WO2015180436A1 - Method for controlling dry food chamber, and refrigerator - Google Patents

Abstract

Disclosed are a method for controlling a dry food chamber (2) and a refrigerator using same. In the method, the start-up time of a fan (6) or the opening time of a cooling channel is set to be later than the start-up time of a compressor so that the average relative humidity and the fluctuation of the relative humidity in the dry food chamber (2) can be reduced.

Description

Dry matter room control method and refrigerator

This application claims the Chinese patent application with the application date being July 31, 2014, the application number is 201410372522.4, the invention name is “dry matter room control method and refrigerator”, and the application date is May 30, 2014, and the application number is Japanese Patent Application No. 201410236741.X, the entire disclosure of which is incorporated herein by reference.

[Technical Field]

The invention relates to a method for controlling a dry matter room and a refrigerator, belonging to the field of household appliances.

 【Background technique】

Humidity generally refers to air humidity in meteorology, which is the content of water vapor in the air, and does not contain liquid or solid water. Air without water vapor is called dry air. Since the water vapor in the atmosphere can account for 0% to 4% of the volume of the air, it is generally referred to as the composition of the components in the dry air when the components of the various gases in the air are listed.

"Absolute humidity" refers to the mass of water vapor contained in a volume of air, typically in grams per cubic meter. The maximum absolute humidity is the highest humidity in saturation.

"Relative Humidity" (RH) is the ratio between absolute humidity and maximum humidity, and its value indicates how high the saturation of water vapor is. Air with a relative humidity of 100% is saturated air. The relative humidity is 50% of the air containing half of the water vapor reaching the saturation point of the air at the same temperature. Water vapor in the air having a relative humidity of more than 100% generally condenses water or ice. As the temperature increases, the amount of water vapor that can be dissolved in the air increases, and the absolute humidity of the air increases. When the relative humidity of the air exceeds 100%, the water vapor in the air will condense, which can be used to cool down and dehumidify; then the temperature will rise and the relative humidity will decrease, which can be used for drying purposes.

The drying of food is mainly related to relative humidity. The relative humidity is low and the food is less likely to get moisture.

A storage room with low relative humidity developed in the refrigerator can be used to store various dry foods or foods that need to be dried (such as tea leaves, dried fruits, etc.). Dry foods are sensitive to the relative humidity of the storage environment, usually require a relatively low relative humidity, and can be kept within a relatively small range of relative humidity changes, otherwise it can easily lead to deterioration of food or affect quality.

The traditional way to reduce the relative humidity of the compartment is to use the principle of cooling and dehumidification, that is, using the cooling function of the evaporator, the air in the compartment is cooled down sufficiently by the evaporator, and the water vapor is dehumidified to obtain the air with lower absolute moisture content, and then Replace the air with a high absolute moisture content in the room (ie, the air with a higher absolute moisture content in the room is driven out, and the absolute moisture content in the room is reduced), and then the temperature is raised by the heating of the surrounding environment. In order to achieve a lower relative humidity and achieve the purpose of drying.

However, the following problems exist in the dry matter room:

1. At the end of a refrigeration cycle, the air supply to the dry matter chamber at the beginning of the compressor shutdown causes the relative humidity of the dry matter chamber to increase: (1) After the compressor is shut down, the refrigeration system begins to pressure balance, and the high pressure side heats the cooling. When the agent flows into the low pressure side, the temperature of the evaporator will gradually increase, causing the frost on the evaporator to accelerate sublimation, and the relative humidity of the air near the evaporator will be higher. (2) When there is defrosting, the frost of the evaporator will melt, the evaporation of the defrosting water is accelerated due to the increase of temperature, the relative humidity of the air near the evaporator is high, and a part of the water adheres to the evaporator. When the next compressor is turned on, it is sent to the dry room by the fan to humidify the dry room. (3) At the beginning of the compressor shutdown, the evaporator is at a lower temperature than the surrounding compartment and the environment, and is affected by the leakage heat from the higher temperature compartment and the environment, and the evaporator and its surrounding air. The temperature will gradually increase, causing the evaporator's frost to melt or sublimate. The result is reflected in the whole dehumidification process: each time the compressor is turned on, the relative humidity in the dry matter chamber will generate a peak of increasing relative humidity with the supply of air to the dry matter chamber.

