Patent Publication Number: US-9889973-B2

Title: Storage container and refrigerator having the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the priority benefit of the Korean Patent Application No. 10-2014-0110811, filed on Aug. 25, 2014, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
     BACKGROUND 
     1. Field 
     Embodiments of the present disclosure relate to a storage container and a refrigerator having the same, and more particularly, a storage container provided with a sensor unit (sensor), and a refrigerator having the same. 
     2. Description of the Related Art 
     In general, a refrigerator is an apparatus configured to store foods at a lower temperature. The refrigerator includes a freezing compartment in which foods are stored at a relatively lower temperature, and a refrigerating compartment in which foods are stored at a relatively higher temperature. 
     Cool air being supplied to the freezing compartment and the refrigerating compartment may be generated by use of heat-exchanging action of refrigerant. The refrigerant may be able to heat-exchange with respect to air while repeatedly circulating a refrigerant cycle of compression, condensation, expansion, and evaporation. The foods at an inner side the refrigerator may be stored at a desired temperature by supplying the air, having heat-exchanged with respect to the refrigerant, through a circulation fan. 
     The foods stored at an inner side the refrigerator as such may be decomposed or ripen according to characteristics of the each food. Various types of gases may be generated at the time of the ripening or the decomposition of the foods. For example, gases such as acetic acid, aldehyde acid, sulfur compounds, and alcohol may be generated at the time of when Kimchi is being ripe. 
     The degree of decomposition or ripening of the foods may be measured by use of a sensor module configured to measure subject gases, among the various gases that are being generated, that are considered indicators of the decomposition or the ripening of the foods. Therefore, various types of refrigerators having the sensor module are recently under development. However, the sensor module is required to be periodically replaced, and thus difficulty may be present in installing such. 
     SUMMARY 
     Therefore, it is an aspect of the present disclosure to provide a storage container having a sensor unit (sensor) detachably coupled to a storage body and the storage container. 
     It is another aspect of the present disclosure to provide a storage container having a sensor module configured to have colors thereof changed according to the status (condition) of stored foods, and configured to display the changed colors of the sensor module. 
     Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the disclosure. 
     In accordance with one aspect of the present disclosure, a storage container includes a container body, a sensor module, and a coupling member. The container cover may be coupled to the container body. The sensor module may be disposed on at least one of the container body and the container cover. The coupling member may be provided as to accommodate at least a portion of the sensor module, and detachably coupled to the at least one of the container body and the container cover. 
     The coupling member may be rotatably detached from at least one of the container body and the container cover. 
     The coupling member may include a coupling protrusion extending in the shape of a spiral. 
     The at least one of the container body and the container cover may include a guide protrusion configured to guide the coupling protrusion. 
     The at least one of the container body and the container cover may include a concavo-convex container structure such that the coupling member is rotated and then fixed to a predetermined position, and the coupling member may include a concavo-convex coupling structure corresponding to the concavo-convex container structure. 
     The at least one of the container body and the container cover may include a coupling accommodation unit, and the coupling member may include a coupling insertion unit being inserted into the coupling accommodation unit. 
     The coupling insertion unit may include a coupling protrusion extendedly formed in the shape of a spiral, and the coupling accommodation unit may include a guide protrusion configured to guide the coupling protrusion such that the coupling insertion unit is rotated and then inserted into the coupling accommodation unit. 
     A sensor accommodation unit at which the sensor module is accommodated may be provided at an inner side of the coupling insertion unit. 
     The coupling member may include a sensor accommodation unit at which the sensor module is accommodated, and as to protect the sensor module accommodated at the sensor accommodation unit, the coupling member may further include a sensor cover coupled to one side of the sensor accommodation unit. 
     The sensor cover may be coupled to one side of the sensor accommodation unit, such that the sensor module is fixed to the sensor accommodation unit. 
     The sensor module may be detached together with the coupling member from the at least one of the container body and the container cover. 
     A sealing member may be disposed in between the at least one of the container body and the container cover and the coupling member. 
     A food accommodation unit may be formed as the container body and the container cover is coupled with respect to each other; and the coupling member may be coupled to an inner side surface of the at least one of the container body and the container cover such that the sensor module is positioned at the food accommodation unit. 
