A static oil return system for a refrigeration device, a refrigeration device, and an oil return control method

Abstract

The present invention provides a static oil return system for a refrigeration device, a refrigeration device and an oil return control method. The system includes a first compressor, an oil separator, a condensing evaporator, a first throttling element and an evaporator connected in sequence, and the evaporator is connected to the first compressor; the system further includes a storage tank separator and a secondary oil return channel. The first throttling element includes a first throttling section and a second throttling section; the separator inlet of the storage tank separator is connected to the outlet of the first throttling section, the separator outlet of the storage tank separator is connected to the inlet of the second throttling section, and the oil outlet of the storage tank separator is connected to the oil return port of the first compressor. The system provided by the present invention can solve the problem that the return of the refrigeration oil is difficult due to the poor fluidity, prevent the accumulation of the refrigeration oil in the evaporator, thereby avoiding the decrease of the heat exchange efficiency of the evaporator, alleviating the problem of the reduction of the refrigeration oil circulating between the compressor and the oil separator, ensuring the lubrication of the compressor, and reducing the wear of the cylinder.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration, and particularly to a static oil return system for a refrigeration device, a refrigeration device, and an oil return control method. Background Art

[0002] During the refrigeration process of devices such as refrigerators, due to the fact that the oil separation efficiency of the oil separator cannot reach 100%, a small amount of refrigerant oil will enter the circulation of the refrigeration system. After long-term operation, there will be an accumulation of refrigerant oil in the refrigeration pipeline. On the evaporator side, due to the temperature being lower than the pour point of the refrigerant oil, the viscosity of the refrigerant oil increases and its fluidity becomes worse, and the accumulation phenomenon is more serious. On the one hand, the long-term retention of refrigerant oil in the evaporator pipeline will affect the heat exchange effect of the evaporator, reduce the refrigeration capacity of the system, and cause the temperature inside the refrigerator not to reach the target temperature. On the other hand, the retention of refrigerant oil in the evaporator pipeline will also reduce the refrigerant oil circulation volume, resulting in a decrease in the oil return amount of the compressor, a deterioration in the lubrication effect, and the compressor is prone to damage during long-term operation. Summary of the Invention

[0003] To solve the problem that the existing refrigerant and refrigerant oil cannot be completely separated, the present application provides a static oil return system for a refrigeration device, a refrigeration device, and an oil return control method, which can avoid the situation of oil accumulation in the evaporator and oil shortage in the compressor of the refrigeration device.

[0004] On the one hand, a static oil return system for a refrigeration device is provided. The system includes a first compressor, an oil separator, a condensation evaporator, a first throttling element, and an evaporator connected in sequence, and the evaporator is connected to the first compressor; the system includes a storage tank separator and a secondary oil return channel, and the first throttling element includes a first throttling section and a second throttling section;

[0005] The separator inlet of the storage tank separator is connected to the outlet of the first throttling section, the separator outlet of the storage tank separator is connected to the inlet of the second throttling section, and the oil outlet of the storage tank separator is connected to the oil return port of the first compressor;

[0006] The storage tank separator is used to separate the refrigerant and refrigerant oil mixture flowing out of the first throttling section, so that the separated refrigerant enters the second throttling section through the separator outlet, and the separated refrigerant oil enters the first compressor through the oil outlet.

[0007] In some embodiments, the oil outlet of the storage tank separator is connected to the oil return port of the compressor through a solenoid valve, and the solenoid valve is used to allow the separated refrigerant oil to enter the compressor when it is opened.

[0008] In some embodiments, the storage tank separator includes: a tank body, a plurality of partition plates, and at least one oil collection bag;

[0009] The partition is a vertical structure disposed parallel inside the tank body, and each partition does not partition the tank body; the partitions connected to the top of the tank body and those connected to the bottom of the tank body are arranged alternately;

[0010] The connection line between the separator outlet and the separator inlet is perpendicular to the partition;

[0011] The oil collecting pocket is disposed at the bottom of the tank body and is connected to the oil outlet;

[0012] The partition is used to promote the separation of the refrigeration oil and the refrigerant, and the oil collecting pocket is used to collect the separated refrigeration oil.

