Balancing device of oxygen generator

Abstract

The utility model relates to the technical field of oxygen generators, in particular to a balancing device of an oxygen generator. The first oxygen outlet channel is communicated with an oxygen outlet of the first molecular sieve, the second oxygen outlet channel is communicated with an oxygen outlet of the second molecular sieve, and the first end part of the first oxygen outlet channel and the first end part of the second oxygen outlet channel are communicated into the oxygen storage cavity; the balancing device comprises a flow limiting balancing pipe, and the second end of the first oxygen outlet channel and the second end of the second oxygen outlet channel are communicated with the two ends of the flow limiting balancing pipe. Oxygen is input into the second oxygen outlet channel, so that the second oxygen outlet channel is recovered to a high-pressure or relatively high-pressure environment, and the nitrogen removal efficiency of the second molecular sieve is promoted; and under the action of the flow-limiting balance pipe, the flow of oxygen can be controlled, and the pressure in the channel can be balanced.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen generators, and particularly relates to a balance device for an oxygen generator. Background Art

[0002] In an oxygen generator, generally, oxygen is separated by molecular sieves to produce oxygen. However, when oxygen is separated, nitrogen is simultaneously generated, and the nitrogen needs to be discharged before the next step of pressurized oxygen separation can be carried out.

[0003] However, during the process of discharging nitrogen, the internal air pressure of the molecular sieve will gradually decrease as nitrogen is discharged, thus affecting the nitrogen discharge speed. Therefore, how to ensure efficient nitrogen discharge and ensure the oxygen content is one of the key research issues for those skilled in the art. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a balance device for an oxygen generator to solve the problem that nitrogen cannot be efficiently discharged, aiming at the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the utility model to solve its technical problem is: to provide a balance device for an oxygen generator, the oxygen generator includes a first molecular sieve, a second molecular sieve, a first oxygen outlet channel, a second oxygen outlet channel and an oxygen storage chamber. The first oxygen outlet channel is communicated with the oxygen outlet of the first molecular sieve, the second oxygen outlet channel is communicated with the oxygen outlet of the second molecular sieve, and the first end of the first oxygen outlet channel and the first end of the second oxygen outlet channel are communicated into the oxygen storage chamber;

[0006] The balance device includes a flow-limiting balance pipe, and the second ends of the first oxygen outlet channel and the second oxygen outlet channel are communicated with both ends of the flow-limiting balance pipe.

[0007] Among them, a preferred solution is: the cross-sectional area of the flow-limiting balance pipe is smaller than the cross-sectional area of the second end of the first oxygen outlet channel, and the cross-sectional area of the flow-limiting balance pipe is smaller than the cross-sectional area of the second end of the second oxygen outlet channel.

[0008] Among them, a preferred solution is: the oxygen generator includes an upper shell and a lower shell, and the upper shell and the lower shell are closed to form the first oxygen outlet channel and the second oxygen outlet channel.

[0009] Among them, a preferred solution is: the oxygen outlets of the first molecular sieve and the second molecular sieve are convex structures; the lower shell includes two first grooves respectively sleeved and connected with the two oxygen outlets, the upper shell includes two second grooves sleeved and connected with the two first grooves, the first grooves are communicated with the corresponding second grooves, and the two second grooves are respectively communicated with the first oxygen outlet channel and the second oxygen outlet channel.

[0010] Among them, the preferred solution is that the first groove and the second groove are positioned as oxygen inlets, and the two oxygen inlets are respectively arranged in the middle regions of the first oxygen outlet channel and the second oxygen outlet channel. The first oxygen outlet channel is divided into a front first oxygen outlet channel and a rear first oxygen outlet channel through the oxygen inlet, and the second oxygen outlet channel is divided into a front second oxygen outlet channel and a rear second oxygen outlet channel through the oxygen inlet. Among them,

[0011] The flow-limiting balance pipe is respectively communicated with the end of the rear first oxygen outlet channel and the end of the rear second oxygen outlet channel;

[0012] The oxygen storage cavity is respectively communicated with the end of the front first oxygen outlet channel and the end of the front second oxygen outlet channel;

[0013] The second groove is sleeved on the first groove, and an air vent gap is arranged between the two, and the air vent gap is respectively communicated with the first oxygen outlet channel and the second oxygen outlet channel.

