Refrigeration system, control method and device for refrigeration equipment, and refrigeration equipment

Abstract

This application relates to the field of refrigeration equipment technology, and discloses a refrigeration system, control method and device, and refrigeration equipment for use in refrigeration equipment. The refrigeration system includes: a refrigeration circuit consisting of a compressor, a condenser and an evaporator connected in sequence; a liquid receiver, disposed in the connection circuit between the compressor and the evaporator, for storing excess refrigerant during the refrigeration cycle; a liquid level detection device disposed in the liquid receiver for detecting the liquid level of the refrigerant in the liquid receiver; and a reflux valve, through which the liquid receiver is connected to the inlet of the evaporator; wherein, when the liquid level detection device detects that the liquid level of the refrigerant in the liquid receiver has reached a set liquid level, the reflux valve is controlled to open, returning the refrigerant stored in the liquid receiver to the evaporator. This application can reduce the risk of liquid slugging in the compressor and improve the temperature rise rate of the refrigeration equipment.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, such as a refrigeration system, control method and device, and refrigeration equipment for use in refrigeration equipment. Background Technology

[0002] In related technologies, in order to solve the liquid slugging problem of compressors, a liquid receiver is usually set up in the connection circuit between the compressor and the evaporator to collect excess refrigerant, and then the excess refrigerant is evaporated by capillary heat exchange or heating.

[0003] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0004] Even when the refrigerant stored in the receiver reaches a certain level, some excess refrigerant will still flow into the compressor, causing liquid slugging. Furthermore, evaporating the refrigerant in the receiver reduces the amount of refrigerant circulating throughout the refrigeration system, resulting in a slower temperature rise of the refrigeration equipment.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a refrigeration system, control method and apparatus, and refrigeration equipment for use in refrigeration equipment, which can reduce the risk of liquid slugging in the compressor and improve the temperature pulling speed of the refrigeration equipment.

[0008] In some embodiments, a refrigeration system for a refrigeration device includes: a refrigeration circuit consisting of a compressor, a condenser, and an evaporator connected in sequence; a liquid receiver disposed in the connection circuit between the compressor and the evaporator for storing excess refrigerant during the refrigeration cycle; a liquid level detection device disposed in the liquid receiver for detecting the liquid level of the refrigerant in the liquid receiver; and a reflux valve, through which the liquid receiver is connected to the inlet of the evaporator; wherein, when the liquid level detection device detects that the liquid level of the refrigerant in the liquid receiver has reached a set liquid level, the reflux valve is controlled to open, and the refrigerant stored in the liquid receiver is returned to the evaporator.

[0009] Optionally, the refrigeration system also includes a one-way valve, located in the connection loop between the return valve and the evaporator, to prevent refrigerant in the evaporator from flowing back into the receiver.

[0010] Optionally, the refrigeration system further includes: a dryer filter, disposed in the connecting loop between the condenser and the evaporator, for absorbing moisture in the refrigerant; and a capillary tube, one end connected to the outlet of the dryer filter and the other end connected to the inlet of the evaporator, for throttling and reducing the pressure of the refrigerant flowing out of the condenser.

[0011] Optionally, the angle between the pipe where the reflux valve is located and the evaporator inlet pipe is greater than or equal to 5 degrees and less than or equal to 175 degrees.

[0012] In some embodiments, a control method for a refrigeration device is applied to a refrigeration device equipped with a refrigeration system as described above. The control method includes: confirming the operating status of the compressor; when the compressor is in operation, obtaining the current liquid level of the refrigerant in the receiver; and when the current liquid level reaches a set liquid level, controlling the reflux valve to open for a set duration.

[0013] Optionally, the control method further includes: controlling the reflux valve to open for a set duration after the compressor stops.

[0014] Optionally, the control method further includes: detecting the current temperature pulling speed in the refrigeration equipment; if the current temperature pulling speed is less than the set speed, determining the target duration for which the reflux valve needs to be opened based on the current temperature pulling speed; and controlling the target duration for which the reflux valve is opened.

[0015] Optionally, the target duration for which the reflux valve needs to be opened is determined based on the current temperature-up rate, including: calculating the speed difference between the set speed and the current temperature-up rate; determining the amount of refrigerant to be added to the evaporator based on the speed difference; and determining the target duration based on the amount of refrigerant added.

