CN106766525B - Wind cooling refrigerator and its defrosting control method - Google Patents

Abstract

The invention discloses an air-cooled refrigerator and a defrosting control method thereof. The refrigerator includes a refrigeration system, including a freezing evaporator and a refrigeration evaporator with controllable access to the passage; a freezing evaporator chamber and a refrigeration evaporator chamber; a freezing chamber and a refrigerator chamber; Circulating air is formed between the refrigerating chamber and the refrigerating chamber; the freezing air supply system is used to form circulating air between the refrigerating evaporator chamber and the freezing chamber; two heating units are respectively arranged in the refrigerating evaporator chamber and the refrigerating evaporator chamber; and Control System. The defrosting control method includes steps: when the starting defrosting condition is met, control the refrigeration system to shut down, the refrigeration and freezing air supply system to shut down, and the heating unit to turn on; after the defrosting stop condition is met, control the heating unit to shut down, and the freezing evaporator to work 1. The refrigerating and freezing air supply systems are turned off, and continue until the first preset condition is met; the refrigeration system is controlled to be turned on, at least one of the refrigerating and freezing air supply systems is turned on, and the heating unit is turned off.

Description

Air-cooled refrigerator and its defrosting control method

technical field

The invention relates to an air-cooled refrigerator and a defrosting control method thereof, belonging to the technical field of household appliances.

Background technique

Frost-free refrigerators, also known as intercooled refrigerators or air-cooled refrigerators, use fans to force the cold air to circulate through forced convection to refrigerate and freeze food. In the prior art, the frost-free refrigerator has the advantage of fast cooling rate, but the non-stop blowing during operation will speed up the evaporation of moisture in the food, and the evaporated moisture will be taken away by the cold wind and freeze on the surface of the evaporator when it passes through the evaporator The formation of a frost layer affects the heat exchange efficiency of the evaporator, so it is necessary to defrost the evaporator regularly.

In the current frost-free refrigerator, the high-temperature gas generated during the defrosting process of the evaporator will cause the temperature of the freezer to rise, increase the temperature fluctuation of the freezer, and then affect the quality of food storage. Therefore, for air-cooled refrigerators, there is a need to minimize freezer temperature fluctuations during a defrost cycle.

Contents of the invention

The purpose of the present invention is to provide an air-cooled refrigerator and its defrosting control method, especially a dual-system air-cooled refrigerator, which can not only realize effective defrosting, but also solve the temperature fluctuation of the freezing chamber caused by the defrosting process in the prior art The problem.

To achieve one of the above objects, an embodiment of the present invention provides an air-cooled refrigerator, which includes:

a refrigeration system forming a pathway for refrigerant flow, including a refrigeration evaporator and a refrigeration evaporator controllably connected to said pathway;

The box body defines an evaporator room, a freezer room and a refrigerator room for storing items, the evaporator room includes a freezing evaporator room provided with the freezing evaporator and a refrigeration evaporator room provided with the refrigeration evaporator organ room;

A refrigerating air supply system, which is controllably opened and closed and used to form circulating air between the refrigerating evaporator chamber and the refrigerating chamber when opened;

a freezing air supply system, controllably openable and closed, and used to form circulating air between the freezing evaporator chamber and the freezing chamber when turned on;

Two heating units are respectively arranged in the refrigerating evaporator chamber and the refrigerating evaporator chamber, and generate heat when turned on;

The control system is used for: when the start-up defrosting condition is satisfied, control the refrigeration system to be closed, the refrigeration air supply system to be closed, the freezing air supply system to be closed, and the two heating units to be opened, so as to control the The refrigerating evaporator and the refrigerating evaporator are defrosted; until the defrosting stop condition is satisfied, the two heating units are controlled to be closed, the refrigeration system is opened, and the refrigerant flows through the refrigerating evaporator. The refrigerating air supply system is closed, the refrigerating air supply system is closed, and continue until the first preset condition is met; the refrigeration system is turned on, and at least one of the refrigerating air supply system and the refrigerating air supply system is turned on , two of the heating units are turned off, so that the refrigerator enters a cooling mode.

As a further improvement of an embodiment of the present invention, the control system is further used to control the refrigeration system to be closed, the refrigeration air supply system to be opened, and the refrigeration air supply system to be opened when the defrosting start condition is met. , two of the heating units are turned off, and after a first preset period of time, control the shutdown of the refrigeration system, the shutdown of the refrigeration air supply system, the shutdown of the freezing air supply system, and the shutdown of the two heating units open.

As a further improvement of an embodiment of the present invention, the control system is also used to: control the shutdown of the two heating units, the shutdown of the refrigeration system, and the shutdown of the refrigeration air supply system after the defrosting stop condition is satisfied. off, the freezing air supply system is turned off, and after a second preset period of time, the two heating units are controlled to be turned off, the refrigeration system is turned on, and the refrigerant flows through the freezing evaporator, the refrigerating The air supply system is turned off, the refrigerated air supply system is turned off, and this continues until the first preset condition is met.

As a further improvement of an embodiment of the present invention, the first preset condition is set to be that the temperature Td of the refrigerated evaporator is less than or equal to the defrosting and deheating preset temperature, or the first preset condition is set to the The temperature Td is lower than the temperature Tf of the freezing chamber by a preset temperature difference value, or the first preset condition is set to pass a third preset time period.

As a further improvement of an embodiment of the present invention, when the refrigerator enters the refrigeration mode, the control system is further used to: control the refrigeration system to be turned on and make the refrigerant flow through the freezing evaporator, the refrigeration The air supply system is turned off, the freezing air supply system is turned on, and the two heating units are turned off; when the fourth preset time period is reached or when the fourth preset time period is not reached, the temperature of the freezing chamber When Tf drops to the freezing preset temperature, the refrigeration system is controlled to open and the refrigerant flows through the freezing evaporator and the refrigeration evaporator, the refrigeration air supply system is opened, the refrigeration air supply system is opened, and both Each of the heating units is turned off; until the temperature Tr of the refrigerating chamber drops to the preset temperature of refrigerating shutdown and the temperature Tf drops to the preset temperature of refrigerating shutdown, the cooling mode ends;

Wherein, the freezing preset temperature is not less than the freezing shutdown preset temperature.

