Refrigeration equipment bypass oil return system, refrigeration equipment and oil return control method

Abstract

The present invention provides a refrigeration equipment bypass oil return system, refrigeration equipment, and oil return control method. The system includes a first compressor, an oil separator, a condenser-evaporator, a first throttling element, and an evaporator connected in sequence, wherein the evaporator is connected to the first compressor; the system also includes a first bypass line; the inlet of the first bypass line is connected between the oil separator and the condenser-evaporator, and the outlet of the first bypass line is connected between the first throttling element and the evaporator; the first bypass line is used to transfer high-temperature gaseous refrigerant from the outlet of the first compressor to the evaporator. The system provided by the present invention can solve the problem of difficulty in returning refrigeration oil due to poor fluidity, prevent refrigeration oil from continuously accumulating in the evaporator, thereby avoiding a decrease in the heat exchange efficiency of the evaporator, alleviate the problem of reduced refrigeration oil circulating between the compressor and the oil separator, ensure the lubrication of the compressor, and reduce cylinder wear.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a refrigeration equipment bypass oil return system, refrigeration equipment, and an oil return control method. Background Art

[0002] During the cooling process of refrigerators and other equipment, a small amount of refrigerant oil enters the refrigeration system's circulation because the oil separator's oil separation efficiency cannot reach 100%. Over extended operation, this accumulation of refrigerant oil can occur in the refrigeration piping. On the evaporator side, where the temperature is below the oil's pour point, the oil's viscosity increases, causing poor fluidity and exacerbating the accumulation. On the one hand, prolonged accumulation of refrigerant oil in the evaporator piping impairs the evaporator's heat exchange efficiency, reducing the system's cooling capacity and causing the refrigerator's internal temperature to fall below the target. On the other hand, accumulated refrigerant oil in the evaporator piping reduces the amount of refrigerant oil circulating, resulting in reduced oil return to the compressor, poor lubrication, and potentially damaging the compressor over extended operation. Summary of the Invention

[0003] In order to solve the problem that the existing refrigerant and refrigeration oil cannot be completely separated, the present application provides a refrigeration equipment bypass oil return system, refrigeration equipment and oil return control method, which can avoid oil accumulation in the evaporator and oil shortage in the compressor of the refrigeration equipment.

[0004] In one aspect, a refrigeration equipment bypass oil return system is provided, the system comprising a first compressor, an oil separator, a condenser evaporator, a first throttling element, and an evaporator connected in sequence, wherein the evaporator is connected to the first compressor; the system is characterized in that the system comprises a first bypass pipeline;

[0005] The inlet of the first bypass line is connected between the oil separator and the condenser evaporator, and the outlet of the first bypass line is connected between the first throttling element and the evaporator;

[0006] The first bypass line is used to transmit the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator, so as to increase the temperature and fluidity of the refrigeration oil retained in the evaporator and take the refrigeration oil away from the evaporator.

[0007] In some embodiments, the system further includes a first solenoid valve disposed on the first bypass line.

[0008] In some embodiments, the system further comprises a second bypass line;

[0009] The inlet of the second bypass line is connected between the evaporator and the first compressor, and the outlet of the second bypass line is connected to the oil return port of the first compressor:

[0010] The second bypass channel is used to transport the refrigeration oil output from the evaporator to the first compressor.

[0011] In some embodiments, the system further comprises a vapor-liquid separator;

[0012] The inlet of the vapor-liquid separator is connected to the outlet of the evaporator, the outlet of the vapor-liquid separator is connected to the inlet of the first compressor, and the oil outlet of the vapor-liquid separator is connected to the inlet of the second bypass line;

[0013] The vapor-liquid separator is used to separate the refrigeration oil and the refrigerant output by the evaporator, transport the separated refrigerant to the first compressor, and transport the separated refrigeration oil to the second bypass pipeline.

[0014] In some embodiments, the system further includes a second solenoid valve disposed on the second bypass line.

