Refrigerator and capillary tube blocking judgment method thereof

Abstract

The invention discloses a refrigerator and a capillary tube blocking judgment method thereof, and provides a commodity inspection mode for the refrigerator adopting a parallel double-capillary tube structure, when the commodity inspection mode is started, a first capillary tube and a second capillary tube are conducted at the same time through a switching valve, and refrigeration is controlled to start refrigeration; the refrigeration initial temperature is recorded and compared with the temperature after refrigeration for a period of time, whether the double capillary tubes are blocked or not can be determined according to the comparison result, whether the capillary tubes are blocked or not can be judged before the refrigerator leaves the factory or after the refrigerator leaves the factory, detection is achieved by adjusting an operation model of the refrigerator, disassembly is not needed, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a refrigerator and a method for determining capillary blockage thereof. Background Art

[0002] Current refrigerator systems typically use capillary tubes to achieve throttling, cooling, and pressure reduction. Capillary tubes are very thin tubes with an inner diameter, typically 1 mm or less. Some tubes are as thin as a hair, hence the name. After prolonged operation, water vapor in the refrigerant and impurities accumulated in the compressor can clog the capillary tubes, preventing the refrigerant from flowing through them and rendering the refrigerator inoperable. Currently, maintenance personnel can only detect capillary tube blockages by disassembling the refrigerator, a time-consuming and labor-intensive process with low efficiency. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a refrigerator and a method for determining whether the capillary tube is clogged, which can determine whether the capillary tube is clogged before the refrigerator leaves the factory or after it is used. The detection is achieved by adjusting the operating model of the refrigerator without disassembling the refrigerator, thereby improving detection efficiency.

[0004] To achieve the above object, an embodiment of the present invention provides a refrigerator, comprising:

[0005] a box body, in which at least one freezing chamber and a refrigerating chamber are formed;

[0006] A refrigeration system, disposed within the housing, comprising a compressor, a condenser, a switching valve, a capillary tube assembly, and an evaporator connected in sequence; wherein the capillary tube assembly comprises a first capillary tube and a second capillary tube connected in parallel, and the switching valve is used to control the flow of refrigerant through the first capillary tube and / or the second capillary tube;

[0007] A freezing temperature sensor is provided in the freezing chamber and is used to obtain the freezing temperature;

[0008] The controller is configured as:

[0009] When entering the commodity inspection mode, obtaining the initial freezing temperature detected by the freezing sensor, and adjusting the valve port state of the switching valve so that the first capillary tube and the second capillary tube are both conductive;

[0010] When the operation time of the freezing and refrigeration mode reaches a first operation time threshold, obtaining a first freezing temperature detected by the freezing sensor;

[0011] When the first freezing temperature is less than the initial freezing temperature, and the freezing temperature difference between the initial freezing temperature and the first freezing temperature is less than or equal to the freezing temperature difference threshold, it is determined that the first capillary or the second capillary is blocked.

[0012] As an improvement to the above solution, the controller is further configured to:

[0013] When the first freezing temperature is less than the initial freezing temperature, and the freezing temperature difference between the initial freezing temperature and the first freezing temperature is greater than the freezing temperature difference threshold, it is determined that neither the first capillary nor the second capillary is blocked;

[0014] When the first freezing temperature is greater than or equal to the initial freezing temperature, it is determined that the refrigeration system is in an abnormal state.

[0015] As an improvement to the above solution, the abnormal state conforms to at least one of the following situations: both the first capillary and the second capillary are blocked, the switching valve is blocked, the compressor fails, or the refrigerant is lacking.

[0016] As an improvement to the above solution, after determining that the first capillary or the second capillary is blocked, the controller is further configured to:

[0017] Adjust the valve port state of the switching valve to make the first capillary conductive and the second capillary non - conductive;

[0018] When the operating duration of the freezing refrigeration mode reaches the second operating duration threshold, obtain the second freezing temperature detected by the freezing sensor;

[0019] When the second freezing temperature is less than the first freezing temperature, it is determined that the first capillary is not blocked and the second capillary is blocked;

[0020] When the second freezing temperature is greater than or equal to the first freezing temperature, it is determined that the first capillary is blocked and the second capillary is not blocked.

[0021] As an improvement to the above solution, when the freezing refrigeration mode is running, the refrigerating refrigeration mode stops running.

