Refrigeration system having defrosting function, defrosting method, and refrigerator

Abstract

A refrigeration system having a defrosting function, a defrosting method, and a refrigerator. The refrigeration system comprises a compressor (100), a condenser (110), a first evaporator (132), and a second evaporator (142); an output port of the condenser (110) is communicated with a second solenoid valve (111); outlets of the second solenoid valve (111) are respectively communicated with a first refrigeration branch (130) and second refrigeration branches (140); and an output port of the compressor (100) is further connected to a first solenoid valve (120), and outlets of the first solenoid valve (120) are respectively communicated with the two refrigeration branches. High-temperature gas output by the compressor (100) is directly output, by means of the first solenoid valve (120), to the evaporator needing to be defrosted, and defrosting is not performed by means of an electric heater, so that energy consumption can be reduced, and the temperature of a refrigerator compartment will not be greatly increased during defrosting; and since output ends of the first refrigeration branch (130) and of the second refrigeration branch (140) are connected to different return pipes, defrosting and refrigeration can be implemented separately, and are controlled separately without interfering with each other, and the refrigeration of other refrigeration compartments is not affected during defrosting.

Description

A refrigeration system with defrosting function, a defrosting method and a refrigerator Technical Field

[0001] This invention relates to the field of refrigeration appliance technology, and in particular to a refrigeration system with defrosting function, a defrosting method, and a refrigerator. Background Technology

[0002] Currently, the most common defrosting method used in frost-free refrigerators is to use an electric heater to heat the evaporator. This method has the characteristics of high heat dissipation, which can easily lead to a significant increase in the temperature of the refrigerator compartments, high energy consumption, and low safety. In addition, the refrigeration system is often a series-parallel refrigeration system, that is, the freezer compartment is the downstream part of the refrigeration flow path; when the freezer compartment is defrosting, the other two refrigeration compartments cannot cool at the same time, which passively affects the cooling effect of the other refrigeration compartments. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a refrigeration system with a defrosting function, which can defrost without the aid of an electric heater, and the defrosting process does not affect the refrigeration of other refrigeration compartments.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A refrigeration system with a defrosting function includes: a compressor, the output port of which is connected to a condenser and a first solenoid valve respectively; the output port of the condenser is connected to a second solenoid valve, the second solenoid valve having at least two second outlets, the second solenoid valve being used to control the on / off state of the second outlets; the two second outlets are respectively connected to a first refrigeration branch and a second refrigeration branch; the first refrigeration branch includes a first capillary tube and a first evaporator arranged sequentially along the flow direction of the medium, the second refrigeration branch includes a second capillary tube, a second evaporator, and a third solenoid valve arranged sequentially along the flow direction of the medium; the output port of the first evaporator is connected to a first return pipe, and the output port of the second evaporator is connected to the third solenoid valve. The third solenoid valve is connected to a solenoid valve and has two third outlets. The third solenoid valve is used to control the opening and closing of the third outlets. One of the third outlets is connected to a second return gas pipe, and the other third outlet is connected to the inlet of the first evaporator or the first return gas pipe. The first return gas pipe and the second return gas pipe are both connected to the inlet of the compressor. The first solenoid valve has a first outlet corresponding to the first refrigeration branch and the second refrigeration branch, and the first solenoid valve is used to control the opening and closing of the first outlet. The first outlet is connected to the corresponding first refrigeration branch and the second refrigeration branch, and the connection positions are respectively located between the corresponding first capillary tube and the first evaporator, and between the corresponding second capillary tube and the second evaporator.

[0006] Furthermore, a manifold is connected to the outlet ends of the first and second return gas pipes, and a liquid reservoir is connected to the output end of the manifold. The liquid reservoir is used to retain liquid media and prevent liquid media from entering the compressor.

[0007] Furthermore, a one-way valve is provided on the first return gas pipe, which only allows the medium on the first return gas pipe to flow out towards the outlet of the first evaporator.

[0008] Furthermore, the second refrigeration branch is provided with two outlets, one of the third outlets on the two third solenoid valves is connected to the inlet of the first evaporator, and the other third outlet is connected to the same first return gas pipe.

[0009] The present invention also provides a defrosting method, comprising the following steps:

[0010] S1, monitor the cooling time of each compartment of the refrigerator and determine whether the cumulative cooling time of each compartment exceeds the preset cooling threshold:

[0011] If so, the refrigeration chamber will enter defrosting mode;

[0012] If not, the humidity in the cooling room is continuously monitored, and the time is divided into multiple consecutive time periods to obtain the average humidity of the i-th time period. Within a preset time period, the number of times m is found that the average humidity difference between adjacent time periods is less than a preset humidity difference is determined, and it is then determined whether the number m is greater than a preset threshold.

