CN114532866A - Oxygen control device and kitchen appliance - Google Patents

Abstract

The application discloses an oxygen control device and a kitchen appliance. The oxygen control device includes an adsorption tower and at least two buffer tanks: the adsorption tower includes an air inlet, an air outlet and an oxygen outlet, and the air inlet of the adsorption tower is connected to the control Oxygen space; at least two buffer tanks are connected in sequence, the air inlet of the first buffer tank of the at least two buffer tanks is connected to the air outlet of the adsorption tower, and the air outlet of the last buffer tank is connected to the oxygen control space. The present application can reduce the noise generated by the oxygen control device.

Description

An oxygen control device and kitchen appliance

technical field

The present application relates to the technical field of preservation, in particular to an oxygen control device and a kitchen appliance.

Background technique

In the preservation of fruits and vegetables in long-distance transportation and storage, reducing oxygen and filling nitrogen to preserve freshness has been widely used at home and abroad. However, in the field of home appliances, due to technical limitations, such as high noise, it has not been effectively used.

SUMMARY OF THE INVENTION

The present application provides an oxygen control device and a kitchen appliance to solve the technical problem that the internal oxygen control device of the kitchen appliance is noisy in the prior art.

In order to solve the above-mentioned technical problems, a technical solution adopted in this application is to provide an oxygen control device, which is used to discharge oxygen to the oxygen control space, and the oxygen control device includes an adsorption tower and at least two buffer tanks:

The adsorption tower includes an air inlet, an air outlet and an oxygen outlet, and the air inlet of the adsorption tower is connected to the oxygen control space;

The at least two buffer tanks are connected in sequence, the air inlet of the first buffer tank of the at least two buffer tanks is connected to the air outlet of the adsorption tower, and the air outlet of the last buffer tank is connected to the oxygen control space.

Among them, the air outlet flow rate of the oxygen exhaust port is 0.1L/min～0.5L/min, and the air intake flow rate of the air inlet port of the air pump is 3L/min～10L/min.

Among them, the oxygen control device includes an air pump and a valve;

The air inlet of the air pump is connected to the oxygen control space, the air outlet of the air pump is connected to the air inlet of the adsorption tower through the air inlet channel of the valve, and the air outlet of the adsorption tower is connected to the oxygen control space through the air outlet channel of the valve.

Wherein, the oxygen control device further includes an oxygen storage tank, and the oxygen outlet of the adsorption tower is connected to the oxygen storage tank.

Among them, 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 level.

Among them, the adsorption tower, buffer tank and oxygen storage tank are composed of an integrated tank tower and bottom plate, the tank tower includes a plurality of cavities that constitute the adsorption tower, buffer tank and oxygen storage tank, and the bottom plate is covered on the tank tower to seal multiple A cavity is formed, and a plurality of cavities are respectively formed into an adsorption tower, a buffer tank and an oxygen storage tank which are isolated from each other.

Among them, the air inlet and air outlet of the adsorption tower are arranged at the top of the adsorption tower, and the oxygen outlet is arranged at the bottom end of the adsorption tower; the air inlet and air outlet of the buffer tank are both arranged at the top of the buffer tank; The air inlet is arranged at the bottom end of the oxygen storage tank; the oxygen control device includes a gas circuit board, which is arranged on the top of the adsorption tower, the buffer tank and the oxygen storage tank; the gas circuit board is formed with a first gas path, a second gas path and The third gas path, the first gas path is connected to the air outlet of the adsorption tower and the air outlet channel of the valve, the second air path is connected to the air outlet channel of the valve and the first buffer tank; the third air path is connected to the inlet channel of the valve and the adsorption tower air intake.

Among them, the diameter of the adsorption tower, the buffer tank and the oxygen storage tank are all 20mm-40mm, and the heights are all 100mm-160mm.

Wherein, the adsorption tower is provided with zeolite molecular sieve particles, and the size of the zeolite molecular sieve particles is 0.4mm-0.8mm; the air pump pressurizes the air to 30KPa-100KPa.

Wherein, the oxygen control device also includes control equipment, the control equipment is connected to the valve,

The control equipment controls the valve inlet channel to open, so that the air pump pressurizes the air in the oxygen control space to the adsorption tower, and the adsorption tower filters out the oxygen in the air, discharges it from the air outlet of the adsorption tower, and absorbs the remaining gas; the control equipment controls the valve The air inlet channel of the adsorption tower is closed, so that the air pump stops pressurizing and transmitting air to the adsorption tower, and the adsorption tower releases the residual gas, which is discharged to the oxygen control space through the air inlet of the adsorption tower and the air outlet channel of the valve.

Wherein, the control device includes an oxygen detector for detecting the oxygen content of the oxygen control space, and the control device controls the operation of the air pump and the valve based on the oxygen content of the oxygen control space.

Among them, there are two adsorption towers, and the two adsorption towers are divided into a first adsorption tower and a second adsorption tower; the valve corresponding to each first adsorption tower has a first air inlet channel and a first air outlet channel, corresponding to each first adsorption tower. The two adsorption towers have a second inlet channel and a second outlet channel; alternately control the valve in which the first inlet channel is opened and the second inlet channel is closed, or the first outlet channel is closed and the second inlet channel is opened.

In order to solve the above technical problem, a technical solution adopted in the present application is to provide a kitchen appliance, which includes the above-mentioned oxygen control device.

