CN112984892A

CN112984892A - Refrigerator and air-conditioning preservation method thereof

Info

Publication number: CN112984892A
Application number: CN201911275771.0A
Authority: CN
Inventors: 杨春
Original assignee: Hisense Shandong Refrigerator Co Ltd
Current assignee: Hisense Shandong Refrigerator Co Ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2021-06-18

Abstract

The invention discloses a refrigerator and a modified atmosphere preservation method thereof, and relates to the technical field of modified atmosphere preservation. Through the mode that when extracting the interior oxygen of freshness preservation chamber, fill nitrogen gas for the freshness preservation chamber, make the interior outer pressure balance of freshness preservation chamber to form the gas atmosphere of rich nitrogen poor oxygen, the fresh-keeping time of extension edible material, it is low to suction device's requirement, also low to the sealing performance requirement of freshness preservation chamber, it is also more convenient that the user opens the refrigerator door. The refrigerator comprises a low-temperature storage chamber and a suction device, wherein a fresh-keeping chamber, a first air conditioning film, an oxygen enrichment chamber and a second air conditioning film are arranged in the low-temperature storage chamber, the first air conditioning film is arranged on the fresh-keeping chamber, the oxygen enrichment chamber forms an oxygen-enriched gas collecting cavity for collecting oxygen-enriched gas in an air-conditioned fresh-keeping space, the second air conditioning film is arranged on the oxygen enrichment chamber, and the suction device is used for pumping the oxygen-enriched gas in the oxygen enrichment chamber to the outside of the fresh-keeping chamber. Meanwhile, the invention also provides a modified atmosphere preservation method for the refrigerator. The food fresh-keeping device can be used for keeping food materials in the refrigerator fresh.

Description

Refrigerator and air-conditioning preservation method thereof

Technical Field

The invention relates to the technical field of controlled atmosphere preservation, in particular to a refrigerator and a controlled atmosphere preservation method thereof.

Background

The modified atmosphere preservation technology is a technology for prolonging the storage life of food materials by regulating the gas atmosphere (gas component ratio or gas pressure) of a closed space where stored goods are located, and the basic principle is as follows: in a certain closed space, a gas atmosphere different from normal air components is obtained through various regulation modes so as to inhibit physiological and biochemical processes and activities of microorganisms which cause the putrefaction and deterioration of stored objects (generally food materials).

In the preservation technology of the refrigerator, oxygen is closely related to the oxidation and respiration of food in the refrigerator. The slower the respiration of the food material, the lower its oxidation, and the longer the preservation time. The oxygen content in the air is reduced, a nitrogen-rich and oxygen-poor fresh-keeping gas atmosphere is formed, and the food material fresh-keeping effect is obvious. The nitrogen-rich and oxygen-poor fresh-keeping gas atmosphere refers to a gas atmosphere with the nitrogen content exceeding that in normal air and the oxygen content lower than that in normal air. At present, in order to reduce the content of oxygen in a refrigerator fresh-keeping chamber, in the prior art, vacuum bag fresh keeping and vacuum storage space fresh keeping are generally utilized or a deoxidizing device is additionally arranged for low-oxygen fresh keeping. The vacuum bag is adopted for fresh keeping, the vacuumizing action is needed when a user stores food every time, and the operation is complex. Adopt the fresh-keeping of vacuum storing space to take out the air in the fresh-keeping room totally, form vacuum environment to this contact of isolated food and oxygen, thereby the save time of extension food, and adopt deoxidation device to carry out the low oxygen fresh-keeping and only take out the oxygen in the fresh-keeping room, reduce the oxygen concentration in the fresh-keeping room, when adopting deoxidation device to carry out the low oxygen fresh-keeping, also be vacuum state in the fresh-keeping room, the common shortcoming of these two kinds of fresh-keeping modes is: because the box body and the like are rigid structures, the requirement on a suction device is high and the requirement on the sealing performance of the refrigerator is also high when the box body and the like are in a vacuum state, and when an article is taken and placed, a lot of fresh air flows in, and a lot of energy is consumed for pumping the fresh air or oxygen in the fresh-keeping chamber to form the vacuum state. In addition, because the fresh-keeping room is vacuum environment, the user needs to spend very big strength when opening the fresh-keeping room door at every turn, causes the user to use inconveniently.

Disclosure of Invention

The embodiment of the invention provides a refrigerator and a modified atmosphere preservation method thereof, wherein the pressure inside and outside a preservation chamber is balanced by pumping oxygen in the preservation chamber and simultaneously filling nitrogen into the preservation chamber, a nitrogen-rich and oxygen-poor gas atmosphere is formed, the preservation time of food materials is prolonged, the requirements on a suction device and the sealing performance of the preservation chamber are low, and a user can open a refrigerator door more conveniently.

