CN114534439A

CN114534439A - Circulation oxygen exhaust device and kitchen appliance

Info

Publication number: CN114534439A
Application number: CN202011329624.XA
Authority: CN
Inventors: 业明坤; 赵建湘; 郑防震; 杨伸其; 陈龙; 赵红艳
Original assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2022-05-27
Also published as: WO2022111299A1

Abstract

The application discloses circulation oxygen discharging device and kitchen appliance, this circulation oxygen discharging device include air pump and adsorption tower: the air inlet of the air pump is communicated with the fresh-keeping chamber; the adsorption tower comprises an air inlet, an air outlet and an oxygen outlet, the air inlet of the adsorption tower is communicated with the air outlet of the air pump, and the air outlet of the adsorption tower is communicated with the fresh-keeping chamber; wherein the air pump is operated continuously in the cycle time to continuously discharge oxygen to the fresh-keeping chamber. The oxygen discharge efficiency of the refrigerator inner circulation oxygen discharge device can be improved.

Description

Circulation oxygen exhaust device and kitchen appliance

Technical Field

The application relates to the technical field of household appliances, in particular to a circulating oxygen discharging device and a kitchen appliance.

Background

In the fruit and vegetable fresh-keeping in long-distance transportation and storage, oxygen reduction, nitrogen filling and fresh keeping are widely applied at home and abroad all the time. However, in the field of home appliances, it has not been particularly effectively used due to technical limitations such as low efficiency of oxygen discharge.

Disclosure of Invention

The application provides a circulation oxygen discharging device and kitchen appliance to solve the technical problem that the oxygen discharging efficiency is low in the refrigerator in the prior art.

In order to solve the technical problem, a technical scheme that this application adopted provides a circulation oxygen exhaust device, and this circulation oxygen exhaust device is used for carrying out the oxygen extraction to the fresh-keeping room, and this circulation oxygen exhaust device includes air pump and adsorption tower:

the air inlet of the air pump is communicated with the fresh-keeping chamber;

the adsorption tower comprises an air inlet, an air outlet and an oxygen outlet, the air inlet of the adsorption tower is communicated with the air outlet of the air pump, and the air outlet of the adsorption tower is communicated with the fresh-keeping chamber;

wherein the air pump is operated continuously in the cycle time to continuously discharge oxygen to the fresh-keeping chamber.

Wherein, circulation oxygen discharging device is used for returning the residual gas after the oxygen discharge to the fresh-keeping room, and is used for carrying out circulation oxygen discharge to the residual gas in the fresh-keeping room to reduce the fresh-keeping room oxygen content.

The circulating oxygen discharge device is used for discharging oxygen from the air in the fresh-keeping chamber and returning the residual air after oxygen discharge to the fresh-keeping chamber; and then extracting the mixture of the residual air and the air from the fresh-keeping chamber to discharge oxygen to the mixture, returning the residual air after oxygen discharge to the fresh-keeping chamber to be discharged by the circulating oxygen discharge device again, and repeating in such a circulating way to realize continuous oxygen discharge of the fresh-keeping chamber by the circulating oxygen discharge device within the circulating time.

Wherein, the air inlet flow of the air inlet of the air pump is 3L/min-10L/min, and the air outlet flow of the oxygen outlet is 0.1L/min-0.5L/min.

Wherein the pressure of the air pump is 30KPa-100 KPa.

Wherein, circulation oxygen discharging device includes two at least buffer tanks, and two at least buffer tanks communicate in proper order, and the air inlet of the first buffer tank in two at least buffer tanks communicates in the gas outlet of adsorption tower, and the gas outlet of the last buffer tank communicates in the fresh-keeping room.

The circulating oxygen exhausting device comprises a valve component, an air outlet of the air pump is communicated with an air inlet of the adsorption tower through an air inlet channel of the valve component, and an air outlet of the adsorption tower is communicated with the fresh-keeping chamber through an air outlet channel of the valve component.

Wherein, the circulation oxygen discharging device comprises an oxygen storage tank, and an oxygen discharging port of the adsorption tower is communicated with the oxygen storage tank.

Wherein, adsorption tower, buffer tank and oxygen storage tank are cylindrical, have the same height, and set up in same level side by side.

Wherein the diameters of the adsorption tower, the buffer tank and the oxygen storage tank are all 20mm-40mm, and the heights are all 100mm-160 mm;

zeolite molecular sieve particles are arranged in the adsorption tower, and the size of the zeolite molecular sieve particles is 0.4-0.8 mm.

Wherein, adsorption tower, buffer tank and oxygen storage tank comprise the jar tower and the bottom plate of integral type, and jar tower is located jar tower with sealed a plurality of cavitys including a plurality of cavitys, the bottom plate lid that constitute adsorption tower, buffer tank and oxygen storage tank to make a plurality of cavitys form adsorption tower, buffer tank and the oxygen storage tank of mutual isolation respectively.

Wherein, the air inlet and the air outlet of the adsorption tower are arranged at the top end of the adsorption tower, and the oxygen outlet is arranged at the bottom end of the adsorption tower; the air inlet and the air outlet of the buffer tank are both arranged at the top end of the buffer tank; the air inlet of the oxygen storage tank is arranged at the bottom end of the oxygen storage tank;

the circulating oxygen discharging device comprises a gas circuit board which is arranged at the top ends of the adsorption tower, the buffer tank and the oxygen storage tank; a first air path, a second air path and a third air path are formed on the air path plate, the first air path is communicated with an air outlet of the adsorption tower and an air outlet channel of the valve assembly, and the second air path is communicated with the air outlet channel of the valve assembly and the first buffer tank; the third air path is communicated with the air inlet channel of the valve component and the air inlet of the adsorption tower.

The circulating oxygen discharging device also comprises a control device, the control device is connected with the valve component, the control device controls the opening of an air inlet channel of the valve component, so that the air pump pressurizes and transmits the air in the fresh-keeping chamber to the adsorption tower, the adsorption tower filters oxygen in the air, the oxygen is discharged from an air outlet of the adsorption tower, and residual air is adsorbed; the control equipment controls the air inlet channel of the valve component to be closed, so that the air pump stops pressurizing and transmitting air to the adsorption tower, and the adsorption tower releases residual air and discharges the residual air to the fresh-keeping chamber through the air inlet of the adsorption tower and the air outlet channel of the valve component.

The control equipment comprises an oxygen detector for detecting the oxygen content of the fresh-keeping chamber, and the control equipment controls the operation of the air pump and the valve assembly based on the oxygen content of the fresh-keeping chamber; and/or the presence of a gas in the gas,

the control equipment comprises an opening and closing detector for detecting the opening and closing condition of the fresh-keeping chamber, and the control equipment controls the operation of the air pump and the valve component based on the opening and closing condition of the fresh-keeping chamber.

The adsorption tower comprises two adsorption towers, wherein the two adsorption towers are divided into a first adsorption tower and a second adsorption tower; the valve assembly is provided with a first air inlet channel and a first air outlet channel corresponding to each first adsorption tower, and is provided with a second air inlet channel and a second air outlet channel corresponding to each second adsorption tower; and alternately controlling the opening of the first air inlet channel and the closing of the second air inlet channel in the valve assembly or the closing of the first air outlet channel and the opening of the second air outlet channel.