[0015] In some embodiments, the system further comprises a second compressor, a condenser, and a second throttling element connected in sequence;

[0016] The output end of the second throttling element is connected to the second compressor through the condenser evaporator.

[0017] On the other hand, a refrigeration device is provided, which includes the refrigeration device bypass oil return system as described above.

[0018] In another aspect, an oil return control method is provided, which is applied to the bypass oil return system of the refrigeration equipment described above, wherein the system includes a first solenoid valve provided in the first bypass line, and the method includes:

[0019] Obtaining the operating time of the refrigeration equipment, and determining whether the operating time is greater than a preset first operating time threshold;

[0020] If the operating time is greater than a preset first operating time threshold, the first solenoid valve is opened to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator.

[0021] In some embodiments, opening the first solenoid valve to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator includes:

[0022] The first solenoid valve is opened for a preset number of times continuously, each opening time of the first solenoid valve is a preset opening time length, and a preset interval time length is left between two adjacent opening operations.

[0023] In some embodiments, the method further comprises:

[0024] Determining whether the running time is greater than a preset second running time threshold;

[0025] If the operating time is greater than a preset second operating time threshold, the second solenoid valve is opened to deliver the refrigeration oil output from the evaporator to the first compressor.

[0026] In another aspect, an oil return control device is provided, comprising:

[0027] An operating time acquisition module is used to obtain the operating time of the refrigeration equipment and determine whether the operating time is greater than a preset first operating time threshold;

[0028] The first solenoid valve control module is configured to open the first solenoid valve to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator if the operating time is greater than a preset first operating time threshold.

[0029] In some embodiments, the first solenoid valve control module is specifically configured to:

[0030] The first solenoid valve is opened for a preset number of times continuously, each opening time of the first solenoid valve is a preset opening time length, and a preset interval time length is left between two adjacent opening operations.

[0031] In some embodiments, the oil return control device further includes a second solenoid valve control module, configured to:

[0032] Determining whether the running time is greater than a preset second running time threshold;

[0033] If the operating time is greater than a preset second operating time threshold, the second solenoid valve is opened to deliver the refrigeration oil output from the evaporator to the first compressor.

[0034] On the other hand, a computer device is provided, which includes a processor and a memory, wherein the memory stores at least one instruction, at least one program, code set or instruction set, and the processor can load and execute at least one instruction, at least one program, code set or instruction set to implement the oil return control method provided in the above-mentioned application embodiment.

[0035] On the other hand, a computer-readable storage medium is provided, in which at least one instruction, at least one program, code set or instruction set is stored. The processor can load and execute at least one instruction, at least one program, code set or instruction set to implement the oil return control method provided in the above-mentioned embodiment of the present application.

[0036] In another aspect, a computer program product or computer program is provided. The computer program product or computer program includes computer program instructions stored in a computer-readable storage medium. A processor reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the oil return control method described in any of the above embodiments.

[0037] The technical solution provided by the present application has the following beneficial effects at least: the embodiment of the present invention provides a refrigeration equipment bypass oil return system, refrigeration equipment and oil return control method, the system comprising a first compressor, an oil separator, a condenser evaporator, a first throttling element and an evaporator connected in sequence, the evaporator being connected to the first compressor; the system further comprising a first bypass line; the inlet of the first bypass line being connected between the oil separator and the condenser evaporator, the outlet of the first bypass line being connected between the first throttling element and the evaporator; the first bypass line being used to transfer the high-temperature gaseous refrigerant from the outlet of the first compressor to the evaporator to increase the temperature and fluidity of the refrigeration oil retained in the evaporator and to remove the refrigeration oil from the evaporator. The system provided by the embodiment of the present invention can solve the problem of refrigeration oil being difficult to return due to poor fluidity, prevent refrigeration oil from continuously accumulating in the evaporator, thereby avoiding a decrease in evaporator heat exchange efficiency, alleviate the problem of reduced refrigeration oil circulating between the compressor and the oil separator, ensure that the refrigeration oil circulation volume of the compressor always meets the demand, ensure the lubrication of the compressor, and reduce the wear of the compressor cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0039] Figure 1 A schematic structural diagram of a bypass oil return system for refrigeration equipment provided by an exemplary embodiment of the present application is shown;