In order to achieve one of the above objectives, an embodiment of the present invention also provides a defrosting control method for an air-cooled refrigerator, the method comprising the steps of:

When the start-up defrosting conditions are met, control the refrigeration system to shut down, the refrigeration air supply system to close, the freezing air supply system to close, and the two heating units to open, so as to defrost the refrigeration evaporator and the freezing evaporator respectively;

After the defrosting stop condition is met, the two heating units are controlled to be turned off, the refrigeration system is turned on and the refrigerant flows through the refrigerated evaporator, the refrigerated air supply system is closed, and the refrigerated air supply system is closed, and continue until the first preset condition is met ;

The refrigeration system is controlled to be turned on, at least one of the refrigerating air supply system and the freezing air supply system is turned on, and the two heating units are turned off, so that the refrigerator enters the cooling mode.

As a further improvement of an embodiment of the present invention, the step "when the starting defrosting condition is satisfied, control the refrigeration system to close, the refrigeration air supply system to close, the freezing air supply system to close, and the two heating units to open, so as to Evaporators and refrigerated evaporators for defrosting" include:

When the start-up defrosting conditions are met, the control refrigeration system is turned off, the refrigerating air supply system is turned on, the freezing air supply system is turned on, and the two heating units are turned off, and last for a first preset time period;

Control the shutdown of the refrigeration system, the shutdown of the refrigeration air supply system, the shutdown of the refrigeration air supply system, and the opening of the two heating units, so as to defrost the refrigeration evaporator and the freezing evaporator respectively.

As a further improvement of an embodiment of the present invention, the step "after the defrosting stop condition is met, control the two heating units to be closed, the refrigeration system to be opened and the refrigerant to flow through the refrigerated evaporator, the refrigerated air supply system to be closed, and the refrigerated The air supply system is turned off and continues until the first preset condition is met" includes:

After the defrosting stop condition is met, control the shutdown of the two heating units, the shutdown of the refrigeration system, the shutdown of the refrigerating air supply system, and the shutdown of the freezing air supply system, and last for a second preset time period;

The two heating units are controlled to be turned off, the refrigeration system is turned on and the refrigerant flows through the refrigerated evaporator, the refrigerated air supply system is turned off, the refrigerated air supply system is turned off, and continue until the first preset condition is met.

As a further improvement of an embodiment of the present invention, the first preset condition is set to be that the temperature Td of the refrigerated evaporator is less than or equal to the defrosting and deheating preset temperature, or the first preset condition is set to the The temperature Td is lower than the temperature Tf of the freezing chamber by a preset temperature difference value, or the first preset condition is set to pass a third preset time period.

As a further improvement of an embodiment of the present invention, the cooling mode includes the steps of:

Control the refrigeration system to turn on and let the refrigerant flow through the refrigerating evaporator, the refrigerating air supply system is closed, the refrigerating air supply system is turned on, and the two heating units are turned off to provide cooling for the freezer;

When the fourth preset time period is reached or when the temperature Tf of the freezing chamber reaches the freezing preset temperature before the fourth preset time period is reached, the refrigeration system is controlled to be turned on and the refrigerant flows through the freezing evaporator and the refrigerating and evaporating The refrigerator, the refrigerated air supply system is turned on, the refrigerated air supply system is turned on, and the two heating units are turned off, so as to supply cooling to the freezer and refrigerator at the same time;

After the temperature Tr of the refrigerating chamber drops to the preset temperature of refrigerating shutdown and the temperature Tf of the freezing chamber reaches the preset temperature of freezing shutdown, the refrigeration mode ends;

Wherein, the freezing preset temperature is not less than the freezing shutdown preset temperature.

Compared with the prior art, the beneficial effect of the present invention is that: not only energy-saving defrosting of the evaporator can be realized, but also the influence on the temperature of the freezing chamber and the refrigerating chamber can be reduced during the defrosting process, achieving The effect that the temperature fluctuation of the refrigerator room is small.

Description of drawings

Fig. 1 is a schematic structural view of a refrigerator according to an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of a refrigeration system according to an embodiment of the present invention;

Fig. 3 is a block diagram of a control system according to an embodiment of the present invention;

Fig. 4 is a logic flow chart of a defrosting control method for a refrigerator according to an embodiment of the present invention;

Fig. 5 is a logic flow chart of the cooling mode in the defrosting control method according to an embodiment of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present invention.

1 to 3, an embodiment of the present invention provides a refrigerator 100, the refrigerator 100 is specifically a dual-system air-cooled refrigerator, which includes a box body 10, a storage compartment for storing items, and a refrigeration system 30 , evaporator room, air supply system, control system 60 and heating unit 70.

The storage compartment is defined by the box body 10 and includes a freezer compartment 21 and a refrigerator compartment 22 . The storage temperature of the freezer compartment 21 is set to a freezing temperature zone (such as -18°C to -16°C) for frozen storage of food; the storage temperature of the freezer compartment 22 is set to a refrigeration temperature zone (such as 5°C to 8°C ) for refrigerated storage of food. Of course, the refrigerator 100 may also include other storage compartments besides the freezing compartment 21 and the refrigerating compartment 22 .

The refrigerating system 30 forms a passage for the refrigerant to flow, and the refrigerating system 30 is at least used to provide cooling capacity for the freezing chamber 21 and the refrigerating chamber 22 . Specifically, the refrigeration system 30 includes a refrigeration evaporator 331 and a refrigeration evaporator 332 that are controllably connected to the passage. Wherein, when the refrigerating evaporator 331 is connected to the passage, that is, when the refrigerant can flow through the refrigerating evaporator 331, the refrigerating evaporator 331 can cool the surrounding air; correspondingly, when the refrigerating evaporator 332 is connected When entering the passage, that is, when the refrigerant can flow through the refrigerating evaporator 332, the refrigerating evaporator 332 can cool the air around it. Of course, the connection of the freezing evaporator 331 to the passage and the connection of the refrigeration evaporator 332 to the passage are not mutually exclusive, and can be selectively set to exist independently or together according to the specific structure of the refrigeration system 30 .