The oxygen control device of the present application includes an adsorption tower and at least two buffer tanks connected in sequence, the adsorption tower is connected to the first buffer tank through the gas outlet channel of the second valve, and the residual gas passes through the first buffer tank, and then flows from the first buffer tank to the first buffer tank. The air outlet of the buffer tank comes out, and the residual gas realizes a buffer. The residual air from the first buffer tank enters the air inlet of the second buffer tank, passes through the second buffer tank, and then flows from the second buffer tank. It comes out of the air outlet of the adsorption tower to realize secondary buffering until it comes out from the air outlet of the last buffer tank to realize at least two buffering, so that the residual gas discharged from the air outlet of the adsorption tower is buffered at least twice through at least two buffer tanks, and The last buffer tank supplies the buffered residual gas to the oxygen control space, which greatly reduces the flow rate of the residual gas and greatly reduces the noise caused by the excessively fast residual gas flow rate.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

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

Fig. 2 is an exploded schematic diagram of an oxygen control device according to an embodiment of the present application;

3 is a schematic diagram of the installation of an air pump in an oxygen control device according to an embodiment of the present application;

4 is a schematic diagram of gas flow in an oxygen control device according to an embodiment of the present application;

5 is a schematic diagram of a gas circuit in an oxygen control device according to an embodiment of the present application;

6 is a schematic diagram of a gas path plate in an oxygen control device according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of an oxygen control device according to another embodiment of the present application.

Detailed ways

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. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of this application.

It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) involved in the embodiments of the present application, the directional indications are only used to explain a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly.

In addition, if there are descriptions related to "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for the purpose of description, and should not be construed as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection claimed in this application.

Please refer to FIG. 1 , the kitchen appliance 1 includes an oxygen control space 10 and an oxygen control device 20 . The oxygen control device 20 discharges oxygen from the gas in the oxygen control space 10 and returns it to the oxygen control space 10. The oxygen control device 20 discharges oxygen from the gas in the oxygen control space 10 to reduce the gas in the oxygen control space 10. oxygen content, so as to achieve oxygen control and preservation. The oxygen control device 20 of the present application can remove 70% to 93% of the oxygen in the gas in the oxygen control space 10 .

Wherein, the kitchen appliance 1 of the present application may be a household appliance such as a refrigerator, an oven or a juicer, which needs to be kept fresh by reducing the oxygen content.

For example, the oven includes a baking cavity and an oxygen control device 20 , wherein the baking cavity of the oven can be used as the oxygen control space 10 , and the oxygen control device 20 is communicated with the baking cavity, so that the gas in the baking cavity can be controlled by the oxygen control device 20 . The oxygen content is controlled at a low level to keep the fruits and vegetables fresh when they are roasted and prevent the fruits and vegetables from oxidative discoloration.

For another example, the juice machine includes a juice extraction chamber and an oxygen control device 20 , wherein the juice extraction chamber of the juice machine can be used as the oxygen control space 10 , and the oxygen control device 20 is communicated with the juice extraction chamber, so that the juice is extracted through the oxygen control device 20 . The oxygen content of the gas in the cavity is controlled at a low level, so as to preserve the freshness of the fruits and vegetables when juicing the fruits and vegetables, and prevent the fruits and vegetables from being oxidized and resulting in discoloration of the juice. Preferably, the oxygen control device 20 can communicate with the opening at the top of the juice extraction chamber. In addition, the oxygen control device 20 can discharge oxygen to the gas in the juice extraction chamber of the juice machine after the juice machine is charged and before the juice is extracted.

The oxygen control space 10 may be a non-closed space. The oxygen control space 10 can be communicated with the outside air through a one-way valve, wherein, when the oxygen control device 20 draws gas from the oxygen control space 10 to cause the air pressure of the oxygen control space 10 to be lower than the air pressure outside the oxygen control space 10, the oxygen control space 10 is outside the air pressure. The air will enter the oxygen control space 10 through the one-way valve to keep the oxygen control space 10 at normal pressure, so that there will not be a large pressure difference inside and outside the oxygen control space 10, so that the outer wall of the oxygen control space 10 does not need to withstand a large pressure. Therefore, there is no need to require the material for making the outer wall of the oxygen control space 10 to have high strength or to adopt a complex and special structure, which reduces the manufacturing cost of the oxygen control space 10; and the nitrogen-rich gas in the oxygen control space 10 will not pass through the single The flow of the valve to the outside of the oxygen control space 10 can prevent excessive oxygen from entering the oxygen control space 10, so as to ensure the oxygen discharge efficiency. Among them, the one-way valve works automatically. Under the action of the gas pressure flowing from the outside to the oxygen control space 10, the valve flap in the one-way valve opens; and when the gas flows in the opposite direction, that is, the gas flows from the oxygen control space 10 to the When the oxygen control space 10 is outside, the pressure of the gas flowing from the oxygen control space 10 to the outside world and the self-overlapping valve flap of the valve flap act on the valve seat, thereby cutting off the flow.

Of course, in other embodiments, the oxygen control space 10 may be a closed space, so that the air in the oxygen control space 10 is not communicated with the atmosphere, so that at least part of the oxygen in the air in the oxygen control space 10 can be removed and removed again. The air after the oxygen is returned to the oxygen control space 10, which can reduce the oxygen content of the oxygen control space 10, and can achieve oxygen control and freshness; and can reduce the total air content in the oxygen control space 10, so that the air in the oxygen control space 10 can be reduced In a negative pressure state, negative pressure preservation can be achieved, that is, the dual preservation effect of oxygen control preservation and negative pressure preservation can be achieved, so as to achieve a better preservation effect.

One or more oxygen control spaces 10 may be provided. The oxygen control space 10 may be an oxygen control space 10 for storing vegetables, fruits and other ingredients. By controlling the oxygen content of the oxygen control space 10 at a low level, the respiration rate of the food materials stored therein can be reduced, the metabolism of the food materials can be inhibited, the preservation effect can be achieved, and deterioration and the reproduction of bacteria can be inhibited.

As shown in FIG. 1 , optionally, the oxygen control space 10 is arranged in the kitchen appliance 1 in the form of a drawer, and the oxygen control device 20 is arranged behind the oxygen control space 10 , that is, the oxygen control device 20 is arranged in the oxygen control space 10 away from the kitchen One side of the door of the electrical appliance 1 so that when the oxygen control space 10 is opened, the position of the oxygen control device 20 will not be affected, and the connection relationship between the internal components of the oxygen control device 20 will not be affected. In other embodiments, the oxygen control space 10 may be constituted by a cavity built into the body, and the refrigerator may further include a door for opening and closing the oxygen control space 10 .

