CN118275609A - Refrigerator and odor detection method thereof - Google Patents

Abstract

The invention discloses a refrigerator and a smell detection method thereof, comprising that one end of a gas pipe is arranged in a storage room, the other end of the gas pipe is connected with a smell detection device, and a gas pump is arranged on the gas pipe, wherein the smell detection device is arranged on one side of a heat insulation layer facing to a box shell or on the outer side of the box shell, and a controller is used for controlling the gas pump to work when detecting that a refrigerator door body or a drawer door body is in a closed state and the single duration time of the closed state is longer than the preset duration time so as to pump the gas in the storage room into the gas pipe; acquiring an odor signal detected by an odor detection device; based on the scent signal, the freshness of the food in the compartment is obtained. The embodiment of the invention can avoid the situation that the detection part of the odor sensor is subjected to condensation so as to generate misjudgment, ensure the accuracy of the odor detection result, avoid the diffusion of gas to the outside of the refrigerator when the odor detection is carried out, improve the accuracy of the odor detection result and avoid the error of the food freshness result.

Description

Refrigerator and odor detection method thereof

Technical Field

The invention relates to the technical field of refrigerators, in particular to a refrigerator and an odor detection method thereof.

Background

With the development of technology and the continuous improvement of living standard of people, the use of various household appliances such as refrigerators is becoming more and more popular, and refrigerators have become indispensable household appliances in people's life. In actual use of a refrigerator, a user often stores food in a storage compartment, but the food deteriorates after a long time to generate unpleasant smell.

At present, an odor sensor is arranged in a storage room of a refrigerator to detect odor in the refrigerator and judge food freshness according to an odor detection result, but the scheme has the following problems: (1) In a low-temperature environment, dew condensation is easy to occur on a detection part of the odor sensor, so that erroneous judgment occurs; (2) In an environment where a refrigerator frequently opens and closes a door, gas odor to be detected can diffuse out of the refrigerator, so that the concentration of the gas transmitted to the odor sensor is reduced, the odor detection result is affected, and the food freshness result is wrong.

Disclosure of Invention

The refrigerator and the odor detection method thereof can avoid the situation that the detection part of the odor sensor is subjected to condensation so as to generate misjudgment, ensure the accuracy of the odor detection result, prevent gas from diffusing outside the refrigerator during odor detection, improve the accuracy of the odor detection result and avoid the error of the food freshness result.

To achieve the above object, an embodiment of the present invention provides a refrigerator including:

The box body comprises a box shell, a box liner and a heat insulation layer arranged between the box shell and the box liner; wherein the box liner defines a plurality of storage compartments;

the refrigerator door body is arranged at the opening of the refrigerator body;

at least one air pipe with one end set inside the storage room and the other end connected to the odor detecting device; the air pump is also arranged on the air pipe and is used for pumping the air in the storage room into the air pipe;

The odor detection device is arranged on one side of the heat insulation layer facing the box shell or the outer side of the box shell and is used for detecting odor signals of gas in the gas transmission pipe;

The door opening and closing sensor is arranged on the refrigerator door body or the drawer door body in the storage room and is used for detecting the opening and closing state of the refrigerator door body or the drawer door body;

the controller is used for controlling the air pump to work when detecting that the refrigerator door body or the drawer door body is in a closed state and the single duration time of the closed state is longer than the preset duration time so as to pump the air in the storage room into the air pipe;

Acquiring an odor signal detected by the odor detection device;

Based on the odor signal, the freshness of the food in the compartment is obtained.

As an improvement of the above, the case further defines a compressor compartment for mounting a compressor, wherein the compressor compartment is provided between the case housing and the heat insulating layer;

when the odor detection device is arranged on one side of the heat insulation layer, which faces the box shell, the odor detection device is arranged in the compressor bin, and a part of the air pipe is wound on the outer surface of the compressor.

As an improvement of the above-mentioned scheme, the controller is further configured to control the operation of the air pump by:

and periodically controlling the air pump to start until the air pump is detected to stop for a preset number of times.

As an improvement of the above, the obtaining the freshness of the food in the storage compartment based on the odor signal includes:

performing dimension reduction treatment on the odor signal by adopting a principal component analysis method to obtain a first odor component template of the gas in the gas transmission pipe;

Comparing the first odor component template with a plurality of second odor component templates in a preset odor component template library to obtain a comparison result;

And obtaining the freshness of the food in the storage room according to the comparison result.

As an improvement of the above-mentioned aspect, the obtaining the freshness of the food in the storage compartment according to the comparison result includes:

When the comparison result shows that the odor signal on the first odor component template falls into a first preset area of the second odor component template, judging that the freshness of the food in the storage compartment is deteriorated;

And when the comparison result shows that the odor signal on the first odor component template falls outside the first preset area of the second odor component template, judging that the freshness of the food in the storage room is fresh.

As an improvement of the above, the obtaining the freshness of the food in the storage compartment based on the odor signal includes:

performing cluster analysis on the odor signal and a plurality of preset sample odor signals;

when the odor signal after the cluster analysis is positioned in a second preset area of a preset sample cluster analysis result, judging that the freshness of the food in the storage room is deteriorated;

and when the odor signal after the cluster analysis is positioned outside the second preset area, judging that the freshness of the food in the storage room is fresh.