[0013] If so, the refrigeration chamber will enter defrosting mode;

[0014] If not, return to step S1;

[0015] S2, after entering defrost mode, the second solenoid valve cuts off the medium output from the condenser from entering the refrigeration branch corresponding to the defrost mode refrigeration chamber, and the first solenoid valve controls the medium output from the compressor to enter the refrigeration branch corresponding to the defrost mode refrigeration chamber, and the entry position is located between the capillary tube and the evaporator of the corresponding refrigeration branch.

[0016] Furthermore, it also includes the following steps:

[0017] S3, monitor the temperature of the evaporator corresponding to the cooling chamber and determine whether the temperature is greater than the first preset temperature threshold:

[0018] If so, exit defrost mode;

[0019] If not, then determine whether the duration of the defrost mode exceeds a preset time threshold:

[0020] If so, exit defrost mode;

[0021] If not, then keep the defrost mode running.

[0022] Furthermore, the refrigeration chamber includes a first refrigeration chamber and a second refrigeration chamber;

[0023] When the first refrigeration chamber is in defrost mode and the second refrigeration chamber is in refrigeration mode, or when the second refrigeration chamber is in defrost mode and the first refrigeration chamber is in refrigeration mode, step S2 further includes: the medium output from the outlet of the first evaporator of the first refrigeration chamber enters the first return gas pipe, the medium output from the outlet of the second evaporator of the second refrigeration chamber enters the second return gas pipe, the medium from the first return gas pipe and the second return gas pipe merge into the manifold, mix, enter the liquid receiver, and then return to the compressor. The liquid receiver is used to intercept the liquid medium and prevent the liquid medium from entering the compressor.

[0024] Furthermore, the monitoring of the cooling time of each cooling compartment of the refrigerator includes:

[0025] Obtain the cooling time of each cooling chamber and the temperature information of each cooling chamber during the cooling time;

[0026] Based on the cooling time and temperature information, feedback control calculations are performed using a preset PID algorithm;

[0027] Based on the feedback control calculation results, the cooling strategy for each cooling chamber is determined, and the cumulative cooling time of each cooling chamber is judged to be greater than the preset cooling threshold based on the cooling strategy.

[0028] Furthermore, after acquiring the cooling time of each cooling chamber and the temperature information of each cooling chamber within the cooling time, the method further includes:

[0029] Based on the cooling time and temperature information, and the preset matrix construction rules, a time-temperature matrix is ​​constructed.

[0030] The time-temperature matrix is ​​matched with a preset standard matrix;

[0031] If the matching result does not meet the preset matching conditions, it is determined that the cooling time and / or the temperature information are abnormal.

[0032] The present invention also provides a refrigerator, including a refrigeration system with a defrosting function.

[0033] The present invention has the following beneficial effects:

[0034] The high-temperature gas output from the compressor is directly supplied to the evaporator that needs to be defrosted through the first solenoid valve, without the need for an electric heater, thus reducing energy consumption and avoiding a significant increase in the refrigerator compartment temperature during defrosting. Furthermore, since the outputs of the first and second refrigeration branches are connected to different circuits (first return gas pipe and second return gas pipe), one can defrost while the other refrigerates. They can be controlled independently without interference, and defrosting does not affect the refrigeration of other compartments.

[0035] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0036] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0037] Figure 1 is a schematic diagram of the overall connection structure of the present invention;

[0038] Figure 2 is a schematic diagram of the first state of the present invention;

[0039] Figure 3 is a schematic diagram of the second state of the present invention;

[0040] Figure 4 is a schematic diagram of the third state of the present invention;

[0041] Figure 5 is a schematic diagram of the fourth state of the present invention;

[0042] Figure 6 is a schematic diagram of the fifth state of the present invention;

[0043] Figure 7 is a schematic diagram of the sixth state of the present invention;

[0044] Figure 8 is a schematic diagram of the seventh state of the present invention;

[0045] Figure 9 is a schematic diagram of the eighth state of the present invention;

[0046] Figure 10 is a schematic diagram of the overall structure of the refrigerator of the present invention;

[0047] Figure 11 is a schematic flowchart of the defrosting method of the present invention.

