Patent Description:
An oxygen removal module has been used in refrigeration and preservation devices such as refrigerators, and is capable of consuming oxygen in a storage space, thus forming an environment with low oxygen in the storage space. The low oxygen environment can effectively inhibit respiration of fruits and vegetables, thus reducing the consumption of organic substances; and can also make cells of the fruits and vegetables breathe slowly, thus maintaining the vitality of the cells, and keeping the excellent flavor and aroma of the fruits and vegetables. The low oxygen environment can also inhibit the activity of some enzymes and the production of ethylene, thus delaying ripening and senescence processes, and the nutrition and freshness of fruits can be remained for a long time. In addition, the low oxygen environment can also effectively inhibit the breeding of aerobic bacteria, thus preventing the spoilage of the fruits and vegetables.

The oxygen removal module includes an anode, a cathode and an electrolyte tank. The electrolyte tank stores an electrolyte used for reaction, and the cathode is contacted with air in the storage space. During operation, the cathode consumes oxygen in the storage space, and the anode produces oxygen, when the oxygen escapes, water may be taken away, resulting in the reduction of a water amount in the electrolyte tank. Thus, after a long-term operation, the electrolyte tank will be faced with water shortage. <CIT> relates generally to a refrigerator capable of preventing deterioration in a polymer electrolyte membrane. <CIT> relates generally to a hydrogen water refrigerator that refrigerates food and generates and provides hydrogen water. <CIT> relates generally to a module with a PEM electrolysis cell for generating a gas that can be fed to a food storage container that can be connected to the module.

The invention is specified in the independent claim <NUM>. In the following, each of the described methods, apparatuses, embodiments, examples, and aspects, which do not fully correspond to the invention as defined in the claims is thus not according to the invention and is, as well as the whole following description, present for illustration purposes only or to highlight specific aspects or features of the claims. Embodiments not falling under the scope of the claims should be interpreted as examples useful for understanding the invention. The present disclosure aims to solve at least one of the problems in the prior art. Therefore, in one aspect, the present disclosure provides an oxygen removal module, in which a water tank capable of meeting a service cycle and supplementing water for the oxygen removal module is adopted, and thus the defect of water shortage in the electrolyte tank is solved, even after a long-term operation of the oxygen removal module. According to the present invention a refrigerator is provided with a fresh-keeping device comprising an oxygen removal module.

An oxygen removal module according to the present invention includes: an electrolyte tank provided with a water inlet; and a water tank provided with a water outlet, and the water outlet is connected to the water inlet, to supplement water to the electrolyte tank through the water tank.

The oxygen removal module according to the embodiment of the present disclosure at least has the following beneficial effects: the water tank is provided to connect with the electrolyte tank and water in the water tank can be injected into the electrolyte tank, and a liquid level in the electrolyte tank will be maintained in a normal range. Since the water tank has a predetermined volume to pre-store water for the oxygen removal module to serve a longer, thus solving a problem of water supplementation of the oxygen removal module in the prior art. Thus, the defect of water shortage in the electrolyte tank is solved, even after a long-term operation of the oxygen removal module.

According to some embodiments of the present disclosure, the electrolyte tank is provided with a first air pressure balance port, the water tank is provided with a second air pressure balance port, and the first air pressure balance port is connected to the second air pressure balance port, to keep air pressures in the water tank and the electrolyte tank balanced.

According to some embodiments of the present disclosure, the water outlet is connected to the water inlet through a pipeline, and the first air pressure balance port is connected to the second air pressure balance port through a pipeline.

According to some embodiments of the present disclosure, the water tank is provided with a water feeding port, and a sealing structure capable of plugging the water feeding port is mounted on the water feeding port.

The electrolyte tank is provided with an oxygen exhaust hole, and the exhaust hole is provided with an anti-toppling leakage structure.

The anti-toppling leakage structure includes: an exhaust passage arranged in the electrolyte tank along a vertical direction, where one end of the exhaust passage is connected to the exhaust hole, and the other end of the exhaust passage is communicated with the electrolyte tank; a floating ball arranged in the exhaust passage, where a gap is formed between the floating ball and the exhaust passage, a diameter of the floating ball is larger than an inner diameter of the exhaust hole and the floating ball is capable of blocking the exhaust hole; and a stopping portion arranged at the end of the exhaust passage communicating with the electrolyte tank, to prevent the floating ball from falling from the exhaust passage.