In this embodiment, the kitchen appliance 1 further includes an oxygen-enriched space. The oxygen control device 20 is connected to the oxygen-enriched space, and the oxygen-enriched space can receive the oxygen-enriched gas discharged from the oxygen control space 10, so that the oxygen content of the oxygen-enriched space is increased. The oxygen-enriched space can store meat ingredients, and by increasing the oxygen content in the oxygen-enriched space, the fresh-keeping color of the meat stored in the oxygen-enriched space can be more vivid.

Please refer to FIG. 2 , which is a schematic structural diagram of an embodiment of the oxygen control device 20 of the present application. As shown in FIG. 2 , the oxygen control 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 connected to the oxygen control space 10, and the air outlet of the adsorption tower 21 is connected to the oxygen control space 10. The gas in the oxygen control space 10 enters the adsorption tower 21 through the air inlet of the adsorption tower 21, and the adsorption tower 21 The gas entering the oxygen control space 10 is discharged into the oxygen control space 10, and the oxygen discharged gas is returned to the oxygen control space 10 through the air outlet of the adsorption tower 21, and the filtered oxygen is discharged through the oxygen discharge port.

Optionally, the oxygen control device 20 may further include an air pump 22 . The air pump 22 includes an air inlet and an air outlet, and the air inlet of the air pump 22 is communicated with the oxygen control space 10 . The air outlet of the air pump 22 is communicated with the air inlet of the adsorption tower 21. The air pump 22 pressurizes the air in the oxygen control space 10 and transmits it to the adsorption tower 21, and the adsorption tower 21 discharges oxygen and returns to the air pressured by the air pump 22. In the oxygen control space 10, oxygen is discharged from the air in the oxygen control space 10 through the air pump 22 and the adsorption tower 21, so as to reduce the oxygen content of the gas in the oxygen control space 10, so as to realize the oxygen control and freshness preservation.

Optionally, as shown in FIG. 3 , the oxygen control device 20 may further include an air pump housing 23, and the air pump 22 is completely sealed in the air pump housing 23, so as to shield the noise generated by the operation of the air pump 22 through the air pump housing 23, so as to prevent the air pump 22 from operating. Reduce noise. In addition, the air pump 22 can be fixed in the air pump housing 23 through the rubber pad 24, so as to reduce the vibration of the air pump 22 during operation through the rubber pad 24, thereby achieving the effect of reducing the vibration sound and effectively reducing the noise. Further, the air pump 22 can be vertically fixed inside the air pump housing 23 , and the upper end and the lower end of the air pump 22 are positioned and fixed by a rubber pad 24 respectively. Wherein, the hardness of the rubber pad 24 may be 27-39°, for example, may be 30° or 35°.

It can be understood that in the present application, the oxygen control device 20 can be used to cyclically discharge oxygen in the gas in the oxygen control space 10, so as to continue to operate within the cycle time, so that the gas in the oxygen control space 10 can be continuously discharged to gradually remove oxygen. The oxygen content of the gas in the oxygen control space 10 is reduced, so that the adsorption tower 21 does not need to remove a large amount of oxygen from the pressurized gas at one time, and the adsorption tower 21 can discharge a small amount of oxygen in the pressurized gas each time. , the oxygen content of the gas in the oxygen control space 10 can be reduced to a lower level through the repeated oxygen discharge of the cycle, so that the air pump 22 may not pressurize the air in the oxygen control space 10 to a higher pressure value, and then the present application A small air pump 22 can be used to reduce the noise caused by oxygen control and preservation.

It can be understood that, in the process of cyclic oxygen removal, the oxygen control device 20 is used to return the gas discharged by the oxygen control device 20 to the oxygen control space 10, and is used to control the oxygen discharged gas in the oxygen control space 10. Oxygenate again. Specifically, the air pump 22 can be used to pressurize and supply the air extracted from the oxygen control space 10 and/or the oxygen-exhausted gas to the adsorption tower 21, and the adsorption tower 21 is used to pressurize the air and/or the air pressurized by the air pump 22. Or the oxygen-exhausted gas is exhausted, and the oxygen-exhausted gas is supplied to the oxygen control space 10 again.

In addition, through the oxygen control device 20 for circulating oxygen in the oxygen control space 10 provided with the one-way valve, the air pump 22 can only extract a relatively small amount of gas in the oxygen control space 10 per unit time, so that only a The one-way valve supplements a small amount of outside air into the oxygen control space 10, so that only a small amount of oxygen is added into the oxygen control space 10, which will not have a great impact on reducing the oxygen content of the gas in the oxygen control space 10, so that The pressure balance of the oxygen control space 10 can be ensured, and the oxygen content of the gas in the oxygen control space 10 can be reduced to a lower level by circulating oxygen efficiently.

Optionally, the present application can discharge oxygen from the air in the oxygen control space 10 by adsorbing nitrogen and excluding oxygen in the adsorption tower 21, wherein, when the adsorption tower 21 is adsorbed, nitrogen is adsorbed, and the air pressure pressurized by the air pump 22 is filtered out. The oxygen in the gas in the oxygen space 10 is discharged from the oxygen outlet of the adsorption tower 21; when the adsorption tower 21 is desorbed, the residual gas that removes oxygen is released, and the residual gas is returned through the air outlet of the adsorption tower 21 To the oxygen control space 10, the pressure swing adsorption oxygen production technology is reversely applied to the oxygen control device 20. Compared with the oxygen generator, it does not use oxygen, and the application does not need to extract high-purity oxygen, so the oxygen control device 20 The air pump 22 does not need to pressurize the gas in the oxygen control space 10 to a higher pressure in order to obtain the gas with extremely high oxygen content, and it is not necessary to extract oxygen at one time, and the oxygen control space 10 can be carried out in the way of continuous circulating oxygen discharge. To discharge oxygen, the air pump 22 can pressurize the gas in the oxygen control space 10 to a lower pressure, for example, to 0.03MPa-0.10MPa, so that the small air pump 22 can reduce the oxygen content of the gas in the oxygen control space 10 to At a lower level, the miniaturization of the oxygen control device 20 is realized, and low-pressure separation is realized, thereby fundamentally reducing the noise caused by oxygen control and preservation, and the power consumption of the air pump 22 is reduced, and the air pump 22 will not generate too much heat and affect the life of the air pump 22. . In addition, the gas in the oxygen control space 10 is cyclically discharged by means of the adsorption tower 21 adsorbing nitrogen and removing oxygen, which can effectively reduce the oxygen content of the gas in the oxygen control space 10 . In addition, compared with the oxygen-enriched membrane oxygen-exhausting method that can only exhaust up to 28% of oxygen, the method of adsorbing nitrogen through the adsorption tower 21 to exhaust oxygen in the present application can exhaust about 70%-93% of the oxygen in the oxygen-controlled space 10. , the oxygen discharge efficiency is high, and there is no need to supplement a large amount of air outside the oxygen control space 10, which ensures the oxygen discharge efficiency.