Referring to FIG. 2 , in this embodiment, the refrigeration system 30 is specifically configured as a series-parallel structure, including a compressor 31 , a condenser 32 , an anti-condensation pipe 34 , a drying filter 35 , and a refrigeration evaporator 331 . In addition, the refrigeration system 30 also includes a three-way valve 36 , and a freezing branch circuit and a refrigeration branch circuit arranged in parallel between the outlet of the drying filter 35 and the inlet of the freezing evaporator 331 through the three-way valve 36 . The freezing branch includes a freezing capillary 371 matching the freezing evaporator 331. When the three-way valve 36 is connected to the freezing branch, the refrigerant can only flow through the freezing evaporation in the freezing evaporator 331 and the refrigeration evaporator 332. 331, that is, at this time, the refrigeration system 30 operates in a similar single-system mode; the refrigeration branch includes a refrigeration capillary 372 and a refrigeration evaporator 332, and when the three-way valve 36 is connected to the refrigeration branch, the refrigerants are It flows through the refrigerating evaporator 332 and the freezing evaporator 331 in sequence, that is, at this time, the refrigeration system 30 operates in a similar dual-system mode in series.

The evaporator chamber is defined by the box body 10 and includes a freezing evaporator chamber 41 and a refrigerating evaporator chamber 42 which are independent of each other. Wherein, a freezing evaporator 331 is provided inside the freezing evaporator chamber 41, and when the refrigeration system 30 is turned on and the freezing evaporator 331 is connected to the passage, the freezing evaporator 331 can cool the air in the freezing evaporator chamber 41 to form Low-temperature cold air; correspondingly, a refrigeration evaporator 332 is provided inside the refrigeration evaporator chamber 42. When the refrigeration system 30 is turned on and the refrigeration evaporator 332 is connected to the passage, the refrigeration evaporator 332 can make the air in the refrigeration evaporator chamber 42 is cooled to form low-temperature cold air.

The air supply system is used to form an air circulation channel between the storage compartment and the evaporator chamber and realize the circulation of air flow. Specifically, the air supply system includes a freezing air supply system and a refrigerating air supply system.

Wherein, the freezing air supply system is controllably opened and closed, and is used to form circulating air between the freezing evaporator chamber 41 and the freezing chamber 21 when turned on. When the refrigeration system 30 is turned on and the freezing evaporator 331 is connected to the passage, the freezing air supply system is turned on, so that the cold air formed in the freezing evaporator chamber 41 can enter the freezing chamber 21 to supply cooling to the freezing chamber 21, thereby The temperature of the freezer compartment 21 is regulated. Specifically, in this embodiment, the refrigeration air supply system includes a refrigeration duct 511 , a refrigeration fan 521 and a refrigeration damper 531 . The freezing air duct 511 is used to communicate with the freezing evaporator chamber 41 and the freezing chamber 21, and form a passage for cold air to circulate between the freezing evaporator chamber 41 and the freezing chamber 21; the freezing fan 521 is arranged in the freezing evaporator chamber 41, And it is used to promote the flow of air to form an air flow; the freezing air door 531 is arranged at the freezing air duct 511 and is used to open and close the freezing air duct 511 . When the freezing blower 521 is turned on and the freezing damper 531 is turned on, the freezing air supply system is turned on.

Further, in this embodiment, a fan shield (not shown) is provided at the refrigeration fan 521, and the fan shield has an opening corresponding to the refrigeration air duct 511, and the refrigeration damper 531 is disposed at the opening, so as to Keep or block the refrigeration fan 521 from blowing air into the refrigeration air passage 511 . In this way, the unintentional influence of the temperature of the freezing compartment 21 by the temperature change in the freezing evaporator compartment 41 can be reduced.

The refrigerating air supply system is controllably opened and closed, and is used to form circulating air between the refrigerating evaporator chamber 42 and the refrigerating chamber 22 when turned on. When the refrigerating system 30 is turned on and the refrigerating evaporator 332 is connected to the passage, the refrigerating air supply system is turned on, so that the cold air formed in the refrigerating evaporator chamber 42 enters the refrigerating chamber 22 to provide cooling for the refrigerating chamber 22, thereby The temperature of the refrigerator compartment 22 is regulated. Specifically, in this embodiment, the refrigerating air supply system includes a refrigerating air duct 512 , a refrigerating fan 522 and a refrigerating damper 532 . The refrigerating air channel 512 is used to connect the refrigerating evaporator chamber 42 and the refrigerating chamber 22, and form a passage for cold air to circulate between the refrigerating evaporator chamber 42 and the refrigerating chamber 22; the refrigerating fan 522 is arranged in the refrigerating evaporator chamber 42, And it is used to promote the flow of air to form an air flow; the refrigerating damper 532 is arranged at the refrigerating air duct 512 and is used for opening and closing the refrigerating air duct 512 . When the refrigeration fan 522 is turned on and the refrigeration damper 532 is opened, the refrigeration air supply system is turned on.

There are two heating units 70, corresponding to the refrigeration evaporator 331 and the refrigeration evaporator 332, respectively. Specifically, one of the heating units 70 is arranged in the refrigerating evaporator chamber 41, which can generate heat to melt the frost on the refrigerating evaporator 331 when it is turned on; the other heating unit 70 is arranged in the refrigerating evaporator chamber 42 , which can generate heat to melt the frost on the refrigerated evaporator 332 when it is turned on. The two heating units 70 can be set to work at different powers. Preferably, the heating unit 70 disposed in the refrigerating evaporator 41 has a relatively higher working power to meet the requirement of greater defrosting intensity of the refrigerating evaporator 41 . In one embodiment, the heating unit 70 can be specifically configured as an electric heating wire, which can be turned on and generate heat when electrified.

The control system 60 is respectively connected with the refrigeration system 30, the air supply system, and the two heating units 70, and is used to control the opening and closing of the refrigeration system 30, the air supply system, and the two heating units 70, so as to realize the Control of the operating state of the refrigerator 100 .

Specifically, the control system 60 can control the opening and closing of the refrigeration system 30 and control the three-way valve 36 to selectively connect the freezing branch and the refrigeration branch, so that the refrigeration system 30 is in different working states, such as the above-mentioned Single system mode, serial dual system mode, shutdown status, etc.

