Patent Description:
With the development of society and the improvement of people's living standards, as well as the ever-increasingly faster pace of people's life, people often put a large number of articles they buy in a variety of refrigerators. However, for leafy vegetables and melons and fruits, the low temperature in a storage space of the refrigerator will not only cause wrinkles and marks on skins of these foods, but also affect their original tastes and nutrition.

In the freshness-keeping technology for refrigerators, oxygen is closely related to the oxidation and respiration of food in the refrigerators. The slower the food breathes, the lower the oxidation of the food and the longer the freshness-keeping time. The reduction in the content of oxygen in air has a significant effect on freshness-keeping of food. At present, in order to reduce the content of oxygen in the refrigerator, vacuum freshness-keeping or an additional deoxidation device is generally used in the prior art to perform low oxygen freshness-keeping. However, the operation of vacuum freshness-keeping is usually cumbersome and inconvenient to use. The deoxidation device usually makes use of electrolyte or the like for deoxidation, and is relatively complicated and does not present an obvious deoxidation effect.

The air-conditioning freshness-keeping technology refers generally to a technique for prolonging the storage life of a food by regulating a gas atmosphere (gas composition ratio or gas pressure) of an enclosed space in which stored articles are located, with the basic principle being as follows: in a certain enclosed space, a gas atmosphere different from normal air components is obtained by various regulation methods to suppress physiological and biochemical processes and microbial activities leading to spoilage of the stored articles (generally, food). In particular, in the present application, the air-conditioning freshness-keeping in question will be specifically directed to an air-conditioning freshness-keeping technology that regulates the proportions of gas components.

It is known to those skilled in the art that normal air components include (in percentage by volume, hereinafter the same): about <NUM>% of nitrogen, about <NUM>% of oxygen, about <NUM>% of rare gas (helium, neon, argon, krypton, xenon, radon), <NUM>% of carbon dioxide, and <NUM>% of other gases and impurities (e.g., ozone, nitric oxide, nitrogen dioxide, and water vapor). In the field of air-conditioning freshness-keeping, a nitrogen-rich and oxygen-poor freshness-keeping gas atmosphere is obtained generally by filling an enclosed space with a nitrogen-rich gas to reduce the oxygen content. Here, it is known to those skilled in the art that the nitrogen-rich gas refers to a gas having a nitrogen content exceeding the content of nitrogen in the normal air, for example, the content of nitrogen in the nitrogen-rich gas may be <NUM>% to <NUM>% or even higher; and the nitrogen-rich and oxygen-poor freshness-keeping gas atmosphere refers to a gas atmosphere in which the nitrogen content exceeds the content of nitrogen in the normal air and the oxygen content is lower than the content of oxygen in the normal air.

However, nitrogen generating equipment traditionally used for air-conditioning freshness-keeping is bulky and costly, resulting in that this technology is basically limited to use in various large-scale professional storehouses (the storage capacity is generally at least <NUM> tons or more), and is not applicable to families or individual users.

Patent document <CIT> discloses a refrigerator including a storage container partitioned into a general preservation chamber and a long-period preservation chamber; an oxygen removal means is disposed at the rear of the storage container, and a blower means is provided in a machine chamber. By actuating the blower means, the air in the long-period preservation chamber is passed through the removal means to maintain the air in the long-period preservation chamber at a low oxygen concentration. Patent document <CIT> discloses a refrigerator comprising a suction pump for sucking air from a vegetable container through an oxygen enrichment membrane into the outside of the refrigerator, and a moisture conditioning member for absorbing excessive moisture from the vegetable container when the vegetable container is in a too much humid condition, and for releasing the absorbed moisture into the vegetable container when the vegetable container is in a low humid condition. Patent document <CIT> discloses a preservation house comprising an oxygen-enriching membrane module which is installed in a lid body capable of hermetically sealing a vegetable container housed in a vegetable chamber. A pump connected to the membrane module sucks the atmosphere in the vegetable container, a discharge port discharges the sucked gas into a cold air convection passage installed on the outer periphery of the vegetable container, a discharge duct directly leads cold air from a cooler to the vegetable container and discharges the cold air. A cold air suction port sucks the cold air circulating through the interior of the cold air convection passage, and a suction duct leads the sucked cold air to the cooler. Patent document <CIT> discloses a refrigerator comprising an oxygen reduction room and an oxygen reduction device for reducing oxygen of the oxygen reduction room. The oxygen reduction device comprises a poly-electrolyte film within an insulation case, an anode layer installed on one side of the poly-electrolyte film, a cathode layer which is installed on the other side of the poly-electrolyte film and is connected to the oxygen reduction room, a first collector which applies an electric current to the anode layer, a second collector which applies an electric current to the cathode layer, and a feeder installed on the anode layer side. Patent document <CIT> discloses a refrigeration device for a container which comprises a gas supply device that supplies nitrogen-enriched air, an air intake duct that guides outside air to a primary space on the intake side of an internal fan, and an exhaust duct that guides air from a secondary space on the discharge side of the internal fan to a space on the outside of the container.