To achieve the above object, an embodiment of the present invention provides a refrigerator, including: a low temperature storage chamber forming a low temperature storage space; the preservation chamber is positioned in the low-temperature storage chamber to form a modified atmosphere preservation space for storing food materials; the first air-conditioning film is arranged on the fresh-keeping chamber and separates the air-conditioning fresh-keeping space from the outside of the fresh-keeping chamber, and the first air-conditioning film allows nitrogen in the air to pass through and can block at least part of oxygen in the air; the oxygen-enriched chamber is positioned in the fresh-keeping chamber or outside the fresh-keeping chamber and forms an oxygen-enriched gas collecting cavity for collecting oxygen-enriched gas in the controlled atmosphere fresh-keeping space; the second controlled atmosphere film is arranged on the oxygen-enriched chamber and separates the controlled atmosphere preservation space and the oxygen-enriched gas collecting cavity, and the second controlled atmosphere film allows oxygen in the gas in the controlled atmosphere preservation space to pass through and can block at least part of nitrogen in the gas in the controlled atmosphere preservation space; and the suction device is used for pumping the oxygen-enriched gas in the oxygen-enriched gas collection cavity to the outside of the fresh-keeping chamber.

According to the refrigerator provided by the embodiment of the invention, when the suction device extracts air in the oxygen-enriched air collection cavity, the pressure of the oxygen-enriched air collection cavity is smaller than the pressure of the atmosphere control fresh-keeping space, and the pressure of the atmosphere control fresh-keeping space is smaller than the pressure outside the fresh-keeping chamber; because the pressure in the oxygen-enriched gas collecting cavity is smaller than the pressure in the controlled atmosphere fresh-keeping space, oxygen in the gas in the controlled atmosphere fresh-keeping space enters the oxygen-enriched gas collecting cavity through the second controlled atmosphere film and is mixed with the air in the oxygen-enriched gas collecting cavity to form oxygen-enriched gas, at least one part of nitrogen in the controlled atmosphere fresh-keeping space is blocked, the oxygen-enriched gas in the oxygen-enriched gas collecting cavity is continuously pumped away along with the oxygen-enriched gas, meanwhile, the nitrogen in the external air continuously enters the controlled atmosphere fresh-keeping space, the amount of the oxygen in the controlled atmosphere fresh-keeping space is continuously reduced, the amount of the nitrogen is continuously increased, the operation of the suction device is stopped until the nitrogen-enriched and oxygen-poor. Therefore, nitrogen is filled while the amount of oxygen in the modified atmosphere fresh-keeping space is reduced, so that nitrogen-rich and oxygen-poor gas atmosphere is formed, the fresh-keeping time of food materials is prolonged, the performance requirement on a suction device and the sealing performance requirement on the fresh-keeping chamber are reduced due to the balance of the pressure inside and outside the fresh-keeping chamber, and the opening of the fresh-keeping chamber door by a user is more convenient.

On the other hand, the embodiment of the invention provides a modified atmosphere preservation method for the refrigerator, which comprises the following steps: receiving a fresh-keeping instruction; the control suction device pumps the gas in the oxygen-enriched gas collecting cavity to the outside of the fresh-keeping chamber, the air pressure of the oxygen-enriched gas collecting cavity is reduced, under the action of pressure difference, oxygen in the gas in the controlled atmosphere fresh-keeping space enters the oxygen-enriched gas collecting cavity through a second controlled atmosphere film arranged on the oxygen-enriched chamber, the controlled atmosphere fresh-keeping space forms negative pressure, and under the action of the negative pressure, nitrogen in the air outside the fresh-keeping chamber enters the controlled atmosphere fresh-keeping space through a first controlled atmosphere film arranged on the fresh-keeping chamber; and controlling the suction device to stop running after the preset time is reached.

According to the modified atmosphere preservation method for the refrigerator, which is provided by the embodiment of the invention, as the suction device, the first modified atmosphere film, the second modified atmosphere film, the oxygen enrichment chamber and the preservation chamber are all based on the refrigerator, the modified atmosphere preservation method provided by the embodiment of the invention can solve the same technical problems and produce the same technical effects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

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

FIG. 2 is a schematic diagram of the connection between the fresh keeping compartment, the first air adjusting membrane and the suction device in the refrigerator according to the embodiment of the present invention;

FIG. 3 is a schematic diagram of a fresh food compartment of a refrigerator according to an embodiment of the present invention;

FIG. 4 is an exploded view of a fresh food compartment of a refrigerator according to an embodiment of the present invention;

FIG. 5 is a schematic view illustrating a connection between a first air adjusting film and a first mounting frame in a refrigerator according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a drawer in a refrigerator according to an embodiment of the present invention;