[0013] In some embodiments, the oil collecting pocket includes a float valve, and the density of the float valve is less than the pour point density of the refrigeration oil and greater than the density of the refrigerant;

[0014] The float valve opens the oil outlet when floating and closes the oil outlet when not floating.

[0015] In some embodiments, the oil collecting pocket includes a liquid level sensor and an oil outlet valve;

[0016] The liquid level sensor is used to obtain the liquid level information in the oil collecting pocket;

[0017] The oil outlet valve is used to open when the liquid level information reaches a preset threshold.

[0018] In some embodiments, the system further includes a second compressor, a condenser, and a second throttling element connected in sequence;

[0019] The output end of the second throttling element is connected to the second compressor through the condensation evaporator.

[0020] On the other hand, a refrigeration device is provided, and the refrigeration device includes the refrigeration device static oil return system as described above.

[0021] On the other hand, an oil return control method is provided. The oil outlet of the storage tank separator is connected to the oil return port of the oil separator through an electromagnetic valve. The method includes:

[0022] Obtain the running time of the refrigeration device, and determine whether the running time is greater than a preset running time threshold;

[0023] If the running time is greater than the preset running time threshold, open the electromagnetic valve to enable the separated refrigeration oil to enter the compressor.

[0024] In some embodiments, the opening the electromagnetic valve to enable the separated refrigeration oil to enter the compressor includes:

[0025] The electromagnetic valve is opened a preset number of consecutive times, and the opening time of the electromagnetic valve each time is a preset opening duration, with a preset interval duration between adjacent two opening operations.

[0026] On the other hand, an oil return control device is provided, and the device includes:

[0027] An operating time acquisition module, configured to acquire the operating time of the refrigeration device and determine whether the operating time is greater than a preset operating time threshold;

[0028] An electromagnetic valve opening module, configured to open the electromagnetic valve to enable the separated refrigeration oil to enter the compressor if the operating time is greater than the preset operating time threshold.

[0029] In some embodiments, the electromagnetic valve opening module is specifically configured to:

[0030] The electromagnetic valve is opened a preset number of consecutive times, and the opening time of the electromagnetic valve each time is a preset opening duration, with a preset interval duration between adjacent two opening operations.

[0031] On the other hand, a computer device is provided. The computer device includes a processor and a memory. At least one instruction, at least one program, a code set or an instruction set is stored in the memory. The processor can load and execute at least one instruction, at least one program, the code set or the instruction set to implement the oil return control method provided in the embodiments of the above application.

[0032] On the other hand, a computer-readable storage medium is provided. At least one instruction, at least one program, a code set or an instruction set is stored in the readable storage medium. The processor can load and execute at least one instruction, at least one program, the code set or the instruction set to implement the oil return control method provided in the embodiments of the present application above.

[0033] On the other hand, a computer program product or a computer program is provided. The computer program product or the computer program includes computer program instructions, and the computer program instructions are stored in a computer-readable storage medium. The processor reads the computer instructions from the computer-readable storage medium and executes the computer instructions, so that the computer device executes the oil return control method described in any one of the above embodiments.

[0034] The beneficial effects brought by the technical solution provided in this application at least include: The embodiments of the present invention provide a static oil return system for a refrigeration device, a refrigeration device, and an oil return control method. The system includes a first compressor, an oil separator, a condensing evaporator, a first throttling element, and an evaporator connected in sequence, and the evaporator is connected to the first compressor; the system further includes a storage tank separator and a secondary oil return channel. The first throttling element includes a first throttling section and a second throttling section; the separator inlet of the storage tank separator is connected to the outlet of the first throttling section, the separator outlet of the storage tank separator is connected to the inlet of the second throttling section, and the oil outlet of the storage tank separator is connected to the oil return port of the first compressor. The system provided by the embodiments of the present invention can solve the problem that it is difficult to return oil due to the poor fluidity of the refrigeration oil, prevent the accumulation of refrigeration oil in the evaporator, thereby avoiding the decline of the heat exchange efficiency of the evaporator, alleviate the problem of the reduction of the refrigeration oil circulating between the compressor and the oil separator, ensure that the refrigeration oil circulation volume of the compressor always meets the requirements, ensure the lubrication of the compressor, and reduce the cylinder wear of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 FIG. 9 shows a schematic structural diagram of a static oil return system for a refrigeration device provided by an exemplary embodiment of the present application;