To achieve the above object, an embodiment of the present invention provides a method for detecting smell of a refrigerator, the refrigerator at least including: at least one air pipe, an air pump arranged on the air pipe, an odor detection device arranged on one side of the heat insulation layer facing the refrigerator shell or on the outer side of the refrigerator shell, and a door opening and closing sensor arranged on the refrigerator door body or the drawer door body of the refrigerator; one end of the air pipe is arranged in a storage room of the refrigerator, the other end of the air pipe is connected with the odor detection device, and the refrigerator odor detection method comprises the following steps:

When the refrigerator door body or the drawer door body is detected to be in a closed state, and the single duration time of the closed state is longer than the preset duration time, controlling the air pump to work so as to pump the air in the storage room into the air pipe;

Acquiring an odor signal detected by the odor detection device;

Based on the odor signal, the freshness of the food in the compartment is obtained.

As an improvement of the above-mentioned scheme, the refrigerator body further defines a compressor compartment for mounting a compressor, wherein the compressor compartment is provided between the refrigerator housing and the heat insulating layer;

when the odor detection device is arranged on one side of the heat insulation layer, which faces the box shell, the odor detection device is arranged in the compressor bin, and a part of the air pipe is wound on the outer surface of the compressor.

As an improvement of the above, the obtaining the freshness of the food in the storage compartment based on the odor signal includes:

performing dimension reduction treatment on the odor signal by adopting a principal component analysis method to obtain a first odor component template of the gas in the gas transmission pipe;

Comparing the first odor component template with a plurality of second odor component templates in a preset odor component template library to obtain a comparison result;

And obtaining the freshness of the food in the storage room according to the comparison result.

As an improvement of the above-mentioned aspect, the obtaining the freshness of the food in the storage compartment according to the comparison result includes:

When the comparison result shows that the odor signal on the first odor component template falls into a first preset area of the second odor component template, judging that the freshness of the food in the storage compartment is deteriorated;

And when the comparison result shows that the odor signal on the first odor component template falls outside the first preset area of the second odor component template, judging that the freshness of the food in the storage room is fresh.

Compared with the prior art, the refrigerator and the odor detection method thereof provided by the embodiment of the invention have the advantages that the odor detection device is arranged on one side of the heat insulation layer of the refrigerator, which faces the refrigerator shell, or the outer side of the refrigerator shell, so that the odor detection device is in a room temperature environment, and meanwhile, the conveyed gas is warmed to the room temperature from low temperature, so that the detection part of the odor detection device is difficult to generate dew, and the odor detection result is ensured; the odor detection device which is used for pumping the gas in the storage room after the refrigerator is closed for a preset duration is used for odor detection, so that the gas can be prevented from diffusing out of the refrigerator when the odor detection is performed, the odor detection device has enough sensitivity, the accuracy of the odor detection result is improved, and the food freshness result is prevented from being wrong.

Drawings

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

fig. 2 is a first block diagram of a refrigerator according to an embodiment of the present invention;

fig. 3 is a block diagram of a refrigerating system of a refrigerator according to an embodiment of the present invention;

FIG. 4 is a first workflow diagram of a controller provided by an embodiment of the present invention;

Fig. 5 is a second block diagram of a refrigerator according to an embodiment of the present invention;

FIG. 6 is a second workflow diagram of a controller provided by an embodiment of the present invention;

FIG. 7 is a third workflow diagram of a controller provided by an embodiment of the present invention;

FIG. 8 is a second odor component template diagram provided by an embodiment of the present invention;

FIG. 9 is a fourth operational flow diagram of a controller provided by an embodiment of the present invention;

FIG. 10 is a graph of a cluster analysis result provided by an embodiment of the present invention;

Fig. 11 is a flowchart of a refrigerator smell detection method according to an embodiment of the present invention.

100 Parts of a box body; 101. a case housing; 102. a tank liner; 103. a heat insulating layer; 104. a drawer door body; 200, a refrigerator door body; 300. a gas pipe; 400. an odor detection device; 500. an air pump; 600. a door opening/closing sensor; 1. a compressor; 2. a condenser; 3. an anti-condensation pipe; 4. drying the filter; 5. a capillary tube; 6. an evaporator; 7. a gas-liquid separator.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 to 2, the refrigerator of the present embodiment has an approximately rectangular parallelepiped shape, and includes a cabinet 100 defining a storage space and a plurality of refrigerator door bodies 200 provided at openings of the cabinet 100, wherein the refrigerator door bodies 200 include a door body case located outside the cabinet 100, a door body case located inside the cabinet 100, an upper cover, a lower cover, and a heat insulating layer filled with a heat insulating material, typically a foaming material, located between the door body case, the upper cover, the lower cover. The tank body 100 includes a tank case 101, a tank liner 102, and a heat insulating layer 103 provided between the tank case 101 and the tank liner 102, and the heat insulating layer 103 is filled with a heat insulating material, typically a foam. The cabinet liner 102 defines a number of storage compartments, which may be configured as a refrigerator compartment, a freezer compartment, a temperature change compartment (also known as a fresh food compartment), depending on the application. Each storage compartment corresponds to one or more refrigerator door bodies 200, and the refrigerator door bodies 200 may be pivotally disposed at the opening of the cabinet 100.

