower limit of the calculation value is Emin% (i.e. the lower limit of the opening value mentioned above).

[0115] In step S908, if during equipment operation, Tmb expands from the range a < Tmb ≤ b to a < Tmb ≤ Tsx, then step S906 is executed; if during equipment operation, Tmb shrinks from the range b < Tmb ≤ Tsx to a < Tmb ≤ b, then the bypass solenoid valve 1 is closed, and the original throttling device (expansion valve) control PID logic is maintained.

[0116] The overall software workflow of the refrigeration system temperature regulation method in steps S202 to S208 of the embodiments of this application will be further described below.

[0117] This application modifies the controller program to change the control logic of bypass solenoid valve 1, thereby expanding the temperature control range of the cryogenic refrigeration equipment. Based on functional requirements, the overall software workflow can be divided into four parts: protection parameter calibration, testing the allowable upper limit of temperature control increase and the upper limit of the opening of bypass solenoid valve 1, testing the lower limit of the opening of bypass solenoid valve 1, and executing the logic for switching the control mode of bypass solenoid valve 1.

[0118] Figure 10 This is a schematic diagram of the overall software workflow of a refrigeration system temperature regulation method according to an embodiment of this application, as shown below. Figure 10 As shown, it includes the following steps:

[0119] Step 1002: Calibrate the protection parameters;

[0120] Figure 11 This is a schematic diagram of a protection parameter calibration method provided in an embodiment of this application, as shown below. Figure 11 As shown, it includes the following steps:

[0121] When the refrigeration system has a branch bypass solenoid valve 1 (i.e., the first bypass valve mentioned above), determine the compressor, refrigerant model and other information of the refrigeration system, and based on this information, determine the upper limit of suction and discharge pressure and temperature for normal operation of the compressor, and calculate the minimum allowable suction superheat (threshold) Tgrd, suction pressure warning value (threshold) P1max, discharge pressure warning value (threshold) P2max, suction temperature warning value (threshold) T1max, discharge temperature warning value (threshold) T2max, compressor operating current warning value (threshold) I1max, and the temperature adjustment range of the refrigeration equipment T∈[a,b]℃, and a≤b temperature control accuracy: S1℃, etc.

[0122] Step 1004: Test the upper limit of the temperature control increase allowed by the test equipment (i.e., the first upper limit of temperature mentioned above) and the upper limit of the opening of the bypass solenoid valve 1 (i.e., the first bypass valve mentioned above);

[0123] Specifically, find the upper limit of the allowable temperature control rise of the equipment (i.e., the first upper limit of temperature mentioned above) and the upper limit of the opening of the bypass solenoid valve 1. Set the target temperature of the equipment to b℃ (i.e., the initial upper limit of temperature mentioned above). After the unit runs to the target set value and confirms that the temperature meets the accuracy range of the equipment design for a preset time (e.g., 30 minutes), record the current opening degree C1% of the throttling device (expansion valve) (i.e., the first opening degree mentioned above) and execute. Figure 4 The flowchart shown illustrates the method for determining the upper limit of the first temperature of the target medium and the upper limit of the opening of the first bypass valve.

[0124] Step 1006: Test the lower limit of the opening of bypass solenoid valve 1;

[0125] Specifically, locate the lower limit of the permissible opening of the branch bypass solenoid valve 1 (i.e., the aforementioned first bypass valve), set the target temperature of the equipment to a℃ (i.e., the aforementioned lower limit of the first temperature), and wait until the unit reaches the target set value and confirms that the temperature meets the accuracy range and preset time (e.g., 30 minutes) designed for the equipment before proceeding. Figure 6 The method flow shown is for determining the lower limit of the opening of the first bypass valve.

[0126] Step 1008: Execute the bypass solenoid valve 1 control mode switching logic.

[0127] Specifically, execution Figure 8 The method flow shown is to adjust the opening of the first bypass valve to change the temperature of the target medium within the target temperature adjustment range.

[0128] The proposed solution has low modification costs. If the existing refrigeration system has the bypass solenoid valve 1 of this solution, the temperature control range of the refrigeration equipment can be improved directly by modifying the control program. If the system has a bypass solenoid valve 1, since the bypass solenoid valve is a common design feature in refrigeration systems, adding this configuration has low overall costs and the modification of the entire piping system is simple. In addition, the control method of this application is an extension of the original bypass piping usage, and it can safely extend the temperature control range of the refrigeration equipment and improve the temperature control accuracy without adding additional hardware.