In order to solve the technical problems, one technical scheme adopted by the application is to provide a kitchen appliance, wherein the kitchen appliance comprises the circulating oxygen exhaust device, and the circulating oxygen exhaust device is communicated with a fresh-keeping chamber in the kitchen appliance;

the fresh-keeping room is provided with the check valve, and the outside air of fresh-keeping room can get into inside through the check valve.

The circulating oxygen discharging device comprises an air pump and an adsorption tower; the circulating oxygen discharge device continuously operates within the cycle time, continuously discharges oxygen to the gas in the fresh-keeping chamber to gradually reduce the oxygen content of the gas in the fresh-keeping chamber, so that the adsorption tower does not need to discharge a large amount of oxygen from the pressurized gas at one time, the adsorption tower can discharge a small amount of oxygen in the pressurized gas every time, the oxygen content of the gas in the fresh-keeping chamber can be reduced to a lower level through multiple times of circulating oxygen discharge, and the air pump can not pressurize the air in the fresh-keeping chamber to a higher pressure value, so that a small air pump can be used in the air pump to reduce the noise caused by oxygen control fresh keeping; and carry out the circulation oxygen suppliment to the gas in the fresh-keeping chamber that is provided with the check valve through circulation oxygen suppliment device, the air pump can only extract the gas in less fresh-keeping chamber relatively per unit interval, thereby only need supply a small amount of outside air to the fresh-keeping chamber in through the check valve, thereby only have a small amount of oxygen supply and advance in the fresh-keeping chamber, can not cause great influence to reducing the gaseous oxygen content in the fresh-keeping chamber, like this both can guarantee fresh-keeping chamber pressure balance, can reduce to lower level through the gaseous oxygen content in circulation oxygen suppliment with the fresh-keeping chamber again high-efficiently.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic structural diagram of a kitchen appliance according to an embodiment of the present application;

FIG. 2 is an exploded view of a cyclic oxygen elimination device according to an embodiment of the present application;

FIG. 3 is a schematic view illustrating the installation of an air pump in the oxygen circulation system according to an embodiment of the present application;

FIG. 4 is a schematic view of the gas flow in the cyclic oxygen elimination device according to an embodiment of the present application;

FIG. 5 is a schematic view of a gas path in the oxygen circulation system according to an embodiment of the present application;

FIG. 6 is a schematic view of a circuit board in the oxygen circulation device according to an embodiment of the present application;

fig. 7 is a schematic structural view of a circulation oxygen discharging device according to another embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is 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 at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

Referring to fig. 1, a kitchen appliance 1 includes a fresh food compartment 10 and a circulating oxygen discharge device 20. The circulating oxygen exhaust device 20 exhausts oxygen to the gas in the fresh-keeping chamber 10 and returns the gas to the fresh-keeping chamber 10 again, and the circulating oxygen exhaust device 20 exhausts oxygen to the gas in the fresh-keeping chamber 10 so as to reduce the oxygen content of the gas in the fresh-keeping chamber 10 and realize oxygen control fresh keeping. 70% -93% of oxygen in the fresh-keeping chamber 10 can be removed through the circulating oxygen removal device 20.

The kitchen appliance 1 of the present application may be a refrigerator, an oven, a juicer, or other household appliance that needs to be kept fresh by reducing the oxygen content.

For example, the oven includes toasting the chamber and circulation oxygen discharging device 20, wherein, can regard the chamber of toasting of oven as fresh-keeping chamber 10, circulation oxygen discharging device 20 communicates in toasting the chamber to through circulation oxygen discharging device 20 with toasting the gaseous oxygen content control of intracavity at lower level, keep fresh to the fruit vegetables when toasting the fruit vegetables, prevent that fruit vegetables oxidation from discolouring.

For another example, the juicer includes a juicing cavity and a circulating oxygen exhaust device 20, wherein the juicing cavity of the juicer can be used as the fresh-keeping chamber 10, and the circulating oxygen exhaust device 20 is communicated with the juicing cavity to control the oxygen content of the gas in the juicing cavity at a low level through the circulating oxygen exhaust device 20, so that the fruits and vegetables can be kept fresh when being juiced, and the color change of the juice caused by the oxidation of the fruits and vegetables can be prevented. Preferably, the circulation oxygen exhaust device 20 can be communicated with the opening at the top end of the juice extracting cavity. In addition, the circulating oxygen-discharging device 20 can discharge oxygen from the gas in the juice-squeezing cavity of the juicer after the juicer is charged and before juicing.

The fresh food compartment 10 may be an unsealed space. The fresh-keeping chamber 10 can be communicated with the outside air through a one-way valve, wherein when the air pressure of the fresh-keeping chamber 10 is lower than the outside air pressure of the fresh-keeping chamber 10 due to the fact that the circulating oxygen exhaust device 20 extracts air from the fresh-keeping chamber 10, the air outside the fresh-keeping chamber 10 can enter the fresh-keeping chamber 10 through the one-way valve, so that the fresh-keeping chamber 10 is kept at normal pressure, a large pressure difference cannot exist between the inside and the outside of the fresh-keeping chamber 10, the fresh-keeping chamber 10 is opened more easily, the outer wall of the fresh-keeping chamber 10 does not need to bear large pressure, the outer wall of the fresh-keeping chamber 10 does not need to be made of materials with high strength or a complex and special structure, and the manufacturing cost of the fresh-keeping chamber 10 is reduced; and the nitrogen-rich gas in the fresh-keeping chamber 10 can not flow out of the fresh-keeping chamber 10 through the one-way valve, so that the external excessive oxygen can be prevented from entering the fresh-keeping chamber 10, and the oxygen discharge efficiency can be ensured. Wherein, the check valve works automatically, and the valve clack in the check valve is opened under the pressure of the gas flowing from the outside to the fresh-keeping chamber 10; when the gas flows in the reverse direction, that is, when the gas flows from the fresh food compartment 10 to the outside of the fresh food compartment 10, the valve flap is closed by the pressure of the gas flowing from the fresh food compartment 10 to the outside and the self-weight of the valve flap and acts on the valve seat, thereby cutting off the flow.

Certainly, in other embodiments, the fresh-keeping chamber 10 may be a closed space, so that the air in the fresh-keeping chamber 10 is not communicated with the atmosphere, and further, the oxygen content of the fresh-keeping chamber 10 can be reduced by removing at least part of oxygen in the air in the fresh-keeping chamber 10 and returning the air after the oxygen removal to the fresh-keeping chamber 10 again, and oxygen control fresh keeping can be realized; the total content of the air in the fresh-keeping chamber 10 can be reduced, the air in the fresh-keeping chamber 10 is in a negative pressure state, the negative pressure fresh keeping is realized, the double fresh keeping effects of oxygen control fresh keeping and negative pressure fresh keeping can be realized, and the better fresh keeping effect is realized.

One or more fresh food compartments 10 may be provided. The fresh food compartment 10 may be a fresh food compartment 10 for storing food materials such as vegetables and fruits. By controlling the oxygen content of the preservation chamber 10 at a lower level, the respiration rate of the food materials stored in the preservation chamber can be reduced, the metabolism of the food materials is inhibited, the preservation effect is achieved, and the deterioration and the propagation of bacteria can be inhibited.

