CN112704825A

CN112704825A - Oral method for separately treating expiration and inspiration and breathing sub-channel

Info

Publication number: CN112704825A
Application number: CN202011615862.7A
Authority: CN
Inventors: 李明忠
Original assignee: Shanghai Ruizheng Environmental Protection Technology Development Co ltd
Current assignee: Shanghai Ruizheng Environmental Protection Technology Development Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-04-27
Also published as: WO2022143600A1

Abstract

An oral method and respiratory sub-channel for treating exhalation and inhalation separately. The invention belongs to the technical field of masks, and discloses a method for disposing of exhalation and inhalation separately. When the human respiratory system exhales, the exhaled gas is discharged through the exhalation channel; when the human respiratory system inhales, the gas is inhaled through the inhalation channel. The invention eliminates that the exhaled carbon dioxide stays in the space between the mask body and the face. Due to the rapid discharge of exhalation, the air pressure in the room between the face and the mask body is low, and the air outside the mask body when inhaling After being filtered, it can enter quickly, ensuring that there is enough air when inhaling, and you will not feel that the inhaled air is insufficient, which provides an effective guarantee for the safety and health of the human body.

Description

Oral method for separately treating expiration and inspiration and breathing sub-channel

Technical Field

The invention belongs to the technical field of masks, and particularly relates to a method for separately treating expiration and inspiration, namely a breathing sub-channel.

Background

The sudden attack of new crown epidemic brings huge disasters to the whole mankind. The mask body becomes the main equipment for defending new crown epidemic situation. However, the existing mask body only considers the treatment of the inhaled air, and the pollutants in the inhaled air are filtered by the high-efficiency filter cloth to remove the pollutants in the inhaled air, and how the exhaled foul air can be quickly exhausted to the atmosphere when the human body breathes is not considered.

To solve the breathing problem when people wear the mask body, the related characteristics of the breathing system in the human engineering are firstly known. The main characteristics are as follows:

firstly, human breath can be divided into expiration and inspiration, and the expiration function is to discharge foul smell (mainly carbon dioxide) in the body; the function of the body to inhale is to extract oxygen from the inhaled gas and to supply the oxygen to the major organs in the body through the blood flow.

Secondly, the exhalation and the inhalation of the human body are continuously and alternately carried out, about 22 breaths per minute, and the breath volume of each time is about 500 ml.

Thirdly, the temperature of the air exhaled by the human body is about 28-30 ℃, the relative humidity is about 85%, the temperature of the air inhaled by the human body is about-20-35 ℃ and the relative humidity is about 20-50% along with the environment. The pressure (positive pressure) of the human body during expiration is about 30 pa-50 pa; the pressure (negative pressure) during inhalation is about-30 pa to-50 pa.

Fourthly, the respiratory system of the human body mainly comprises the following organs: nose, pharynx, larynx, bronchus, trachea, lung, nose is the main channel of respiratory system to the external world.

And the change range of the human breath is large, and the change range of the human breath is different with different ages, different with different physical exercise amounts and different with different health conditions of human bodies.

And the influence of climate on the human breath is also great, and particularly when the mask body is worn, the ambient temperature is high, the temperature rise at the breathing outlet can be increased, and the exhalation is difficult. Too low an ambient temperature can cause the breath to form condensation at the outlet, which is also very uncomfortable.

When the human body breathes, expiration and inspiration are continuously and alternately carried out, because the air pressure in the human body is the same as the air pressure in the atmosphere, when the human body breathes out, the breathing organs generate the pressure of lodging to discharge the foul air of the human body from nostrils, when the human body breathes in, the breathing organs generate the expansion force to lead the air inhaled from the nasal cavities to the lungs, and the respiratory system of the human body withdraws enough oxygen from the inhaled air and supplies the oxygen to important organs in the human body through blood. Because the gauze mask body that generally uses on the existing market all is high-efficient filtration material: the melt-blown non-woven fabric or the superfine pore filter cloth is made, the air passing resistance is large and is about 150 pa-250 pa, the pressure generated when a human body exhales normally is small and is about 30 pa-50 pa, if the peripheral edge of the mask body and the face of a person form a seal, foul air can enter a nasal cavity to the lung in advance, the carbon dioxide content in the foul air is very high due to exhalation, so that continuous breathing is repeated, the carbon dioxide content in the inhaled air is higher and higher, the oxygen content in the inhaled air is lower and lower, serious oxygen-poor breathing is caused, and the mask body is stuffy and blocked and cannot breathe, and great harm is caused to the body of a wearer of the mask body.