[0016] In some embodiments, a control device for a refrigeration device includes a processor and a memory storing program instructions, the processor being configured to execute the control method for a refrigeration device as described above.

[0017] In some embodiments, a refrigeration device includes: a device body; a refrigeration system for a refrigeration device as described above, disposed within the device body; and a control device for a refrigeration device as described above, electrically connected to the refrigeration system.

[0018] The refrigeration system, control method, apparatus, and refrigeration equipment provided in this disclosure can achieve the following technical effects:

[0019] In this embodiment, in a refrigeration circuit consisting of a compressor, a condenser, and an evaporator connected in sequence, a receiver-loaded liquid tank is provided on the connection between the compressor and the evaporator to store excess refrigerant during the refrigeration cycle. A liquid level detection device is installed in the receiver-loaded liquid tank, and another outlet of the receiver-loaded liquid tank is connected to the inlet of the evaporator via a reflux valve. Thus, when the liquid level detection device detects that the refrigerant level in the receiver-loaded liquid tank has reached a set level, the reflux valve can be opened to return the stored refrigerant to the evaporator. This prevents excess refrigerant from flowing into the compressor and increases the amount of refrigerant participating in the cycle in the evaporator. Therefore, this embodiment of the present disclosure can reduce the risk of liquid slugging in the compressor and improve the temperature rise rate of the refrigeration equipment.

[0020] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0022] Figure 1 This is a schematic diagram of a refrigeration system for a refrigeration device provided in an embodiment of this disclosure;

[0023] Figure 2 This is a schematic diagram of another refrigeration system for a refrigeration device provided in an embodiment of this disclosure;

[0024] Figure 3 This is a schematic diagram of another refrigeration system for a refrigeration device provided in an embodiment of this disclosure;

[0025] Figure 4 This is a schematic diagram of a refrigeration device provided in an embodiment of this disclosure;

[0026] Figure 5 This is a schematic diagram of a control method for a refrigeration device provided in an embodiment of this disclosure;

[0027] Figure 6 This is a schematic diagram of another control method for a refrigeration device provided in an embodiment of this disclosure;

[0028] Figure 7 This is a schematic diagram of a control device for a refrigeration equipment provided in an embodiment of this disclosure;

[0029] Figure 8 This is a schematic diagram of another control device for a refrigeration equipment provided in an embodiment of this disclosure.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100. Refrigeration systems used in refrigeration equipment;

[0032] 110. Refrigeration circuit; 111. Compressor; 112. Condenser; 113. Evaporator; 120. Liquid receiver; 121. Liquid level detection device; 130. Reflux valve; 140. Check valve; 150. Dryer filter; 160. Capillary tube. Detailed Implementation

[0033] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0034] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0035] Unless otherwise stated, the term "multiple" means two or more.

[0036] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0037] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0038] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0040] like Figure 1As shown in the embodiment of this disclosure, a refrigeration system 100 for refrigeration equipment includes: a refrigeration circuit 110, a liquid receiver 120, a liquid level detection device 121, and a reflux valve 130. The refrigeration circuit 110 is composed of a compressor 111, a condenser 112, and an evaporator 113 connected sequentially. The liquid receiver 120 is disposed in the connection circuit between the compressor 111 and the evaporator 113, and is used to store excess refrigerant during the refrigeration cycle. The liquid level detection device 121 is disposed within the liquid receiver 120 and is used to detect the liquid level of the refrigerant within the liquid receiver 120. The liquid receiver 120 is connected to the inlet of the evaporator 113 via the reflux valve 130. When the liquid level detection device 121 detects that the liquid level of the refrigerant in the liquid receiver 120 has reached a set liquid level, it controls the reflux valve 130 to open, allowing the refrigerant stored in the liquid receiver 120 to flow back into the evaporator 113.

[0041] Specifically, by setting a liquid receiver 120 in the connection circuit between the compressor 111 and the evaporator 113, excess refrigerant during the refrigeration cycle can be stored to prevent excess refrigerant from flowing into the compressor 111 and causing liquid slugging in the compressor 111.