At least one air pipe 300 having one end disposed in one of the storage compartments and the other end connected to the odor detecting device 400; an air pump 500 is further arranged on the air pipe 300, and the air pump 500 is used for pumping the air in the storage room into the air pipe 300;

It will be understood that the odor detecting device 400 connected to one end (front end) of the air pipe 300 is disposed in which storage compartment, and the other end (rear end) thereof is connected to detect the odor of the air in the storage compartment. The air pump 500 is further provided on the air pipe 300, and the air pump 500 is provided at any position between the front end of the air pipe 300 and the odor detecting device 400, and may be any position inside the storage compartment, outside the storage compartment, or outside the heat insulating layer 103 (the side of the heat insulating layer 103 facing the tank case 101, the outside of the tank case 101); the air pump 500 is also connected to a controller, which controls the activation of the air pump such that the air pump 500 pumps the air in the storage compartment into the air pipe 300, the rear end of the air pipe 300 connected to the outlet end of the air pump 500 is connected to the suction port of the odor detecting device 400, and the suction port transfers the air pumped into the air pipe 300 by the air pump 500 to the detecting part in the odor detecting device 400 to be detected, and outputs an odor signal. The material and shape of the gas pipe 300 and the type of the gas pump 500 are not particularly limited in the embodiment of the present invention, and the material of the gas pipe 300 may be a metal product such as stainless steel or copper, which does not affect the odor component of the gas, or a resistant material such as fluororesin, and a resin product having solvent properties is preferably used.

The odor detecting device 400 is arranged on one side of the heat insulation layer 103 facing the box casing 101 or on the outer side of the box casing 101, and is used for detecting an odor signal of the gas in the gas pipe 300;

Illustratively, the gas delivery pipe 300 is connected to the odor detecting device 400 disposed outside the heat insulating layer 103 (on the side of the heat insulating layer 103 facing the tank case 101 or the outside of the tank case 101) through a part of the heat insulating layer 103. The odor detection apparatus 400 includes an odor sensor or an array of odor sensors, and the odor detection apparatus 400 has a plurality of sensor elements, each of which outputs a different gas signal for the gas of the storage compartment, the plurality of gas signals constituting a pattern of a specific odor for the gas, and all of the gas signals are transmitted to the controller to be analyzed, thereby determining the freshness of the food. The vibrator of the crystal or the like of the odor detecting apparatus 400 is coated with a polymer film called an induction film, and the polymer film has different adsorption characteristics for different gases. If the oscillator is vibrated at a certain frequency, the odor molecules of the odor are adsorbed to the oscillator, and the vibration frequency is changed, and the odor detecting device 400 outputs the change in the vibration frequency as a signal.

A door opening/closing sensor 600 provided on the refrigerator door 200 or the drawer door 104 in the storage compartment, for detecting an opened/closed state of the refrigerator door 200 or the drawer door 104;

The refrigerator compartment provided by the embodiment of the invention further comprises a drawer assembly, wherein the drawer assembly comprises a drawer door 104, the door opening and closing sensor 600 can be arranged on the drawer door 104, and after the compartment is closed for a preset duration, the air in the refrigerator compartment is pumped to the air pipe, so that the concentration of the air transmitted to the odor detection device 400 is ensured. The position where the door opening/closing sensor 600 is installed in the embodiment of the present invention is not particularly limited, but in the case where a door or a drawer is installed in each storage compartment, it is preferable that the door of the storage compartment storing food material to be detected as odor is stored; the door opening and closing sensor 600 is connected to the controller, and the door opening and closing sensor 600 transmits the detected opening and closing state of the refrigerator door body 200 or the drawer door body 104 to the controller;

referring to fig. 3, fig. 3 is a schematic view of a refrigeration system in a refrigerator according to an embodiment of the present invention, the refrigeration system includes a compressor 1, a condenser 2, an anti-condensation pipe 3, a dry filter 4, a capillary 5, an evaporator 6, and a gas-liquid separator 7. The working processes of the refrigeration system comprise a compression process, a condensation process, a throttling process and an evaporation process.

The compression process comprises the following steps: when the power line of the refrigerator is inserted and the contact of the temperature controller is connected, the compressor 1 starts to work, the low-temperature and low-pressure refrigerant is sucked by the compressor 1, compressed into high-temperature and high-pressure overheat gas in the cylinder of the compressor 1 and then discharged to the condenser 2; the condensation process is as follows: the high-temperature and high-pressure refrigerant gas radiates heat through the condenser 2, the temperature is continuously reduced, the refrigerant gas is gradually cooled into normal-temperature and high-pressure saturated steam, the saturated steam is further cooled into saturated liquid, the temperature is not reduced any more, the temperature at the moment is called as condensing temperature, and the pressure of the refrigerant in the whole condensing process is almost unchanged; the throttling process is as follows: the condensed refrigerant saturated liquid is filtered by a dry filter 4 to remove moisture and impurities, and then flows into a capillary tube 5, throttling and depressurization are carried out through the capillary tube, and the refrigerant is changed into normal-temperature and low-pressure wet vapor; the evaporation process is as follows: the wet vapor with normal temperature and low pressure starts to absorb heat in the evaporator 6 for vaporization, so that the temperature of the evaporator and the surrounding temperature are reduced, the refrigerant is changed into low-temperature and low-pressure gas, the refrigerant coming out of the evaporator 6 returns to the compressor 1 again after passing through the gas-liquid separator 7, the process is repeated, and the heat in the refrigerator is transferred into the air outside the refrigerator, so that the purpose of refrigeration is realized.