[0040] Figure 2 A schematic diagram of an implementation flow of an oil return control method provided by an exemplary embodiment of the present application is shown;

[0041] Figure 3 A schematic diagram of an implementation flow of an oil return control method provided by an exemplary embodiment of the present application is shown;

[0042] Figure 4 A schematic structural diagram of an oil return control device provided by an exemplary embodiment of the present application is shown;

[0043] Figure 5 A structural schematic diagram of a computer device corresponding to an oil return control method provided by an exemplary embodiment of the present application is shown.

[0044] In the figure, 1 is a low-temperature compressor, 2 is an oil separator, 3 is an evaporator, 4 is a low-temperature capillary tube, 5 is a condenser evaporator, 6 is a vapor-liquid separator, 7 is a first solenoid valve, 8 is a second solenoid valve, 9 is a high-temperature compressor, 10 is a high-temperature capillary tube, and 11 is a condenser. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0046] The refrigeration equipment bypass oil return system provided in this application can solve the problems of oil accumulation in the evaporator and oil shortage in the compressor.

[0047] Example 1

[0048] Figure 1 A schematic structural diagram of a bypass oil return system for refrigeration equipment provided by an embodiment of the present invention is shown.

[0049] The system provided by the embodiment of the present invention includes a first compressor, an oil separator, a condenser evaporator, a first throttling element and an evaporator connected in sequence, wherein the evaporator is connected to the first compressor; characterized in that the system includes a first bypass line;

[0050] The inlet of the first bypass line is connected between the oil separator and the condenser evaporator, and the outlet of the first bypass line is connected between the first throttling element and the evaporator;

[0051] The first bypass line is used to transmit the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator, so as to increase the temperature and fluidity of the refrigeration oil retained in the evaporator and take the refrigeration oil away from the evaporator.

[0052] In some embodiments, the system further includes a first solenoid valve disposed on the first bypass line.

[0053] In a specific example, the first compressor is a low-temperature stage compressor, and the first throttling element is a low-temperature stage capillary tube.

[0054] See also Figure 1 , Figure 1Among them, 1 is the low-temperature compressor, 2 is the oil separator, 3 is the evaporator, 4 is the low-temperature capillary tube, 5 is the condenser evaporator, 6 is the vapor-liquid separator, 7 is the first solenoid valve, 8 is the second solenoid valve, 9 is the high-temperature compressor, 10 is the high-temperature capillary tube, and 11 is the condenser; A is the separator inlet, B is the separator outlet, and C is the oil outlet.

[0055] The oil separator to the oil return port of the first compressor constitutes a main oil return channel, which returns the refrigeration oil separated by the oil separator to the compressor.

[0056] In traditional refrigeration systems, as refrigerant from the low-temperature refrigeration system is delivered by the low-temperature compressor to the low-temperature condenser and evaporator, the refrigerant oil inside the compressor forms oil foam due to the compressor's operation and high temperatures. Because the oil separator cannot completely separate the refrigerant oil, the oil foam is carried along with the refrigerant into the refrigeration system, and a small amount of refrigerant oil always enters the low-temperature section. In the throttling element, as the refrigerant transforms from gas to liquid and cools down, the temperature drops below the pour point of the refrigerant oil, for example, below -50°C. This causes the oil to lose fluidity and aggregate into fine droplets. Over time, refrigerant oil accumulates in the evaporator. Residual oil at the bottom of the evaporator tube increases the thermal resistance between the refrigerant and the refrigeration equipment housing, reducing the evaporator's heat transfer efficiency and reducing the cooling capacity of the air inside the housing. Refrigerant oil accumulation in the evaporator affects the temperature uniformity within the refrigeration equipment, leading to temperature fluctuations and temperature stratification. Furthermore, this accumulated oil droplet volume gradually decreases, compromising lubrication and accelerating wear on the compression cylinder.

