CN211685551U

CN211685551U - Breathing tube structure for underwater movement

Info

Publication number: CN211685551U
Application number: CN202020110931.8U
Authority: CN
Inventors: 薛志诚
Original assignee: QBAS Co Ltd
Current assignee: QBAS Co Ltd
Priority date: 2019-03-08
Filing date: 2020-01-17
Publication date: 2020-10-16
Anticipated expiration: 2030-01-17

Abstract

The utility model provides a respiratory tube structure for underwater motion, it contains a mouthpiece, a connecting portion, a first air flue and a second air flue. The mouthpiece is suitable for being occluded by a user, the connecting part is arranged below the mouthpiece and communicated with the mouthpiece, and the first air channel and the second air channel are respectively connected with the connecting part through a first valve plate and a second valve plate. When a user inhales, the first valve plate can controllably enable fresh air to flow into the connecting portion from the first air channel. When the user exhales, the second valve sheet can controllably discharge the exhaust gas exhaled by the user from the second air passage to the outside.

Description

Breathing tube structure for underwater movement

Technical Field

The present invention relates to a respiratory tube structure, and more particularly to a respiratory tube structure for underwater exercise.

Background

Generally, the breathing tubes (or called "breathing tubes") commercially available for underwater exercises such as snorkeling or diving are of a single-tube design, i.e., when performing underwater exercises, either fresh air on the water surface inhaled by the user or exhaust air exhaled from the body of the user, enters and exits through a single air passage of the single tube.

When a user is doing underwater activities, the muscles of the whole body are in motion and consume more oxygen than usual, so that the user must perform rapid and frequent ventilation in order to meet the demand of a large amount of oxygen. However, when the breathing tube with the single-tube design is used, the same air passage is used for the intake of fresh air and the exhaust of waste gas, so that the waste gas (i.e. carbon dioxide) spitted by the user is not completely exhausted outside the tube, and then the fresh air is inhaled, so that the inhaled fresh air is mixed with the waste gas remained in the tube, and the intake of the fresh air by the user is reduced. Thus, since the content of the inhaled fresh air cannot meet the oxygen consumption requirement of the exercise, in such an anoxic condition, the user is prone to have a dizziness condition or need to exchange air more frequently, which may result in the inability to perform a long-lasting floating or diving exercise or even affect the life safety.

Another prior art breathing structure, as disclosed in U.S. patent publication No. US2018/0001979A1, includes a central member and two inlet tubes symmetrically disposed on opposite sides of the central member. The user inhales fresh air through the two air inlet pipes, and the front and rear ends of the central piece are respectively provided with a discharge valve and a mouthpiece for the user to bite, so that the exhaust gas exhaled from the mouthpiece at the rear end of the user is only discharged into the water toward the discharge valve at the front end and does not enter into the two air inlet pipes, thereby avoiding the problem of exhaust gas residue (see https:// www.youtube.com/way.

The above prior art appears to overcome the problem of exhaust gas remaining in the inspiratory tube to mix with fresh air and be re-inhaled by the user. However, since the exhaust gas discharged from the discharge valve is directly discharged into water, the pressure of the exhaust gas exhaled by the user needs to be higher than the "water pressure", which causes the user to have to make the lung of the user more strenuous in spitting air, which is very likely to cause the problem of unsmooth ventilation and the risk of physical damage for general consumers who are not trained in professional underwater exercise or users with weak lung function. On the other hand, when the exhaust gas is directly discharged into the water, the discharge valve at the front end continuously generates a bubble flow, which also causes a visual obstruction to the user who is traveling.

In view of the above, it is an urgent need in the art to provide a respiratory tube structure to improve the above-mentioned drawbacks of demanding expectoration.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a respiratory tube structure, when floating and diving, because the first air passage and the second air passage of the respiratory tube structure are all higher than the water surface, the exhaust gas exhaled by the user can be exhausted without resisting the water pressure, and the exhaled exhaust gas does not exist the condition of mixing with the inhaled fresh air, so as to be safely worn by the general consumers.

To achieve the above objective, the respiratory siphon structure of the present invention comprises a mouthpiece, a connecting portion, a first air passage and a second air passage. The mouthpiece is suitable for being occluded by a user, the connecting part is arranged below the mouthpiece and communicated with the mouthpiece, and the first air channel and the second air channel are respectively connected with the connecting part through a first valve plate and a second valve plate. When a user inhales, the first valve plate can controllably enable fresh air to flow into the connecting portion from the first air channel. When the user exhales, the second valve sheet can controllably discharge the exhaust gas exhaled by the user from the second air passage to the outside.