The fan enables air to continuously enter the fins of the evaporator 6 to perform heat exchange, meanwhile, the air cooled after heat release of the evaporator 6 is sent to the refrigerating chamber and the freezing chamber through the air duct, and therefore the air in the storing chamber continuously circulates and flows, and the purpose of reducing the temperature is achieved.

The controller is configured to control the air pump 500 to operate to pump the air in the storage compartment into the air pipe 300 when it is detected that the refrigerator door 200 or the drawer door 104 is in a closed state and a single duration of the closed state is longer than a preset duration;

Acquiring an odor signal detected by the odor detecting device 400;

Based on the odor signal, the freshness of the food in the compartment is obtained.

Referring to fig. 4, fig. 4 is a first workflow diagram of a controller according to an embodiment of the present invention, the controller being configured to perform steps S11 to S16:

s11, judging whether the refrigerator door body or the drawer door body is in a closed state, if so, executing the step S12, and if not, returning to the step S11;

s12, starting to record single duration, and entering step S13;

s13, judging whether the single duration is longer than a preset duration, if so, executing the step S14, and if not, returning to the step S11;

S14, controlling the air pump to work so as to pump the air in the storage room into the air pipe, and entering step S15;

s15, acquiring an odor signal detected by the odor detection device, and entering step S15;

and S16, obtaining the freshness of the food in the storage room based on the smell signal, and ending the process.

Specifically, the single duration is not particularly limited, and the most suitable time may be selected according to the weight and type of food, the frequency of use of the refrigerator at home, and the like, and is usually 30 minutes or more, preferably 60 minutes or more. In addition, since a typical household rarely uses a refrigerator at night, the time of odor detection is set to be in the morning, and the analysis result thereof is displayed in the morning, which is one of preferable examples, for example, at a preset morning time, it is started to detect whether the refrigerator door 200 or the drawer door 104 is in a closed state, and whether a single duration of the closed state is longer than a preset duration.

In an alternative embodiment, the box 100 further defines a compressor compartment for mounting the compressor 1, wherein the compressor compartment is disposed between the box housing 101 and the insulation layer 103;

Then, when the odor detecting device 400 is provided at the side of the heat insulating layer 103 facing the tank case 101, the odor detecting device 400 is provided in the compressor housing, and a portion of the gas pipe 300 is wound around the outer surface of the compressor 1.

For example, as shown in fig. 5, in order to further ensure a sufficient increase in the temperature of the gas in the gas pipe 300, so as not to cause the condensation of the odor detection device 400 and to cause erroneous judgment, the length of the gas pipe 300 outside the heat insulating layer 103 is extended to a predetermined length or more, and the gas pipe is wound around the outer surface of the compressor 1, and by utilizing the characteristic that the compressor 1 is always in a high temperature state, the compressor 1 heats the gas in the gas pipe 300, and the condensation of the detection portion of the odor detection device 400 is avoided. In order to ensure that the gas pipe 300 can be wound around the outer surface of the compressor 1, it is recommended that the length of the gas pipe 300 outside the heat insulating layer 103 be 20cm or more, preferably 40cm or more.

In an alternative embodiment, the controller is further configured to control the operation of the air pump 500 by:

the air pump 500 is periodically controlled to be started until the air pump 500 is detected to stop for a preset number of times, and the air pump 500 is controlled to stop.

Referring to fig. 6, for example, fig. 6 is a second workflow diagram of a controller according to an embodiment of the present invention, the controller is configured to perform steps S141 to S145:

s141, controlling the air pump to start, and entering step S142;

S142, judging whether the starting time of the air pump reaches the preset starting time, if so, executing the step S143, and if not, returning to the step S142;

S143, controlling the air pump to stop, and entering step S144;

S144, judging whether the stopping time of the air pump reaches the preset stopping time, if so, executing the step S145, otherwise, returning to the step S143;

S145, judging whether the stopping times of the air pump are preset times or not, if so, entering step S15, and if not, returning to step S141.

For example, in order to ensure the odor detection accuracy, the air pump 500 is controlled to operate for a preset start-up period to sufficiently pump the air in the storage compartment into the air pipe 300, and then the air pump 500 is controlled to stop operating for a preset stop-up period to sufficiently adsorb the air in the air pipe 300 onto the odor detection device 400, and the above operation is repeated for a preset number of times until the air in the storage compartment is sufficiently transferred to the odor detection device 400 to be detected.