[0048] Legend:

[0049] Compressor 100, condenser 110, second solenoid valve 111, dryer filter 112, first solenoid valve 120, first refrigeration branch 130, first capillary tube 131, first evaporator 132, second refrigeration branch 140, second capillary tube 141, second evaporator 142, third solenoid valve 143, first return pipe 150, one-way valve 151, second return pipe 160, manifold 170, liquid receiver 180;

[0050] Refrigerator compartment 200;

[0051] Variable temperature room 300;

[0052] Freezer compartment 400. Detailed Implementation

[0053] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0055] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0056] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0057] Please refer to Figure 1. A preferred embodiment of the refrigeration system with defrosting function provided by the present invention includes a compressor 100. The output port of the compressor 100 is connected to a condenser 110 and a first solenoid valve 120 respectively. The output port of the condenser 110 is connected to a second solenoid valve 111. The second solenoid valve 111 has at least two second outlets. The second solenoid valve 111 is used to control the opening and closing of the second outlets. It can be understood that the inlet of the second solenoid valve 111 is connected to the output port of the condenser 110. Controlling the opening and closing of the second outlets means controlling the connection or disconnection between the inlet and the second outlet of the second solenoid valve 111. Moreover, the opening and closing control of the second solenoid valve 111 for any second outlet is independent, that is, the second solenoid valve 111 can control one second outlet to be connected or disconnected, and the other second outlet can be connected or disconnected. Two second outlets are respectively connected to a first refrigeration branch 130 and a second refrigeration branch 140; the first refrigeration branch 130 includes a first capillary tube 131 and a first evaporator 132 arranged sequentially along the flow direction of the medium; the second refrigeration branch 140 includes a second capillary tube 141, a second evaporator 142 and a third solenoid valve 143 arranged sequentially along the flow direction of the medium; the output port of the first evaporator 132 is connected to a first return gas pipe 150, and the output port of the second evaporator 142 is connected to the third solenoid valve 143, the third solenoid valve 143 having two... The third solenoid valve 143 has three outlets. It is used to control the opening and closing of the third outlet. One of the third outlets is connected to the second return gas pipe 160, and the other third outlet is connected to the inlet of the first evaporator 132 or the first return gas pipe 150. It can be understood that the inlet of the third solenoid valve 143 is connected to the output port of the second evaporator 142. Controlling the opening and closing of the third outlet means controlling the connection or disconnection between the inlet and the third outlet of the third solenoid valve 143. The two third outlets of the third solenoid valve 143 cannot be connected at the same time. Only one of the third outlets can be connected, and the other needs to be disconnected.Both the first return pipe 150 and the second return pipe 160 are connected to the inlet of the compressor 100; the first solenoid valve 120 has a first outlet corresponding to the first refrigeration branch 130 and the second refrigeration branch 140 respectively. The first solenoid valve 120 is used to control the opening and closing of the first outlet. It can be understood that the inlet of the first solenoid valve 120 is connected to the output port of the compressor 100, and controlling the opening and closing of the first outlet means controlling the connection or disconnection between the inlet and the first outlet of the first solenoid valve 120; and the opening and closing control of the first solenoid valve 120 for any first outlet is independent, that is, the first solenoid valve 120 controls the opening and closing of either first outlet independently. The solenoid valve 120 can control one of the first outlets to be connected or disconnected, and the other first outlet can also be connected or disconnected. The first outlets are connected to the corresponding first refrigeration branch 130 and the second refrigeration branch 140 respectively, and the connection positions are respectively located between the corresponding first capillary tube 131 and the first evaporator 132, and between the corresponding second capillary tube 141 and the second evaporator 142. During defrosting, the second electric valve 111 closes the outlet of the corresponding refrigeration chamber, and the high-temperature and high-pressure gas medium output from the first outlet of the first solenoid valve 120 directly enters the evaporator for defrosting.

[0058] The present invention provides a refrigeration system with a defrosting function. The high-temperature gas output from the compressor 100 is directly output to the evaporator that needs to be defrosted through the first solenoid valve 120, without the aid of an electric heater, thereby reducing energy consumption and the heat generated by the refrigerator as a whole, and reducing the heat dissipation pressure of the refrigerator. Furthermore, since the output ends of the first refrigeration branch 130 and the second refrigeration branch 140 are connected to different circuits (first return pipe 150 and second return pipe 160), one can defrost while the other refrigerates. They can be controlled independently without interference, and defrosting does not affect the refrigeration of other refrigeration compartments.