[0037] Figure 2 FIG. 13 shows a schematic structural diagram of a storage tank separator in a static oil return system for a refrigeration device provided by an exemplary embodiment of the present application;

[0038] Figure 3 FIG. 17 shows a schematic flow chart of the implementation of an oil return control method provided by an exemplary embodiment of the present application;

[0039] Figure 4 FIG. 21 shows a schematic flow chart of the implementation of an oil return control method provided by an exemplary embodiment of the present application;

[0040] Figure 5 FIG. 25 shows a schematic structural diagram of an oil return control device provided by an exemplary embodiment of the present application;

[0041] Figure 6 FIG. 29 shows a schematic structural diagram of a computer device corresponding to an oil return control method provided by an exemplary embodiment of the present application.

[0042] In the figure, 1 is a low-temperature stage compressor, 2 is an oil separator, 3 is an evaporator, 41 is the first stage of the low-temperature capillary tube, 42 is the second stage of the low-temperature capillary tube, 5 is a condensing evaporator, 6 is a storage tank separator, 7 is a solenoid valve, 8 is a high-temperature stage compressor, 9 is a high-temperature capillary tube, 10 is a condenser; A is the separator inlet, B is the separator outlet, and C is the oil outlet. Specific Embodiment

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0044] The refrigeration equipment static oil return system provided by this application can solve the problems of oil accumulation in the evaporator and oil shortage in the compressor.

[0045] Embodiment 1

[0046] Figure 1 The figure shows a schematic structural diagram of a refrigeration equipment static oil return system provided by an embodiment of the present invention.

[0047] The system provided by the embodiment of the present invention includes a first compressor, an oil separator, a condensing evaporator, a first throttling element, and an evaporator connected in sequence, and the evaporator is connected to the first compressor; the system further includes a storage tank separator and a secondary oil return channel, and the first throttling element includes a first throttling section and a second throttling section;

[0048] The separator inlet of the storage tank separator is connected to the outlet of the first throttling section, the separator outlet of the storage tank separator is connected to the inlet of the second throttling section, and the oil outlet of the storage tank separator is connected to the oil return port of the first compressor;

[0049] The storage tank separator is used to separate the refrigerant and refrigerant oil mixture flowing out of the first throttling section, so that the separated refrigerant enters the second throttling section through the separator outlet, and the separated refrigerant oil enters the first compressor through the oil outlet.

[0050] In a specific example, the first compressor is a low-temperature stage compressor, the first throttling section is the first stage of the low-temperature capillary tube, and the second throttling section is the second stage of the low-temperature capillary tube.

[0051] See Figure 1 , Figure 1 In the figure, 1 is a low-temperature stage compressor, 2 is an oil separator, 3 is an evaporator, 41 is the first stage of the low-temperature capillary tube, 42 is the second stage of the low-temperature capillary tube, 5 is a condensing evaporator, 6 is a storage tank separator, 7 is a solenoid valve, 8 is a high-temperature stage compressor, 9 is a high-temperature capillary tube, 10 is a condenser; A is the separator inlet, B is the separator outlet, and C is the oil outlet.

[0052] Among them, the oil return passage from the oil separator to the oil return port of the first compressor forms the main oil return passage, which sends the refrigerating oil separated by the oil separator back to the compressor.

[0053] The oil return passage from the storage tank separator to the oil return port of the first compressor forms the secondary oil return passage, which sends the refrigerating oil separated by the storage tank separator back to the compressor.

