A refrigerator refrigeration and defrosting control system

Abstract

The present invention discloses a refrigerator refrigeration and defrost control system, comprising a double-suction compressor, a condenser, a drying filter, a refrigeration throttling device, a refrigeration evaporator, a freezing throttling device, a freezing evaporator, and several solenoid valves. The system is provided with a refrigeration and cooling mode, a freezing and cooling mode, a forced refrigeration mode, a refrigeration and defrost mode, and the refrigerator automatically selects the above control modes according to the operating conditions of the refrigerator and the surrounding environment. In the freezing and defrost mode, the refrigerant in the refrigeration evaporator and the refrigerant in the freezing evaporator are first neutralized under the action of a pressure difference, and then the evaporator is defrosted by freezing the high-temperature and high-pressure refrigerant. This improves the defrost efficiency and shortens the defrost time. Compared with electric heating defrosting, the defrost energy consumption is reduced, thereby improving the storage quality of food.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerator control, and in particular to a refrigerator refrigeration and defrosting control system. Background Art

[0002] At present, high-end air-cooled refrigerators all use a dual-system refrigeration cycle to prevent odor transfer inside the refrigerator and reduce product energy consumption. Taking the dual-system air-cooled refrigerator refrigeration cycle as an example, the refrigerator and freezer compartments use their own evaporators and are equipped with their own air ducts. Existing dual-system air-cooled refrigerators mainly defrost by using electric heating tubes. Electric heating tubes are installed on the freezing evaporator and the refrigeration evaporator. After the defrosting conditions are met, the electric heating tubes are turned on to defrost. The use of electric heating for defrosting has the problems of low defrosting efficiency and high energy consumption. It is also easy to cause a sharp rise in the temperature inside the box, which reduces the storage quality of food. Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0003] The purpose of the present invention is to propose a refrigerator refrigeration and defrost control system to solve the problems of low defrosting efficiency and high energy consumption in the existing technology using electric heating defrost, and the problem that it is easy to cause a sharp rise in the temperature inside the box, thereby reducing the storage quality of food.

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

[0005] A refrigerator refrigeration and defrosting control system, the system includes a double-suction compressor, the exhaust port of the double-suction compressor is connected in parallel with three branches;

[0006] The first branch is connected to a condenser, and the end of the first branch is divided into two paths, one path is connected in sequence to the first solenoid valve, the refrigeration throttling device and the input end of the refrigeration evaporator, and the other path is connected in sequence to the second solenoid valve, the freezing throttling device and the input end of the freezing evaporator;

[0007] The second branch is connected to a third solenoid valve, and the end of the second branch is connected to the input end of the refrigeration evaporator;

[0008] The third branch is connected to a fourth solenoid valve, and the end of the third branch is connected to the first interface of the tee;

[0009] The output end of the refrigeration evaporator is connected to the second interface of the tee;

[0010] The third interface of the three-way valve is divided into two paths, one path is connected to the fifth solenoid valve and the first suction port of the double-suction compressor in sequence, and the other path is connected to the sixth solenoid valve and the input end of the refrigeration evaporator in sequence;

[0011] The output end of the refrigeration evaporator is connected to the second suction port of the double-suction compressor.

[0012] Preferably, the system is provided with a refrigeration mode, a freezing mode, a forced refrigeration mode, a refrigeration defrost mode and a freezing defrost mode.

[0013] Preferably, in the refrigeration mode, the first solenoid valve and the fifth solenoid valve are both open, the second solenoid valve, the third solenoid valve, the fourth solenoid valve and the sixth solenoid valve are all closed, and the refrigerant is discharged from the exhaust port of the double-intake compressor, which is condensed in turn by the condenser, throttled by the refrigeration throttling device, evaporated by the refrigeration evaporator and generates cold air, and finally returns to the first intake port of the double-intake compressor.

[0014] Preferably, in the freezing and refrigeration mode, the second solenoid valve is opened, the first solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve and the sixth solenoid valve are all closed, and the refrigerant is discharged from the exhaust port of the double-inhalation compressor, which is condensed in turn by the condenser, throttled by the freezing throttling device, evaporated by the freezing evaporator and generates cold air, and finally returns to the second suction port of the double-inhalation compressor.