[0129] It should be noted that, depending on actual needs, one can choose whether to follow the logic of this application to improve the temperature control range of the equipment. When the equipment is running normally, the content of this solution can be directly ignored.

[0130] Through the above steps, the upper limit of the allowable temperature control increase and the upper and lower limits of the bypass solenoid valve opening are determined by experimental testing. This achieves the goal of safely expanding the temperature control range of the refrigeration equipment and setting the temperature control accuracy of the equipment. In turn, it solves the technical problem that the bypass solenoid valve of the refrigeration equipment in related technologies is only designed to consume excess cooling capacity, which causes the existing refrigeration equipment to not have the ability to expand the cooling range of the equipment.

[0131] According to an embodiment of this application, another embodiment of a method for regulating the temperature of a refrigeration system is also provided. Figure 12 This is a schematic diagram of another method for temperature regulation of a refrigeration system according to an embodiment of this application, as shown below. Figure 12 As shown, the method includes the following steps:

[0132] Step S1202: Determine the temperature range within the target temperature adjustment range where the target set temperature is located. The target set temperature is the temperature that the target medium in the refrigeration system is to be reached. The target temperature adjustment range is determined by the lower limit of the first lower temperature and the upper limit of the first temperature. The upper limit of the first temperature is determined by adjusting the opening of the first bypass valve of the refrigeration system until the opening of the first bypass valve reaches the first opening threshold or the operating parameters of the refrigeration system do not meet the first parameter threshold condition.

[0133] Step S1204: Based on the temperature range, determine the temperature regulation method, and adjust the opening of the first bypass valve within the target opening range according to the temperature regulation method so that the temperature in the refrigeration system reaches the target set temperature. The target opening range is determined by the upper limit and lower limit of the opening.

[0134] In some embodiments of this application, adjusting the opening of the first bypass valve within a target opening range according to a temperature regulation method corresponding to a temperature range includes the following steps: when the target set temperature is within the range determined by the lower limit of the first lower temperature and the first temperature value, closing the first bypass valve and adjusting the opening of the throttling device to make the actual temperature in the refrigeration system reach the target set temperature, wherein the first temperature value is greater than the lower limit of the first lower temperature and less than the upper limit of the first temperature, the throttling device is used to control the flow rate of refrigerant in the refrigeration system to regulate the temperature, and the first bypass valve is located on the first bypass pipeline to mix part of the refrigerant discharged by the compressor with the refrigerant discharged by the throttling device. The system is connected to the evaporator. When the target set temperature is within the range determined by the first temperature value and the first upper temperature limit, the opening degree of the throttling device is set to the first preset opening degree and maintained for a preset duration to stabilize the operation of the refrigeration system. The first preset opening degree is the opening degree of the throttling device when the actual temperature of the target medium in the refrigeration system reaches the preset temperature, and the preset temperature includes the first temperature value. The opening degree of the throttling device is adjusted to the second preset opening degree, and the opening degree of the first bypass valve is adjusted to make the actual temperature of the target medium reach the target set temperature. The second preset opening degree is less than the first preset opening degree, and the adjustment range of the opening degree of the first bypass valve is the target opening degree range.

[0135] Specifically, when the target set temperature Tmb satisfies a (i.e. the second temperature value mentioned above) < Tmb ≤ b (i.e. the first temperature value mentioned above), the bypass solenoid valve 1 (i.e. the first bypass valve mentioned above) is closed, and the original throttling device (expansion valve) control PID logic is maintained.

[0136] When the target set temperature Tmb satisfies b (i.e. the first temperature value mentioned above) < Tmb ≤ Tsx (i.e. the upper limit of the first temperature value mentioned above), the opening of the throttling device (expansion valve) is fixed at C1% (i.e. the first preset opening value mentioned above) for a preset duration (e.g., 10 min).

[0137] The fixed opening of the throttling device (expansion valve) is adjusted to C2% (i.e., the second preset opening mentioned above), and the closing time of the bypass solenoid valve 1 (i.e., the first bypass valve mentioned above) is controlled by the PID controller, wherein the upper limit of the PID calculation value is E max% (i.e., the upper limit of the opening value mentioned above), and the lower limit of the calculation value is E min% (i.e., the lower limit of the opening value mentioned above).

