Double-evaporator refrigerator defrosting device, double-evaporator refrigerator and control method

Abstract

The invention relates to a double-evaporator refrigerator defrosting device, a double-evaporator refrigerator and a control method, the double-evaporator refrigerator defrosting device comprises a defrosting air duct, the air outlet end of the defrosting air duct is connected with a refrigeration evaporator, and the air inlet end of the defrosting air duct is located in a heat production area of a double-evaporator refrigerator compressor; the defrosting track is arranged among a compressor of the double-evaporator refrigerator, a condenser and the air inlet end of the defrosting air duct; the defrosting gas conveying assembly is movably arranged on the defrosting track; under the defrosting working condition, the defrosting gas conveying assembly is moved to the position between the compressor and the air inlet end of the defrosting air duct, and the defrosting gas conveying assembly is started to convey heat generated by the compressor to the defrosting air duct so as to defrost the refrigeration evaporator; in the refrigeration working condition, the defrosting gas conveying assembly is moved to the position between the compressor and the condenser, the defrosting gas conveying assembly is started to cool the condenser, and the problems that heat generated by an existing double-evaporator refrigerator is not fully utilized, and the energy utilization efficiency is low can be solved.

Description

Technical Field

[0001] This application relates to the field of HVAC technology, and in particular to a defrosting device for a dual-evaporator refrigerator, a dual-evaporator refrigerator, and a control method thereof. Background Technology

[0002] Traditional single-evaporator air-cooled refrigerators require interruption of the normal refrigeration cycle during the defrosting stage. Existing technologies are gradually adopting a dual-evaporator structure, which uses two evaporators to alternately perform refrigeration and defrosting operations to achieve continuity of the refrigeration process. However, existing dual-evaporator refrigerators have problems such as not fully utilizing the heat generated by the refrigerator and low energy efficiency. Summary of the Invention

[0003] This application provides a defrosting device for a dual-evaporator refrigerator, a dual-evaporator refrigerator, and a control method, which can solve the problems of insufficient utilization of the heat generated by the refrigerator and low energy utilization efficiency in existing dual-evaporator refrigerators.

[0004] In a first aspect, embodiments of this application provide a defrosting device for a dual-evaporator refrigerator, applied to a dual-evaporator refrigerator, wherein the dual-evaporator refrigerator has two parallel refrigeration evaporators, including: The defrosting air duct has its air outlet connected to the refrigeration evaporator and its air inlet located in the heat generation area of ​​the dual evaporator refrigerator compressor. The defrosting track is located between the compressor and condenser of the dual evaporator refrigerator and the air inlet of the defrosting air duct; A defrosting gas delivery assembly is movably mounted on the defrosting track; During defrosting operation, the defrosting gas delivery assembly is moved between the compressor and the air inlet of the defrosting duct, and the defrosting gas delivery assembly is activated to deliver the heat generated by the compressor into the defrosting duct to defrost the refrigeration evaporator; during cooling operation, the defrosting gas delivery assembly is moved between the compressor and the condenser, and the defrosting gas delivery assembly is activated to cool the condenser.

[0005] In some embodiments, the defrosting device of the dual evaporator refrigerator further includes a hot air inlet disposed on the compressor compartment partition, one side of the hot air inlet facing the compressor and being separate from the compressor, and the other side of the hot air inlet being connected to the defrosting air duct.

[0006] In some embodiments, the defrosting track is a T-shaped track, with the head of the T-shaped track located between the hot air inlet and the compressor, and the belly of the T-shaped track located between the compressor and the condenser.

[0007] In some embodiments, the defrosting device for a dual-evaporator refrigerator further includes two evaporator precooling pipes, one end of which is connected to the outlet of one of the refrigeration evaporators, and the other end of which is connected to the inlet of the other refrigeration evaporator. A precooling control valve is provided on the evaporator precooling pipe.

[0008] In some embodiments, the precooling control valve is a precooling check valve, which is used to prevent refrigerant from flowing from the inlet of one of the refrigeration evaporators to the outlet of the other refrigeration evaporator.

[0009] In some embodiments, the defrosting device for a dual-evaporator refrigerator further includes a temperature sensor located at the outlet of the evaporator, the temperature sensor being used to detect the refrigerant temperature at the outlet of the evaporator.

[0010] In some embodiments, the defrosting duct is provided with a defrosting air inlet and a defrosting air outlet, the defrosting air inlet and the defrosting air outlet being located on both sides of the refrigeration evaporator, and the defrosting air inlet and the defrosting air outlet being used to control the opening and closing of the defrosting duct.

[0011] In some embodiments, the defrosting gas delivery assembly includes; Defrosting fans are used to transport gas; A sliding fixing buckle is located at the bottom of the defrosting fan and installed on the defrosting track, used to move and fix the defrosting fan.

[0012] In some embodiments, the dual-evaporator refrigerator defrosting device further includes: A front switching valve, whose inlet end is connected to the exhaust port of the compressor and whose exhaust end is connected to the inlet of the two refrigeration evaporators, is used to selectively connect the inlet of one of the refrigeration evaporators to the exhaust port of the compressor. The rear switching valve has its inlet end connected to the outlet of the two refrigeration evaporators and its exhaust end connected to the suction port of the compressor, and is used to selectively connect the outlet of one of the refrigeration evaporators to the suction port of the compressor.

[0013] Secondly, embodiments of this application provide a dual-evaporator refrigerator, including a dual-evaporator refrigerator defrosting device as described in any one of the first aspects.

[0014] Thirdly, embodiments of this application provide a method for controlling a defrosting device in a dual-evaporator refrigerator, applied to a dual-evaporator refrigerator defrosting device as described in any one of the first aspects, comprising: Check if the running refrigeration evaporator needs defrosting; If a running refrigeration evaporator needs to be defrosted, then a defrosting evaporator is obtained. Move the defrosting gas delivery assembly between the compressor and the air inlet of the defrosting duct where the evaporator to be defrosted is located; The defrosting gas delivery assembly is activated to deliver the heat generated by the compressor into the defrosting air duct where the evaporator to be defrosted is located, so as to defrost the evaporator to be defrosted.

[0015] In some embodiments, moving the defrosting gas delivery assembly between the compressor and the air inlet of the defrosting duct where the evaporator to be defrosted is located further includes: Connect the outlet of the unused evaporator to the suction port of the compressor to pre-cool the unused evaporator with the refrigerant in the defrosting evaporator; Detect the refrigerant temperature at the outlet of a non-operating evaporator; If the refrigerant temperature is lower than the preset switching temperature, the inlet of the non-operating evaporator is connected to the outlet of the compressor to switch the operating evaporator to the non-operating evaporator.

[0016] In some embodiments, before activating the defrost gas delivery assembly to deliver the heat generated by the compressor into the defrost duct where the evaporator to be defrosted is located, to defrost the evaporator to be defrosted, the method further includes: Open the defrost inlet and defrost outlet doors in the defrost duct where the evaporator to be defrosted is located.