[0022] As an improvement to the above solution, the refrigerator further includes:

[0023] A refrigerating temperature sensor, disposed in the refrigerating chamber, for obtaining the refrigerating temperature;

[0024] Then, after entering the commodity inspection mode, the controller is further configured to:

[0025] Acquiring an initial refrigeration temperature detected by the refrigeration sensor and an initial freezing temperature detected by the freezing sensor, and adjusting a valve port state of the switching valve so that both the first capillary tube and the second capillary tube are conductive;

[0026] Entering a freezing refrigeration mode and a refrigeration refrigeration mode, and when the operation time of the freezing refrigeration mode and the refrigeration refrigeration mode reaches a set operation time threshold, obtaining a third freezing temperature detected by the freezing sensor and a first refrigeration temperature detected by the refrigeration sensor;

[0027] If the third freezing temperature is lower than the initial freezing temperature and the first refrigerating temperature is higher than or equal to the initial refrigerating temperature, the refrigerating chamber is determined to be unqualified.

[0028] To achieve the above objectives, an embodiment of the present invention further provides a method for determining whether a refrigerator capillary tube is clogged. The refrigerator is provided with a first capillary tube and a second capillary tube connected in parallel and controlled by a switching valve. The method comprises:

[0029] When entering the commodity inspection mode, obtaining the initial freezing temperature of the freezing chamber and adjusting the valve port state of the switching valve so that the first capillary tube and the second capillary tube are both conductive;

[0030] When the operating time of the freezing and refrigeration mode reaches a first operating time threshold, obtaining a first freezing temperature of the freezing chamber;

[0031] When the first freezing temperature is lower than the initial freezing temperature, and a freezing temperature difference between the initial freezing temperature and the first freezing temperature is lower than or equal to a freezing temperature difference threshold, it is determined that the first capillary tube or the second capillary tube is clogged.

[0032] As an improvement to the above solution, the method further includes:

[0033] When the first freezing temperature is lower than the initial freezing temperature, and the freezing temperature difference between the initial freezing temperature and the first freezing temperature is greater than a freezing temperature difference threshold, it is determined that both the first capillary tube and the second capillary tube are not blocked;

[0034] When the first freezing temperature is greater than or equal to the initial freezing temperature, it is determined that the refrigeration system is in an abnormal state.

[0035] As an improvement of the above solution, the abnormal state meets at least one of the following conditions: both the first capillary tube and the second capillary tube are blocked, the switching valve is blocked, the compressor fails, and there is a lack of refrigerant.

[0036] As an improvement to the above solution, after determining that the first capillary tube or the second capillary tube is blocked, the method further includes:

[0037] Adjusting the valve port state of the switching valve so that the first capillary tube is conductive and the second capillary tube is not conductive;

[0038] When the operation time of the freezing and refrigeration mode reaches a second operation time threshold, obtaining a second freezing temperature of the freezing chamber;

[0039] When the second freezing temperature is lower than the first freezing temperature, determining that the first capillary tube is not blocked and the second capillary tube is blocked;

[0040] When the second freezing temperature is greater than or equal to the first freezing temperature, it is determined that the first capillary tube is clogged and the second capillary tube is not clogged.

[0041] The refrigerator and the method for determining whether the capillary tubes are clogged disclosed in the present invention provide a commercial inspection mode for refrigerators using a parallel double-capillary tube structure. When the commercial inspection mode is activated, a first capillary tube and a second capillary tube are simultaneously connected through a switching valve to control the freezing and start refrigeration. The initial freezing temperature and the temperature after a period of refrigeration are recorded and compared. Based on the comparison result, it is determined whether the double capillary tubes are clogged. Whether the capillary tubes are clogged can be determined before the refrigerator leaves the factory or after use. The detection is achieved by adjusting the operating model of the refrigerator without disassembling the refrigerator, thereby improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 1 is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0044] Figure 3 1 is a schematic structural diagram of a refrigeration system in a refrigerator provided by an embodiment of the present invention;

[0045] Figure 4 is a schematic diagram of the connection between the controller and other hardware devices provided by an embodiment of the present invention;

[0046] Figure 5 This is a first working flow diagram of the controller provided by an embodiment of the present invention;

[0047] Figure 6 is a second working flow diagram of the controller provided by an embodiment of the present invention;

[0048] Figure 7 is a third working flow diagram of the controller provided in an embodiment of the present invention;

[0049] Figure 8 is a fourth working flow diagram of the controller provided in an embodiment of the present invention;

[0050] Figure 9 It is the fifth working flowchart of the controller provided by the embodiment of the present invention;

[0051] Figure 10 It is the flowchart of a method for judging the blockage of the capillary tube of a refrigerator provided by the embodiment of the present invention.