[0138] According to an embodiment of this application, an embodiment of a temperature regulating device for a refrigeration system is also provided. Figure 13 This is a schematic diagram of a temperature regulating device for a refrigeration system according to an embodiment of this application. Figure 13 As shown, the device includes:

[0139] The opening degree determination module 130 is used to obtain the preset temperature value of the target medium and determine the preset opening degree of the throttling device of the refrigeration system corresponding to the preset temperature value. The throttling device is used to control the flow rate of refrigerant in the refrigeration system to adjust the temperature.

[0140] The upper and lower limit determination module 132 is used to determine the first upper limit value of the target medium and the upper and lower limit values ​​of the opening of the first bypass valve by adjusting the opening of the first bypass valve of the refrigeration system until the opening of the first bypass valve reaches the preset opening threshold or the operating parameters of the refrigeration system do not meet the preset parameter threshold conditions when the opening of the throttling device is fixed at the preset opening.

[0141] Temperature regulation module 134 is used to adjust the opening of the first bypass valve within a target opening range so that the temperature of the target medium changes within the target temperature regulation range. The target opening range is determined by the upper limit and lower limit of the opening, and the target temperature regulation range is determined by the lower limit of the first lower temperature and the upper limit of the first upper temperature.

[0142] It should be noted that each module in the temperature regulation device of the above-mentioned refrigeration system can be a program module (for example, a set of program instructions to implement a certain function) or a hardware module. For the latter, it can be expressed in the following forms, but is not limited to them: each of the above modules is expressed as a processor, or the functions of each of the above modules are implemented by a processor.

[0143] It should be noted that the refrigeration system temperature regulation device provided in this embodiment can be used to perform... Figure 2 The refrigeration system temperature regulation method shown above is also applicable to the embodiments of this application, and will not be repeated here.

[0144] This application embodiment also provides a non-volatile storage medium, which includes a stored computer program. The device containing the non-volatile storage medium executes the following refrigeration system temperature regulation method by running the computer program: obtaining a preset temperature value of the target medium and determining a preset opening degree of the throttling device of the refrigeration system corresponding to the preset temperature value, wherein the throttling device is used to control the flow rate of refrigerant in the refrigeration system to regulate the temperature; when the opening degree of the throttling device is fixed at the preset opening degree, adjusting the opening degree of the first bypass valve of the refrigeration system until the opening degree of the first bypass valve reaches a preset opening degree threshold or the operating parameters of the refrigeration system do not meet the preset parameter threshold conditions, determining a first upper limit value of the target medium temperature and upper and lower limits of the opening degree of the first bypass valve; adjusting the opening degree of the first bypass valve within the target opening degree range to make the temperature of the target medium change within the target temperature regulation range, wherein the target opening degree range is determined by the upper and lower opening degree values, and the target temperature regulation range is determined by the lower lower temperature value and the upper temperature value.

[0145] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0146] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0147] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0148] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0149] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0150] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the 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 to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0151] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for temperature regulation of a refrigeration system, wherein the refrigeration system is used to control the temperature of a target medium, characterized in that, include: Obtain a preset temperature value of the target medium and determine a preset opening degree of the throttling device of the refrigeration system corresponding to the preset temperature value, wherein the throttling device is used to control the flow rate of refrigerant in the refrigeration system to adjust the temperature, and the preset temperature value includes: a first temperature value and a second temperature value. When the opening degree of the throttling device is fixed at the preset opening degree, the opening degree of the first bypass valve of the refrigeration system is adjusted until the opening degree of the first bypass valve reaches the preset opening degree threshold or the operating parameters of the refrigeration system do not meet the preset parameter threshold condition, thereby determining the first upper limit value of the target medium temperature and the upper and lower limits of the opening degree of the first bypass valve. This includes: when the temperature of the target medium reaches the first temperature value and the opening degree of the throttling device is fixed at the first opening degree, the opening degree of the first bypass valve of the refrigeration system is adjusted until the opening degree of the first bypass valve reaches the first opening degree threshold or the operating parameters of the refrigeration system do not meet the first parameter threshold condition, thereby determining the first upper limit value of the target medium temperature and the upper limit value of the opening degree of the first bypass valve. The first opening degree is the preset opening degree of the throttling device when the temperature of the target medium reaches the first temperature value. When the temperature of the target medium reaches the second temperature value and the opening degree of the throttling device is fixed at the second opening degree, the opening degree of the first bypass valve of the refrigeration system is adjusted until the opening degree of the first bypass valve reaches the second opening degree threshold or the operating parameters of the refrigeration system do not meet the second parameter threshold condition. The lower limit value of the opening degree of the first bypass valve is determined, wherein the second temperature value is less than the first temperature value and not less than the lower limit value of the first lower temperature value, the second opening degree is the preset opening degree of the throttling device when the temperature of the target medium reaches the second temperature value, the preset opening degree threshold includes: the first opening degree threshold and the second opening degree threshold, the preset parameter threshold condition includes: the first parameter threshold condition and the second parameter threshold condition, the first bypass valve is provided on the first bypass pipeline, and is used to mix part of the refrigerant discharged by the compressor with the refrigerant discharged by the throttling device and input it into the evaporator; The opening degree of the first bypass valve is adjusted within the target opening degree range so that the temperature of the target medium varies within the target temperature adjustment range. The target opening degree range is determined by the upper limit and lower limit of the opening degree, and the target temperature adjustment range is determined by the lower limit of the first lower temperature and the upper limit of the first temperature.

