Patent Publication Number: US-2021172669-A1

Title: Refrigerator

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Patent Application No. PCT/CN2019/096532 with a filing date of Jun. 17, 2020, designating the United States, now pending, and further claims priority to Chinese Patent Application No. 201910756799.X, titled as REFRIGERATOR, filed on Aug. 16, 2019, and Chinese Patent Application No. 201910756811.7 titled as REFRIGERATOR, filed on Aug. 16, 2019, the entire contents of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the field of household appliances and in particular to a refrigerator. 
     BACKGROUND 
     In recent years, people have an increasing requirement for food material preservation along with increasing awareness of health. Refrigerator is the commonest household appliance for preservation of food materials. Therefore, the food material preservation storage becomes a technical need to be met in the field of refrigerators. 
     At present, various manufacturers launch different preservation technologies for food material preservation storage. For example, with vacuum preservation technology, the condition of food spoilage under vacuum takes change. Firstly, in a vacuum environment, it is difficult for microorganisms and various promoting enzymes to survive and the microorganisms will take a long time to grow. Secondly, under vacuum, oxygen in a container will decrease significantly, various chemical reactions cannot be completed, and foods will not be oxidized, so that the foods can be preserved for long. 
     SUMMARY 
     According to a first aspect, the present disclosure provides a refrigerator including a vacuum sealing device disposed at an outer side of a door. The vacuum sealing device includes: 
     a lower support with its upper side provided with a first opening cavity and a sealing ring surrounding the first opening cavity; 
     an upper support with its lower side provided with a second opening cavity corresponding to the first opening cavity and a sealing ring surrounding the second opening cavity; 
     a driving device including a motor and a transmission mechanism, wherein the upper support moves close to or away from the lower support under the drive of the driving device, the transmission mechanism is used to convert a rotational movement of the motor into a rectilinear movement, an output end of the transmission mechanism is connected with the upper support, the upper support moves the sealing ring of the upper support at a first speed to contact with the sealing ring of the lower support, and then moves toward the lower support at a second speed until the sealing ring has a set deformation amount, the first opening cavity and the second opening cavity are butt-jointed to sealingly form a vacuumization region, and the first speed is greater than the second speed; 
     a vacuumization assembly, wherein the vacuumization assembly is in communication with the vacuumization region through a pipe to perform vacuumization or depressurization for the vacuumization region. 
     According to a second aspect, the present disclosure provides a refrigerator including a storage compartment and a door opening or closing the storage compartment. The door is provided with a vacuum sealing device including an upper support, a lower support and a vacuumization assembly. Opening cavities are disposed on mutually-opposed surfaces of the upper support and/or the lower support; sealing rings are disposed around the opening cavities of the upper support and/or the lower support; the upper support may move close to or away from the lower support under the drive of a driving device; when the upper support moves close to the lower support until the upper support and the lower support are butt-joined, the opening cavities sealingly form a vacuumization region through the sealing rings; the vacuumization assembly includes a vacuum pump in communication with the vacuumization region through a pipe; a pressure detection device and a pressure relief device are further disposed on the pipe. The pressure detection device, the pressure relief device and the vacuum pump are in electrical connection with a controller respectively. After the vacuum pump is started, the pressure detection device detects the pressure of the vacuumization region. When determining that abnormal vacuumization is present in the vacuumization region according to a detection signal of the pressure detection device, the controller may control the vacuum pump to stop and start the pressure relief device to perform depressurization for the vacuumization region. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to describe the technical solution of the present disclosure more clearly, the accompanying drawings involved in the examples will be briefly introduced. Apparently, those skilled the art may also obtain other drawings according to these drawings without paying creative work. Further, the accompanying drawings described below can be deemed as illustrative rather than limiting of actual sizes of the products involved in the examples of the present disclosure. 
         FIG. 1  is a structural schematic diagram of a refrigerator according to some examples of the present disclosure. 
         FIG. 2  is a structural schematic diagram of a refrigerating door according to some examples of the present disclosure. 
         FIG. 3  is an exploded view of a refrigerating door according to some examples of the present disclosure. 
         FIG. 4  is a side sectional view of a vacuum sealing device according to some examples of the present disclosure. 
         FIG. 5  is a structural schematic diagram of an upper support of a vacuum sealing device along forward and reverse directions according to some examples of the present disclosure. 
         FIG. 6  is an assembly schematic diagram of an upper support, a driving device and a vacuumization assembly in a vacuum sealing device according to some examples of the present disclosure. 
         FIG. 7  is an exploded view of an upper support, a driving device and a vacuumization assembly in a vacuum sealing device according to some examples of the present disclosure. 
         FIG. 8  is a schematic diagram of connection relationship of an upper support in a vacuum sealing device and a filtering container according to some examples of the present disclosure. 
         FIG. 9  is a schematic diagram of connection relationship of an upper support in a vacuum sealing device and a filtering net according to some examples of the present disclosure. 
         FIG. 10  is an exploded view of an upper support, a heating device and a sealing ring according to some examples of the present disclosure. 
         FIG. 11  is a partial sectional view of connection of an upper support and a heating device according to some examples of the present disclosure. 
         FIG. 12  is a schematic diagram of connection relationship of an upper support in an initial position and a driving device according to some examples of the present disclosure. 
         FIG. 13  is a schematic diagram of connection relationship of an upper support in a descending position and a driving device according to some examples of the present disclosure. 
         FIG. 14A  is a structural schematic diagram of a lower support, a small insulation door and a door in a locked state according to some examples of the present disclosure. 
         FIG. 14B  is a structural schematic diagram of a lower support, a small insulation door and a door in an unlocked state according to some examples of the present disclosure. 
         FIG. 14C  is a structural schematic diagram of dismounting a lower support and a small insulation door from a door according to some examples of the present disclosure. 
         FIG. 15  is a structural schematic diagram of a small insulation door and a lower support in an assembled state along forward and reverse directions according to some examples of the present disclosure. 
         FIG. 16  is an exploded view of a small insulation door, a lower support and a locking hook assembly according to some examples of the present disclosure. 
         FIG. 17  is a structural schematic diagram of mounting a locking hook assembly to the small insulation door according to some examples of the present disclosure. 