The control system 60 can also control the opening and closing of the air supply system, including controlling the opening and closing of the refrigeration air supply system and the refrigeration air supply system. For example, in this embodiment, the control system 60 can control the opening of the refrigeration fan 521 and the opening of the refrigeration damper 531, so that the refrigeration air supply system is opened, thereby realizing the formation of circulating airflow in the refrigeration evaporator chamber 41 and the refrigeration chamber 21; Alternatively, the control system 60 may also control the freezing fan 521 to be closed and the freezing damper 531 to be closed, so as to close the freezing air supply system, so that the freezing evaporator chamber 41 and the freezing chamber 21 are relatively independent and closed.

The control system 60 can also control the opening and closing of the two heating units 70 , specifically, the control system 60 can control the two heating units 70 to be connected to or cut off from the power supply, so as to control whether the heating units 70 work or not.

Further, referring to FIG. 3 , the control system 60 includes a setting module 61 , a temperature collection module 62 , a timing module 63 , a judging module 64 and a control module 65 .

Wherein, the setting module 61 is used to obtain various standard parameters for the operation of the refrigerator 100, and the standard parameters include but not limited to temperature parameters, time parameters, power parameters, speed parameters and the like. In this embodiment, the standard parameters used by the setting module 61 to obtain at least include: the preset freezing start temperature Tfon for the freezer compartment 21, the preset freezing shutdown temperature Tfoff; and the preset refrigeration start temperature for the refrigerator compartment 22 Tron, refrigerated shutdown preset temperature Troff. Wherein, the freezing power-on preset temperature Tfon defines the threshold for cooling the freezing chamber 21 to lower the temperature, and the freezing shutdown preset temperature Tfoff defines the threshold for ending the cooling for the freezing chamber 21. The start-up preset temperature Tron defines the threshold for cooling the refrigerating chamber 22 to lower the temperature, and the refrigerating shutdown preset temperature Troff defines the threshold for ending the cooling for the refrigerating chamber 22 .

The temperature acquisition module 62 includes a freezing sensor 621 arranged in the freezing chamber 21, a refrigeration sensor 622 arranged in the refrigerator chamber 22, a freezing and defrosting sensor 623 arranged at the freezing evaporator 331, and a Refrigerated defrost sensor 624. Wherein, freezing evaporator 621 is used for collecting the temperature Tf of freezing room 21 in real time, so that the temperature of freezing room 21 is regulated; For regulation; the freezing and defrosting sensor 623 is used to collect the temperature Td of the freezing evaporator 321 ; the refrigeration and defrosting sensor 624 is used to collect the temperature Td′ of the refrigeration evaporator 322 .

The timing module 63 is used for recording time, specifically, it can be set as a timer.

The judgment module 64 is used to receive the temperature information collected by the temperature acquisition module 62 and the time information recorded by the timing module 63, and compare the temperature information and the time information with corresponding standard parameters to generate critical result.

The control module 65 is connected to the setting module 61, the temperature collection module 62, the timing module 63, and the judgment module 64, and performs information interaction with the setting module 61, the temperature collection module 62, the timing module 63, and the judgment module 64, and controls the refrigeration system 30 , the opening and closing of the air supply system and the two heating units 70 .

Referring to FIG. 4 to FIG. 5 , they illustrate a defrosting control method of an embodiment, that is, a defrosting process. The defrosting control method of an embodiment will be described below in conjunction with the specific structure of the refrigerator 100 of this embodiment. The defrosting control method includes:

Steps: when the starting defrosting conditions are met, control the refrigeration system to close, the refrigeration air supply system to close, the freezing air supply system to close, and the two heating units to open, so as to defrost the refrigeration evaporator and the freezing evaporator respectively;

Specifically, the start defrosting condition is set as an initial condition for the refrigerator 100 to switch from a normal cooling process to a defrosting process, which has many different implementations.

For example, in one embodiment, the timing module 63 counts the accumulated time t5 of the refrigeration system 30 being turned on and running since the end of the last defrosting process, and the start-up defrosting condition is set such that the accumulated time t5 reaches the fifth preset time period T5; wherein, the fifth preset time period T5 is pre-acquired by the setting module 61; the judging module 64 compares the accumulated time t5 with the size of the fifth preset time period T5, if t5≥T5( Step S101-Y), the defrosting start condition is satisfied, and if t5<T5 (step S101-N), the defrosting start condition is not satisfied.

For another example, in one embodiment, the defrosting start condition is set such that the temperature Td is less than or equal to the defrosting start preset temperature Tdon; wherein, the defrosting start preset temperature Tdon is pre-acquired by the setting module 61 and Tdon The possible value is -22°C; the judging module 64 compares the temperature Td with the preset defrosting temperature Tdon, if Td≤Tdon (step S101-Y), the defrosting condition is satisfied, And if Td>Tdon (step S101-N), then the defrosting start condition is not satisfied.

When the defrosting start condition is satisfied (step S101-Y), the control system 60 controls the refrigerator 100 to start defrosting, and the refrigerator 100 may enter a "defrosting state" (step S104). In this embodiment, when the refrigerator 100 is in the defrosting state, the control system 60 controls the refrigeration system 30 to be turned off, the refrigerating air supply system to be turned off, the freezing air supply system to be turned off, and the two heating units 70 to be turned on. In this way, by closing the refrigerating air supply system and the refrigerating air supply system, the refrigerating evaporator chamber 41 and the refrigerating evaporator chamber 42 respectively form closed spaces, and the heat generated by defrosting will not enter the refrigerating chamber 22 and the freezing chamber. 21. It will not have too much impact on the two, especially the freezing chamber 21, so as to avoid temperature fluctuations in the freezing chamber 21.

Steps: After the defrosting stop condition is met, control the two heating units to turn off, turn on the refrigeration system and let the refrigerant flow through the refrigerating evaporator, turn off the refrigerating air supply system, and turn off the refrigerating air supply system, and continue until the first preset conditions are met;

Specifically, in this embodiment, the condition for stopping defrosting is set such that the temperature Td is greater than the preset defrosting end temperature Tdoff (step S105); wherein, the defrosting end preset temperature Tdoff is preset by the setting module 61 Acquire and Tdoff can take a value of 8°C; the judging module 64 compares the temperature Td with the defrosting end preset temperature Tdoff: if Td≤Tdoff (step S105-N), the defrosting stop condition If not, proceed to step S104; and if Td>Tdoff (step S105-Y), then the defrosting stop condition is satisfied.