As shown in fig. 1, optionally, the fresh food compartment 10 is disposed in the kitchen appliance 1 in a drawer manner, and the oxygen circulation and discharge device 20 is disposed behind the fresh food compartment 10, that is, the oxygen circulation and discharge device 20 is disposed on a side of the fresh food compartment 10 away from the door of the kitchen appliance 1, so that when the fresh food compartment 10 is pulled open, the position of the oxygen circulation and discharge device 20 is not affected, and the connection relationship between the internal components of the oxygen circulation and discharge device 20 is not affected. In other embodiments, the fresh food compartment 10 may be formed by a cavity in the main body, and the refrigerator may further include a door for opening and closing the fresh food compartment 10.

In this embodiment, the kitchen appliance 1 further comprises an oxygen-enriched space. The circulating oxygen discharging device 20 is communicated to the oxygen-enriched space, and the oxygen-enriched space can receive the oxygen-enriched gas discharged from the fresh-keeping chamber 10, so that the oxygen content in the oxygen-enriched space is increased. The oxygen-enriched space can store meat food materials, and the freshness-keeping color of the meat stored in the oxygen-enriched space can be guaranteed to be more bright by increasing the oxygen content in the oxygen-enriched space.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of the cyclic oxygen exhausting apparatus 20 of the present application. As shown in fig. 2, the circulation oxygen discharging device 20 includes an adsorption tower 21. The adsorption tower 21 includes an air inlet, an air outlet, and an oxygen outlet. The air inlet of the adsorption tower 21 is communicated with the fresh-keeping chamber 10, the air outlet of the adsorption tower 21 is communicated with the fresh-keeping chamber 10, air in the fresh-keeping chamber 10 enters the adsorption tower 21 through the air inlet of the adsorption tower 21, the adsorption tower 21 carries out oxygen discharge on the air entering the fresh-keeping chamber 10, the air after oxygen discharge returns to the fresh-keeping chamber 10 through the air outlet of the adsorption tower 21, and filtered oxygen is discharged through an oxygen discharge port.

Optionally, the oxygen circulation and discharge device 20 may further include an air pump 22. The air pump 22 comprises an air inlet and an air outlet, and the air inlet of the air pump 22 is communicated with the fresh keeping chamber 10. The gas outlet of air pump 22 communicates in the air inlet of adsorption tower 21, and air pump 22 transmits the air pressurization of fresh-keeping chamber 10 to adsorption tower 21, and adsorption tower 21 carries out the oxygen discharging and returns to fresh-keeping chamber 10 again to the air that air pump 22 pressurizeed, carries out the oxygen discharging through air pump 22 and adsorption tower 21 to the air in the fresh-keeping chamber 10 to reduce the oxygen content of gas in the fresh-keeping chamber 10, thereby realize that the accuse oxygen is fresh-keeping.

Optionally, as shown in fig. 3, the oxygen circulation discharge device 20 may further include an air pump housing 23, and the air pump 22 is completely sealed in the air pump housing 23 to shield noise generated by the operation of the air pump 22 by the air pump housing 23, so as to reduce the noise. In addition, the air pump 22 can be fixed in the air pump housing 23 through the rubber pad 24, so that the vibration of the air pump 22 during operation can be reduced through the rubber pad 24, the effect of reducing vibration sound can be achieved, and the noise can be effectively reduced. Further, the air pump 22 may be vertically fixed inside the air pump housing 23, and the upper end and the lower end of the air pump 22 are respectively fixed by a rubber pad 24. The hardness of the rubber pad 24 may be 27 to 39 °, for example, 30 ° or 35 °.

It can be understood that, this application can circulate the oxygen extraction through the gas of circulation oxygen extraction device 20 in to the freshfood compartment 10, in order to operate continuously in cycle time, make in cycle time to the gas in the freshfood compartment 10 continuously the oxygen extraction, in order to reduce the gaseous oxygen content in freshfood compartment 10 step by step, thereby adsorption tower 21 need not once only to get rid of a large amount of oxygen from the gas of pressurizeing, adsorption tower 21 can discharge less amount of oxygen in the gas of pressurizeing at every turn, the oxygen content of the gas in freshfood compartment 10 can be reduced to lower level through many times of the oxygen extraction of circulation, make air pump 22 also can not pressurize the air of freshfood compartment 10 to higher pressure value, and then this application can use small-size air pump 22, in order to reduce the noise that the fresh-keeping brought of accuse oxygen.

For example, assuming that the air inlet flow of the air pump air inlet is 3L/min and the air outlet flow of the oxygen outlet is 0.1L/min, 3L of original gas can be pumped out of the fresh-keeping chamber in the first minute after the circular oxygen discharging device is started, then 0.1L of high-oxygen gas is discharged from the oxygen outlet, and 2.9L of residual gas is discharged to the fresh-keeping chamber from the air outlet of the adsorption tower, and the 2.9L of residual gas can be mixed with other gas in the fresh-keeping chamber to be discharged again by the circular oxygen discharging device; the second minute after the circulating oxygen discharging device is started can pump out 3L of gas consisting of residual gas and the original gas of the fresh-keeping chamber from the fresh-keeping chamber, and also can discharge 0.1L of high-oxygen gas from the oxygen discharging port, and return 2.9L of residual gas to the fresh-keeping chamber from the gas outlet of the adsorption tower so as to be discharged by the circulating oxygen discharging device again, so that the circulation is repeated, the oxygen content of the gas in the fresh-keeping chamber is gradually reduced, and the oxygen content of the gas in the fresh-keeping chamber is reduced to a lower level.

It can be understood that, in the cyclic oxygen discharging process, the cyclic oxygen discharging device 20 is used for returning the gas discharged with oxygen by the cyclic oxygen discharging device 20 to the fresh food compartment 10, and is used for discharging oxygen again to the gas discharged with oxygen in the fresh food compartment 10. Specifically, the air pump 22 may be used to pressurize and supply the air and/or the oxygen-depleted gas pumped from the fresh food compartment 10 to the adsorption tower 21, and the adsorption tower 21 is used to discharge the air and/or the oxygen-depleted gas pressurized by the air pump 22 and supply the oxygen-depleted gas to the fresh food compartment 10 again.

In addition, the air in the preservation chamber 10 provided with the one-way valve is circularly exhausted through the circular oxygen exhausting device 20, the air pump 22 can only pump relatively less air in the preservation chamber 10 per unit time, so that only a small amount of outside air needs to be supplemented into the preservation chamber 10 through the one-way valve, and only a small amount of oxygen is supplemented into the preservation chamber 10, so that the reduction of the oxygen content of the air in the preservation chamber 10 cannot be greatly influenced, the pressure balance of the preservation chamber 10 can be ensured, and the oxygen content of the air in the preservation chamber 10 can be efficiently reduced to a lower level through the circular oxygen exhausting.