From modern physics, the theory of aerodynamics shows that air flow is caused by the pressure difference and temperature difference between air, the pressure of human body when exhaling is about 30-50 pa, the gas flow resistance of high-efficiency filter cloth used by the mask is about 150-250 pa, and the positive pressure of exhaling is smaller than the pressure of the mask, so that when wearing the mask, the foul air discharged during exhaling cannot be discharged to the atmosphere from the mask, the discharged foul air (carbon dioxide) can be retained in the cavity between the mask and the human face, and the foul air (carbon dioxide) can firstly enter the nasal cavity when inhaling, so that severe anoxic breathing is caused, and the feeling of stuffiness and blockage is caused.

Disclosure of Invention

The invention aims to provide a method for separately treating expiration and inspiration, namely a breathing sub-channel, so as to solve the problems that when the peripheral edge of the traditional mask body is sealed with the face of a person, foul air enters the nasal cavity to the lung in advance, and due to the fact that the carbon dioxide content in the exhaled foul air is high, the carbon dioxide content in the inhaled air is higher and higher, the oxygen content in the inhaled air is lower and lower, serious oxygen-deficient breathing is caused, the mask body feels stuffy and blocked, the breathing cannot be performed, and great harm is caused to the body of a wearer of the mask body.

In order to achieve the purpose, the invention provides the following technical scheme: a method of treating exhalation separately from inhalation, comprising the steps of:

s100, dividing respiration into an expiration channel and an inspiration channel by utilizing power and energy of a respiratory system of a human body;

s200, when the human respiratory system exhales, the exhaled gas is exhausted through the exhalation channel;

s300, when the human respiratory system inhales, gas is inhaled through the inhalation passage.

Preferably, the method for treating separately from exhalation and inhalation according to the present invention, the dividing of respiration into an exhalation channel and an inhalation channel by using the power and energy of the respiratory system of the human body includes the steps of:

s110, taking nasal breathing as a main factor, and dividing breathing into an expiration channel and an inspiration channel by using the expiration positive pressure and the inspiration negative pressure when a human body breathes.

As a method for treating exhalation separately from inhalation according to the present invention, preferably, when the human respiratory system exhales, the step of exhausting exhaled gas through the exhalation passage specifically includes the steps of:

s210, when the human respiratory system exhales, the exhaled gas is discharged from the nasal cavity and enters the inner part of the breathing conduit through the nasal cavity joint;

s220, the gas exhaled by the respirator enters the exhaust box and is exhausted to the outside of the respirator body through the breather valve.

Preferably, the method for separately treating exhalation and inhalation according to the present invention further includes the steps of:

s221, because the pressure between the air suction port and the mask body is smaller than the pressure in the respiratory tract, the exhaled air pushes open a valve plate which is made of a hard film and connected with the exhaust box through a valve arm made of a flexible film, and the valve plate is exhausted from an exhaust port.

As a method for treating exhalation separately from inhalation according to the present invention, preferably, when the respiratory system of the human body inhales, the inhalation of the gas through the inhalation passage specifically includes the steps of:

s310, when the respiratory system of the human body inhales air, the inhaled air presses the valve plate and the self gravity of the valve plate to close the valve plate and the breathing conduit, and the air is filtered by the mask body, enters the breathing conduit from the air suction port and enters the nasal cavity through the nasal cavity joint;

s320 the respiratory system of the human body receives oxygen from the inhaled gas and provides the oxygen to the main organs of the body through the blood flow.

Preferably, as a method for separately treating exhalation and inhalation according to the present invention, when the human respiratory system exhales, the exhaled gas is discharged from the nasal cavity, enters the interior of the breathing conduit through the nasal cavity connector, enters the exhaust box, and is discharged to the outside of the mask body through the breather valve includes the steps of:

s211 when the exhaled gas passes through the breathing duct pipe, the gas exchanges heat with a heat exchanger arranged inside the breathing duct pipe, and the heat exchanger stores heat energy in the exhaled gas.