In an alternative embodiment, the obtaining the freshness of the food in the storage compartment based on the odor signal includes:

performing dimension reduction treatment on the odor signal by adopting a principal component analysis method to obtain a first odor component template of the gas in the gas transmission pipe;

Comparing the first odor component template with a plurality of second odor component templates in a preset odor component template library to obtain a comparison result;

And obtaining the freshness of the food in the storage room according to the comparison result.

In an alternative embodiment, the obtaining the freshness of the food in the storage compartment according to the comparison result includes:

When the comparison result shows that the odor signal on the first odor component template falls into a first preset area of the second odor component template, judging that the freshness of the food in the storage compartment is deteriorated;

And when the comparison result shows that the odor signal on the first odor component template falls outside the first preset area of the second odor component template, judging that the freshness of the food in the storage room is fresh.

Referring to fig. 7, fig. 7 is a third workflow diagram of a controller according to an embodiment of the present invention, the controller being configured to perform steps S1611 to S1614:

S1611, performing dimension reduction treatment on the odor signal by adopting a principal component analysis method to obtain a first odor component template of the gas in the gas transmission pipe, and entering step S1612;

s1612, comparing the first odor component template with a plurality of second odor component templates in a preset odor component template library to obtain a comparison result, and entering step 1613 or step 1614;

S1613, when the comparison result shows that the odor signal on the first odor component template falls into a first preset area of the second odor component template, judging that the freshness of the food in the storage compartment is deteriorated;

s1614, when the comparison result shows that the odor signal on the first odor component template falls outside the first preset area of the second odor component template, determining that the freshness of the food in the storage room is fresh.

Illustratively, the first and second scent ingredient templates are embodied in a two-dimensional map; fig. 8 shows an example of judging freshness of food by displaying a pattern of smell of the food in a two-dimensional graph by a principal component analysis method, in which a horizontal axis and a vertical axis are a first principal component axis and a second principal component axis obtained when a multi-dimensional smell signal is converted into two-dimensional data, respectively, the first principal component axis and the second principal component axis being main representative components of deterioration of the food.

In the embodiment of the present invention, a second odor component template is prepared in advance for each odor of foods or a mixed odor of foods, the second odor component template is compared with the second odor component template as a reference, the second odor component template is drawn by a principal component analysis method, the odor signal (o in fig. 8) of the deteriorated foods is drawn on the second odor component template, and a boundary line such as a dotted line in the figure is set in the second odor component template by its distribution, and the second odor component template is divided into two areas, namely, area 1 (within the first preset area) and area 2 (outside the first preset area). In the odor detection, an odor signal of the gas in the storage room to be detected is obtained by the principal component analysis method, a first odor component template is obtained by the principal component analysis method, and when the first odor component template and the second odor component template are compared, deterioration of the food is judged when the odor signal in the storage room to be detected is plotted in the area 1 (· in fig. 8), and freshness of the food is judged when the odor signal in the storage room to be detected is plotted in the area 2 (· in fig. 8).

In an alternative embodiment, the obtaining the freshness of the food in the storage compartment based on the odor signal includes:

performing cluster analysis on the odor signal and a plurality of preset sample odor signals;

when the odor signal after the cluster analysis is positioned in a second preset area of a preset sample cluster analysis result, judging that the freshness of the food in the storage room is deteriorated;

and when the odor signal after the cluster analysis is positioned outside the second preset area, judging that the freshness of the food in the storage room is fresh.

Referring to fig. 9, fig. 9 is a third workflow diagram of a controller according to an embodiment of the present invention, the controller being configured to perform steps S1621 to S1623:

s1621, performing cluster analysis on the smell signal and a plurality of preset sample smell signals, and entering step 1622 or step 1623;

s1622, when the odor signal after the cluster analysis is positioned in a second preset area of the preset sample cluster analysis result, judging that the freshness of the food in the storage room is spoiled;

S1623, when the odor signal after the cluster analysis is located outside the second preset area, determining that the freshness of the food in the storage room is fresh.

Specifically, the sample cluster analysis result is a result obtained by performing cluster analysis on a plurality of sample smell signals. In the embodiment of the invention, the odor signals can be analyzed by a clustering analysis method, and the clustering analysis can generate a clustering analysis result, as shown in fig. 10, in this example, the result is obtained by performing clustering analysis on the odors of 3 fresh bananas and 3 rotten bananas, the data on the left side of a broken line in fig. 10 come from the rotten bananas, when the odor of the gas in the storage room to be detected is detected and the data in fig. 10 is used for performing clustering analysis, if the odor signal of the gas in the storage room to be detected is drawn on the left side (in a second preset area) of the broken line, food deterioration is determined, and if the odor signal of the gas in the storage room to be detected is drawn on the right side (outside the second preset area) of the broken line, food freshness is determined.