In other implementation manners, the present application may discharge oxygen from the air in the oxygen control space 10 by means of the adsorption tower 21 adsorbing oxygen and removing oxygen. Among them, when the adsorption tower 21 is adsorbed, it adsorbs oxygen, filters out the residual gas after removing the oxygen, and returns the residual gas after removing the oxygen to the oxygen control space 10 through the gas outlet of the adsorption tower 21; when the adsorption tower 21 is desorbed, it releases the adsorption oxygen, and the oxygen is discharged through the oxygen outlet of the adsorption tower 21. Of course, in the present application, an electrolytic membrane, etc. can also be placed in the adsorption tower 21 to consume oxygen in the air of the oxygen control space 10 through the electrolytic membrane, etc., and the residual gas after the oxygen is discharged is returned to the air outlet of the adsorption tower 21. Oxygen control space 10.

For ease of description, the following content will describe in detail the oxygen control device 20 of the adsorption tower 21 that uses adsorbed nitrogen to realize oxygen exhaust. It can be understood that the following at least part of the scheme can also be applied to the oxygen control device 20 of the adsorption tower 21 using adsorbed oxygen to realize the oxygen discharge and the adsorption tower 21 using the electrolytic membrane to realize the oxygen discharge. Oxygen control device 20 and so on.

In order to facilitate the control of the adsorption and desorption process of the adsorption tower 21, the valve assembly 25 can be used to switch the adsorption and desorption states of the adsorption tower 21 in the present application. The air outlet of the air pump 22 is connected, and the air outlet of the adsorption tower 21 can be communicated with the oxygen control space 10 through the air outlet passage of the valve assembly 25. When the air inlet passage of the valve assembly 25 is opened and the air outlet passage of the valve assembly 25 is closed, the air pump 22 The air in the oxygen control space 10 is pressurized and transmitted to the adsorption tower 21 through the inlet passage of the valve assembly 25. The adsorption tower 21 is in the adsorption state, and the adsorption tower 21 adsorbs nitrogen in the air, filters out the oxygen in the air, and makes the oxygen from the air. The oxygen outlet of the adsorption tower 21 is discharged; when the air inlet passage of the valve assembly 25 is closed and the air outlet passage of the valve assembly 25 is opened, the air pump 22 stops pressurizing and transporting air to the adsorption tower 21, the adsorption tower 21 is in a desorption state, and the adsorption tower 21 The residual gas is released and discharged to the oxygen control space 10 through the gas outlet of the adsorption tower 21 and the gas outlet channel of the valve assembly 25 . Optionally, the valve assembly 25 of the present application may include a first valve 251 and a second valve 252 , wherein the outlet passage is arranged in the first valve 251 and the inlet passage is arranged in the second valve 252 . Of course, in other implementations, the air outlet channel and the air intake channel can also be provided in the same valve assembly 25 .

In order to reduce the oxygen content in the oxygen control space 10 with high efficiency and low time consumption, at least two adsorption towers 21 can be provided in the oxygen control device 20, and the air in the oxygen control space 10 can be continuously controlled by the at least two adsorption towers 21. Oxygen is discharged, and the residual gas adsorbed by the adsorption tower 21 can be continuously desorbed into the oxygen control space 10, so as to control the oxygen content in the oxygen control space 10 with high efficiency and low time consumption.

Wherein, the at least two adsorption towers 21 may include a first adsorption tower and a second adsorption tower. When switching the adsorption and desorption states of one adsorption tower 21 through the first valve 251 and the second valve 252, the first valve 251 has a first inlet channel corresponding to each first adsorption tower, and corresponding to each second adsorption tower has a A second inlet channel; the second valve 252 has a first outlet channel corresponding to each first adsorption tower, and a second outlet channel corresponding to each second adsorption tower. The first air inlet passage and the second air inlet passage in the first valve 251 are alternately opened, and the second air outlet passage and the first air outlet passage are alternately opened, and when the first air inlet passage is opened, the first air outlet passage is controlled to close and the second air outlet passage is controlled. The outlet channel is opened, and when the second inlet channel is opened, the second outlet channel is controlled to be closed and the first outlet channel is controlled to be opened, so that when one of the first adsorption tower and the second adsorption tower is adsorbed, the first adsorption tower and the second adsorption tower are adsorbed. The residual gas desorbed from the adsorption tower and the second adsorption tower flows into the oxygen control space 10 through the gas outlet channel to control the oxygen content in the oxygen control space 10 with high efficiency and low time consumption.

Further, the number of adsorption towers 21 is two. The first valve 251 and the second valve 252 are both two-position three-way solenoid valves, and the opening and closing of the first air outlet channel and the second air outlet channel inside the first valve 251 can be freely switched through the two-position three-way electromagnetic valve, or The opening and closing of the first inlet passage and the second inlet passage in the second valve 252 can be freely switched, so as to switch the working states of the two adsorption towers 21, so that the first adsorption tower and the second adsorption tower can be connected When one of the adsorption towers is adsorbed, the residual gas desorbed from the other one of the first adsorption tower and the second adsorption tower flows into the oxygen control space 10 through the gas outlet channel, so that the first valve 251 and the second valve 252 can be controlled. The operation of the air pump 22 can continuously discharge oxygen from the air in the oxygen control space 10, and can continuously desorb and transfer the residual gas adsorbed by the adsorption tower 21 to the oxygen control space 10, so as to control the oxygen control space 10 with high efficiency and low time consumption. The oxygen content in the oxygen control space 10 .