Preferably, as a method for separately treating exhalation and inhalation according to the present invention, when the respiratory system inhales, the gas is filtered by the mask body, enters the breathing conduit through the inhalation port, enters the nasal cavity through the nasal cavity connector, and the respiratory system extracts oxygen from the inhaled gas, and the oxygen is provided between the main organs in the body through the blood flow, including the steps of:

s311 the gas flowing through the breathing conduit is heated by passing through a heat exchanger.

In the method for treating separately from inhalation and exhalation according to the present invention, the heat exchanger is preferably a metal member, and the heat exchanger is formed in a corrugated plate shape and is attached to an inner wall of the upper half portion of the breathing conduit.

The invention also provides a breathing sub-channel which comprises a mask body, wherein a breathing catheter is arranged in the mask body, a nasal cavity joint is arranged at one end, close to the nasal cavity, of the breathing catheter, an air suction port and an exhaust box are arranged at one end, far away from the nasal cavity, of the breathing catheter, a breathing valve is arranged in the exhaust box, an air exhaust port is formed in one side, facing the outside of the mask body, of the exhaust box, an expiration channel is formed between the breathing catheter and the exhaust box, and an inspiration channel is formed between the breathing catheter and the air suction port.

Preferably, as a breathing sub-channel of the present invention, the breathing valve includes a valve plate and a valve arm, the valve plate is connected to an inner wall of the exhaust box through the valve arm, the valve plate is made of a hard film, and the valve arm is made of a flexible film.

As a preferred breathing sub-channel of the present invention, a heat exchanger is mounted on an inner wall of an upper half portion of the breathing conduit, the heat exchanger is a member made of a metal material, and the heat exchanger has a corrugated plate structure.

As a breathing sub-channel of the present invention, preferably, one end of the breathing conduit extending into the exhaust box is a breathing conduit end, and the breathing conduit end is chamfered.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the breathing sub-channel, about 95% of exhaled air can be rapidly exhausted to the atmosphere from the first breathing valve and the second breathing valve, the phenomenon that exhaled carbon dioxide is retained in a space between the mask body and a face is eliminated, due to the rapid exhaust of exhaled air, the air pressure between the face and the mask body is low, air outside the mask body can rapidly enter after being filtered during inhalation, sufficient air quantity is ensured during inhalation, insufficient inhaled air cannot be felt, and effective guarantee is provided for the safety and health of a human body; the change of the human body exercise amount can cause the change of the breathing air amount, the breathing channel dividing technology can meet the breathing requirements of various normal working states of the human body, the problem that people are blocked when wearing the mask body is solved, and effective guarantee is provided for the safety and health of the human body.

(2) The breathing conduit is internally provided with a heat exchanger, the heat exchanger stores heat energy in the heat exchanger during expiration, and releases the heat energy into inhaled air during inspiration, and the heat exchange mode belongs to single-channel heat exchange, and hot air and cold air circulate in the same channel, and heat and moisture exchange is carried out at the same position by utilizing the time difference between expiration and inspiration.

Drawings

Fig. 1 is a schematic view of a breathing sub-channel during inhalation according to the present invention.

Fig. 2 is a schematic view of the breathing sub-channel during inhalation.

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is an enlarged view of a portion of FIG. 2 at B;

in the figure: 1. a mask body; 2. the nasal cavity; 3. a nasal cavity joint; 4. a breathing conduit; 5. a heat exchanger; 6. An exhaust port; 7. an exhaust box; 8. an air suction port; 9. a breathing conduit end; 10. a valve plate; 11. a valve arm.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides the following technical scheme: a method of treating exhalation separately from inhalation, comprising the steps of:

Specifically, the method for dividing the breath into an exhalation channel and an inhalation channel by using the power and energy of the respiratory system of the human body specifically comprises the following steps:

Specifically, when the human respiratory system exhales, the step of exhausting the exhaled gas through the exhalation passage specifically includes:

s210, when the human respiratory system exhales, the exhaled gas is discharged from the nasal cavity and enters the inner part of the breathing conduit 4 through the nasal cavity joint 3;