2. The temperature regulation method for a refrigeration system according to claim 1, characterized in that, The first temperature value is the initial upper limit value set by the refrigeration system, and the second temperature value is the lower limit value of the first temperature.

3. The temperature regulation method for a refrigeration system according to claim 1, characterized in that, By adjusting the opening degree of the first bypass valve of the refrigeration system until the opening degree of the first bypass valve reaches the first opening degree threshold or the operating parameters of the refrigeration system do not meet the first parameter threshold condition, the first upper limit value of the target medium temperature and the upper limit value of the opening degree of the first bypass valve are determined, including: Based on the preset operating cycle duration and target opening value of the first bypass valve, the first bypass valve is controlled to open and close within the operating cycle, and the operating parameters of the refrigeration system within the operating cycle are recorded, wherein the target opening value is greater than the second opening threshold and not greater than the first opening threshold. If the operating parameters meet the first parameter threshold condition, the target opening value is increased by a preset opening increment, and the first bypass valve is re-controlled to open and close according to the preset operating cycle duration and the target opening value after increasing the preset opening increment, and the operating parameters of the refrigeration system are re-recorded until the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition. If the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition, determine whether there is a second bypass valve in the refrigeration system and the opening and closing state of the second bypass valve. The second bypass valve is located on the second bypass pipeline and is used to mix part of the refrigerant discharged by the throttling device with the refrigerant discharged by the evaporator and input it into the compressor. In the case where the second bypass valve is not present in the refrigeration system or the second bypass valve is already in the open state, the actual temperature of the target medium in the first cycle is determined to be the first temperature upper limit value, and the target opening value corresponding to the first cycle is the opening upper limit value, wherein the first cycle is the previous operating cycle immediately preceding the second cycle, and the second cycle is the operating cycle in which the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition.

4. The temperature regulation method for a refrigeration system according to claim 3, characterized in that, After determining whether a second bypass valve exists in the refrigeration system and the open / closed state of the second bypass valve, the process further includes: When the second bypass valve exists in the refrigeration system and is in a closed state, the second bypass valve is opened. After the second bypass valve is opened, If the operating parameters that originally did not meet the first parameter threshold condition meet the first parameter threshold condition again, the target opening value is increased by a preset opening increment, and the first bypass valve is re-controlled to open and close based on the preset operating cycle duration and the target opening value after increasing the preset opening increment. The operating parameters of the refrigeration system are re-recorded until the target opening value reaches the first opening threshold or the operating parameters do not meet the first parameter threshold condition. The actual temperature of the target medium in the first cycle is determined to be the first temperature upper limit value, and the target opening value corresponding to the first cycle is the opening upper limit value. If the operating parameters that did not originally meet the first parameter threshold condition still do not meet the first parameter threshold condition, then the actual temperature of the target medium in the first cycle is determined to be the first temperature upper limit value, and the target opening value corresponding to the first cycle is the opening upper limit value.