An inner wall of the exhaust passage is provided with exhaust grooves along an axial direction.

According to some embodiments of the present disclosure, the end of the exhaust passage connected with the exhaust hole is arranged in an arc shape matched with a correspondingly contacted spherical surface of the floating ball.

According to some embodiments of the present disclosure, a diameter of the exhaust passage is gradually reduced from bottom to top.

According to some embodiments of the present disclosure, a top portion of the electrolyte tank is provided with a pressure release valve.

A fresh-keeping device according to the present invention includes: a frame provided with an accommodating space, where one side of the frame is provided with an opening, a wall of the frame is provided with a vent hole, and the vent hole is communicated with the accommodating space; a drawer accessible and containable in the accommodating space through the opening, to form a closed storage space with the frame; and any one of oxygen removal modules above, where the electrolyte tank of the oxygen removal module is arranged at the vent hole of the frame, to consume oxygen inside the storage space, thus reducing an oxygen content in the storage space.

The fresh-keeping device according to the embodiment of the present disclosure at least has the following beneficial effects: the fresh-keeping device provided by the present disclosure includes the oxygen removal module according to any one of the embodiments above, thus having all the beneficial effects of the oxygen removal module according to any one of the embodiments, which will not be exemplified herein.

According to some embodiments of the present disclosure, the frame includes: an inner frame, where the accommodating space is arranged within the inner frame, the opening is arranged on one side of the inner frame, the vent hole is arranged in a side wall of the inner frame far away from the opening, and the water tank is arranged at an upper side wall of the inner frame; and an outer frame arranged on the inner frame, where the electrolyte tank is arranged between the inner frame and the outer frame.

According to some embodiments of the present disclosure, the electrolyte tank is detachably arranged on the inner frame through a first fixing structure, and the water tank is detachably arranged on the inner frame through a second fixing structure.

According to some embodiments of the present disclosure, the first fixing structure includes: a first connecting column arranged on the side wall of the inner frame, where a first connecting hole is arranged in the first connecting column; a first stepped hole arranged at a corresponding position of the electrolyte tank, where the first connecting column passes through the first stepped hole; and a first fixed connecting member passing through the first stepped hole and threadedly connected to the first connecting hole.

According to some embodiments of the present disclosure, the second fixing structure includes: a second connecting column arranged on the upper side wall of the inner frame, where a second connecting hole is arranged in the second connecting column; a second stepped hole arranged at a corresponding position of the water tank, where the second connecting column passes through the second stepped hole; and a second fixed connecting member passing through the second stepped hole and threadedly connected to the second connecting hole.

According to some embodiments of the present disclosure, a sealing strip is arranged between the opening and the drawer, to ensure a sealing performance between the opening and the drawer.

According to some embodiments of the present disclosure, vent holes are provided, and vent holes are arranged on the side wall of the frame in an array.

A refrigerator according to the present disclosure includes the fresh-keeping device according to any one of the embodiments above.

The refrigerator according to the embodiment of the present disclosure at least has the following beneficial effects: the refrigerator provided by the present disclosure includes the oxygen removal module according to any one of the embodiments above, thus having all the beneficial effects of the oxygen removal module according to any one of the embodiments above, which will not be exemplified herein.

Some of the additional aspects and advantages of the present disclosure will be explained in the following description, which can become apparent from the following description or be understood through practice of the present disclosure.

The above and/or additional aspects and advantages of the present disclosure will become apparent and easy to understand from the description of embodiments in conjunction with the following drawings, where:.

Embodiments of the present disclosure are described below in detail, illustrations of which are shown in the accompanying drawings, where identical or similar reference numerals denote identical or similar elements or elements having the same or similar functions. The embodiments described below by reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure.

In the description of the present disclosure, it should be understood that any orientation/position related description, such as the orientational or positional relationship, such as, up, down, front, rear, left, right, and the like, is based on the orientational or positional relationship shown in the accompanying drawings, is only for the purpose of facilitating the description of the present disclosure and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation or position, be constructed and operated in a specific orientation or position, and therefore shall not be understood as a limitation to the present disclosure.