[0054] In the operation of a traditional refrigeration system, when the refrigerant of the low-temperature stage refrigeration system is transported to the low-temperature stage condensation evaporation passage by the low-temperature stage compressor, the refrigerating oil inside the compressor will generate oil foam due to the operation and high temperature of the compressor. Since the oil separator cannot completely separate the refrigerating oil, the oil foam will be carried into the refrigeration system along with the refrigerant and circulate. There will always be a small part of the refrigerating oil entering the low-temperature section along with the refrigerant. In the throttling element, during the process of the refrigerant changing from gaseous to liquid and cooling down, the temperature drops below the pour point of the refrigerating oil, for example, below -50°C. The fluidity of the refrigerating oil becomes poor and it will aggregate to form fine oil droplets. The retention of the oil droplets in the system behind the oil separator will cause the problems of oil accumulation in the evaporator and oil shortage in the compressor. The accumulation of refrigerating oil in the evaporator will affect the uniformity of the temperature inside the refrigeration equipment cabinet.

[0055] In the embodiment provided by the present invention, after the mixture of the refrigerant and the refrigerating oil passes through the first throttling section, the temperature drops below the pour point of the refrigerating oil, and the refrigerating oil aggregates to form fine oil droplets. After the mixture enters the storage tank separator, since the fluidity of the refrigerating oil becomes poor at this time and the density of the refrigerating oil is different from that of the refrigerant, the mixture will form a certain blurred stratification, and the refrigerating oil accumulates at the bottom of the storage tank separator. When the low-temperature compressor is in operation and the solenoid valve is opened, the refrigerating oil at the bottom of the storage tank separator is transported back to the compressor through the above-mentioned secondary oil return passage to re-participate in the main oil return cycle, ensuring the stable oil return amount of the compressor and avoiding the cylinder wear of the compressor.

[0056] In some embodiments, the first throttling section can control the temperature of the mixture entering the storage tank, promoting the separation of the refrigerant and the refrigerating oil in the storage tank separator. The separated refrigerating oil returns to the compressor through the solenoid valve, thus solving the problems of oil accumulation in the evaporator and oil shortage in the compressor. The separated refrigerant enters the second throttling section to further reduce the pressure to meet the requirements for entering the evaporator.

[0057] In some embodiments, the oil outlet of the storage tank separator is connected to the oil return port of the compressor through a solenoid valve, and the solenoid valve is used to allow the separated refrigerating oil to enter the compressor when it is opened.

[0058] Specifically, the oil return passage from the storage tank separator through the solenoid valve to the oil return port of the first compressor forms the secondary oil return passage, which sends the refrigerating oil separated by the storage tank separator back to the compressor.

[0059] The above system is a low-temperature refrigeration system. In some embodiments, the system provided by the present invention further 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;

[0060] The output end of the second throttling element is connected to the second compressor through the condensation evaporator.

[0061] Optionally, the static oil return system of the refrigeration equipment provided by the embodiments of the present invention can be applied to the low-temperature refrigeration part of a cascade refrigeration system.

[0062] In a specific example, the second compressor is a high-temperature compressor, and the second throttling element is a high-temperature condensation evaporation channel.

[0063] The static oil return system of the refrigeration equipment provided by the embodiments of the present invention can solve the problem that the return of the refrigeration oil is difficult due to the poor fluidity. By regularly transporting the accumulated refrigeration oil back to the main oil return cycle, the possibility of the refrigeration oil entering the evaporator can be reduced, preventing the accumulation of the refrigeration oil in the evaporator, thereby avoiding the decline of the heat exchange efficiency of the evaporator and stabilizing the maximum heat exchange efficiency of the evaporator. On the other hand, by preventing the accumulation of the refrigeration oil in the evaporator, the problem of the reduction of the refrigeration oil circulating between the compressor and the oil separator can be alleviated, ensuring that the amount of the refrigeration oil circulated by the compressor always meets the requirements, guaranteeing the lubrication of the compressor, and reducing the cylinder wear of the compressor.