[0052] Among them, 100 is a refrigerator; 1 is a compressor; 2 is a condenser; 3 is a drying filter; 4 is a switching valve; 51 is a first capillary tube; 52 is a second capillary tube; 6 is an evaporator; 111 is a freezing temperature sensor; 112 is a refrigerating temperature sensor. Specific embodiments

[0053] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0054] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0055] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0056] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0057] See Figure 1 , Figure 1FIG. 0 is a schematic view of the external structure of a refrigerator 100 provided by an embodiment of the present invention. The refrigerator 100 in this embodiment has an approximate cuboid shape. The refrigerator includes a box body defining a storage space and a plurality of door bodies provided at the opening of the box body. Among them, the door body includes a door body outer shell located outside the box body, a door body inner liner located inside the box body, an upper end cover, a lower end cover, and a heat insulation layer located between the door body outer shell, the door body inner liner, the upper end cover, and the lower end cover; generally, the heat insulation layer is filled with foaming material. The box body is provided with a chamber, and the chamber includes a component storage chamber for placing components in the refrigerator, such as a compressor compartment, etc., and also includes a storage space for storing foods, etc.

[0058] See Figure 2 , Figure 2 FIG. 7 is a schematic view of the internal structure of a refrigerator provided by an embodiment of the present invention. The storage space can be divided into a plurality of storage compartments. According to different uses, the storage compartments can be configured as a refrigerating compartment and a freezing compartment, and can also include a variable temperature compartment, a vacuum drawer, a humidity preservation drawer, and so on. Each storage compartment corresponds to one or more door bodies. For example, in Figure 2 , the upper storage compartment is provided with a double-door body. Among them, the door body can be pivotally arranged at the opening of the box body, or can also be opened in a drawer type to realize drawer-type storage. A display screen is provided at the door of the refrigerator, and the display screen is used for displaying prompt information and receiving touch operations of the user.

[0059] See Figure 3 , Figure 3The structural diagram of the refrigeration system in the refrigerator provided by the embodiment of the present invention, the refrigeration system includes a compressor 1, a condenser 2, a drying filter 3, a switching valve 4, a capillary assembly (including a first capillary 51 and a second capillary 52), an evaporator 6 and a gas-liquid separator (not shown in the figure). The working process of the refrigeration system includes a compression process, a condensation process, a throttling process and an evaporation process. Among them, the compression process is: when the power cord of the refrigerator is plugged in, when the contacts of the thermostat are connected, the compressor 1 starts to work, and the low-temperature, low-pressure refrigerant is sucked into the compressor 1, and is compressed into a high-temperature, high-pressure superheated gas in the cylinder of the compressor 1 and then discharged into the condenser 2; the condensation process is: the high-temperature, high-pressure refrigerant gas dissipates heat through the condenser 2, the temperature continues to drop, and is gradually cooled to a saturated vapor at room temperature and high pressure, and is further cooled to a saturated liquid, and the temperature no longer drops. The temperature at this time is called the condensation temperature, and the pressure of the refrigerant remains almost unchanged during the entire condensation process; the throttling process is as follows: The process is as follows: the saturated refrigerant liquid after condensation is filtered out of moisture and impurities by the drying filter 3 and then flows into the capillary tube assembly, through which it is throttled and reduced in pressure, and the refrigerant becomes wet steam at room temperature and low pressure; the evaporation process is as follows: the wet steam at room temperature and low pressure begins to absorb heat and vaporize in the evaporator 6, which not only reduces the temperature of the evaporator 6 and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator 6 passes through the gas-liquid separator and returns to the compressor 1 again, repeating the above process to transfer the heat in the refrigerator to the air outside the box, thereby achieving the purpose of refrigeration.

[0060] Furthermore, the capillary tube assembly in the embodiment of the present invention includes a first capillary tube 51 and a second capillary tube 52 connected in parallel, and the refrigerant is controlled to flow through the first capillary tube 51 and / or the second capillary tube 52 by the switching valve 4. If the switching valve 4 is a three-way valve with three ports, the first end is connected to the first capillary tube 51, the second end is connected to the second capillary tube 52, and the third end is connected to the drying filter 3, when the first end, the second end and the third end of the switching valve 4 are all connected, the first capillary tube 51 and the second capillary tube 52 are both connected, and at this time, the refrigerant flows in through the first end of the switching valve 4, and flows through the first capillary tube 51 and the second capillary tube 52 respectively before merging into the evaporator 6; when the first end of the switching valve 4 is closed, the refrigerant flows in through the first capillary tube 51 and the second capillary tube 52 respectively before merging into the evaporator 6; When the first end and the third end are conductive and the second end is not conductive, the first capillary tube 51 is conductive and the second capillary tube 52 is not conductive. At this time, the refrigerant flows in through the first end of the switching valve 4, flows through the first capillary tube 51, and then merges into the evaporator 6; when the second end and the third end of the switching valve 4 are conductive and the first end is not conductive, the first capillary tube 51 is not conductive and the second capillary tube 52 is conductive. At this time, the refrigerant flows in through the first end of the switching valve 4, flows through the second capillary tube 52, and then merges into the evaporator 6.