In the description of the present disclosure, if there are terms, such as "first" and "second", there are only for the purpose of distinguishing features, and shall not be understood as indicating or implying relative importance or implying the number of indicated features or implying the order of indicated features.

In the description of the present disclosure, words such as arrangement, installation, and connection shall be understood in a broad sense unless otherwise specified. The specific meaning of the above words in the present disclosure with reference to the context of the disclosure.

As shown in <FIG>, an oxygen removal module <NUM> in the present invention is used in a refrigerator for removing oxygen and retaining freshness. The refrigerator <NUM> may refer to a refrigeration storage device in a broad sense, such as an electric refrigerator, an electric freezer, and a refrigerated cabinet, and so on.

With reference to <FIG>, the oxygen removal module <NUM> according to the present invention includes an electrolyte tank <NUM> and a water tank <NUM>. The electrolyte tank <NUM> is used for storing an electrolyte. The electrolyte tank <NUM> is provided with a water inlet <NUM>, and the water inlet <NUM> is communicated with an inner cavity of the electrolyte tank <NUM>. The water tank <NUM> is provided with a water outlet <NUM>, the water outlet <NUM> is arranged at a position near to a bottom portion of the water tank <NUM>. And the water outlet <NUM> is communicated with an inner cavity of the water tank <NUM>. The water outlet <NUM> is connected to the water inlet <NUM> through a first pipeline <NUM>, and the water tank can supplement water to the electrolyte tank <NUM>.

It can be understood that, in order to supplement water to the electrolyte tank <NUM> through the water outlet <NUM> and the water inlet <NUM>, the water outlet <NUM> has a height higher than that of the water inlet <NUM>. In another embodiment, under a condition that a difference between a liquid level of the water tank <NUM> and the height of the water inlet <NUM> is larger than a height difference between the water outlet <NUM> and the water inlet <NUM>, the height of the water outlet <NUM> may also be set to be lower than that of the water inlet <NUM>, to supplement water to the electrolyte tank <NUM> through a water pressure.

A cathode electrode and an anode electrode (not shown in the drawings) are arranged inside the oxygen removal module <NUM>. The cathode electrode is contacted with air through a waterproof air-permeable film. An operating principle of the oxygen removal module <NUM> is that: oxygen in air permeates through the waterproof air-permeable film to enter the electrolyte tank <NUM>, while nitrogen in air is blocked outside the electrolyte tank <NUM> by the waterproof air-permeable film at the same time, and the oxygen will have an electrochemical reaction with water under an action of the cathode to produce hydroxide ions. Meanwhile, an electrochemical reaction occurs at the anode, and the hydroxide ions subjected to the reaction produce water and oxygen, to replace the oxygen in air and exhaust the oxygen out of the oxygen removal module <NUM> through an exhaust hole <NUM>, thus reducing an oxygen content in a drawer, and then achieving a fresh-keeping effect.

During operation of the oxygen removal module <NUM>, a part of water may be taken away by the exhausted oxygen, and water in the electrolyte in the electrolyte tank <NUM> is gradually reduced, thus affecting normal operation of the oxygen removal module <NUM>. Therefore, it is necessary for a customer to supplement water regularly. When the oxygen removal module <NUM> according to the embodiment of the present disclosure is used, since the water tank <NUM> has a predetermined volume, the water tank <NUM> may be added with enough water to cover a long use cycle of the oxygen removal module <NUM>. The water in the water tank <NUM> may be supplemented to the electrolyte tank <NUM> through the first pipeline <NUM>, and a liquid level in the electrolyte tank <NUM> is maintained in a normal range, thus solving a problem of water supplementation of the oxygen removal module. Thus, the defect of water shortage in the electrolyte tank <NUM> is solved, even after a long term operation of the oxygen removal module <NUM>.

With reference to <FIG>, in some embodiments of the present disclosure, the electrolyte tank <NUM> is provided with a first air pressure balance port <NUM>, and the first air pressure balance port <NUM> is communicated with a space above an electrolyte level in the inner cavity of the electrolyte tank <NUM>. The water tank <NUM> is provided with a second air pressure balance port <NUM>, and the second air pressure balance port <NUM> is communicated with a space above a liquid level in the water tank <NUM>. The first air pressure balance port <NUM> is connected to the second air pressure balance port <NUM> through a second pipeline <NUM>, to keep air pressures in the water tank <NUM> and the electrolyte tank <NUM> balanced.