FIG. 7 is a schematic view of the connection between the oxygen enrichment chamber and the second controlled atmosphere film in the refrigerator according to the embodiment of the invention;

FIG. 8 is a schematic view of the connection between a second modified atmosphere film and a second mounting rack in the refrigerator according to the embodiment of the invention;

FIG. 9 is a schematic view of the connection between the upper case and the oxygen enrichment chamber in the refrigerator according to the embodiment of the present invention;

fig. 10 is a schematic structural view of a lower case in a refrigerator according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1, 2, 4, 7 and 9, an embodiment of the present invention provides a refrigerator having an approximately rectangular parallelepiped shape, an external appearance of which is defined by a storage compartment defining a storage space and a plurality of door bodies disposed in the storage compartment, wherein the door bodies include a door body outer shell located outside the storage compartment, a door body inner container located inside the storage compartment, an upper end cover, a lower end cover, and a heat insulating layer located between the door body outer shell, the door body inner container, the upper end cover, and the lower end cover, and typically, the heat insulating layer is filled with a foam, and the storage compartment is a box body having an opening. The refrigerator comprises a low-temperature storage chamber, a fresh-keeping chamber 1, a modified atmosphere film 2 and a suction device 3, wherein the fresh-keeping chamber 1 is arranged in the low-temperature storage chamber, the fresh-keeping chamber 1 forms a modified atmosphere fresh-keeping space 4 for storing food materials, a first modified atmosphere film 2 is arranged on the fresh-keeping chamber 1, the first modified atmosphere film 2 can separate the modified atmosphere fresh-keeping space 4 from the outside of the fresh-keeping chamber 1, the first modified atmosphere film 2 allows nitrogen in the air to pass through and can isolate at least part of oxygen in the air, an oxygen-enriched chamber 26 is arranged in the fresh-keeping chamber 1 or outside the fresh-keeping chamber 1, the oxygen-enriched chamber 26 forms an oxygen-enriched gas collecting cavity 27 for collecting oxygen-enriched gas in the modified atmosphere fresh-keeping space 4, the oxygen-enriched chamber 26 is provided with a second modified atmosphere film 25, the number of the second modified atmosphere film 25 is at least one, the second modified atmosphere film 25 allows oxygen in the gas in the modified atmosphere fresh-keeping space, the suction device 3 is used for pumping the oxygen-enriched gas in the oxygen-enriched gas collection cavity 27 to the outside of the fresh keeping chamber 1.

According to the refrigerator provided by the embodiment of the invention, when the suction device 3 extracts the gas in the oxygen-enriched gas collection cavity 27, the pressure of the oxygen-enriched gas collection cavity 27 is less than the pressure of the controlled atmosphere preservation space 4, the pressure of the controlled atmosphere preservation space 4 is less than the pressure outside the preservation chamber 1, and as the pressure of the controlled atmosphere preservation space 4 is less than the pressure outside the preservation chamber 1, nitrogen in the outside air enters the controlled atmosphere preservation space 4 through the first controlled atmosphere film 2, and at least part of oxygen in the outside air is blocked; because the pressure of the oxygen-enriched gas collecting cavity 27 is less than the pressure of the controlled atmosphere fresh-keeping space 4, oxygen in the gas of the controlled atmosphere fresh-keeping space 4 enters the oxygen-enriched gas collecting cavity 27 through the second controlled atmosphere film 25 and is mixed with the air in the oxygen-enriched gas collecting cavity 27 to form oxygen-enriched gas, at least a part of nitrogen in the controlled atmosphere fresh-keeping space 4 is blocked, the oxygen-enriched gas in the oxygen-enriched gas collecting cavity 27 is continuously pumped away, meanwhile, the nitrogen in the external air continuously enters the controlled atmosphere fresh-keeping space 4, the amount of the oxygen in the controlled atmosphere fresh-keeping space 4 is continuously reduced, the amount of the nitrogen is continuously increased, the suction device 3 stops operating after the nitrogen-enriched and oxygen-depleted gas atmosphere is formed, and the pressure inside and outside the fresh-keeping. Therefore, nitrogen is filled while the amount of oxygen in the controlled atmosphere preservation space 4 is reduced, so that a nitrogen-rich and oxygen-poor gas atmosphere is formed, the preservation time of food materials is prolonged, the performance requirements on the suction device 3 and the sealing performance requirements on the preservation chamber 1 are reduced due to the balance of the internal pressure and the external pressure of the preservation chamber 1, and the preservation chamber door is more convenient for a user to open.