[0014] Among them, the preferred solution is that both of the two second grooves are provided with oxygen diffusion cavities. One oxygen diffusion cavity is respectively communicated with the air vent gap and the end of the front first oxygen outlet channel, and the other oxygen diffusion cavity is respectively communicated with the air vent gap and the end of the front second oxygen outlet channel;

[0015] Among them, the oxygen diffusion cavity includes an inclined surface arranged on the upper shell and communicated with the second groove, the side surface of the first groove of the lower shell, and the bottom surface of the lower shell.

[0016] Among them, the preferred solution is that the upper shell is provided with a first ventilation hole communicated with the rear first oxygen outlet channel and a second ventilation hole communicated with the rear second oxygen outlet channel. The balance device includes a cover body, and the cover body includes a first air passage, a second air passage and a third air passage. The flow-limiting balance pipe is fixedly arranged in the second air passage, and the first ventilation hole, the first air passage, the central through hole of the flow-limiting balance pipe, the third air passage and the second ventilation hole are sequentially communicated.

[0017] Among them, the preferred solution is that the flow-limiting balance pipe further includes a fixing bracket. The fixing bracket includes a base having a first opening and a second opening, and a supporting hollow column arranged in the middle of the base. The flow-limiting balance pipe is arranged in the supporting hollow column, and the first opening and the second opening are respectively arranged at the two ends of the supporting hollow column;

[0018] Among them, the first opening is arranged around the outside of the first ventilation hole, the second opening is arranged around the outside of the second ventilation hole, the cover body covers above the fixing bracket, and the first ventilation hole, the first opening and the first air passage are sequentially communicated, the second ventilation hole, the second opening and the second air passage are sequentially communicated, and the supporting hollow column is arranged in the second air passage.

[0019] Among them, a preferred solution is that the upper shell includes an oxygen outlet interface communicated with the oxygen storage cavity. The oxygen outlet interface includes a first ventilation port and a second ventilation port. The first ventilation port is communicated with the front first oxygen outlet channel, and the second ventilation port is communicated with the front second oxygen outlet channel;

[0020] Among them, the oxygen outlet interface is arranged close to one side. After the front second oxygen outlet channel is connected to the ventilation gap, it is bent and then connected to the second ventilation port.

[0021] The beneficial effect of the present utility model is that, compared with the prior art, the oxygen output from the oxygen outlet of the first molecular sieve flows into the first oxygen outlet channel. On the one hand, it flows into the oxygen storage cavity for the patient to inhale. On the other hand, it flows into the second oxygen outlet channel through the flow-limiting balance tube. Due to the small holes of the flow-limiting balance tube, only a small part of the oxygen will flow into the second oxygen outlet channel. At this time, the compressor no longer outputs gas to the second molecular sieve, and the oxygen in the second molecular sieve has already entered the oxygen storage cavity, and the nitrogen inside the oxygen storage cavity is also in the process of excretion. By inputting oxygen into the second oxygen outlet channel, the second oxygen outlet channel is restored to a high-pressure or relatively high-pressure environment, which promotes the nitrogen excretion efficiency of the second molecular sieve; through the action of the flow-limiting balance tube, it helps to control the oxygen flow rate and balance the pressure in the channel. Description of the Drawings

[0022] The following will further illustrate the present utility model in conjunction with the drawings. In the drawings:

[0023] Figure 1 is a schematic structural diagram of the oxygen generator of the present utility model;

[0024] Figure 2 is a schematic structural diagram of the balance device of the oxygen generator of the present utility model;

[0025] Figure 3 is a schematic structural diagram of the molecular sieve of the present utility model;

[0026] Figure 4 is a front structural diagram of the balance device of the present utility model;

[0027] Figure 5 is a back structural diagram of the balance device of the present utility model;

[0028] Figure 6 is a front exploded structural diagram of the balance device of the present utility model;

[0029] Figure 7 is a back exploded structural diagram of the balance device of the present utility model;

[0030] Figure 8 is a back structural diagram of the upper shell of the present utility model;

[0031] Figure 9 is a schematic cross-sectional structure diagram of the upper shell and the lower shell of the present utility model;

[0032] Figure 10 is a schematic cross-sectional structure diagram of the balance device of the present utility model;

[0033] Figure 11 is a schematic structure diagram of the fixing bracket of the present utility model;

[0034] Figure 12 is a schematic structure diagram of the current-limiting balance pipe of the present utility model. Specific embodiments

[0035] Now, in conjunction with the accompanying drawings, detailed descriptions of the preferred embodiments of the present utility model will be given.

[0036] As Figures 1 to 12 shown, the present utility model provides a preferred embodiment of the balance device 300 of an oxygen generator.