         FIG. 18  is a partial sectional view of mounting a locking hook assembly to the small insulation door according to some examples of the present disclosure. 
         FIG. 19  is a perspective diagram of a lower locking hook according to some examples of the present disclosure. 
         FIG. 20  is a structural schematic diagram of an upper locking hook along forward and reverse directions according to some examples of the present disclosure. 
         FIG. 21  is a flowchart of a descending process of an upper support of a vacuum sealing device according to some examples of the present disclosure. 
         FIG. 22  is a flowchart of vacuumization plastic sealing process of a vacuum sealing device according to some examples of the present disclosure. 
         FIG. 23  is a flowchart of air leakage process of a vacuum sealing device and an ascending process of an upper support according to some examples of the present disclosure. 
         FIG. 24A  is a structural schematic diagram of a lower support, a small insulation door and a door in a locked state according to some examples of the present disclosure. 
         FIG. 24B  is a structural schematic diagram of dismounting a lower support and a small insulation door from a door according to some examples of the present disclosure. 
         FIG. 25  is an exploded view of a small insulation door, a lower support and a locking hook assembly according to some examples of the present disclosure. 
         FIG. 26A  is a structural schematic diagram of a lower support, a small insulation door and a door in a locked state according to some examples of the present disclosure. 
         FIG. 26B  is a structural schematic diagram of a small insulation door and a door in unlocked state according to some examples of the present disclosure. 
         FIG. 26C  is a structural schematic diagram of dismounting a lower support and a small insulation door from a door according to some examples of the present disclosure. 
         FIG. 27  is a structural schematic diagram of a refrigerator according to some examples of the present disclosure. 
         FIG. 28  is an exploded view of a refrigerating door according to some examples of the present disclosure. 
         FIG. 29  is a structural schematic diagram of a refrigerator according to some examples of the present disclosure. 
         FIG. 30  is an exploded view of a refrigerating door according to some examples of the present disclosure. 
         FIG. 31  is an exploded view of a lower support according to some examples of the present disclosure. 
         FIG. 32A  is a structural schematic diagram of a lower support and a door in a locked state according to some examples of the present disclosure. 
         FIG. 32B  is a structural schematic diagram of dismounting a lower support from a door according to some examples of the present disclosure. 
         FIG. 33A  is a structural schematic diagram of a lower support and a door in a locked state according to some examples of the present disclosure. 
         FIG. 33B  is a structural schematic diagram of dismounting a lower support from a door according to some examples of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     The technical solution of the present disclosure will be fully and clearly described below in combination with the accompanying drawings of the examples of the present disclosure. Apparently, the described examples are merely some of the present disclosure rather than all examples. All other examples obtained by those skilled in the art based on these examples of the present disclosure without paying creative work shall fall with the scope of protection of the present disclosure. 
     In the descriptions of the present disclosure, the terms “one example” “some examples”, “illustrative examples” “examples” “specific examples” or “some embodiments” are all intended to indicate a specific feature, structure, material, or property relating to these examples or embodiments is included in at least one example or embodiment of the present disclosure. The illustrative expressions of the above terms do not necessarily refer to the same example or embodiment. In addition, the specific feature, structure, material or property may be included in any one or more examples or embodiments in a proper manner. 
     In the description of the present disclosure, it is to be understood that orientations or positional relationships indicated by terms such as “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inside”, “outside”, are based on orientations or positional relationships shown in the drawings and are used only for convenience and simplification of descriptions of the present disclosure, rather than indicate or imply that the indicated apparatus or element shall have a specific orientation and be configured or operated in a specific orientation. Thus, the terms shall not be understood as limiting of the present disclosure. In addition, the terms “first”, “second” and “third” are used only for descriptions and shall not be understood as indicating or implying relative importance. 
     In the descriptions of the present disclosure, it is noted that the terms “mounting” “connection” and “coupling” shall be understood in a broad sense, for example, it may be a fixed connection, or a detachable connection, or integrated connection; or direct connection or an indirect connection through an intermediate medium, or may be internal communication between two elements. Those skilled in the art may understand the specific meanings of the above terms in the present disclosure according to the specific situations. 
     In addition, the technical features involved in the different examples described below may be combined with each other as long as they do not constitute conflict. 
       FIG. 1  is a structural schematic diagram of a refrigerator according to some examples of the present disclosure. As shown in  FIG. 1 , the refrigerator  1  has an approximate cuboid shape and its external appearance is defined by a storage compartment  100  defining a storage space and a plurality of doors  200  disposed in the storage compartment  100 .  FIG. 2  is a structural schematic diagram of a refrigerating door according to some examples of the present disclosure. The door  200  includes a door housing  210  at an outer side of the storage compartment  100 , an door inner liner  220  at an inner side of the storage compartment  100 , an upper end cover  230 , a lower end cover  240 , and an insulation layer disposed among the door housing  210 , the door inner liner  220 , the upper end cover  230  and the lower end cover  240 . Generally, the insulation layer is formed by filling with foaming material. 
     The storage compartment  100  includes a box with opening. The storage compartment  100  is vertically divided into a lower freezing compartment  100 A and an upper refrigerating compartment  100 B. Each of the partitioned spaces may have an independent storage space. Specifically, the freezing compartment  100 A is at the lower part of the storage compartment  100  and may be selectively covered by a drawer-type freezing compartment door A. The space above the freezing compartment  100 A is divided into a left side and a right side to form the refrigerating compartment  100 B respectively. The refrigerating compartment  100 B may be selectively closed or opened by a refrigerating door  200 B pivotably mounted on the refrigerating compartment  100 B. 
       FIG. 3  is an exploded view of a refrigerating door according to some examples of the present disclosure.  FIG. 4  is a side sectional view of a vacuum sealing device according to some examples of the present disclosure. As shown in  FIGS. 3 and 4 , a vacuum sealing device  300  is provided on the door  200  of the refrigerator to perform vacuumization and plastic sealing for storage bags. The vacuum sealing device  300  may be disposed on a freezing door  200 A or may be disposed on a refrigerating door  200 B. Because the refrigerating door  200 B is located above, the vacuum sealing device  300  is generally preferably disposed on the refrigerating door  200 B so as to meet the use habit of users. 