[0059] Referring to Figure 1, in some embodiments of the present invention, a manifold 170 is connected to the outlet ends of the first return gas pipe 150 and the second return gas pipe 160, and a liquid receiver 180 is connected to the output end of the manifold 170. The liquid receiver 180 is used to trap liquid in the medium, reducing the liquid medium compressor 100. After the medium in the first return gas pipe 150 and the second return gas pipe 160 is fully mixed by the manifold 170, the low temperature medium and the superheated medium are fully mixed, avoiding the compressor liquid slugging caused by the low return gas temperature, and also avoiding the entry of cold and superheated gas into the compressor, which can easily cause the compressor overload trip protection and affect the normal operation of the compressor. The liquid receiver 180 can effectively separate the liquid medium and avoid compressor liquid slugging.

[0060] Referring to Figure 1, in some embodiments of the present invention, a one-way valve 151 is provided on the first return gas pipe 150. The one-way valve 151 only allows the medium on the first return gas pipe 150 to flow out towards the outlet direction of the first evaporator 132, thereby preventing the high-pressure medium from flowing back to the first evaporator 132 and affecting the normal operation of the first evaporator 132.

[0061] Referring to Figure 1, in some embodiments of the present invention, a dryer filter 112 is provided between the condenser 110 and the second solenoid valve 111. The dryer filter 112 is used to remove residual moisture in the refrigeration system, prevent ice blockage, reduce the corrosive effect of moisture on the refrigeration system, and also filter out impurities and moisture in the refrigeration system to prevent the compressor from being damaged by dirt blockage or ice blockage.

[0062] Referring to Figure 1, in some embodiments of the present invention, the second refrigeration branch 140 is provided in two parts. One of the third outlets on the two third solenoid valves 143 is connected to the inlet of the first evaporator 132, and the other third outlet is connected to the same first return gas pipe 150, thereby sharing the same first return gas pipe 150 and simplifying the piping. The inlet of the first evaporator 132 is connected to the third outlets of the two third solenoid valves 143, the output port of the first capillary tube 131, and the first outlet of the first solenoid valve 120, which can effectively simplify the piping connection design. When the first evaporator 132 and the second evaporator 142 operate in the same mode, i.e., both are in cooling mode or defrosting mode, the medium output from the second evaporator 142 enters the first evaporator 132 through the corresponding third solenoid valve 143 and eventually flows back to the compressor. When the first evaporator 132 and the second evaporator 142 operate in different modes, i.e., they are in cooling mode and defrosting mode respectively, the medium output from the second evaporator 142 enters the second return pipe 160 through the corresponding third solenoid valve 143, bypassing the first evaporator 132 to avoid interfering with the normal operation of the first evaporator 132.

[0063] Referring to FIG11, the present invention also provides a defrosting method, including steps S1 and S2.

[0064] S1, monitor the cooling time of each cooling compartment in the refrigerator and determine whether the cumulative cooling time of each cooling compartment is greater than the preset cooling threshold:

[0065] If so, meaning the cumulative cooling time of the cooling chamber exceeds the preset cooling threshold, the cooling chamber enters defrosting mode; that is, when the cumulative cooling time of the cooling chamber is too long, defrosting is required. For example, if the preset cooling threshold is 28 hours, and the cumulative cooling time of the cooling chamber exceeds 28 hours, it is determined that the cooling time is too long and defrosting is required.

[0066] If not, meaning the cumulative cooling time of the cooling chamber is not greater than the preset cooling threshold, then the humidity of the cooling chamber is continuously monitored, and the time is divided into multiple consecutive time periods to obtain the average humidity of the i-th time period. Let i be a positive integer, and the duration of each time segment be the same. Within the preset duration, determine the number of times m that the average humidity difference between adjacent time segments is less than the preset humidity difference, and determine whether the number m is greater than the preset threshold.

[0067] If yes, the refrigeration chamber enters defrosting mode; that is, if the number of times m is greater than the preset threshold, it means that within the preset time period, the average humidity difference between adjacent time periods is less than the preset humidity difference multiple times. This indicates that the humidity change in the refrigeration chamber is small for a long time, which means that the defrosting capacity of the evaporator has decreased, and it can be determined that the evaporator has been severely frosted and needs to be defrosted. If no, return to step S1; continue to judge the defrosting conditions.