[0057] In the embodiment provided by the present invention, when refrigeration oil accumulates on the evaporator side, the accumulated refrigeration oil can be brought back to the compressor through a bypass line.

[0058] Specifically, opening the first solenoid valve directs the high-temperature gaseous refrigerant from the compressor outlet to the evaporator inlet, increasing the evaporator's temperature, the evaporator's flow rate, and the evaporator's inlet pressure. Opening the first solenoid valve raises the temperature of the refrigerant oil in the evaporator above its pour point. The high flow of high-pressure refrigerant carries the fluid-rich refrigerant oil through the evaporator. After a period of flushing, the refrigerant oil remaining in the evaporator is removed and returned to the first compressor for the main oil return cycle.

[0059] When using a bypass line to remove refrigerant oil from the evaporator, the bypass line's smaller diameter and smaller refrigerant flow rate prevents normal compressor operation. This also prevents the compressor from shutting down due to increased suction pressure from introducing high-pressure gaseous refrigerant into the evaporator. Since most of the refrigerant remains in normal cooling operation, the temperature rise during the oil removal process quickly returns to normal operation, without affecting the refrigeration equipment.

[0060] The above system is a low-temperature refrigeration system. In some embodiments, the system provided by the present invention also includes a high-temperature refrigeration system, and the high-temperature refrigeration system includes a second compressor, a condenser, and a second throttling element connected in sequence;

[0061] The output end of the second throttling element is connected to the second compressor through the condenser evaporator.

[0062] Optionally, the refrigeration equipment bypass oil return system provided in the embodiment of the present invention can be applied to the low-temperature refrigeration part of a cascade refrigeration system.

[0063] In a specific example, the second compressor is a high-temperature compressor, and the second throttling element is a high-temperature stage condensation and evaporation passage.

[0064] The refrigeration equipment bypass oil return system provided in the embodiment of the present invention can solve the problem of difficulty in returning the refrigerant oil due to poor fluidity. By regularly returning the refrigerant oil accumulated in the evaporator to the main oil return cycle, it can not only ensure that there is no additional thermal resistance in the evaporator, but also stabilize the maximum heat exchange efficiency of the evaporator. It can also ensure that the refrigerant oil circulation volume of the compressor always meets the demand, thereby alleviating the cylinder wear of the compressor.

[0065] Example 2

[0066] See also Figure 1 , the refrigeration equipment bypass oil return system provided by the embodiment of the present invention further includes a second bypass pipeline;

[0067] The inlet of the second bypass line is connected between the evaporator and the first compressor, and the outlet of the second bypass line is connected to the oil return port of the first compressor:

[0068] The second bypass channel is used to transport the refrigeration oil output from the evaporator to the first compressor.

[0069] In some embodiments, the system further comprises a vapor-liquid separator;

[0070] The inlet of the vapor-liquid separator is connected to the outlet of the evaporator, the outlet of the vapor-liquid separator is connected to the inlet of the first compressor, and the oil outlet of the vapor-liquid separator is connected to the inlet of the second bypass line;

[0071] The vapor-liquid separator is used to separate the refrigeration oil and the refrigerant output by the evaporator, transport the separated refrigerant to the first compressor, and transport the separated refrigeration oil to the second bypass pipeline.

[0072] In some embodiments, the system further includes a second solenoid valve disposed on the second bypass line.

[0073] In some embodiments, the second bypass line is a bypass purge oil return line, which can effectively transport the refrigeration oil output from the evaporator back to the compressor.