Compared with the prior art, the refrigerator provided by the embodiment of the invention has the advantages that the odor detection device 400 is arranged on one side of the heat insulation layer 103 of the refrigerator facing the refrigerator shell 101 or the outer side of the refrigerator shell 101, so that the odor detection device 400 is in a room temperature environment, meanwhile, the conveyed gas is warmed from low temperature to room temperature, the detection part of the odor detection device 400 is difficult to generate condensation, and the odor detection result is ensured; the odor detection device 400 which is used for pumping the gas in the storage room after the refrigerator is closed for a preset duration can be used for detecting the odor, so that the gas can be prevented from diffusing outwards of the refrigerator when the odor detection is performed, the odor detection device 400 has enough sensitivity, the accuracy of the odor detection result is improved, and the error of the food freshness result is avoided.

Referring to fig. 11, fig. 11 is a flowchart of a method for detecting smell of a refrigerator according to an embodiment of the present invention, where the refrigerator includes at least: the refrigerator comprises an air pipe, an air pump arranged on the air pipe, an odor detection device arranged on one side of a heat insulation layer facing to a refrigerator shell of the refrigerator or on the outer side of the refrigerator shell, and a door opening and closing sensor arranged on a refrigerator door body or a drawer door body of the refrigerator; one end of the air pipe is arranged in a storage room of the refrigerator, the other end of the air pipe is connected with the odor detection device, and the refrigerator odor detection method comprises the following steps:

S1, when the refrigerator door body or the drawer door body is detected to be in a closed state, and the single duration time of the closed state is longer than a preset duration time, controlling the air pump to work so as to pump the air in the storage room into the air pipe;

S2, acquiring an odor signal detected by the odor detection device;

and S3, obtaining the freshness of the food in the storage room based on the odor signal.

The embodiment of the invention mainly detects the freshness judgment of fresh foods such as vegetables, fruits, meat, fish and the like, and in this case, the front end of the air pipe is arranged in the fresh-keeping room and/or the refrigerating room so as to detect the freshness of the foods stored in the fresh-keeping room and/or the refrigerating room. The air pump is arranged at any position between the front end of the air pipe and the odor detection device, and can be any position inside the storage room, outside the storage room or outside the heat insulation layer (one side of the heat insulation layer facing the box shell and the outer side of the box shell); the air pump is also connected with the controller, and the controller controls the start of the air pump, so that the air pump pumps the air in the storage room into the air pipe, the rear end of the air pipe connected with the outlet end of the air pump is connected with the suction port of the odor detection device, and the suction port transmits the air pumped into the air pipe by the air pump to the detection part in the odor detection device for detection, and outputs an odor signal. The material, shape and type of air pump of the air pipe are not particularly limited in the embodiment of the present invention, as long as the air pipe can transport the gas, but the material of the air pipe is a metal product such as stainless steel or copper which does not affect the odor component of the gas, or a resistant material such as fluorine resin, and a resin product having solvent property is recommended.

The gas pipe penetrates a part of the heat insulating layer, and is connected to the odor detecting device disposed outside the heat insulating layer (on the side of the heat insulating layer facing the tank case or the outside of the tank case). The odor detection device comprises an odor sensor or an array of odor sensors, and the odor detection device has a plurality of sensor elements, each sensor element outputting a different gas signal for the gas of the storage compartment, the plurality of gas signals forming a pattern of a specific odor for the gas, all the gas signals being sent to a controller for analysis, and further determining the freshness of the food. A transducer such as a crystal of an odor detection device is coated with a polymer film called an induction film, and the polymer film has different adsorption characteristics for different gases. If the oscillator is vibrated at a certain frequency, the odor molecules of the odor are adsorbed to the oscillator, the vibration frequency is changed, and the odor detection device outputs the change of the vibration frequency as a signal.

The refrigerator storage room provided by the embodiment of the invention further comprises a drawer assembly, wherein the drawer assembly comprises a drawer door body, the door opening and closing sensor can be arranged on the drawer door body, and after the storage room is closed for a preset duration, the air in the refrigerator storage room is pumped to the air pipe, so that the concentration of the air transmitted to the odor detection device is ensured. The embodiment of the invention is not particularly limited in the installation position of the door opening and closing sensor, but in the case where a door body or a drawer is provided in each storage compartment, it is preferable that the door body of the storage compartment storing food materials as the object of odor detection is provided; the door opening and closing sensor is connected with the controller and sends the detected opening and closing state of the refrigerator door body or the drawer door body to the controller;

The single duration is not particularly limited in the embodiment of the present invention, and the most suitable time may be selected according to the weight and kind of food, the frequency of use of the refrigerator at home, etc., and is usually 30 minutes or more, preferably 60 minutes or more. In addition, since a typical household rarely uses a refrigerator at night, setting the time of odor detection to the morning, displaying the analysis result thereof in the morning is one of preferred examples, for example, starting to detect whether the refrigerator door or the drawer door is in a closed state at a preset morning time, and whether a single duration of the closed state is longer than a preset duration.

Optionally, the refrigerator body further defines a compressor compartment for mounting a compressor, wherein the compressor compartment is disposed between the refrigerator shell and the heat insulating layer;

when the odor detection device is arranged on one side of the heat insulation layer, which faces the box shell, the odor detection device is arranged in the compressor bin, and a part of the air pipe is wound on the outer surface of the compressor.