[0068] Specifically, in a specific embodiment of the present invention, the preset duration is 30 minutes, the preset quantity threshold is 3, and the duration of each time segment is 5 minutes. Therefore, there are 6 time segments within the preset duration, and the average humidity difference is calculated for 5 groups of adjacent time segments. Finally, the results of comparing the 5 groups of average humidity differences with the preset humidity difference are obtained, and the number of times m is less than the preset humidity difference is determined. Then, m is compared with the preset quantity threshold 3 to determine whether the humidity change meets the defrosting requirements. Of course, the preset duration and the duration of each time segment can be designed as needed.

[0069] S2, after entering defrost mode, the second solenoid valve 111 cuts off the refrigerant (cold medium) output from the condenser 110 from entering the refrigeration branch corresponding to the defrost mode refrigeration chamber. The first solenoid valve 120 controls the high-temperature, high-pressure gas output from the compressor 100 to enter the refrigeration branch corresponding to the defrost mode refrigeration chamber, and the entry position is located between the capillary tube and the evaporator of the corresponding refrigeration branch. That is, the refrigerant output from the condenser 110 cannot enter the refrigeration branch corresponding to the defrost mode refrigeration chamber at this time. Instead, the high-temperature, high-pressure gas directly output from the compressor 100 enters the refrigeration branch corresponding to the defrost mode refrigeration chamber to heat up the evaporator of the corresponding refrigeration chamber for defrosting. In a further embodiment of the present invention, step S3 is included after step S2.

[0070] S3, monitor the temperature of the evaporator corresponding to the cooling chamber and determine whether the temperature is greater than the first preset temperature threshold:

[0071] If yes, meaning the evaporator temperature is greater than the first preset temperature threshold, indicating that the defrosting effect has met expectations, then the defrosting mode will exit; otherwise, it will be determined whether the duration of the defrosting mode exceeds the preset time threshold.

[0072] If so, exit defrost mode;

[0073] If not, the defrosting mode will continue to operate until the evaporator temperature exceeds the first preset temperature threshold or the duration of the defrosting mode exceeds the preset time threshold, at which point the defrosting mode will exit.

[0074] First, it determines whether the evaporator temperature has reached the required level. If it has, it exits the defrosting mode. If it has not reached the required level, it determines the duration of the defrosting mode. If the duration is too long, it will not be conducive to the freezing or refrigeration effect of the cooling chamber. Therefore, it will re-enter the cooling mode before the defrosting is fully completed to ensure the refrigeration or freezing effect of the cooling chamber and avoid affecting the storage of food in the cooling chamber.

[0075] In a further embodiment of the present invention, the refrigeration chamber includes a first refrigeration chamber and a second refrigeration chamber; when the first refrigeration chamber is in defrost mode and the second refrigeration chamber is in refrigeration mode, or when the second refrigeration chamber is in defrost mode and the first refrigeration chamber is in refrigeration mode, step S2 further includes: the medium output from the outlet of the first evaporator 132 of the first refrigeration chamber enters the first return gas pipe 150, and the medium output from the outlet of the second evaporator 142 of the second refrigeration chamber enters the second return gas pipe 160; the medium from the first return gas pipe 150 and the second return gas pipe 160 merges into the manifold 170, mixes, enters the liquid receiver 180, and then returns to the compressor 100; the liquid receiver 180 is used to trap liquid in the medium to prevent liquid medium from entering the compressor 100. After the medium from the first return gas pipe 150 and the second return gas pipe 160 is fully mixed by the manifold 170, the low-temperature medium and the superheated medium are fully mixed, avoiding the compressor liquid slugging caused by the low return gas temperature, and also avoiding the superheated gas from entering the compressor, which could easily cause the compressor overload trip protection and affect the normal operation of the compressor.

[0076] Of course, in some other embodiments, a temperature judgment option can be added to determine whether to enter the defrosting condition. The temperature judgment can be performed after the humidity judgment, that is, whether the number of judgments m is greater than a preset threshold.

[0077] If so, the refrigeration chamber will enter defrosting mode;

[0078] If not, then a temperature adjustment judgment is performed to determine whether the evaporator temperature has been continuously lower than the second preset temperature threshold T for a period of time.

[0079] If so, then enter defrost mode; that is, if the evaporator temperature is continuously lower than the second preset temperature threshold T for a period of time, then defrosting is required.

[0080] If not, return to step S1; continue to determine the defrosting conditions.