     The sensor module may be provided such that the colors thereof are changed according to the amount of subject gases, and the sensor module may be provided such that the color changes of the sensor module are displayed at an exterior appearance of the container body and the container cover. 
     At an exterior appearance of the container body and the container cover at which the color changes of the sensor module are displayed, color samples showing the colors of the sensor module that correspond to different status of the foods being accommodated at the food accommodation unit may be provided. 
     In accordance with another aspect of the present disclosure, a storage container includes a container body, a container cover and a sensor unit. The container cover may be coupled to the container body as to form a food accommodation unit. The sensor unit may be provided as to display status of foods being accommodated at the food accommodation unit, and detachably coupled to one side of the container cover. 
     The sensor unit may include a sensor module configured to change colors thereof according to the status of the accommodated foods, and a coupling member provided as to accommodate the sensor module. 
     The sensor unit may be detachably coupled to an inner side surface of the container cover. 
     The sensor unit may be installed at an outer side surface of the container cover as to display the status of the foods accommodated at the food accommodation unit. 
     In accordance with another aspect of the present disclosure, a refrigerator includes a body, a storage compartment, and at least one storage container. The storage compartment may be formed in the body. The at least one storage container may be provided to accommodate food therein, and disposed in the storage compartment, wherein the at least one storage container may include: a sensor module disposed at an inner side of the at least one storage container status of the accommodated foods is measured; and a display unit disposed at an outer side of the at least one storage container such that the status of the foods being measured by the sensor module is displayed. 
     The sensor module may be provided with colors thereof changed according to the status of the accommodated foods. 
     At least a portion of the display unit may be provided in transparent material such that the color changes of the sensor module are displayed at an exterior appearance of the at least one storage container. 
     The refrigerator may further include color samples showing the colors of the sensor module that correspond to different status of the foods being accommodated. 
     The color samples may be adjacently disposed with respect to the display unit. 
     A sensor unit may be detachably coupled to a storage container, and thus a replacement of the sensor unit may be easily conducted. 
     In addition, the sensor unit is capable of providing convenience while disposed at an inner side the storage container as to accurately measure the status of food, and also while configured to display at an exterior appearance of the storage container of the status of the accommodated food. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  is a drawing illustrating a refrigerator in accordance with an embodiment of the present disclosure. 
         FIG. 2  is a drawing illustrating a side cross-sectional view of the refrigerator in accordance with an embodiment of the present disclosure. 
         FIG. 3  is a drawing illustrating a storage container in accordance with an embodiment of the present disclosure. 
         FIG. 4  is a drawing illustrating disassembled container body and container cover of the storage container in accordance with an embodiment of the present disclosure. 
         FIG. 5  is a drawing illustrating the container cover of the storage container in accordance with an embodiment of the present disclosure. 
         FIG. 6  is a drawing illustrating the container cover and a sensor unit of the storage container in accordance with an embodiment of the present disclosure. 
         FIG. 7  is a drawing illustrating the disassembled storage cover and the sensor unit of the storage container in accordance with an embodiment of the present disclosure. 
         FIG. 8  is a drawing illustrating the sensor unit of the storage container in accordance with an embodiment of the present disclosure. 
         FIG. 9  is a drawing illustrating the disassembled sensor unit of the storage container in accordance with an embodiment of the present disclosure. 
         FIG. 10  is a drawing illustrating a sensor module of the storage container in accordance with an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. 
       FIG. 1  is a drawing illustrating a refrigerator in accordance with an embodiment of the present disclosure, and  FIG. 2  is a drawing illustrating a side cross-sectional view of the refrigerator in accordance with an embodiment of the present disclosure. 
     As illustrated on  FIG. 1  and  FIG. 2 , a refrigerator includes a body  10 , and a storage compartment  20  formed at the body  10 . The storage compartment  20  may be provided in a plurality of units such that a front surface thereof is open at an inner side the body  10 . 
     In addition, the refrigerator includes a door  30  rotatably coupled to the body  10  as to open/close the open front surface of the storage compartment  20 , a storage unit  40  configured to be inserted into and withdrawn from by a sliding method while stored at the storage compartment  20 , and a sliding apparatus  50  configured to guide the storage unit  40  to be inserted into and withdrawn from by a sliding method. 