Drawings

FIGS. 1A and 1B are schematic diagrams of an inhalation and an exhalation of a respiratory tube structure according to a first embodiment, respectively;

FIG. 1C is a schematic diagram of the first air passage having a first diameter and the second air passage having a second diameter according to the first embodiment;

FIGS. 2A and 2B are schematic diagrams of an inhalation and an exhalation respectively of a respiratory tube structure according to a second embodiment;

FIG. 2C is a schematic diagram of the second embodiment with the first port and the second port having the second port;

FIGS. 3A and 3B are an external view and a cross-sectional view of a respiratory tube structure according to a third embodiment;

FIG. 3C is a partial exploded view of the respiratory tube structure of a third embodiment;

FIGS. 3D and 3E are schematic diagrams of the inhalation and exhalation, respectively, of the respiratory tube structure according to the third embodiment;

FIGS. 4A and 4B are an external view and an exploded view of a respiratory tube structure according to a fourth embodiment, respectively;

FIGS. 4C and 4D are schematic diagrams of inspiration and expiration of a respiratory tube structure according to a fourth embodiment; and

FIG. 5 is a schematic diagram of a fourth embodiment of the first air passage having a first diameter and the second air passage having a second diameter.

Description of the reference numerals

100. 200, 300, 400 breathing tube structure

110. 210, 310, 410 mouthpiece

120. 220, 320, 420 connecting part

130. 230, 330, 430 first air passage

130a, 230a, 330a, 430a first port diameter

140. 240, 340, 440 second air passage

140a, 240a, 340a, 440a second caliber

150. 250, 350, 450 first valve plate

1501. 2501 first valve plate base

160. 260, 360, 460 second valve plate

1601. 2601 second valve seat

270. 370, 470 third valve plate

180. 280, 380, 480 first dry top surface

190. 290, 390, 490 second dry top

412 outer end cap

413 outer valve plate

416 first chamber

418 second chamber

4301 Main pipe

4401 drainage/exhaust pipe

B two-way valve plate base

C fixer

Detailed Description

In the following embodiments and drawings, elements not directly related to the present invention have been omitted and not shown; the dimensional relationships among the elements in the drawings are easy to understand and are not intended to limit the actual scale.

The breathing tube structure provided by the utility model comprises a mouthpiece, a connecting part, a first air passage and a second air passage. The mouthpiece is suitable for being occluded by a user, the connecting part is arranged below the mouthpiece and communicated with the mouthpiece, and the first air channel and the second air channel are respectively connected with the connecting part through a first valve plate and a second valve plate. When a user inhales, the first valve plate can controllably enable fresh air to flow into the connecting portion from the first air channel. When the user exhales, the second valve sheet can controllably discharge the exhaust gas exhaled by the user from the second air passage to the outside. Through the above basic principle, the breathing tube structure of the present invention has various implementation modes, which will be described one by one below.

Fig. 1A-1B illustrate a breathing tube structure 100 of a first embodiment, which includes a mouthpiece 110, a connecting portion 120, a first airway 130 and a second airway 140. Since the breathing tube has a first valve plate 150 and a second valve plate 160, the connection portion 120, the first air passage 130 and the second air passage 140 are partially shown in cross section for convenience of illustration.

In the first embodiment, the first air passage 130 extends upward from a first side of the connecting portion, and the second air passage 140 extends upward from a lower portion of the connecting portion, so that the second air passage 140 is located at another side opposite to the first side. As shown in fig. 1A or 1B, the first side is the right side of the connecting portion 120, and the other side is the left side of the connecting portion 120, i.e. the first air channel 130 extends upward from the right side of the connecting portion 120, and the second air channel 140 extends upward from the lower side of the connecting portion 120, so that the second air channel 140 is located at the left side of the connecting portion 120. On the contrary, the first side may be the "left side" of the connecting portion 120, and the other side is the "right side" of the connecting portion 120, which is easily understood by those skilled in the art and therefore will not be described in detail.

In addition, the first vane 150 in the first air passage 130 is supported on a first vane seat 1501, and the second vane 160 in the second air passage 140 is supported on a second vane seat 1601.