[0081] More preferably, to better control the temperature of each cooling chamber, this embodiment introduces a PID algorithm to regulate the cooling strategy of each cooling chamber, thereby minimizing energy consumption. Specifically, it includes the following steps:

[0082] After monitoring the cooling time of each compartment in the refrigerator, the method also includes:

[0083] Obtain the cooling time of each cooling chamber and the temperature information of each cooling chamber during the cooling time;

[0084] Based on the cooling time and temperature information, feedback control calculations are performed using a preset PID algorithm;

[0085] Based on the feedback control calculation results, the cooling strategy for each cooling chamber is determined, and the cumulative cooling time of each cooling chamber is judged to be greater than the preset cooling threshold based on the cooling strategy.

[0086] Temperature information and cooling time can be monitored and recorded in real time by temperature sensors built into each cooling compartment. For example, temperature data is recorded once per minute and stored in the refrigerator's microcontroller. The PID algorithm calculation process can be implemented by the microcontroller of the refrigerator's central control system. It should be noted that the parameter adjustment process of the PID algorithm can be implemented by simulated annealing algorithm. The cooling strategy is adjusted based on whether the cooling time to reach the preset temperature is greater than the preset cooling threshold.

[0087] To ensure control accuracy and avoid erroneous adjustments caused by sensor errors, further testing can be performed on the cooling time and temperature to determine the accuracy of the cooling time and temperature readings. Specifically, this includes the following steps:

[0088] After obtaining the cooling time of each cooling chamber and the temperature information of each cooling chamber during the cooling time, the method also includes:

[0089] Based on cooling time and temperature information, and preset matrix construction rules, a time-temperature matrix is ​​constructed.

[0090] Match the time-temperature matrix with the preset standard matrix;

[0091] If the matching result does not meet the preset matching conditions, it is determined that there is an anomaly in the cooling time and / or temperature information.

[0092] The construction of the time-temperature matrix can be achieved by first collecting data periodically in a time-temperature format, thus obtaining multiple two-dimensional data sets. For example, [0100, -1] represents 01:00 with a temperature of -1℃. These data sets are then used to construct a matrix P. Let matrix P be... At this time, the pre-stored standard matrix H is Then, matrix P is matched with matrix H. The matching process can be to match whether the difference between corresponding elements of the two matrices is within a preset range (i.e., matching conditions), or to match the correlation between the two matrices. The correlation can be calculated based on a preset correlation coefficient, and then it is determined whether the correlation value is within a preset range, or it can be determined by other methods.

[0093] The working principles under different operating conditions are described below based on Figures 2 to 9.

[0094] The refrigeration circuit includes a first refrigeration circuit 130 and a second refrigeration circuit 140. The first refrigeration compartment is a freezer compartment 400, corresponding to the first refrigeration circuit 130; there are two second refrigeration compartments, namely a variable temperature compartment 300 and a cold storage compartment 200, corresponding to two second refrigeration circuits 140.

[0095] As shown in Figure 2, in the simultaneous cooling state of the refrigerator compartment, variable temperature compartment, and freezer compartment, the first solenoid valve 120 is closed. After the compressor 100 discharges high-temperature gas, it enters the condenser for heat release and cooling, then enters the dryer filter and finally enters the second solenoid valve 111. All three second outlets of the second solenoid valve 111 are connected to the inlet of the second solenoid valve 111. The refrigerant enters the second evaporator in the refrigerator and variable temperature compartments after being throttled by the second capillary tube for heat absorption and cooling. The medium output from the second evaporator 142 enters the first evaporator 132 through the third solenoid valve 143, and then returns to the compressor 100 through the check valve, the first return pipe 150, and the liquid receiver, thus circulating in this manner.

[0096] As shown in Figure 3, the system defrosts in the refrigerator compartment and cools in the freezer and variable temperature compartments. The defrosting flow path is as follows: a portion of the high-temperature, high-pressure gas discharged from the compressor 100 enters the second evaporator 142 in the refrigerator compartment via the first solenoid valve 120, achieving defrosting. The medium output from the second evaporator 142 then enters the second return gas pipe 160 via the third solenoid valve 143. The cooling flow path for the freezer and variable temperature compartments is the same as in Figure 2, with the medium ultimately flowing into the first return gas pipe 150. The media from the first and second return gas pipes 150 merge in the manifold 170 and finally return to the compressor 100 via the receiver, thus completing the cycle.

[0097] As shown in Figure 4, the system defrosts in the variable temperature compartment and cools in the freezer and refrigerator compartments. The defrosting and cooling flow paths can be found in Figure 4.