[0064] Embodiment 2

[0065] Figure 2 Shows a schematic structural diagram of a storage tank separator in the static oil return system of the refrigeration equipment provided by the embodiments of the present invention.

[0066] See Figure 2 , the storage tank separator includes: a tank body, a plurality of partition plates, and at least one oil collecting bag;

[0067] The partition plates are vertical structures arranged in parallel inside the tank body, and none of the partition plates separates the tank body; the partition plates connected to the top of the tank body and the partition plates connected to the bottom of the tank body are arranged alternately;

[0068] The connection line between the separator outlet and the separator inlet is perpendicular to the partition plates;

[0069] The oil collecting bag is arranged at the bottom of the tank body and is connected to the oil outlet;

[0070] The partition plates are used to promote the separation of the refrigeration oil and the refrigerant, and the oil collecting bag is used to collect the separated refrigeration oil.

[0071] In a specific example, the separator inlet and the separator outlet are horizontally arranged and located in the same plane.

[0072] The partition is a vertical structure disposed inside the tank body, and each partition does not partition the tank body; the partitions connected to the top of the tank body and the partitions connected to the bottom of the tank body are arranged alternately;

[0073] In some embodiments, the partition is used to extend the channel length between the separator inlet and the separator outlet.

[0074] Specifically, the structure of the storage tank separator adopts a multi-partition structure with one inlet and two outlets. During operation, the dynamic static method of overflowing the partition is used to separate the refrigeration oil and the refrigerant under the action of gravity, which can reduce the overall disturbance in the tank and increase the local disturbance so that the refrigeration oils collide more with each other and aggregate faster. The aggregated oil droplets sink under the action of gravity, and a good separation effect can be achieved.

[0075] In some embodiments, the oil collecting bag includes a float valve, and the density of the float valve is less than the pour point density of the refrigeration oil and greater than the density of the refrigerant;

[0076] The float valve opens the oil outlet when floating and closes the oil outlet when not floating.

[0077] Specifically, when the liquid level of the refrigeration oil in the oil collecting bag is high enough, the float valve can be opened to allow the refrigeration oil to enter the secondary oil return channel.

[0078] In the storage tank separator, the refrigerant and the lubricating oil can be separated into layers by using the density difference, and the separated refrigeration oil can be transported back to the compressor through the solenoid valve, thereby reducing the refrigeration oil entering the evaporator and maintaining the circulating oil volume of the compressor.

[0079] In a specific example, after the refrigerant passes through the first-stage throttling element, the temperature of the refrigerant and the refrigeration oil reaches below the pour point of the refrigeration oil, making the fluidity of the refrigeration oil poor. The liquid refrigerant and the refrigeration oil flow in the bypass flow path formed by the staggered partitions in the separator, and the refrigerant flows out of the separator outlet and enters the second-stage throttling element. At this time, the refrigeration oil in the refrigerant is effectively separated and can enter the evaporator after secondary throttling. The refrigeration oil will aggregate in the dynamic static area at the bottom of the separator and enter the oil collecting bag. When the refrigeration oil in the oil collecting bag aggregates enough, the float valve can be automatically opened to allow the refrigeration oil to enter the secondary oil return channel, and the refrigeration oil accumulated in the secondary oil return channel will be led back to the compressor when the solenoid valve is opened.

[0080] Due to the pressure difference before and after the float valve, the float valve will be in a closed state when the solenoid valve is opened, and no liquid hammer phenomenon will occur.

[0081] In some embodiments, the oil collecting bag includes a liquid level sensor and an oil outlet valve;

[0082] The liquid level sensor is used to obtain the liquid level information in the oil collection package;

[0083] The oil outlet valve is used to open when the liquid level information reaches a preset threshold.

[0084] In some embodiments, the structure of the storage tank separator may further include a vertical separation tank.