[0037] A balance device 300 of an oxygen generator, the oxygen generator includes a first molecular sieve 110, a second molecular sieve 120, a first oxygen outlet channel 210, a second oxygen outlet channel 220 and an oxygen storage chamber 400. The first oxygen outlet channel 210 is communicated with the oxygen outlet 111 of the first molecular sieve 110, the second oxygen outlet channel 220 is communicated with the oxygen outlet 121 of the second molecular sieve 120, and the first end 211 of the first oxygen outlet channel 210 and the first end 221 of the second oxygen outlet channel 220 are communicated into the oxygen storage chamber 400. The balance device 300 includes a current-limiting balance pipe 310, and the second end 212 of the first oxygen outlet channel 210 and the second end 222 of the second oxygen outlet channel 220 are communicated with both ends of the current-limiting balance pipe 310.

[0038] A first molecular sieve 110 and a second molecular sieve 120 are provided. Both the first molecular sieve 110 and the second molecular sieve 120 further include an air inlet and an oxygen outlet. The first molecular sieve 110 is provided with a first oxygen outlet 111, and the second molecular sieve 120 is provided with a second oxygen outlet 121. The air inlet is communicated with a compressor and a nitrogen outlet through a control valve. The working process is that, under the control of the control valve, the compressor inputs gas to the first molecular sieve 110. The first molecular sieve 110 precipitates oxygen and nitrogen due to high pressure. The nitrogen is discharged from the nitrogen outlet through the air inlet and the control valve, and the oxygen is output from the oxygen outlet. At this time (when the first molecular sieve 110 precipitates oxygen and nitrogen), the compressor disconnects the gas supply to the first molecular sieve 110 under the control of the control valve and conveys the gas to the second molecular sieve 120. The second molecular sieve 120 precipitates oxygen and nitrogen due to high pressure. Therefore, the first molecular sieve 110 and the second molecular sieve 120 cooperate with the compressor to alternately output oxygen through their respective oxygen outlets, achieving seamless oxygen output and realizing stable and continuous oxygen supply. Since the structural schemes of the control valve, the compressor, the first molecular sieve, and the second molecular sieve are conventional designs and not the core scheme of the present utility model, for the explanation of the working principle, the core scheme lies in the design of the flow-limiting balance pipe 310.

[0039] Among them, when the compressor inputs gas to the molecular sieve, the microporous structure of the molecular sieve will selectively adsorb the molecules in the gas. Due to the different sizes and properties of oxygen and nitrogen molecules, different degrees of adsorption occur in the molecular sieve. The pore size of the molecular sieve makes it more inclined to adsorb oxygen molecules and less inclined to adsorb nitrogen molecules. Therefore, when the gas passes through the molecular sieve, relatively fewer nitrogen molecules are adsorbed, and more oxygen molecules are adsorbed. Due to the adsorption effect, oxygen molecules will be enriched in the molecular sieve, forming the precipitation of oxygen. At the same time, the relatively less adsorbed nitrogen molecules are relatively easier to pass through the molecular sieve and finally discharge from the nitrogen outlet, realizing the separation and purification process of nitrogen and oxygen.

[0040] The oxygen output from the oxygen outlet 111 of the first molecular sieve 110 flows into the first oxygen outlet channel 210. On the one hand, it flows into the oxygen storage cavity 400 for the patient to inhale. On the other hand, it flows into the second oxygen outlet channel 220 through the flow-limiting balance pipe 310. Due to the small hole effect of the flow-limiting balance pipe 310, only a small part of the oxygen will flow into the second oxygen outlet channel 220. At this time, the compressor no longer outputs gas to the second molecular sieve 120, and the oxygen in the second molecular sieve 120 has already entered the oxygen storage cavity 400, and the nitrogen inside the oxygen storage cavity 400 is also in the process of excretion. By inputting oxygen into the second oxygen outlet channel 220, the second oxygen outlet channel 220 is restored to a high-pressure or relatively high-pressure environment, promoting the nitrogen discharge efficiency of the second molecular sieve 120. Through the action of the flow-limiting balance pipe 310, it helps to control the oxygen flow rate and balance the pressure in the channel.