[0098] As shown in Figure 5, the system defrosts in the freezer compartment and cools in the variable temperature compartment and refrigerator compartment. The defrosting flow is as follows: a portion of the high-temperature, high-pressure gas discharged from the compressor 100 enters the first evaporator 132 in the freezer compartment through the first solenoid valve 120 to defrost the first evaporator 132. The refrigerant then flows into the first return pipe 150 after passing through the first evaporator 132. The cooling flow is as follows: a portion of the high-temperature, high-pressure gas discharged from the compressor 100 enters the condenser 200 for heat release and cooling, then enters the dryer filter and passes through the second solenoid valve 111. The second solenoid valve 111 opens the second outlet of the variable temperature compartment and refrigerator compartment, inputting refrigerant into the second evaporator 142 of the variable temperature compartment and refrigerator compartment to achieve cooling. The refrigerant then passes through the second evaporator 142 and enters the second return pipe 160 through the third solenoid valve 143, thus bypassing the first evaporator 132 in the freezer compartment. The refrigerant from the first return pipe 150 and the second return pipe 160 merges into the manifold 170 and finally returns to the compressor 100 through the receiver, thus completing the cycle.

[0099] As shown in Figure 6, during defrosting in the freezer and variable temperature compartments and refrigeration in the refrigerator compartment, the defrosting flow path is as follows: a portion of the high-temperature and high-pressure gas discharged from the compressor enters the first evaporator 132 in the freezer compartment and the second evaporator 142 in the variable temperature compartment through the first solenoid valve 120 for defrosting. The medium output from the second evaporator 142 in the variable temperature compartment enters the first evaporator 132 through the corresponding third solenoid valve 143. The medium output from the first evaporator 132 is then sent to the first return gas pipe 150. Refrigeration flow path: Another part of the high-temperature and high-pressure gas discharged from the compressor passes through the condenser 200 for heat release and refrigeration, enters the dryer filter, and then passes through the second solenoid valve 111. The second solenoid valve 111 opens the second outlet corresponding to the refrigerator compartment, inputting the refrigerant to the second evaporator 142 corresponding to the refrigerator compartment for refrigeration. The medium output from the second evaporator 142 corresponding to the refrigerator compartment enters the second return gas pipeline 160 through the corresponding third solenoid valve 143. The medium from the first return gas pipeline 150 and the second return gas pipeline 160 merges into the manifold 170 and finally returns to the compressor 100 through the liquid receiver, and the cycle continues.

[0100] As shown in Figure 7, the system defrosts in the freezer and refrigerator compartments, and cools in the variable temperature compartment. The defrosting and cooling flow paths can be found in Figure 7.

[0101] As shown in Figure 8, the system defrosts in the refrigerator compartment and the variable temperature compartment, and cools in the freezer compartment. The defrosting flow path and the cooling flow path can be seen in Figure 8.

[0102] As shown in Figure 9, the system defrosts simultaneously in the refrigerator compartment, the variable temperature compartment, and the freezer compartment. The defrosting flow path and the refrigeration flow path can be referred to in Figure 9.

[0103] The present invention also provides a refrigerator, including a refrigeration system with a defrosting function and a freezer compartment 400, a variable temperature compartment 300, and a refrigerator compartment 200.

[0104] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A refrigeration system with a defrosting function, characterized in that, include: The compressor (100) has its output port connected to the condenser (110) and the first solenoid valve (120), respectively. The condenser (110) has an output port connected to a second solenoid valve (111), which has at least two second outlets and is used to control the opening and closing of the second outlets. The two second outlets are respectively connected to a first refrigeration branch (130) and a second refrigeration branch (140). The first refrigeration branch (130) includes a first capillary tube (131) and a first evaporator (132) arranged sequentially along the flow direction of the medium. The second refrigeration branch (140) includes a second capillary tube (141), a second evaporator (142), and a third solenoid valve (143) arranged sequentially along the flow direction of the medium. The output port of the first evaporator (132) is connected to the first return gas pipe (150), and the output port of the second evaporator (142) is connected to the third solenoid valve (143). The third solenoid valve (143) has two third outlets and is used to control the opening and closing of the third outlets. One of the third outlets is connected to the second return gas pipe (160), and the other third outlet is connected to the inlet of the first evaporator (132) or the first return gas pipe (150). The first return gas pipe (150) and the second return gas pipe (160) are both connected to the inlet of the compressor (100). The first solenoid valve (120) has a first outlet corresponding to the first refrigeration branch (130) and the second refrigeration branch (140). The first solenoid valve (120) is used to control the opening and closing of the first outlet. The first outlet is connected to the corresponding first refrigeration branch (130) and the corresponding second refrigeration branch (140), and the connection position is located between the corresponding first capillary tube (131) and the first evaporator (132), and between the corresponding second capillary tube (141) and the second evaporator (142).