       FIG. 4  is a side sectional view of a vacuum sealing device according to some examples of the present disclosure.  FIG. 5  is a structural schematic diagram of an upper support of a vacuum sealing device along forward and reverse directions according to some examples of the present disclosure.  FIG. 6  is an assembly schematic diagram of an upper support, a driving device and a vacuumization assembly in a vacuum sealing device according to some examples of the present disclosure.  FIG. 7  is an exploded view of an upper support, a driving device and a vacuumization assembly in a vacuum sealing device according to some examples of the present disclosure.  FIG. 8  is a schematic diagram of connection relationship of an upper support in a vacuum sealing device and a filtering container according to some examples of the present disclosure.  FIG. 9  is a schematic diagram of connection relationship of an upper support in a vacuum sealing device and a filtering net according to some examples of the present disclosure.  FIG. 10  is an exploded view of an upper support, a heating device and a sealing ring according to some examples of the present disclosure.  FIG. 11  is a partial sectional view of connection of an upper support and a heating device according to some examples of the present disclosure.  FIG. 12  is a schematic diagram of connection relationship of an upper support in an initial position and a driving device according to some examples of the present disclosure.  FIG. 13  is a schematic diagram of connection relationship of an upper support in a descending position and a driving device according to some examples of the present disclosure.  FIG. 14A  is a structural schematic diagram of a lower support, a small insulation door and a door in a locked state according to some examples of the present disclosure.  FIG. 14B  is a structural schematic diagram of a lower support, a small insulation door and a door in an unlocked state according to some examples of the present disclosure.  FIG. 14C  is a structural schematic diagram of dismounting a lower support and a small insulation door from a door according to some examples of the present disclosure.  FIG. 15  is a structural schematic diagram of a small insulation door and a lower support in an assembled state along forward and reverse directions according to some examples of the present disclosure.  FIG. 16  is an exploded view of a small insulation door, a lower support and a locking hook assembly according to some examples of the present disclosure.  FIG. 17  is a structural schematic diagram of mounting a locking hook assembly to the small insulation door according to some examples of the present disclosure. 
       FIGS. 4-17  illustrate an example of the vacuum sealing device  300  according to some examples of the present disclosure. As shown in  FIG. 4 , the vacuum sealing device  300  includes a lower support  310 , provided with a first opening cavity  311 ; and an upper support  320  provided with a second opening cavity  321 . The upper support  320  may be moved close to or away from the lower support  310  under the drive of a driving device  340 . After the upper support  320  moves close to the lower support  310  to be in place, the first opening cavity  311  and the second opening cavity  321  are butt-joined and sealed up to form a vacuumization region  301 . The above vacuum sealing device  300  locks and unlocks the lower support  310  and the upper support  320  by controlling automatic ascent and descent of the driving device  340 , thereby realizing automatic vacuum sealing and improving the degree of intelligence of the refrigerator. 
     In some examples, as shown in  FIG. 4 , in order to improve the sealing of the vacuumization region  301 , sealing portions for sealing the vacuumization region  301  are disposed on the opposing surfaces of the lower support  310  and the upper support  320 . Specifically, a first sealing groove  313  is disposed on the periphery of the first opening cavity  311  of the lower support  310  and a second sealing groove  323  is disposed on the periphery of the second opening cavity  321  of the upper support  320 . The first sealing groove  313  and the second sealing groove  323  are opposed in position and internally provided with a sealing ring  350  respectively. The two sealing rings  350  of the first sealing groove  313  and the second sealing groove  323  seal the vacuumization region  301  inside, realizing reliable sealing of the vacuumization region  301 . 
     In some examples, as shown in  FIG. 5 , the first opening cavity  311  or the second opening cavity  321  is internally provided with a limiting portion to limit an inserting position of a storage bag inserted into the vacuumization region  301 , thereby preventing an opening position of the storage bag protruding out of the vacuumization region  301 . Specifically, the limiting portion is a limiting rib  322  disposed in the first opening cavity  311  or the second opening cavity  321 , a height of the limiting rib  322  is greater than a depth of the first opening cavity  311  or the second opening cavity  321 , and a length of the limiting rib  322  is slightly lower than that of the first opening cavity  311  or the second opening cavity  321 . When the user inserts the storage bag into the vacuumization region  301 , the limiting rib  322  may block the storage bag from being further inserted inwardly. In other examples, an in-place detection device may also be disposed on the vacuumization region  301 . Specifically, a microwave sensor or an infrared sensor may be adopted to detect the presence and absence of the storage bag inserted into the vacuumization region  301 , further send a signal indicating whether the storage bag is in place to a controller. The controller may control the vacuum pump to start according to the in-place signal. By disposing the in-place detection device, whether the storage bag is in place is detected automatically and the controller further automatically controls the vacuum pump to be switched on and off. 
     In some examples, the vacuum sealing device  300  further includes a vacuumization assembly  330 . As shown in  FIGS. 6 and 7 , the vacuumization assembly  330  includes a vacuum pump  331  communicating with the vacuumization region  301  through a pipe  335 . Further, a pressure detection device  332  and a pressure relief device  333  are disposed on the pipe  335 . The pressure detection device  332  is specifically a pressure sensor for detecting a pressure of the vacuumization region  301 , and the pressure relief device  333  is specifically an electric pressure relief valve for releasing the pressure of the vacuumization region  301  when the valve is opened. When a user performs vacuumization sealing, the vacuum pump  331  is started to perform vacuumization treatment for the vacuumization region  301 . When the pressure detection device  332  detects that the pressure of the vacuumization region  301  reaches a set negative pressure value, the controller controls the vacuum pump  331  to stop. The vacuum degree of the vacuumization region  301  can be controlled by disposing the pressure sensor, and the vacuum pump  331  can be switched on and off based on the detection value of the pressure sensor, thereby guaranteeing the vacuumization effect. After the vacuumization and sealing operations are completed, the above electric pressure relief valve may be started to automatically control the pressure relief of the vacuumization region  301 , thereby facilitating taking out the storage bag by users. In order to prevent foreign matters in the vacuumization region  301  entering the vacuum pump  331  through the pipe  335 , a filtering protection device is also disposed on the pipe  335 . In an example, as shown in  FIG. 8 , the filtering protection device is specifically a filtering container  334  series-connected with the pipe  335 . An inlet and an outlet are disposed on an upper end of the filtering container  334 , the inlet is in communication with the vacuumization region  301  through the pipe and the outlet is in communication with the vacuum pump  331  through the pipe. The foreign matters in the vacuumization region  301  enter the filtering container  334  through the pipe  335  and are trapped at the bottom of the filtering container  334 , avoiding entry of the foreign matters into the vacuum pump  331 . In order to clean the filtering container  334  easily, the filtering container  334  specifically includes a tank body with an opening and an upper cover detachably connected to the tank body. The inlet and the outlet are disposed on the upper cover. During cleaning, the tank body may be dismounted, thereby avoiding the problem of poor sealing of the pipe  335  caused by frequent mounting and dismounting of the pipe  335 . 