Optionally, the present application may perform oxygen discharge on the air in the fresh keeping chamber 10 by adsorbing nitrogen and removing oxygen through the adsorption tower 21, wherein when adsorbing by the adsorption tower 21, nitrogen is adsorbed, oxygen in the air in the fresh keeping chamber 10 pressurized by the air pump 22 is filtered, and the filtered oxygen is discharged through an oxygen discharge port of the adsorption tower 21; when the adsorption tower 21 is desorbed, the residual gas for removing oxygen is released, and the residual gas is returned to the fresh-keeping chamber 10 through the gas outlet of the adsorption tower 21, that is, the pressure swing adsorption oxygen generation technology is reversely applied to the circulating oxygen discharge device 20, compared with an oxygen generator, oxygen is not used, high-purity oxygen does not need to be extracted in the application, so that the gas in the fresh-keeping chamber 10 does not need to be pressurized to a higher pressure by the gas pump 22 of the circulating oxygen discharge device 20 for obtaining the gas with extremely high oxygen content, and oxygen does not need to be extracted at one time, the fresh-keeping chamber 10 can be discharged by adopting a continuous circulating oxygen discharge mode, the gas in the fresh-keeping chamber 10 can be pressurized to a lower pressure by the gas pump 22, for example, the pressure is increased to 0.03 MPa-0.10 MPa, so that the oxygen content of the gas in the fresh-keeping chamber 10 can be reduced to a lower level by the small-sized gas pump 22, and the miniaturization of the circulating oxygen discharge device 20 is realized, low-pressure separation is realized, so that the noise caused by oxygen control and fresh keeping is fundamentally reduced, the power consumption of the air pump 22 is reduced, and the service life of the air pump 22 is not influenced by excessive heat generated by the air pump 22. In addition, the gas in the fresh-keeping chamber 10 is circularly exhausted in a mode of absorbing nitrogen and eliminating oxygen through the absorption tower 21, so that the oxygen content of the gas in the fresh-keeping chamber 10 can be effectively reduced. In addition, compared with an oxygen-enriched film oxygen discharge mode which can only discharge 28% of oxygen at most, 70% -93% of oxygen in the fresh-keeping chamber 10 can be discharged in a mode of adsorbing nitrogen through the adsorption tower 21 and discharging oxygen, the oxygen discharge efficiency is high, a large amount of air outside the fresh-keeping chamber 10 does not need to be supplemented, and the oxygen discharge efficiency is guaranteed.

In other implementations, the present application may perform oxygen evacuation of the air in the fresh food compartment 10 by adsorbing oxygen through the adsorption tower 21 and removing oxygen. Wherein, when the adsorption tower 21 adsorbs oxygen, the residual gas after oxygen elimination is filtered out, and the residual gas after oxygen elimination is returned to the fresh-keeping chamber 10 from the gas outlet of the adsorption tower 21; when the adsorption tower 21 desorbs, the adsorbed oxygen is released and is discharged through an oxygen discharge port of the adsorption tower 21. Of course, the present application can also place the electrolytic film in the adsorption tower 21 to consume the oxygen in the air in the fresh food compartment 10 through the electrolytic film, and return the residual gas after the oxygen is discharged to the fresh food compartment 10 through the air outlet of the adsorption tower 21.

For convenience of description, the following will describe the circulation oxygen discharging apparatus 20 using the adsorption tower 21 for adsorbing nitrogen gas to discharge oxygen. It is understood that the following at least partial embodiments may be equally applied to the cyclic oxygen exhauster 20 using the adsorption tower 21 for adsorbing oxygen to realize oxygen exhaustion, the cyclic oxygen exhauster 20 using the adsorption tower 21 for realizing oxygen exhaustion, and the like, after performing equivalent structural changes.

In order to facilitate the control of the adsorption and desorption processes of the adsorption tower 21, the adsorption tower 21 can be switched between the adsorption and desorption states through the valve assembly 25, the air inlet of the adsorption tower 21 can be communicated with the air outlet of the air pump 22 through the air inlet channel of the valve assembly 25, the air outlet of the adsorption tower 21 can be communicated with the fresh food compartment 10 through the air outlet channel of the valve assembly 25, when the air inlet channel of the valve assembly 25 is opened and the air outlet channel of the valve assembly 25 is closed, the air pump 22 pressurizes the air in the fresh food compartment 10 and transmits the air to the adsorption tower 21 through the air inlet channel of the valve assembly 25, the adsorption tower 21 is in the adsorption state, the adsorption tower 21 adsorbs nitrogen in the air, filters out oxygen in the air, and discharges the oxygen from the oxygen outlet of the adsorption tower 21; when the air inlet channel of the valve assembly 25 is closed and the air outlet channel of the valve assembly 25 is opened, the air pump 22 stops pressurizing and conveying air to the adsorption tower 21, the adsorption tower 21 is in a desorption state, and the residual air released by the adsorption tower 21 is discharged to the fresh keeping chamber 10 through the air outlet of the adsorption tower 21 and the air outlet channel of the valve assembly 25. Alternatively, the valve assembly 25 of the present application may include a first valve 251 and a second valve 252, wherein the outlet passage is disposed in the first valve 251 and the inlet passage is disposed in the second valve 252. Of course, in other implementations, the outlet channel and the inlet channel may be disposed in the same valve assembly 25.

In order to reduce the oxygen content in the fresh keeping chamber 10 with high efficiency and low time consumption, at least two adsorption towers 21 can be arranged in the circulating oxygen exhaust device 20, the air in the fresh keeping chamber 10 can be continuously exhausted by the at least two adsorption towers 21, residual air adsorbed by the adsorption towers 21 can be continuously desorbed into the fresh keeping chamber 10, and the oxygen content in the fresh keeping chamber 10 can be controlled with high efficiency and low time consumption.

Wherein, the at least two adsorption towers 21 may include a first adsorption tower 21 and a second adsorption tower 21. When the switching of the adsorption and desorption states of one adsorption tower 21 is realized through the first valve 251 and the second valve 252, the first valve 251 has a first air inlet channel corresponding to each first adsorption tower 21, and has a second air inlet channel corresponding to each second adsorption tower 21; the second valve 252 has a first gas outlet channel corresponding to each first adsorption tower 21, and a second gas outlet channel corresponding to each second adsorption tower 21. The first air inlet channel and the second air inlet channel in the first valve 251 are opened alternately, the second air outlet channel and the first air outlet channel are opened alternately, the first air outlet channel is controlled to be closed and the second air outlet channel is controlled to be opened when the first air inlet channel is opened, the second air outlet channel is controlled to be closed and the first air outlet channel is controlled to be opened when the second air inlet channel is opened, and therefore when one of the first adsorption tower 21 and the second adsorption tower 21 adsorbs, residual air desorbed from the other of the first adsorption tower 21 and the second adsorption tower 21 flows into the fresh-keeping chamber 10 through the air outlet channel, and the oxygen content in the fresh-keeping chamber 10 is controlled efficiently and with low consumption.

Further, the number of the adsorption towers 21 is two. The first valve 251 and the second valve 252 are two-position three-way electromagnetic valves, and the opening and closing of the first outlet channel and the second outlet channel inside the first valve 251 and the opening and closing of the first inlet channel and the second inlet channel inside the second valve 252 can be freely switched by the two-position three-way electromagnetic valves, thereby realizing the switching of the working states of the two adsorption towers 21, and when one of the first adsorption tower 21 and the second adsorption tower 21 adsorbs, the residual air desorbed from the other of the first adsorption tower 21 and the second adsorption tower 21 flows into the fresh food compartment 10 through the air outlet passage, so that the operation of the first valve 251 and the second valve 252 and the air pump 22 can be controlled to continuously discharge the oxygen from the air in the fresh food compartment 10, and residual gas adsorbed by the adsorption tower 21 can be continuously desorbed and transmitted into the fresh-keeping chamber 10, so that the oxygen content in the fresh-keeping chamber 10 can be controlled efficiently and in a low-consumption time manner.