[0015] Preferably, in the forced cooling mode, the first solenoid valve, the second solenoid valve and the fifth solenoid valve are all opened, and the third solenoid valve, the fourth solenoid valve and the sixth solenoid valve are all closed. The refrigerant is discharged from the exhaust port of the double-suction compressor, and is divided into two paths after condensation by the condenser. One path is first throttled by the refrigeration throttling device, and then enters the refrigeration evaporator to evaporate and generate cold energy, and finally returns to the first suction port of the double-suction compressor. At the same time, the other path is first throttled by the freezing throttling device, and then enters the freezing evaporator to evaporate and generate cold energy, and finally returns to the second suction port of the double-suction compressor.

[0016] Preferably, in the refrigeration defrost mode, the third solenoid valve and the fifth solenoid valve are both opened, the first solenoid valve, the second solenoid valve, the fourth solenoid valve and the sixth solenoid valve are all closed, and the exhaust port of the double-intake compressor discharges high-temperature refrigerant, which first enters the refrigeration evaporator and then returns to the first intake port of the double-intake compressor.

[0017] Preferably, in the freezing and defrosting mode, the double-suction compressor is first shut down for T1, and T1 is 5-10 minutes. During the shutdown period of the double-suction compressor, the sixth solenoid valve is opened, and the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve are all closed. The refrigerant in the refrigeration evaporator and the refrigerant in the freezing evaporator are neutralized under the action of the pressure difference, and then the double-suction compressor is started. At the same time, the fourth solenoid valve is opened, and the exhaust port of the double-suction compressor discharges the high-temperature refrigerant. The high-temperature refrigerant first enters the freezing evaporator and then returns to the second suction port of the double-suction compressor.

[0018] Preferably, the first branch is connected to a drying filter in series with the condenser.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a refrigerator refrigeration and defrost control system with five control modes. In particular, in the freezing and defrosting mode, the refrigerant in the refrigeration evaporator and the refrigerant in the freezing evaporator are first neutralized under the action of the pressure difference, and then the evaporator is defrosted by freezing the high-temperature and high-pressure refrigerant, which improves the defrosting efficiency and shortens the defrosting time. Compared with electric heating defrosting, it reduces the defrosting energy consumption and improves the storage quality of food. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a schematic structural diagram of the refrigerator control system of the present invention.

[0023] In the figure: 1. Double-suction compressor; 2. Condenser; 3. Dry filter; 4. Refrigeration throttling device; 5. Refrigeration evaporator; 6. Refrigeration throttling device; 7. Refrigeration evaporator; 8. T-joint; 9. First solenoid valve; 10. Second solenoid valve; 11. Third solenoid valve; 12. Fourth solenoid valve; 13. Fifth solenoid valve; 14. Sixth solenoid valve; a. Exhaust port; b. First air intake port; c. Second air intake port; d. First interface; e. Second interface; f. Third interface. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] Furthermore, in the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "fixed" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical connections; direct connections or indirect connections via an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] like Figure 1 As shown, a preferred embodiment of the present invention provides a refrigerator refrigeration and defrost control system, which includes a double-suction compressor 1, a condenser 2, a drying filter 3, a refrigeration throttling device 4, a refrigeration evaporator 5, a freezing throttling device 6, a freezing evaporator 7, a three-way valve 8 and several solenoid valves.

[0027] The exhaust port a of the double-suction compressor 1 is connected in parallel with three branches, namely the first branch, the second branch and the third branch.

[0028] The first branch is connected in series with a condenser 2 and a drying filter 3. The end of the first branch is divided into two paths. One path is connected in sequence to the first solenoid valve 9, the refrigeration throttling device 4 and the input end of the refrigeration evaporator 5, and the other path is connected in sequence to the second solenoid valve 10, the freezing throttling device 6 and the input end of the freezing evaporator 7.

[0029] The second branch is connected to a third solenoid valve 11 , and an end of the second branch is connected to an input end of the refrigeration evaporator 5 .

[0030] The third branch is connected to a fourth solenoid valve 12 , and the end of the third branch is connected to the first interface d of the tee 8 .

[0031] The output end of the refrigeration evaporator 5 is connected to the second interface e of the tee 8 .

[0032] The third interface f of the three-way valve 8 is divided into two paths, one path is connected to the fifth solenoid valve 13 and the first suction port b of the double-suction compressor 1 in sequence, and the other path is connected to the sixth solenoid valve 14 and the input end of the refrigeration evaporator 7 in sequence.

[0033] The output end of the refrigeration evaporator 7 is connected to the second suction port c of the double suction compressor 1 .

[0034] The first solenoid valve 9, the second solenoid valve 10, the third solenoid valve 11, the fourth solenoid valve 12, the fifth solenoid valve 13 and the sixth solenoid valve 14 are all electrically connected to the control board of the refrigerator, and the control board can control the opening and closing of the above solenoid valves.