     In another example, as shown in  FIG. 9 , the filtering protection device is a filtering net  336  disposed on the pipe  335 . Specifically, for ease of mounting and dismounting, the filtering net  336  is disposed at a vent  324  at the connection position of the upper support  320  and the pipe  335 . The user may perform mounting/dismounting or cleaning for the filtering net  336  from the lower side by moving the upper support  320  to a highest position. 
     One connection hole of the vacuumization region  301  connecting with the pipe  335  may be disposed. Of course, in order to prevent vacuumization failure caused by plugging of the connection hole by the foreign matters in the vacuumization region  301  in a case of single connection hole, two or more connection holes may be disposed to connect with the pipe  335  respectively. The pipes  335  are parallel-disposed to connect with a main pipe through a three-way or multi-way connector. The pressure sensor and the electronic pressure relief valve are disposed on the main pipe. 
     As shown in  FIG. 4 , the vacuum sealing device  300  further includes a sealing zone  302  at an outer side of the vacuumization region  301 . The sealing zone  302  is used to perform plastic sealing treatment for the storage bag after vacuumization. The sealing zone  302  is internally provided with an insulation cushion  360  and a heating device  370  mutually opposed. Specifically, the heating device  370  is mounted in a groove of a lower surface of the upper support  320 . The insulation cushions  360  are mounted in grooves of upper surfaces of the upper support  320  and the lower support  310 . When the upper support  320  moves to form the sealed vacuumization region  301  with the lower support  310 , the insulation cushion  360  in the sealing zone  302  abuts against the heating device  370 . After vacuumization is completed, the storage bag may be quickly sealed by the heating device  370  in the sealing zone  302 . After the heating device  370  works for a set time length, the driving device  340  is controlled to drive the upper support  320  to move upward so that the user may pull out the storage bag to complete the plastic sealing. 
     More specifically, as shown in  FIGS. 10 and 11 , the heating device  370  includes a heating wire  371 . A heat conducting plate  373  is disposed at a lower side of the heating wire  371  to expand the heating area of the heating wire  371  so that the plastic sealing area of the storage bag is expanded to realize tight sealing. The heating wire  371  extends along a length direction of the upper support  320  and bends upward at both sides of the upper support  320 . The free end of the heating wire  371  extending to an upper side of the upper support  320  is fixed at the upper support  320  through an insulation plate  372 . Specifically, the insulation plate  372  is made of insulation material and shaped into a bending plate wrapped around the heating wire  371 , thereby avoiding external exposure of the heating wire  371 . Further, the two free ends of the heating wire  371  are connected, through a spring  375 , to two conducting wires leading from a connection terminal  374 . With the spring  375 , the heating wire  371  can be always maintained in tensioned state so that the heating wire  371  has a higher flatness. The heat conducting plate  373  at the lower side of the heating wire  371  is in close contact with the storage bag. Thus, the problem of loose contact and incomplete sealing at a particular position due to non-flatness of the heating wire  371  is avoided. 
     In the above vacuum sealing device, the driving device  340  may be an electric driving device or an air pressure driving device. Because of large occupation space of the air pressure driving device, the electric driving device is adopted as the driving device  340  in this example. Specifically, as shown in  FIGS. 7, 12 and 13 , the driving device  340  includes a motor  341  and a transmission mechanism. The transmission mechanism is used to convert a rotational movement of the motor into a rectilinear movement, and an output end of the transmission mechanism is connected with the upper support. The transmission mechanism includes a first gear  342  fixedly connected to an output shaft of the motor and a second gear  343  meshed with the first gear  342 , a third gear  344  fixedly connected with the second gear  343  and an output rack  345  meshed with the third gear  344 . A pin hole is disposed at a lower side of the output rack  345 , and the upper support  320  and the output rack  345  are connected through a pin shaft  346  inserted into the pin hole. Through the transmission mechanism, the rotation of the motor  341  is converted into up and down movement of the upper support  320 . 
     In some examples, as shown in  FIG. 7 , a connection plate  347  is disposed between the upper support  320  and the driving device  340 . The connection plate  347  is thread-connected with the upper support  320 , and a guide groove  3471  is formed on the connection plate  347 . A lower end of the output rack  345  is plugged into the guide groove  3471 , and an elongated pin hole is disposed at the guide groove  3471  and the lower end of the output rack  345  respectively. The pin shaft  346  is inserted through the pin holes of the guide groove  3471  and the output rack  345 . When the pin shaft  346  is at the lowest end of the pin hole, there is a clearance between a lower end surface of the output rack  345  and a groove bottom of the guide groove  3471  and an elastomer  348  is disposed in the clearance. 
     As shown in  FIG. 12 , at an initial position, the upper support  320  is at the highest position. During a pressing stage, as shown in  FIG. 13 , the driving device  340  brings the upper support  320  to move down. In order to ensure tight mating of the lower support  310  and the upper support  320 , a set rotation stroke of the motor is generally taken as an in-place determination signal. Thus, by disposing the elastomer  348  between the output rack  345  and the guide groove  3471 , the upper support  320  is enabled to move downward to be in contact with the lower support  310  and then the output rack  345  can continue moving a distance downwardly. Thus, the elastomer  348  is compressed to prevent stalling of the motor, thereby providing protection for the motor  341  and maintaining the pressing force stable. 