Referring to fig. 4, 7 and 9, the fresh-keeping chamber 1 may be provided with a fresh-keeping chamber air inlet 5, the first air-conditioning film 2 is hermetically disposed at the fresh-keeping chamber air inlet 5, the oxygen-enriched chamber 26 may also be located inside the fresh-keeping chamber 1, the oxygen-enriched chamber 26 may be provided with an oxygen-enriched chamber air inlet 28, the second air-conditioning film 25 is disposed at the oxygen-enriched chamber air inlet 28, the fresh-keeping chamber 1 and the oxygen-enriched chamber 26 share the air outlet 6, an air inlet of the suction device 3 is communicated with the air outlet 6, and the oxygen-enriched air in the oxygen-enriched air collecting cavity 27 can be discharged from the air. When the gas in the oxygen-enriched gas collecting cavity 27 is discharged from the gas outlet 6, the outside air can not directly enter the controlled atmosphere fresh-keeping space 4, but only can enter the controlled atmosphere fresh-keeping space 4 after being isolated by the first controlled atmosphere film 2 and the oxygen in the gas in the controlled atmosphere fresh-keeping space 4 can not directly enter the oxygen-enriched gas collecting cavity 27, or can enter the oxygen-enriched gas collecting cavity 27 after being isolated by the second controlled atmosphere film 25 and the nitrogen, thus shortening the time of reaching the required oxygen concentration value in the controlled atmosphere fresh-keeping space 4, further shortening the running time of the suction device 3, saving resources and reducing cost, and in addition, because the oxygen-enriched chamber 26 is positioned in the fresh-keeping chamber 1, the internal space of the refrigerator is not required to be additionally occupied.

Referring to fig. 9, since a user is generally used to stack food items from the center to the periphery, and stack the food items from the bottom to the top, the probability that the centers of the bottom and middle parts of the modified atmosphere preservation space 4 are occupied is higher than that of the corners of the upper part of the modified atmosphere preservation space, thus, the oxygen-enriching chamber 26 can comprise an oxygen-enriching chamber bottom wall, an oxygen-enriching chamber front wall 262, two oxygen-enriching chamber side walls 263, an oxygen-enriching chamber top wall 264 shared with the fresh food compartment 1, and an oxygen-enriching chamber rear wall 265 shared with the fresh food compartment 1, the height of the oxygen-enriching chamber front wall 262 being less than the height of the oxygen-enriching chamber rear wall 265, the oxygen-enriching chamber air inlet 28 being located on the oxygen-enriching chamber bottom wall, the air outlet 6 being located on the oxygen-enriching chamber rear wall 265, in order to maximize the size of the oxygen enrichment chamber inlet 28 and to make the gas flow faster, the oxygen enrichment chamber inlet 28 may be formed directly from the oxygen enrichment chamber front wall 262, the two oxygen enrichment chamber side walls 263, and the oxygen enrichment chamber rear wall 265 without the oxygen enrichment chamber bottom wall. Because the height of oxygen-enriched chamber front wall 262 is less than the height of oxygen-enriched chamber rear wall 265, under the prerequisite of oxygen-enriched chamber air inlet 28 size is certain, the volume of oxygen-enriched chamber 26 is littleer, and the space that occupies is littleer, from this, can make oxygen-enriched chamber 26 occupy the position of depositing edible material frequently as far as possible, improves user convenience, still can practice thrift the cost.

Referring to fig. 1, since the temperature of the fresh food compartment 1 is generally higher than that of the low-temperature storage compartment, if the gas exhausted from the modified atmosphere fresh food space 4 directly enters the low-temperature storage compartment, the storage effect of the low-temperature storage compartment is affected, and therefore, the exhaust port of the suction device 3 can be communicated with the outside of the refrigerator. Therefore, the gas exhausted from the air-conditioning preservation space 4 can be directly exhausted to the outside of the refrigerator, and the storage effect of the low-temperature storage chamber cannot be influenced.

The suction device 3 can be arranged at a plurality of positions, and for example, the suction device 3 can be positioned inside the fresh food compartment 1; as a further example, with reference to fig. 2, the suction device 3 may also be located inside the compressor compartment or in an area outside the fresh food compartment inside the cryogenic storage compartment. Since the interior of the fresh food compartment 1 is limited and the suction device 3 occupies the interior of the fresh food compartment 1 when located inside the fresh food compartment 1, it is preferable that the suction device 3 be located inside the compressor compartment or in an area outside the fresh food compartment 1 within the low-temperature storage compartment. When the suction device 3 is positioned in the compressor bin, the space for installing the suction device 3 is not required to be additionally arranged, the structure of the refrigerator is more compact, and when the suction device 3 is positioned in the area outside the fresh-keeping chamber 1 in the low-temperature storage chamber, the internal space of the fresh-keeping chamber 1 is not occupied.