In the present embodiment, the adsorption tower 21 may be provided therein with an adsorbent. When the adsorbent in the adsorption tower 21 is in an adsorption state, the adsorption capacity of the adsorbent for nitrogen is higher than that for oxygen. The adsorbent material provided in the adsorption tower 21 may be zeolite molecular sieve particles. The polarity of nitrogen in the air is greater than that of oxygen, the zeolite molecular sieve has different adsorption capacities for oxygen and nitrogen in the air, nitrogen can be preferentially adsorbed from the air through the zeolite molecular sieve, and oxygen in the air can be filtered out, so that the air enters from the air inlet of the adsorption tower 21, and the oxygen content in the air flowing out of the adsorption tower 21 exceeds the oxygen content in the air through the adsorption of the zeolite molecular sieve. And then the oxygen content in the gas desorbed from the zeolite molecular sieve is obviously lower than the oxygen content in the air, namely the gas desorbed from the zeolite molecular sieve is low-oxygen-content gas, and the gas desorbed from the zeolite molecular sieve is transmitted into the fresh-keeping chamber 10, so that the oxygen content in the fresh-keeping chamber 10 can be reduced, and the fresh-keeping effect is improved. The zeolite molecular sieve particles may have a size of from 0.4mm to 0.8mm, for example 0.5mm, 0.6mm, 0.7 mm. Of course, in other embodiments, the adsorption material disposed in the adsorption tower 21 may also be a silicoaluminophosphate molecular sieve.

That is, the present embodiment controls the oxygen content of the fresh food compartment 10 by the adsorption and desorption of the adsorption tower 21, and since the adsorbent has a characteristic that the adsorption amount increases with the increase of the partial pressure of the adsorbed component, the present embodiment accomplishes the adsorption and desorption by the pressure change to realize the air separation, that is, the adsorption tower 21 is in the adsorption or desorption state by the pressure change. Specifically, in the embodiment, the pressure of the air is increased by the air pump 22, so that the air becomes compressed air, and then the compressed air is introduced into the adsorption tower 21, the pressure in the adsorption tower 21 is increased in a phase-change manner, thereby the adsorption tower 21 is in an adsorption stage, even if the adsorption tower 21 filters out at least part of oxygen in the compressed air, when the air pump 22 no longer transmits the compressed air to the adsorption tower 21, the pressure in the adsorption tower 21 is reduced, the adsorption capacity of the adsorption tower 21 on substances such as nitrogen and the like adsorbed by the adsorption tower is reduced, the adsorption tower 21 desorbs the substances adsorbed in the adsorption tower 21, and the substances flow into the fresh-keeping chamber 10 through the air inlet of the adsorption tower 21 and the air outlet channel of the second valve 252, that is, the residual air desorbed by the adsorption tower 21 flows into the second fresh-keeping chamber 10, so that the oxygen content in the fresh-keeping chamber 10 is reduced, and oxygen-controlled fresh keeping can be realized. Corresponding to the particle size of the zeolite molecular sieve, in this embodiment, the air pump 22 can pressurize the air to 0.03MPa to 0.2MPa, so as to ensure that the adsorption tower 21 can filter out at least part of the oxygen in the compressed air under the pressure. Further, when the oxygen content of the gas in the fresh-keeping chamber 10 is gradually reduced by adopting the circulating oxygen discharge, the air pump 22 can pressurize the air to 0.03MPa to 0.10MPa, such as 40KPa, 60KPa, 75KPa and the like, so that the oxygen content of the gas in the fresh-keeping chamber 10 is reduced to a lower level by circulating oxygen discharge for multiple times through the small air pump 22, low-pressure separation is realized, and the noise caused by oxygen control and fresh keeping is fundamentally reduced.

The particle size of the zeolite molecular sieve corresponds to the pressurization of the air by the air pump 22, so that the air pump 22 can be miniaturized, the power consumption of the circulating oxygen discharge device 20 is reduced, and the noise is reduced. If the particle size of the zeolite molecular sieve is too small, the gas flow transmission resistance becomes too large, and the pressure needs to be increased appropriately. Therefore, the particle size of the zeolite molecular sieve filled in the adsorption tower 21 should be uniform and moderate, for example, the size of the zeolite molecular sieve particles is set to 0.4 mm-0.8 mm, and the pressure in the adsorption tower 21 is 0.03 MPa-0.10 MPa, so that the oxygen in the air flow can be filtered out, thereby avoiding the need of the air pump 22 to increase excessive pressure to the air, realizing the miniaturization of the air pump 22, reducing the power consumption of the circulating oxygen discharge device 20, and reducing noise.

In this embodiment, the adsorption tower 21 can be cylindrical, and the cylindrical adsorption tower 21 is matched, so that the cylindrical volume is larger, more zeolite molecular sieves can be contained, and the airflow is smoother and more uniform under the condition that the occupied area is the same. Of course, the adsorption tower 21 may have other regular or irregular shapes such as a cube and a rectangular parallelepiped.

The adsorption capacity of the adsorption tower 21 can be controlled by controlling the size of the adsorption tower 21, the adsorption capacity of the adsorption tower 21 can be ensured and the smaller volume can be kept when the size of the adsorption tower 21 is controlled in a proper range, the adsorption tower 21 with the size can be matched with a zeolite molecular sieve to correspond to a small air pump 22, the air pump 22 and the adsorption tower 21 are integrated, and the optimization of the whole structure can be realized. Specifically, the diameter of the adsorption tower 21 may range from 20mm to 40 mm. The height range of the adsorption tower 21 can be 100mm-160mm, which avoids the problem that the air pump 22 needs higher working pressure due to the overlarge volume of the adsorption tower 21, and also avoids the problem that the oxygen discharge efficiency is low due to the fact that a small amount of gas needs to be desorbed to remove residual gas after the oxygen is filtered due to the overlong volume of the adsorption tower 21, so that the filtering efficiency of the adsorbed substances of the adsorption tower 21 on the oxygen in the gas when the gas with the transmission flow of 30KPa-100KPa is 3L/min-15L/min enters the adsorption tower 21 with the size can be ensured. Alternatively, the diameter of the adsorption tower 21 may be 20mm, 24mm, 29mm, 32mm, or 37 mm. The height of the adsorption column 21 may be 120mm, 135mm, 140mm, 150mm or 155 mm.

The delivery flow rate of the air pump 22 is designed correspondingly to the small size of the adsorption tower 21. The contact time of the molecules in the compressed air with the adsorbent in the adsorption tower 21 can be changed by changing the delivery flow rate of the air pump 22, thereby changing the adsorption efficiency of the adsorption tower 21 on the compressed air. The transmission speed is too high, so that the contact time of molecules in the compressed air and the adsorption substance is too short, the adsorption of gas is not facilitated, and the adsorption rate is reduced; too low a transfer speed increases the capacity of the adsorption tower 21. Therefore, the delivery flow rate is controlled within a certain range, and in the embodiment, the delivery flow rate of the air pump 22 is 3L/min to 15L/min, specifically 5L/min, 8L/min or 10L/min. Of course, in order to maintain the adsorption efficiency of the adsorption tower 21, the ratio of the delivery flow rate of the air pump 22 per second to the volume of the adsorption tower 21 may be 1.2 to 2.2.

In this embodiment, the air outlet flow of the oxygen outlet is 0.1L/min to 0.5L/min, so that the oxygen-enriched air is discharged from the oxygen outlet by the oxygen circulation and discharge device 20 at a small flow rate, and the total amount of air discharged from the oxygen outlet is reduced under the condition that the oxygen is discharged from the oxygen outlet by the oxygen circulation and discharge device 20 at a certain flow rate, so as to ensure that the oxygen content of the air discharged from the oxygen outlet is higher, avoid discharging a large amount of non-oxygen air through the oxygen outlet, and further ensure the oxygen discharge efficiency of the oxygen circulation and discharge device 20 to the fresh keeping chamber 10. In addition, the ratio of the outlet flow rate of the oxygen outlet to the inlet flow rate of the air inlet of the air pump 22 is 1/100-1/6.