     During a vacuumization stage, a sealed vacuumization region  301  is formed between the lower support  310  and the upper support  320 , and the upper support  320  moves downward under the action of atmospheric pressure due to decrease of air pressure. At this time, due to existence of the elongated pin hole, the output rack  345  keeps stationary when the upper support  320  moves downward, thereby providing protection for the entire driving device  340 . 
     In order to accurately control the movement of the upper support  320  and further determine whether the upper support  320  moves to be in place, the vacuumization region  301  is enabled to form a sealed space. In an example, the motor  341  is a stepping motor  341  and whether the upper support  320  moves to be in place can be determined by detecting the rotational stroke of the stepping motor  341 . In another example, a microswitch is disposed at the lower support  310  or the upper support  320 . After the upper support  320  moves to be in place and then triggers the microswitch, the controller controls the driving device  340  to be stopped and locked at a current position according to a feedback signal of the microswitch. One driving device  340  may be disposed. The output gear is located in a middle region of the upper support  320 . In this case, it causes an edge area of the upper support  320  and the lower support  310  to be loosely attached, resulting in air leakage of the vacuumization region  301 . Thus, in order to provide sealing of the vacuumization region  301 , the driving devices  340  are symmetrically disposed at both sides of the upper support  320 . Correspondingly, one connection plate  347  is disposed, two guide grooves  3471  are disposed on the connection plate  347 , and two output racks  345  protrude into the guide grooves  3471  respectively. 
     Specifically, as shown in  FIGS. 6 and 7 , the driving device  340  and the vacuumization assembly  330  are both mounted on a mounting base  305  at the upper side of the upper support  320 . A vent  324  is disposed at the upper support  320  to communicate with the vacuumization assembly  330 . Three cavities are disposed at a side of the mounting base  305 , and the cavities include a vacuum pump mounting cavity  3051  at the middle position, and driving device mounting cavities  3052  at right and left sides. In order to guarantee entire aesthetics of external surface of the door  200  of the refrigerator and ease of application of the vacuum sealing device  300 , as shown in  FIG. 3 , a mounting cavity  211  recessed inwardly is disposed on the door housing  210 . The driving device  340  is connected with the upper support  320  and then connected to the mounting base  305  through a screw. The vacuumization assembly  330  is connected with the vent  324  on the upper support  320  and then mounted to the mounting base  305 . In this way, one assembly is formed and then entirely mounted into the mounting cavity  211  by inserting a screw through two support lugs at both sides of the mounting base  305 . Thus, modularized assembly is realized for various parts with no part exposed out of the external surface, realizing good entirety of the device. 
     When the user performs plastic sealing for a storage bag, especially powder-like foods such as flour or liquid or the like by use of the vacuum sealing device  300 , the powder or liquid may enter the vacuumization region  301  during vacuumization and finally accumulate in the first opening cavity  311  of the lower support  310 . Therefore, in order to help the user to clean the food residues in the lower support  310 , the lower support  310  is detachably mounted relative to the door  200 . 
     The lower support  310  may be mounted on the door  200  in several manners. In this example, as shown in  FIGS. 14A-14C , the lower support  310  may be detachably mounted on the door  200  from an inner side of the door  200  (i.e. a side with an inner liner). Because the heat insulation of the door  200  of the refrigerator must be ensured, a small insulation door  250  is disposed at an inner side portion of the lower support  310  facing the storage compartment  100 . As shown in  FIG. 14C , a mounting hole  201  communicating inside with outside is disposed on the door  200 , and the lower support  310  and the small insulation door  250  are inserted into the mounting hole  201  from the inner side of the door  200 , thereby realizing dismounting cleaning of the lower support  310  and insulation performance of the door  200  at the same time. 
     In an example, as shown in  FIG. 15 , the lower support  310  and the small insulation door are integrally formed. As shown in  FIGS. 16 and 17 , the lower support  310  and the small insulation door  250  are formed by a first housing  251  and a second housing  252  with opening cavity structures and an insulation piece disposed between the first housing  251  and the second housing  252 . The first housing  251  and the second housing  252  are snap-fitted. The first housing  251  is provided with an extension arm  2511  along a direction away from the second housing  252 , and the lower support  310  is formed on the extension arm  2511 . The first opening cavity  311  is an open groove formed on an upper side of the extension arm  2511 , and a first sealing groove  313  is formed on the periphery of the open groove. 
     In order to further ensure the insulation performance of the door  200  and avoid cold leakage occurring from a clearance between the mounting hole  201  and the small insulation door  250 , as shown in  FIGS. 16 and 17 , a small door gasket  253  is disposed between the small insulation door  250  and the door inner liner  220 . Specifically, a support arm  2512  is disposed at the position of the first housing  251  mated with the door inner liner  220  where the size of the support arm  2512  is greater than that of the mounting hole  201 . A mounting groove surrounding the mounting hole  201  is disposed on the support arm  2512 , and the small door gasket  253  is mounted in the mounting groove. 
     Specifically, in order to guarantee the small insulation door  250  is reliably fixed on the door  200 , a locking device  400  disposed between the small insulation door  250  and the door inner liner  220 . The locking device  400  is used to lock or unlock the small insulation door  250  on or from the door  200 . 
     As shown in  FIGS. 14A-14C, 16 and 17 , the locking device  400  includes a locking hook assembly disposed on the small insulation door  250  and a locking groove  221  disposed on the door inner liner  220 . The locking hook assembly includes a locking hook inserted through the small insulation door  250 . The locking hook may switch between a first position and a second position. When switching to the first position, the locking hook may be mated with the locking groove  221  to realize the locking of the small insulation door  250  and when switching to the second position, may be separated from the locking groove  221  to realize unlocking of the small insulation door  250 . 