In this embodiment, the adsorption tower 21 may be provided with adsorption substances. When the adsorption material set in the adsorption tower 21 is in the adsorption state, the adsorption capacity of the adsorption material for nitrogen is greater than the adsorption capacity for oxygen. The adsorption material arranged in the adsorption tower 21 may be zeolite molecular sieve particles. The polarity of nitrogen in the air is larger than that of oxygen. Zeolite molecular sieves have different adsorption capacities for oxygen and nitrogen components in the air. Nitrogen can be preferentially adsorbed from the air through zeolite molecular sieves, and the oxygen in the air can be filtered out. Air enters from the air inlet of the adsorption tower 21, and after adsorption by the zeolite molecular sieve, the oxygen content in the air flowing out from the adsorption tower 21 exceeds the oxygen content in the air. Furthermore, the oxygen content in the gas desorbed from the zeolite molecular sieve is significantly lower than the oxygen content in the air, that is, the gas desorbed from the zeolite molecular sieve is a gas with low oxygen content, and the gas desorbed from the zeolite molecular sieve is transferred to the oxygen control space. 10, the oxygen content in the oxygen control space 10 can be reduced, and the preservation effect can be improved. The size of the zeolite molecular sieve particles may be 0.4 mm˜0.8 mm, for example, may be 0.5 mm, 0.6 mm, 0.7 mm. Of course, in other embodiments, the adsorption material set in the adsorption tower 21 may also be a silicoaluminophosphate molecular sieve.

That is, in the present application, the oxygen content of the oxygen control space 10 is controlled by the adsorption and desorption of the adsorption tower 21. Since the adsorption material has the characteristic that the adsorption amount increases with the increase of the partial pressure of the adsorbed component, the adsorption is completed by the pressure change in this embodiment. Air separation is achieved by desorption and desorption, that is, the adsorption tower 21 is in an adsorption or desorption state through pressure changes. Specifically, in this 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, and the pressure in the adsorption tower 21 is increased in a disguised form, so that the adsorption tower 21 is in the adsorption tower 21. At this stage, even if the adsorption tower 21 filters out at least part of the oxygen in the compressed air, when the air pump 22 no longer transmits the compressed air into the adsorption tower 21, the pressure of the adsorption tower 21 is reduced, and the adsorption tower 21 absorbs nitrogen and other substances. When the adsorption capacity decreases, the adsorption tower 21 will desorb the adsorbed substances, and flow into the oxygen control space 10 through the air inlet of the adsorption tower 21 and the air outlet channel of the second valve 252, that is, the adsorption tower 21 will be desorbed. The residual gas flows into the first oxygen control space 10, so that the oxygen content in the oxygen control space 10 is reduced, and oxygen control and freshness preservation can be realized. Corresponding to the particle size of the zeolite molecule, in this embodiment, the air pump 22 can pressurize the air to 0.03MPa-0.2MPa to ensure that the adsorption tower 21 can filter out at least part of the oxygen in the compressed air under this pressure. Further, when the oxygen content of the gas in the oxygen control space 10 is gradually reduced by the use of circulating oxygen, the air pump 22 can pressurize the air to 0.03MPa～0.10MPa, such as 40KPa, 60KPa, 75KPa, etc., so as to circulate the air through the small air pump 22. The secondary oxygen discharge reduces the oxygen content of the gas in the oxygen control space 10 to a lower level, and realizes low-pressure separation, thereby fundamentally reducing the noise caused by oxygen control and preservation.

The corresponding relationship between the particle size of the zeolite molecular sieve and the pressurization of the air by the air pump 22 can realize the miniaturization of the air pump 22, reduce the power consumption of the oxygen control device 20, and reduce the noise. If the particle size of the zeolite molecular sieve is too small, the airflow transmission resistance will be too large, and the pressure needs to be appropriately increased. Therefore, the particle size of the zeolite molecules filled in the adsorption tower 21 should be relatively uniform and moderate. For example, the size of the zeolite molecular sieve particles is set to 0.4 mm to 0.8 mm, and the pressure in the adsorption tower 21 is 0.03 MPa to 0.10 MPa. The oxygen is filtered out, so that the air pump 22 does not need to increase excessive pressure on the air, the miniaturization of the air pump 22 can be realized, the power consumption of the oxygen control device 20 can be reduced, and the noise can be reduced.

In this embodiment, the adsorption tower 21 can be cylindrical, and with the cylindrical adsorption tower 21, under the condition of the same floor space, the cylindrical volume is larger, more zeolite molecular sieves can be accommodated, and the air flow is smoother evenly. Of course, the adsorption tower 21 may also have other regular or irregular shapes such as a cube, a cuboid, and the like.

The adsorption capacity of the adsorption tower 21 can be controlled by controlling the size of the adsorption tower 21. When the size of the adsorption tower 21 is controlled within an appropriate range, the adsorption capacity of the adsorption tower 21 can be ensured and a small volume can be maintained. The tower 21 and the zeolite molecular sieve can be matched to a small air pump 22, and the air pump 22 and the adsorption tower 21 can be integrated together, which can realize the optimization of the overall structure. Specifically, the diameter of the adsorption tower 21 may range from 20mm to 40mm. The height range of the adsorption tower 21 can be 100mm-160mm, to avoid that the volume of the adsorption tower 21 is too large and the air pump 22 needs a higher working pressure, and it also avoids that the volume of the adsorption tower 21 is too small to filter a small amount of gas. The removal of residual gas leads to low oxygen discharge efficiency, which can also ensure that the gas with a transmission flow of 30KPa-100KPa of 3L/min~15L/min enters the adsorption tower 21 of this size. filtration efficiency. Alternatively, the diameter of the adsorption tower 21 may be 20mm, 24mm, 29mm, 32mm or 37mm. The height of the adsorption tower 21 may be 120mm, 135mm, 140mm, 150mm or 155mm.