[0074] In a specific example, after the first solenoid valve opens, refrigerant oil is transferred from the evaporator to the vapor-liquid separator. The vapor refrigerant and liquid refrigerant oil are separated in the vapor-liquid separator, and the refrigerant enters the compressor through the normal circuit. After the refrigerant oil accumulates for a period of time, the second solenoid valve opens, and the compressor's suction draws the refrigerant oil from the vapor-liquid separator back to the compressor through a second bypass channel, where it rejoins the main oil return circuit, ensuring sufficient refrigerant oil for compressor lubrication.

[0075] In summary, the refrigeration equipment bypass oil return system provided by the embodiment of the present invention can maintain the heat exchange efficiency of the refrigerator evaporator by improving the oil return of the refrigeration oil, avoid the risk of the temperature in the box rising due to the change in the heat exchange efficiency of the heat exchanger after a long period of operation, and ensure the safety of the items stored in the box. It can also reduce the fluctuation of the circulating oil volume of the system's refrigeration oil, delay the operating wear of the compressor, and increase the service life of the compressor. Furthermore, the system provided by the embodiment of the present invention can open the solenoid valve when shut down to quickly balance the pressure on the suction and exhaust sides, relieve the high pressure caused by the evaporation of the refrigerant on the low-temperature side, and can quickly reduce the dimensionality of the exhaust section to avoid burns to maintenance personnel.

[0076] Example 3:

[0077] The present invention provides a refrigeration device, comprising the refrigeration device bypass oil return system as described above.

[0078] In one specific example, the refrigeration device includes a cascade refrigeration low-temperature refrigerator.

[0079] Example 4:

[0080] Figure 2 A schematic diagram of the implementation flow of the oil return control method provided by an embodiment of the present invention is shown.

[0081] See also Figure 2 The oil return control method provided in an embodiment of the present invention is applied to a bypass oil return system of a refrigeration device, and the method includes steps 101 to 102.

[0082] Obtaining the operating time of the refrigeration equipment, and determining whether the operating time is greater than a preset first operating time threshold;

[0083] If the operating time is greater than a preset first operating time threshold, the first solenoid valve is opened to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator.

[0084] In some embodiments, opening the first solenoid valve to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator includes:

[0085] The first solenoid valve is opened for a preset number of times continuously, each opening time of the first solenoid valve is a preset opening time length, and a preset interval time length is left between two adjacent opening operations.

[0086] In order to transport the refrigeration oil back to the compressor as thoroughly as possible without affecting the normal circulation of the refrigerant, the refrigeration oil can be output to the evaporator by opening the first solenoid valve multiple times.

[0087] In some embodiments, the method further comprises:

[0088] Determining whether the running time is greater than a preset second running time threshold;

[0089] If the operating time is greater than a preset second operating time threshold, the second solenoid valve is opened to deliver the refrigeration oil output from the evaporator to the first compressor.

[0090] The oil return control method provided in the embodiment of the present invention can ensure that there is no additional thermal resistance in the evaporator, stabilize the maximum heat exchange efficiency of the evaporator, and ensure that the refrigeration oil circulation volume of the compressor always meets the demand, thereby alleviating the cylinder wear of the compressor.

[0091] Example 5

[0092] Figure 3 Another implementation flow diagram of the oil return control method provided by an embodiment of the present invention is shown.

[0093] See also Figure 3 In a specific example, the implementation process of the oil return control method provided by the embodiment of the present invention is as follows.

[0094] First, the operating status and operating time T0 of the device are detected, and it is determined whether the operating time T0 is greater than a preset first operating time threshold t0.

[0095] If the device is not in the running state or the running time is less than the first time threshold, the detection is repeated.

[0096] If the device is in the running state and the running time T0 is greater than the preset first time threshold t0, the first solenoid valve is opened, and the opening time T1 of the first solenoid valve is recorded.