An objective of the present invention is to provide a simple air-conditioning freshness-keeping refrigerator.

A further objective of the present invention is to improve a storage effect of articles in the refrigerator.

In particular, the present invention provides a refrigerator according to the appended set of claims.

The air-conditioning membrane assembly allows more oxygen than nitrogen in the freshness-keeping space to pass through the air-conditioning membrane and enter the oxygen-rich gas collection chamber, and the gas in the oxygen-rich gas collection chamber is pumped out of the freshness-keeping space through the air pump, such that the actual content of oxygen in the freshness-keeping space is in the range of <NUM>% to <NUM>%. This oxygen content range is a suitable interval for air-conditioning freshness-keeping of food, such that the actual content of oxygen in the freshness-keeping space is in the above-mentioned suitable range, which can effectively reduce the aerobic respiration intensity of the food while ensuring the basic respiration function, and avoid the anaerobic respiration of the food. Therefore, the storage effect of the foodtuff is improved, and the shelf life of the food is prolonged.

The oxygen sensor is arranged in the freshness-keeping space to monitor the actual content of oxygen in the freshness-keeping space. The oxygen content is used as an air-regulating standard, and a communication state between the air pump and the oxygen-rich gas collection chamber is switched by the pipeline switching mechanism, to ensure that the actual content of oxygen in the freshness-keeping space is in the range of <NUM>% to <NUM>%, thereby ensuring the freshness-keeping effect of the foodtuff. Moreover, the air pump assembly is arranged in the compressor chamber, without occupying other places additionally. Therefore, the volume of the refrigerator will not be additionally increased, and the structure of the refrigerator can be made compact.

The above and other objectives, advantages and features of the present invention will be understood by those skilled in the art more clearly according to the detailed description of the specific embodiments of the present invention below with reference to the accompanied drawings.

Some specific embodiments of the present invention will be described below in detail in an exemplary rather than restrictive manner with reference to the accompanying drawings. The same reference signs in the accompanying drawings represent the same or similar components or parts. Those skilled in the art shall understand that these drawings may not be necessarily drawn according to the scales. In the drawings:.

This embodiment provides a refrigerator, which can achieve an air-conditioning freshness-keeping function by regulating the content of oxygen in a freshness-keeping space. <FIG> is a schematic structural diagram of a refrigerator <NUM> according to an embodiment of the present invention. <FIG> is a partially schematic structural diagram of the refrigerator <NUM> according to an embodiment of the present invention. <FIG> is a schematic structural diagram of the structure shown in <FIG> from another perspective. <FIG> is a schematic structural diagram of a sealed drawer <NUM> in the refrigerator <NUM> according to an embodiment of the present invention. <FIG> is a schematic exploded view of the sealed drawer <NUM> shown in <FIG>. <FIG> is a schematic structural diagram in which the sealed drawer <NUM> is connected with an air pump <NUM> in the refrigerator according to a further embodiment of the present invention. As shown in <FIG>, the refrigerator <NUM> comprises a refrigerator body <NUM>, a door body, an air-conditioning membrane assembly <NUM> and an air pump assembly <NUM>.

The refrigerator body <NUM> defines a storage space <NUM> and a compressor chamber <NUM> therein. The number and structure of the storage space <NUM> may be configured as needed. <FIG> shows a case where a first space, a second space and a third space are arranged vertically in sequence. The storage spaces may be configured as a refrigerating space, a freezing space, a temperature changing space or a freshness-keeping space according to different purposes. Each storage space may be divided into a plurality of storage areas by partition plates, and articles may be stored using shelves or drawers. A storage container is arranged in the storage space of this embodiment, and defines the freshness-keeping space therein. As shown in <FIG>, the storage container may be a sealed drawer <NUM> that defines the freshness-keeping space. In some alternative embodiments, said freshness-keeping space may also be defined by a sealed case, a sealed can, a sealed box, or the like.