[0017] In some embodiments, detecting whether a running refrigeration evaporator needs defrosting further includes: If the operating refrigeration evaporator does not require defrosting, the defrosting gas delivery assembly is moved between the compressor and the condenser; The defrosting gas delivery assembly is activated to cool the condenser.

[0018] The technical solutions provided in this application have the following advantages compared with the prior art: The defrosting device, refrigerator, and control method for a dual-evaporator refrigerator provided in this application embodiment address the issues of insufficient heat utilization and low energy efficiency in existing dual-evaporator refrigerators by placing the defrosting track between the compressor and condenser, and the air inlet of the defrosting duct. During defrosting, the defrosting gas delivery assembly is moved between the compressor and the air inlet of the defrosting duct, and activated to deliver heat generated by the compressor into the defrosting duct to defrost the evaporator. This utilizes the compressor's heat as a defrosting heat source, avoiding direct heat dissipation and achieving closed-loop energy utilization within the refrigerator system. During cooling, the defrosting gas delivery assembly is moved between the compressor and the condenser, and activated to cool the condenser, accelerating heat dissipation and reducing its operating temperature, thereby reducing the compressor's operating power. This solves the problems of underutilization of heat generated by the refrigerator and low energy efficiency in existing dual-evaporator refrigerators. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 A system structure diagram of a dual-evaporator refrigerator defrosting device provided in an embodiment of this application; Figure 2 This is a schematic diagram of the defrosting process provided in an embodiment of this application; Figure 3 This is a schematic diagram of the refrigeration operating conditions provided in one embodiment of this application; Figure 4 This is a schematic diagram of the movement of the defrosting gas delivery component under defrosting conditions provided in one embodiment of this application; Figure 5 This is a schematic diagram of the movement of a defrosting gas delivery component under refrigeration conditions according to an embodiment of this application; Figure 6A flowchart illustrating a defrosting device control method for a dual-evaporator refrigerator provided in an embodiment of this application; Figure 7 A flowchart of a defrosting device control method for a dual-evaporator refrigerator provided in another embodiment of this application.

[0023] Figure label: 1101, Defrosting A-type air duct; 1102, Defrosting B air duct; 120. Defrosting track; 130. Defrosting fan; 140. Evaporator precooling piping; 150. Pre-cooling control valve; 160. Front switching valve; 170. Rear switching valve; 180. Hot air inlet; 210. Condenser; 220. Compressor; 230. Refrigeration evaporator; 240. Capillary tube. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0026] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0027] Frost-free refrigerators rely on a built-in fan to drive airflow through the evaporator to exchange heat and cool the compartments. During long-term operation, the evaporator surface continuously exchanges heat with the air inside the refrigerator. Moisture in the air condenses and freezes on the evaporator surface, forming a thick frost layer. As a poor conductor of heat, this frost significantly increases the thermal resistance between the evaporator and the air inside the refrigerator, drastically reducing heat exchange efficiency. This, in turn, leads to a decrease in the refrigerator's cooling performance and an increase in energy consumption.

[0028] Traditional air-cooled refrigerators generally use a single evaporator structure. This structure requires interrupting the normal cooling cycle during the defrosting stage, and the frost layer is melted by turning on an electric heating device or introducing high-temperature air. During this process, the temperature in the cooling compartment will rise significantly, which not only disrupts the low-temperature stable environment required for food preservation, affecting the shelf life and quality of food, but also further increases the overall energy consumption of the machine due to the frequent start and stop of the cooling cycle.

[0029] To address the cooling interruption caused by defrosting in single-evaporator refrigerators, existing technologies are gradually exploring the use of dual-evaporator structures. This involves two evaporators alternating between cooling and defrosting operations, theoretically achieving continuous cooling. However, existing dual-evaporator systems still face several technical bottlenecks in practical applications: 1) The flow path switching mechanism is not well-designed, easily resulting in delayed switching response and fluctuations in cooling capacity; 2) The heat generated during defrosting is not effectively recovered and utilized, leading to energy waste and low energy efficiency; 3) Defrosting timing often uses a fixed time interval control strategy, failing to adjust according to the actual operating conditions of the evaporators. These shortcomings ultimately result in significant temperature fluctuations within the refrigerator compartment, preventing the full realization of the technical advantages of the dual-evaporator structure and hindering further improvements in the preservation performance and energy efficiency of air-cooled refrigerators.

[0030] Firstly, such as Figure 1-5 As shown, to address the aforementioned technical problems, this application provides a defrosting device for a dual-evaporator refrigerator, applicable to a dual-evaporator refrigerator. The dual-evaporator refrigerator has two parallel refrigeration evaporators 230, including: The defrosting air duct has its air outlet connected to the refrigeration evaporator 230, and its air inlet located in the heat generation area of ​​the dual evaporator refrigerator compressor 220. The defrosting track 120 is located between the compressor 220 and the condenser 210 of the dual evaporator refrigerator and the air inlet of the defrosting air duct. The defrosting gas delivery assembly is movably mounted on the defrosting track 120; During defrosting operation, the defrosting gas delivery assembly is moved between the compressor 220 and the air inlet of the defrosting air duct, and the defrosting gas delivery assembly is activated to deliver the heat generated by the compressor 220 into the defrosting air duct to defrost the refrigeration evaporator 230; during cooling operation, the defrosting gas delivery assembly is moved between the compressor 220 and the condenser 210, and the defrosting gas delivery assembly is activated to cool the condenser 210.

[0031] It should be noted that there are usually two defrosting air ducts (i.e., defrosting air duct A 1101 and defrosting air duct B 1102). The two defrosting air ducts are respectively connected to two refrigeration evaporators 230. In the defrosting condition, the defrosting gas delivery component is moved to the air inlet of the compressor 220 between the compressor 220 and the air inlet of defrosting air duct A 1101 / defrosting air duct B 1102 through the defrosting track 120. It can directly recover the operating waste heat of the compressor 220 and accurately deliver it to the surface of the refrigeration evaporator 230 that needs to be defrosted through the corresponding air duct, replacing the traditional electric heating. Alternatively, a high-temperature refrigerant backflush defrosting mode can be used, providing more direct and even heat supply, resulting in faster and more thorough defrosting. Simultaneously, the dual evaporators can alternate between cooling and defrosting, preventing interruptions in the refrigeration cycle, effectively suppressing temperature fluctuations in the compartments, and ensuring a stable low-temperature environment necessary for food preservation. In refrigeration mode, the defrosting gas delivery component is moved between the compressor 220 and the condenser 210, accelerating airflow, enhancing the heat dissipation of the condenser 210, improving refrigerant condensation efficiency, optimizing the overall refrigeration cycle energy efficiency ratio, and resulting in faster cooling.

[0032] It should be noted that by adopting a movable defrosting gas delivery component and a dual-condition switching track design, the complex refrigerant reversing valve group and independent defrosting heating module in the existing technology are replaced. The system structure is simpler, reducing the risk points such as valve leakage and heater failure, and lowering the equipment failure rate and maintenance costs. Moreover, the condition switching is achieved through the physical movement of the component, and the control logic is simple and reliable, without the need for complex refrigerant flow regulation algorithms.