Next, fig. 1A and 1B respectively show the inhalation/exhalation operation mode of the respiratory tube structure 100. In the inhalation diagram shown in fig. 1A, when a user inhales, the first valve plate 150 disposed between the connecting portion 120 and the first air channel 130 is in an open state, and the second valve plate 160 disposed between the connecting portion 120 and the second air channel 140 is in a closed state, so that only fresh air is inhaled from the outside through the first air channel 130, the connecting portion 120, and the mouthpiece 110 in sequence, and the fresh air is prevented from leaking to the second air channel 140 due to the blockage of the second valve plate 160.

In the air discharge schematic diagram shown in fig. 1B, when a user discharges air, the first valve plate 150 changes from the open state to the closed state, and the second valve plate 160 changes from the closed state to the open state, so that the exhaled exhaust gas is discharged to the outside only through the mouthpiece 110, the connecting portion 120, and the second air duct 140 in sequence, and the exhaust gas cannot enter the first air duct 130 due to the blockage of the first valve plate 150.

It should be noted that, since the first air duct 130 and the second air duct 140 are both disposed to extend upward, the air inlet of the first air duct 130 and the air outlet of the second air duct 140 are both above the water surface during the floating and submerging period of the user. Compared with the prior art, the utility model discloses a respiratory tube is because of discharge waste gas from the surface of water, and need not bear the water pressure of surface of water completely, so user's lung when spitting, and waste gas can be spit out to the mode that can relax. Therefore, the utility model discloses a respiratory tube really solves the puzzlement that prior art's the atmospheric pressure of exhaling waste gas need be greater than water pressure.

As shown in fig. 1C, a first aperture 130a of the first air passage 130 is not smaller than a second aperture 140a of the second air passage 140. That is, the first caliber 130a may be greater than or equal to the second caliber 140 a.

Preferably, the first aperture 130a of the first air passage 130 is larger than the second aperture 140a of the second air passage 140, and different pressure differences can be caused by the air suction/discharge through the aperture difference between the first aperture 130a and the second aperture 140a, so as to more efficiently discharge the exhaust gas. This is because, compared to inhalation, exhalation generates a higher pressure on the breathing tube, and even if the second bore 140a has a smaller bore, the exhaust gas can be easily discharged, and the larger bore first airway 130 can strive for more fresh air to remain in the airway to reduce the effort for the next inhalation. In the preferred embodiment, the first aperture 130a has an area between 312mm²To 468mm²And the area of the second aperture 140a is between 50mm²To 450mm²In the meantime.

On the other hand, the top end of the first air duct 130 and the top end of the second air duct 140 may be respectively provided with a first drying top surface 180(dry top) and a second drying top surface 190. Therefore, when the user dives under the water, the first and second drying

top surfaces

180 and 190 close the top ends of the first and

second air ducts

130 and 140 due to buoyancy, thereby preventing water from entering the first and

second air ducts

130 and 140.

In addition, the second air passage 140 is combined with the lower portion of the connecting portion 120 and extends upward, if the first air passage 130 and the second air passage 140 are inadvertently filled with water during use, the water is left in the bent portion of the second air passage 140 under the connecting portion 120 due to gravity, and the water is difficult to flow back into the connecting portion 120 due to the second valve piece 160, so as to ensure the comfort of the user when breathing with the breathing tube structure of the present invention.

Fig. 2A-2B illustrate a second embodiment of a respiratory tube structure, showing inspiratory/expiratory modes of operation, respectively, wherein the local connection 220, the first airway 230, and the second airway 240 are also shown in cross-section for ease of illustration. The respiratory tube structure 200 has a first air passage 230 extending upward from a first side of the connecting portion 220, and a second air passage 240 extending upward from the other side opposite to the first side, and is connected to the connecting portion 220 by a first valve plate 250 and a second valve plate 260. Different from the arrangement of the first embodiment, the first air duct 230 and the second air duct 240 of the second embodiment are symmetrically disposed on two opposite sides of the connecting portion 220 and extend upward.

In addition, the first valve plate 250 in the first air passage 230 is supported on the first valve plate seat 2501, and the second valve plate 260 in the second air passage 240 is supported on the second valve plate seat 2601.

When inhaling as shown in fig. 2A, the first valve plate 250 controllably allows fresh air to flow from the first air duct 230 to the connecting portion 220, and then allows the user to inhale through the mouthpiece 210; at this time, the first valve plate 250 is in the open state, and the second valve plate 260 is in the closed state, so that the fresh air only flows through the first air duct 230 for the user to inhale. When the air is exhaled as shown in fig. 2B, the second valve plate 260 can controllably discharge the exhaust air exhaled by the user from the second air duct 240 through the mouthpiece 210 and the connecting portion 220 in sequence; at this time, the first valve plate 250 is in the closed state, and the second valve plate 260 is in the open state, so the discharged exhaust gas is only discharged from the second air duct 240 to the outside.