Corresponding to the small size design of the adsorption tower 21, the transmission flow of the air pump 22 is also designed accordingly. The contact time between the molecules in the compressed air and the adsorbed substances in the adsorption tower 21 can be changed by changing the transmission flow of the air pump 22 , thereby changing the adsorption efficiency of the adsorption tower 21 for the compressed air. If the transmission speed is too fast, the contact time between the molecules in the compressed air and the adsorbent will be too short, which is not conducive to the adsorption of gas and reduces the adsorption rate; if the transmission speed is too low, the volume of the adsorption tower 21 will increase. Therefore, the transmission flow should be controlled within a certain range. In this embodiment, the transmission flow of the air pump 22 is 3L/min˜15L/min, specifically 5L/min, 8L/min or 10L/min. Certainly, in order to maintain the adsorption efficiency of the adsorption tower 21 , the ratio of the transmission flow of the air pump 22 per second to the volume of the adsorption tower 21 may be 1.2˜2.2.

In this embodiment, the gas outlet flow rate of the oxygen exhaust port is 0.1L/min～0.5L/min, so that the oxygen control device 20 discharges oxygen-enriched gas at a small flow rate through the oxygen exhaust port, so that the oxygen control device 20 can be discharged through the oxygen exhaust port at a small flow rate. In the case of a certain amount of oxygen, reduce the total amount of gas discharged from the oxygen exhaust port, so as to ensure that the oxygen content of the gas discharged from the oxygen exhaust port is relatively high, and avoid the discharge of a large amount of non-oxygen gas through the oxygen exhaust port, thereby ensuring control. The oxygen removal efficiency of the oxygen device 20 to the oxygen control space 10 . In addition, the ratio of the outflow flow rate of the oxygen exhaust port to the intake air flow rate of the air intake port of the air pump 22 is 1/100 to 1/6.

In addition, corresponding to the low-noise design of the oxygen control device 20, the oxygen control device 20 of the present application may further include a buffer tank 26, and the buffer tank 26 is used to buffer the residual gas discharged from the air outlet of the adsorption tower 21, thereby reducing the residual gas flow rate to reduce noise. Further, the buffer tank 26 of the present application can be at least two buffer tanks 26 connected in sequence, the adsorption tower 21 is connected to the first buffer tank 26 through the gas outlet channel of the second valve 252, and the residual gas 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 a buffer, and the residual air from the first buffer tank 26 enters the air inlet of the second buffer tank 26, and passes through the second buffer tank 26. tank 26, and then come out from the air outlet of the second buffer tank 26 to achieve secondary buffering, until it comes out from the air outlet of the last buffer tank 26 to achieve at least two buffers, so that the adsorption tower is buffered by at least two buffer tanks 26. 21 The residual gas discharged from the air outlet is buffered at least twice, and the buffered residual gas is supplied to the oxygen control space 10 by the last buffer tank 26, so that the flow rate of the residual gas is greatly reduced. The noise caused by the fast, and the impact of the gas with a higher flow rate on the objects in the oxygen control space 10 can be avoided, so as to protect the objects in the oxygen control space 10 . For example, as shown in FIG. 4 , the oxygen control device 20 includes a first buffer tank 261 and a second buffer tank 262. After the residual gas discharged from the adsorption tower 21 is buffered once by the first buffer tank 261, the residual gas enters the second buffer. The tank 262 is used for secondary buffering of the residual gas through the second buffer tank 262, so as to reduce the flow rate of the residual gas and reduce the noise.

In this embodiment, the buffer tank 26 may be cylindrical. Of course, the buffer tank 26 may also have other regular or irregular shapes such as a cube, a cuboid, and the like. The diameter of the buffer tank 26 may range from 20mm to 40mm. The height of the buffer tank 26 may range from 100mm to 160mm.

The diameter of the air outlet and the air inlet of each buffer tank 26 is about 0.5-5 mm, so as to reduce the flow rate of the residual air entering and leaving each buffer tank 26 by limiting the diameter of the air outlet and the air inlet of the buffer tank 26 , thereby Effectively buffer residual air.

In addition, the oxygen control device 20 of the present application can also include an oxygen storage tank 27, and the air inlet of the oxygen storage tank 27 is connected to the oxygen outlet of the adsorption tower 21 through a valve, so that when the air inlet passage 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 outlet, and the flow rate of the oxygen entering the oxygen storage tank 27 from the adsorption tower 21 is controlled by a valve; The oxygen in the oxygen tank 27 flows into the adsorption tower 21 through the oxygen outlet, and the oxygen in the gas storage tank is back flushed with the adsorption material in the adsorption tower 21, so that the adsorption tower 21 desorbs the residual gas and returns it through the gas outlet channel of the second valve 252 to the oxygen control space 10, and control the flow of oxygen from the gas storage tank into the adsorption tower 21 through a valve to control the flow of backwashing.

In this embodiment, the oxygen storage tank 27 may be cylindrical. Of course, the oxygen storage tank 27 may also have other regular or irregular shapes such as a cube, a cuboid, and the like. The diameter of the oxygen storage tank 27 may range from 20mm to 40mm. The height of the oxygen storage tank 27 may range from 100mm to 160mm.

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

Optionally, the adsorption tower 21, the buffer tank 26 and the oxygen storage tank 27 can be composed of an integrated tank tower and bottom plate, so that the adsorption function, the buffer function and the oxygen storage function are integrated into one integrated part, so as to reduce the size of the adsorption tower 21, etc. The volume and weight of the constituted oxygen control device 20 . The tank tower includes a plurality of cavities that constitute the adsorption tower 21, the buffer tank 26 and the oxygen storage tank 27, and the bottom plate is covered on the tank tower to seal the multiple cavities, and the multiple cavities are formed into mutually isolated adsorption towers 21, Buffer tank 26 and oxygen storage tank 27.