A large pressure may be produced if gas produced by the oxygen removal module <NUM> cannot be exhausted in time, and an electrolytic film of the oxygen removal module <NUM> may be destroyed, and the water in the water tank <NUM> may be unable to flow into the electrolyte tank <NUM> smoothly. Therefore, in the embodiment, the air pressure balance ports are arranged in the electrolyte tank <NUM> and the water tank <NUM> with a pipeline connected in between, to realize air pressure balance between the water tank <NUM> and the electrolyte tank <NUM>, thus preventing the electrolytic film of the oxygen removal module <NUM> from being destroyed, protecting the oxygen removal module <NUM>, and being convenient for the water in the water tank <NUM> to smoothly enter the electrolyte tank <NUM> at the same time.

As shown in <FIG>, in some embodiments, the first air pressure balance port <NUM> is located above the water inlet <NUM> and located in an upper portion of the electrolyte level, and the second air pressure balance port <NUM> is located above the water outlet <NUM> and located in an upper portion of the liquid level in the water tank, to ensure communication between the space above the liquid level in the water tank <NUM> and the space above the electrolyte level in the inner cavity of the electrolyte tank <NUM>, thus realizing air pressure balance between the water tank <NUM> and the electrolyte tank <NUM>.

It can be understood that, in some embodiments, the first air pressure balance port <NUM> may be arranged in the electrolyte tank <NUM> below the electrolyte level, an interior of the electrolyte tank <NUM> is connected to the first air pressure balance port <NUM> through a pipeline, and an outlet of the pipeline is arranged above the electrolyte level. Similarly, the second air pressure balance port <NUM> may be arranged in the water tank <NUM> below the liquid level, an interior of the water tank <NUM> is connected to the second air pressure balance port <NUM> through a pipeline, and an outlet of the pipeline is higher than the liquid level in the water tank <NUM>. In such an embodiment, the communication between the space above the liquid level in the water tank <NUM> and the space above the electrolyte level in the inner cavity of the electrolyte tank <NUM> is ensured, thus realizing air pressure balance between the water tank <NUM> and the electrolyte tank <NUM>.

In some embodiments, the first pipeline <NUM> and the second pipeline <NUM> are flexible pipelines. The connection by the flexible pipelines facilitates separation between the water tank <NUM> and the oxygen removal module <NUM>, and after the electrolyte tank <NUM> or the water tank <NUM> is damaged, the electrolyte tank <NUM> or the water tank <NUM> may be replaced separately, thus reducing a maintenance cost.

With reference to <FIG>, in some embodiments, the water tank <NUM> is provided with a water feeding port (not shown in the drawings), and a sealing structure capable of plugging the water feeding port is mounted on the water feeding port, and it is convenient for water feeding during production. And it is convenient for a customer to add water to the water tank <NUM> after the water in the water tank <NUM> is used up.

As shown in <FIG>, in some embodiments, the sealing structure may be a water tank cover <NUM> arranged on the water feeding port, the water tank cover <NUM> is connected to the water feeding port through a thread, and a leakage-proof gasket (not shown in the drawings) is mounted in the water tank cover <NUM>, to prevent water evaporation or leakage.

In some embodiments, the water tank cover <NUM> may also be connected to the water feeding port in a known way, such as snap-fit connection, which will not be described in detail herein.

It can be understood that, the sealing structure may also be a valve connected to the water feeding port through a pipeline. The valve may be a one-way valve, a stop valve and the like.

With reference to <FIG> and <FIG>, according to the present invention, the electrolyte tank <NUM> is provided with an oxygen exhaust hole <NUM>, and after the oxygen removal module <NUM> replaces the oxygen from air, the oxygen may be exhausted through the exhaust hole <NUM>, to maintain the air pressure in the electrolyte tank <NUM> in a normal state. The exhaust hole <NUM> is provided with an anti-toppling leakage structure <NUM>, which may prevent the electrolyte of the oxygen removal module <NUM> from leaking when the refrigerator <NUM> topples during transportation, thus preventing the refrigerator <NUM> from being corroded by the leaked electrolyte.