Specifically, the exhaled gas get into in the exhaust box, discharge to the outside specific step that includes of gauze mask body through the breather valve:

Specifically, when the respiratory system of the human body inhales, the step of inhaling the gas through the inhalation passage specifically comprises the following steps:

s310, when the respiratory system of the human body inhales air, the inhaled air presses the valve plate and the self gravity of the valve plate to close the valve plate and the breathing conduit, and the air is filtered by the mask body, enters the breathing conduit 4 from the air suction port 8 and enters the nasal cavity 2 through the nasal cavity joint 3;

Specifically, when human respiratory exhale, exhaled gas is discharged by the nasal cavity, through the nasal cavity connect 3 enter into the inside of breathing pipe 4 with exhaled gas get into in the exhaust box, discharge to the gauze mask body outside between including the step through the breather valve:

Specifically, when the human respiratory system breathes in, gaseous through the gauze mask body filtration, enter into breathing pipe 4 by induction port 8 in, get into nasal cavity 2 and the human respiratory system catches down oxygen from inspiratory gas through nasal cavity joint 3, provide the oxygen to in vivo between the main organ including the step through blood flow:

Specifically, the heat exchanger is a component made of metal, is corrugated, and is mounted in the inner wall of the upper half part of the breathing conduit.

In the embodiment, to solve the breathing problem when people wear the mask, the related characteristics of the breathing system in the human engineering are firstly known and are closely combined with the related characteristics of the human engineering according to the modern physical science. To realize the respiratory sub-channel, the power and energy of the human body during breathing are firstly utilized. Firstly, the nasal respiration is used as the leading factor, the expiratory positive pressure and the inspiratory negative pressure during the respiration of a human body are fully utilized, and the general scheme of the respiration subchannel is determined by combining the theory of hydrodynamics and material mechanics in modern physics. The respiratory sub-channel system is used for dividing the breath into an expiration channel and an inspiration channel which are communicated respectively, and mainly comprises a nasal cavity ventilation guide disc, a breathing conduit, a breathing valve, an exhaust box and filter cloth (or a mask). According to the characteristics of breathing alternation and continuous proceeding in human engineering, the breathing sub-channel system has the following design points to the breathing valve: firstly, because convert from exhaling into breathing in, only 1 ~ 3 seconds's time, the discharge of exhaling will be quick, and the discharge amount is big, and the speed that the breather valve opened should be fast, and the space of opening will be big, and the breather valve adopts the rocking arm formula to open the structure, and wherein rigid film is the valve plate, and flexible film is the valve arm, and the valve plate is located on breathing pipe discharge port, and the valve arm is fixed on the valve seat spare on one side, and the valve plate is opened and is fan-shaped motion with the closure. The valve arm can be set to a length which can determine the opening height of the valve plate, and the valve plate can exhaust foul smell to atmosphere instantly only when the valve arm has a larger opening height, so that the retained foul smell is less, and smooth expiration can be achieved. The faster and cleaner the exhalation is, the more favorable the inhalation is, and the smooth exhalation can be achieved. Secondly, the breath valve is light in weight because the breath is converted into inspiration from expiration, the expiratory positive pressure is about 30 pa-50 pa, and the breath valve (with the thickness of 0.1-0.15 mm) made of the high polymer material film can meet the requirement. And thirdly, because the breath is quickly converted into the inspiration, the closing of the breather valve is required to be closed, the negative pressure (about-30 pa to-50 pa) is generated in the nasal cavity during the inspiration, the negative pressure is generated in the cavity between the mask and the face in the expiration conduit, the breather valve plate can automatically close downwards under the action of the earth gravity, and the valve plate can close tightly under the action of the negative pressure in the expiration conduit. Because the cavity between the mask and the face is negative pressure (about-30 pa to-50 pa), the air outside the mask enters the cavity inside the mask after being filtered by the filter cloth and enters the breathing conduit and the nasal cavity through the air suction port. The air in the atmosphere can not get into from the breather valve reversal when closing, and the mounting means of breather valve is the level setting, and the vertical direction is fan-shaped motion, and the breather valve setting is in the exhaust box, and the exhaust box is provided with the gas vent, and the gas vent can lead to the atmosphere. The exhaust box is a buffer area with internal and external pressure, and can prevent air in the atmosphere from reversely entering. And fourthly, the breathing valve is quickly converted into inspiration from expiration, the breathing valve is arranged on two sides of the face, and the breathing valve is opened right ahead when being worn by a person, so that various postures of the human body in work or life can be met. Fifthly, because the exhalation is quickly converted into inhalation, when the outdoor temperature is below 5 ℃, the exhaust port of the breather valve can generate condensed water, the valve plate can be adhered to the outlet to influence the opening of the breather valve, and therefore, the exhaust outlet is provided with a chamfer angle, the adhesion contact area is reduced, and the normal use of the expiratory valve can be met.