     The body  10  may include an inner case  11  forming the storage compartment  20  and an outer case  13  forming an exterior appearance. Insulation material  15  is foamed in between the inner case  11  and the outer case  13  as to prevent a leak of cool air of the storage compartment  20 . 
     In addition, the body  10  includes a cool air supplying apparatus configured to supply cool air at the storage compartment  20 . The cool air supplying apparatus may include a compressor  61 , a condenser (not shown), an expansion valve (not shown), an evaporator  63 , a draft fan  65 , and a cool air duct  67 . A machinery compartment  29  at which the compressor  61  and the condenser (not shown) configured to compress refrigerant and condense the compressed refrigerant, respectively, are installed is provided at a lower rear side of the body  10 . 
     The evaporator  63 , the draft fan  65 , and the cool air duct  67  are disposed at a rear wall of the storage compartment  20 , and the each of the evaporator  63 , the draft fan  65 , and the cool air duct  67  may be provided in plurality. The evaporator  63  is configured to generate cool air, the draft fan  65  is configured to lead the cool air generated at the evaporator  63  to the storage compartment  20 , and the cool air duct  67  is configured to guide the cool air generated at the evaporator  63  to the storage compartment  20 . 
     The storage compartment  20  is divided in a plurality of units by use of partition walls  17 , and may be vertically and sequentially divided into an upper compartment  21 , a middle compartment  23 , and a lower compartment  25 . The each storage compartment  20  is configured to store foods refrigerated or frozen. In addition, at the each storage compartment  20 , a storage container  100  provided as to accommodate foods may be disposed. The each storage compartment  20  as such will be described later. 
     The upper compartment  21  may be divided in a plurality of units as a plurality of shelves  27  is provided at the upper compartment  21 . The upper compartment  21  may be open/closed by use of the door  30  rotatably coupled to with respect to the body  10 . 
     The middle compartment  23  and the lower compartment  25  each may be open/closed by the storage unit  40  capable of slidingly moving with respect to the body  10 . The storage unit  40  includes a drawer-type door  41 , and an accommodation container  43  mounted at a lower surface of the drawer-type door  41 , and a handle  41   a  a user may grasp may be provided at the drawer-type door  41 . 
     The accommodation container  43  may be provided as to be integrally formed with respect to the drawer-type door  41 , or may be separately manufactured with respect to the drawer-type door  41  as to be coupled to the drawer-type door  41 . 
     The storage unit  40  is inserted into and withdrawn from inner sides the middle compartment  23  and the lower compartment  25  by sliding method by use of the sliding apparatus  50 . The sliding apparatus  50  configured to slidingly move the storage unit  40  is provided with one side thereof coupled to each of the both side surfaces of an inner side the lower compartment  25  at which the storage unit  40  is accommodated, while the other side thereof coupled to each of the both side surfaces of the accommodation container  43  of the storage unit  40 . 
     On the drawing, the other side of the sliding apparatus  50  is illustrated to be coupled to the both side surfaces of the accommodation container  43  of the storage unit  40 . However, the other side of the sliding apparatus  50  may be structured to be coupled to a lower surface of the drawer-type door  41  instead of the both side surfaces of the accommodation container  43 , such that the sliding apparatus  50  may be structured to support the accommodation container  43 . 
     As described above, the storage container  100  is provided as to accommodate foods, and may be disposed at the each storage compartment  20 . The storage container  100  may be provided in a plurality of units, and may be provided in various shapes. Hereinafter, the storage container  100  in accordance with an embodiment of the present disclosure will be described. 
       FIG. 3  is a drawing illustrating a storage container in accordance with an embodiment of the present disclosure, and  FIG. 4  is a drawing illustrating disassembled container body and container cover of the storage container in accordance with an embodiment of the present disclosure. 
     The storage container  100  may include a container body  110 , and a container cover  120  being coupled to the container body  110 . The container body  110  may be provided such that an upper portion thereof is open as to accommodate foods. The container cover  120  may be able to form a food accommodation unit  130  by covering the upper portion of the container cover  110 . 
     As for a user to accommodate foods at the food accommodation unit  130  or to withdraw foods from the food accommodation unit  130 , the container cover  120  may be detachably coupled to the container body  110 . At least one of the container cover  120  and the container body  110  may include a container coupling unit  112  configured to couple the container cover  120  and the container body  110  into each other. 