With reference to <FIG>, according to the present invention, the anti-toppling leakage structure <NUM> includes an exhaust passage <NUM>, a floating ball <NUM> and a stopping portion <NUM>. The exhaust passage <NUM> is arranged in the electrolyte tank <NUM> along a vertical direction, where one end of the exhaust passage <NUM> is connected to the exhaust hole <NUM>, and the other end of the exhaust passage is communicated with the electrolyte tank <NUM>. The floating ball <NUM> is arranged in the exhaust passage <NUM>, where a gap is formed between the floating ball <NUM> and the exhaust passage <NUM>. A diameter of the floating ball <NUM> is larger than an inner diameter of the exhaust hole <NUM>, and the floating ball <NUM> is capable of blocking the exhaust hole <NUM>. The stopping portion <NUM> is arranged at the end of the exhaust passage <NUM> communicated with the electrolyte tank <NUM>, to prevent the floating ball <NUM> from falling from the exhaust passage <NUM>.

It can be understood that, in some embodiments, in order to meet a requirement that the floating ball <NUM> is capable of blocking the exhaust hole <NUM> in the case of toppling of the oxygen removal module <NUM>, it is necessary to consider a relationship between a gravity of the floating ball, a buoyancy of the electrolyte to the floating ball and a surface tension of the electrolyte to the floating ball. Experiments have proved that, materials simultaneously meeting conditions that a density of the floating ball is less than <NUM>×<NUM><NUM> kg/m<NUM>, a radius of the floating ball is greater than <NUM> and there is no reaction with the electrolyte may all be used as materials of the floating ball, such as a PP material.

As shown in <FIG>, in some embodiments, the stopping portion <NUM> is three stopping ribs extending along a radial direction of the exhaust passage <NUM> to an axial direction of the exhaust passage <NUM>. The three stopping ribs are uniformly arranged on an inner circumference of the exhaust passage <NUM>, and the stopping ribs are integrally formed with the exhaust passage <NUM>. In some embodiments, one, two or more stopping ribs may also be provided, and the stopping portion <NUM> may also be separately arranged from the exhaust passage <NUM>, and fixed on the exhaust passage <NUM> through a fixing member, which may also achieve the purpose of preventing the floating ball from falling from the exhaust passage.

<FIG> and <FIG> show a schematic structural diagram of the anti-toppling leakage structure in the embodiment above in the case of normal operation of the oxygen removal module. As shown in the drawings, the electrolyte tank <NUM> is provided with an upper cover <NUM>, and the exhaust hole <NUM> is arranged in the upper cover <NUM>. The floating ball <NUM> falls on the stopping portion <NUM> under the gravity of the floating ball itself. And the oxygen is exhausted out of the oxygen removal module <NUM> through the gap between the floating ball <NUM> and the exhaust passage <NUM>.

<FIG>, <FIG> show a schematic structural diagram of the anti-toppling leakage structure in the case of inverse arrangement of the oxygen removal module. As shown in the drawings, when the refrigerator <NUM> or the oxygen removal module <NUM> topples during transportation or conveying, the floating ball <NUM> blocks the exhaust hole <NUM> under the gravity of the floating ball itself and a pressure of a solution, to prevent the solution from leaking out of the module.

With reference to <FIG>, according to the present invention, an inner wall of the exhaust passage <NUM> is provided with three exhaust grooves <NUM> along an axial direction. And one of the main purposes of the exhaust grooves <NUM> is used to increase the gas exhaust passage after the floating ball <NUM> falls on the stopping portion <NUM>, thus increasing an exhaust amount. One end of each of the exhaust grooves <NUM> is communicated with the electrolyte tank <NUM>, and lengths of the exhaust grooves <NUM> are shorter than that of the exhaust passage <NUM>, to prevent the electrolyte from leaking out of the module from the exhaust grooves <NUM> when the floating ball <NUM> blocks the exhaust hole <NUM>.

In some embodiments, one, two or more exhaust grooves <NUM> may also be provided according to an actual situation.

With reference to <FIG>, <FIG>, in some embodiments, the end of the exhaust passage <NUM> connected with the exhaust hole <NUM> is arranged in an arc shape matched with a correspondingly contacted spherical surface of the floating ball <NUM>, to prevent a space between the floating ball <NUM> and the exhaust hole <NUM> when the floating ball <NUM> blocks the exhaust hole <NUM>, thus improve a reliability of blocking the exhaust hole <NUM> by the floating ball <NUM>.