     Specifically, in order to improve the reliability of the locking device  400 , two locking grooves  221  and two locking hooks are disposed respectively. The locking grooves  221  are located at upper and lower sides of the mounting hole  201 . As shown in  FIGS. 15-20 , the locking hook assembly includes an upper locking hook  420  and a lower locking hook  410  and a reset spring  430 . As shown in  FIG. 19 , the lower locking hook  410  includes a hooking portion  414  mated with the locking groove  221  at the lower side, a hinging portion  412  rotatably connected with the small insulation door  250  and a handle portion  411  at the lower side of the small insulation door  250 . The handle portion  411  and the hooking portion  414  are located at both sides of the hinging portion  412  respectively. The lower locking hook  410  further includes a lower connection portion  413  connecting with the upper locking hook  420 , where the lower connection portion  413  extends above the handle portion  411 . Specifically, an end of the lower connection portion  413  is formed into a T-shaped protrusion  4131 . As shown in  FIG. 20 , the upper locking hook  420  includes a hooking portion  421  mated with the locking groove  221  at the upper side and an upper connection portion  423  connecting with the lower locking hook  410 . Specifically, a lower end of the upper connection portion  423  is formed into an open groove structure  4231 . The T-shaped protrusion  4131  is inserted into the open groove  4231  to realize connection of the upper locking hook  420  and the lower locking hook  410 . The reset spring  430  is disposed between the upper locking hook  420  and an upper end surface of the small insulation door  250 . More specifically, a connection shaft  422  is formed on the upper locking hook  420  and the reset spring  430  is sleeved on the connection shaft  422 . 
     As shown in  FIG. 17 , a guide positioning portion is formed on an inner surface of the second housing  252 , and the upper connection portion  423  is fitted on the guide positioning portion. The upper locking hook  420  may slide along the guide positioning portion. Specifically, the guide positioning portion is a snapping hook  2521  formed on the inner surface of the second housing  252 . The snapping hooks  2521  are located at left and right sides of the upper connection portion  423  and extend a distance up and down, and the upper connection portion  423  is fitted between the two snapping hooks  2521 . 
     In an initial state, the upper locking hook  420  and the lower locking hook  410  are in the first position under the elastic force of the reset spring  430  to realize the locking of the small insulation door  250  and the door inner liner  220 . When the user moves the lower locking hook  410  by hand, the lower locking hook  410  rotates around the hinging portion  412 , the hooking portion  414  moves downward to separate from the locking groove  221  at the lower side, and at the same time, the connection portion push up the upper locking hook  420  to move upward so that the upper locking hook  420  separates from the locking groove  221  at the upper side. In this way, the upper locking hook  420  and the lower locking hook  410  are in the second position to realize the unlocking of the small insulation door  250  and the door inner liner  220 . 
     In order to ensure the external aesthetics of the door  200  of refrigerator, as shown in  FIGS. 1 and 2 , a bar table door  260  is disposed in the region of the refrigerator door  200  where the vacuum sealing device  300  is located. A lower end of the bar table door  260  is hinged with the door  200  and the bar table door  260  can be flipped to the position where it is perpendicular to the surface of the door housing  210 . An upper end of the bar table door  260  is connected with the door housing  210  through a first push ejection switch  212 . With the disposal of the bar table door  260  structure, in the state of the bar table door  260  being opened, the storage bag holding foods can be put on the bar table door  260  and then is subjected to vacuum sealing treatment, thereby facilitation operation of users. When the bar table door  260  is closed, the external aesthetics of door  200  can be ensured. 
     The inner side of the bar table door  260  further includes an operation panel  270  covered on the outer side of the mounting cavity. An inserting hole  271  is formed on the operation panel  270 , and a lower surface of the inserting hole  271  is flushed with an upper surface of the first opening cavity  311 . In this case, the vacuum sealing device  300  can be entirely hidden at the rear side of the operation panel  270 . When performing vacuum plastic sealing, the user may directly insert the opening of the storage bag from the inserting hole  271  of the operation panel  270 , and directly extend it to the upper surface of the first opening cavity  311 . When the upper support  320  moves downward, the opening of the storage bag can be placed in the vacuumization region  301 . Specifically, the operation panel  270  is detachably connected to the door housing  210 . A display control device  272  is further disposed on the operation panel  270 . The display control device  272  includes an indicating device for displaying a working state of the vacuum sealing device  300  and a control button for controlling the vacuum sealing device  300  to stop or start. The user may determine whether to pull out the storage bag according to the working state of the vacuum sealing device  300  indicated by the display control device  272 . The display control device  272  includes “vacuumization plastic sealing” button, “opening sealing” button, “manual vacuumization” button, and “stop” button. Vacuumization and plastic sealing process can be realized by depressing the button “vacuumization plastic sealing”, sealing operation can be realized for individual storage bag by depressing the button “opening sealing”, and manual vacuumization treatment can be realized by depressing the button “manual vacuumization”. For example, the “manual vaccumization” button may be set to perform automatic vacuumization for several seconds for one depress and then continue vacuumization for a second depress and repeat like this until the user thinks the vacuumization is completed. Alternatively, the user keeps depressing the “manual vacuumization” button to perform continuous vacuumization until the user stops depressing the “manual vacuumization” button. In this way, the user realizes the manual vacuumization. By depressing the “stop” button, the flow of air release and upper support ascent is performed. When the user determines that the vacuum sealing device works abnormally during the vacuumization process, the user may terminate the flow of the vacuumization in advance by depressing “stop” button. 
     The above vacuum sealing device performs vacuumization sealing in the following procedure including upper support descent, vacuumization plastic sealing, air release, and upper support ascent. 
     As shown in  FIG. 21 , the specific flow of the descent of the upper support  320  includes following steps: 
     At step  101 , the upper support  320  performs first-stage descent at a first speed. 
     At step  102 , whether the upper support  320  descends a first preset distance is determined. If yes, step  103  is performed, otherwise, step  101  is performed. 
     The upper support  320  descends the first preset distance at the first speed until the sealing ring of the upper support  320  is in contact with the sealing ring of the lower support  310 ; the upper support  320  quickly descends toward the lower support  310  at the higher first speed so that the vacuumization sealing process will take a shorter time. 
     At step  103 , the upper support  320  performs second-stage descent at a second speed. 
     At step  104 , whether the upper support  320  descends a second preset distance is determined. If yes, step  105  is performed, and otherwise, the step  103  is performed. The second speed is lower than the first speed. 
     When the upper support  320  descends the second preset distance, the sealing rings of the upper support  320  and the lower support  310  deform to a preset value, and the preset value is big enough to seal the vacuumization region; the upper support  320  moves toward the lower support  310  at the second speed under the drive of the driving device, which is a slow descending stage where the driving device increases its acting force with its speed decreased to ensure the sealing of the upper support  320  and the lower support  310 . 