5. The method for regulating the temperature of a refrigeration system according to claim 1, characterized in that, The lower limit value of the opening of the first bypass valve is determined by adjusting the opening degree of the first bypass valve until the opening degree of the first bypass valve reaches the second opening degree threshold or the operating parameters of the refrigeration system do not meet the second parameter threshold condition. Determine the preset operating cycle duration and preset target opening value of the first bypass valve, wherein the initially preset target opening value is greater than the second opening threshold and not greater than the first opening threshold; Based on the preset operating cycle duration and target opening value of the first bypass valve, the first bypass valve is controlled to open and close within the operating cycle, and the operating parameters of the refrigeration system within the operating cycle are recorded. If the operating parameters meet the second parameter threshold condition, the target opening value is reduced by a preset opening increment, and the first bypass valve is re-controlled to open and close according to the preset operating cycle duration and the target opening value after reducing the preset opening increment. The operating parameters of the refrigeration system are re-recorded until the target opening value reaches the second opening threshold or the operating parameters do not meet the second parameter threshold condition. If the target opening value reaches the second opening threshold or the operating parameters do not meet the second parameter threshold condition, the target opening value corresponding to the third cycle is determined to be the lower limit value of the opening, wherein the third cycle is the previous operating cycle immediately adjacent to the fourth cycle, and the fourth cycle is the operating cycle in which the target opening value reaches the second opening threshold or the operating parameters do not meet the second parameter threshold condition.

6. The method for regulating the temperature of a refrigeration system according to any one of claims 3 to 5, characterized in that, Controlling the opening and closing of the first bypass valve during the operating cycle includes: Determine the preset operating cycle duration and preset target opening value of the first bypass valve; The closing time and opening time of the first bypass valve in one operating cycle are calculated based on the preset operating cycle duration and the target opening value. The first bypass valve is controlled to engage and disengage based on the engagement time and the disengagement time, wherein the first bypass valve is in an open state when it engages and in a closed state when it disengages.

7. The method for regulating the temperature of a refrigeration system according to claim 2, characterized in that, The operating parameters are used to characterize the working state of the refrigeration system. The operating parameters include: actual suction pressure, actual discharge pressure, actual suction temperature, actual discharge temperature, compressor operating current, and compressor superheat. The first parameter threshold conditions include: suction pressure threshold, discharge pressure threshold, suction temperature threshold, discharge temperature threshold, and compressor operating current threshold. The second parameter threshold conditions include: suction pressure threshold, discharge pressure threshold, suction temperature threshold, discharge temperature threshold, compressor operating current threshold, and compressor superheat threshold.

8. The method for regulating the temperature of a refrigeration system according to claim 1, characterized in that, Adjusting the opening of the first bypass valve within the target opening range to change the temperature of the target medium within the target temperature adjustment range includes: When the target set temperature is within the range determined by the second temperature value and the first temperature value, the first bypass valve is closed and the opening of the throttling device is adjusted so that the actual temperature of the target medium in the refrigeration system reaches the target set temperature, wherein the target set temperature is the temperature that the target medium in the refrigeration system is planned to reach. When the target set temperature is within the range determined by the first temperature value and the first upper temperature value, the opening degree of the throttling device is set to the first opening degree and maintained for a preset time to stabilize the operation of the refrigeration system. The opening degree of the throttling device is adjusted to a second opening degree, and the opening degree of the first bypass valve is adjusted to make the actual temperature in the refrigeration system reach the target set temperature, wherein the second opening degree is less than the first opening degree, and the adjustment range of the opening degree of the first bypass valve is the target opening degree range.