[0041] In this embodiment, the cross-sectional area of the flow-limiting balance tube 310 is smaller than the cross-sectional area of the second end 212 of the first oxygen outlet channel 210, and the cross-sectional area of the flow-limiting balance tube 310 is smaller than the cross-sectional area of the second end 222 of the second oxygen outlet channel 220. By restricting the cross-sectional area of the flow-limiting balance tube 310, it can be ensured that only a small amount of oxygen enters the first oxygen outlet channel 210 or the second oxygen outlet channel 220, achieving precise control of the oxygen flow rate, so that the oxygen passing through the flow-limiting balance tube 310 does not affect the amount of oxygen entering the oxygen storage chamber 400. In particular, the oxygen entering the first oxygen outlet channel 210 or the second oxygen outlet channel 220 is mainly due to the decrease in air pressure caused by nitrogen discharge inside the first oxygen outlet channel 210 or the second oxygen outlet channel 220, reducing the nitrogen discharge efficiency. Therefore, some oxygen is adsorbed and enters through the flow-limiting balance tube 310 to increase the air pressure near the oxygen outlet of the molecular sieve, thereby improving the nitrogen discharge efficiency.

[0042] Furthermore, by restricting the cross-sectional area of the flow-limiting balance tube 310, the flow rate of oxygen entering the first oxygen outlet channel 210 and the second oxygen outlet channel 220 can be controlled. The relatively small cross-sectional area of the flow-limiting balance tube 310 can maintain the pressure balance within the system while preventing the oxygen flow rate from being too fast or too slow, ensuring the stable operation of the system; and by restricting the amount of oxygen entering the first oxygen outlet channel 210 and the second oxygen outlet channel 220, the purity and quality of the oxygen can be ensured, preventing excessive nitrogen or other impurities from entering the oxygen supply system and avoiding a decrease in the amount of oxygen.

[0043] As Figures 6 to 12 shown, the present utility model provides a preferred embodiment of the upper shell 12 and the lower shell 11.

[0044] The oxygen generator includes an upper shell 12 and a lower shell 11, and the upper shell 12 and the lower shell 11 are joined together to form a first oxygen outlet channel 210 and a second oxygen outlet channel 220. Through the arrangement of the upper shell 12 and the lower shell 11, the cost and complexity of mold manufacturing are reduced, the processing procedures are reduced, and the manufacturing cost is lowered. The combination of the upper shell 12 and the lower shell 11 to form the channels reduces the setting of some additional connecting parts, pipes or fittings, simplifying the overall structure.

[0045] In this embodiment, the oxygen outlets of the first molecular sieve 110 and the second molecular sieve 120 are convex structures; the lower shell 11 includes two first grooves (2102, 2202) respectively sleeved and connected with the two oxygen outlets, and the upper shell 12 includes two second grooves (2103, 2203) sleeved and connected with the two first grooves (2102, 2202). The first grooves (2102, 2202) communicate with the corresponding second grooves (2103, 2203), and the two second grooves (2103, 2203) communicate with the first oxygen outlet channel 210 and the second oxygen outlet channel 220 respectively.

[0046] The convex structure is provided with an annular groove, and a rubber ring is arranged in the annular groove. The first grooves (2102, 2202) are sleeved into the convex structure, and the convex structure is attached to the inner side walls of the first grooves (2102, 2202) through the annular groove to form a sealed setting. The second grooves (2103, 2203) are a structure in the upper shell 12, which is connected to the first grooves (2102, 2202) in the lower shell 11 and communicates with the first oxygen outlet channel 210 and the second oxygen outlet channel 220. The function of the second grooves (2103, 2203) is to provide a channel for oxygen to flow to the first oxygen outlet channel 210 and the second oxygen outlet channel 220. Its design enables oxygen to smoothly pass through the convex structure from the oxygen outlet of the molecular sieve and enter the corresponding oxygen outlet channels through the first grooves (2102, 2202) and the second grooves (2103, 2203).

[0047] Through the design of the second grooves (2103, 2203), the flow path of oxygen inside the oxygen generator is planned and controlled to ensure that oxygen flows to the correct outlet channels, thereby achieving precise oxygen supply. The setting of the second grooves (2103, 2203) helps to optimize the flow path of oxygen and ensure the stable operation and high efficiency of the system.

[0048] In this embodiment, the first grooves (2102, 2202) and the second grooves (2103, 2203) are positioned as oxygen inlets. The two oxygen inlets are respectively arranged in the middle regions of the first oxygen outlet channel 210 and the second oxygen outlet channel 220. The first oxygen outlet channel 210 is divided into a front first oxygen outlet channel and a rear first oxygen outlet channel through the oxygen inlet, and the second oxygen outlet channel 220 is divided into a front second oxygen outlet channel and a rear second oxygen outlet channel through the oxygen inlet; wherein, the flow-limiting balance pipe 310 is respectively communicated with the ends of the rear first oxygen outlet channel and the rear second oxygen outlet channel; the oxygen storage cavity 400 is respectively communicated with the ends of the front first oxygen outlet channel and the front second oxygen outlet channel; the second grooves (2103, 2203) are sleeved on the first grooves (2102, 2202), and an air ventilation gap 1203 is arranged between the two, and the air ventilation gap 1203 is respectively communicated with the first oxygen outlet channel 210 and the second oxygen outlet channel 220.