The design of the breathing conduit is characterized in that the breathing conduit is rapidly converted from expiration to inspiration, and the breathing conduit is connected to the breathing valve from the nasal cavity to the nasal cavity joint to achieve sealing. Because the exhalation is quickly converted into inhalation, when the outdoor temperature is lower (below 5 ℃) in winter, the cold outdoor air enters the nasal cavity after being filtered, the nasal cavity feels uncomfortable, a temperature rising device is designed in the breathing conduit, the heat exchanger stores heat energy in the heat exchanger during exhalation, and the heat energy is released into the inhaled air during inhalation. The heat exchange mode belongs to single-channel heat exchange, hot air and cold air circulate in the same channel, and heat and humidity exchange is carried out at the same position by utilizing the time difference between expiration and inspiration. Belongs to a very special heat exchange process in the field of heat transfer science, is the first example of the world and has research value.

The respiratory sub-channel is an innovative exploration of the respiratory protection measures of the human body. The first disclosure in the world is that a breather valve is manufactured by utilizing a high polymer material film, which is the first example in the world. The breathing sub-channel system is formed by combining a nasal cavity joint, a breathing conduit, a breathing valve, an exhaust box and a filter cloth (or mask) heat exchanger, and the breathing sub-channel system realizes the circulation of breathing and breathing sub-channels by utilizing the positive expiratory pressure and the negative inspiratory pressure when a human body breathes. When the nasal respirator exhales, the exhaled foul air can be quickly discharged into the atmosphere, and when the nasal respirator inhales, the filtered air can quickly and sufficiently enter the nasal cavity, so that smooth and refreshing exhalation can be felt, and the nasal respirator inhales fresh and comfortable air.

There are several different ways of channeling:

the breathing sub-channel breathing filter device is formed by combining a built-in sub-channel breathing device and a mask.

The external decorative mask, the sub-channel breathing device and the filter bag are combined into the breathing sub-channel filtering device.

The external decorative mask, the sub-channel breathing device and the filter box are combined into the breathing sub-channel filter device.

The breathing sub-channel filtering device is formed by combining an external decorative mask, a sub-channel breathing device and a filter bag, and arranging a filter at an exhaust port of an exhaust box (can be used in the medical industry).

As shown in fig. 1-4:

Fig. 2 is a schematic view of the breathing sub-channel during inhalation.

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is an enlarged view of a portion of FIG. 2 at B;

the invention provides a breathing sub-channel which comprises a mask body 1, wherein a breathing conduit 4 is arranged in the mask body 1, a nasal cavity joint 3 is arranged at one end, close to a nasal cavity 2, of the breathing conduit 4, an air suction port 8 and an exhaust box 7 are arranged at one end, far away from the nasal cavity 2, of the breathing conduit 4, a breathing valve is arranged in the exhaust box 7, an air exhaust port 6 is formed in one side, facing the outside of the mask body 1, of the exhaust box, an expiration channel is formed between the breathing conduit 4 and the exhaust box 7, and an inspiration channel is formed between the breathing conduit 4 and the air suction port 8.

Specifically, the breather valve includes valve plate 10 and valve arm 11, valve plate 10 with the inner wall of exhaust box 7 passes through valve arm 11 and connects, valve plate 10 is made for the stereoplasm film, valve arm 11 is made for the flexible film.