The door body is arranged on the front surface of the refrigerator body <NUM> to close the storage space <NUM>. The door body may correspond to the storage space, that is, each storage space corresponds to one or more door bodies. The number of the storage spaces or door bodies and the functions of the storage spaces may be actually selected according to specific conditions. The refrigerator <NUM> of this embodiment is provided with a first door body <NUM>, a second door body <NUM> and a third door body <NUM> respectively corresponding to the first space, the second space and the third space which are arranged vertically in sequence. The door body may be pivotally arranged on the front surface of the refrigerator body, or may be opened as well in a drawer form to realize a drawer type storage space. The drawer type storage space is often provided with metal slides to ensure gentle opening and closing of the drawer and to reduce the noise. The first space of the refrigerator <NUM> of this embodiment may be opened in a pivoting manner. The second space and the third space may be opened in a drawer form respectively.

An air-conditioning membrane assembly <NUM> is provided with at least one air-conditioning membrane and an oxygen-rich gas collection chamber, and configured to allow more oxygen than nitrogen in airflow in the surrounding space of the air-conditioning membrane assembly <NUM> to pass through the air-conditioning membrane and enter the oxygen-rich gas collection chamber. The air-conditioning membrane assembly <NUM> is mounted to the storage container, and the surrounding space of the air-conditioning membrane assembly is communicated with the freshness-keeping space. In this embodiment, the air-conditioning membrane assembly <NUM> may be mounted to the sealed drawer <NUM>.

The air pump assembly <NUM> is arranged in the compressor chamber <NUM> and comprises an air pump <NUM>. Since the oxygen-rich gas collection chamber is arranged in the sealed drawer <NUM>, and <FIG> shows a schematic diagram in which the air pump <NUM> is connected with the sealed drawer <NUM>, the air pump <NUM> is substantially communicated with the oxygen-rich gas collection chamber arranged in the sealed drawer <NUM>. An inlet end of the air pump <NUM> is communicated with the oxygen-rich gas collection chamber in a controlled manner via a pipeline <NUM> and a pipeline switching mechanism <NUM> to pump gas in the oxygen-rich gas collection chamber to the outside of the freshness-keeping space, such that the actual content of oxygen in the freshness-keeping space is in a range of <NUM>% to <NUM>%. Since more oxygen than nitrogen enters the oxygen-rich gas collection chamber through the air-conditioning membrane, a gas in the oxygen-rich gas collection chamber is generally an oxygen-rich gas. The gas is then exhausted out of the freshness-keeping space to reduce the content of oxygen in the freshness-keeping space, such that the oxygen content is caused to be equal to or less than <NUM>%.

The refrigerator <NUM> further comprises an oxygen sensor arranged in the freshness-keeping space to monitor the actual content of oxygen in the freshness-keeping space. In addition, the air pump assembly <NUM> is further configured to drive the pipeline switching mechanism <NUM> to communicate the pipeline from the inlet end of the air pump <NUM> to the freshness-keeping space when the actual content of oxygen in the freshness-keeping space is greater than <NUM>%, and control the air pump <NUM> to operate to pump the gas in the oxygen-rich gas collection chamber to the outside of the freshness-keeping space, such that the content of oxygen in the freshness-keeping space is in a range of <NUM>% to <NUM>%. According to different kinds of food, the oxygen content range of <NUM>% to <NUM>% may be refined, such that the gas atmosphere in the freshness-keeping space can meet the freshness-keeping needs of different kinds of food. In some embodiments, if the content of oxygen in the freshness-keeping space is equal to <NUM>% or less than <NUM>%, the pipeline switching mechanism <NUM> may close the pipeline from the inlet end of the air pump <NUM> to the freshness-keeping space, and the air pump <NUM> stops operating as well.