When the defrosting stop condition is satisfied (step S105-Y), the control system 60 controls the refrigerator 100 to start removing the heat generated by defrosting, and the refrigerator 100 can enter a "heat removal state" (step S108). In this embodiment, when the refrigerator 100 is in the heat removal state, the control system 60 controls the refrigeration system 30 to open and controls the three-way valve 36 to connect the freezing branch so that the refrigerant only flows through the two evaporators 331 , the refrigerating evaporator 331 in 332, the refrigerating air supply system is closed, the refrigerating air supply system is closed, and the two heating units 70 are closed. In this way, when the refrigerator is in the heat removal state, through the operation of the refrigeration system, the temperature of the refrigerating evaporator is gradually reduced, and the high-temperature gas in the refrigerating evaporator chamber is cooled, thereby avoiding the temperature fluctuation of the freezing chamber caused by the high-temperature gas entering the freezing chamber; , only the freezing branch is connected, which can avoid unnecessary high energy consumption caused by the refrigeration branch being connected at the same time.

Of course, in other embodiments, the condition for stopping defrosting may include that the temperature Td' is greater than the preset defrosting end temperature in addition to the temperature Td being greater than the defrosting end preset temperature Tdoff Tdoff, that is, the defrosting stop condition is Td>Tdoff, Td'>Tdoff, so as to realize the control of closing the two heating units 70 . For example, in one example, when any one of Td>Tdoff and Td'>Tdoff is not established, the control system 60 controls both heating units 70 to work until Td>Tdoff and Td'>Tdoff are established, and then controls The two heating units 70 are turned off at the same time, that is, the heating and defrosting of the freezing evaporator 331 and the refrigerating evaporator 332 are completed at the same time; in another example, when Td>Tdoff is established, the control system 60 controls the corresponding freezing evaporator The heating unit 70 of 331 is turned off separately. When Td'>Tdoff is established, the control system 60 controls the heating unit 70 corresponding to the refrigerating evaporator 332 to be turned off separately. The situation is controlled individually, eventually reaching the state of "both heating units 70 off".

Further, referring to FIG. 4 , in this embodiment, the heat removal state continues until the first preset condition is met. Wherein, the first preset condition has many different implementation manners.

For example, in one embodiment, the first preset condition is set such that the temperature Td is less than or equal to the preset defrosting and deheating temperature Tdset; wherein, the defrosting and deheating preset temperature Tdset is pre-acquired by the setting module 61 ; The judging module 64 compares the temperature Td with the defrosting and defrosting preset temperature Tdset: if Td≤Tdset (step S109-Y), the first preset condition is satisfied; and if Td> Tdset (step S109-N), the first preset condition is not satisfied. Wherein, the defrosting and deheating preset temperature Tdset is set to be no greater than the freezing start-up preset temperature Tfon, which can ensure that the temperature Td of the refrigerating evaporator 331 is low enough before the refrigerator 100 enters the subsequent "cooling mode", avoiding The high heat environment raises the temperature of the freezing chamber 21 .

For another example, in one embodiment, the first preset condition is set such that the temperature Td is lower than the temperature Tf by a preset temperature difference value ΔT; wherein, the preset temperature difference value ΔT is preset by the setting module 61 Acquire and ΔT can take a value within the range of 2~3°C; the judging module 64 compares the temperature Td with the temperature Tf-ΔT: if Td≤Tf-ΔT (step S109-Y), then the The first preset condition is satisfied, and if Td>Tf-ΔT (step S109-N), the first preset condition is not satisfied. In this way, by reducing the temperature Td of the freezing evaporator 331 to be lower than the temperature Tf of the freezing chamber 21, the temperature stability of the freezing chamber 21 can be effectively ensured.

For another example, in an implementation manner, after the refrigerator 100 enters the heat removal state, the timing module 63 counts the duration t3 of the heat removal state, and the first preset condition is set to be that the time t3 reaches the third preset Time period T3; wherein, the third preset time period T3 is obtained in advance by the setting module 61 and T3 can take a value within the range of 3 to 5 minutes; the judgment module 64 compares the time t3 and the third preset time The size of segment T3 is compared: if t3≥T3 (step S109-Y), the first preset condition is satisfied, and if t3<T3 (step S109-N), the first preset condition is not satisfied .

Steps: controlling the refrigeration system to be turned on, at least one of the refrigeration air supply system and the freezing air supply system to be turned on, and the two heating units to be turned off, so that the refrigerator enters the refrigeration mode.

Specifically, the control module 65 controls the refrigerator 100 to enter the “cooling mode” (step S110 ), so as to lower the temperature of the refrigerating chamber 22 and the freezing chamber 21 whose temperature has risen due to defrosting in time.

When the cooling mode is completed, the refrigerator 100 is controlled to enter the "shutdown state" (step S111 ), and then the defrosting process of this time is completed. Specifically, when the refrigerator 100 is in the shutdown state, the control system 60 controls the refrigeration system 30 to be closed, the refrigeration air supply system to be closed, the freezing air supply system to be closed, and the two heating units 70 to be closed.

The defrosting control method of the refrigerator in this embodiment, through fully enclosed defrosting and heat removal after defrosting, makes the defrosting process have little influence on the temperature of the freezer and refrigerator, avoids temperature fluctuations, and ensures better food storage. surroundings.

Further, in this embodiment, the step "when the starting defrost condition is satisfied, control the refrigeration system to close, the refrigeration air supply system to close, the freezing air supply system to close, and the two heating units to open, so as to respectively Defrosting of evaporator and refrigerated evaporator" specifically includes:

Steps: when the start-up defrosting conditions are met, control the refrigeration system to shut down, the refrigeration air supply system to open, the freezing air supply system to open, and the two heating units to close, and last for the first preset time period;

Steps: controlling the shutdown of the refrigeration system, the shutdown of the refrigeration air supply system, the shutdown of the refrigeration air supply system, and the activation of the two heating units, so as to defrost the refrigeration evaporator and the refrigeration evaporator respectively.