[0033] In some embodiments, the defrosting device of the dual evaporator refrigerator further includes a hot air inlet 180 disposed on the compressor compartment partition. One side of the hot air inlet 180 faces the compressor 220 and is separated from the compressor 220, while the other side of the hot air inlet 180 is connected to the defrosting air duct.

[0034] It should be noted that both defrosting ducts (i.e., defrosting duct A 1101 and defrosting duct B 1102) are connected to the hot air inlet 180. Typically, the size of the hot air inlet 180 is larger than the cross-sectional size of the defrosting duct so that it can be connected to the defrosting duct. By "separating and corresponding" the hot air inlet 180 with the compressor 220, the vibration of the compressor 220 during operation is prevented from being directly transmitted to the duct, and the heat dissipated by the compressor 220 is captured to the maximum extent, reducing heat loss. At the same time, the hot air inlet 180 is directly connected to the defrosting duct, so that the recovered waste heat can be quickly and without redundancy delivered to the target evaporator.

[0035] In some embodiments, the defrosting track 120 is a T-shaped track, with the head of the T-shaped track located between the hot air inlet 180 and the compressor 220, and the belly of the T-shaped track located between the compressor 220 and the condenser 210.

[0036] It should be noted that the "head + belly" layout of the T-shaped track allows the defrosting gas delivery component to move only a short distance between the two target stations (hot air inlet 180 side / condenser 210 side), which shortens the switching stroke, avoids interruption of heat / cold supply during the switching process, and ensures continuous cooling and timely defrosting. In addition, the compact structure of the T-shaped track can make full use of the space between "compressor 220 - condenser 210 - hot air inlet 180" in the compressor compartment, without the need to reserve an additional installation area for long-distance tracks, which is in line with the design trend of refrigerator miniaturization and thinning.

[0037] It should be noted that by precisely aligning the head of the track with the "hot air inlet 180-compressor 220" area, the defrosting fan 130 can maximize the recovery of waste heat from the compressor 220 after it is moved into position. By aligning the belly of the track with the heat dissipation path of "compressor 220-condenser 210", the fan can directly act on the heat dissipation airflow of the condenser 210 after it is in position. The functional adaptability under the two working conditions is stronger, improving the waste heat recovery efficiency and the heat dissipation efficiency of the condenser 210.

[0038] In some embodiments, the defrosting device for a dual-evaporator refrigerator further includes two evaporator precooling pipes 140. One end of the evaporator precooling pipe 140 is connected to the outlet of a refrigeration evaporator 230, and the other end of the evaporator precooling pipe 140 is connected to the inlet of another refrigeration evaporator 230. A precooling control valve 150 is provided on the evaporator precooling pipe 140.

[0039] It should be noted that the evaporator precooling pipe 140 is used to guide the refrigerant in the defrosting evaporator (i.e., the operating refrigeration evaporator 230) to the non-operating refrigeration evaporator 230 for precooling. After receiving the low-temperature refrigerant through the precooling pipe, the non-operating refrigeration evaporator 230 can be pre-cooled to a range close to its operating temperature. When it switches to refrigeration mode, it can immediately enter a high-efficiency refrigeration state without waiting for the refrigerant to be recharged and cooled down. The alternation between the two evaporators is smoother and can avoid the refrigeration "downtime". In addition, the residual refrigerant in the defrosting evaporator (which may have been wasted by heating during defrosting) is reused through the evaporator precooling pipe 140, which improves the refrigerant recycling rate.

[0040] In some embodiments, the precooling control valve 150 is a precooling check valve, which is used to prevent refrigerant from flowing from the inlet of one refrigeration evaporator 230 to the outlet of another refrigeration evaporator 230.

[0041] It should be noted that the one-way flow characteristic of the precooling check valve can force the refrigerant to flow along the preset path of "outlet of the evaporator that needs to be defrosted → inlet of the evaporator that is not in operation", avoiding refrigerant backflow caused by pressure difference changes between the two evaporators or fan switching disturbances; and avoiding refrigerant "short circuit" circulation between the two evaporators, ensuring that the refrigerant output by the compressor 220 can circulate efficiently along the preset path of the refrigeration system, further reducing the overall energy consumption of the unit and improving the refrigeration energy efficiency ratio.

[0042] It should be noted that, compared to electrically controlled valves that require real-time adjustment of the opening, the precooling check valve is a purely mechanical structure that does not require complex sensor feedback or electronic control programs. It can automatically open or close simply by the pressure difference of the refrigerant itself, which reduces the number of electronic control components used, lowers the risk of circuit failure and program misjudgment, simplifies the overall control algorithm, and improves the reliability and stability of the device operation.

[0043] In some embodiments, the defrosting device for a dual-evaporator refrigerator further includes a temperature sensor located at the outlet of the evaporator 230, the temperature sensor being used to detect the refrigerant temperature at the outlet of the evaporator 230.

[0044] It should be noted that when the refrigerant of the defrosting evaporator precools the non-operating evaporator (i.e., the non-operating refrigeration evaporator 230), the temperature sensor detects the refrigerant temperature at the outlet of the non-operating evaporator in real time. When the refrigerant temperature drops to the preset switching temperature, the system immediately connects the inlet of the evaporator to the exhaust port of the compressor 220 to complete the switching of refrigeration conditions. This can avoid the low evaporator start-up refrigeration efficiency caused by insufficient precooling, or the waste of cooling capacity caused by excessive precooling. It ensures that the non-operating evaporator can quickly enter the high-efficiency refrigeration state after switching. The two evaporators alternate without interruption, completely eliminating the refrigeration gap period and effectively suppressing room temperature fluctuations.

[0045] It should be noted that the temperature sensor's detection data serves as the core basis for determining the operating condition switch, replacing the traditional fixed-time switching mode. The switching node can be flexibly adjusted based on the actual pre-cooling effect (refrigerant temperature) of the non-operating evaporator 230. In high humidity environments, the evaporator that needs defrosting has a large amount of frost, and the pre-cooling refrigerant has sufficient cooling capacity, allowing the switching temperature to be reached more quickly. In low humidity environments, the amount of frost is small, and the pre-cooling time can be shortened accordingly. This dynamic control method can avoid ineffective pre-cooling and redundant cooling, further reducing the overall energy consumption of the unit.

[0046] In some embodiments, the defrosting duct is provided with a defrosting air inlet and a defrosting air outlet, which are located on both sides of the refrigeration evaporator 230, and are used to control the opening and closing of the defrosting duct.

[0047] It should be noted that during defrosting, the defrosting inlet and outlet are opened simultaneously, allowing the waste heat from the compressor 220, introduced through the hot air inlet 180, to flow directionally along the defrosting duct across the surface of the evaporator to be defrosted, concentrating the heat on the frost layer. During cooling, the defrosting inlet and outlet are closed simultaneously, completely isolating the defrosting duct from the refrigeration system. This prevents low-temperature refrigeration air from entering the defrosting duct and causing cooling loss, and also prevents high-temperature air from entering the compartment through the duct, eliminating temperature disturbances during the cooling process and further improving the temperature uniformity of the compartment.