[0061] See alsoFigure 4 , Figure 4 is a schematic connection diagram of the controller provided by an embodiment of the present invention and other hardware devices. In the embodiment of the present invention, the controller is respectively connected to a freezing temperature sensor 111, a refrigerating temperature sensor 112, the compressor 1, the switching valve 4 and a defrosting controller. The controller can control and receive the detection data sent by the freezing temperature sensor 111 and the refrigerating temperature sensor 112, and can also control the startup and shutdown of the freezing temperature sensor 111 and the refrigerating temperature sensor 112. The controller can also control the startup and shutdown of the compressor 1 and the defrosting heater, and control the conduction and shutdown of the three ports of the switching valve 4.

[0062] Specifically, the controller is configured to: when entering the commodity inspection mode, obtain the initial freezing temperature detected by the freezing sensor, and adjust the valve port state of the switching valve so that both the first capillary tube and the second capillary tube are conductive; when the operation duration of the freezing refrigeration mode reaches a first operation duration threshold, obtain the first freezing temperature detected by the freezing sensor; when the first freezing temperature is less than the initial freezing temperature, and the freezing temperature difference between the initial freezing temperature and the first freezing temperature is less than or equal to a freezing temperature difference threshold, it is determined that the first capillary tube or the second capillary tube is blocked.

[0063] Exemplarily, refer to Figure 5 , Figure 5 is the first working flowchart of the controller provided by an embodiment of the present invention. The controller is configured to execute steps S11 to S18. The commodity inspection mode is pre-set by the manufacturer in the refrigerator, and the commodity inspection mode can be started manually or automatically. Before the refrigerator leaves the factory, the staff can determine whether the capillary tube is blocked for the refrigerator, or when the refrigerator is purchased by the user, the user can decide when to start the commodity inspection mode. If the refrigerator automatically starts the commodity inspection mode, the controller needs to pre-store a startup cycle, such as starting the commodity inspection mode every once in a while (1 month, 6 months, one year, etc.).

[0064] In steps S11 to S13, after the refrigerator enters the commodity inspection mode, record the initial freezing temperature TFO detected by the freezing temperature sensor, and control the switching valve to conduct three ports, so that both the first capillary tube and the second capillary tube are conducted, and the refrigerant will flow through the first capillary tube and the second capillary tube, and then control the refrigerator to operate in the freezing refrigeration mode. It can be understood that if the commodity inspection of the refrigerator is carried out before leaving the factory, the commodity inspection mode can be entered by continuously pressing the cold storage door switch 5 times within 10 minutes after the refrigerator is powered on. At this time, since it has only been refrigerated for a very short time, the temperature of the freezer when entering the commodity inspection mode is not very low. If the user has started the refrigerator after leaving the factory and the commodity inspection of the refrigerator is carried out after the refrigerator has been running for a long time, at this time, since the refrigerator may have been executing the freezing refrigeration program before entering the commodity inspection mode, the temperature of the freezer when entering the commodity inspection mode is relatively low. Therefore, after entering the commodity inspection mode, the rotational speed of the compressor can be further increased so that the freezer can continue to lower the temperature, which is convenient for subsequent evaluation of whether the freezer is normally refrigerated.

[0065] Further, during this process, in order to improve the temperature reduction speed of the freezer and thus shorten the commodity inspection duration, only the freezing refrigeration mode is operated at this time, and the refrigerating refrigeration mode is not operated. All the cold air generated by the evaporator will flow into the freezer. The effect of only operating the freezing refrigeration mode (not operating the refrigerating refrigeration mode) can be achieved by closing the air damper of the cold storage.

[0066] In steps S14 to S15, the first operation duration threshold can be preset, such as 10 min or 20 min. When the operation duration of the refrigerator in the freezing refrigeration mode only reaches the first operation duration threshold, obtain the first freezing temperature TF1 detected by the freezing temperature sensor again. At this time, it can be selected to exit the freezing refrigeration mode, or it can also not exit.