The first air-adjusting film 2 is a nitrogen-rich film made of a high molecular organic material, and the surface of the first air-adjusting film 2 is provided with a high molecular group which is close to nitrogen, so that when the pressure difference exists on two sides of the first air-adjusting film 2, the nitrogen can easily cover the film and pass through the film, namely when the suction device 3 sucks air, the pressure of the air-conditioned fresh-keeping space 4 is smaller than the pressure outside the fresh-keeping chamber 1, at the moment, the nitrogen in the air outside the fresh-keeping chamber 1 penetrates through the first air-adjusting film 2 to enter the air-conditioned fresh-keeping space 4, and most oxygen in the air is blocked.

The second controlled atmosphere film 25 is an oxygen-rich film made of a polymer organic material, and the surface of the second controlled atmosphere film 2 has polymer groups which are close to oxygen, so that when the pressure difference exists at the two sides of the second controlled atmosphere film 25, oxygen can easily cover the film and pass through the film, i.e. when the suction device 3 sucks air, the pressure of the oxygen-rich gas collecting cavity 27 is lower than that of the controlled atmosphere space 4, at the moment, oxygen in the gas in the controlled atmosphere space 4 passes through the second controlled atmosphere film 25 and enters the oxygen-rich gas collecting cavity 27, and most nitrogen in the gas in the controlled atmosphere space 4 is blocked.

The thicker the first air-conditioning film 2, the lower the oxygen permeability, the higher the nitrogen purity in the air-conditioning fresh-keeping space 4, but the smaller the nitrogen permeability, the longer the pumping time of the pumping device 3, the higher the cost, and the poorer the user experience, and in a similar way, the thicker the second air-conditioning film 25, the lower the nitrogen permeability, the higher the cost, and the poorer the user experience, therefore, the thicknesses of the first air-conditioning film 2 and the second air-conditioning film 25 can both be 0.8-1.5 mm, preferably 1mm, the first air-conditioning film 2 in this thickness range can ensure that the oxygen permeability is not too high, and can also ensure that the nitrogen permeability is not too low, the second air-conditioning film 25 in this thickness range can ensure that the nitrogen permeability is not too high, and can also ensure that the oxygen permeability is not too low, the pumping time of the pumping device 3 is also short, and the highest cost performance ratio is achieved.

The first air adjusting film 2 can be installed in various ways, for example, the first air adjusting film 2 can be directly adhered to the air inlet 5 of the fresh-keeping chamber; for another example, referring to fig. 5, the first air-conditioning film 2 may be installed at the air inlet 5 of the fresh-keeping chamber through the first installation frame 7, and the outer wall of the first installation frame 7 is hermetically connected with the inner wall of the air inlet 5 of the fresh-keeping chamber, because the first air-conditioning film 2 is directly bonded at the air inlet 5 of the fresh-keeping chamber, if the first air-conditioning film 2 needs to be replaced, the first air-conditioning film 2 needs to be torn off from the air inlet 5 of the fresh-keeping chamber, and the first air-conditioning film 2 is made of a high molecular organic material, and is soft in material and can be; when first air adjusting film 2 is installed in fresh-keeping room air inlet 5 department through first mounting bracket 7, when needing to change first air adjusting film 2, only need with first mounting bracket 7 from fresh-keeping room air inlet 5 department demolish can, first air adjusting film 2 can not damaged, so, preferred first air adjusting film 2 installs in fresh-keeping room air inlet 5 department through first mounting bracket 7.

Referring to fig. 7 to 9, similarly, in order to prevent the second modified atmosphere film 25 from being damaged when the film is removed, the second modified atmosphere film 25 can be mounted at the oxygen-enriched chamber air inlet 28 through the second mounting frame 29.

The first mounting rack 7 and the fresh food compartment 1 can be connected in various ways, for example, the first mounting rack 7 can be directly adhered to the upper surface of the fresh food compartment 1; in another example, the outer wall of the first mounting frame 7 can be hermetically connected with the inner wall of the fresh-keeping chamber air inlet 5, that is, the external dimension of the first mounting frame 7 can be matched with the dimension of the inner hole of the fresh-keeping chamber air inlet 5, the first mounting frame 7 can extend into the fresh-keeping chamber air inlet 5 and is hermetically connected with the hole wall of the fresh-keeping chamber air inlet 5, because the first mounting frame 7 is directly bonded on the upper surface of the fresh-keeping chamber 1, the first mounting frame 7 and the first air-conditioning film 2 are higher than the upper surface of the fresh-keeping chamber 1, and the overall height of the fresh-keeping chamber 1 is increased more; first mounting bracket 7 stretches into in the freshfood compartment air inlet 5 to when being connected with the pore wall sealing of freshfood compartment air inlet 5, only first air adjusting film 2 is higher than freshfood compartment 1, because first air adjusting film 2 itself is very thin and is soft material, so the height increase volume of freshfood compartment 1 can be ignored, so, the outer wall of preferred first mounting bracket 7 and the inner wall sealing of freshfood compartment air inlet 5 are connected.