For example, in order to further ensure sufficient rise of the gas temperature in the gas pipe, so as to avoid misjudgment caused by condensation of the odor detection device, the length of the gas pipe outside the heat insulation layer is prolonged to be more than a specified length, and the gas pipe is wound on the outer surface of the compressor, and by utilizing the characteristic that the compressor is always in a high temperature state, the compressor heats the gas in the gas pipe, so that condensation of the detection part of the odor detection device is avoided. In order to ensure that the gas pipe can be wound around the outer surface of the compressor, it is recommended that the length of the gas pipe outside the heat insulating layer is 20cm or more, preferably 40cm or more.

Optionally, the refrigerator scent detection method further includes controlling the air pump to operate by:

and periodically controlling the air pump to start until the air pump is detected to stop for a preset number of times.

For example, in order to ensure the odor detection accuracy, the air pump is controlled to operate for a preset starting time period so as to fully pump the air in the storage room into the air pipe, then the air pump is controlled to stop operating for a preset stopping time period so that the air in the air pipe is fully adsorbed on the odor detection device, and the operation is repeated for a preset number of times until the air in the storage room is fully transmitted to the odor detection device for detection.

Optionally, the obtaining the freshness of the food in the storage compartment based on the odor signal includes:

performing dimension reduction treatment on the odor signal by adopting a principal component analysis method to obtain a first odor component template of the gas in the gas transmission pipe;

Comparing the first odor component template with a plurality of second odor component templates in a preset odor component template library to obtain a comparison result;

And obtaining the freshness of the food in the storage room according to the comparison result.

Optionally, the obtaining the freshness of the food in the storage compartment according to the comparison result includes:

When the comparison result shows that the odor signal on the first odor component template falls into a first preset area of the second odor component template, judging that the freshness of the food in the storage compartment is deteriorated;

And when the comparison result shows that the odor signal on the first odor component template falls outside the first preset area of the second odor component template, judging that the freshness of the food in the storage room is fresh.

Illustratively, the first and second scent ingredient templates are embodied in a two-dimensional map; fig. 8 shows an example of judging freshness of food by displaying a pattern of smell of the food in a two-dimensional graph by a principal component analysis method, in which a horizontal axis and a vertical axis are a first principal component axis and a second principal component axis obtained when a multi-dimensional smell signal is converted into two-dimensional data, respectively, the first principal component axis and the second principal component axis being main representative components of deterioration of the food.

In the embodiment of the present invention, a second odor component template is prepared in advance for each odor of foods or a mixed odor of foods, the second odor component template is compared with the second odor component template as a reference, the second odor component template is drawn by a principal component analysis method, the odor signal (o in fig. 8) of the deteriorated foods is drawn on the second odor component template, and a boundary line such as a dotted line in the figure is set in the second odor component template by its distribution, and the second odor component template is divided into two areas, namely, area 1 (within the first preset area) and area 2 (outside the first preset area). In the odor detection, an odor signal of the gas in the storage room to be detected is obtained by the principal component analysis method, a first odor component template is obtained by the principal component analysis method, and when the first odor component template and the second odor component template are compared, deterioration of the food is judged when the odor signal in the storage room to be detected is plotted in the area 1 (· in fig. 8), and freshness of the food is judged when the odor signal in the storage room to be detected is plotted in the area 2 (· in fig. 8).

Optionally, the obtaining the freshness of the food in the storage compartment based on the odor signal includes:

performing cluster analysis on the odor signal and a plurality of preset sample odor signals;

when the odor signal after the cluster analysis is positioned in a second preset area of a preset sample cluster analysis result, judging that the freshness of the food in the storage room is deteriorated;

and when the odor signal after the cluster analysis is positioned outside the second preset area, judging that the freshness of the food in the storage room is fresh.

Specifically, the sample cluster analysis result is a result obtained by performing cluster analysis on a plurality of sample smell signals. In the embodiment of the invention, the odor signals can be analyzed by a clustering analysis method, and the clustering analysis can generate a clustering analysis result, as shown in fig. 10, in this example, the result is obtained by performing clustering analysis on the odors of 3 fresh bananas and 3 rotten bananas, the data on the left side of a broken line in fig. 10 come from the rotten bananas, when the odor of the gas in the storage room to be detected is detected and the data in fig. 10 is used for performing clustering analysis, if the odor signal of the gas in the storage room to be detected is drawn on the left side (in a second preset area) of the broken line, food deterioration is determined, and if the odor signal of the gas in the storage room to be detected is drawn on the right side (outside the second preset area) of the broken line, food freshness is determined.