[0042] Specifically, the receiver 120 is connected to the inlet of the evaporator 113 via a reflux valve 130. A level detection device 121 is installed inside the receiver 120 to detect the refrigerant level. When the level detection device 121 detects that the refrigerant level in the receiver 120 has reached a set level, the reflux valve 130 can be opened to allow the refrigerant stored in the receiver 120 to flow back into the evaporator 113. This prevents refrigerant that the receiver 120 cannot store from flowing into the compressor 111, which could cause liquid slugging in the compressor 111.

[0043] In this embodiment, in the refrigeration circuit 110 consisting of a compressor 111, a condenser 112, and an evaporator 113 connected in sequence, a receiver 120 for storing excess refrigerant during the refrigeration cycle is provided on the connection between the compressor 111 and the evaporator 113. A liquid level detection device 121 is installed in the receiver 120, and another outlet of the receiver 120 is connected to the inlet of the evaporator 113 via a return valve 130. Thus, when the liquid level detection device 121 detects that the refrigerant level in the receiver 120 has reached a set level, the return valve 130 can be opened to return the refrigerant stored in the receiver 120 to the evaporator 113. This avoids excess refrigerant flowing into the compressor 111 and increases the amount of refrigerant participating in the cycle in the evaporator 113. Therefore, this embodiment can reduce the risk of liquid slugging in the compressor 111 and improve the temperature rise rate of the refrigeration equipment.

[0044] like Figure 2As shown, in some embodiments, the refrigeration system 100 further includes a one-way valve 140. The one-way valve 140 is disposed in the connection loop between the return valve 130 and the evaporator 113 to prevent refrigerant in the evaporator 113 from flowing back into the receiver 120.

[0045] Specifically, by installing a one-way valve 140 in the connection circuit between the return valve 130 and the evaporator 113, when the return valve 130 is open, the refrigerant can flow smoothly through the one-way valve 140 into the evaporator 113, while the refrigerant cannot flow through the one-way valve 140 into the receiver 120. In this way, even if the return valve 130 malfunctions and is in a normally open state, it can prevent the refrigerant in the evaporator 113 from flowing back into the receiver 120.

[0046] In this embodiment, by setting a one-way valve 140 in the connection circuit between the reflux valve 130 and the evaporator 113, the refrigerant in the evaporator 113 is prevented from flowing back into the liquid receiver 120, thereby improving the reliability of the refrigeration system 100.

[0047] like Figure 3 As shown, in some embodiments, the refrigeration system 100 further includes a dryer filter 150 and a capillary tube 160. The dryer filter 150 is disposed in the connecting loop between the condenser 112 and the evaporator 113, and is used to absorb moisture in the refrigerant. One end of the capillary tube 160 is connected to the outlet of the dryer filter 150, and the other end is connected to the inlet of the evaporator 113, for throttling and reducing the pressure of the refrigerant flowing out of the condenser 112.

[0048] Specifically, by installing a dryer filter 150 in the connection loop between the condenser 112 and the evaporator 113 in the refrigeration circuit 110, which is composed of a compressor 111, a condenser 112 and an evaporator 113 connected in sequence, the dryer filter 150 has the following function:

[0049] First, the dryer filter 150 is filled with a desiccant (such as molecular sieves, activated alumina, or silica gel), which can efficiently adsorb residual moisture in the refrigeration system 100. By adsorbing moisture, the dryer filter 150 can prevent moisture from freezing at low temperatures, thus preventing ice blockage in the refrigeration system 100.

[0050] Secondly, moisture in the refrigeration system 100 may corrode metal components, generating corrosive acidic substances. The adsorption effect of the dryer filter 150 can effectively reduce the formation of these corrosive substances, thereby protecting the metal components of the refrigeration system 100 and extending its service life.

[0051] Third, the inlet of the dryer filter 150 is equipped with a coarse filter screen, which can initially intercept large particulate impurities in the refrigeration system 100, such as dust, metal shavings, and oxide scale generated during welding. In this way, the refrigerant flowing out of the dryer filter 150 will have higher purity, effectively avoiding blockage or damage to precision components such as the capillary tube 160 and valves in the refrigeration system 100.