Referring to fig. 5, the shape of the first modified atmosphere membrane 2 may be rectangular, circular or other shapes, and is not limited herein, and the shape of the first mounting frame 7 is related to the shape of the first modified atmosphere membrane 2, for example, when the first modified atmosphere membrane 2 is rectangular, the first mounting frame 7 may be a rectangular frame structure, when the first modified atmosphere membrane 2 is circular, the first mounting frame 7 may be a hollow cylinder structure, and for better aesthetics and easier installation, the radial dimension of the first modified atmosphere membrane 2 may be larger than the radial dimension of the first mounting frame 7.

Referring to fig. 8, the shape of the second modified atmosphere film 25 can be rectangular, circular or other shapes, and is not limited herein, and the shape of the second mounting frame 29 is related to the shape of the second modified atmosphere film 25, for example, when the second modified atmosphere film 25 is rectangular, the second mounting frame 29 can be a rectangular frame structure, when the second modified atmosphere film 25 is circular, the second mounting frame 29 can be a hollow cylinder structure, and the second modified atmosphere film 25 can be embedded in the second mounting frame 29 for better appearance and installation convenience.

The air inlet 5 of the fresh-keeping chamber can be arranged at a plurality of positions, for example, the air inlet 5 of the fresh-keeping chamber can be arranged on the side surface of the fresh-keeping chamber 1; for another example, referring to fig. 3 and 9, the fresh-keeping chamber air inlet 5 may also be arranged at the top center of the fresh-keeping chamber 1, referring to fig. 1, because one side surface or two side surfaces of the fresh-keeping chamber 1 may sometimes be attached to or have a short distance from the refrigerator liner 20, a gap is generally formed between the top surface of the fresh-keeping chamber 1 and the refrigerator liner 20, the area of the top surface of the fresh-keeping chamber 1 is generally large, and when the fresh-keeping chamber air inlet 5 is arranged at the side surface of the fresh-keeping chamber 1, the size of the fresh-keeping chamber air inlet 5 may be limited, which results in a long working time of the air extraction device 3, and the fresh-keeping chamber air inlet 5 may also be; when the top center at freshfood compartment 1 was seted up to freshfood compartment air inlet 5, the size range of freshfood compartment air inlet 5 is bigger, and air exhaust device 3 operating time is shorter, and freshfood compartment air inlet 5 is difficult to be sheltered from, and the circulation of air is more smooth and easy, consequently, the top center at freshfood compartment 1 is seted up to preferred freshfood compartment air inlet 5.

There are various realizable ways of the suction device 3, and the suction device 3 may be a fan, for example; as another example, referring to fig. 2, the suction device 3 may also be an air pump, because the blower is generally large in volume and loud in noise; the suction pump is small in size and low in noise, so that the suction device 3 is preferably a suction pump, a suction port of the suction pump is connected to the air outlet 6 through an air pipeline 22, and an exhaust port of the suction pump is communicated with the outside of the refrigerator.

Referring to fig. 3, 4 and 6, in order to conveniently take and place food materials, the fresh food compartment 1 may include a compartment body, a sealing member 9 and a drawer 8, the compartment body forms two sidewalls, a top wall, a bottom wall and a rear wall of the fresh food compartment 1 and defines a front inlet 16, an outer side of the front inlet 16 forms a peripheral member 17 surrounding the front inlet 16, a mouth portion of the peripheral member 17 is provided with a sealing groove, the sealing member 9 is located in the sealing groove, the drawer 8 forms a storage space, the drawer 8 is capable of moving in a specific direction from the inner side of the compartment body, the drawer 8 includes a drawer front plate 15, the drawer front plate 15 may compress the sealing member 9 when the drawer 8 is closed, the drawer 8 and the compartment body are locked by a locking device, the locking device may be a snap lock including a snap and a locking tongue that are engaged with each other, the snap is disposed on the compartment body, the locking tongue is disposed, the locking and unlocking between the drawer 8 and the box body are realized. Therefore, when the suction device 3 sucks air in the fresh-keeping chamber 1, the air outside the fresh-keeping chamber 1 can only enter from the air inlet 5 of the fresh-keeping chamber, but can not enter from the gap between the drawer 8 and the fresh-keeping chamber 1, and the time for the controlled atmosphere fresh-keeping space 4 to reach the required oxygen concentration value is shortened, so that the operation time of the suction device 3 is shortened, the resources are saved, and the cost is reduced.