[0048] It should be noted that defrosting duct A 1101 has a defrosting inlet door A4 and a defrosting outlet door A3, defrosting duct B 1102 has a defrosting inlet door B4 and a defrosting outlet door B3, and the refrigeration evaporator 230 is also connected to the refrigeration duct. The refrigeration duct is equipped with a refrigeration inlet door and a refrigeration outlet door. The refrigeration evaporator 230A has a refrigeration inlet door A2 and a refrigeration outlet door A1, and the refrigeration evaporator 230B has a refrigeration inlet door B2 and a refrigeration outlet door B1. The refrigeration inlet door and the refrigeration outlet door are used to control the opening and closing of the refrigeration duct.

[0049] In some embodiments, the defrosting gas delivery assembly includes; Defrosting fan 130 is used to transport gas; A sliding fixing buckle is located at the bottom of the defrosting fan 130 and installed on the defrosting track 120, used to move and fix the defrosting fan 130.

[0050] It should be noted that the sliding fixing buckle can slide smoothly along the defrost track 120, driving the defrost fan 130 to quickly switch to the target position of "compressor 220-hot air inlet 180" or "compressor 220-condenser 210" without any jamming or deviation during the movement; at the same time, the sliding fixing buckle has a stable locking function, and the defrost fan 130 can be tightly fixed to the track after it is in place, avoiding the fan displacement caused by the vibration of the compressor 220 or the impact of airflow, ensuring stable delivery of waste heat airflow under defrosting conditions, and continuous enhancement of heat dissipation airflow of condenser 210 under refrigeration conditions.

[0051] It should be noted that, as Figure 4 As shown, when moving the defrosting gas delivery assembly from between the compressor 220 and the condenser 210 to between the compressor 220 and the hot air inlet 180, the defrosting fan 130 is usually first slid upward along the belly of the T-shaped track. When the top of the defrosting fan 130 reaches the head of the T-shaped track, the top of the defrosting fan 130 is slid to the left of the head of the track, and the lower part of the defrosting fan 130 continues to slide upward. When both ends of the defrosting fan 130 reach the head of the track, the entire defrosting fan 130 is moved to the right between the compressor 220 and the hot air inlet 180.

[0052] It should be noted that, as Figure 5 As shown, when moving the defrosting gas delivery assembly from between the compressor 220 and the hot air inlet 180 to between the compressor 220 and the condenser 210, the defrosting fan 130 is usually moved to the left along the head of the track to the left side of the track belly. Then, the right end of the defrosting fan 130 is moved downward along the track belly and the left end of the defrosting fan 130 is moved to the right. When the left end of the defrosting fan 130 moves to the top of the track belly, the defrosting fan 130 is moved downward to between the compressor 220 and the condenser 210.

[0053] In some embodiments, the defrosting device for a dual-evaporator refrigerator further includes: The front switching valve 160 has its inlet end connected to the exhaust port of the compressor 220 and its exhaust end connected to the inlet of the two refrigeration evaporators 230, and is used to selectively connect the inlet of one refrigeration evaporator 230 to the exhaust port of the compressor 220. The rear switching valve 170 has its inlet end connected to the outlet of the two refrigeration evaporators 230 and its exhaust end connected to the suction port of the compressor 220, and is used to selectively connect the outlet of one refrigeration evaporator 230 to the suction port of the compressor 220.

[0054] It should be noted that the front switching valve 160 is connected to the exhaust port of the compressor 220 in sequence through the capillary tube 240, the condenser 210, and the evaporator 220. In the defrosting condition, the rear switching valve 170 first opens the outlet of the non-operating evaporator 230 to the suction port of the compressor 220, so that the refrigerant in the evaporator to be defrosted flows into the non-operating evaporator (i.e., the non-operating evaporator 230) through the evaporator precooling pipe 140 to complete the precooling. When the temperature sensor detects that the refrigerant temperature at the outlet of the non-operating evaporator is lower than the preset switching temperature, the front switching valve 160 immediately opens the inlet of the non-operating evaporator to the exhaust port of the compressor 220, realizing a seamless switching of the evaporator refrigeration condition, completely avoiding refrigeration interruption, and greatly improving the food preservation effect.

[0055] It should be noted that after the front switching valve 160 and the rear switching valve 170 cut off the refrigerant inlet and outlet channels of the evaporator to be defrosted, the evaporator is completely isolated from the refrigeration system. The waste heat from the compressor 220 delivered by the defrosting gas delivery component can be concentrated on the frost layer, and there will be no heat loss due to refrigerant flow. At the same time, the high temperature generated during defrosting is avoided from affecting the refrigerant state of the refrigeration system, which can effectively shorten the defrosting time. The on / off state of the front switching valve 160 and the rear switching valve 170 can form a closed-loop linkage control with the position movement of the defrosting gas delivery component and the detection data of the temperature sensor, without the need for complex multi-branch flow regulation.

[0056] Secondly, such as Figure 1As shown, this application embodiment provides a dual-evaporator refrigerator, including a dual-evaporator refrigerator defrosting device as described in any of the first aspects, and further including: The compressor 220 has its suction port connected to the rear switching valve 170 of the defrosting device of the dual evaporator refrigerator. The condenser 210 has its inlet end connected to the exhaust port of the compressor 220; The capillary tube 240 is connected at one end to the outlet end of the condenser 210 and at the other end to the front switching valve 160 of the defrosting device of the dual evaporator refrigerator. The refrigeration evaporator 230 is connected in parallel between the front switching valve 160 and the rear switching valve 170 of the defrosting device of the dual evaporator refrigerator.

[0057] The defrosting device for the dual-evaporator refrigerator includes: The defrosting air duct has its air outlet connected to the refrigeration evaporator 230, and its air inlet located in the heat generation area of ​​the dual evaporator refrigerator compressor 220. The defrosting track 120 is located between the compressor 220 and the condenser 210 of the dual evaporator refrigerator and the air inlet of the defrosting air duct. The defrosting gas delivery assembly is movably mounted on the defrosting track 120; During defrosting operation, the defrosting gas delivery assembly is moved between the compressor 220 and the air inlet of the defrosting air duct, and the defrosting gas delivery assembly is activated to deliver the heat generated by the compressor 220 into the defrosting air duct to defrost the refrigeration evaporator 230; during cooling operation, the defrosting gas delivery assembly is moved between the compressor 220 and the condenser 210, and the defrosting gas delivery assembly is activated to cool the condenser 210.