The freshness-keeping lives of various foods will be different depending on the difference in the content of oxygen in the freshness-keeping space, in the case of other storage conditions being the same. In addition, the content of oxygen in the freshness-keeping space is in a range of <NUM>% to <NUM>%, which is a generally suitable range for air-conditioning freshness-keeping of all kinds of food. A specific example will be introduced in the following: in the case where normal air contains about <NUM>% of oxygen (the oxygen content is <NUM>%), under certain other storage conditions, the freshness-keeping time of an apple is <NUM> days; the freshness-keeping time of grapes is <NUM> days; the freshness-keeping time of a baby cabbage is <NUM> days; the freshness-keeping time of broccoli is <NUM> days; the freshness-keeping time of a radish is <NUM> days; the freshness-keeping time of fresh lentinus edodes is <NUM> days; the freshness-keeping time of lychee is <NUM> days; the freshness-keeping time of a kiwifruit is <NUM> days; the freshness-keeping time of a strawberry is <NUM> day; and the freshness-keeping time of salmon is <NUM> days. While after part of oxygen in the freshness-keeping space is exhausted so that the content of oxygen in the freshness-keeping space is <NUM>%, in the case of other storage conditions being the same, the freshness-keeping time of an apple is <NUM> days; the freshness-keeping time of grapes is <NUM> days; the freshness-keeping time of a baby cabbage is <NUM> days; the freshness-keeping time of broccoli is <NUM> days; the freshness-keeping time of a radish is <NUM> days; the freshness-keeping time of fresh lentinus edodes is <NUM> days; the freshness-keeping time of lychee is <NUM> days; the freshness-keeping time of a kiwifruit is <NUM> days; the freshness-keeping time of a strawberry is <NUM> days; and the freshness-keeping time of salmon is <NUM> days. In the case of the oxygen content of <NUM>%, the freshness-keeping time of each of various foods is far longer than that in the case of the oxygen content of <NUM>%. When the content of oxygen in the freshness-keeping space is in a range of <NUM>% to <NUM>%, it is possible to effectively reduce the aerobic respiration intensity of food in the freshness-keeping space while the basic respiration effect of the food is ensured, and avoid the anaerobic respiration of the food, thereby ensuring the freshness-keeping effect of the food and extend the shelf life of the food. In the meantime, it is possible to assist in improving the freshness-keeping effect of the food by keeping the temperature in the freshness-keeping space within a certain range. Different food may correspond to different suitable storage temperatures. For example, a refrigerating temperature of vegetables is generally <NUM> to <NUM>, a refrigerating temperature of cold fresh meat is generally -<NUM> to <NUM>, and a freezing temperature of various foods is generally -<NUM> to -<NUM>. The freshness-keeping effects of various foods may be improved effectively by enabling the actual content of oxygen in the freshness-keeping space to be in a range of <NUM>% to <NUM>%, and by keeping the temperature in the freshness-keeping space in a suitable storage temperature range for various foods.

The air, as original intake air in the freshness-keeping space, has an oxygen content of about <NUM>%. In this embodiment, an oxygen-rich gas in the oxygen-rich gas collection chamber in the freshness-keeping space is exhausted through the air-conditioning membrane assembly <NUM> and the air pump <NUM>, such that the content of oxygen in the freshness-keeping space is reduced to <NUM>% or less. In other embodiments, it is also possible to reduce the content of oxygen in the freshness-keeping space to be <NUM>% or less by filling the freshness-keeping space with an inert gas or a gas beneficial to the freshness-keeping of food to reduce the content of oxygen in the freshness-keeping space. The gas beneficial to freshness-keeping of the food may be carbon dioxide which may inhibit the aerobic respiration process of fruits and vegetables, inhibit the processes of degradation of pectin substances and chlorophyll, etc., thereby delaying the maturity of food. The gas maturity to freshness-keeping of the food may also be nitric oxide which may regulate cell apoptosis, affect the metabolism of endogenous ethylene in vegetables and regulate the respiratory intensity of leaf stomata, thereby playing an important role in preventing the decay of food. It should be noted that the use of normal air as the original intake air in this embodiment is not intended to limit the present invention. In some other embodiments, gas components in the freshness-keeping space may be different from those of the normal air, but it is also possible to reduce the actual content of oxygen in the freshness-keeping space by pumping an oxygen-rich gas by the air-conditioning membrane assembly <NUM> and the air pump <NUM>, and by filling the freshness-keeping space with an inert gas or a gas beneficial to freshness-keeping of food.