[0097] After the first solenoid valve is opened, a bypass line is connected to guide a small amount of high-pressure, high-temperature refrigerant gas into the evaporator. This forms a localized high-temperature air mass, which heats the refrigerant oil deposited in the evaporator, raising the oil's temperature above its pour point. This reduced viscosity of the refrigerant oil facilitates its flow toward the evaporator outlet. Since low-temperature refrigerant is still flowing in the main line, this high-temperature air mass is pushed into the vapor-liquid separator. As the high-temperature air mass exchanges heat with the low-temperature refrigerant during its flow, the oil's temperature drops and its viscosity increases after leaving the evaporator outlet, causing it to settle at the bottom of the vapor-liquid separator.

[0098] A determination is made as to whether the first solenoid valve opening time T1 reaches a preset opening time threshold t1. When the first solenoid valve opening time T1 reaches the preset first opening time threshold t1, the first solenoid valve is closed. After closing the first solenoid valve, the first solenoid valve is opened again after an interval t3 to open the oil return passage. Similarly, the first solenoid valve is opened for a duration t1.

[0099] The number of times the first solenoid valve is opened is counted, which is N1. When the number of times the first solenoid valve is opened reaches the preset number n1, the equipment operation time T0 is detected again.

[0100] It is determined whether the running time T0 is greater than a preset second running time threshold t0'.

[0101] If the device operation time is less than the second time threshold, the detection is repeated.

[0102] If the device operation time T0 is greater than the preset second time threshold t2, the second solenoid valve is opened, and the opening time T2 of the second solenoid valve is recorded.

[0103] After opening the second solenoid valve, the bypass purge oil return line is connected, and the refrigeration oil accumulated in the vapor-liquid separator can be brought back to the compressor through the compressor oil return port.

[0104] It is determined whether the opening time T2 of the second solenoid valve reaches the preset second opening time threshold t2. When the opening time T2 of the second solenoid valve reaches the preset opening time threshold t2, the second solenoid valve is closed, and the current oil return control process ends.

[0105] In summary, the oil return control method provided by the embodiments of the present invention can maintain the heat exchange efficiency of the refrigerator evaporator by improving the return of refrigerant oil. This method avoids the risk of temperature rise within the refrigerator due to changes in heat exchange efficiency after long-term operation, thereby ensuring the safety of stored items. It can also reduce fluctuations in the circulating refrigerant oil volume in the system, slowing down compressor wear and extending compressor service life.

[0106] Example 6

[0107] Figure 4The figure shows a schematic structural diagram of an oil return control device provided by an embodiment of the present invention.

[0108] See also Figure 4 The oil return control device provided by the embodiment of the present invention may include:

[0109] The operating time acquisition module 201 is used to obtain the operating time of the refrigeration equipment and determine whether the operating time is greater than a preset first operating time threshold;

[0110] The first solenoid valve control module 202 is configured to open the first solenoid valve to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator if the operating time is greater than a preset first operating time threshold.

[0111] In some embodiments, the first solenoid valve control module 202 is specifically configured to:

[0112] The first solenoid valve is opened for a preset number of times continuously, each opening time of the first solenoid valve is a preset opening time length, and a preset interval time length is left between two adjacent opening operations.

[0113] In some embodiments, the oil return control device further includes a second solenoid valve control module, configured to:

[0114] Determining whether the running time is greater than a preset second running time threshold;

[0115] If the operating time is greater than a preset second operating time threshold, the second solenoid valve is opened to deliver the refrigeration oil output from the evaporator to the first compressor.

[0116] To sum up, the device provided in the embodiment of the present invention can regularly return the refrigerant oil accumulated in the evaporator to the main return oil circulation, which not only ensures that there is no additional thermal resistance in the evaporator, but also stabilizes the maximum heat exchange efficiency of the evaporator, and can also ensure that the refrigerant oil circulation volume of the compressor always meets the demand, thereby alleviating the cylinder wear of the compressor.