     When it is determined that the upper support  320  descends the first preset distance, the flow of vacuumization plastic sealing shown in  FIG. 22  is started. The flow of vacuumization plastic sealing includes the following steps. 
     At step  201 , the vacuum pump is started. 
     At step  202 , whether the pressure value of the vacuumization region  301  reaches a first pressure value is determined. If yes, step  207  is performed, and otherwise, step  203  is performed. 
     The pressure detection device may determine whether the pressure value of the vacuumization region  301  reaches the first pressure value. When it is determined the first pressure value is reached, the vacuumization of the vacuum pump  331  is stopped. 
     At step  203 , whether a vacuumization time reaches a preset vacuumization time is determined. If yes, step  207  is performed, and otherwise step  204  is performed. 
     Whether the vacuumization time reaches the preset vacuumization time is determined. When the preset vacuumization time is reached, the vacuumization of the vacuum pump  331  may also be stopped. 
     At step  204 , whether the pressure value of the vacuumization region  301  reaches a second pressure value is determined, where the second pressure value is smaller than the first pressure value; if yes, step  205  is performed and otherwise step  202  is performed. 
     At step  205 , whether the change of the pressure value of the vacuumization region  301  is smaller than a third pressure value after a preset time is determined, where the third pressure value is smaller than the second pressure value; if yes, step  206  is performed and otherwise step  202  is performed. 
     When the pressure detection device detects that the pressure value of the vacuumization region  301  reaches the second pressure value and the change of the pressure value is smaller than the third pressure value after a preset time, it is determined the vacuumization process is abnormal, for example, the problems such as poor sealing of pressing strip, entry of foreign matters, creased sealing opening, broken bag occur. In this case, it is necessary to end the vacuumization in advance. 
     At step  206 , vacuumization is stopped, and the vaccumization region  301  is depressurized and opened. 
     After it is determined that the vacuumization is abnormal, the vacuumization of the vacuum pump  331  may be stopped, and the vacuumization region  301  is depressurized by the pressure relief device. 
     At step  207 , the vacuumization is stopped to heat the sealing opening. 
     After the vacuumization step is completed, the vacuum pump is stopped and the heating wire is started to perform hot melting plastic sealing for the storage bag. 
     At step  208 , after the time for heating the sealing opening reaches a heating time, air release stage is started after a delay of a first time. 
     After the sealing opening heating device performs heating plastic sealing for the storage bag for the heating time, the air release stage may be started after a delay of the first time. The heating time and the first time may be set according to experiences. 
     As shown in  FIG. 23 , the specific flow of the above air release and upper support ascent includes the following steps. 
     At step  301 , an air release device performs air release. Pipe air release is performed by opening an air release valve. 
     At step  302 , the air release device determines whether the air release exceeds an air release time. If yes, step  303  is performed and otherwise step  301  is performed. The air release time may be set according to experiences. 
     At step  303 , the driving device controls the upper support  302  to ascend. 
     The driving device may drive the upper support  320  to move up at a third speed to separate from the lower support  310  so as to open the vacuumization region  301 . 
     At step  304 , whether the upper support  301  ascends a set step number is determined. If yes, the ascending is ended and otherwise step  301  is performed. 
     After the upper support  320  ascends the preset step number, the next vacuumization sealing operation may be prepared. The preset step number may be a step number for the upper support  320  to arrive at the vacuumization region  301 . 
     It is noted that the first speed is greater than the second speed, the third speed is greater than the second speed, the first preset distance, the second preset distance, the first speed, the second speed and the third speed all may be set according to experiences, and the first preset distance and the second preset distance can be realized by controlling a preset advancing step number of the electric motor. 
       FIG. 24A  is a structural schematic diagram of a lower support, a small insulation door and a door in a locked state according to some examples of the present disclosure.  FIG. 24B  is a structural schematic diagram of dismounting a lower support and a small insulation door from a door according to some examples of the present disclosure. In some examples of the present disclosure, as shown in  FIGS. 24A and 24B , the lower support  310  is detachably connected to the small insulation door  250 . As shown in  FIG. 25 , the small insulation door  250  is formed of the first housing  251  and the second housing  252  with opening cavity structures and the insulation piece disposed between the first housing  251  and the second housing  252 . The first housing  251  is snap-fitted with the second housing  252 , the extension arm  2511  is disposed on the first housing  251  along a direction away from the second housing  252 , and the lower support  310  is detachably connected to the extension arm  2511 . 
     In some examples, a first limiting portion extending upward is formed on an end of the extension arm  2511 , a second limiting portion mated with the first limiting portion is formed on a lower side of the lower support  310 , and the first limiting portion and the second limiting portion are mated to position the lower support  310  on the extension arm  2511 . More specifically, the first limiting portion is a limiting plate and the limiting portion is a baffle plate formed on the bottom of the lower support  310  and extending downwardly. The baffle plate is inserted into the inner side of the limiting plate to mount the lower support  310  to the extension arm  2511 , thus avoiding the problem of poor sealing of the vacuumization region caused by horizontal movement of the lower support  310 . 
     In order to further guarantee the heat insulation of the door  200  and avoid cold leakage occurring from the clearance between the mounting hole  201  and the small insulation door  250 , the small door gasket  253  is disposed between the small insulation door  250  and the door inner liner  220 . Specifically, the support arm  2512  is disposed at the position of the first housing  251  mated with the door inner liner  220 , and the size of the support arm  2512  is greater than that of the mounting hole  201 . A mounting groove surrounding the mounting hole  201  is disposed on the support arm  2512  and the small door gasket  253  is mounted in the mounting groove. 
     Specifically, in order to guarantee the small insulation door  250  can be reliably fixed on the door  200 , the locking device  400  is disposed between the small insulation door  250  and the door inner liner  220 . 
       FIG. 25  is an exploded view of a small insulation door, a lower support and a locking hook assembly according to some examples of the present disclosure. As shown in  FIG. 25 , the locking device  400  includes a locking hook  440  hinged at the bottom of the small insulation door  250 . The middle of the locking hook  440  is provided with a hinging shaft for connecting with the small insulation door  250  to connect with the small insulation door  250 . The locking device further includes a locking groove formed on the door inner liner  220  to mate with the locking hook and a reset torsion spring  450  sleeved on the hinging shaft. One support leg of the reset torsion spring is abutted against the small insulation door  250  and the other support leg is abutted against the locking hook  440 . In an initial state, the torsional force of the reset torsion spring  450  enables the locking hook  450  to be in the first position so that the small insulation door  250  can be mounted on the door. 