As shown in <FIG>, the refrigerator body <NUM> may comprise a cabinet <NUM> defining the freshness-keeping space <NUM> therein. As shown in <FIG>, the sealed drawer <NUM> comprises a drawer cylinder <NUM> which has a forward opening, is fixed to the cabinet <NUM> and defines the freshness-keeping space therein; and a drawer body <NUM> slidably mounted in the drawer cylinder <NUM>, so as to be operatively withdrawn from and inserted into the drawer cylinder via the forward opening of the drawer cylinder <NUM>. The drawer cylinder <NUM> may be arranged on the lower part of the cabinet. In other embodiments, the drawer cylinder <NUM> may be arranged on the middle part or the upper part of the cabinet as well. In this embodiment, the cabinet <NUM> and the drawer cylinder <NUM> may be formed integrally, or may be formed separately and then mounted together.

A plurality of air pressure balance holes may be formed in the drawer cylinder <NUM> to communicate the storage space <NUM> to the freshness-keeping space. Each of the air pressure balance holes may be a hole of a millimeter order. For example, each of the air pressure balance holes may have a diameter of <NUM> to <NUM>. It is possible to balance pressures inside and outside the freshness-keeping space by providing a plurality of air pressure balance holes. The arrangement of the plurality of air pressure balance holes may not cause the gas in the freshness-keeping space to flow towards a larger storage space (or flow slightly or even negligibly if any), without affecting the preservation of food in the freshness-keeping space. In other embodiments, the air pressure balance holes may not be formed in the drawer cylinder <NUM>. Even so, there is still a large amount of gas in the freshness-keeping space, e.g., a large amount of nitrogen in the freshness-keeping space. Therefore, a user may open the drawer body <NUM>, without requiring strenuous effort, such that much labor is saved compared to the existing vacuum storage compartment.

The air-conditioning membrane assembly <NUM> is mounted to the storage container, and the surrounding space of the air-conditioning membrane assembly <NUM> is communicated with the freshness-keeping space. In this embodiment, the air-conditioning membrane assembly <NUM> may be mounted to the sealed drawer <NUM>. As shown in <FIG>, the air-conditioning membrane assembly <NUM> may be arranged on the drawer cylinder <NUM>, and preferably arranged on the top wall of the drawer cylinder <NUM>. Specifically, an accommodating chamber <NUM> which is communicated with the freshness-keeping space is arranged inside a top wall of the drawer cylinder <NUM> to accommodate the air-conditioning membrane assembly <NUM>. At least one first vent hole <NUM> and at least one second vent hole <NUM> spaced apart from the at least one first vent hole <NUM> are respectively formed in a wall surface between the accommodating chamber <NUM> in the top wall of the drawer cylinder <NUM> and the freshness-keeping space, to communicate the accommodating chamber <NUM> to the freshness-keeping space at different positions respectively. The first vent hole <NUM> and the second vent hole <NUM> are both small holes, and may be plural in number. In some alternative embodiments, the inside of the top wall of the drawer cylinder <NUM> has a recessed groove. The air-conditioning membrane assembly <NUM> is arranged in the recessed groove of the top wall of the drawer cylinder <NUM>.

In some embodiments of the present invention, in order to promote the flow of the gas in the freshness-keeping space and the gas in the accommodating chamber <NUM>, the refrigerator <NUM> may further include a fan <NUM> arranged in the accommodating chamber <NUM>, to drive the gas in the freshness-keeping space to flow through the at least one first vent hole <NUM>, the accommodating chamber <NUM> and the at least one second vent hole123 in sequence and then return to the freshness-keeping space. The fan <NUM> is preferably a centrifugal fan arranged at the first vent hole <NUM> in the accommodating chamber <NUM>. That is, the centrifugal fan is located above the at least one first vent hole <NUM>, and keeps an axis of rotation vertically downward. An air inlet of the centrifugal fan directly faces the first vent hole <NUM>. An air outlet of the centrifugal fan may face the air-conditioning membrane assembly <NUM>. The air-conditioning membrane assembly <NUM> is arranged above the at least one second vent hole <NUM>, such that each of the air-conditioning membranes of the air-conditioning membrane assembly <NUM> is parallel to the top wall of the drawer cylinder <NUM>. At least one first vent hole <NUM> is formed in the front part of the top wall, and at least one second vent hole <NUM> is formed in the rear part of the top wall. That is, the centrifugal fan is arranged at the front part of the accommodating chamber <NUM>, and the air-conditioning membrane assembly <NUM> is arranged at the rear part of the accommodating chamber <NUM>.