[0052] Specifically, by providing a capillary tube 160 with one end connected to the outlet of the dryer filter 150 and the other end connected to the inlet of the evaporator 113, the following functions are achieved:

[0053] First, it causes the refrigerant to encounter greater resistance when flowing through the capillary tube 160, thereby achieving a throttling and pressure reduction effect. This results in the refrigerant having a lower pressure and temperature at the inlet of the evaporator 113, ensuring that the refrigerant can effectively absorb heat in the evaporator 113.

[0054] Secondly, the capillary tube 160 can regulate the refrigerant flow rate to ensure that the evaporator 113 maintains a reasonable temperature. If the refrigerant flow rate is too high, the temperature of the evaporator 113 will be too low, leading to a decrease in the efficiency of the refrigeration system 100 or icing of the evaporator 113. If the refrigerant flow rate is too low, the temperature of the evaporator 113 will be too high, affecting the cooling effect.

[0055] Third, because the capillary tube 160 is long and thin with a small aperture, when the compressor 111 stops, the capillary tube 160 can gradually release the pressure in the high-pressure line, so that the high-pressure line and the low-pressure line tend to reach a state of equilibrium.

[0056] In this embodiment, in the refrigeration circuit 110 formed by the compressor 111, condenser 112, and evaporator 113 connected in sequence, a dryer filter 150 and a capillary tube 160 are sequentially arranged on the connection circuit between the condenser 112 and the evaporator 113. This allows for the absorption of moisture from the refrigerant, throttling and reducing the pressure of the refrigerant flowing out of the condenser 112, and improving the reliability of the refrigeration system 100.

[0057] like Figure 3 As shown, in some embodiments, the angle between the pipe where the reflux valve 130 is located and the inlet pipe of the evaporator 113 is greater than or equal to 5 degrees and less than or equal to 175 degrees.

[0058] Specifically, by adjusting the angle between the pipe where the reflux valve 130 is located and the inlet pipe of the evaporator 113 ( Figure 3The angle α shown is limited to a range greater than or equal to 5 degrees and less than or equal to 175 degrees. When the return valve 130 is open, the refrigerant can flow smoothly into the evaporator 113 under its own gravity without the need for external force. Thus, there is no need for a separate power unit to discharge the refrigerant from the receiver 120 into the evaporator 113.

[0059] like Figure 4 As shown, the refrigeration device 400 provided in this embodiment includes: device body 410, refrigeration system 100 for refrigeration device as described above, and control device 700 (800) for refrigeration device.

[0060] Alternatively, the refrigeration equipment can be a refrigerator or a freezer. Figure 4 The image shows a case where the refrigeration equipment is a freezer.

[0061] Specifically, a refrigeration system 100 for refrigeration equipment is disposed in the housing body 410, and a control device 700 (800) for refrigeration equipment is electrically connected to the refrigeration system 100 for refrigeration equipment.

[0062] Optionally, the control device 800 for the refrigeration equipment includes a processor that can monitor the operating status of the compressor. When the compressor is running, the processor can obtain the current liquid level of the refrigerant in the receiver and determine whether the current liquid level has reached the set liquid level. When the current liquid level has reached the set liquid level, the processor can control the reflux valve to open for a set duration to discharge the refrigerant in the receiver into the evaporator.

[0063] In conjunction with the aforementioned refrigeration equipment, this disclosure provides a control method for refrigeration equipment, such as... Figure 5 As shown, the control method includes:

[0064] S501, the processor confirms the compressor's operating status.

[0065] Specifically, a current detection device and a voltage detection device are installed on the compressor, and these devices are electrically connected to the processor. The processor can determine the operating status of the compressor by acquiring the current and voltage detected by the current and voltage detection devices.

[0066] S502, the processor obtains the current liquid level of the refrigerant in the receiver while the compressor is running.

[0067] Specifically, the current liquid level of the refrigerant in the receiver is detected by a liquid level detection device installed inside the receiver.

[0068] Specifically, when the compressor is running, the refrigerant continuously circulates in the refrigeration circuit. In this situation, if the refrigerant level in the receiver exceeds a certain height, the refrigerant stored in the receiver will flow into the compressor, causing liquid slugging. Therefore, when the compressor is running, the current refrigerant level in the receiver is monitored to determine if there is a risk of compressor liquid slugging.