[0085] In summary, the refrigeration equipment static oil return system provided by the embodiments of the present invention can maintain the heat exchange efficiency of the refrigerator evaporator by improving the oil return situation of the refrigerating oil, avoid the risk of temperature rise in the box due to the change of the heat exchange efficiency of the heat exchanger after long-term operation, and ensure the safety of the stored items in the box. It can also reduce the fluctuation of the circulating oil volume of the system refrigerating oil, delay the running wear of the compressor, and improve the service life of the compressor. Further, the system provided by the embodiments of the present invention can open the solenoid valve when the machine stops to quickly balance the pressure on the suction and exhaust sides and relieve the high pressure caused by the evaporation of the refrigerant on the low-temperature side.

[0086] Embodiment III

[0087] The present invention provides a refrigeration equipment, and the refrigeration equipment includes the refrigeration equipment static oil return system as described above.

[0088] In a specific example, the refrigeration equipment includes a low-temperature refrigerator.

[0089] Embodiment IV

[0090] Figure 3 The implementation flow schematic diagram of the oil return control method provided by the embodiments of the present invention is shown.

[0091] See Figure 3 , the oil return control method provided by the embodiments of the present invention is applied to the refrigeration equipment static oil return system, the oil outlet of the storage tank separator is connected to the oil return port of the oil separator through a solenoid valve, and the method includes Step 101 to Step 102.

[0092] Step 101: Obtain the running time of the refrigeration equipment, and judge whether the running time is greater than a preset running time threshold.

[0093] Step 102: If the running time is greater than the preset running time threshold, open the solenoid valve to enable the separated refrigerating oil to enter the compressor.

[0094] Since the storage tank separator will continuously separate the refrigerating oil automatically when the refrigeration equipment is running, the solenoid valve can be opened after the equipment runs for a certain time to transport the separated refrigerating oil back to the first compressor.

[0095] In some embodiments, in step 102, opening the solenoid valve to allow the separated refrigerant oil to enter the compressor includes:

[0096] Opening the solenoid valve continuously for a preset number of times, with each opening time of the solenoid valve being a preset opening duration, and there being a preset interval duration between two adjacent opening operations.

[0097] To convey the refrigerant oil back to the compressor as thoroughly as possible without affecting the normal circulation of the refrigerant, the solenoid valve can be opened multiple times to convey the refrigerant oil.

[0098] The oil return control method provided by the embodiments of the present invention can reduce the possibility of refrigerant oil entering the evaporator by regularly conveying the accumulated refrigerant oil back to the main oil return cycle, thereby avoiding a decrease in the heat exchange efficiency of the evaporator and stabilizing the maximum heat exchange efficiency of the evaporator. On the other hand, it can alleviate the problem of reduced refrigerant oil circulating between the compressor and the oil separator, ensure the lubrication of the compressor, and reduce the cylinder wear of the compressor.

[0099] Embodiment Five

[0100] Figure 4 Shows another implementation flow schematic diagram of the oil return control method provided by the embodiments of the present invention.

[0101] See Figure 4 , in a specific example, the implementation process of the oil return control method provided by the embodiments of the present invention is as follows.

[0102] First, detect the operating state of the device and the operating time T0, and determine whether the operating time T0 is greater than a preset operating time threshold t0.

[0103] If the device is not in the operating state or the operating time is less than the time threshold, repeat the detection.

[0104] If the device is in the operating state and the operating time T0 is greater than the preset time threshold t0, open the solenoid valve and record the duration T1 when the solenoid valve is opened.

[0105] Opening the solenoid valve is to open the oil return channel. This process can convey the refrigerant oil accumulated in the pipeline back to the compressor. Due to the refrigerant pressure in the upper part of the float valve in the liquid storage tank and the low suction pressure at the lower compressor oil return port, neither the refrigerant oil nor the refrigerant at the oil collection package will be brought into the compressor oil chamber, and there will be no liquid hammer or the refrigerant oil droplets in the compressor being carried out due to flashing in the compressor, nor will it cause the compressor to lack oil.