Further, the top wall of the drawer cylinder <NUM> comprises a lower plate portion <NUM> and a cover plate portion <NUM>. A recessed portion is formed in a partial area of the lower plate portion <NUM>. The cover plate portion <NUM> detachably covers the recessed portion to form the accommodating chamber <NUM>. In order to facilitate the manufacture of the drawer cylinder <NUM>, the lower plate portion <NUM> may be integrally formed with the side wall, the bottom wall, and the rear wall of the drawer cylinder <NUM>.

<FIG> is a schematic structural diagram of the air-conditioning membrane assembly in the refrigerator <NUM> according to an embodiment of the present invention. <FIG> is a schematic exploded view of the air-conditioning membrane assembly shown in <FIG>. <FIG> is a schematic structural diagram of a support frame in the air-conditioning membrane assembly shown in <FIG>. <FIG> is a schematic structural diagram of the support frame in the air-conditioning membrane assembly shown in <FIG> as observed from another perspective. In the present embodiment, the air-conditioning membrane is an oxygen-rich membrane, and the air-conditioning membrane assembly <NUM> may be an oxygen-rich membrane assembly <NUM>. The oxygen-rich membrane assembly <NUM> of this embodiment may generally comprise a support frame <NUM> and an oxygen-rich membrane <NUM> arranged on the support frame <NUM>.

In the embodiment of the present invention, the oxygen-rich membrane <NUM> is permeable to all gases, except that different gases have different degrees of permeation. Gas permeation through the oxygen-rich membrane <NUM> is a complex process. The permeation mechanism of this process generally resides in that gas molecules are first adsorbed to the surface of the oxygen-rich membrane <NUM> and dissolved, then diffused in the oxygen-rich membrane <NUM>, and finally desorbed from the other side of the oxygen-rich membrane <NUM>. The oxygen-rich membrane separation technique realizes gas separation depending on the difference in dissolution and diffusion coefficients of different gases in the oxygen-rich membrane <NUM>. When mixed gas is subjected to a certain driving force (pressure difference or pressure ratio in both sides of the oxygen-rich membrane <NUM>), gases, such as oxygen, hydrogen, helium, hydrogen sulfide, carbon dioxide and the like which have relatively high permeation rates penetrate through the oxygen-rich membrane <NUM>, and are then enriched on the permeation side of the oxygen-rich membrane <NUM>. However, gases, such as nitrogen, carbon monoxide and the like which have relatively low permeation rates are retained on the retention side of the oxygen-rich membrane <NUM> and are then enriched. Therefore, the purpose of separation of the mixed gas is achieved.

The support frame <NUM> has a first surface <NUM> and a second surface <NUM> parallel to each other. A plurality of airflow passages <NUM> which extends on the first surface <NUM> and the second surface <NUM> respectively and penetrates through the support frame <NUM> to communicate the first surface <NUM> to the second surface <NUM> are formed on the support frame <NUM>. The plurality of airflow passages <NUM> jointly forms the oxygen-rich gas collection chamber. At least one oxygen-rich membrane <NUM> may be arranged in the present embodiment. Preferably, two planar oxygen-rich membranes may be arranged, and are laid on the first surface <NUM> and the second surface <NUM> of the support frame <NUM> respectively. When the pressure inside the oxygen-rich membrane <NUM> is lower than the pressure outside thereof, the oxygen-rich membrane <NUM> may allow oxygen in air outside thereof to pass through the oxygen-rich membrane <NUM> into the oxygen-rich gas collection chamber, to form an oxygen-rich gas, such that the air outside the oxygen-rich membrane becomes a nitrogen-rich gas.

In some embodiments, the support frame <NUM> comprises a suction hole <NUM> that is communicated with at least one of the plurality of airflow passages <NUM>, to allow the oxygen-rich gas in the oxygen-rich gas collection chamber to be sucked out by the air pump <NUM>. As the oxygen-rich gas in the oxygen-rich gas collection chamber is sucked out, the oxygen-rich gas collection chamber is in a negative pressure state. Therefore, oxygen in air outside the oxygen-rich membrane assembly <NUM> will continue to pass through the oxygen-rich membrane <NUM> into the oxygen-rich gas collection chamber, such that the air outside the oxygen-rich membrane assembly <NUM> forms a nitrogen-rich atmosphere. In some embodiments, the plurality of airflow passages <NUM> formed inside the support frame <NUM> may be a plurality of cavities that is communicated with the suction hole <NUM>.