2. When the compressor is started, due to the high surface temperature of the evaporator, the air temperature near the evaporator has not cooled to a temperature sufficient to precipitate moisture, that is, the dew point temperature of the air is not reached (ie, when the humid air temperature reaches the dew point temperature) That is, the saturation state is reached. When the temperature is lowered, water will be analyzed to achieve the purpose of dehumidification; conversely, when the temperature of the humid air is above the dew point temperature, the moisture in the humid air will not precipitate, and the purpose of dehumidification cannot be achieved.

 [Summary of the Invention]

It is an object of the present invention to provide a method of controlling a dry matter chamber which can reduce fluctuations in average relative humidity and relative humidity of a dry matter chamber.

In order to achieve the foregoing object, the present invention adopts the following technical solution: a method for controlling a dry matter chamber, the dry matter chamber is disposed in a refrigerator, and an air inlet of the dry matter chamber is connected to a cooling chamber provided with an evaporator through a cold passage. One side of the evaporator is provided with a fan for introducing air in the cooling chamber into the dry matter chamber, and the opening time of the cooling passage or the fan starting time is later than the starting time of the compressor in the refrigerator.

As a further improvement of the present invention, the opening time of the cooling passage is later than the starting time of the fan.

As a further improvement of the invention, the opening time of the cooling channel or the starting time of the fan is determined as follows:

S1: obtaining an absolute humidity ρ1 in the dry matter room, and obtaining an absolute humidity ρ2 in the cooling room;

S2: After the absolute humidity ρ1 is higher than the absolute humidity ρ2, the cold passage is opened or the fan is started.

As a further improvement of the present invention, the dry object chamber is provided with a first temperature sensor and a first humidity sensor respectively for detecting the temperature and the relative humidity in the dry object chamber, and the cooling chamber is respectively provided for detecting the cooling room. a second temperature sensor and a second humidity sensor of temperature and relative humidity, wherein the refrigerator is provided with a controller, and the specific implementation of the step S1 is as follows: the controller receives and processes the first temperature sensor The detected temperature and the relative humidity detected by the first humidity sensor to obtain an absolute humidity ρ1; the controller receives and processes the temperature detected by the second temperature sensor and the relative humidity detected by the second humidity sensor to obtain Absolute humidity ρ2.

As a further improvement of the present invention, the dry object chamber is provided with a first temperature sensor and a humidity sensor respectively for detecting the temperature and the relative humidity in the dry object chamber, and the cooling chamber is provided with a second device for detecting the temperature in the cooling chamber. a temperature sensor, the refrigerator is provided with a controller, and when the relative humidity in the cooling chamber is 100%, the specific implementation of the step S1 is as follows: the controller receives and processes the first temperature sensor The relative humidity detected by the detected temperature and humidity sensor is obtained to obtain an absolute humidity ρ1, and the controller receives and processes the temperature detected by the second temperature sensor to obtain an absolute humidity ρ2.

As a further improvement of the invention, the opening time of the cooling channel or the starting time of the fan is determined as follows:

S1: obtaining a dew point temperature in the dry object room, and obtaining a temperature in the cooling room;

S2: When the temperature in the cooling chamber is lower than the dew point temperature in the dry object chamber, the cooling channel is opened or the fan is started.

As a further improvement of the present invention, the dry object chamber is provided with a first temperature sensor and a humidity sensor respectively for detecting the temperature and the relative humidity in the dry object chamber, and the cooling chamber is respectively provided for detecting the temperature in the cooling chamber. a second temperature sensor, wherein the refrigerator is provided with a controller. When the relative humidity in the cooling chamber is 100%, the specific implementation of the step S1 is as follows: the controller receives and processes the first temperature The relative humidity detected by the temperature and humidity sensors detected by the sensor is used to obtain the dew point temperature in the dry object chamber; the temperature of the cooling chamber is detected by the second temperature sensor in the cooling chamber.

As a further improvement of the present invention, one side of the cold passage is provided with a damper that opens or closes the cold passage.

The present invention also provides a refrigerator having a dry matter chamber using the above-described control method of the dry matter chamber.

The invention has the beneficial effects that the fluctuation of the average relative humidity and relative humidity of the dry matter chamber can be reduced by making the start-up time of the fan or the opening time of the cold passage later than the start-up time of the compressor.

 [Description of the Drawings]

1 is a partial structural view of a refrigerator according to an embodiment of the present invention, wherein the direction indicated by the arrow in the figure is the air circulation direction.