With reference to <FIG>, <FIG>, in some embodiments, a diameter of the exhaust passage <NUM> is gradually reduced from bottom to top, and the floating ball <NUM> is capable of normally falling on the stopping portion when the oxygen removal module <NUM> is used, and it is convenient for the floating ball <NUM> to smoothly falling back to the stopping portion <NUM> when the oxygen removal module <NUM> is restored from a toppling state to a normal state.

It can be understood that, in embodiments not covered by the present claimed invention, the anti-toppling leakage structure <NUM> may also be a waterproof air-permeable film mounted in the exhaust hole <NUM> and other structures, which may also achieve the purpose of preventing the electrolyte of the oxygen removal module <NUM> from leaking and preventing the refrigerator from being corroded by the leaked electrolyte.

With reference to <FIG>, in some embodiments, a top portion of the electrolyte tank <NUM> is provided with a pressure release valve <NUM>. An opening pressure of the pressure release valve <NUM> may be set according to a safety pressure of the oxygen removal module <NUM>. When the exhaust hole <NUM> of the oxygen removal module <NUM> is blocked and a pressure in the electrolyte tank <NUM> reaches the safety pressure of the oxygen removal module <NUM>, the pressure release valve <NUM> is automatically opened to relieve the pressure, to prevent the oxygen removal module <NUM> from being damaged due to an excessively large pressure in the oxygen removal module <NUM>.

With reference to <FIG> show a fresh-keeping device <NUM> according to an embodiment in a second aspect of the present disclosure. The fresh-keeping device <NUM> shown in the drawings includes a frame <NUM>, a drawer <NUM> and the oxygen removal module <NUM> provided by any one of the embodiments above.

As shown in the drawings, the frame <NUM> is provided with an accommodation space <NUM>, where one side of the frame <NUM> is provided with an opening <NUM>, a wall of the frame <NUM> is provided with a vent hole <NUM> (as shown in <FIG>), and the vent hole <NUM> is communicated with the accommodating space <NUM>. The drawer <NUM> is capable of accessing and being contained in the accommodating space <NUM> through the opening <NUM>, to form a closed storage space with the frame <NUM>. The electrolyte tank <NUM> of the oxygen removal module <NUM> is arranged at the vent hole <NUM> of the frame <NUM>, the waterproof air-permeable film on the oxygen removal module <NUM> is opposite to the vent hole <NUM>, and a sealing strip is arranged between the electrolyte tank <NUM> and the frame <NUM>, to prevent air outside the fresh-keeping device <NUM> from entering the oxygen removal module <NUM>. When the fresh-keeping device <NUM> is operated, oxygen in the accommodating space <NUM> may access the oxygen removal module <NUM> through the vent hole <NUM> in the frame <NUM>, and the oxygen is replaced through the oxygen removal module <NUM>, and then exhausted out of the oxygen removal module <NUM> through the exhaust hole <NUM> in the oxygen removal module <NUM>, thus reducing an oxygen content inside the drawer <NUM>, and then achieving a fresh-keeping effect.

The fresh-keeping device <NUM> provided by the embodiment of the present disclosure includes the oxygen removal module <NUM> provided by any one of the embodiments above. Therefore, the water in the water tank <NUM> may be supplemented to the electrolyte tank <NUM> through the first pipeline <NUM>, and the liquid level in the electrolyte tank <NUM> is maintained in a normal range, thus solving a problem of water supplementation of the oxygen removal module. Thus, the defect of water shortage in the electrolyte tank <NUM> is solved, even after a long-term operation of the oxygen removal module <NUM>.

With reference to <FIG>, in some embodiments, the frame <NUM> includes an inner frame <NUM> and an outer frame <NUM>. The outer frame <NUM> is arranged on the inner frame <NUM>, where the accommodating space <NUM> is arranged in the inner frame <NUM>, the opening <NUM> is arranged on one side of the inner frame <NUM>, the vent hole <NUM> is arranged in a side wall of the inner frame <NUM> far away from the opening <NUM>, and the water tank <NUM> is arranged on an upper side wall of the inner frame <NUM>. The electrolyte tank <NUM> is arranged between the inner frame <NUM> and the outer frame <NUM>, and a structure of the fresh-keeping device <NUM> is compact, thus improving an effective utilization space of the fresh-keeping device.