In addition, corresponding to the low noise design of the circulation oxygen discharging device 20, the circulation oxygen discharging device 20 of the present application may further include a buffer tank 26, and the buffer tank 26 is used for buffering the residual gas discharged from the gas outlet of the adsorption tower 21, so as to reduce the flow rate of the residual gas and reduce the noise. Furthermore, the buffer tanks 26 of the present application may be at least two buffer tanks 26 that are sequentially communicated, the adsorption tower 21 is communicated with the first buffer tank 26 through the air outlet channel of the second valve 252, the residual air passes through the first buffer tank 26 and then comes out from the air outlet of the first buffer tank 26, the residual air realizes primary buffering, the residual air coming out from the first buffer tank 26 enters the air inlet of the second buffer tank 26, passes through the second buffer tank 26 and then comes out from the air outlet of the second buffer tank 26, secondary buffering is realized, and the residual air comes out from the air outlet of the last buffer tank 26, so as to realize at least secondary buffering, the residual air discharged from the air outlet of the adsorption tower 21 is buffered at least twice by the at least two buffer tanks 26, and the buffered residual air is supplied to the fresh-keeping chamber 10 by the last buffer tank 26, so that the flow rate of the residual air is greatly reduced, and the noise caused by the flow rate of the residual air being too fast is greatly reduced, and can avoid the impact of the gas with higher flow velocity on the objects in the fresh food compartment 10 to protect the objects in the fresh food compartment 10. For example, as shown in fig. 4, the circulation oxygen discharging device 20 includes a first buffer tank 261 and a second buffer tank 262, after the residual air discharged from the adsorption tower 21 is primarily buffered by the first buffer tank 261, the residual air enters the second buffer tank 262 to secondarily buffer the residual air by the second buffer tank 262, so as to reduce the flow rate of the residual air and reduce noise.

In this embodiment, the buffer tank 26 may be cylindrical. Of course, the buffer tank 26 may have other regular or irregular shapes such as a square, a rectangular parallelepiped, etc. The diameter of the buffer tank 26 may range from 20mm to 40 mm. The height of the buffer tank 26 may range from 100mm to 160 mm.

The diameters of the outlet and inlet ports of each buffer tank 26 are about 0.5 to 5mm to reduce the flow rate of the surplus air entering and exiting from each buffer tank 26 by restricting the diameters of the outlet and inlet ports of the buffer tanks 26, thereby effectively buffering the surplus air.

In addition, the oxygen circulation and discharge device 20 of the present application may further include an oxygen storage tank 27, an air inlet of the oxygen storage tank 27 is connected to the oxygen discharge port of the adsorption tower 21 through a valve, so that when the air inlet channel of the first valve 251 is opened, the oxygen filtered by the adsorption tower 21 flows into the oxygen storage tank 27 through the oxygen discharge port, and the flow rate of the oxygen entering the oxygen storage tank 27 from the adsorption tower 21 is controlled by the valve; when the air inlet channel of the first valve 251 is closed, the oxygen of the oxygen storage tank 27 flows into the adsorption tower 21 through the oxygen outlet, and the oxygen of the air storage tank backflushes the adsorbed substances in the adsorption tower 21, so that the adsorption tower 21 desorbs the residual air and returns the residual air to the fresh-keeping chamber 10 through the air outlet channel of the second valve 252, and the flow of the oxygen entering the adsorption tower 21 from the air storage tank is controlled through a valve to control the flow of the backflushing.

In the present embodiment, the oxygen tank 27 may be cylindrical. Of course, the oxygen storage tank 27 may be in other regular or irregular shapes such as a cube, a rectangular parallelepiped, etc. The diameter of the oxygen tank 27 may range from 20mm to 40 mm. The height of the oxygen tank 27 may range from 100mm to 160 mm.

Alternatively, the valve may be a throttle. The diameter of the throttle may be 0.3-0.6mm, for example 0.4mm, 0.45mm or 0.56 mm.

Alternatively, the adsorption tower 21, the buffer tank 26 and the oxygen storage tank 27 may be formed of an integrated tank tower and floor, and the adsorption function, the buffer function and the oxygen storage function are integrated into one integrated member to reduce the volume and weight of the cyclic oxygen exhauster 20 formed of the adsorption tower 21 and the like. The tank tower includes a plurality of cavities, bottom plate covers, which constitute the adsorption tower 21, the buffer tank 26 and the oxygen storage tank 27, and the tank tower is arranged to seal the plurality of cavities, and the plurality of cavities form the adsorption tower 21, the buffer tank 26 and the oxygen storage tank 27 which are isolated from each other, respectively.

In addition, the adsorption tower 21, the buffer tank 26 and the oxygen storage tank 27 may have the same height and be disposed side by side at the same level, which may ensure the compact structure of the oxygen circulation and discharge device 20, to realize the compact design of the oxygen circulation and discharge device 20, and to facilitate the distribution of the gas path. In other embodiments, the heights of the adsorption tower 21, the buffer tank 26, and the oxygen storage tank 27 may be different, may not be arranged side by side, or may not be arranged at the same level.

Alternatively, the adsorption tower 21, the buffer tank 26, and the oxygen tank 27 may have the same size. Of course, in other embodiments, the sizes of the adsorption tower 21, the buffer tank 26, and the oxygen storage tank 27 may be different.

The gas inlet and the gas outlet of the adsorption tower 21 are arranged at the top end of the adsorption tower 21, and the oxygen outlet is arranged at the bottom end of the adsorption tower 21; the air inlet and the air outlet of the buffer tank 26 are both arranged at the top end of the buffer tank 26; the air inlet of the oxygen storage tank 27 is arranged at the bottom end of the oxygen storage tank 27 so as to be convenient for arranging a pipeline and reduce the volume of the circulating oxygen discharging device 20 formed by the adsorption tower 21 and the like.

In the present embodiment, the adsorption tower 21, the buffer tank 26, and the oxygen storage tank 27 may constitute a concave structure into which the air pump housing 23 may be inserted to reduce the volume of the circulation oxygen discharging apparatus 20 constituted by the adsorption tower 21 and the like.