[0035] The system is equipped with refrigeration mode, freezing refrigeration mode, forced refrigeration mode, refrigeration defrost mode and freezing defrost mode. The refrigerator automatically selects the above control mode according to the operating conditions of the refrigerator and the surrounding environment.

[0036] In refrigeration mode, the control panel opens the first and fifth solenoid valves 9 and 13, and closes the second, third, fourth, and sixth solenoid valves 10, 11, 12, and 14. Refrigerant is discharged from the exhaust port a of the double-suction compressor 1. This refrigerant then passes through the condenser 2, where it is condensed and dissipated, then throttled and depressurized by the refrigeration throttling device 4. It then evaporates in the refrigeration evaporator 5, generating cold air to cool the refrigerator compartment. Finally, it returns to the first intake port b of the double-suction compressor 1, continuing the cycle.

[0037] In the freezing and cooling mode, the control panel controls the second solenoid valve 10 to open, while the first, third, fourth, fifth, and sixth solenoid valves 14 are all closed. Refrigerant is discharged from the exhaust port a of the double-suction compressor 1. The refrigerant is then condensed and dissipated by the condenser 2, throttled and depressurized by the freezing throttling device 6, evaporated by the freezing evaporator 7, and cooled to generate cold air for cooling the refrigerator's freezer compartment. Finally, the refrigerant returns to the second suction port c of the double-suction compressor 1, continuing the cycle.

[0038] In forced cooling mode, the control panel controls the first, second, and fifth solenoid valves 9, 10, and 13 to open, and the third, fourth, and sixth solenoid valves 11, 12, and 14 to close. The refrigerant is discharged from the exhaust port a of the double-suction compressor 1. After condensation and heat dissipation in the condenser 2, the refrigerant is divided into two paths. One path is first throttled and depressurized by the refrigeration throttling device 4, then enters the refrigeration evaporator 5 to evaporate and generate cold energy to cool the refrigerator's refrigerator compartment, and finally returns to the first intake port b of the double-suction compressor 1. Meanwhile, the other path is first throttled and depressurized by the freezing throttling device 6, then enters the freezing evaporator 7 to evaporate and generate cold energy to cool the refrigerator's freezer compartment, and finally returns to the second intake port c of the double-suction compressor 1, and the cycle continues.

[0039] In refrigeration defrost mode, the control panel opens third and fifth solenoid valves 11 and 13, while closing first, second, fourth, and sixth solenoid valves 9, 10, 12, and 14. High-temperature, high-pressure refrigerant is discharged from exhaust port a of double-suction compressor 1. This high-temperature, high-pressure refrigerant first enters the refrigeration evaporator 5, raising its surface temperature and defrosting the evaporator. It then returns to first intake port b of double-suction compressor 1, continuing the cycle.

[0040] In the freezing and defrosting mode, the double-suction compressor 1 is first shut down for T1. In the present invention, T1 is preferably 5-10 minutes. During the shutdown period of the double-suction compressor 1, the control board controls the sixth solenoid valve 14 to open, and the first solenoid valve 9, the second solenoid valve 10, the third solenoid valve 11, the fourth solenoid valve 12 and the fifth solenoid valve 13 are all closed.

[0041] Because the temperature inside the refrigerated evaporator 5 is relatively high, approximately -5°C, and the temperature inside the frozen evaporator 7 is relatively low, approximately -25°C, the pressure inside the refrigerated evaporator 5 is higher than the pressure inside the frozen evaporator 7. The refrigerant in the refrigerated evaporator 5 and the refrigerant in the frozen evaporator 7 are neutralized by the pressure difference, that is, the refrigerant in the refrigerated evaporator 5 enters the frozen evaporator 7. This neutralization has the following effects: first, more refrigerant enters the frozen evaporator 7, improving defrosting efficiency; second, it increases the initial surface temperature of the frozen evaporator 7, shortening the defrosting time.

[0042] After T1 time, the double-suction compressor 1 is turned on. At the same time, the fourth solenoid valve 12 is opened, and the exhaust port a of the double-suction compressor 1 discharges the high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant first enters the refrigeration evaporator 7, thereby increasing the surface temperature of the refrigeration evaporator 7 to achieve the purpose of defrosting, and then returns to the second suction port c of the double-suction compressor 1 and circulates.