Specifically, a heat exchanger 5 is mounted on the inner wall of the upper half portion of the breathing conduit 4, the heat exchanger 5 is a component made of metal, and the heat exchanger 5 is of a corrugated plate structure.

Specifically, the one end that respiratory conduit stretched into inside the exhaust box is respiratory conduit tip, respiratory conduit tip chamfer sets up, reduces the area of contact of valve plate and respiratory conduit tip for the valve plate can be opened easily.

In this embodiment, the exhaust box sets up in the both sides of gauze mask body, avoids setting up in gauze mask body middle part, shelters from the sight when the person of wearing hangs down the work.

The working principle and the using process of the invention are as follows: people wear the breathing sub-channel device and the mask to breathe, when breathing, positive pressure is formed in the nasal cavity of a human body, and foul smell discharged from the nasal cavity is transmitted to the breathing conduit through the nasal cavity joint, then transmitted to the breather valve, transmitted to the exhaust box, transmitted to the outlet of the exhaust box and finally transmitted to the atmosphere; when breathing in, negative pressure exists in the nasal cavity, and negative pressure exists in the breathing conduit and the cavity between the mask and the face of the human body. The polluted air is filtered by the mouth mask from the outer side of the mask, enters the cavity between the mouth mask and the face of the human body, and then enters the breathing conduit to the nasal cavity through the suction port of the breathing conduit. The breathing treatment is carried out alternately according to the sequence, so that the circulation process of expiration and inspiration can be completed, the circulation of breathing sub-channels is realized, and the aim of separately treating expiration and inspiration is fulfilled.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A method of treating exhalation separately from inhalation, comprising the steps of:

2. The method as claimed in claim 1, wherein the step of separating the breath into an expiratory channel and an inspiratory channel using the power and energy of the respiratory system of the human body comprises the steps of:

3. The method of claim 1, wherein when the respiratory system exhales, the exhaled gas is exhausted through the exhalation passage, comprising the steps of:

4. The method for separately disposing exhalation from inhalation according to claim 3, wherein the step of exhausting the exhaled air to the exterior of the mask body via the breather valve after entering the exhaust box comprises:

5. The method of claim 1, wherein the step of inhaling the gas via the inhalation channel when the respiratory system inhales comprises the steps of:

6. The method for separating expiration from inspiration as claimed in claim 3, wherein when the human respiratory system exhales, the exhaled gas is discharged from the nasal cavity, enters the inner part of the breathing conduit through the nasal cavity joint, enters the exhaust box through the exhaled gas, and is discharged to the outside of the mask body through the breather valve, comprising the steps of:

7. The method of claim 5, wherein when the respiratory system inhales, the air is filtered through the mask body, enters the breathing conduit through the air inlet, enters the nasal cavity through the nasal cavity connector, and the respiratory system extracts oxygen from the inhaled air, and the oxygen is provided to the internal major organs through the blood flow, comprising the steps of:

8. A method of treatment of the type set forth in claim 6 or 7 wherein said heat exchanger is a metal component and is corrugated and mounted in the inner wall of the upper half of said breathing conduit.

9. The utility model provides a breathe and divide passageway, its characterized in that, includes the gauze mask body, the internally mounted of gauze mask body has breathing pipe, the one end that breathing pipe is close to the nasal cavity is provided with the nasal cavity and connects, breathing pipe keeps away from the one end of nasal cavity is provided with induction port and exhaust box, install the breather valve in the exhaust box, the exhaust box is opened towards the outside one side of gauze mask body has the gas vent, form the expiration passageway between breathing pipe and the exhaust box, form the inspiration channel between breathing pipe and the induction port.

10. The breathing bypass according to claim 9, wherein the breathing valve comprises a valve plate and a valve arm, the valve plate is connected with the inner wall of the exhaust box through the valve arm, the valve plate is made of a hard film, and the valve arm is made of a flexible film.

11. The breathing subchannel of claim 9 wherein the inner wall of the upper half of the breathing conduit is fitted with a heat exchanger, the heat exchanger is a metal component, and the heat exchanger is of a corrugated plate-like structure.

12. The breathing sub-channel of claim 9, wherein the end of the breathing conduit extending into the exhaust box is a breathing conduit end portion, and the breathing conduit end portion is chamfered.