9. A method for temperature regulation in a refrigeration system, characterized in that, include: The target set temperature is determined to be within the temperature range of the target temperature adjustment range. The target set temperature is the temperature that the target medium in the refrigeration system is to be reached. The target temperature adjustment range is determined by a first lower temperature limit and a first upper temperature limit. The first upper temperature limit is determined by adjusting the opening of the first bypass valve of the refrigeration system until the opening of the first bypass valve reaches a first opening threshold or the operating parameters of the refrigeration system do not meet the first parameter threshold condition. Based on the temperature range, a temperature regulation method is determined, and the opening of the first bypass valve is adjusted within the target opening range according to the temperature regulation method, so that the temperature in the refrigeration system reaches the target set temperature, wherein the target opening range is determined by the upper limit value and the lower limit value of the opening. The adjustment of the opening of the first bypass valve within the target opening range, according to the temperature regulation method corresponding to the temperature range, includes: when the target set temperature is within the range determined by the lower limit of the first lower temperature and the first temperature value, closing the first bypass valve and adjusting the opening of the throttling device to make the actual temperature in the refrigeration system reach the target set temperature, wherein the first temperature value is greater than the lower limit of the first lower temperature and less than the upper limit of the first temperature, the throttling device is used to control the flow rate of refrigerant in the refrigeration system to regulate the temperature, and the first bypass valve is located on the first bypass pipeline to mix part of the refrigerant discharged from the compressor with the refrigerant discharged from the throttling device and input it into the evaporator; in the target When the set temperature is within the range determined by the first temperature value and the first upper temperature value, the opening degree of the throttling device is set to a first preset opening degree and maintained for a preset duration to stabilize the operation of the refrigeration system. The first preset opening degree is the opening degree of the throttling device when the actual temperature of the target medium in the refrigeration system reaches a preset temperature, and the preset temperature includes the first temperature value. The opening degree of the throttling device is then adjusted to a second preset opening degree, and the opening degree of the first bypass valve is adjusted to ensure that the actual temperature of the target medium reaches the target set temperature. The second preset opening degree is less than the first preset opening degree, and the adjustment range of the opening degree of the first bypass valve is the target opening degree range.

10. A temperature regulating device for a refrigeration system, wherein the refrigeration system is used to control the temperature of a target medium, characterized in that, include: An opening degree determination module is used to obtain a preset temperature value of the target medium and determine the preset opening degree of the throttling device of the refrigeration system corresponding to the preset temperature value. The throttling device is used to control the flow rate of refrigerant in the refrigeration system to adjust the temperature. The preset temperature value includes a first temperature value and a second temperature value. The upper and lower limit determination module is used to determine the first upper limit value of the target medium and the upper and lower limit values ​​of the opening of the first bypass valve by adjusting the opening of the first bypass valve of the refrigeration system until the opening of the first bypass valve reaches a preset opening threshold or the operating parameters of the refrigeration system do not meet the preset parameter threshold conditions when the opening degree of the throttling device is fixed at the preset opening degree. This includes: when the temperature of the target medium reaches the first temperature value and the opening degree of the throttling device is fixed at the first opening degree, adjusting the opening degree of the first bypass valve of the refrigeration system until the opening degree of the first bypass valve reaches the first opening threshold or the operating parameters of the refrigeration system do not meet the first parameter threshold conditions to determine the first upper limit value of the target medium and the upper and lower limit values ​​of the opening of the first bypass valve. The first opening degree is the preset opening degree of the throttling device when the temperature of the target medium reaches the first temperature value. When the temperature of the target medium reaches the second temperature value and the opening degree of the throttling device is fixed at the second opening degree, the opening degree of the first bypass valve of the refrigeration system is adjusted until the opening degree of the first bypass valve reaches the second opening degree threshold or the operating parameters of the refrigeration system do not meet the second parameter threshold condition, and the lower limit value of the opening degree of the first bypass valve is determined. The second temperature value is less than the first temperature value and not less than the lower limit value of the first lower temperature. The second opening degree is the preset opening degree of the throttling device when the temperature of the target medium reaches the second temperature value. The preset opening degree threshold includes: the first opening degree threshold and the second opening degree threshold. The preset parameter threshold condition includes: the first parameter threshold condition and the second parameter threshold condition. The first bypass valve is located on the first bypass pipeline and is used to mix part of the refrigerant discharged from the compressor with the refrigerant discharged from the throttling device and input it into the evaporator. A temperature control module is used to adjust the opening of the first bypass valve within a target opening range so that the temperature of the target medium varies within the target temperature control range. The target opening range is determined by an upper opening limit and an lower opening limit, and the target temperature control range is determined by a lower lower temperature limit and a higher upper temperature limit.

11. An electronic device, characterized in that, include: A memory and a processor, the processor being configured to run a program stored in the memory, wherein the program, when running, executes the refrigeration system temperature regulation method according to any one of claims 1 to 8 or the refrigeration system temperature regulation method according to claim 9.

12. A non-volatile storage medium, characterized in that, The non-volatile storage medium includes a stored computer program, wherein the device containing the non-volatile storage medium executes the refrigeration system temperature regulation method according to any one of claims 1 to 8 or the refrigeration system temperature regulation method according to any one of claims 9 by running the computer program.

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