     As illustrated on  FIG. 4 , the container body  110  includes the plurality of container coupling units  112 . The container coupling unit  112  is rotatably provided at an upper end portion of the container body  110 , and may be coupled to the container cover  120  by use of a hook method. In addition, the container coupling unit  112  may be used as a handle configured to be used for a user to grasp the storage container  100 . 
     The container cover  120  may include a container groove  122  into which at least a portion of the container coupling unit  112  is inserted. The food accommodation unit  130  may be formed, as the container coupling unit  112  is inserted into the container groove  112  and as the container body  110  and the container cover  120  are coupled to each other. 
     The container coupling unit  112  which is described above is provided as one example, and the container body  110  and the container cover  120  may be coupled to in various shapes. As illustrated on  FIG. 3  and  FIG. 4 , a display unit  124  and color samples  126  may be provided at the container cover  120 , and the display unit  124  and the color samples  126  will be described later. 
       FIG. 5  is a drawing illustrating the container cover of the storage container in accordance with an embodiment of the present disclosure.  FIG. 5  is referred to as a drawing illustrating a rear surface of the container cover that is adjacent with respect to the food accommodation unit. 
     The storage container  100  may include a sensor unit (sensor)  140  disposed to at least one of the container body  110  and the container cover  120 . Hereinafter, a case of the sensor unit  140  being disposed at the container cover  120  will be described in detail, and the case may be applied to a case when the sensor unit  140  is disposed at the container body  110  or to a case when the sensor unit  140  is disposed at the container body  110  and the container cover  120 . 
     The sensor unit  140  may be detachably coupled to one side of the container cover  120 . Accordingly, a user may be able to separate and replace the sensor unit  140  from the container cover  120 . 
     The sensor unit  140  may include a sensor module  150  ( FIG. 9 ) and a coupling member (coupler)  160  provided as to accommodate at least a portion of the sensor module  150 . In addition, a sensor cover  180  ( FIG. 8 ) coupled to the coupling member  160  as to protect the sensor module  150 . From  FIG. 4  to  FIG. 8 , the sensor module  150  accommodated at the coupling member  160  is not illustrated. 
     Hereinafter, a coupling of the sensor unit  140  and the container cover  120  will be described in detail. 
       FIG. 6  is a drawing illustrating the container cover and a sensor unit of the storage container in accordance with an embodiment of the present disclosure, and  FIG. 7  is a drawing illustrating the disassembled storage cover and the sensor unit of the storage container in accordance with an embodiment of the present disclosure. 
     As described above, the sensor unit  140  is detachably coupled to the container cover  120 . As illustrated on  FIGS. 5 to 7 , the sensor unit  140  may be able to be coupled to a inner side surface of the container cover  120 . A settling member (a receiving member)  170  into which the sensor unit  140  is coupled may be provided at an inner side surface of the container cover  120 . 
     In detail, the coupling member  160  forming an exterior of the sensor unit  140  is detachably coupled to the settling member  170 . The coupling member  160  and the settling member  170  may be provided in the shapes corresponding with respect to each other. 
     The settling member  170  includes a coupling accommodation unit  172  depressedly formed, and the coupling member  160  may include a coupling insertion unit  162  ( FIG. 8 ) being inserted into the coupling accommodation unit  172 . The coupling insertion unit  162  may be rotatably coupled to or rotatably separated with respect to the coupling accommodation unit  172 . That is, as illustrated on  FIG. 6 , th sensor unit  140  may be rotatably provided at the container cover  120 . 
     The coupling member  160  may include a coupling protrusion  164  extendedly formed in the shape of, for example, a spiral. The coupling protrusion  164  may be formed at an outer side of the coupling insertion unit  162 . The container cover  120  may include a guide protrusion  174  configured to guide the coupling protrusion  164 . The guide protrusion  174  is formed at an inner side of the coupling accommodation unit  172 , and may be skewedly disposed such that the coupling protrusion  164  may be rotatably inserted into. 
     At least a portion of the coupling member  160  may be rotatably inserted into the container cover  120  by use of the coupling protrusion  164  that is rotatably inserted along with the guide protrusion  174 . As for the coupling member  160  to be rotatably fixed to a predetermined position, the container cover  120  and the coupling member  160  may include a concavo-convex container structure  176  and a concavo-convex coupling structure  166 , respectively. 