[0067] In steps S16 to S18, if it is detected that the first freezing temperature TF1 is less than the initial freezing temperature TFO, it indicates that the freezer compartment is being cooled normally. At this time, the freezing temperature difference between the initial freezing temperature TF0 and the first freezing temperature TF1 is further calculated. When the freezing temperature difference is less than or equal to the freezing temperature difference threshold, it indicates that although the freezer compartment is being cooled normally (the freezing temperature has decreased), the cooling effect is not obvious, and it can be determined that the first capillary or the second capillary is blocked. It is worth noting that the freezing temperature difference threshold can be pre-set, such as in the laboratory according to the refrigerator operating parameters (compressor gear change, ambient temperature, both capillaries are turned on, only the freezing and refrigeration mode is running, and the freezing and refrigeration mode operation time meets the first operation time threshold), so as to obtain the freezing temperature difference of the freezer compartment under different refrigerator operating parameters, and use these cooling temperature differences as the freezing temperature difference threshold. In actual application, according to the actual operating parameters of the refrigerator, the corresponding freezing temperature difference threshold is obtained and compared with the freezing temperature difference.

[0068] Specifically, the controller is further configured to: determine that both the first capillary tube and the second capillary tube are not blocked when the first freezing temperature is lower than the initial freezing temperature and the freezing temperature difference between the initial freezing temperature and the first freezing temperature is greater than a freezing temperature difference threshold; and determine that the refrigeration system is in an abnormal state when the first freezing temperature is greater than or equal to the initial freezing temperature. The abnormal state meets at least one of the following conditions: both the first capillary tube and the second capillary tube are blocked, the switching valve is blocked, the compressor is faulty, or there is a lack of refrigerant.

[0069] For example, see Figure 6 , Figure 6 This is a second workflow diagram of the controller provided by an embodiment of the present invention. After executing step S16, if the controller detects that the first freezing temperature TF1 is greater than or equal to the initial freezing temperature TFO, it indicates that the freezing temperature of the freezer compartment remains unchanged or has increased in the freezing and refrigeration mode. At this time, no cold air is entering the freezer compartment, and it can be determined that a refrigeration system abnormality has occurred. After executing step S17, if the controller detects that the freezing temperature difference is greater than the freezing temperature difference threshold, it indicates that the freezer compartment is cooling normally (the freezing temperature has decreased) and the cooling effect is significant, and it can be determined that neither the first capillary tube nor the second capillary tube is blocked.

[0070] In an embodiment of the present invention, the initial freezing temperature and the temperature after a period of refrigeration are recorded for comparison. Based on the comparison results, it can be determined whether the double capillaries are blocked. This allows the determination of whether the capillaries are blocked before the refrigerator leaves the factory or after use.

[0071] Specifically, after determining that the first capillary or the second capillary is blocked, the controller is further configured to: adjust the valve port state of the switching valve to make the first capillary conductive and the second capillary non-conductive; when the operation duration of the freezing refrigeration mode reaches a second operation duration threshold, obtain a second freezing temperature detected by the freezing sensor; when the second freezing temperature is less than the first freezing temperature, determine that the first capillary is not blocked and the second capillary is blocked.

[0072] Exemplarily, referring to Figure 7 , Figure 7 FIG. is the third working flowchart of the controller provided by the embodiment of the present invention. After the controller executes step S18, it is further configured to execute steps S19 to S25. After determining that the first capillary or the second capillary is blocked, it is necessary to further determine which capillary is specifically blocked. At this time, the first capillary is selected to be conductive and the second capillary is closed. When the operation duration of the freezing refrigeration mode reaches a second operation duration threshold, obtain a second freezing temperature TF2 detected by the freezing temperature sensor. The second operation duration threshold can be preset, such as default set to 10 min, 15 min, etc., and no specific limitation is made here. Compare the second freezing temperature TF2 with the first freezing temperature TF1. If the second freezing temperature TF2 is less than the first freezing temperature TF1, it means that the freezer is normally refrigerated (the freezing temperature decreases). This state is the same as the situation in step S16 above, and since the first capillary is conductive at this time, it can be determined that the first capillary is not blocked, then the second capillary is blocked.

[0073] Further, during this process, in order to increase the cooling speed of the freezer and thus shorten the commodity inspection duration, only the freezing refrigeration mode is operated at this time, and the refrigerating refrigeration mode is not operated. All the cold air generated by the evaporator will flow into the freezer. The effect of only operating the freezing refrigeration mode (not operating the refrigerating refrigeration mode) can be achieved by closing the air door of the refrigerator compartment.