[0043] To sum up, the refrigerator refrigeration and defrost control system described in the embodiment of the present invention has five control modes. In particular, in the freezing and defrosting mode, the refrigerant in the refrigeration evaporator 5 and the refrigerant in the freezing evaporator 7 are first neutralized under the action of the pressure difference, and then the evaporator is defrosted by using the high-temperature and high-pressure refrigerant freezing, which improves the defrosting efficiency and shortens the defrosting time. Compared with electric heating defrosting, it reduces the defrosting energy consumption and improves the storage quality of food.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A refrigerator refrigeration and defrosting control system, characterized in that: The system includes a double-suction compressor, the exhaust port of which is connected in parallel with three branches; The first branch is connected to a condenser, and the end of the first branch is divided into two paths, one path is connected in sequence to the first solenoid valve, the refrigeration throttling device and the input end of the refrigeration evaporator, and the other path is connected in sequence to the second solenoid valve, the freezing throttling device and the input end of the freezing evaporator; The second branch is connected to a third solenoid valve, and the end of the second branch is connected to the input end of the refrigeration evaporator; The third branch is connected to a fourth solenoid valve, and the end of the third branch is connected to the first interface of the tee; The output end of the refrigeration evaporator is connected to the second interface of the tee; The third interface of the three-way valve is divided into two paths, one path is connected to the fifth solenoid valve and the first suction port of the double-suction compressor in sequence, and the other path is connected to the sixth solenoid valve and the input end of the refrigeration evaporator in sequence; The output end of the refrigeration evaporator is connected to the second suction port of the double-suction compressor.

2. A refrigerator refrigeration and defrosting control system according to claim 1, characterized in that: The system is equipped with a refrigeration mode, a freezing refrigeration mode, a forced refrigeration mode, a refrigeration defrost mode and a freezing defrost mode.

3. A refrigerator refrigeration and defrosting control system according to claim 2, characterized in that: In the refrigeration mode, the first solenoid valve and the fifth solenoid valve are both opened, and the second solenoid valve, the third solenoid valve, the fourth solenoid valve and the sixth solenoid valve are all closed. The refrigerant is discharged from the exhaust port of the double-suction compressor, condensed by the condenser, throttled by the refrigeration throttling device, evaporated by the refrigeration evaporator to generate cold air, and finally returned to the first suction port of the double-suction compressor.

4. A refrigerator refrigeration and defrosting control system according to claim 2, characterized in that: In the freezing and refrigeration mode, the second solenoid valve is opened, and the first solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve and the sixth solenoid valve are all closed. The refrigerant is discharged from the exhaust port of the double-suction compressor, condensed by the condenser, throttled by the freezing throttling device, evaporated by the freezing evaporator and generates cold air, and finally returns to the second suction port of the double-suction compressor.

5. A refrigerator refrigeration and defrosting control system according to claim 2, characterized in that: In the forced cooling mode, the first solenoid valve, the second solenoid valve and the fifth solenoid valve are all opened, and the third solenoid valve, the fourth solenoid valve and the sixth solenoid valve are all closed. The refrigerant is discharged from the exhaust port of the double-suction compressor, and is divided into two paths after condensation by the condenser. One path is first throttled by the refrigeration throttling device, and then enters the refrigeration evaporator to evaporate and generate cold energy, and finally returns to the first suction port of the double-suction compressor. At the same time, the other path is first throttled by the freezing throttling device, and then enters the freezing evaporator to evaporate and generate cold energy, and finally returns to the second suction port of the double-suction compressor.

6. A refrigerator refrigeration and defrosting control system according to claim 2, characterized in that: In the refrigeration defrost mode, the third solenoid valve and the fifth solenoid valve are both opened, and the first solenoid valve, the second solenoid valve, the fourth solenoid valve and the sixth solenoid valve are all closed. The exhaust port of the double-suction compressor discharges high-temperature refrigerant, and the high-temperature refrigerant first enters the refrigeration evaporator and then returns to the first suction port of the double-suction compressor.

7. A refrigerator refrigeration and defrosting control system according to claim 2, characterized in that: In the freezing and defrosting mode, the double-suction compressor is first shut down for T1, and T1 is 5-10 minutes. During the shutdown period of the double-suction compressor, the sixth solenoid valve is opened, and the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve are all closed. The refrigerant in the refrigeration evaporator and the refrigerant in the freezing evaporator are neutralized under the action of the pressure difference, and then the double-suction compressor is started. At the same time, the fourth solenoid valve is opened, and the exhaust port of the double-suction compressor discharges the high-temperature refrigerant. The high-temperature refrigerant first enters the freezing evaporator and then returns to the second suction port of the double-suction compressor.

8. A refrigerator refrigeration and defrosting control system according to claim 1, characterized in that: The first branch is connected to a drying filter in series with the condenser.

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