[0106] Determine whether the opening time T1 of the solenoid valve reaches the preset opening time threshold t1. When the opening time T1 of the solenoid valve reaches the preset opening time threshold t1, close the solenoid valve. After closing the solenoid valve, after an interval of t3, open the solenoid valve again to open the oil return passage. Similarly, the opening duration of the solenoid valve is t1.

[0107] Count the number of times the solenoid valve is opened, and the quantity is N1. When the number of times the solenoid valve is opened reaches the preset number n1, end this static oil return control process.

[0108] 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 oil return condition of the refrigerant oil, avoid the risk of the temperature inside the box rising due to the change of the heat exchange efficiency of the heat exchanger after long-term operation, and ensure the safety of the stored items inside the box. It can also reduce the fluctuation of the circulating oil volume of the system refrigerant oil, delay the running wear of the compressor, and improve the service life of the compressor.

[0109] Embodiment Six

[0110] Figure 5 Shows a schematic structural diagram of the oil return control device provided by the embodiments of the present invention.

[0111] See Figure 5 , the oil return control device provided by the embodiments of the present invention may include:

[0112] An operating time acquisition module, configured to acquire the operating time of the refrigeration device and determine whether the operating time is greater than a preset operating time threshold;

[0113] A solenoid valve opening module, configured to open the solenoid valve to enable the separated refrigerant oil to enter the compressor if the operating time is greater than the preset operating time threshold.

[0114] In some embodiments, the solenoid valve opening module is specifically configured to:

[0115] Open the solenoid valve continuously for a preset number of times, and the opening time of the solenoid valve each time is a preset opening duration, and there is a preset interval duration between adjacent two opening operations.

[0116] In summary, the device provided by the embodiments of the present invention can reduce the possibility of refrigerant oil entering the evaporator by regularly transporting the accumulated refrigerant oil back to the main oil return cycle, thereby avoiding the decline of the heat exchange efficiency of the evaporator and stabilizing the maximum heat exchange efficiency of the evaporator. On the other hand, it can alleviate the problem of the reduction of the refrigerant oil circulating between the compressor and the oil separator, ensure the lubrication of the compressor, and reduce the cylinder wear of the compressor.

[0117] Embodiment Seven

[0118] Figure 6The structural schematic diagram of a computer device provided by an exemplary embodiment of the present application is shown. The computer device includes:

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

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

[0121] A memory 304 is connected to the processor 301 through a bus 305.

[0122] The memory 304 can be used to store at least one instruction, and the processor 301 is 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 can understand that Figure 4 This is only an example of a computer device and does not constitute a limitation on the computer device. It may include more or fewer components than shown in the figure, or combine some components, or different components. For example, the computer device may further include a network access device, etc.

[0124] The so-called processor 301 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0125] The memory 304 may be an internal storage unit of the computer device, such as the 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, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the computer device. Further, the memory 304 may also include both the internal storage unit and the external storage device of the computer 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 the data that has been output or will be output.

[0126] Embodiment VIII

[0127] The embodiment of the present application further provides a computer-readable storage medium, in which at least one instruction, at least one segment of program, a code set or an instruction set is stored, and is loaded and executed by a processor to implement the above-mentioned oil return control method.

[0128] Optionally, the computer-readable storage medium may include: Read Only Memory (ROM), Random Access Memory (RAM), Solid State Drives (SSD) or optical discs, etc. Among them, the random access memory may include Resistance Random Access Memory (ReRAM) and Dynamic Random Access Memory (DRAM).

[0129] Embodiment IX

[0130] The present application further provides a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the oil return control method described in any one of the above embodiments.

[0131] The serial numbers of the embodiments of the present application above are only for description and do not represent the advantages and disadvantages of the implementation.