[0058] It should be noted that there are usually two defrosting air ducts (i.e., defrosting air duct A 1101 and defrosting air duct B 1102). The two defrosting air ducts are respectively connected to two refrigeration evaporators 230. In the defrosting condition, the defrosting gas delivery component is moved to the air inlet of the compressor 220 between the compressor 220 and the air inlet of defrosting air duct A 1101 / defrosting air duct B 1102 through the defrosting track 120. It can directly recover the operating waste heat of the compressor 220 and accurately deliver it to the surface of the refrigeration evaporator 230 that needs to be defrosted through the corresponding air duct, replacing the traditional electric heating. Alternatively, a high-temperature refrigerant backflush defrosting mode can be used, providing more direct and even heat supply, resulting in faster and more thorough defrosting. Simultaneously, the dual evaporators can alternate between cooling and defrosting, preventing interruptions in the refrigeration cycle, effectively suppressing temperature fluctuations in the compartments, and ensuring a stable low-temperature environment necessary for food preservation. In refrigeration mode, the defrosting gas delivery component is moved between the compressor 220 and the condenser 210, accelerating airflow, enhancing the heat dissipation of the condenser 210, improving refrigerant condensation efficiency, optimizing the overall refrigeration cycle energy efficiency ratio, and resulting in faster cooling.

[0059] It should be noted that by adopting a movable defrosting gas delivery component and a dual-condition switching track design, the complex refrigerant reversing valve group and independent defrosting heating module in the existing technology are replaced. The system structure is simpler, reducing the risk points such as valve leakage and heater failure, and lowering the equipment failure rate and maintenance costs. Moreover, the condition switching is achieved through the physical movement of the component, and the control logic is simple and reliable, without the need for complex refrigerant flow regulation algorithms.

[0060] In some embodiments, the defrosting device of the dual evaporator refrigerator further includes a hot air inlet 180 disposed on the compressor compartment partition. One side of the hot air inlet 180 faces the compressor 220 and is separated from the compressor 220, while the other side of the hot air inlet 180 is connected to the defrosting air duct.

[0061] It should be noted that both defrosting ducts (i.e., defrosting duct A 1101 and defrosting duct B 1102) are connected to the hot air inlet 180. Typically, the size of the hot air inlet 180 is larger than the cross-sectional size of the defrosting duct so that it can be connected to the defrosting duct. By "separating and corresponding" the hot air inlet 180 with the compressor 220, the vibration of the compressor 220 during operation is prevented from being directly transmitted to the duct, and the heat dissipated by the compressor 220 is captured to the maximum extent, reducing heat loss. At the same time, the hot air inlet 180 is directly connected to the defrosting duct, so that the recovered waste heat can be quickly and without redundancy delivered to the target evaporator.

[0062] In some embodiments, the defrosting track 120 is a T-shaped track, with the head of the T-shaped track located between the hot air inlet 180 and the compressor 220, and the belly of the T-shaped track located between the compressor 220 and the condenser 210.

[0063] It should be noted that the "head + belly" layout of the T-shaped track allows the defrosting gas delivery component to move only a short distance between the two target stations (hot air inlet 180 side / condenser 210 side), which shortens the switching stroke, avoids interruption of heat / cold supply during the switching process, and ensures continuous cooling and timely defrosting. In addition, the compact structure of the T-shaped track can make full use of the space between "compressor 220 - condenser 210 - hot air inlet 180" in the compressor compartment, without the need to reserve an additional installation area for long-distance tracks, which is in line with the design trend of refrigerator miniaturization and thinning.

[0064] It should be noted that by precisely aligning the head of the track with the "hot air inlet 180-compressor 220" area, the defrosting fan 130 can maximize the recovery of waste heat from the compressor 220 after it is moved into position. By aligning the belly of the track with the heat dissipation path of "compressor 220-condenser 210", the fan can directly act on the heat dissipation airflow of the condenser 210 after it is in position. The functional adaptability under the two working conditions is stronger, improving the waste heat recovery efficiency and the heat dissipation efficiency of the condenser 210.

[0065] In some embodiments, the defrosting device for a dual-evaporator refrigerator further includes two evaporator precooling pipes 140. One end of the evaporator precooling pipe 140 is connected to the outlet of a refrigeration evaporator 230, and the other end of the evaporator precooling pipe 140 is connected to the inlet of another refrigeration evaporator 230. A precooling control valve 150 is provided on the evaporator precooling pipe 140.

[0066] It should be noted that the evaporator precooling pipe 140 is used to guide the refrigerant in the defrosting evaporator (i.e., the operating refrigeration evaporator 230) to the non-operating refrigeration evaporator 230 for precooling. After receiving the low-temperature refrigerant through the precooling pipe, the non-operating refrigeration evaporator 230 can be pre-cooled to a range close to its operating temperature. When it switches to refrigeration mode, it can immediately enter a high-efficiency refrigeration state without waiting for the refrigerant to be recharged and cooled down. The alternation between the two evaporators is smoother and can avoid the refrigeration "downtime". In addition, the residual refrigerant in the defrosting evaporator (which may have been wasted by heating during defrosting) is reused through the evaporator precooling pipe 140, which improves the refrigerant recycling rate.

[0067] In some embodiments, the precooling control valve 150 is a precooling check valve, which is used to prevent refrigerant from flowing from the inlet of one refrigeration evaporator 230 to the outlet of another refrigeration evaporator 230.

[0068] It should be noted that the one-way flow characteristic of the precooling check valve can force the refrigerant to flow along the preset path of "outlet of the evaporator that needs to be defrosted → inlet of the evaporator that is not in operation", avoiding refrigerant backflow caused by pressure difference changes between the two evaporators or fan switching disturbances; and avoiding refrigerant "short circuit" circulation between the two evaporators, ensuring that the refrigerant output by the compressor 220 can circulate efficiently along the preset path of the refrigeration system, further reducing the overall energy consumption of the unit and improving the refrigeration energy efficiency ratio.

[0069] It should be noted that, compared to electrically controlled valves that require real-time adjustment of the opening, the precooling check valve is a purely mechanical structure that does not require complex sensor feedback or electronic control programs. It can automatically open or close simply by the pressure difference of the refrigerant itself, which reduces the number of electronic control components used, lowers the risk of circuit failure and program misjudgment, simplifies the overall control algorithm, and improves the reliability and stability of the device operation.

[0070] In some embodiments, the defrosting device for a dual-evaporator refrigerator further includes a temperature sensor located at the outlet of the evaporator 230, the temperature sensor being used to detect the refrigerant temperature at the outlet of the evaporator 230.

[0071] It should be noted that when the refrigerant of the defrosting evaporator precools the non-operating evaporator (i.e., the non-operating refrigeration evaporator 230), the temperature sensor detects the refrigerant temperature at the outlet of the non-operating evaporator in real time. When the refrigerant temperature drops to the preset switching temperature, the system immediately connects the inlet of the evaporator to the exhaust port of the compressor 220 to complete the switching of refrigeration conditions. This can avoid the low evaporator start-up refrigeration efficiency caused by insufficient precooling, or the waste of cooling capacity caused by excessive precooling. It ensures that the non-operating evaporator can quickly enter the high-efficiency refrigeration state after switching. The two evaporators alternate without interruption, completely eliminating the refrigeration gap period and effectively suppressing room temperature fluctuations.