Referring to fig. 4, 6 and 10, drawer 8 and the box body can be connected in a sliding manner through a first slide rail assembly, the first slide rail assembly is two sets and is respectively arranged on two sides of drawer 8, the first slide rail assembly comprises a first slide rail 22 and a first roller 21, first slide rail 22 is arranged on the inner wall surface of the box body, first slide rail 22 comprises an upper slide rail 221 and a lower slide rail 222, first roller 21 is arranged on the outer wall surface of drawer 8, and first roller 21 can roll between upper slide rail 221 and lower slide rail 222 to drive drawer 8 to move back and forth. Therefore, sliding friction between the drawer 8 and the box body can be converted into rolling friction between the first sliding rail 22 and the first roller 21, and the drawer 8 moves more smoothly.

Referring to fig. 4, 6 and 10, the rollers are generally disposed near the rear wall of the drawer 8, so that the front of the drawer 8 sinks during the movement of the drawer 8, the front portion of the bottom surface of the drawer 8 easily rubs against the bottom wall surface of the box body, which results in unsmooth movement of the drawer 8, and therefore, a second slide rail assembly may be further disposed between the drawer 8 and the box body, the second slide rail assembly includes a second roller 23 and a second slide rail 24, the second roller 23 is disposed on the inner wall surface of the box body and is far away from the rear wall of the box body, the second slide rail 24 is disposed on the outer wall surface of the drawer 8 and is close to the drawer front plate 15, a slide rail is disposed at the bottom of the second slide rail 24, the second roller 23 can slide along the slide rail to drive the drawer 8 to move back and forth, the upper slide rail 221 and the lower slide rail 222 are disposed close to the. From this, when adopting second slide rail set spare, two gyro wheels that are in front and back position all contact with the slide rail, and the bottom surface of drawer 8 can not rub with the diapire face of box, and drawer 8 moves more smoothly.

The box generally is the plastics material, needs injection moulding, and when the box was the integral part, the drawing of patterns degree of difficulty was great, as shown in fig. 3, the box can be for the part of piecing, including epitheca 18 and inferior valve 19, can adopt to melt between epitheca 18 and the inferior valve 19 and bond and also can be through setting up the sealing member between the two and connect. For ease of alignment during installation or bonding, the upper shell 18 includes a top wall, a partial back wall and partial side walls, and the lower shell 19 includes a bottom wall, a partial back wall, partial side walls and peripheral members. Therefore, the box body is easier to demould and is convenient to align.

Referring to fig. 2 and 7, an embodiment of the present invention further provides a modified atmosphere preservation method for the refrigerator, including: receiving a fresh-keeping instruction; the suction device 3 is controlled to pump the air in the oxygen-enriched air collecting cavity 27 to the outside of the fresh-keeping chamber 1, the air pressure of the oxygen-enriched air collecting cavity 27 is reduced, under the action of pressure difference, oxygen in the air in the controlled atmosphere fresh-keeping space 4 enters the oxygen-enriched air collecting cavity 27 through the second controlled atmosphere film 25 arranged on the oxygen-enriched chamber 26, negative pressure is formed in the controlled atmosphere fresh-keeping space 4, and under the action of the negative pressure, nitrogen in the air outside the fresh-keeping chamber 1 enters the controlled atmosphere fresh-keeping space 4 through the first controlled atmosphere film 2 arranged on the fresh-keeping chamber 1; and controlling the suction device to stop running after the preset time is reached.

After receiving the freshness instruction, the method further comprises the following steps: detecting whether food exists in the controlled atmosphere preservation space 4 and whether the door body is closed, and controlling the suction device 3 to pump and discharge the gas in the oxygen-enriched gas collection cavity 27 to the outside of the preservation chamber 1 if the food exists in the controlled atmosphere preservation space 4 and the door body is closed; if the modified atmosphere preservation space 4 has no food or the door is not closed, the suction device 3 is not operated.

According to the modified atmosphere preservation method provided by the embodiment of the invention, nitrogen is filled while the amount of oxygen in the modified atmosphere preservation space 4 is reduced, so that a nitrogen-rich and oxygen-poor gas atmosphere is formed, the preservation time of food materials is prolonged, the performance requirements on the suction device 3 and the sealing performance requirements on the preservation chamber 1 are reduced due to the balance of the internal pressure and the external pressure of the preservation chamber 1, and the preservation chamber door is more convenient for a user to open.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A refrigerator, characterized by comprising:

a low temperature storage chamber forming a low temperature storage space;

the preservation chamber is positioned in the low-temperature storage chamber to form a modified atmosphere preservation space for storing food materials;

the first air-conditioning film is arranged on the fresh-keeping chamber and separates the air-conditioning fresh-keeping space from the outside of the fresh-keeping chamber, and the first air-conditioning film allows nitrogen in the air to pass through and can block at least part of oxygen in the air;

the oxygen-enriched chamber is positioned in the fresh-keeping chamber or outside the fresh-keeping chamber and forms an oxygen-enriched gas collecting cavity for collecting oxygen-enriched gas in the controlled atmosphere fresh-keeping space;

the second controlled atmosphere film is arranged on the oxygen-enriched chamber and separates the controlled atmosphere preservation space and the oxygen-enriched gas collecting cavity, and the second controlled atmosphere film allows oxygen in the gas in the controlled atmosphere preservation space to pass through and can block at least part of nitrogen in the gas in the controlled atmosphere preservation space;

and the suction device is used for pumping the oxygen-enriched gas in the oxygen-enriched gas collection cavity to the outside of the fresh-keeping chamber.