Compared with the prior art, the odor detection method of the refrigerator provided by the embodiment of the invention has the advantages that the odor detection device is arranged on one side of the heat insulation layer of the refrigerator facing the refrigerator shell or the outer side of the refrigerator shell, so that the odor detection device is in a room temperature environment, meanwhile, the conveyed gas is warmed to the room temperature from low temperature, the detection part of the odor detection device is difficult to generate dew condensation, and the odor detection result is ensured; the odor detection device which is used for pumping the gas in the storage room after the refrigerator is closed for a preset duration is used for odor detection, so that the gas can be prevented from diffusing out of the refrigerator when the odor detection is performed, the odor detection device has enough sensitivity, the accuracy of the odor detection result is improved, and the food freshness result is prevented from being wrong.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims (10)

1. A refrigerator, comprising:

The box body comprises a box shell, a box liner and a heat insulation layer arranged between the box shell and the box liner; wherein the box liner defines a plurality of storage compartments;

the refrigerator door body is arranged at the opening of the refrigerator body;

at least one air pipe with one end set inside the storage room and the other end connected to the odor detecting device; the air pump is also arranged on the air pipe and is used for pumping the air in the storage room into the air pipe;

The odor detection device is arranged on one side of the heat insulation layer facing the box shell or the outer side of the box shell and is used for detecting odor signals of gas in the gas transmission pipe;

The door opening and closing sensor is arranged on the refrigerator door body or the drawer door body in the storage room and is used for detecting the opening and closing state of the refrigerator door body or the drawer door body;

the controller is used for controlling the air pump to work when detecting that the refrigerator door body or the drawer door body is in a closed state and the single duration time of the closed state is longer than the preset duration time so as to pump the air in the storage room into the air pipe;

Acquiring an odor signal detected by the odor detection device;

Based on the odor signal, the freshness of the food in the compartment is obtained.

2. The refrigerator of claim 1, wherein the cabinet further defines a compressor compartment for mounting a compressor, wherein the compressor compartment is disposed between the cabinet housing and the insulation layer;

when the odor detection device is arranged on one side of the heat insulation layer, which faces the box shell, the odor detection device is arranged in the compressor bin, and a part of the air pipe is wound on the outer surface of the compressor.

3. The refrigerator of claim 1, wherein the controller is further configured to control the operation of the air pump by:

and periodically controlling the air pump to start until the air pump is detected to stop for a preset number of times.

4. The refrigerator of claim 1, wherein the deriving freshness of food in the compartment based on the scent signal comprises:

performing dimension reduction treatment on the odor signal by adopting a principal component analysis method to obtain a first odor component template of the gas in the gas transmission pipe;

Comparing the first odor component template with a plurality of second odor component templates in a preset odor component template library to obtain a comparison result;

And obtaining the freshness of the food in the storage room according to the comparison result.

5. The refrigerator of claim 4, wherein said deriving freshness of food in said storage compartment based on said comparison result comprises:

When the comparison result shows that the odor signal on the first odor component template falls into a first preset area of the second odor component template, judging that the freshness of the food in the storage compartment is deteriorated;

And when the comparison result shows that the odor signal on the first odor component template falls outside the first preset area of the second odor component template, judging that the freshness of the food in the storage room is fresh.

6. The refrigerator of claim 1, wherein the deriving freshness of food in the compartment based on the scent signal comprises:

performing cluster analysis on the odor signal and a plurality of preset sample odor signals;

when the odor signal after the cluster analysis is positioned in a second preset area of a preset sample cluster analysis result, judging that the freshness of the food in the storage room is deteriorated;

and when the odor signal after the cluster analysis is positioned outside the second preset area, judging that the freshness of the food in the storage room is fresh.

7. A refrigerator odor detection method, characterized in that the refrigerator comprises at least: at least one air pipe, an air pump arranged on the air pipe, an odor detection device arranged on one side of the heat insulation layer facing the refrigerator shell or on the outer side of the refrigerator shell, and a door opening and closing sensor arranged on the refrigerator door body or the drawer door body of the refrigerator; one end of the air pipe is arranged in a storage room of the refrigerator, the other end of the air pipe is connected with the odor detection device, and the refrigerator odor detection method comprises the following steps:

When the refrigerator door body or the drawer door body is detected to be in a closed state, and the single duration time of the closed state is longer than the preset duration time, controlling the air pump to work so as to pump the air in the storage room into the air pipe;

Acquiring an odor signal detected by the odor detection device;

Based on the odor signal, the freshness of the food in the compartment is obtained.

8. The refrigerator odor detection method as defined in claim 7, wherein said refrigerator cabinet further defines a compressor compartment for mounting a compressor, wherein said compressor compartment is disposed between said cabinet housing and said insulation layer;

when the odor detection device is arranged on one side of the heat insulation layer, which faces the box shell, the odor detection device is arranged in the compressor bin, and a part of the air pipe is wound on the outer surface of the compressor.

9. The refrigerator scent detection method as claimed in claim 7, wherein said deriving freshness of food in said compartment based on said scent signal comprises:

performing dimension reduction treatment on the odor signal by adopting a principal component analysis method to obtain a first odor component template of the gas in the gas transmission pipe;

Comparing the first odor component template with a plurality of second odor component templates in a preset odor component template library to obtain a comparison result;

And obtaining the freshness of the food in the storage room according to the comparison result.

10. The refrigerator scent detection method as claimed in claim 9, wherein said obtaining freshness of food in the storage compartment based on the comparison result comprises:

When the comparison result shows that the odor signal on the first odor component template falls into a first preset area of the second odor component template, judging that the freshness of the food in the storage compartment is deteriorated;

And when the comparison result shows that the odor signal on the first odor component template falls outside the first preset area of the second odor component template, judging that the freshness of the food in the storage room is fresh.