In addition, the adsorption tower 21, the buffer tank 26 and the oxygen storage tank 27 can have the same height and are arranged side by side at the same level, which can ensure that the oxygen control device 20 is more compact, so as to realize the miniaturized design of the oxygen control device 20, and it is convenient for gas road distribution. 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 storage 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 air inlet and air outlet of the adsorption tower 21 are arranged at the top 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 of the buffer tank 26; The air inlet of the oxygen tank 27 is arranged at the bottom end of the oxygen storage tank 27 to facilitate the arrangement of pipelines and to reduce the volume of the oxygen control device 20 formed by the adsorption tower 21 and the like.

In this embodiment, the adsorption tower 21 , the buffer tank 26 and the oxygen storage tank 27 can form a concave structure, and the air pump housing 23 can be embedded in the concave structure to reduce the volume of the oxygen control device 20 formed by the adsorption tower 21 and the like. .

It can be understood that, as shown in FIG. 5 , in order to realize the flow of gas between the air pump 22, the oxygen control space 10, the adsorption tower 21 and other components, a gas can be provided between the air pump 22, the oxygen control space 10 and the adsorption tower 21. road. The air inlet of the air pump 22 is connected to the oxygen control space 10 through the fourth air passage 284 , the air outlet of the air pump 22 is connected to the air inlet passage of the first valve 251 through the fifth air passage 285 , and the air inlet of the first valve 251 The passage is connected to the air inlet of the adsorption tower 21 through the third air passage 283, the air outlet of the adsorption tower 21 is connected to the air outlet passage of the second valve 252 through the first air passage 281, and the air outlet passage of the second valve 252 passes through the second air passage. The road 282 is connected to the first buffer tank 26, the adjacent two buffer tanks 26 are connected through the sixth gas path 286, the last buffer tank 26 is connected to the oxygen control space 10 through the seventh gas path 287, and the oxygen discharge of the adsorption tower 21 The port is communicated with the air inlet of the oxygen storage tank 27 through the eighth air passage 288 , and the air outlet of the oxygen storage tank 27 is discharged through the ninth air passage 289 . Generally speaking, the above-mentioned first gas path 281 to ninth gas path 289 can be designed as independent gas pipes. However, due to the large number of gas paths, the arrangement of gas pipes is troublesome, and the adsorption tower 21, the gas pump 22, and the gas path are also troublesome. The oxygen control device 20 composed of the same composition is larger in size, so that at least part of the gas path can be placed in a gas path plate 280, so that the main gas path is designed as a gas path board 280, and multiple air pipes are not needed to connect to realize the gas path. It is neat and tidy, and the manufacturing process of the oxygen control device 20 can be simplified and the number of fixing parts used for fixing multiple trachea can be reduced, so that the assembly efficiency of the oxygen control device 20 can be improved and the manufacturing cost of the oxygen control device 20 can be reduced. Wherein, the trachea can be a soft rubber trachea or a hard trachea.

Exemplarily, as shown in FIG. 6 , in the present application, the third air passage 283 , the first air passage 281 and the second air passage 282 may be arranged in the air passage plate 280 . To this end, the air inlet and outlet of the adsorption tower 21 and the air inlet and outlet of the buffer tank 26 can be arranged towards the gas passage plate 280, so that the gas can be stored in the gas passage plate 280 and the second valve 252 through the gas passage plate 280 and the second valve 252. Flow between the adsorption tower 21 and the buffer tank 26 can reduce the length of the sixth gas path 286 . Wherein, the gas passage plate 280 can be arranged at the top of the adsorption tower 21 , the buffer tank 26 and the oxygen storage tank 27 . Optionally, the first valve 251 and the second valve 252 can be arranged between the gas path plate 280 and the gas pump 22 to improve the compactness of the oxygen control device 20 formed by the adsorption tower 21 and the like, so as to reduce the size of the oxygen control device 20. volume. In addition, the oxygen outlet 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 there is no need to set the eighth gas path 288 between the adsorption tower 21 and the air pump 22, so that 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 oxygen control device 20 may further include a control device. 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 the air inlet passage and the air outlet passage in the valve assembly 25 .

Further, the control device may include an oxygen detector. The oxygen detector can be used to detect the oxygen content of the oxygen control space 10 , and the control device controls the operation of the air pump 22 and the valve assembly 25 based on the oxygen content of the oxygen control space 10 . When the oxygen content of the oxygen control space 10 detected by the oxygen detector is higher than the first threshold, the air pump 22 and the valve assembly 25 can be controlled, and the air pump 22, the valve assembly 25 and the adsorption tower 21 can be used to jointly control the content of the oxygen control space 10. The oxygen content reduces the oxygen content of the oxygen control space 10 . When the oxygen content detected by the oxygen sensor is lower than the second threshold, the air pump 22 can be controlled to stop running, that is, the oxygen content of the oxygen control space 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 opening and closing detector, which is used to detect whether the oxygen control space 10 is opened, and the control device may control the operation of the air pump 22 and the valve assembly 25 based on the opening and closing of the oxygen control space 10 . When the opening and closing detector detects that the oxygen control space 10 is not opened, the air pump 22 and the valve assembly 25 can be controlled, and the oxygen content in the oxygen control space 10 can be controlled through the joint action of the air pump 22, the valve assembly 25 and the adsorption tower 21. The oxygen content of the space 10 is reduced. When the opening and closing detector detects that the oxygen control space 10 is opened, the air pump 22 and the valve assembly 25 can be controlled to stop working. Optionally, the opening and closing detector can be any one of a light sensor, an infrared sensor, and a magnetic control switch, so as to realize the opening and closing detection of the oxygen control space 10 .

In addition, the control device can also be set to reduce the oxygen content of the oxygen control space 10 through the air pump 22 , the first valve 251 , the second valve 252 and the adsorption tower 21 every day. 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 oxygen control space 10 from 9:00 to 12:00 and 14 to 16:00 every day, and stop at the rest of the time. For another example, start the cycle for 2 hours and stop for 4 hours every day. It should be noted that the above specific numerical values are only examples, and do not limit the present application.