In some embodiments, referring to <FIG> and <FIG>, for further ease of installation, it is possible to pre-fasten the oxygen-rich membrane <NUM> in a mounting groove <NUM> of the support frame <NUM> by using a circle of double-sided adhesive tape <NUM>, and then fill a loop slot <NUM> of the support frame <NUM> with a circle of sealing adhesive <NUM>, such that the oxygen-rich membrane <NUM> is mounted in the mounting groove <NUM> of the support frame <NUM> in a sealed manner.

The inlet end of the air pump <NUM> is communicated with the oxygen-rich gas collection chamber in the freshness-keeping space via the pipeline <NUM> and the pipeline switching mechanism <NUM>, and concretely, may be communicated with the suction hole <NUM>. The air pump <NUM> is configured to suck air outwards through the suction hole <NUM>, such that the pressure in the oxygen-rich gas collection chamber is lower than the pressure of the freshness-keeping space. That is to say, as the air pump <NUM> sucks air outwards, the air in the freshness-keeping space may flow to the oxygen-rich membrane assembly. Under the action of the oxygen-rich membrane assembly, some or all of oxygen in the air in the freshness-keeping space enters the oxygen-rich gas collection chamber and is then exhausted out of the freshness-keeping space through the pipeline <NUM> and the air pump <NUM>, such that a gas atmosphere which is rich in nitrogen and deficient in oxygen to facilitate the freshness-keeping of food may be obtained in the freshness-keeping space.

The oxygen-rich membrane assembly allows oxygen in air to preferentially pass through the oxygen-rich membrane to obtain oxygen under the driving of a pressure difference by using the difference in permeation rates of various gas components in air that pass through the oxygen-rich membrane. In some other embodiments, the air-conditioning membrane may also be a hollow fiber membrane. The air-conditioning membrane assembly is configured as a hollow fiber membrane assembly. The hollow fiber membrane assembly allows oxygen molecules to preferentially penetrate through the hollow fiber membrane to obtain oxygen since the oxygen molecules are smaller than nitrogen molecules, by using the difference in permeation rates of various gas components in the air that pass through the hollow fiber membrane.

<FIG> is a schematic exploded view of an air pump assembly <NUM> in the refrigerator <NUM> according to the present invention. As shown in <FIG>, the air pump assembly <NUM> further comprises a mounting base plate <NUM> and a sealed case <NUM>. The mounting base plate <NUM> is mounted to the bottom surface of the compressor chamber <NUM> through a plurality of damping foot pads <NUM>. The sealed case <NUM> is mounted to the mounting base plate <NUM>. The air pump <NUM> is mounted in the sealed case <NUM>. That is, the air pump <NUM> is arranged inside the sealed case <NUM>, and the sealed case <NUM> is mounted in the compressor chamber <NUM> through the mounting base plate <NUM>. When the air pump <NUM> is in operation, the sealed case <NUM> may greatly prevent noise and/or waste heat from propagating outwards. Further, in order to improve the damping and noise reduction effects, a plurality of damping foot pads <NUM> (which may be made of rubber) may also be mounted on the mounting base plate <NUM>. The number of the damping foot pads <NUM> may be preferably four. The four damping foot pads <NUM> are mounted in foot pad mounting holes formed in four corners of the mounting base plate <NUM>.

In some embodiments of the present invention, a mounting frame is arranged inside the sealed case <NUM>. The mounting frame is connected to the inner wall of the sealed case <NUM> by a plurality of damping blocks. The air pump <NUM> is fixed inside the mounting frame, so as to reduce the vibration and noise when the air pump <NUM> is in operation. Specifically, the bottom of the mounting frame is provided with two damping blocks which is sleeved on positioning posts on the bottom surface of the sealed case <NUM>. One circular damping block is arranged on each of two opposite sides of the mounting frame, and is clamped in a clamping slot of the corresponding side wall of the sealed case <NUM>. One damping block is fixed to each of the other two opposite sides of the mounting frame. The air pump <NUM> may be located between the respective damping blocks in the sealed case <NUM> and fastened to the mounting frame by screws.