Specifically, when the defrosting start condition is satisfied (step S101-Y), the control module 65 first controls the refrigerator 100 to enter a "pre-defrosting state" (step S102). In this embodiment, when the refrigerator 100 is in the pre-defrosting state, the control system 60 controls the refrigeration system 30 to be turned off, at least the refrigerating air supply system and the refrigerating air supply system to be turned on, and both One heating unit 70 is turned off. That is to say, the pre-defrosting state has two different implementation modes. First, the control system 60 controls the refrigeration system 30 to close, the refrigerating air supply system to open, the freezing air supply system to open, and the two heating units 70 to close; another, the control system 60 controls the refrigeration system 30 to close, the refrigeration air supply system to open, the freezing air supply system to open, and the two heating units 70 to close. In this way, not only the residual cold of the freezing evaporator 331 and the refrigerating evaporator 332 can be used to regulate the temperature of the freezing chamber 21 and the refrigerating chamber 22 respectively, but also the hot air flow of the freezing chamber 21 and the refrigerating chamber 22 can be used to realize preliminary defrosting. It has the effect of saving energy, reducing consumption and defrosting and humidifying.

As the refrigerator 100 enters the pre-defrosting state, the timing module 63 synchronously counts the duration t1 of the pre-defrosting state; the setting module 61 acquires in advance a first preset time period T1 corresponding to the time t1 , T1 can take a value of 3 minutes; the judging module 64 compares the size relationship between the time t1 and the first preset time period T1 (step S103): when t1<T1 (step S103-N), continue to maintain the preset In the defrosting state, when t1≥T1 (step S103-Y), the control module 65 controls the refrigerator 100 to enter the "defrosting state".

Further, the step "after the defrosting stop condition is satisfied, control the two heating units to be closed, the refrigeration system to be opened and the refrigerant to flow through the freezing evaporator, the refrigeration air supply system to be closed, the refrigeration air supply system to be closed, and continue Until the first preset condition is met" specifically includes:

Steps: After the defrosting stop condition is satisfied, control the two heating units to be turned off, the refrigeration system to be turned off, the refrigerating air supply system to be turned off, and the freezing air supply system to be turned off, and last for a second preset time period;

Steps: controlling the two heating units to be closed, the refrigeration system to be turned on and the refrigerant to flow through the refrigerated evaporator, the refrigerated air supply system to be closed, the refrigerated air supply system to be closed, and continue until the first preset condition is met.

Specifically, that is to say, when the defrosting stop condition is satisfied (step S105-Y), the control module 65 first controls the refrigerator 100 to enter the "shutdown state" (step S106), and maintains the shutdown state—the first After a preset time period T2, the refrigerator 100 is then controlled to enter the "heat removal state" (step S108).

When the refrigerator 100 is in the shutdown state, the timing module 63 synchronously counts the duration t2 of the shutdown state; the setting module 61 pre-acquires the second preset time period T2, and T2 can take a value within the range of 3 to 5 minutes; The judging module 64 compares the size relationship between the time t2 and the second preset time period T2 (step S107): when t2<T2 (step S107-N), continue to maintain the shutdown state, and when t2≥T2 ( In step S107-Y), the control module 65 controls the refrigerator 100 to enter the heat removal state. In this way, during the process of maintaining the shutdown state for the second preset time period T2, the problem of pressure imbalance/sudden change of the refrigerant in the passage caused by heating and defrosting is alleviated, and the "defrosting state" is avoided. "After entering the "heat removal state" immediately, the damage to the compressor caused by it can play a role in protecting the compressor.

Further, referring to Fig. 5, in this embodiment, the cooling mode includes:

Steps: controlling the refrigeration system to be turned on and allowing the refrigerant to flow through the refrigerated evaporator, the refrigerated air supply system to be turned off, the refrigerated air supply system to be turned on, and the two heating units to be turned off, so as to supply cooling to the freezer;

Specifically, the control module 65 controls the refrigerator 100 to enter the "freezing and cooling state" (step S201). The refrigerant only flows through the freezing evaporator 331 of the two evaporators 331, 332, the refrigerating air supply system is closed, the freezing air supply system is opened, and the two heating units 70 are closed to supply the freezing chamber 21. cold, thereby lowering the temperature of the freezer compartment 21.

Step: when the fourth preset time period is reached or when the temperature Tf of the freezing chamber reaches the freezing preset temperature value before the fourth preset time period is reached, the refrigeration system is controlled to open and the refrigerant flows through the freezing evaporator and refrigerating evaporator, the refrigerating air supply system is turned on, the freezing air supply system is turned on, and the two heating units are turned off, so as to supply cooling to the freezer and refrigerating chamber at the same time;

Specifically, when the refrigerator 100 enters the freezing and cooling state, the timing module 63 synchronously counts the duration t4 of the freezing and cooling state. As the freezing and cooling state continues, that is, as the time t4 increases, the temperature Tf decreases gradually.

The judging module 64 judges whether the time t4 reaches the fourth preset time period T4 (step S202), wherein the fourth preset time period T4 is obtained by the setting module 61 and T4 can take a value within the range of 5~10min . When t4≥T4 (step S202-Y), the control module 65 controls the refrigerator 100 to enter the "synchronous cooling state" (step S204); when t4<T4 (step S202-N), the judging module 64 judges whether the temperature Tf Decrease to the freezing preset temperature Tfset (step S203 ), wherein the freezing preset temperature Tfset is pre-acquired by the setting module 61 . When Tf>Tfset (step S203-N), the control module 65 controls the refrigerator 100 to continue to maintain the freezing and cooling state; when Tf≤Tfset (step S203-Y), the control module 65 controls the refrigerator 100 to enter the "synchronous cooling state" (step S204).