     As illustrated on  FIG. 7 , the concavo-convex container structure  176  may be formed at an edge of the settling member  170 . The concavo-convex container structure  176  may be provided in the shape of a depressed groove, and the concavo-convex coupling structure  166  may be provided in the shape of a protrusion that corresponds with respect the shape of a depressed groove. 
     Thus, the coupling insertion unit  163  is correspondingly disposed at the coupling accommodation unit  172 , and the coupling protrusion  164  is rotated along the guide protrusion  174 . The coupling member  160  is fixed to the settling member  170  as the concavo-convex coupling structure  166  is inserted into the concavo-convex container structure  176 . 
       FIG. 8  is a drawing illustrating the sensor unit of the storage container in accordance with an embodiment of the present disclosure, and  FIG. 9  is a drawing illustrating the disassembled sensor unit of the storage container in accordance with an embodiment of the present disclosure. 
     As describe above, the coupling member  160  is detachably coupled to the container cover  120 . Accordingly, the sensor module  150  accommodated at the coupling member  160  may be detached from the container cover  120  along with the coupling member  160 . Thus, a replacement and exchange of the sensor module  150  may be easily conducted. 
     As illustrated on  FIG. 9 , the sensor unit  140  may include the coupling member  160 , the sensor module  150 , and a sensor cover  180 . In addition, the sensor unit  140  may include a sealing member (sealer)  190  configured to closely attach the container cover  120  and the sensor unit  140 . 
     In a case when the sensor unit  140  is coupled to the container cover  120 , the sealing member  190  may be disposed in between the container cover  120  and the coupling member  160 . The sealing member  190  may be provided with flexible material such as rubber, and may be able to prevent the smell of foods from being delivered to an outside by reducing the gap in between the coupling member  160  and the container cover  120 . The sealing member  190  may be insertedly coupled to an outer side of the coupling insertion unit  162 . 
     A sensor accommodation unit  168  at which the sensor module  150  is accommodated may be provided at an inner side of the coupling insertion unit  162 . The sensor cover  180  is capable of protecting the sensor module  150  while coupled to one side of the sensor accommodation unit  168 . An insertion of foreign substance into the sensor accommodation unit  168  may be prevented by use of the sensor cover  180 . 
     The sensor cover  180  may include a sensor cover coupling unit (a sensor cover coupler)  182  being inserted into and mounted at an inner side of the sensor accommodation unit  168 . The sensor module  150  may be able to be fixed at the sensor accommodation unit  168  as the sensor cover coupling unit  182  is inserted into an inner side of the sensor accommodation unit  168 . 
     The sensor accommodation unit  168  is provided with a side surface thereof formed by use of the coupling insertion unit  162 , and is provided with one surface thereof formed by use of the sensor cover  180  while the one surface is adjacent with respect to the food accommodation unit  130 . Another one surface of the sensor accommodation unit  168  that is adjacent with respect to the food accommodation unit  130  is provided with an open state, and may be provided with a frame  169  having a predetermined shape. 
     The frame  169  is referred to as a portion being exposed to an exterior in a case when the container cover  120  is separated from the container body  110  by a user, and may be provided in various shapes as to enhance aesthetic appearance. In addition, the frame  169  is capable of protecting the sensor module  150  from making contact with respect to foreign substance. 
     The sensor module  150  is configured to measure the status (condition) of foods being accommodated at the food accommodation unit  130 , and may be provided as to display the status as such. For example, the sensor module  150  may be provided as a gas sensor module configured to measure particular gases. That is, the sensor module  150  is capable of measuring the status of foods by measuring the particular gases. 
     In a case of ripening or decomposition of foods, various types of gases are generated, and the amount and types of the generated gases are affected by the ripening of the foods and also by the seasonings and additional material that are added to the foods. 
     As for the elements of the gases, among the generated gases, that are closely related to the ripening of the foods are volatile organic acid and ammonia. The elements of the gases as such are not detected when foods are in fresh status while the density of the elements of the gases as such is increased in proportion to the degree of ripening as the ripening is proceeded. 