[0117] Example 7

[0118] Figure 5 A schematic diagram of the structure of a computer device provided by an exemplary embodiment of the present application is shown, wherein the computer device includes:

[0119] The processor 301 includes one or more processing cores. The processor 301 executes various functional applications and data processing by running software programs and modules.

[0120] Receiver 302 and transmitter 303 can be implemented as a communication component, which can be a communication chip. Optionally, the communication component can include signal transmission functionality. That is, transmitter 303 can be used to transmit control signals to the image acquisition device and scanning device, and receiver 302 can be used to receive corresponding feedback instructions.

[0121] The memory 304 is connected to the processor 301 via a bus 305 .

[0122] The memory 304 may be used to store at least one instruction, and the processor 301 may be used to execute the at least one instruction to implement steps 101 to 102 in the above-mentioned embodiment of the oil return control method.

[0123] Those skilled in the art will understand that Figure 4 This is merely an example of a computer device and does not constitute a limitation of the computer device. The computer device may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the computer device may also include a network access device, etc.

[0124] The processor 301 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0125] The memory 304 may be an internal storage unit of the computer device, such as a hard disk or memory of the computer device. The memory 304 may also be an external storage device of the computer device, such as a plug-in hard disk equipped on the computer device, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Furthermore, the memory 304 may include both an internal storage unit of the computer device and an external storage device. The memory 304 is used to store the computer program and other programs and data required by the terminal device. The memory 304 may also be used to temporarily store data that has been output or is about to be output.

[0126] Example 8

[0127] An embodiment of the present application also provides a computer-readable storage medium, which stores at least one instruction, at least one program, code set or instruction set, to be loaded and executed by a processor to implement the above-mentioned oil return control method.

[0128] Optionally, the computer-readable storage medium may include: a read-only memory (ROM), a random access memory (RAM), a solid-state drive (SSD), or an optical disk, etc. Among them, the random access memory may include a resistance random access memory (ReRAM) and a dynamic random access memory (DRAM).

[0129] Example 9:

[0130] The present application also provides a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the oil return control method described in any of the above embodiments.

[0131] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the pros and cons of the implementation.

[0132] Those skilled in the art will understand that all or part of the steps of implementing the above embodiments can be completed by hardware or by instructing the relevant hardware to complete the steps through a program. The program can be stored in a computer-readable storage medium. The above-mentioned storage medium can be a read-only memory, a disk or an optical disk, etc. Those skilled in the art will clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual application, the above-mentioned functions can be distributed to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into a unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above system can refer to the corresponding process in the above-mentioned method embodiment and will not be repeated here.

[0133] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0134] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0135] The computer program includes computer program code, which may be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electric carrier signal, a telecommunication signal, and a software distribution medium. It should be noted that the content of the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0136] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. An oil return control method, applied to a bypass oil return system of a refrigeration device, wherein the system comprises a first compressor, an oil separator, a condenser evaporator, a first throttling element, and an evaporator connected in sequence, wherein the evaporator is connected to the first compressor; characterized in that: The system includes a first bypass line; The inlet of the first bypass line is connected between the oil separator and the condenser evaporator, and the outlet of the first bypass line is connected between the first throttling element and the evaporator; The first bypass line is used to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator, so as to increase the temperature and fluidity of the refrigeration oil retained in the evaporator and carry the refrigeration oil away from the evaporator; The system further includes a first solenoid valve, which is disposed on the first bypass line; The system also includes a second bypass line; The inlet of the second bypass line is connected between the evaporator and the first compressor, and the outlet of the second bypass line is connected to the oil return port of the first compressor: The second bypass channel is used to transport the refrigeration oil output by the evaporator to the first compressor; The system also includes a vapor-liquid separator; The inlet of the vapor-liquid separator is connected to the outlet of the evaporator, the outlet of the vapor-liquid separator is connected to the inlet of the first compressor, and the oil outlet of the vapor-liquid separator is connected to the inlet of the second bypass line; The vapor-liquid separator is used to separate the refrigeration oil and refrigerant output by the evaporator, transport the separated refrigerant to the first compressor, and transport the separated refrigeration oil to the second bypass pipeline; The system further includes a second solenoid valve, which is disposed on the second bypass line; The oil return control method includes: Obtaining the operating time of the refrigeration equipment, and determining whether the operating time is greater than a preset first operating time threshold; If the operating time is greater than a preset first operating time threshold, opening the first solenoid valve to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator; The step of opening the first solenoid valve to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator includes: The first solenoid valve is opened for a preset number of times in succession, wherein each opening time of the first solenoid valve is a preset opening time, and a preset interval time is left between two adjacent opening operations; The method further comprises: Determining whether the running time is greater than a preset second running time threshold; If the operating time is greater than a preset second operating time threshold, the second solenoid valve is opened to deliver the refrigeration oil output from the evaporator to the first compressor.