As can be seen from the above, the second embodiment has the same switching states of the first valve plate 250 and the second valve plate 260 as those of the first embodiment and belongs to a design of a one-way valve plate, that is, when one of the first valve plate 250 and the second valve plate 260 is opened, the other one is closed.

On the other hand, the top end of the first air duct 230 and the top end of the second air duct 240 may also be respectively provided with a first drying top surface 280 and a second drying top surface 290, and the operation principle and effect thereof are the same as those described in the first embodiment, and thus the description thereof is omitted.

Another difference from the first embodiment is that the second embodiment may be provided with a third valve plate 270 below the connection portion 220, which is a one-way drain valve that is opened only toward the outside of the breath. In this way, if water enters the first air passage 230 and the second air passage 240 inadvertently during use and the permeated water remains in the space below the connecting portion 220 due to gravity, the user can perform the step of forcibly draining the connecting portion 220 by opening the third valve 270 through strong air blowing at an appropriate time, so that the inside of the connecting portion 220 can be kept dry to achieve a comfortable breathing effect. It should be noted that the air pressure generated by the user to exhale is sufficient to activate the third valve plate 270, and the air pressure for exhaling the exhaust air does not normally activate the third valve plate 270.

Furthermore, referring to fig. 2C, a first aperture 230a of the first air passage 230 may also be equal to or larger than a second aperture 240a of the second air passage 240, so the specific effects of the first aperture 230a and the second aperture 240a can refer to the description of the first embodiment. However, designing the first aperture 230a larger than the second aperture 240a in the second embodiment improves the efficiency of removing the accumulated water due to the small aperture of the second air passage 240 forcing more air pressure directly toward the third valve plate 270.

Fig. 3A-3E illustrate a third embodiment of a breathing tube structure. Fig. 3A and 3B are schematic external views and sectional views of a breathing tube structure 300, in which a first air passage 330 and a second air passage 340 of the breathing tube structure 300 are disposed in a same tube 300a, and the tube 300a is combined with a side edge of a connecting portion 320 and extends upward. That is, the tube 300a of the third embodiment is a single tube having two air passages (the first air passage 330 and the second air passage 340).

Referring to the partial exploded view of fig. 3C, the first air duct 330 and the second air duct 340 are connected to the connecting portion 320 by the first valve plate 350 and the second valve plate 360, respectively, as in the first and second embodiments. However, unlike the first and second embodiments (i.e. one single-way valve seat corresponding to one valve plate), the third embodiment is provided with the first valve plate 350 and the second valve plate 360 through a two-way valve seat B fixed inside a single tube, so that air can be sucked and discharged from the single tube.

As shown in the schematic inhalation diagram of fig. 3D, since the first valve plate 350 can only open downwards and the second valve plate 360 is forced to close, the first valve plate 350 can controllably allow fresh air to flow into the connecting portion 320 from the first air duct 330, and then the fresh air is inhaled by the user through the mouthpiece 310. As shown in the schematic exhalation diagram of fig. 3E, since the second valve piece 360 can only open upwards and the first valve piece 350 is forced to close, the second valve piece 360 controllably enables the exhaust exhaled by the user to be exhausted from the second air duct 340 to the outside via the mouthpiece 310 and the connecting portion 320 in sequence.

As can be seen from the above, except for the difference between the first air duct 330 and the second air duct 340 disposed in the same tube 300a, the opening and closing states of the first valve plate 350 and the second valve plate 360 in the tube 300a are the same as those of the first embodiment, and both belong to a design of one-way valve plate. In other words, when one of the first valve plate 350 and the second valve plate 360 is opened, the other is closed.

Like the second embodiment, the third embodiment may also be provided with a third valve plate 370 below the connection portion 320 for forced drainage, and a one-way drain valve that is opened only toward the outside. The forced drainage mechanism of the third valve plate 370 and the effect thereof can be referred to the description of the second embodiment, and will not be described herein.

Furthermore, referring to fig. 3B, the first aperture 330a of the first air duct 330 may be equal to or larger than the second aperture 340a of the second air duct 340, so the specific effects of the first aperture 330a and the second aperture 340a can be referred to the description of the first embodiment. However, designing the first aperture 330a larger than the second aperture 340a in the third embodiment improves the efficiency of removing water by spitting air because the smaller aperture of the second air path 340 forces more air pressure directly toward the third valve plate 270.