[0074] Specifically, the controller is further configured to: when the second freezing temperature is greater than or equal to the first freezing temperature, determine that the first capillary is blocked and the second capillary is not blocked.

[0075] Exemplarily, referring to Figure 8 , Figure 8 FIG. is the fourth working flowchart of the controller provided by the embodiment of the present invention. If the second freezing temperature TF2 is greater than or equal to the first freezing temperature TF1, it means that the freezer is not refrigerated. Since only the first capillary is conductive at this time, it can be determined that the first capillary is blocked, then the second capillary is not blocked.

[0076] In an embodiment of the present invention, when it is preliminarily determined that any one of the double capillaries is blocked, the cooling effect of the freezer compartment is determined by only conducting one capillary, so that it is possible to accurately check which capillary is blocked.

[0077] Specifically, after entering the commodity inspection mode, the controller is further configured to: obtain the initial refrigerating temperature detected by the refrigerating sensor and the initial freezing temperature detected by the freezing sensor, and adjust the valve port state of the switching valve so that both the first capillary and the second capillary are conducted; enter the freezing refrigeration mode and the refrigerating refrigeration mode. When the operation duration of the freezing refrigeration mode and the refrigerating refrigeration mode reaches the set operation duration threshold, obtain the third freezing temperature detected by the freezing sensor and the first refrigerating temperature detected by the refrigerating sensor; if the third freezing temperature is less than the initial freezing temperature, and the first refrigerating temperature is greater than or equal to the initial refrigerating temperature, it is determined that the refrigerating compartment is unqualified.

[0078] Exemplarily, referring to Figure 9 , Figure 9 FIG. 5 is the fifth working flowchart of the controller provided by the embodiment of the present invention. After executing step S11, the controller is further configured to execute steps S31 to S39 to obtain the initial refrigerating temperature TRO of the refrigerating compartment and the initial freezing temperature TFO of the freezing compartment. The refrigerating refrigeration mode and the freezing refrigeration mode operate simultaneously (both the freezing air door and the refrigerating air door are opened). When the operation duration reaches the set operation duration threshold, obtain the first refrigerating temperature TR1 detected by the refrigerating temperature sensor and the third freezing temperature TF3 detected by the freezing temperature sensor. If the third freezing temperature TF3 is less than the initial freezing temperature TF0, it indicates that the freezing compartment is normally refrigerated. If the first refrigerating temperature TR1 is greater than or equal to the initial refrigerating temperature TR0, it indicates that the refrigerating compartment is not normally refrigerated, and it can be determined that the refrigerating compartment is unqualified at this time, such as caused by the insulation layer not functioning, the door not being sealed, or the air door opening failure.

[0079] In an embodiment of the present invention, by synchronously refrigerating the freezer compartment and the refrigerating compartment of the refrigerator and detecting the cooling effect to determine whether a fault occurs in the refrigerating compartment, the efficiency of fault detection in the refrigerating compartment can be improved.

[0080] Further, when it is detected that the first capillary is blocked, the second capillary is blocked, the refrigeration system is abnormal, or the refrigerating compartment is unqualified, corresponding prompt information is issued.

[0081] Exemplarily, for the above several different fault situations, at least one of different sound prompts, light prompts, display text prompts, or remote prompts can be issued to inform the user / staff that there is a fault in the refrigerator at this time and it needs to be processed in time.

[0082] The refrigerator disclosed in the embodiment of the present invention provides an inspection mode for a refrigerator with a parallel dual-capillary structure. When the inspection mode is started, the first capillary and the second capillary are simultaneously conducted through a switching valve to control the freezer to start refrigerating. The initial freezer temperature is recorded and compared with the temperature after refrigerating for a period of time. According to the comparison result, it can be determined whether the dual-capillaries are blocked. It can judge whether the capillary is blocked before the refrigerator leaves the factory or after it is put into use. The detection is realized by adjusting the operation model of the refrigerator without disassembling the machine, improving the detection efficiency.

[0083] See Figure 10 , Figure 10 FIG. is a flowchart of a method for determining capillary blockage of a refrigerator provided by an embodiment of the present invention. The refrigerator is provided with a first capillary and a second capillary connected in parallel and controlled by a switching valve. The method includes:

[0084] S1. When entering the inspection mode, obtain the initial freezer temperature and adjust the valve port state of the switching valve so that both the first capillary and the second capillary are conducted;

[0085] S2. When the operation duration of the freezer refrigeration mode reaches the first operation duration threshold, obtain the first freezer temperature of the freezer;

[0086] S3. When the first freezer temperature is lower than the initial freezer temperature and the freezer temperature difference between the initial freezer temperature and the first freezer temperature is less than or equal to the freezer temperature difference threshold, it is determined that the first capillary or the second capillary is blocked.