[0049] In this embodiment, both of the two second grooves (2103, 2203) are provided with oxygen expansion cavities 1202. The oxygen expansion cavities 1202 are respectively communicated with the air ventilation gap 1203 and the ends of the front first oxygen outlet channel, and the other oxygen expansion cavity 1202 is respectively communicated with the air ventilation gap 1203 and the ends of the front second oxygen outlet channel; wherein, the oxygen expansion cavity 1202 includes an inclined surface 1201 arranged on the upper shell 12 and communicated with the second grooves (2103, 2203), the side surfaces of the first grooves (2102, 2202) of the lower shell 11, and the bottom surface of the lower shell 11.

[0050] As Figures 9 to 12 shown, the present utility model provides a preferred embodiment of the balancing device 300.

[0051] The upper shell 12 is provided with a first ventilation hole 2121 communicating with the first oxygen outlet channel at the rear, and a second ventilation hole 2221 communicating with the second oxygen outlet channel at the rear. The balancing device 300 includes a cover body 320. The cover body 320 includes a first air passage 321, a second air passage 323 and a third air passage 322. The flow-limiting balancing pipe 310 is fixedly arranged in the second air passage 323. The first ventilation hole 2121, the first air passage 321, the central through hole 311 of the flow-limiting balancing pipe 310, the third air passage 322 and the second ventilation hole 2221 are communicated in sequence.

[0052] The cross-sectional area of the central through hole 311 is smaller than the cross-sectional areas of the first air passage 321 and the third air passage 322, so as to reduce the flow rate of the air flow passing through the central through hole 311, thereby realizing flow limiting, ensuring that most of the oxygen enters the oxygen storage cavity 400 and flows out from the oxygen outlet pipe 410.

[0053] In this embodiment, the flow-limiting balancing pipe 310 further includes a fixing bracket 330. The fixing bracket 330 includes a base 331 having a first opening 3311 and a second opening 3312, and a supporting hollow column 3313 arranged in the middle of the base 331. The flow-limiting balancing pipe 310 is arranged in the supporting hollow column 3313, and the first opening 3311 and the second opening 3312 are respectively arranged at the two ends of the supporting hollow column 3313; wherein, the first opening 3311 is arranged around the outside of the first ventilation hole 2121, the second opening 3312 is arranged around the outside of the second ventilation hole 2221, the cover body 320 covers above the fixing bracket 330, and the first ventilation hole 2121, the first opening 3311 and the first air passage 321 are communicated in sequence, the second ventilation hole 2221, the second opening 3312 and the second air passage 323 are communicated in sequence, and the supporting hollow column 3313 is arranged in the second air passage 323.

[0054] Through the arrangement of the base 331, the supporting installation of the flow-limiting balancing pipe 310 is realized, and through the cooperative arrangement of the first opening 3311 and the second opening 3312, a sealed channel is formed, so that a more sealed flow channel exists between the upper shell 12 and the cover body 320.

[0055] As Figure 1 shown, the present utility model provides a preferred embodiment of the oxygen outlet interface 230.

[0056] The upper shell 12 includes an oxygen outlet interface 230 communicating with the oxygen storage cavity 400. The oxygen outlet interface 230 includes a first ventilation port 231 and a second ventilation port 232. The first ventilation port 231 communicates with the front first oxygen outlet channel, and the second ventilation port 232 communicates with the front second oxygen outlet channel. Among them, the oxygen outlet interface 230 is disposed near one side. After connecting to the ventilation gap 1203, the front second oxygen outlet channel is bent and then connected to the second ventilation port 232.

[0057] Oxygen at two places is obtained through the oxygen outlet interface 230 and converges into the oxygen storage cavity 400 to achieve an orderly and sealed connection between each module.

[0058] The above are only the best embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes or modifications made according to the scope of the patent application of the present invention shall be covered by the present invention.