FIG. 7 is a schematic structural diagram of an oxygen control device 20 according to another embodiment of the present application.

Referring to FIG. 7 , the oxygen control device 20 of this 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 connected to the oxygen control space 10 through the fourth air passage 284, the air outlet of the air pump 22 is connected to the air inlet passage of the valve assembly 25 through the fifth air passage 285, and the air inlet passage of the valve assembly 25 passes through the third air passage 285. The gas path 283 is connected to the air inlet of the adsorption tower 21, the air outlet of the adsorption tower 21 is connected to the air outlet passage of the valve assembly 25 through the first air passage 281, and the air outlet passage of the valve assembly 25 is connected to the first air passage through the second air passage 282. The buffer tank 261, two adjacent buffer tanks 26 are connected through the sixth gas path 286, the last buffer tank 26 is connected to the oxygen control space 10 through the seventh gas path 287, and the oxygen outlet of the adsorption tower 21 is connected through the eighth gas path 288 It is communicated with the air inlet of the oxygen storage tank 27 , and the air outlet of the oxygen storage tank 27 is discharged through the ninth air passage 289 . Wherein, the first air passage 281 to the ninth air passage 289 are all designed as air pipes that are independent of each other.

Among them, the adsorption tower 21, the buffer tank 26 and the oxygen storage tank 27 are all cylindrical, have the same height, and are arranged side by side at the same level. The valve assembly 25 is disposed at the bottom end of the buffer tank 26 . The air pump 22 is arranged on the 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 exhaust port 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 . The air outlet of the first buffer tank 261 is disposed at the top of the first buffer tank 261 . The air inlet and the air outlet of the second buffer tank 262 are both disposed at the top of the second buffer tank 262 . Both the air inlet and the air outlet of the oxygen storage tank 27 are arranged at the top of the oxygen storage tank 27 . And the air outlet of the air pump 22 is disposed toward the valve assembly 25 .

All in all, the oxygen control device 20 of the present application includes an adsorption tower 21 and at least two buffer tanks 26 that are connected in sequence. The buffer tank 26 comes out from the air outlet of the first buffer tank 26, and the residual gas realizes a buffer, and the residual air from the first buffer tank 26 enters the air inlet of the second buffer tank 26, and passes through the The two buffer tanks 26 come out from the air outlet of the second buffer tank 26 to achieve secondary buffering until they come out from the air outlet of the last buffer tank 26 to achieve at least two buffers, so that through at least two buffer tanks 26 The residual gas discharged from the air outlet of the adsorption tower 21 is buffered at least twice, and the buffered residual gas is supplied to the oxygen control space 10 by the last buffer tank 26, so that the flow rate of the residual gas is greatly reduced. Noise caused by too fast airflow.

The above are only the embodiments of the present application, and are not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied in other related technical fields, All are similarly included in the scope of patent protection of the present application.

Claims (13)

1. An oxygen control device for evacuating an oxygen control space, the oxygen control device comprising:

the adsorption tower comprises an air inlet, an air outlet and an oxygen outlet, and the air inlet of the adsorption tower is communicated with the oxygen control space;

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 air outlet of the adsorption tower, and the air outlet of the last buffer tank is communicated with the oxygen control space.

2. The oxygen control device of claim 1, wherein the outlet flow rate of the oxygen outlet is 0.1L/min to 0.5L/min, and the inlet flow rate of the air inlet of the air pump is 3L/min to 10L/min.

3. The oxygen control device of claim 1, wherein the oxygen control device comprises an air pump and a valve assembly; the air inlet of the air pump is communicated with the oxygen control space, the air outlet of the air pump is communicated with the air inlet of the adsorption tower through the air inlet channel of the valve, and the air outlet of the adsorption tower is communicated with the oxygen control space through the air outlet channel of the valve.

4. The oxygen control device of claim 3, further comprising an oxygen storage tank, wherein the oxygen outlet of the adsorption tower is communicated with the oxygen storage tank.

5. The oxygen control device of claim 4, 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 level.

6. The oxygen control device according to claim 5, wherein the adsorption tower, the buffer tank and the oxygen storage tank are formed by an integrated tank tower and a bottom plate, the tank tower comprises 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 which are isolated from each other.

7. The oxygen control device of claim 5, wherein; the gas inlet and the gas 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 oxygen control 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 gas path, a second gas path and a third gas path are formed on the gas path plate, the first gas path is communicated with the gas outlet of the adsorption tower and the gas outlet channel of the valve, and the second gas path is communicated with the gas outlet channel of the valve and the first buffer tank; and the third air path is communicated with the air inlet channel of the valve and the air inlet of the adsorption tower.

8. The oxygen control device of claim 5, 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 oxygen control device according to claim 8, wherein zeolite molecular sieve particles are arranged in the adsorption tower, and the size of the zeolite molecular sieve particles is 0.4 mm-0.8 mm; the air pump pressurizes the air to 30KPa-100 KPa.

10. The oxygen control device according to claim 3, further comprising a control apparatus connected to the valve,

the control equipment controls the opening of a valve air inlet channel, so that the air pump transmits the air in the oxygen control space to the adsorption tower in a pressurized manner, 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 to be closed, so that the air pump stops pressurizing and transmitting the air to the adsorption tower, and the adsorption tower releases the residual air and discharges the residual air to the oxygen control space through the air inlet of the adsorption tower and the air outlet channel of the valve.

11. The oxygen control device according to claim 10, wherein the control apparatus comprises an oxygen detector for detecting the oxygen content of the oxygen control space, the control apparatus controlling the operation of the air pump and the valve based on the oxygen content of the oxygen control space.

12. The oxygen control device according to claim 3, 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 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, or closing the first air outlet channel and opening the second air inlet channel.

13. A kitchen appliance comprising an oxygen control device according to any of claims 1-12 in communication with an oxygen control space within the kitchen appliance.

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