[0087] Specifically, the method further includes:

[0088] When the first freezer temperature is lower than the initial freezer temperature and the freezer temperature difference between the initial freezer temperature and the first freezer temperature is greater than the freezer temperature difference threshold, it is determined that neither the first capillary nor the second capillary is blocked;

[0089] When the first freezer temperature is greater than or equal to the initial freezer temperature, it is determined that the refrigeration system is in an abnormal state.

[0090] Specifically, the abnormal state conforms to at least one of the following situations: both the first capillary and the second capillary are blocked, the switching valve is blocked, the compressor fails, and the refrigerant is lacking.

[0091] Specifically, after determining that the first capillary or the second capillary is blocked, the method further includes:

[0092] Adjust the valve port state of the switching valve so that the first capillary is conducted and the second capillary is not conducted;

[0093] When the operating duration of the freezing refrigeration mode reaches the second operating duration threshold, obtain the second freezing temperature of the freezer compartment;

[0094] When the second freezing temperature is lower than the first freezing temperature, determine that the first capillary tube is not blocked and the second capillary tube is blocked;

[0095] When the second freezing temperature is greater than or equal to the first freezing temperature, determine that the first capillary tube is blocked and the second capillary tube is not blocked.

[0096] Specifically, after entering the commodity inspection mode, the method further includes:

[0097] Obtain the initial refrigerating temperature of the refrigerating compartment and the initial freezing temperature of the freezer compartment, and adjust the valve port state of the switching valve so that both the first capillary tube and the second capillary tube are conducting;

[0098] Enter the freezing refrigeration mode and the refrigerating refrigeration mode. When the operating durations of the freezing refrigeration mode and the refrigerating refrigeration mode reach the set operating duration threshold, obtain the third freezing temperature of the freezer compartment and the first refrigerating temperature of the refrigerating compartment;

[0099] If the third freezing temperature is lower than the initial freezing temperature and the first refrigerating temperature is greater than or equal to the initial refrigerating temperature, determine that the refrigerating compartment is unqualified.

[0100] It should be noted that for the specific working process of the refrigerator capillary tube blockage determination method described in the embodiments of the present invention, reference may be made to the working process of the controller in the refrigerator described in the above embodiments, which will not be elaborated here.

[0101] The refrigerator capillary tube blockage determination method disclosed in the present invention provides a commodity inspection mode for a refrigerator adopting a parallel dual-capillary tube structure. When the commodity inspection mode is started, the first capillary tube and the second capillary tube are simultaneously conducted through the switching valve, the freezing is controlled to start refrigerating, the initial freezing temperature is recorded and compared with the temperature after refrigerating for a period of time, and it can be determined whether the dual-capillary tubes are blocked according to the comparison result. It can judge whether the capillary tubes are blocked before the refrigerator leaves the factory or after it is put into use, and realizes the detection by adjusting the operation model of the refrigerator, without disassembling the machine, improving the detection efficiency.

[0102] The above is the preferred implementation manner of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A refrigerator, characterized in that, include: a box body, in which at least one freezing chamber and a refrigerating chamber are formed; A refrigeration system, disposed within the housing, comprising a compressor, a condenser, a switching valve, a capillary tube assembly, and an evaporator connected in sequence; wherein the capillary tube assembly comprises a first capillary tube and a second capillary tube connected in parallel, and the switching valve is used to control the flow of refrigerant through the first capillary tube and / or the second capillary tube; A freezing temperature sensor is provided in the freezing chamber and is used to obtain the freezing temperature; The controller is configured as: When entering the commodity inspection mode, obtaining the initial freezing temperature detected by the freezing sensor, and adjusting the valve port state of the switching valve so that the first capillary tube and the second capillary tube are both conductive; When the operation time of the freezing and refrigeration mode reaches a first operation time threshold, obtaining a first freezing temperature detected by the freezing sensor; When the first freezing temperature is lower than the initial freezing temperature, and a freezing temperature difference between the initial freezing temperature and the first freezing temperature is lower than or equal to a freezing temperature difference threshold, it is determined that the first capillary tube or the second capillary tube is clogged.