[0072] It should be noted that the temperature sensor's detection data serves as the core basis for determining the operating condition switch, replacing the traditional fixed-time switching mode. The switching node can be flexibly adjusted based on the actual pre-cooling effect (refrigerant temperature) of the non-operating evaporator 230. In high humidity environments, the evaporator that needs defrosting has a large amount of frost, and the pre-cooling refrigerant has sufficient cooling capacity, allowing the switching temperature to be reached more quickly. In low humidity environments, the amount of frost is small, and the pre-cooling time can be shortened accordingly. This dynamic control method can avoid ineffective pre-cooling and redundant cooling, further reducing the overall energy consumption of the unit.

[0073] In some embodiments, the defrosting duct is provided with a defrosting air inlet and a defrosting air outlet, which are located on both sides of the refrigeration evaporator 230, and are used to control the opening and closing of the defrosting duct.

[0074] It should be noted that during defrosting, the defrosting inlet and outlet are opened simultaneously, allowing the waste heat from the compressor 220, introduced through the hot air inlet 180, to flow directionally along the defrosting duct across the surface of the evaporator to be defrosted, concentrating the heat on the frost layer. During cooling, the defrosting inlet and outlet are closed simultaneously, completely isolating the defrosting duct from the refrigeration system. This prevents low-temperature refrigeration air from entering the defrosting duct and causing cooling loss, and also prevents high-temperature air from entering the compartment through the duct, eliminating temperature disturbances during the cooling process and further improving the temperature uniformity of the compartment.

[0075] It should be noted that defrosting duct A 1101 has a defrosting inlet door A4 and a defrosting outlet door A3, defrosting duct B 1102 has a defrosting inlet door B4 and a defrosting outlet door B3, and the refrigeration evaporator 230 is also connected to the refrigeration duct. The refrigeration duct is equipped with a refrigeration inlet door and a refrigeration outlet door. The refrigeration evaporator 230A has a refrigeration inlet door A2 and a refrigeration outlet door A1, and the refrigeration evaporator 230B has a refrigeration inlet door B2 and a refrigeration outlet door B1. The refrigeration inlet door and the refrigeration outlet door are used to control the opening and closing of the refrigeration duct.

[0076] In some embodiments, the defrosting gas delivery assembly includes; Defrosting fan 130 is used to transport gas; A sliding fixing buckle is located at the bottom of the defrosting fan 130 and installed on the defrosting track 120, used to move and fix the defrosting fan 130.

[0077] It should be noted that the sliding fixing buckle can slide smoothly along the defrost track 120, driving the defrost fan 130 to quickly switch to the target position of "compressor 220-hot air inlet 180" or "compressor 220-condenser 210" without any jamming or deviation during the movement; at the same time, the sliding fixing buckle has a stable locking function, and the defrost fan 130 can be tightly fixed to the track after it is in place, avoiding the fan displacement caused by the vibration of the compressor 220 or the impact of airflow, ensuring stable delivery of waste heat airflow under defrosting conditions, and continuous enhancement of heat dissipation airflow of condenser 210 under refrigeration conditions.

[0078] It should be noted that, as Figure 4 As shown, when moving the defrosting gas delivery assembly from between the compressor 220 and the condenser 210 to between the compressor 220 and the hot air inlet 180, the defrosting fan 130 is usually first slid upward along the belly of the T-shaped track. When the top of the defrosting fan 130 reaches the head of the T-shaped track, the top of the defrosting fan 130 is slid to the left of the head of the track, and the lower part of the defrosting fan 130 continues to slide upward. When both ends of the defrosting fan 130 reach the head of the track, the entire defrosting fan 130 is moved to the right between the compressor 220 and the hot air inlet 180.

[0079] It should be noted that, as Figure 5 As shown, when moving the defrosting gas delivery assembly from between the compressor 220 and the hot air inlet 180 to between the compressor 220 and the condenser 210, the defrosting fan 130 is usually moved to the left along the head of the track to the left side of the track belly. Then, the right end of the defrosting fan 130 is moved downward along the track belly and the left end of the defrosting fan 130 is moved to the right. When the left end of the defrosting fan 130 moves to the top of the track belly, the defrosting fan 130 is moved downward to between the compressor 220 and the condenser 210.

[0080] In some embodiments, the defrosting device for a dual-evaporator refrigerator further includes: The front switching valve 160 has its inlet end connected to the exhaust port of the compressor 220 and its exhaust end connected to the inlet of the two refrigeration evaporators 230, and is used to selectively connect the inlet of one refrigeration evaporator 230 to the exhaust port of the compressor 220. The rear switching valve 170 has its inlet end connected to the outlet of the two refrigeration evaporators 230 and its exhaust end connected to the suction port of the compressor 220, and is used to selectively connect the outlet of one refrigeration evaporator 230 to the suction port of the compressor 220.

[0081] It should be noted that the front switching valve 160 is connected to the exhaust port of the compressor 220 in sequence through the capillary tube 240, the condenser 210, and the evaporator 220. In the defrosting condition, the rear switching valve 170 first opens the outlet of the non-operating evaporator 230 to the suction port of the compressor 220, so that the refrigerant in the evaporator to be defrosted flows into the non-operating evaporator (i.e., the non-operating evaporator 230) through the evaporator precooling pipe 140 to complete the precooling. When the temperature sensor detects that the refrigerant temperature at the outlet of the non-operating evaporator is lower than the preset switching temperature, the front switching valve 160 immediately opens the inlet of the non-operating evaporator to the exhaust port of the compressor 220, realizing a seamless switching of the evaporator refrigeration condition, completely avoiding refrigeration interruption, and greatly improving the food preservation effect.

[0082] It should be noted that after the front switching valve 160 and the rear switching valve 170 cut off the refrigerant inlet and outlet channels of the evaporator to be defrosted, the evaporator is completely isolated from the refrigeration system. The waste heat from the compressor 220 delivered by the defrosting gas delivery component can be concentrated on the frost layer, and there will be no heat loss due to refrigerant flow. At the same time, the high temperature generated during defrosting is avoided from affecting the refrigerant state of the refrigeration system, which can effectively shorten the defrosting time. The on / off state of the front switching valve 160 and the rear switching valve 170 can form a closed-loop linkage control with the position movement of the defrosting gas delivery component and the detection data of the temperature sensor, without the need for complex multi-branch flow regulation.

[0083] Thirdly, such as Figure 6 As shown, this application provides a method for controlling a defrosting device in a dual-evaporator refrigerator, applied to a dual-evaporator refrigerator defrosting device as described in any one of the first aspects, comprising: S101: Check if the running refrigeration evaporator 230 needs defrosting; S102: If the operating refrigeration evaporator 230 needs to be defrosted, then a defrosting evaporator is obtained; S103: Move the defrosting gas delivery assembly between the compressor 220 and the air inlet of the defrosting duct where the evaporator to be defrosted is located; S104: Start the defrosting gas delivery assembly to deliver the heat generated by the compressor 220 into the defrosting air duct where the evaporator to be defrosted is located, so as to defrost the evaporator to be defrosted.