[0069] S503: When the current liquid level reaches the set liquid level, the processor controls the reflux valve to open for a set duration.

[0070] Specifically, if the current refrigerant level in the receiver reaches the set level, as the compressor continues to run, the refrigerant above the set level will flow back into the compressor, causing liquid slugging. Therefore, in this situation, it is necessary to control the reflux valve to open for a set duration to discharge the refrigerant from the receiver into the evaporator.

[0071] Optionally, the duration can be set to 10 to 15 seconds.

[0072] In this embodiment, when the compressor is running, if the liquid level detection device detects that the refrigerant level in the receiver has reached a set level, the return valve is opened to return the refrigerant stored in the receiver to the evaporator. This prevents excess refrigerant from flowing into the compressor and increases the amount of refrigerant circulating in the evaporator. This reduces the risk of liquid slugging in the compressor and improves the temperature rise rate of the refrigeration equipment.

[0073] In some embodiments, the control method further includes: controlling the reflux valve to open for a set duration after the compressor stops.

[0074] Specifically, at the moment the compressor stops, by controlling the reflux valve to open for a set time, the refrigerant remaining in the receiver can be returned to the evaporator, causing the evaporator to passively evaporate and cool, thus improving the evaporator's cooling effect and effectively extending the compressor's downtime.

[0075] This disclosure provides another control method for refrigeration equipment, such as... Figure 6 As shown, the control method includes:

[0076] S601, the processor confirms the compressor's operating status.

[0077] S602, the processor obtains the current liquid level of the refrigerant in the receiver while the compressor is running.

[0078] S603: When the current liquid level reaches the set liquid level, the processor controls the reflux valve to open for a set duration.

[0079] S604, the processor detects the current temperature rise rate within the cooling equipment.

[0080] Specifically, a high-precision temperature sensor can be installed inside the refrigeration equipment to monitor temperature changes inside the equipment in real time. Combined with time recordings, the current temperature-up rate within the refrigeration equipment can be calculated. Alternatively, an infrared thermal imager can be used to scan various parts of the refrigeration equipment, and the current temperature-up rate can be calculated based on the heat distribution image provided by the infrared thermal imager. Other existing methods can also be used to detect the current temperature-up rate within the refrigeration equipment, which will not be elaborated upon in this embodiment.

[0081] S605: When the current pull-up speed is less than the set speed, the processor determines the target duration for the reflux valve to be opened based on the current pull-up speed.

[0082] Specifically, if the current temperature-up rate is lower than the set rate, it indicates that the refrigerant charge circulating in the evaporator is insufficient. However, in this case, adding too much refrigerant to the evaporator can easily cause liquid slugging in the compressor. Therefore, in this situation, it is necessary to determine the target duration for the reflux valve to open based on the current temperature-up rate in order to add an appropriate amount of refrigerant to the evaporator.

[0083] Optionally, the target duration for which the reflux valve needs to be opened is determined based on the current temperature-up rate, including: calculating the speed difference between the set speed and the current temperature-up rate; determining the amount of refrigerant to be added to the evaporator based on the speed difference; and determining the target duration based on the amount of refrigerant added.

[0084] Specifically, by calculating the speed difference between the set speed and the current temperature-up speed, it is possible to deduce how much refrigerant needs to be added to the evaporator to raise the temperature-up speed of the refrigeration equipment to the set speed. Therefore, the amount of refrigerant to be added to the evaporator can be determined based on the speed difference.

[0085] Specifically, the flow rate of refrigerant in the receiver into the evaporator through the reflux valve is constant. Therefore, the target duration for opening the reflux valve can be determined based on the amount of refrigerant replenished.

[0086] S606, the processor controls the target duration for the reflux valve to open.

[0087] Specifically, by controlling the target duration of the refrigeration valve opening, the temperature-raising speed of the refrigeration equipment can be increased to the set speed.

[0088] In this embodiment, the heating rate of the refrigeration equipment can be detected in real time. If the heating rate is lower than a set rate, the reflux valve can be opened to increase the heating rate. This reduces the energy consumption of the refrigeration equipment and improves its preservation effect on the items placed inside.