Claims

1. A balancing device for an oxygen generator, characterized in that: The oxygen generator comprises a first molecular sieve, a second molecular sieve, a first oxygen outlet channel, a second oxygen outlet channel and an oxygen storage chamber, wherein the first oxygen outlet channel is connected to the oxygen outlet of the first molecular sieve, the second oxygen outlet channel is connected to the oxygen outlet of the second molecular sieve, and the first end of the first oxygen outlet channel and the first end of the second oxygen outlet channel are connected to the oxygen storage chamber; The balancing device comprises a flow-limiting balancing tube, and the second end of the first oxygen outlet channel and the second end of the second oxygen outlet channel are in communication with two ends of the flow-limiting balancing tube.

2. The balancing device according to claim 1, characterized in that: The cross-sectional area of ​​the flow-limiting balance tube is smaller than the cross-sectional area of ​​the second end of the first oxygen outlet channel, and the cross-sectional area of ​​the flow-limiting balance tube is smaller than the cross-sectional area of ​​the second end of the second oxygen outlet channel.

3. The balancing device according to claim 1 or 2, characterized in that: The oxygen generator comprises an upper shell and a lower shell, and the upper shell and the lower shell are closed to form a first oxygen outlet channel and a second oxygen outlet channel.

4. The balancing device according to claim 3, characterized in that: The oxygen outlets of the first molecular sieve and the second molecular sieve are convex structures; the lower shell includes two first grooves respectively connected to the two oxygen outlets, and the upper shell includes two second grooves connected to the two first grooves, the first groove is connected to the corresponding second groove, and the two second grooves are respectively connected to the first oxygen outlet channel and the second oxygen outlet channel.

5. The balancing device according to claim 4, characterized in that: The first groove and the second groove are positioned as oxygen inlets, and the two oxygen inlets are respectively arranged in the middle area of ​​the first oxygen outlet channel and the second oxygen outlet channel, the first oxygen outlet channel is divided into a front first oxygen outlet channel and a rear first oxygen outlet channel by the oxygen inlet, and the second oxygen outlet channel is divided into a front second oxygen outlet channel and a rear second oxygen outlet channel by the oxygen inlet; wherein, The current limiting balance pipe is connected to the end of the first rear oxygen outlet channel and the end of the second rear oxygen outlet channel respectively; The oxygen storage chamber is communicated with the end of the front first oxygen outlet channel and the end of the front second oxygen outlet channel respectively; The second groove is sleeved with the first groove, and a ventilation gap is arranged between the two, and the ventilation gap is communicated with the first oxygen outlet channel and the second oxygen outlet channel respectively.

6. The balancing device according to claim 5, characterized in that: The two second grooves are each provided with an oxygen expansion cavity, the oxygen expansion cavity is respectively connected to the ventilation gap and the end of the front first oxygen outlet channel, and the other oxygen expansion cavity is respectively connected to the ventilation gap and the end of the front second oxygen outlet channel; Wherein, the oxygen expansion cavity includes an inclined surface arranged on the upper shell and connected to the second groove, a side surface of the first groove of the lower shell, and a bottom surface of the lower shell.

7. The balancing device according to claim 5, characterized in that: The upper shell is provided with a first vent hole connected to the rear first oxygen outlet channel, and a second vent hole connected to the rear second oxygen outlet channel. The balancing device includes a cover body, and the cover body includes a first airway, a second airway and a third airway. The flow-limiting balancing tube is fixed in the second airway, and the first vent hole, the first airway, the central through hole of the flow-limiting balancing tube, the third airway and the second vent hole are connected in sequence.

8. The balancing device according to claim 7, characterized in that: The current limiting balance pipe also includes a fixed bracket, the fixed bracket includes a base having a first opening and a second opening, and a supporting hollow column arranged in the middle of the base, the current limiting balance pipe is arranged in the supporting hollow column, and the first opening and the second opening are respectively arranged at the openings at both ends of the supporting hollow column; Among them, the first opening is arranged around the outer side of the first air vent, the second opening is arranged around the outer side of the second air vent, the cover body covers the top of the fixed bracket, and the first air vent, the first opening and the first air duct are connected in sequence, the second air vent, the second opening and the second air duct are connected in sequence, and the supporting hollow column is arranged in the second air duct.

9. The balancing device according to claim 5, characterized in that: The upper shell includes an oxygen outlet interface connected to the oxygen storage cavity, and the oxygen outlet interface includes a first vent and a second vent, the first vent is connected to the front first oxygen outlet channel, and the second vent is connected to the front second oxygen outlet channel; Wherein, the oxygen outlet interface is arranged close to one side, and the front second oxygen outlet channel is connected to the ventilation gap and then bent to connect to the second ventilation port.

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