[0084] It should be noted that the need for defrosting of the running evaporator 230 can be determined by parameters such as evaporator outlet temperature, running time, or frost thickness. This replaces the traditional fixed-interval defrosting mode. In high humidity environments, defrosting can be triggered in a timely manner to avoid excessive frost accumulation that affects heat exchange efficiency. In low humidity environments, the defrosting timing is delayed to reduce ineffective operations. When it is determined that a certain evaporator 230 needs defrosting, there is no need to interrupt the entire refrigeration cycle. The evaporator that needs defrosting is heated separately, and the system switches to another evaporator 230 for refrigeration. Combined with the alternating design of the dual evaporators, the refrigeration window caused by defrosting is completely eliminated, the temperature fluctuation of the compartment is reduced, and the low-temperature stable environment required for food preservation is ensured.

[0085] It should be noted that by precisely moving the defrosting gas delivery component between the compressor 220 and the air inlet of the defrosting duct where the evaporator to be defrosted is located, the waste heat generated by the operation of the compressor 220 can be directly recovered as a defrosting heat source without the need for additional electric heating elements. This not only realizes the resource utilization of waste heat, but also avoids the diffusion of defrosting heat into the compartment, which is in line with the trend of energy-saving development of home appliances.

[0086] In some embodiments, moving the defrosting gas delivery assembly between the compressor 220 and the air inlet end of the defrosting duct where the evaporator to be defrosted is located further includes: The outlet of the unused evaporator 230 is connected to the suction port of the compressor 220 so as to pre-cool the unused evaporator 230 with the refrigerant in the evaporator that needs to be defrosted. Detect the refrigerant temperature at the outlet of the non-operating evaporator 230; If the refrigerant temperature is lower than the preset switching temperature, the inlet of the non-operating evaporator 230 is connected to the outlet of the compressor 220 to switch the operating evaporator to the non-operating evaporator 230.

[0087] It should be noted that before starting defrosting, the low-temperature refrigerant in the evaporator to be defrosted is first introduced into the non-operating evaporator 230 for pre-cooling. Once the refrigerant temperature at the outlet of the non-operating evaporator 230 drops to the preset switching temperature, the non-operating evaporator 230 is then connected to the compressor 220 exhaust port. This ensures that the non-operating evaporator 230 has already cooled to near its operating temperature range before officially switching to refrigeration mode. After switching, there is no need to wait for the refrigerant to cool down; a stable cooling capacity can be output immediately, completely avoiding the temperature fluctuations in the room caused by the delayed evaporator cooling response during the initial defrosting phase. Fluctuations; and the evaporator's operating condition has been switched before defrosting starts, so the new refrigeration evaporator 230 can enter the operating state in advance. When the defrosting gas delivery component is in place and defrosting starts, there is always an evaporator in the refrigerator that is refrigerating stably, which completely eliminates the problem of refrigeration interruption in the early stage of defrosting and ensures that the low temperature environment required for food preservation remains stable. Among them, the connection between the outlet of the non-operating refrigeration evaporator 230 and the suction port of the compressor 220 can be achieved by the rear switching valve 170, and the connection between the inlet of the non-operating refrigeration evaporator 230 and the exhaust port of the compressor 220 can be achieved by the front switching valve 160.

[0088] It should be noted that before starting defrosting, the pre-cooling effect of the non-operating evaporator is confirmed by temperature detection. The operating mode is switched only when the refrigerant temperature reaches the standard. This avoids the problem of low refrigeration efficiency after switching the evaporator due to insufficient pre-cooling, or the compressor 220 experiencing instantaneous overload due to sudden load changes.

[0089] In some embodiments, before activating the defrosting gas delivery assembly to deliver the heat generated by the compressor 220 into the defrosting duct where the evaporator to be defrosted is located, to defrost the evaporator to be defrosted, the method further includes: Open the defrost inlet and defrost outlet doors in the defrost duct where the evaporator to be defrosted is located.

[0090] It should be noted that opening the defrost inlet and defrost outlet before defrosting can pre-open the complete airflow path of "hot air inlet 180 → defrost duct → evaporator to be defrosted → duct outlet". After the defrost gas delivery component is started, the waste heat airflow generated by the compressor 220 can flow directionally and quickly across the surface of the evaporator to be defrosted along the preset channel, avoiding the airflow from stagnating in the duct or spreading to other areas. Before opening the defrost inlet and defrost outlet in the defrost duct where the evaporator to be defrosted is located, the refrigeration inlet and refrigeration outlet of the evaporator to be defrosted must be closed.

[0091] It should be noted that before defrosting, only the air duct damper corresponding to the evaporator that needs to be defrosted is opened, while the air duct damper of the other refrigeration evaporator 230 remains closed. This effectively isolates the defrosting hot air passage from the refrigeration cold air passage, preventing the high-temperature airflow during the defrosting stage from entering the refrigeration side compartment and causing temperature fluctuations. At the same time, it avoids the low-temperature airflow on the refrigeration side flowing back into the defrosting air duct, causing heat loss. This ensures that the defrosting and refrigeration modes operate in parallel without interference, further improving the temperature stability of the compartment.

[0092] It should be noted that the damper opening operation is pre-positioned, allowing for standardized timing linkage with steps such as the relocation of the defrosting gas delivery components and the switching of evaporator precooling. For example, after the system determines the defrosting requirement, it first completes the evaporator operating condition switching and damper opening, and then starts the fan to deliver heat. The sequence of actions of each component is clear, and the triggering conditions are well-defined, avoiding defrosting delays or heat waste caused by disordered timing, thus improving the accuracy and reliability of the overall system control.

[0093] In some embodiments, detecting whether the operating refrigeration evaporator 230 needs defrosting further includes: If the operating refrigeration evaporator 230 does not require defrosting, the defrosting gas delivery assembly is moved between the compressor 220 and the condenser 210; The defrosting gas delivery assembly is activated to cool the condenser 210.

[0094] It should be noted that the defrosting gas delivery component is not a "dedicated component" that only works under defrosting conditions, but a "general-purpose component" that can be switched to the cooling position of the condenser 210 (i.e., between the compressor 220 and the condenser 210) according to system requirements. In the steady-state cooling phase when the evaporator does not require defrosting, the defrosting gas delivery component enhances the heat dissipation effect of the condenser 210 by accelerating the airflow around the compressor 220 and the condenser 210, avoiding resource waste caused by idle components, and improving the overall component integration and utilization rate of the device.

[0095] It should be noted that the system can automatically switch the work position of the defrosting gas delivery component according to the defrosting needs of the evaporator: when defrosting is required, waste heat recovery defrosting is performed, and when defrosting is not required, condenser 210 cooling is performed. Through this control logic, the operating status of the refrigerator can be dynamically matched to avoid problems such as compressor 220 overload and reduced cooling effect caused by insufficient heat dissipation of condenser 210. At the same time, it can prevent jamming faults caused by long-term idleness of defrosting components, and improve the stability and service life of the whole machine.