     For example, when Kimchi which is a type of fermented food is ripe, gases such as acetic acid, aldehyde, sulfur compounds, and alcohol are generated. At this time, the gas that is directly involved in the fermentation of the Kimchi is volatile organic acid that is generated as a by-product of micro-organism, for example, the acetic acid. The acetic acid is nearly not generated during an early period of the fermentation of the Kimchi, and is shown with gradual increase as the fermentation is proceeded. 
     Thus, the degree of fermentation of the Kimchi may be determined by measuring the amount of the acetic acid as such. In addition, the degree of ripening or decomposition may be determined from the elements of the gases that are generated in a case of the foods in general other than the fermented foods. 
     In a case of meat, amino acid is increased as protein is decomposed by use of micro-organism during a long-term, low-temperature storage period. During metabolic process, gases such as ammonia, sulfur compounds, aldehyde, and VOC (Volatile Organic Compound) are generated, and the degree of decomposition of the meat may be determined by measuring the amount of the ammonia. 
       FIG. 10  is a drawing illustrating a sensor module of the storage container in accordance with an embodiment of the present disclosure. Referring to  FIG. 10 , the structure and operation principle of the sensor module will be described in detail. 
     The sensor module  150  may include a sensor housing  152  and a solution  154  being filled at an inside the sensor housing  152 . 
     A gas inlet unit (a gas inlet)  156  through which a subject gas to be measured may be formed at one side of the sensor housing  152 . The sensor housing  152  is structured of material having no gas permeability, and glass and various resins may be used. 
     A porous membrane  158  provided such that outside gas elements may be easily inlet while restraining evaporation of electrolyte as much as possible may be provided at the gas inlet unit  156 . 
     The porous membrane  158  is structured of material having gas permeability. For example, most gas-permeable resins having FEP (Fluorinated Ethylene Propylene) film, which is porous PTFE (Poly Tetra Fluoro Ethylene) film may be used. 
     The solution  154  is configured to perform a function of viscous layer of an epithelial tissue of a human body provided as to collect odor molecules in air. The solution  154  is capable of selectively collecting water-soluble gas. 
     As described above, the volatile organic acid gas or the ammonia gas may be used as significant indicators as to determine the degree of fermentation or ripening of foods. Thus, the sensor module  140  may consider the volatile organic acid gas or the ammonia gas as the subject gases. That is, the sensor module may be structured as to measure the density of the volatile organic acid gas or the ammonia gas. 
     The volatile organic acid gas or the ammonia gas are referred to as material having polarizability that are only water-soluble, and are capable of selectively collecting water-soluble molecules such as the volatile organic acid or the ammonia, excluding fat-soluble molecules such as the sulfur compound and the VOC, among various gas elements that are present in outside atmosphere of the sensor module  140 . That is, the solution  154  is capable of performing a role in filtering most of the sulfur compound and the VOC that are generates from foods. 
     The volatile organic acid or the ammonia both are provided to induce density change of hydrogen ion while disassociated at the time of when dissolved in the solution  154 . In a case of carboxylic acid (R—COOH), which is known to be a typical volatile organic acid, is provided to reduce the pH of the solution as hydrogen ion is generated when dissolved, and in a case of the ammonia (NH3), the pH of the solution is increased while hydrogen ion of the solution is reduced when dissolved in the solution. 
     The subject gas may be able to be measured by use of the changes in pH as such. The pH changes of the solution  154  may be measured by use of various methods, and for example, a pH indicator  155  provided with colors thereof changed according to the pH may be added to the solution  154 . 
     Thus, a mixed solution of the solution  154  and the pH indicator  155  may be filled at an inside the sensor housing  152 . The pH indicator  155  is provided with characteristic of changing colors thereof according to the degree of reactions with respect to the hydrogen ion in the solution. 
     For example, as the pH indicator  155 , 3 mM of sodium acetate buffer pH 7.6 having bromothymol blue and methyl red is exposed to the acetic acid. As a result of injecting the acetic acid gas by about 1 cc, as the amount of the acetic acid gas being injected is increased, the colors of the solution are changed to blue yellow, and red. 
     The result, which is obtained from a case of the bromothymol blue being presented with yellow when the pH of the solution is turned to about 6.0 after the bromothymol blue is presented with blue when the pH of the solution is about 7.6, is combined with the result, which is obtained from a case of the methyl red being presented with red when the pH of the solution is turned to about 4.8 after the methyl red is presented with yellow when the pH of the solution is about 6.0. 