2. The refrigerator according to claim 1,

the fresh-keeping chamber is provided with a fresh-keeping chamber air inlet, and the first air adjusting film is hermetically arranged at the fresh-keeping chamber air inlet;

the oxygen-enriched chamber is positioned in the fresh-keeping chamber and is provided with an oxygen-enriched chamber air inlet, the second air adjusting film is arranged at the oxygen-enriched chamber air inlet in a sealing mode and is provided with an air outlet, and an air suction port of the suction device is communicated with the air outlet.

3. The refrigerator according to claim 2,

the oxygen enrichment chamber comprises an oxygen enrichment chamber bottom wall, an oxygen enrichment chamber front wall, two oxygen enrichment chamber side walls, an oxygen enrichment chamber top wall shared with the fresh-keeping chamber and an oxygen enrichment chamber rear wall shared with the fresh-keeping chamber;

the height of the front wall of the oxygen enrichment chamber is smaller than that of the rear wall of the oxygen enrichment chamber;

the air inlet of the oxygen enrichment chamber is positioned on the bottom wall of the oxygen enrichment chamber, and the air outlet is positioned on the rear wall of the oxygen enrichment chamber.

4. The refrigerator of claim 3, wherein the air outlet of the suction device is in communication with the outside of the refrigerator.

5. The refrigerator according to claim 4,

the suction device is positioned in the compressor bin; alternatively, the suction device is located in an area outside the fresh food compartment within the low-temperature storage compartment.

6. The refrigerator of claim 5, wherein the first air adjusting film is mounted at the fresh food compartment air inlet through a first mounting frame, and an outer wall of the first mounting frame is hermetically connected with an inner wall of the fresh food compartment air inlet.

7. The refrigerator of claim 6 wherein the fresh food compartment air inlet is centrally located at a top of the fresh food compartment.

8. The refrigerator according to any one of claims 1 to 7, wherein the fresh food compartment comprises:

a cabinet forming two side walls, a top wall, a bottom wall and a rear wall of the fresh food compartment and defining a front entrance; the outside of the front inlet forms a periphery around the front inlet; a sealing groove is formed in the opening of the peripheral piece;

a seal disposed within the seal groove;

a drawer forming a storage space, the drawer being provided to be movable in a designated direction from an inner side of the cabinet; the drawer includes a drawer front that compresses the seal when the drawer is closed;

and the locking device is used for locking the drawer and the box body.

9. The refrigerator according to claim 8, wherein the drawer is slidably connected to the cabinet by a first rail assembly and a second rail assembly, the first rail assemblies are two sets and are respectively disposed at two sides of the drawer, and the first rail assembly comprises:

the first slide rail is arranged on the inner wall surface of the box body and comprises an upper slide rail and a lower slide rail;

the first idler wheel is arranged on the outer wall surface of the drawer and can roll between the upper sliding rail and the lower sliding rail to drive the drawer to move back and forth;

the second slide rail set spare is two sets of and set up respectively in the both sides of drawer, the second slide rail set spare includes:

the second roller is arranged on the inner wall surface of the box body and is far away from the rear wall;

the second sliding rail is arranged on the outer wall surface of the drawer and is close to the drawer front plate, a sliding way is arranged at the bottom of the second sliding rail, and the second roller can slide along the sliding way to drive the drawer to move back and forth;

the upper sliding rail and the lower sliding rail are arranged close to the rear wall, and the first idler wheel is far away from the drawer front plate.

10. A modified atmosphere preservation method for the refrigerator of any one of claims 1 to 9, characterized by comprising the following steps:

receiving a fresh-keeping instruction; the control suction device pumps the gas in the oxygen-enriched gas collecting cavity to the outside of the fresh-keeping chamber, the air pressure of the oxygen-enriched gas collecting cavity is reduced, under the action of pressure difference, oxygen in the gas in the controlled atmosphere fresh-keeping space enters the oxygen-enriched gas collecting cavity through a second controlled atmosphere film arranged on the oxygen-enriched chamber, the controlled atmosphere fresh-keeping space forms negative pressure, and under the action of the negative pressure, nitrogen in the air outside the fresh-keeping chamber enters the controlled atmosphere fresh-keeping space through a first controlled atmosphere film arranged on the fresh-keeping chamber; and controlling the suction device to stop running after the preset time is reached.