Fig. 2 is a view showing the dehumidification effect in the dry matter chamber in the case of using the prior art and the method for controlling the dry matter chamber of the present invention.

Fig. 3 is a logic control relationship diagram of the first branching passage opening time of the compressor, the defrosting, the dry matter chamber, and the effect of realizing the relative humidity of the dry matter chamber.

 【detailed description】

Referring to FIG. 1, a refrigerator in an embodiment of the present invention has a refrigerating compartment 1, a freezing compartment, and a refrigeration cycle system. The refrigerating compartment 1 and the freezing compartment are collectively referred to as a refrigerating compartment. The refrigerating compartment 1 is provided with a dry matter chamber 2, wherein the standard temperature in the refrigerating compartment 1 is 0-10 ° C, generally 6-8 ° C; the temperature in the dry compartment 2 is lower than that in the refrigerating compartment 1 The temperature inside is generally 3~5 °C. The refrigeration cycle system includes a condenser, a compressor, an evaporator 3, and a capillary tube, and the refrigeration cycle system is the same as the existing refrigeration cycle system, and thus will not be described in detail. The evaporator 3 is arranged in a cooling chamber 4, and the air inlet 21 of the dry matter chamber 2 communicates with the cooling chamber 4 and the refrigerating compartment 1 through a cold passage 5, which includes a connection to the cooling chamber 4. The main road 51 and the air inlet 21 of the trunk road 51 and the dry matter chamber 2, the first branch road 52 of the refrigerating compartment 1, and the second branch road 53 are respectively connected. One side of the evaporator 3 is provided with a fan 6 that introduces air in the cooling chamber 4 into the refrigerating compartment 1 and the dry compartment 2, and in the present embodiment, the fan 6 is disposed in the cooling chamber 4. One side of the first branch road 52 is provided with a first damper 71 to open or close the first branch road 52, and one side of the second branch road 53 is provided with a second damper 72 to realize the second branch road. 53 is turned on or off. The opening and closing of the first branching passage 52 and the second branching passage 53 are controlled by the first damper 71 and the second damper 72, thereby realizing air replacement in the dry matter chamber 2 and air replacement in the refrigerating compartment 1 respectively. Here, the first branch road 52 may be referred to as a first cold passage, and the second branch passage 53 may be referred to as a second cold passage. a first temperature sensor and a first humidity sensor for detecting temperature and relative humidity in the dry matter chamber 2 are respectively disposed in the dry matter chamber 2, and the cooling chamber 4 is respectively disposed to detect the inside of the cooling chamber 4 a second temperature sensor and a second humidity sensor of temperature and relative humidity, and a controller is disposed in the refrigerator. In this embodiment, the first sub-main road 52 and the second sub-main road 53 are opened or closed by using a damper. In other embodiments, other manners may also be implemented.

The control method of the dry matter chamber 2 of the refrigerator is the opening time of the first branching passage 52 or the starting time of the blower 6 is later than the starting time of the compressor in the refrigerator.

The opening time of the first branch road 52 is later than the starting time of the fan 6. The starting time of the first branch road 52 or the fan 6 is determined by the following three methods, wherein the latter two methods can also accurately achieve the purpose of dehumidification.

The starting time of the first branch road 52 and the fan 6 is preset in the refrigerator. When the compressor is started, the first branch road 52 and the fan 6 are started after reaching a preset time, and the preset time is obtained after multiple tests. time.

Since the relative humidity in the dry matter chamber 2 needs to be kept at a low value (below the refrigerating compartment 1), the air sent into the dry matter chamber 2 needs to be dehumidified, and the criterion for achieving the purpose of dehumidification is: feeding into the dry matter chamber 2 The absolute humidity of the air at the air inlet is lower than the absolute humidity of the air in the dry chamber 2, and since the air in the dry chamber 2 is provided by the cooling chamber 4, the starting time of the first branch road 52 or the fan 6 is determined as follows Way to determine:

S1: obtaining the absolute humidity ρ1 in the dry matter chamber 2, and obtaining the absolute humidity ρ2 in the cooling chamber 4;

S2: After the absolute humidity ρ1 is higher than the absolute humidity ρ2, the first branching passage 52 is opened or the fan 6 is started. The opening of the first branch gate 52 is achieved by controlling the opening of the first damper 71 by the controller.