[0089] Combination Figure 7 As shown, this disclosure provides a control device 700 for a refrigeration equipment, including: a confirmation module 701, an acquisition module 702, and a control module 703. The confirmation module 701 is configured to confirm the operating status of the compressor. The acquisition module 702 is configured to acquire the current liquid level of the refrigerant in the receiver when the compressor is running. The control module 703 is configured to control the reflux valve to open for a set duration when the current liquid level reaches a set liquid level.

[0090] Combination Figure 8 As shown, this disclosure provides a control device 800 for a refrigeration device, including a processor 801 and a memory 802. Optionally, the device may further include a communication interface 803 and a bus 804. The processor 801, communication interface 803, and memory 802 can communicate with each other via the bus 804. The communication interface 803 can be used for information transmission. The processor 801 can call logical instructions in the memory 802 to execute the control method for the refrigeration device described in the above embodiment.

[0091] Furthermore, the logic instructions in the aforementioned memory 802 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0092] The memory 802, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 801 executes functional applications and data processing by running the program instructions / modules stored in the memory 802, thereby implementing the control method for the refrigeration equipment in the above embodiments.

[0093] The memory 802 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 802 may include high-speed random access memory and may also include non-volatile memory.

[0094] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the aforementioned control method for a refrigeration device.

[0095] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0096] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0097] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art 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 embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0098] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0099] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A refrigeration system for a refrigeration appliance, characterized in that, include: A refrigeration circuit consisting of a compressor, a condenser, and an evaporator connected in sequence; A receiver is located in the circuit connecting the compressor and the evaporator and is used to store excess refrigerant during the refrigeration cycle. A liquid level detection device is installed inside the liquid receiver to detect the liquid level of the refrigerant inside the liquid receiver; The reflux valve connects the liquid receiver to the inlet of the evaporator. Specifically, when the liquid level detection device detects that the refrigerant level in the receiver has reached the set liquid level, it controls the reflux valve to open, allowing the refrigerant stored in the receiver to flow back into the evaporator.

2. The refrigeration system of claim 1, wherein, Also includes: A one-way valve is installed in the circuit connecting the return valve and the evaporator to prevent refrigerant in the evaporator from flowing back into the receiver.

3. The refrigeration system of claim 1, wherein, Also includes: A dryer filter is installed in the connecting loop between the condenser and the evaporator to absorb moisture from the refrigerant; The capillary tube, with one end connected to the outlet of the dryer filter and the other end connected to the inlet of the evaporator, is used to throttle and reduce the pressure of the refrigerant flowing out of the condenser.

4. The refrigeration system according to any one of claims 1 to 3, characterized in that, The angle between the pipe where the reflux valve is located and the evaporator inlet pipe is greater than or equal to 5 degrees and less than or equal to 175 degrees.

5. A control method for a refrigeration apparatus applied to a refrigeration apparatus provided with the refrigeration system according to any one of claims 1 to 4, characterized by, Control methods include: Confirm the compressor's operating status; With the compressor running, obtain the current liquid level of the refrigerant in the receiver. When the current liquid level reaches the set liquid level, control the reflux valve to open for a set duration.

6. The control method according to claim 5, characterized in that, Control methods also include: After the compressor stops, the control reflux valve is opened for a set time.

7. The control method according to claim 5 or 6, characterized in that, Control methods also include: Detect the current temperature rise rate within the refrigeration equipment; If the current heating speed is less than the set speed, determine the target duration for the reflux valve to open based on the current heating speed; Control the target duration for the reflux valve to open.

8. The control method according to claim 7, characterized in that, Determine the target duration for which the reflux valve needs to be open based on the current temperature rise rate, including: Calculate the speed difference between the set speed and the current temperature-controlled temperature riser. The amount of refrigerant that needs to be added to the evaporator is determined based on the speed difference. The target duration is determined based on the amount of refrigerant replenished.

9. A control device for a refrigeration equipment, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to perform a control method for a refrigeration device as described in any one of claims 5 to 8.

10. A refrigeration device, characterized in that, include: Equipment body; The refrigeration system for the refrigeration equipment as described in any one of claims 1 to 4 is disposed within the equipment body; The control device for refrigeration equipment as described in claim 9 is electrically connected to the refrigeration system.

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