Finally, through the design that the first air passage 330 and the second air passage 340 are disposed in the same tube 300a, the breathing tube structure of the third embodiment can be worn by the user with the current habit of use, so as to reduce the psychological pressure that may be encountered when replacing new equipment, and only use a single tube to help to reduce the manufacturing cost.

Fig. 4A-4D illustrate a fourth embodiment of a breathing tube configuration. As shown in fig. 4A and 4B, the first air channel 430 and the second air channel 440 of the breathing tube structure 400 are extended upward from the same side of the connecting portion 420, and the main tube 4301 of the first air channel 430 and the drain/exhaust tube 4401 of the second air channel 440 are fixed together by at least two fasteners C. In addition, the top end of the first air duct 430 is sleeved with a dry top surface 480, the top end of the second air duct 440 is sleeved with an outer end cap 412 and an outer valve plate 413, more precisely, the dry top surface 480 is disposed at the top end of the main pipe 4301, and the outer end cap 412 and the outer valve plate 413 are disposed at the top end of the drain/exhaust pipe 4201.

The difference between the first air passage 430 and the second air passage 440 is different from that of the third embodiment in that the second valve plate 460 of the fourth embodiment is disposed inside the connection portion 420 (also referred to as "housing body").

In detail, as shown in the cross-sectional view of the breathing tube structure of fig. 4C or 4D, the connection part 420 of the fourth embodiment is internally divided into a first chamber 416 located at the upper side and a second chamber 418 located at the lower side (corresponding to a "drainage chamber"). The first air channel 430 is connected to the first chamber 416 in the connecting portion 420 by a first valve plate 450, so that the first valve plate 450 can control the air communication or closing between the first air channel 430 and the first chamber 416. The second chamber 418 of the connecting portion 420 is in gas communication with the second air duct 440, and the gas communication or closing between the first chamber 416 and the second chamber 418 can be controlled by the second valve plate 460. In position, the second valve plate 460 is positioned above the second chamber 418, i.e., below the first chamber 416.

Specifically, the first chamber 416 and the second chamber 418 are partitioned by the second valve seat 4601. Therefore, the first vane 450 in the first air passage 430 is supported on the first vane seat 4501, and the "second vane 460 in the connecting portion 420" is supported on the second vane seat 4601.

With continued reference to fig. 4C and 4D, the inhalation/exhalation operation mode of the breathing tube structure 400 is shown, respectively. As shown in FIG. 4C, when the user inhales, the fresh air entering from the dry top 480 forces the first valve plate 450 to open, and the second valve plate 460 above the second chamber 418 closes tightly upwards due to the reduced pressure in the first chamber 416. Therefore, the sucked fresh air sequentially flows through the dry top 480 and the first air duct 430, and enters the first chamber 416 of the connecting portion 420 through the opened first valve plate 450, thereby being sucked from the mouthpiece 410 by the user. Since the second valve plate 460 is in a tightly closed state (referred to as "closed state" above), the fresh air sucked at this stage does not leak from the upper first chamber 416 to the lower second chamber 418.

As shown in FIG. 4D, when a user exhales, the increased pressure in the first chamber 416 of the connecting portion 420 forces the first valve plate 450 to close, and the second valve plate 460 in the second chamber 418 releases downward to open. Therefore, when the exhaust air exhaled by the user reaches the first chamber 416 of the connecting portion 420 through the mouthpiece 410, the exhaust air is blocked by the first valve plate 450 and does not enter the first air duct 430, and the exhaust air only enters the second chamber 418 located below from the opened second valve plate 460 and is then discharged to the outside through the second air duct 440.

Like the second and third embodiments, the fourth embodiment may also be provided with a third valve plate 470 below the connecting portion 420; more precisely, however, the third valve plate 470 of the fourth embodiment is disposed below the second chamber 418. If the external water passes through the first air passage 430 and the connection pipe 420 carelessly and remains in the first chamber 416 of the connection part 420 during the inhalation of the user, the second valve plate 460 can be opened while the user still exhales, so that the accumulated water remaining in the first chamber 416 flows downwards into the second chamber 418, thereby maintaining the dry state of the first chamber 416. Meanwhile, because the third valve plate 470 is the one-way drain valve that only can open towards the outside, so the third valve plate 470 is also opened in the lump, therefore falls to ponding in the second chamber 418 and can be discharged to the external world in preparation to the inside of second chamber 418 also can maintain the drying, so the user can comfortably use the utility model discloses a breathing pipe structure breathes. It should be noted that the pressure generated by the user's forced exhalation is sufficient to activate the third valve plate 470, and the pressure generated by the user's forced exhalation is not generally sufficient to activate the third valve plate 470.