2. The refrigerator according to claim 1, characterized in that, The controller is further configured to: When the first freezing temperature is lower than the initial freezing temperature, and the freezing temperature difference between the initial freezing temperature and the first freezing temperature is greater than a freezing temperature difference threshold, it is determined that both the first capillary tube and the second capillary tube are not blocked; When the first freezing temperature is greater than or equal to the initial freezing temperature, it is determined that the refrigeration system is in an abnormal state.

3. The refrigerator according to claim 2, wherein, The abnormal state meets at least one of the following conditions: both the first capillary tube and the second capillary tube are blocked, the switching valve is blocked, the compressor fails, or there is a lack of refrigerant.

4. The refrigerator according to claim 1, characterized in that, After determining that the first capillary tube or the second capillary tube is blocked, the controller is further configured to: Adjusting the valve port state of the switching valve so that the first capillary tube is conductive and the second capillary tube is not conductive; When the operation time of the freezing and refrigeration mode reaches a second operation time threshold, obtaining a second freezing temperature detected by the freezing sensor; When the second freezing temperature is lower than the first freezing temperature, determining that the first capillary tube is not blocked and the second capillary tube is blocked; When the second freezing temperature is greater than or equal to the first freezing temperature, it is determined that the first capillary tube is clogged and the second capillary tube is not clogged.

5. The refrigerator according to any one of claims 1 to 4, characterized in that, When the freezing refrigeration mode is running, the refrigeration mode is stopped.

6. The refrigerator according to claim 1, wherein The refrigerator further comprises: A refrigeration temperature sensor is provided in the refrigeration chamber and is used to obtain the refrigeration temperature; Then, after entering the commodity inspection mode, the controller is further configured to: Acquiring an initial refrigeration temperature detected by the refrigeration sensor and an initial freezing temperature detected by the freezing sensor, and adjusting a valve port state of the switching valve so that both the first capillary tube and the second capillary tube are conductive; Entering a freezing refrigeration mode and a refrigeration refrigeration mode, and when the operation time of the freezing refrigeration mode and the refrigeration refrigeration mode reaches a set operation time threshold, obtaining a third freezing temperature detected by the freezing sensor and a first refrigeration temperature detected by the refrigeration sensor; If the third freezing temperature is lower than the initial freezing temperature and the first refrigerating temperature is higher than or equal to the initial refrigerating temperature, the refrigerating chamber is determined to be unqualified.

7. A method for determining the blockage of a refrigerator capillary tube, characterized in that, The refrigerator is provided with a first capillary tube and a second capillary tube connected in parallel and controlled by a switching valve, and the method includes: When entering the commodity inspection mode, obtaining the initial freezing temperature of the freezing chamber and adjusting the valve port state of the switching valve so that the first capillary tube and the second capillary tube are both conductive; When the operating time of the freezing and refrigeration mode reaches a first operating time threshold, obtaining a first freezing temperature of the freezing chamber; When the first freezing temperature is lower than the initial freezing temperature, and a freezing temperature difference between the initial freezing temperature and the first freezing temperature is lower than or equal to a freezing temperature difference threshold, it is determined that the first capillary tube or the second capillary tube is clogged.

8. The method for determining the clogging of the capillary tube of the refrigerator according to claim 7, characterized in that, The method further comprises: When the first freezing temperature is lower than the initial freezing temperature, and the freezing temperature difference between the initial freezing temperature and the first freezing temperature is greater than a freezing temperature difference threshold, it is determined that both the first capillary tube and the second capillary tube are not blocked; When the first freezing temperature is greater than or equal to the initial freezing temperature, it is determined that the refrigeration system is in an abnormal state.

9. The method for determining the clogging of the refrigerator capillary tube according to claim 8, characterized in that, The abnormal state meets at least one of the following conditions: both the first capillary tube and the second capillary tube are blocked, the switching valve is blocked, the compressor fails, or there is a lack of refrigerant.

10. The method for determining the clogging of the refrigerator capillary tube according to claim 7, characterized in that, After determining that the first capillary tube or the second capillary tube is blocked, the method further includes: Adjusting the valve port state of the switching valve so that the first capillary tube is conductive and the second capillary tube is not conductive; When the operation time of the freezing and refrigeration mode reaches a second operation time threshold, obtaining a second freezing temperature of the freezing chamber; When the second freezing temperature is lower than the first freezing temperature, determining that the first capillary tube is not blocked and the second capillary tube is blocked; When the second freezing temperature is greater than or equal to the first freezing temperature, it is determined that the first capillary tube is clogged and the second capillary tube is not clogged.

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