     Thus, the inside the sensor housing  152  may be filled by mixing the proper pH indicator  155  with the solution  154  depending on the type of the subject gas being measured. At this time, the mixed solution of the solution  154  and the pH indicator  155  may be present in the state of gas or in the form of gel, and may be fixed at an inside the sensor housing  152  while absorbed to fiber provided at an inside th sensor housing  152 . 
     For example, in a case when the subject gas to be measured is the carboxylic acid, the bromothymol blue reagent in the range of about 0.001 wt % and about 0.1 wt % of the methyl red reagent in the range of about 0.001 wt % and 0.1 wt % may be independently or mixedly used. 
     In detail, in a case when the subject gas to be measured is acetic acid gas of the pKa of about 4.7, according to the example of the experiment above, the bromothymol blue reagent of about 0.02 wt % and the methyl red reagent of about 0.005 wt % are mixed with ethanol of about 10 wt % for reaction, and then dissolved in the solution  154 . The ethanol is being used as to dissolve the pH indicator  155 . 
     Or, in a case when the subject gas to be measured is the ammonia, thymol blue or phenolphthalein in the range of about 0.001 wt % and 0.1 wt % may be used, and in a case when a lower density of the ammonia is to be measured, cresol red or the bromothymol blue having similar density level may be used either independently or mixedly. 
     In detail, in a case when the subject gas to be measured is the ammonia of the pKa of about 9.3, since the pH indicator having the pH 9.3 band is used, the thymol blue provided with color changes in the range of about pH 8.0 and about pH 9.6 may be used. As to measure the thin density of the ammonia under ppm unit, the changes of colors are needed to be present even with a small change in the pH, and thus, in the case as such, the cresol red provided with color changes in the range of about pH 7.0 and about pH 8.8 or the bromothymol blue provided with color changes in the range of about pH 6.0 and about pH 7.6 may be used. 
     When the inside the sensor housing  152  is filled by mixing the proper pH indicator  155  and the solution  154  according to the subject gas, the subject gas that is present at outside atmosphere is introduced into an inside the sensor housing  152  as to induce the pH change of the solution  154 , and according to the pH change, the color of the pH indicator  155  is changed. Thus, by structuring the sensor housing  152  by use of transparent material, a user may be able to determine the density of the subject gas by observing the color change from an outside. 
     The density of the subject gas as such is related to the status of foods, and thus by observing the color changes of the sensor module  150  the status of the accommodated foods may be acknowledged. 
     The sensor module may be positioned at the food accommodation unit  130  as to introduce and measure the density of the subject gas. That is, the sensor module  150  is provided at an inside the storage container  100 , and is coupled to an inner side surface of the container cover  120  while being accommodated at the coupling member  160 . 
     In addition, as for a user to determine the status of the foods by observing the color changes of the sensor module  150 , the sensor module  150  may be provided as to display the color changes of the sensor module  150  at an exterior of the container cover  120 . That is, the sensor unit  140  may be installed as to display the status of the foods accommodated at the food accommodation unit  130  at an outer side surface of the container cover  120 . 
     As described above, the storage container  100  includes the display unit  124 , and the display unit  124  may be disposed at an outer side surface of the container cover  120 . In detail, as for the color changes of the sensor module  150  to be observed from an outer side of the storage container  100 , the display unit  124  may be provided with transparent material. As illustrated on  FIG. 3  and  FIG. 4 , the display unit  124  is provided at an outer side surface of the container cover  120  such that the sensor module  150  is projected through. 
     In addition, the color samples  126  having illustrated with the colors of the sensor module  150  may be provided at an outer side surface of the container cover  120  while the colors correspond with respect to the status of the each food accommodated at the food accommodation unit  130 . The color samples  126  may be adjacently disposed with respect to the display unit  124  such that a user may easily compare the colors of the sensor module  150  with the color samples  126 . 
     As for the color changes of the sensor module  150  to be illustrated at the display unit  124 , at least a portion of the container cover  120 , as well as the sensor cover  180 , may be provided with transparent material. Thus, the sensor unit  140  is detachably coupled to an inner side of the container cover  120 , and may be able to display the status of the foods at an outer side of the container cover  120 . 
     Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.