That is to say, when t4≥T4, or when t4<T4 and Tf≤Tfset, the control module 65 controls the refrigerator 100 to enter the "synchronous cooling state" (step S204). In this embodiment, the synchronous refrigeration state is set as: the control module 65 controls the refrigeration system 30 to open and controls the three-way valve 36 to connect the refrigeration branch circuit so that the refrigerant flows through the refrigeration evaporator 331 and the refrigeration evaporator 332, The refrigerating air supply system is turned on, the freezing air supply system is turned on, and the two heating units are turned off, so as to supply cooling to the freezing chamber 21 and the refrigerating chamber 22 at the same time.

Step: After the temperature Tr of the refrigerating chamber drops to the preset temperature of refrigerating shutdown and the temperature Tf of the freezing chamber drops to the preset temperature of freezing shutdown, the refrigerating mode is ended;

Specifically, as the synchronous refrigeration state continues, both the temperature Tr and the temperature Tf continue to decrease. When the temperature Tr ≤ the refrigerating shutdown preset temperature Troff (step S205-Y), and the temperature Tf ≤ the freezing shutdown preset temperature Tfoff (step S207-Y), the cooling mode ends, The refrigerator 100 is controlled to enter the shutdown state, and the defrosting process is completed.

Wherein, the freezing preset temperature Tfset is not less than the freezing shutdown preset temperature Tfoff.

In this way, the freezing chamber first undergoes the initial cooling in the freezing and cooling state, and then cools down again in the synchronous cooling state, which can reduce the opening and running time of the refrigeration system, save energy and reduce consumption, and avoid the cooling of the freezing chamber due to the freezing and cooling state If it is too low, it will cause the phenomenon that the freezing room is too low after the synchronous cooling state, that is, to avoid excessive energy consumption.

Further, the step "terminate the cooling mode after the temperature Tr of the refrigerating chamber drops to the preset temperature for refrigerating shutdown and the temperature Tf of the freezing chamber drops to the preset temperature for freezing shutdown" specifically includes:

Steps: When the temperature Tr of the refrigerating room drops to the preset temperature of refrigerating shutdown, control the refrigerating system to turn on and make the refrigerant flow through the refrigerating evaporator, turn off the refrigerating air supply system, turn on the refrigerating air supply system, and turn off the two heating units. to cool the freezer;

Specifically, that is, when Tr≤Troff (step S205-Y), the control module 65 controls the refrigerator 100 to end the synchronous cooling state and enter the freezing cooling state (step S206 ).

Step: judging whether the temperature Tf reaches the preset temperature of freezing shutdown, if yes, then end the refrigeration mode; if not and the temperature Tr is greater than the preset temperature of refrigeration startup, then return to the step "controlling the refrigeration system to open and make the refrigerant Flow through the refrigerating evaporator and refrigerating evaporator, the refrigerating air supply system is turned on, the refrigerating air supply system is turned on, and the two heating units are turned off, so as to supply cooling to the freezing room and the refrigerating room at the same time”;

Specifically, as the freezing and cooling state (step S206) continues, the temperature Tf continues to decrease, and the judging module 64 compares the magnitude relationship between the temperature Tf and the freezing shutdown preset temperature Tfoff (step S207). When Tf>Tfoff (step S207-N), the judging module 64 compares the magnitude relationship between the temperature Tr and the refrigerating start-up preset temperature Tron (step S208).

Further, if the judgment in step S208 is Y, the control module 65 controls the refrigerator 100 to return to step S204; if the judgment in step S208 is N, the control module 65 controls the refrigerator 100 to continue to maintain the freezing and cooling state until Tf≤Tfoff (step S207 -Y), the cooling mode is ended, the refrigerator 100 is controlled to enter the shutdown state, and the defrosting process is completed.

Compared with the prior art, the beneficial effect of the present invention is that: not only energy-saving defrosting of the evaporator can be realized, but also the influence on the temperature of the freezing chamber and the refrigerating chamber can be reduced during the defrosting process, achieving The effect that the temperature fluctuation of the refrigerator room is small.

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The detailed descriptions listed above are only specific descriptions of feasible implementations of the present invention, and they are not intended to limit the scope of protection of the present invention. All equivalent implementations or changes that do not depart from the technical spirit of the present invention shall be Included within the protection scope of the present invention.

Claims (8)

1. a kind of wind cooling refrigerator, which is characterized in that the refrigerator includes,

Refrigeration system forms the access flowed for refrigerant, including sequentially connected compressor, condenser, anti-condensation pipe, drying Filter and the refrigerating evaporator for controllably accessing the access further include triple valve and are set by the triple valve parallel connection The freezing branch and refrigeration branch being placed between the device for drying and filtering outlet end and the refrigerating evaporator arrival end, it is described cold Hiding branch includes refrigeration evaporator；

Cabinet, limits evaporator room and freezing chamber and refrigerating chamber for storing article, and the evaporator room includes being equipped with The refrigerating evaporator room of the refrigerating evaporator and refrigeration evaporator room equipped with the refrigeration evaporator；

Supply air system is refrigerated, is controllably opened and closed and when activated for the shape between the refrigeration evaporator room and the refrigerating chamber At circulated air comprising refrigeration air duct, refrigeration blower and refrigeration air door, when the closing refrigeration blower and the refrigeration air door When, the refrigeration supply air system is closed；

Supply air system is freezed, is controllably opened and closed and when activated for the shape between the refrigerating evaporator room and the freezing chamber At circulated air comprising freezing air duct, freezing blower and freezing air door, when the closing freezing blower and the freezing air door When, the freezing supply air system is closed；

Two heating units are respectively arranged at the refrigerating evaporator room and the refrigeration evaporator room, and heat production when opening；

Control system is used for: when starting defrost condition meets, controlling the refrigeration system closing, the refrigeration supply air system Open, the freezing supply air system is opened, two heating units are closed, and after continuing the first preset time period, control institute State refrigeration system closing, the refrigeration supply air system is closed, the freezing supply air system is closed, two heating units are opened It opens, to carry out defrost to the refrigeration evaporator and the refrigerating evaporator respectively；To after stopping defrost condition satisfaction, control Two heating units are closed, the refrigeration system is opened and so that refrigerant is flowed through the refrigerating evaporator and be not passed through described Refrigeration evaporator, the refrigeration supply air system are closed, the freezing supply air system is closed, and are continued full to the first preset condition Foot；Control the refrigeration system unlatching, at least one unlatching of the refrigeration supply air system and the freezing supply air system, two The heating unit is closed, so that the refrigerator enters refrigeration mode.