     Specifically, in order to improve the aesthetics of the small door, a mounting recess is formed on the bottom of the small door and the locking hook is mounted into the mounting recess.  FIGS. 24A and 24B  show a process of dismounting the small insulation door  250  and the lower support  310 . When the small insulation door  250  and the lower support  310  are mounted on the door  200 , the locking hook is mated with the locking groove to realize the locked state of the small insulation door  250 . When the small insulation door  250  and the lower support  310  are to be dismounted, the locking hook is moved away from the locking groove, the locking device  400  is in an unlocked state, and the small insulation door  250  and the lower support  310  can be pulled out. After the lower support  310  is removed from the small insulation door  250 , cleaning can be performed for the lower support  310 . In this example, the lower support  310  is detachably connected to the small insulation door  250 , facilitating cleaning the lower support  310 . 
       FIG. 26A  is a structural schematic diagram of a lower support, a small insulation door and a door in a locked state according to some examples of the present disclosure.  FIG. 26B  is a structural schematic diagram of a small insulation door and a door in an unlocked state according to some examples of the present disclosure.  FIG. 26C  is a structural schematic diagram of dismounting a lower support and a small insulation door from a door according to some examples of the present disclosure. 
     In some examples of the present disclosure, as shown in  FIGS. 26A-26C , the lower support  310  and the small insulation door  250  are disposed independent from each other. The lower side of the mounting hole  201  is provided with a limiting portion limiting the lower support  310  to be in place, one end of the lower support  310  is abutted against the limiting portion and the other end is abutted against the small insulation door  250 . In this case, the small insulation door  250  can be mounted to the door  200  by use of the locking device  400  of example 1 or 2. 
       FIG. 27  is a structural schematic diagram of a refrigerator according to some examples of the present disclosure.  FIG. 28  is an exploded view of a refrigerating door according to some examples of the present disclosure. In some examples of the present disclosure, as shown in  FIGS. 27 and 28 , in order to ensure the external aesthetics of the door  200  of the refrigerator and avoid exposure of the vacuum sealing device  300  at the outer side of the door  200 , an auxiliary door plate  280  is disposed at the area of the door  200  where the vacuum sealing device  300  is located. The auxiliary door plate  280  has a width identical with that of other area of the door  200 . The auxiliary door plate  280  is connected to the area by snap fitting or bonding. A surface of the auxiliary door plate  280  is flushed with the surface of other area of the door  200 . An inserting hole  281  is formed on the auxiliary door plate  280  and a lower surface of the inserting hole  281  is flushed with the upper surface of the first opening cavity  311 . When performing vacuum plastic sealing, the user may directly insert the opening of the storage bag from the inserting hole  281  of the auxiliary door plate  280  and directly extend it to the upper surface of the first opening cavity  311 . When the upper support  320  moves downward, the opening of the storage bag can be placed in the vacuumization region  301 . A display control device  282  is further disposed on the auxiliary door plate  280 . The display control device  282  includes an indicating device for displaying a working state of the vacuum sealing device  300  and a control button for controlling the vacuum sealing device  300  to stop or start. The user may determine whether to pull out the storage bag according to the working state of the vacuum sealing device  300  indicated by the indicating device. 
       FIG. 29  is a structural schematic diagram of a refrigerator according to some examples of the present disclosure.  FIG. 30  is an exploded view of a refrigerating door according to some examples of the present disclosure.  FIG. 31  is an exploded view of a lower support according to some examples of the present disclosure. In some examples of the present disclosure, as shown in  FIGS. 29-31 , the lower support  310  is detachably mounted to the door  200  from the outer side of the door  200 . 
     In some examples, the lower support  310  is detachably connected to the door  200  by push ejection. As shown in  FIGS. 29 and 30 , a connection surface of the lower support  310  connecting with the door  200  is provided with a second push ejection switch  380 . The second push ejection switch  380  includes a push ejection lock  381 , and a lock catch  382 . A groove for receiving the lock catch  382  is disposed on an inner side surface of the lower support  310  and the push ejection lock  381  is fixed on the outer side surface of the door  200 . 
       FIG. 32A  is a structural schematic diagram of a lower support and a door in a locked state according to some examples of the present disclosure.  FIG. 32B  is a structural schematic diagram of dismounting a lower support from a door according to some examples of the present disclosure. As shown in  FIG. 32A , when the lower support  310  is pressed along a direction perpendicular to the door  200 , the push ejection lock  381  is fitted with the lock catch  382 , and the lower support  310  is mounted on the door  200 . As shown in  FIG. 32B , when the lower support  310  is pressed again, the push ejection lock  381  releases the lock catch  382  so that the lower support  310  is dismounted from the door  200 . In this way, the user may perform cleaning for the lower support  310  separately, facilitating user operation. 
     In some examples of the present disclosure, as shown in  FIGS. 33A and 33B , the lower support  310  is detachably mounted to the door  200  from the outer side of the door  200 . 
     In some examples, the lower support  310  is detachably connected to the door  200  by snap fitting. A first fitting portion  391  and a second fitting portion  392  mutually mated are formed respectively on the lower support  310  and the door  200 . The first fitting portion  391  is formed on the lower surface of the lower support  310  and specifically is a bending hook. The second fitting portion  392  is fixedly connected to a front side surface of the door  200 . The lower support  310  moves close to the door  200  until the first fitting portion  391  and the second fitting portion  392  are mated, realizing the mounting of the lower support  310 . During dismounting, the lower support  310  is pulled outwardly, and the first fitting portion  391  and the second fitting portion  392  are separated due to elastic deformation. Thus, the user can perform separate cleaning for the lower support  310 , facilitating user operation. 
     Obviously, the above examples are only used to clearly describe the present disclosure rather than limit the present disclosure. Those skilled in the prior art may make different types of other changes or modifications based on the above descriptions. All examples are not necessarily or cannot be exhausted herein. All apparent changes or modifications derived herein still fall within the scope of protection of the present disclosure.