[0096] It should be noted that, for example, such as Figure 1 As shown, taking evaporator A (located within evaporation chamber A) as an example, the defrosting control method is as follows (see attached diagram). Figure 7The process is as follows: When evaporator A is running, both switching valves (front switching valve 160 and rear switching valve 170) are switched to flow path A of evaporator A. When it is detected that evaporator A needs to defrost, the evaporator A defrost mode is entered, and the rear switching valve 170 is switched to flow path B of evaporator B. At this time, the low-temperature refrigerant passing through evaporator A will pass through evaporator B and then return to compressor 220 to pre-cool evaporator B while keeping evaporator A refrigerating. The outlet temperature Tb of evaporator B is detected, and the preset switching temperature T0 is used. When Tb ≤ T0, evaporator B has cooled down. The cooling dampers A1 and A2 of evaporator A are closed, and the defrosting dampers A3 and A4 of evaporator A are opened. The cooling dampers B1 and B2 of evaporator B are opened, and the front switching valve 160 switches to flow path B. At this time, evaporator B cools normally, and hot air defrosting of evaporator A begins. The cooling fan (defrosting fan 130) is switched to the defrosting position (between the compressor 220 and the hot air inlet 180), blowing high-temperature air near the compressor 220 into the defrosting duct of evaporator A and onto the evaporator A for rapid defrosting. After defrosting is detected to be complete, the defrosting dampers A3 and A4 of evaporator A are closed, and the cooling fan is switched to the cooling position to cool the compressor 220 while simultaneously assisting in heat dissipation of the condenser 210 (the defrosting mode of evaporator B is the same).

[0097] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0098] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0099] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A defrosting device for a dual-evaporator refrigerator, characterized in that, Applied to a dual-evaporator refrigerator, the dual-evaporator refrigerator has two refrigeration evaporators connected in parallel, including: The defrosting air duct has its air outlet connected to the refrigeration evaporator and its air inlet located in the heat generation area of ​​the dual evaporator refrigerator compressor. The defrosting track is located between the compressor and condenser of the dual evaporator refrigerator and the air inlet of the defrosting air duct; A defrosting gas delivery assembly is movably mounted on the defrosting track; During defrosting operation, the defrosting gas delivery assembly is moved between the compressor and the air inlet of the defrosting duct, and the defrosting gas delivery assembly is activated to deliver the heat generated by the compressor into the defrosting duct to defrost the refrigeration evaporator; during cooling operation, the defrosting gas delivery assembly is moved between the compressor and the condenser, and the defrosting gas delivery assembly is activated to cool the condenser.

2. The defrosting device for a dual-evaporator refrigerator according to claim 1, characterized in that, It also includes a hot air inlet located on the compressor compartment partition, one side of which faces the compressor and is separate from it, and the other side of which is connected to the defrosting duct.

3. The defrosting device for a dual-evaporator refrigerator according to claim 2, characterized in that, The defrosting track is a T-shaped track, with the head of the T-shaped track located between the hot air inlet and the compressor, and the belly of the T-shaped track located between the compressor and the condenser.

4. The defrosting device for a dual-evaporator refrigerator according to claim 1, characterized in that, It also includes two evaporator precooling pipelines, one end of which is connected to the outlet of one of the refrigeration evaporators, and the other end of which is connected to the inlet of the other refrigeration evaporator. A precooling control valve is provided on the evaporator precooling pipeline.

5. The defrosting device for a dual-evaporator refrigerator according to claim 4, characterized in that, The precooling control valve is a precooling check valve, which is used to prevent refrigerant from flowing from the inlet of one of the refrigeration evaporators to the outlet of the other refrigeration evaporator.

6. The defrosting device for a dual-evaporator refrigerator according to claim 1, characterized in that, It also includes a temperature sensor located at the outlet of the refrigeration evaporator, the temperature sensor being used to detect the refrigerant temperature at the outlet of the refrigeration evaporator.

7. The defrosting device for a dual-evaporator refrigerator according to claim 1, characterized in that, The defrosting duct is equipped with a defrosting air inlet and a defrosting air outlet, which are located on both sides of the refrigeration evaporator. The defrosting air inlet and the defrosting air outlet are used to control the opening and closing of the defrosting duct.

8. The defrosting device for a dual-evaporator refrigerator according to claim 1, characterized in that, The defrosting gas delivery assembly includes; Defrosting fans are used to transport gas; A sliding fixing buckle is located at the bottom of the defrosting fan and installed on the defrosting track, used to move and fix the defrosting fan.

9. The defrosting device for a dual-evaporator refrigerator according to any one of claims 1-8, characterized in that, Also includes: A front switching valve, whose inlet end is connected to the exhaust port of the compressor and whose exhaust end is connected to the inlet of the two refrigeration evaporators, is used to selectively connect the inlet of one of the refrigeration evaporators to the exhaust port of the compressor. The rear switching valve has its inlet end connected to the outlet of the two refrigeration evaporators and its exhaust end connected to the suction port of the compressor, and is used to selectively connect the outlet of one of the refrigeration evaporators to the suction port of the compressor.

10. A refrigerator with dual evaporators, characterized in that, Includes a dual-evaporator refrigerator defrosting device as described in any one of claims 1-9.

11. A method for controlling the defrosting device of a dual-evaporator refrigerator, characterized in that, The defrosting device for a dual-evaporator refrigerator as described in any one of claims 1-9 comprises: Check if the running refrigeration evaporator needs defrosting; If a running refrigeration evaporator needs to be defrosted, then a defrosting evaporator is obtained. Move the defrosting gas delivery assembly between the compressor and the air inlet of the defrosting duct where the evaporator to be defrosted is located; The defrosting gas delivery assembly is activated to deliver the heat generated by the compressor into the defrosting air duct where the evaporator to be defrosted is located, so as to defrost the evaporator to be defrosted.

12. The defrosting device control method for a dual-evaporator refrigerator according to claim 11, characterized in that, The step of moving the defrosting gas delivery assembly between the compressor and the air inlet of the defrosting duct where the evaporator to be defrosted is located also includes: Connect the outlet of the unused evaporator to the suction port of the compressor to pre-cool the unused evaporator with the refrigerant in the defrosting evaporator; Detect the refrigerant temperature at the outlet of a non-operating evaporator; If the refrigerant temperature is lower than the preset switching temperature, the inlet of the non-operating evaporator is connected to the outlet of the compressor to switch the operating evaporator to the non-operating evaporator.

13. The defrosting device control method for a dual-evaporator refrigerator according to claim 11, characterized in that, Before starting the defrosting gas delivery assembly to deliver the heat generated by the compressor into the defrosting duct where the evaporator to be defrosted is located, in order to defrost the evaporator to be defrosted, the procedure further includes: Open the defrost inlet and defrost outlet doors in the defrost duct where the evaporator to be defrosted is located.

14. The defrosting device control method for a dual-evaporator refrigerator according to claim 11, characterized in that, The method of detecting whether a running refrigeration evaporator needs defrosting also includes: If the operating refrigeration evaporator does not require defrosting, the defrosting gas delivery assembly is moved between the compressor and the condenser; The defrosting gas delivery assembly is activated to cool the condenser.

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