It is understood that, as shown in fig. 5, in order to realize the flow of the gas among the air pump 22, the fresh food compartment 10, the adsorption tower 21, and the like, an air path may be provided among the air pump 22, the fresh food compartment 10, and the adsorption tower 21. The air inlet of the air pump 22 is communicated with the fresh-keeping chamber 10 through a fourth air channel 284, the air outlet of the air pump 22 is communicated with the air inlet channel of the first valve 251 through a fifth air channel 285, the air inlet channel of the first valve 251 is communicated with the air inlet of the adsorption tower 21 through a third air channel 283, the air outlet of the adsorption tower 21 is communicated with the air outlet channel of the second valve 252 through a first air channel 281, the air outlet channel of the second valve 252 is communicated with the first buffer tank 26 through a second air channel 282, two adjacent buffer tanks 26 are communicated through a sixth air channel 286, the last buffer tank 26 is communicated with the fresh-keeping chamber 10 through a seventh air channel 287, the oxygen outlet of the adsorption tower 21 is communicated with the air inlet of the oxygen storage tank 27 through an eighth air channel 288, and the air outlet of the oxygen storage tank 27 is discharged through a ninth air channel 289. Generally, the first air path 281 to the ninth air path 289 may be designed as air tubes independent of each other, but the arrangement of the air tubes is troublesome due to a large number of air paths, and the volume of the cyclic oxygen discharging device 20 composed of the adsorption tower 21, the air pump 22, the air paths, etc. may also be large, so that at least a part of the air paths may be disposed in one air path plate 280, so as to design the main air path as one air path plate 280, without using a plurality of air tubes for connection, thereby achieving the tidiness of the air paths, and simplifying the manufacturing process of the cyclic oxygen discharging device 20 and reducing the number of fixing members for fixing a plurality of air tubes, thereby improving the assembling efficiency of the cyclic oxygen discharging device 20 and reducing the manufacturing cost of the cyclic oxygen discharging device 20. Wherein the trachea can be soft or hard.

For example, as shown in fig. 6, the present application may provide a third air passage 283, a first air passage 281, and a second air passage 282 in the air passage plate 280. For this purpose, the gas inlet and the gas outlet of the adsorption tower 21 and the gas inlet and the gas outlet of the buffer tank 26 may be disposed toward the gas path plate 280, so that the gas can flow between the adsorption tower 21 and the buffer tank 26 through the gas path plate 280 and the second valve 252, and the length of the sixth gas path 286 may be reduced. Wherein, the gas path plate 280 may be disposed at the top ends of the adsorption tower 21, the buffer tank 26 and the oxygen storage tank 27. Alternatively, the first valve 251 and the second valve 252 may be provided between the gas passage plate 280 and the gas pump 22 to improve the compactness of the circulation oxygen discharging device 20 constituted by the adsorption tower 21 and the like to reduce the volume of the circulation oxygen discharging device 20. In addition, the oxygen discharge port of the adsorption tower 21 and the air inlet of the oxygen storage tank 27 face away from the side of the air pump 22, so that the eighth air passage 288 does not need to be provided between the adsorption tower 21 and the air pump 22, and the adsorption tower 21, the air pump 22, the oxygen storage tank 27 and the buffer tank 26 are more compact.

In this embodiment, the circulation oxygen discharging device 20 may further include a control apparatus. The control device can be electrically connected with the air pump 22 and the valve assembly 25, can control the operation of the air pump 22, and can also control the opening and closing of an air inlet channel and an air outlet channel in the valve assembly 25.

Further, the control device may comprise an oxygen detector. An oxygen detector may be used to detect the oxygen content of the fresh food compartment 10 and a control device controls the operation of the air pump 22 and valve assembly 25 based on the oxygen content of the fresh food compartment 10. When the oxygen content of the fresh-keeping chamber 10 detected by the oxygen detector is higher than the first threshold value, the air pump 22 and the valve assembly 25 can be controlled, and the oxygen content in the fresh-keeping chamber 10 is controlled through the air pump 22, the valve assembly 25 and the adsorption tower 21 together, so that the oxygen content in the fresh-keeping chamber 10 is reduced. When the oxygen content detected by the oxygen sensor is lower than the second threshold, the air pump 22 can be controlled to stop operating, i.e. the oxygen content of the fresh food compartment 10 is no longer controlled by the air pump 22, the valve assembly 25 and the adsorption tower 21.

Further, the control device may further include an open/close detector for detecting whether the fresh food compartment 10 is open, and the control device may control the operation of the air pump 22 and the valve assembly 25 based on the open/close condition of the fresh food compartment 10. When the opening and closing detector detects that the fresh-keeping chamber 10 is not opened, the air pump 22 and the valve assembly 25 can be controlled, the oxygen content in the fresh-keeping chamber 10 is controlled through the combined action of the air pump 22, the valve assembly 25 and the adsorption tower 21, the oxygen content in the fresh-keeping chamber 10 is reduced, and when the opening and closing detector detects that the fresh-keeping chamber 10 is opened, the air pump 22 and the valve assembly 25 can be controlled to stop working. Optionally, the opening/closing detector may be any one of a light sensor, an infrared sensor, and a magnetic control switch, so as to detect opening/closing of the fresh keeping chamber 10.

In addition, the control device may be further configured to decrease the oxygen content of the fresh food compartment 10 by the air pump 22, the first valve 251, the second valve 252, and the adsorption tower 21 at a daily timing. For example, the air pump 22, the first valve 251, the second valve 252 and the adsorption tower 21 are controlled to reduce the oxygen content of the fresh food compartment 10 at 9 to 12 o 'clock and 14 to 16 o' clock every day, and the rest of the time is stopped. For another example, the system is turned on for 2 hours a day, stopped for 4 hours a day, and cycled on and off. The specific numerical values above are merely examples, and are not intended to limit the present application.

Fig. 7 is a schematic structural view of a circulation oxygen discharging device 20 according to another embodiment of the present application.

Referring to fig. 7, the oxygen circulation and discharge device 20 of the present embodiment includes two adsorption towers 21, an oxygen storage tank 27, two buffer tanks 26, an air pump 22 and a valve assembly 25. The valve assembly 25 is a two-position five-way valve.

The air inlet of the air pump 22 is communicated with the fresh-keeping chamber 10 through a fourth air passage 284, the air outlet of the air pump 22 is communicated with the air inlet passage of the valve assembly 25 through a fifth air passage 285, the air inlet passage of the valve assembly 25 is communicated with the air inlet of the adsorption tower 21 through a third air passage 283, the air outlet of the adsorption tower 21 is communicated with the air outlet passage of the valve assembly 25 through a first air passage 281, the air outlet passage of the valve assembly 25 is communicated with the first buffer tank 261 through a second air passage 282, two adjacent buffer tanks 26 are communicated through a sixth air passage 286, the last buffer tank 26 is communicated with the fresh-keeping chamber 10 through a seventh air passage 287, the oxygen outlet of the adsorption tower 21 is communicated with the air inlet of the oxygen storage tank 27 through an eighth air passage 288, and the air outlet of the oxygen storage tank 27 is discharged through a ninth air passage 289. The first air passage 281 to the ninth air passage 289 are respectively designed as air pipes independent of each other.

Wherein, adsorption tower 21, buffer tank 26 and oxygen storage tank 27 are all cylindrical, have the same height, and set up in same level side by side. The valve assembly 25 is disposed at the bottom end of the surge tank 26. The air pump 22 is disposed on a side of the valve assembly 25 facing away from the adsorption tower 21.

In addition, the air inlet and the air outlet of the adsorption tower 21 are arranged at the bottom end of the adsorption tower 21, and the oxygen outlet is arranged at the top end of the adsorption tower 21. The air inlet of the first buffer tank 261 is disposed at the bottom end of the first buffer tank 261. An air outlet of the first buffer tank 261 is disposed at a top end of the first buffer tank 261. The air inlet and the air outlet of the second buffer tank 262 are both arranged at the top end of the second buffer tank 262. The air inlet and the air outlet of the oxygen storage tank 27 are both arranged at the top end of the oxygen storage tank 27. And the air outlet of the air pump 22 is disposed toward the valve assembly 25.