[0132] Those of ordinary skill in the art can understand that all or part of the steps to implement the above embodiments can be completed by hardware, or can be completed by instructing relevant hardware through a program. The program can be stored in a computer-readable storage medium. The storage medium mentioned above can be a read-only memory, a magnetic disk, an optical disk, etc. Those skilled in the art can clearly understand that for the convenience and conciseness of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, 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. Each functional unit and module in the embodiment can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above 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 each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of the present application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0133] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

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

[0135] Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can 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, the computer-readable medium does not include electrical 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 it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A static oil return system for a refrigeration device, the system comprising a first compressor, an oil separator, a condensing evaporator, a first throttling element, and an evaporator connected in sequence, the evaporator being connected to the first compressor; characterized in that, The system includes a storage tank separator and a secondary oil return passage, and the first throttling element includes a first throttling section and a second throttling section; The separator inlet of the storage tank separator is connected to the outlet of the first throttling section, the separator outlet of the storage tank separator is connected to the inlet of the second throttling section, and the oil outlet of the storage tank separator is connected to the oil return port of the first compressor; The storage tank separator is used to separate the refrigerant and refrigerant oil mixture flowing out of the first throttling section, so that the separated refrigerant enters the second throttling section through the separator outlet, and the separated refrigerant oil enters the first compressor through the oil outlet; The oil outlet of the storage tank separator is connected to the oil return port of the compressor through a solenoid valve, and the solenoid valve is used to allow the separated refrigerant oil to enter the compressor when it is opened; The storage tank separator includes: a tank body, a plurality of partition plates and at least one oil collecting package; The partition plates are vertical structures arranged in parallel inside the tank body, and each partition plate does not partition the tank body; the partition plates connected to the top of the tank body and the partition plates connected to the bottom of the tank body are arranged alternately; The connection line between the separator outlet and the separator inlet is perpendicular to the partition plate; The oil collecting package is arranged at the bottom of the tank body and is connected to the oil outlet; The partition plates are used to promote the separation of the refrigerant oil and the refrigerant, and the oil collecting package is used to collect the separated refrigerant oil; The oil collecting package includes a float valve or a liquid level sensor and an oil outlet valve; The density of the float valve is less than the pour point density of the refrigerant oil and greater than the density of the refrigerant; The float valve opens the oil outlet when it floats and closes the oil outlet when it does not float; The liquid level sensor is used to obtain the liquid level information in the oil collecting package; The oil outlet valve is used to open when the liquid level information reaches a preset threshold.

2. The system according to claim 1, wherein 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 condensation evaporator.

3. A refrigeration device, characterized in that, The refrigeration device includes the refrigeration device static oil return system according to any one of claims 1-2.

4. A return oil control method is applied to the static return oil system of the refrigeration equipment according to any one of claims 1-2, characterized in that, The oil outlet of the storage tank separator is connected to the oil return port of the oil separator through a solenoid valve, and the method includes: Obtaining the operating time of the refrigeration device and determining whether the operating time is greater than a preset operating time threshold; If the operating time is greater than the preset operating time threshold, the solenoid valve is opened to allow the separated refrigerant oil to enter the compressor.

5. The oil return control method according to claim 4, characterized in that The opening of the solenoid valve to allow the separated refrigerant oil to enter the compressor includes: The solenoid valve is continuously opened a preset number of times, and the opening time of the solenoid valve each time is a preset opening duration, and the interval between adjacent two opening operations is a preset interval duration.

6. An oil return control device, characterized in that, Applicable to the method according to any one of claims 4-5, the device includes: An operating time acquisition module, configured to acquire the operating time of the refrigeration device and determine whether the operating time is greater than a preset operating time threshold; A solenoid valve opening module, configured to open the solenoid valve to allow the separated refrigerant oil to enter the compressor if the operating time is greater than a preset operating time threshold.

7. A computer device, characterized in that, The computer device includes a processor and a memory. At least one instruction, at least one program, a code set or an instruction set is stored in the memory, and the at least one instruction, at least one program, the code set or the instruction set is loaded and executed by the processor to implement the oil return control method as described in claim 4.

8. A computer-readable storage medium, characterized in that, At least one instruction, at least one program, a code set or an instruction set is stored in the readable storage medium, and the at least one instruction, at least one program, the code set or the instruction set is loaded and executed by a processor to implement the oil return control method as described in claim 4.

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