A refrigeration system of the refrigerator <NUM> may be a refrigeration cycle system composed of a compressor, a condenser, a throttle device, an evaporator, and the like. The compressor is mounted in the compressor chamber <NUM>. The evaporator is configured to supply a cooling capacity directly or indirectly into the storage space <NUM>. For example, when the refrigerator is a household compression type directly-cooled refrigerator, the evaporator may be arranged on the outside or inside of the rear wall surface of the cabinet. When the refrigerator is a household compression type air-cooled refrigerator, the refrigerator <NUM> further has an evaporator chamber inside. The evaporator chamber is communicated with the storage space <NUM> through an air passage system. In addition, an evaporator is arranged inside the evaporator chamber. A fan is arranged at an outlet of the evaporator chamber to perform circulation cooling for the storage space <NUM>.

In some embodiments of the present invention, the air pump <NUM> is arranged at one end of the compressor chamber <NUM>, and the compressor may be arranged at the other end of the compressor chamber <NUM>, such that the air pump <NUM> is away from the compressor, thereby reducing nose superposition and waste heat superposition. For example, the air pump <NUM> may be arranged at one end, adjacent to the pivoting side of the door body, of the compressor chamber <NUM>. When the refrigerator is a side-by-side refrigerator, the air pump <NUM> may be arranged at either end of the compressor chamber <NUM>. In still other embodiments of the present invention, the air pump <NUM> is arranged adjacent to the compressor. The air pump <NUM> is arranged at one end of the compressor chamber <NUM>, and located between the compressor and the side wall of the compressor chamber <NUM>. The air pump <NUM> is arranged in the compressor chamber <NUM>, and can fully make use of the space in the compressor chamber, without occupying other places additionally, such that the volume of the refrigerator may not be additionally increased, and the structure of the refrigerator can be made compact.

In the refrigerator <NUM> according to this embodiment, the air-conditioning membrane assembly allows more oxygen than the nitrogen in the freshness-keeping space to pass through the air-conditioning membrane to enter the oxygen-rich gas collection chamber, and the gas in the oxygen-rich gas collection chamber is pumped to the outside of the freshness-keeping space through the air pump <NUM>, such that the actual content of oxygen in the freshness-keeping space is in a range of <NUM>% to <NUM>%. This oxygen content range is a suitable interval for air-conditioning freshness-keeping of foodtuff, such that the content of oxygen in the freshness-keeping space is in the above-mentioned range, which can effectively reduce the aerobic respiration intensity of the food while ensuring the basic respiration function, and avoid the anaerobic respiration of the food. Therefore, the storage effect of the foodtuff is improved, and the shelf life of the food is prolonged.

Claim 1:
A refrigerator, comprising:
a refrigerator body (<NUM>), a door body, an air-conditioning membrane assembly and an air pump assembly, wherein the refrigerator body defines a storage space (<NUM>) and a compressor chamber therein, a storage container is arranged in the storage space (<NUM>), and a freshness-keeping space is defined inside the storage container;
the door body is arranged on the front surface of the refrigerator body to close the storage space;
the air-conditioning membrane assembly (<NUM>) is mounted to the storage container, and the surrounding space of the air-conditioning membrane assembly is communicated with the freshness-keeping space, the air-conditioning membrane assembly comprises at least one air-conditioning membrane and an oxygen-rich gas collection chamber, and is configured to allow more oxygen than nitrogen in airflow in a surrounding space of the air-conditioning membrane assembly (<NUM>) to pass through the air-conditioning membrane and enter the oxygen-rich gas collection chamber;
the air pump assembly is arranged inside the compressor chamber, and the air pump assembly comprises an air pump, wherein an inlet end of the air pump is communicated with the oxygen-rich gas collection chamber in a controlled manner via a pipeline and a pipeline switching mechanism, for pumping gas in the oxygen-rich gas collection chamber to the outside of the freshness-keeping space, such that the actual content of oxygen in the freshness-keeping space is in a range of <NUM>% to <NUM>%;
characterized in that the air pump assembly (<NUM>) further comprises:
a mounting base plate (<NUM>) mounted to the bottom surface of the compressor chamber (<NUM>) through a plurality of damping foot pads (<NUM>); and
a sealed case (<NUM>) mounted to the mounting base plate (<NUM>), the air pump (<NUM>) being mounted in the sealed case (<NUM>).