In summary, the oxygen circulation and discharge device 20 of the present application includes an air pump 22 and an adsorption tower 21, the oxygen circulation and discharge device 20 continuously operates within a cycle time, continuously discharges oxygen to the gas in the fresh-keeping chamber 10, so as to gradually reduce the oxygen content of the gas in the fresh-keeping chamber 10, thereby the adsorption tower 21 does not need to discharge a large amount of oxygen from the pressurized gas once, the adsorption tower 21 can discharge a small amount of oxygen in the pressurized gas every time, the oxygen content of the gas in the fresh-keeping chamber 10 can be reduced to a low level through multiple oxygen discharge of the circulation, so that the air pump can not pressurize the air of the fresh-keeping chamber 10 to a high pressure value, and further, the present application can use a small air pump, so as to reduce the noise caused by oxygen control and fresh keeping.

In addition, the fresh-keeping chamber 10 can be provided with a one-way valve, so that the fresh-keeping chamber can be conveniently opened, and the outer wall of the fresh-keeping chamber 10 does not need to bear larger pressure through the one-way valve, so that the material for manufacturing the outer wall of the fresh-keeping chamber 10 does not need to have higher strength or adopt a complex special structure, and the application cost is reduced; and carry out the circulation oxygen suppliment to the gas in the preservation room 10 that is provided with the check valve through circulation oxygen suppliment device 20, the air pump can only extract the gas in the preservation room 10 less relatively per unit interval, thereby only need supply a small amount of outside air to preservation room 10 through the check valve in, thereby only have a small amount of oxygen supply enter in the preservation room 10, can not cause great influence to reducing the oxygen content of the interior gas of preservation room 10, so both can guarantee preservation room 10 pressure balance, can reduce the oxygen content of the interior gas of preservation room 10 to lower level through the circulation oxygen suppliment again high-efficiently.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

1. A circulating oxygen exhaust device is characterized in that the circulating oxygen exhaust device is used for exhausting oxygen in a fresh-keeping room, and comprises:

the air pump comprises a first air inlet and a first air outlet, and the first air inlet of the air pump is communicated with the fresh-keeping chamber;

the adsorption tower comprises a second air inlet, a second air outlet and an oxygen outlet, the second air inlet of the adsorption tower is communicated with the first air outlet of the air pump, and the second air outlet of the adsorption tower is communicated with the fresh-keeping chamber;

wherein the air pump is operated continuously during the cycle time to continuously discharge oxygen to the fresh food compartment.

2. The oxygen circulation and discharge device of claim 1, wherein the first inlet of the air pump has an inlet flow rate of 3L/min to 10L/min, and the outlet flow rate of the oxygen discharge port is 0.1L/min to 0.5L/min.

3. The oxygen circulation and discharge device of claim 1, wherein the pressure of the air pump is 30KPa to 100 KPa.

4. The oxygen circulation and discharge device of claim 1, wherein the oxygen circulation and discharge device comprises at least two buffer tanks, the at least two buffer tanks are sequentially communicated, the air inlet of the first buffer tank of the at least two buffer tanks is communicated with the second air outlet of the adsorption tower, and the air outlet of the last buffer tank is communicated with the fresh-keeping chamber.

5. The oxygen circulation and discharge device of claim 4, wherein the oxygen circulation and discharge device comprises a valve assembly, the first outlet of the air pump is connected to the second inlet of the adsorption tower through an inlet channel of the valve assembly, and the second outlet of the adsorption tower is connected to the fresh food compartment through an outlet channel of the valve assembly.

6. The circulating oxygen exhausting device of claim 5, wherein the circulating oxygen exhausting device comprises an oxygen storage tank, and the oxygen exhausting port of the adsorption tower is communicated with the oxygen storage tank.

7. The circulating oxygen discharging device of claim 6, wherein the adsorption tower, the buffer tank and the oxygen storage tank are all cylindrical, have the same height, and are arranged side by side at the same horizontal height.

8. The oxygen circulation and discharge device of claim 7, wherein the adsorption tower, the buffer tank and the oxygen storage tank are all 20mm to 40mm in diameter and 100mm to 160mm in height;

9. The cyclic oxygen exhausting apparatus of claim 8, wherein the adsorption tower, the buffer tank and the oxygen storage tank are formed of an integrated tank tower and a bottom plate, the tank tower includes a plurality of cavities forming the adsorption tower, the buffer tank and the oxygen storage tank, and the bottom plate is covered on the tank tower to seal the cavities and make the cavities form the adsorption tower, the buffer tank and the oxygen storage tank isolated from each other, respectively.

10. The circulating oxygen exhausting device of claim 9, wherein the second gas inlet and the second gas outlet of the adsorption tower are arranged at the top end of the adsorption tower, and the oxygen exhausting port is arranged at the bottom end of the adsorption tower; the air inlet and the air outlet of the buffer tank are both arranged at the top end of the buffer tank; the air inlet of the oxygen storage tank is arranged at the bottom end of the oxygen storage tank;

the circulating oxygen discharging device comprises a gas circuit board which is arranged at the top ends of the adsorption tower, the buffer tank and the oxygen storage tank; a first air path, a second air path and a third air path are formed on the air path board, the first air path is communicated with a second air outlet of the adsorption tower and the air outlet channel of the valve assembly, and the second air path is communicated with the air outlet channel of the valve assembly and the first buffer tank; and the third air path is communicated with the air inlet channel of the valve assembly and the second air inlet of the adsorption tower.

11. The oxygen circulation exhaust device according to claim 5, further comprising a control device connected to the valve assembly,

the control equipment controls the air inlet channel of the valve component to be opened, so that the air pump transmits the air in the fresh-keeping chamber to the adsorption tower in a pressurized manner, the adsorption tower filters oxygen in the air, the oxygen is discharged from a second air outlet of the adsorption tower, and residual air is adsorbed; the control equipment controls the air inlet channel of the valve assembly to be closed, so that the air pump stops pressurizing and transmitting the air to the adsorption tower, the adsorption tower releases the residual air, and the residual air is discharged to the fresh-keeping chamber through the second air inlet of the adsorption tower and the air outlet channel of the valve assembly.

12. The oxygen circulating and discharging device of claim 11, wherein said control means comprises an oxygen detector for detecting the oxygen content of said fresh food compartment, said control means controlling the operation of said air pump and said valve assembly based on the oxygen content of said fresh food compartment; and/or the presence of a gas in the gas,

the control equipment comprises an opening and closing detector used for detecting the opening and closing condition of the fresh-keeping chamber, and the control equipment controls the operation of the air pump and the valve assembly based on the opening and closing condition of the fresh-keeping chamber.

13. The cyclic oxygen extraction device according to claim 5, wherein the adsorption tower comprises two adsorption towers, and the two adsorption towers are divided into a first adsorption tower and a second adsorption tower; the valve assembly is provided with a first air inlet channel and a first air outlet channel corresponding to each first adsorption tower, and is provided with a second air inlet channel and a second air outlet channel corresponding to each second adsorption tower; and alternately controlling the opening of the first air inlet channel and the closing of the second air inlet channel in the valve assembly, or controlling the closing of the first air outlet channel and the opening of the second air outlet channel.

14. A kitchen appliance, characterized in that, the kitchen appliance includes the circulation oxygen exhausting device of any one of claims 1-13, the circulation oxygen exhausting device is communicated with a fresh keeping chamber in the kitchen appliance, the fresh keeping chamber is provided with a one-way valve, and air outside the fresh keeping chamber can enter the interior through the one-way valve.