2. The refrigeration system with defrosting function according to claim 1, characterized in that, The outlet ends of the first return gas pipe (150) and the second return gas pipe (160) are connected to a manifold (170), and the output end of the manifold (170) is connected to a liquid reservoir (180). The liquid reservoir (180) is used to intercept liquid media and prevent liquid media from entering the compressor (100).

3. The refrigeration system with defrosting function according to claim 1, characterized in that, The first return gas pipe (150) is provided with a one-way valve (151), which only allows the medium on the first return gas pipe (150) to flow out towards the outlet of the first evaporator (132).

4. The refrigeration system with defrosting function according to claim 1, characterized in that, The second refrigeration branch (140) is provided in two parts. One of the third outlets on the two third solenoid valves (143) is connected to the inlet of the first evaporator (132), and the other third outlet is connected to the same first return gas pipe (150).

5. A defrosting method, characterized in that, Includes the following steps: S1, monitor the cooling time of each compartment of the refrigerator and determine whether the cumulative cooling time of each compartment exceeds the preset cooling threshold: If so, the refrigeration chamber will enter defrosting mode; If not, the humidity in the cooling room is continuously monitored, and the time is divided into multiple consecutive time periods to obtain the average humidity of the i-th time period. Within a preset time period, the number of times m is found that the average humidity difference between adjacent time periods is less than a preset humidity difference is determined, and it is then determined whether the number m is greater than a preset threshold. If so, the refrigeration chamber will enter defrosting mode; If not, return to step S1; S2, after entering the defrost mode, the second solenoid valve (111) cuts off the medium output from the condenser (110) from entering the refrigeration branch corresponding to the defrost mode refrigeration chamber, and the first solenoid valve (120) controls the medium output from the compressor (100) to enter the refrigeration branch corresponding to the defrost mode refrigeration chamber.

6. The defrosting method according to claim 5, characterized in that, Following step S2, the following steps are also included: S3, monitor the temperature of the evaporator corresponding to the cooling chamber and determine whether the temperature is greater than the first preset temperature threshold: If so, exit defrost mode; If not, then determine whether the duration of the defrost mode exceeds a preset time threshold: If so, exit defrost mode; If not, then keep the defrost mode running.

7. The defrosting method according to claim 5, characterized in that, The refrigeration chamber includes a first refrigeration chamber and a second refrigeration chamber; When the first refrigeration chamber is in defrost mode and the second refrigeration chamber is in refrigeration mode, or when the second refrigeration chamber is in defrost mode and the first refrigeration chamber is in refrigeration mode, step S2 further includes: the medium output from the outlet of the first evaporator (132) of the first refrigeration chamber enters the first return gas pipe (150), the medium output from the outlet of the second evaporator (142) of the second refrigeration chamber enters the second return gas pipe (160), the medium from the first return gas pipe (150) and the second return gas pipe (160) merge into the manifold (170), mix, enter the liquid receiver (180), and then return to the compressor (100). The liquid receiver (180) is used to intercept the liquid medium and prevent the liquid medium from entering the compressor (100).

8. The defrosting method according to claim 5, characterized in that, The monitoring of the cooling time of each compartment of the refrigerator includes: Obtain the cooling time of each cooling chamber and the temperature information of each cooling chamber during the cooling time; Based on the cooling time and temperature information, feedback control calculations are performed using a preset PID algorithm; Based on the feedback control calculation results, the cooling strategy for each cooling chamber is determined, and the cumulative cooling time of each cooling chamber is judged to be greater than the preset cooling threshold based on the cooling strategy.

9. The defrosting method according to claim 8, characterized in that, After acquiring the cooling time of each cooling chamber and the temperature information of each cooling chamber within the cooling time, the method further includes: Based on the cooling time and temperature information, and the preset matrix construction rules, a time-temperature matrix is ​​constructed. The time-temperature matrix is ​​matched with a preset standard matrix; If the matching result does not meet the preset matching conditions, it is determined that the cooling time and / or the temperature information are abnormal.

10. A refrigerator, characterized in that, The refrigeration system with defrosting function as described in any one of claims 1 to 4.

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