2. The oil return control method according to claim 1, characterized in that: The system further includes a second compressor, a condenser, and a second throttling element connected in sequence; The output end of the second throttling element is connected to the second compressor through the condenser evaporator.

3. A refrigeration device, characterized in that: The refrigeration equipment is applied with the oil return control method according to any one of claims 1 to 2.

4. An oil return control device, characterized in that: The device is applied to a bypass oil return system of a refrigeration device, wherein the system comprises a first compressor, an oil separator, a condenser evaporator, a first throttling element and an evaporator connected in sequence, wherein the evaporator is connected to the first compressor; the system is characterized in that the system comprises a first bypass pipeline; The inlet of the first bypass line is connected between the oil separator and the condenser evaporator, and the outlet of the first bypass line is connected between the first throttling element and the evaporator; The first bypass line is used to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator, so as to increase the temperature and fluidity of the refrigeration oil retained in the evaporator and carry the refrigeration oil away from the evaporator; The system further includes a first solenoid valve, which is disposed on the first bypass line; The system also includes a second bypass line; The inlet of the second bypass line is connected between the evaporator and the first compressor, and the outlet of the second bypass line is connected to the oil return port of the first compressor: The second bypass channel is used to transport the refrigeration oil output by the evaporator to the first compressor; The system also includes a vapor-liquid separator; The inlet of the vapor-liquid separator is connected to the outlet of the evaporator, the outlet of the vapor-liquid separator is connected to the inlet of the first compressor, and the oil outlet of the vapor-liquid separator is connected to the inlet of the second bypass line; The vapor-liquid separator is used to separate the refrigeration oil and refrigerant output by the evaporator, transport the separated refrigerant to the first compressor, and transport the separated refrigeration oil to the second bypass pipeline; The system further includes a second solenoid valve, which is disposed on the second bypass line; The device comprises: An operating time acquisition module is used to obtain the operating time of the refrigeration equipment and determine whether the operating time is greater than a preset first operating time threshold; a first solenoid valve control module, configured to open the first solenoid valve to transfer the high-temperature gaseous refrigerant at the outlet of the first compressor to the evaporator if the operating time is greater than a preset first operating time threshold; The first solenoid valve control module is used for: The first solenoid valve is opened for a preset number of times in succession, wherein each opening time of the first solenoid valve is a preset opening time, and a preset interval time is left between two adjacent opening operations; The device further comprises: The second solenoid valve control module is used to determine whether the operating time is greater than a preset second operating time threshold; if the operating time is greater than the preset second operating time threshold, the second solenoid valve is opened to transport the refrigeration oil output by the evaporator to the first compressor.

5. A computer device, characterized in that: The computer device includes a processor and a memory, wherein the memory stores at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by the processor to implement the oil return control method according to any one of claims 1 to 2.

6. A computer-readable storage medium, characterized in that The readable storage medium stores at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by the processor to implement the oil return control method according to any one of claims 1 to 2.

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