Moreover, as shown in fig. 5, the first aperture 430a of the first air passage 430 may be equal to or larger than the second aperture 440a of the second air passage 440, so the area size and the achievable effect of the first aperture 430a and the second aperture 440a can refer to the description of the first embodiment, and further description thereof is omitted. However, designing the first aperture 230a larger than the second aperture 240a in the fourth embodiment improves the efficiency of removing water by spitting air because the smaller aperture of the second air passage 440 forces more air pressure directly toward the third valve plate 470.

Finally, those skilled in the art can replace the outer end cap 412 and the outer valve plate 413 sleeved on the top end of the second air duct 440 with a semi-dry top surface or a full-dry top surface according to other requirements. As shown in fig. 5, the outer end cap 412 and the outer valve plate 413 are replaced with dry top surfaces similar to the first air duct 430, so that a second dry top surface 490 is also provided at the top end of the second air duct 440, thereby maintaining the efficacy of drying the inside of the second air duct 440.

To sum up, the utility model discloses a respiratory tube structure sees through first air flue supply fresh air and lets the waste gas of user's exhalation be discharged by the second air flue, therefore the exhaust gas of exhalation also does not exist with the condition that inhaled fresh air mixes. On the other hand, when the user floats on the water surface, the air inlet of the first air passage and the air outlet of the second air passage are both positioned above the water surface, so that the exhaust gas exhaled by the user can be easily exhausted from the water surface without resisting the water pressure. Accordingly, the breathing tube structure of the present invention solves the problem of unsmooth ventilation of the conventional breathing tube and reduces the risk of physical damage, so that consumers who are not trained in professional can wear the breathing tube structure safely.

The above-mentioned embodiments are only intended to illustrate the embodiments of the present invention and to explain the technical features of the present invention, and are not intended to limit the scope of the present invention. Any modifications or equivalent arrangements which may be readily devised by those skilled in the art are intended to be included within the scope of the present invention as defined by the appended claims.

Claims

1. A breathing tube structure for use in an underwater motion, comprising:

a mouthpiece adapted for engagement by a user;

a connecting part arranged below the mouthpiece and communicated with the mouthpiece; and

a first air passage and a second air passage connected to the connecting portion by a first valve plate and a second valve plate, respectively;

when a user inhales, the first valve plate can controllably enable fresh air to flow into the connecting part from the first air channel; when the user exhales, the second valve plate can controllably discharge the exhaled waste gas from the second air passage to the outside through the connecting part.

2. The breathing tube structure of claim 1, wherein the first air passage extends upward from a first side of the connecting portion; the second air passage extends upward from the lower portion of the connecting portion, so that the second air passage is located at the other side opposite to the first side.

3. The breathing tube structure of claim 1, wherein the first airway extends upward from a first side of the connecting portion, and the second airway extends upward from another side opposite to the first side.

4. The breathing tube structure of claim 1, wherein the first airway and the second airway are disposed in the same tube.

5. The breathing tube structure of claim 1, wherein the first airway and the second airway both extend upward from the same side of the connecting portion.

6. The respiratory tube structure of claim 5, wherein the interior of the connecting portion is divided into a first chamber located at the upper side and a second chamber located at the lower side, the first chamber is communicated with a mouthpiece and is connected with the first air passage, and the second chamber is communicated with the second air passage.

7. The breathing tube structure of claim 6, wherein the second valve is located above the second chamber, and the second valve can control the gas communication or the gas communication between the first chamber and the second chamber.

8. The breathing tube structure of claim 1, wherein the first airway has a first caliber that is not smaller than a second caliber of the second airway.

9. The respiratory tube structure of claim 2, 3 or 5, wherein the top end of the first airway and the top end of the second airway are further provided with a first dry top surface and a second dry top surface, respectively.

10. The breathing tube structure as claimed in claim 5, wherein the top end of the first air passage further has a dry top surface, and the top end of the second air passage further has an outer end cap and an outer valve plate.

11. The breathing tube structure of claim 3, 4 or 5, further comprising a third valve plate disposed below the connecting portion for draining accumulated water in the breathing tube.