The specific implementation manner of the step S1 is as follows: the controller receives and processes the temperature detected by the first temperature sensor and the relative humidity detected by the first humidity sensor to obtain an absolute humidity ρ1, and the controller receives the The temperature detected by the second temperature sensor and the relative humidity detected by the second humidity sensor are processed to obtain an absolute humidity ρ2.

When the relative humidity in the cooling chamber 4 is 100%, that is, when condensation has occurred on the evaporator 3, the specific implementation of the S1 step may also be as follows: the controller receives and processes the first The temperature detected by a temperature sensor and the relative humidity detected by the first humidity sensor obtain an absolute humidity ρ1, and the controller receives and processes the temperature obtained by the second temperature sensor to obtain an absolute humidity ρ2. At this time, it is not necessary to detect the relative humidity by using the second humidity sensor.

It should be noted here that when the first branch passage 52 of the dry matter chamber 2 is not opened, the air in the cooling chamber 4 will be sent to other compartments, such as the refrigerating compartment 1 or the freezing compartment.

Since the absolute humidity value is not easily measured in the refrigerator, the temperature can be used as a standard in the specific control. At this time, the start time of the first branch road 52 or the fan 6 is determined by the following method:

S1: obtaining the dew point temperature in the dry matter chamber 2, obtaining the temperature in the cooling chamber 4, and the dew point temperature in the dry matter chamber 2 and the temperature in the cooling chamber 4 are obtained by: the controller receiving and processing the first in the dry matter chamber 2 The temperature detected by the temperature sensor and the relative humidity detected by the first humidity sensor obtain a dew point temperature, and the temperature of the cooling chamber 4 is detected by a second temperature sensor in the cooling chamber 4, and the dew point temperature is controlled The preset wet air enthalpy map in the device is obtained by the controller, and is calculated and queried by the controller according to the detected relative humidity detected by the temperature sensor and the temperature sensor;

S2: When the temperature in the cooling chamber 4 is lower than the dew point temperature in the dry matter chamber 2, the first branching passage 52 is opened or the fan 6 is started. The opening of the first branch gate 52 is achieved by controlling the opening of the first damper 71 by the controller.

Assumption: when the compressor is turned on, the dry chamber temperature t1, relative humidity RH1

Cooling chamber temperature t2, air relative humidity RH2

Then: according to the known value of dry matter 2 T1, RH1, then the value of t0 (ie, the dew point temperature of the dry matter chamber) can be calculated, and when the air in the cooling chamber 4 is cooled and dehumidified by the evaporator, the relative humidity RH2=100% in the cooling chamber, so, when t2 When the value is lowered to t0, it is ensured that the absolute humidity value of the air sent into the dry matter chamber 2 is lower than the absolute humidity value of the air in the dry matter chamber 2.

Example:

Assume that the dry matter room is t1=3°C, RH1=40%,

The dew point temperature in the dry matter room is t0=-9.27°C, (the dew point temperature can be found according to the wet air phlegm map)

Therefore, after the air in the cooling chamber 4 is cooled and dehumidified by the evaporator, the relative humidity RH2 in the cooling chamber 4 is 100%, and when t2 is lowered to t0=-9.27 °C, the cold passage of the dry matter chamber 2 can be opened, thereby The time x at which the first branch road 52 delays the compressor opening is determined, that is, the time when t2 is lowered to t0.

When the compressor is turned on, the opening of the first branch passage 52 is delayed, the relative humidity fluctuation of the dry matter chamber 2 is reduced, and the relative humidity fluctuation and the average relative humidity in the dry matter chamber 2 are reduced. The average relative humidity is the average of the relative humidity during the use of the dryroom. After adopting this method, the dehumidification effect of the dry matter chamber 2 is shown in Fig. 2. Similarly, if the opening of the delayed first branch road 52 is changed to the start of the delay fan, the relative humidity fluctuation of the dry matter chamber 2 can be reduced, and the relative humidity fluctuation and the average relative humidity in the dry matter chamber 2 can be reduced. When the delay is used to activate the fan 6, the first sub-main road 52 is always open, or the first sub-main road 52 is simultaneously opened when the fan 6 is started, or the first sub-main road 52 is opened after the fan 6 is started. .