In some embodiments, the electrolyte tank <NUM> is detachably arranged on the inner frame <NUM> through a first fixing structure <NUM>, and the water tank <NUM> is detachably arranged on the inner frame <NUM> through a second fixing structure <NUM>, to facilitate maintenance of the oxygen removal module <NUM> and the fresh-keeping device <NUM>.

As shown in <FIG> and <FIG>, in some embodiments, the first fixing structure <NUM> includes a first connecting column <NUM>, a first stepped hole <NUM> and a first fixed connecting member (not shown in the drawings).

As shown in the drawings, the first connecting column <NUM> is arranged on the side wall of the inner frame <NUM>, the first connecting column <NUM> may be integrally formed with the inner frame <NUM> or separately arranged from the inner frame <NUM>. When the first connecting column is separately arranged from the inner frame <NUM>, the first connecting column <NUM> is fixed on the inner frame <NUM> through a fixing structure, such as a screw and a thread, and a first connecting hole <NUM> is formed in the first connecting column <NUM>. The first stepped hole <NUM> is arranged at a corresponding position of the electrolyte tank <NUM>, the first stepped hole <NUM> includes a first large hole <NUM> and a first small hole <NUM> with different diameters, the first large hole <NUM> is communicated with the first small hole <NUM>. The first connecting column <NUM> is capable of being arranged in the first large hole <NUM>. The first fixed connecting member passes through the first small hole <NUM> and is threadedly connected to the first connecting hole <NUM>.

It is foreseeable that, the first fixed connecting member may be a screw, a bolt, and other connecting members.

As shown in the drawings, in some embodiments, the second fixing structure <NUM> includes a second connecting column <NUM>, a second stepped hole <NUM> and a second fixed connecting member (not shown in the drawings).

The second connecting column <NUM> is arranged on the upper side wall of the inner frame <NUM>, the second connecting column may be integrally formed with the inner frame <NUM> or separately arranged from the inner frame <NUM>. When the second connecting column is separately arranged from the inner frame <NUM>, the second connecting column <NUM> is fixed on the inner frame <NUM> through a fixing structure, such as a screw and a thread, and a second connecting hole <NUM> is formed in the second connecting column <NUM>. The second stepped hole <NUM> is arranged at a corresponding position of the water tank <NUM>, the second stepped hole <NUM> includes a second large hole and a second small hole with different diameters (not shown in the drawings), the second large hole is communicated with the second small hole. The second connecting column <NUM> is capable of being arranged in the second large hole. The second fixed connecting member passes through the second small hole and is threadedly connected to the second connecting hole <NUM>.

It is foreseeable that, the second fixed connecting member may be a screw, a bolt, and other connecting members.

It is foreseeable that, an end portion of the first stepped hole <NUM> is provided with a first guide surface <NUM>, and an end portion of the second stepped hole <NUM> is provided with a second guide surface (not shown in the drawings), to facilitate insertion of the first connecting column <NUM> and the second connecting column <NUM> into the corresponding first stepped hole <NUM> and second stepped hole <NUM>.

The electrolyte tank <NUM> is detachably arranged on the inner frame <NUM> through the first fixing structure above, and the water tank <NUM> is detachably arranged on the inner frame <NUM> through the second fixing structure above, to improve connection reliability between the electrolyte tank <NUM> and the inner frame <NUM> and between the water tank <NUM> and the inner frame <NUM>, and realize simple, efficient and convenient assembly, thus reducing an assembly difficulty, and improving a system efficiency.

It can be understood that, the fixing structure may also be a structure of a screw or a bolt matched with a threaded hole directly, which will not be described in detail herein.

As shown in <FIG>, in some embodiments, the sealing strip <NUM> is arranged between the opening <NUM> and the drawer <NUM>, to ensure a sealing performance between the opening <NUM> and the drawer <NUM>. The sealing strip <NUM> may be arranged on the inner frame <NUM>, and a contour shape of an inner side of an end cover of the drawer <NUM> is adapted to a shape of the sealing strip <NUM>. The sealing strip <NUM> may be selected from one of the following strip: modified polyvinyl chloride (PVC), vulcanized ethylene propylene diene monomer (EPDM) and thermoplastic ehylene propylene diene monomer (EPDM/PP) rubber strips. The sealing strip <NUM> may also be arranged on the inner side of the end cover <NUM> of the drawer <NUM>, which facilitates sealing between the opening <NUM> of the frame and the drawer <NUM>.