2. wind cooling refrigerator according to claim 1, which is characterized in that the control system is also used to: in the stoppingization After ice-lolly part meets, the heating unit of control two is closed, the refrigeration system is closed, the refrigeration supply air system is closed Close, the freezing supply air system is closed, and after continuing the second preset time period, the heating units of control two close, are described Refrigeration system opens and refrigerant is made to flow through the refrigerating evaporator, the refrigeration supply air system is closed, freezing air-supply system System is closed, and continues to first preset condition to meet.

3. wind cooling refrigerator according to claim 1, which is characterized in that first preset condition is set as the frozen steamed The temperature Td for sending out device is less than or equal to defrost and removes hot preset temperature, is less than or, first preset condition is set as the temperature Td The mono- fiducial temperature value of temperature Tf of the freezing chamber, or, first preset condition is arranged via third preset time period.

4. wind cooling refrigerator according to claim 1, which is characterized in that when the refrigerator enters the refrigeration mode, institute Control system is stated to be also used to: control the refrigeration system open and make refrigerant flow through the refrigerating evaporator, it is described refrigeration give Wind system is closed, the freezing supply air system is opened, two heating units are closed；When reaching four preset time periods or When the temperature Tf of the freezing chamber drops to freezing preset temperature when not up to described 4th preset time period, the system is controlled Cooling system is opened and refrigerant is made to flow through the refrigerating evaporator and the refrigeration evaporator, the refrigeration supply air system is opened, The freezing supply air system is opened, two heating units are closed；Until the temperature Tr of the refrigerating chamber drops to refrigeration and closes After machine preset temperature and the temperature Tf drop to freezing shutdown preset temperature, terminate the refrigeration mode；

Wherein, the freezing preset temperature is not less than freezing shutdown preset temperature.

5. a kind of defrosting control method of wind cooling refrigerator, which is characterized in that the refrigerator includes,

Refrigeration system forms the access flowed for refrigerant, including sequentially connected compressor, condenser, anti-condensation pipe, drying Filter and the refrigerating evaporator for controllably accessing the access further include triple valve and are set by the triple valve parallel connection The freezing branch and refrigeration branch being placed between the device for drying and filtering outlet end and the refrigerating evaporator arrival end, it is described cold Hiding branch includes refrigeration evaporator；

Cabinet, limits evaporator room and freezing chamber and refrigerating chamber for storing article, and the evaporator room includes being equipped with The refrigerating evaporator room of the refrigerating evaporator and refrigeration evaporator room equipped with the refrigeration evaporator；

Supply air system is refrigerated, is controllably opened and closed and when activated for the shape between the refrigeration evaporator room and the refrigerating chamber At circulated air comprising refrigeration air duct, refrigeration blower and refrigeration air door, when the closing refrigeration blower and the refrigeration air door When, the refrigeration supply air system is closed；

Supply air system is freezed, is controllably opened and closed and when activated for the shape between the refrigerating evaporator room and the freezing chamber At circulated air comprising freezing air duct, freezing blower and freezing air door, when the closing freezing blower and the freezing air door When, the freezing supply air system is closed；

Two heating units are respectively arranged at the refrigerating evaporator room and the refrigeration evaporator room, and heat production when opening；

The method includes the steps:

When starting defrost condition meets, the refrigeration system closing is controlled, the refrigeration supply air system is opened, the freezing is sent Wind system is opened, two heating units are closed, and after continuing the first preset time period, and control refrigeration system closes, refrigeration Supply air system is closed, freezing supply air system is closed, two heating units are opened, respectively to refrigeration evaporator and refrigerating evaporator Carry out defrost；

After stopping defrost condition and meeting, two heating units closings are controlled, refrigeration system is opened and it is cold to flow through refrigerant Freeze evaporator and be not passed through refrigeration evaporator, refrigeration supply air system is closed, freezing supply air system is closed, and continue to first default Condition meets；

Control at least one unlatching of refrigeration system unlatching, refrigeration supply air system and freezing supply air system, two heating units close It closes, so that refrigerator enters refrigeration mode.

6. defrosting control method according to claim 5, which is characterized in that the step " meets in stopping defrost condition Later, two heating units closings are controlled, refrigeration system is opened and refrigerant is made to flow through refrigerating evaporator, refrigeration supply air system pass Close, freeze supply air system closing, and continue to the first preset condition to meet " include:

After stopping defrost condition and meeting, two heating units closings are controlled, refrigeration system is closed, refrigeration supply air system is closed It closes, freeze supply air system closing, and continue the second preset time period；

Two heating units closings are controlled, refrigeration system is opened and refrigerant is made to flow through refrigerating evaporator, refrigeration supply air system pass It closes, freeze supply air system closing, and continue to the first preset condition to meet.

7. defrosting control method according to claim 5, which is characterized in that first preset condition is set as frozen steamed The temperature Td for sending out device is less than or equal to defrost and removes hot preset temperature, is less than or, first preset condition is set as the temperature Td The mono- fiducial temperature value of temperature Tf of the freezing chamber, or, first preset condition is arranged via third preset time period.

8. defrosting control method according to claim 5, which is characterized in that the refrigeration mode comprising steps of

Control refrigeration system opens and refrigerant is made to flow through refrigerating evaporator, refrigeration supply air system is closed, freezing supply air system is opened It opens, two heating units closings, to freezing chamber cooling supply；

When reaching four preset time periods or when the temperature Tf of not up to the 4th preset time period and freezing chamber reaches cold When freezing preset temperature, control refrigeration system opens and refrigerant is made to flow through refrigerating evaporator and refrigeration evaporator, refrigeration air-supply system It unites and opens, freezes supply air system unlatching, two heating units closings, to freezing chamber and refrigerating chamber while cooling supply；

Temperature Tr to refrigerating chamber drops to the temperature Tf of refrigeration shutdown preset temperature and freezing chamber and reaches the default temperature of freezing shutdown After degree, terminate the refrigeration mode；

Wherein, the freezing preset temperature is not less than freezing shutdown preset temperature.