Since the relative humidity fluctuation of the dry matter chamber 2 generally occurs at the start of the compressor, the control method of the dry matter chamber 2 is often used when the compressor is started, in particular, after the defrosting compressor is started. In order to further reduce the fluctuation of the average relative humidity and the relative humidity of the dry matter chamber 2, and to achieve the purpose of dehumidification, after the defrosting, the opening time of the first branch road 52 may be delayed after the second start of the compressor. Referring to FIG. 3, the logic control relationship between the compressor, the defrosting, the opening time of the first branching passage 52 of the dry matter chamber 2, and the effect of the relative humidity of the dry matter chamber 2 is shown.

In summary, by making the opening time of the first branching passage 52 or the starting time of the fan 6 later than the starting time of the compressor, fluctuations in the average relative humidity and relative humidity of the dry matter chamber 2 can be reduced.

While the preferred embodiment of the present invention has been disclosed by way of example the embodiments of the invention Improvements, additions and substitutions are possible.

Claims (9)

1. A method for controlling a dry matter chamber, wherein the dry matter chamber is disposed in a refrigerator, and an air inlet of the dry matter chamber is connected to a cooling chamber in which an evaporator is disposed through a cold passage, and one side of the evaporator is provided to cool the indoor The air is introduced into the fan in the dry matter room, and is characterized in that the opening time of the cooling channel or the fan starting time is later than the starting time of the compressor in the refrigerator.
2. The method of controlling a dry matter chamber according to claim 1, wherein the opening time of the cold flow passage is later than the start time of the wind turbine.
3. The method for controlling a dry matter chamber according to claim 1, wherein the opening time of the cooling channel or the starting time of the fan is determined as follows:

   S1: obtaining an absolute humidity ρ1 in the dry matter room, and obtaining an absolute humidity ρ2 in the cooling room;

   S2: After the absolute humidity ρ1 is higher than the absolute humidity ρ2, the cold passage is opened or the fan is started.
4. The method for controlling a dry matter chamber according to claim 3, wherein the dry object chamber is provided with a first temperature sensor and a first humidity sensor for detecting temperature and relative humidity in the dry matter chamber, respectively, the cooling The second temperature sensor and the second humidity sensor are respectively arranged to detect the temperature and the relative humidity in the cooling chamber, and the controller is provided with a controller. The specific implementation manner of the step S1 is as follows: the controller receives And processing the temperature detected by the first temperature sensor and the relative humidity detected by the first humidity sensor to obtain an absolute humidity ρ1; the controller receives and processes the temperature and the second humidity detected by the second temperature sensor The relative humidity detected by the sensor is obtained to obtain an absolute humidity ρ2.
5. The method for controlling a dry matter chamber according to claim 3, wherein the dry object chamber is provided with a first temperature sensor and a humidity sensor for detecting temperature and relative humidity in the dry object chamber, respectively, the cooling room setting There is a second temperature sensor for detecting the temperature in the cooling chamber, and the refrigerator is provided with a controller. When the relative humidity in the cooling chamber is 100%, the specific implementation manner of the step S1 is as follows: the controller Receiving and processing the relative humidity detected by the temperature and humidity sensors detected by the first temperature sensor to obtain an absolute humidity ρ1, and the controller receives and processes the temperature detected by the second temperature sensor to obtain an absolute humidity ρ2 .
6. The method for controlling a dry matter chamber according to claim 1, wherein the opening time of the cooling channel or the starting time of the fan is determined as follows:

   S1: obtaining a dew point temperature in the dry object room, and obtaining a temperature in the cooling room;

   S2: When the temperature in the cooling chamber is lower than the dew point temperature in the dry object chamber, the cooling channel is opened or the fan is started.
7. The method for controlling a dry matter chamber according to claim 6, wherein the dry object chamber is provided with a first temperature sensor and a humidity sensor for detecting temperature and relative humidity in the dry object chamber, respectively, wherein the cooling room is set There is a second temperature sensor for detecting the temperature in the cooling chamber, wherein the refrigerator is provided with a controller. When the relative humidity in the cooling chamber is 100%, the specific implementation manner of the step S1 is as follows: The controller receives and processes the relative humidity detected by the temperature and humidity sensors detected by the first temperature sensor to obtain a dew point temperature in the dry object chamber; the temperature of the cooling chamber is detected by a second temperature sensor in the cooling chamber.
8. The method of controlling a dry matter chamber according to claim 1, wherein one side of the cold flow passage is provided with a damper that opens or closes the cold flow passage.
9. A refrigerator characterized in that the refrigerator has a dry matter chamber using a control method of the dry matter chamber according to any one of claims 1 to 8.