As shown in <FIG>, in some embodiments, vent holes <NUM> are provided. The vent holes <NUM> are arranged in the side wall of the frame in an array. Vent holes <NUM> can increase an oxygen transfer area between the accommodating space <NUM> and the oxygen removal module <NUM>, thus improving an oxygen removal efficiency of the oxygen removal module <NUM>.

It can be understood that, in order to realize a fresh-keeping function of the fresh-keeping device <NUM>, it is necessary to supply electric energy to the oxygen removal module <NUM> of the fresh-keeping device <NUM>. Therefore, the oxygen removal module <NUM> further includes an electric control board <NUM>, the electric control board <NUM> may be mounted on the inner frame <NUM>, and the electric control board <NUM> is electrically connected to the oxygen removal module <NUM>. By setting a parameter of an oxygen content in the fresh-keeping device <NUM>, the electric control board <NUM> may control switching on and off of the oxygen removal module <NUM>, to control the oxygen content in the fresh-keeping device <NUM> in a set range. In addition, in order to automatically supplement water from the water tank <NUM> to the electrolyte tank <NUM>, an electric control valve may be arranged on the first pipeline <NUM>, and the electric control valve is electrically connected to the electric control board <NUM>. When the liquid level in the electrolyte tank <NUM> reaches a predetermined position, the electric control board <NUM> controls the electric control valve to open, to supplement water to the electrolyte tank <NUM>. When the liquid level in the electrolyte tank <NUM> is supplemented to the predetermined position, the electric control board <NUM> controls the electric control valve to close, to maintain the liquid level in the electrolyte tank <NUM> in a normal range.

Claim 1:
A refrigerator (<NUM>), comprising a fresh-keeping device (<NUM>),
the fresh-keeping device (<NUM>) comprises a frame (<NUM>) provided with an accommodating space (<NUM>), wherein one side of the frame (<NUM>) is provided with an opening (<NUM>), a wall of the frame (<NUM>) is provided with a vent hole (<NUM>), and the vent hole (<NUM>) is communicated with the accommodating space (<NUM>);
a drawer (<NUM>) capable of accessing and containing in the accommodating space (<NUM>) through the opening (<NUM>), to form a closed storage space with the frame (<NUM>); and
an oxygen removal module (<NUM>), wherein the oxygen removal module (<NUM>) for the refrigerator (<NUM>) comprises:
an electrolyte tank (<NUM>) provided with a water inlet (<NUM>); and
a water tank (<NUM>) provided with a water outlet (<NUM>), and the water outlet (<NUM>) is connected to the water inlet (<NUM>), and water is supplemented to the electrolyte tank (<NUM>) through the water tank (<NUM>);
wherein the electrolyte tank (<NUM>) is arranged at the vent hole (<NUM>), to consume oxygen inside the storage space through the oxygen removal module (<NUM>);
characterised in that the electrolyte tank (<NUM>) is provided with an oxygen exhaust hole (<NUM>), and the exhaust hole (<NUM>) is provided with an anti-toppling leakage structure (<NUM>);
wherein the anti-toppling leakage structure (<NUM>) comprises:
an exhaust passage (<NUM>) arranged in the electrolyte tank (<NUM>) along a vertical direction, wherein one end of the exhaust passage (<NUM>) is connected to the exhaust hole (<NUM>), and the other end of the exhaust passage (<NUM>) is communicated with the electrolyte tank (<NUM>);
a floating ball (<NUM>) arranged in the exhaust passage (<NUM>), wherein a gap is formed between the floating ball (<NUM>) and the exhaust passage (<NUM>), a diameter of the floating ball (<NUM>) is larger than an inner diameter of the exhaust hole (<NUM>), and the floating ball (<NUM>) is capable of blocking the exhaust hole (<NUM>); and
a stopping portion (<NUM>) arranged at the end of the exhaust passage (<NUM>) communicated with the electrolyte tank (<NUM>), to prevent the floating ball (<NUM>) from falling from the exhaust passage (<NUM>); and
wherein an inner wall of the exhaust passage (<NUM>) is provided with a plurality of exhaust grooves (<NUM>) along an axial direction.