WO1997006054A1

WO1997006054A1 - Air bag for a half-closed type breathing device

Info

Publication number: WO1997006054A1
Application number: PCT/JP1995/001559
Authority: WO
Inventors: Yukio Yoshikawa; Shunsuke Matsuoka
Original assignee: Grand Bleu Inc.
Priority date: 1995-08-03
Filing date: 1995-08-03
Publication date: 1997-02-20
Also published as: KR970706168A; AU3191295A; EP0782954A1

Abstract

An air bag (9) for a half-closed type breathing device (1) is a seamless integrally molded piece which is blow molded from urethane resin. An opening of this air bag (9) is constructed so as to be screwed into the main body of the half-closed type breathing device (1) for fixation, whereby replacement work can easily be performed. Since there is no seam formed in the air bag according to the present invention, there is no need to inspect the strength of a seam, facilitating the production control. Since the air bag (9) is molded from urethane resin, the durability and the like thereof can be improved. In addition, since the air bag (9) is blow molded, uniform size and high productivity can be realized.

Description

Title of invention

Semi-closed respirator air bag

Technical field

According to the present invention, the exhaled gas that has been recovered from a mouthpiece is regenerated by passing it through a carbon dioxide adsorbing device, and the regenerated gas is supplied from a respiratory gas cylinder.

Rice field

The present invention relates to a semi-closed respirator configured to supply a constant flow of newly inspired gas to a mouthpiece as inspired gas and exhaust excess gas to the outside. More specifically, the present invention relates to an air bag which is arranged as a buffer for respiration in such a device and stores respiratory gas.

Background art

Diving respirators are generally classified into two types: open respirators and closed or semi-closed respirators. In an open-type breathing apparatus, all gas once breathed is discharged out of the apparatus, and in a closed-type or semi-closed-type respiratory apparatus, a device that can rebreath the breathed gas is built in. ing.

When diving with open respirators, the same volume of gas is breathed, regardless of ambient pressure or depth. Therefore, the consumption of respiratory gas increases as the ambient pressure increases. If gas cylinders are used, that is, if the amount of breathable gas is limited, the dive time will decrease as the depth increases.

In contrast, closed and semi-closed respirators use compressed gas as the source of respiration, similar to the open type, but have the same weight of gas regardless of ambient pressure. Breathed. Therefore, in the closed type and semi-closed type, the consumption of respiratory gas is constant regardless of the depth. For this reason, the amount of respiratory gas to be carried is significantly smaller than that of the open type, and by changing the mixing ratio of the respiratory gas, it is possible to dive for a long time to a depth that is not possible with the open type. it can.

In this way, closed or semi-closed respirators have the advantage of being lighter in weight and capable of deep diving for a longer time than open respirators. However, conventional closed and semi-closed respirators have been developed for special diving and military purposes, so they have only minimal safety mechanisms and are relatively prone to emergencies. There is no mechanism to deal with the situation. For this reason, the use of these devices required considerable thorough training, and leisure divers could not use them easily.

However, with the increasing number of diving enthusiasts, there has been a demand for diving using such closed or semi-closed respirators without much need for complicated operations and skills. I'm getting high. Here, the closed-type respirator is equipped with oxygen concentration sensors, etc., and considerable training is required in their handling, control, monitoring, etc. In contrast, semi-closed respirators do not have such equipment and, therefore, do not require training to operate them, making them relatively easy for non-experts to handle. It would be very convenient if a semi-closed respirator could be used more easily and easily than before.

In view of this point, the applicant of the present application has proposed a semi-closed respirator in Japanese Patent Application No. 5-274484, etc. are doing.

An object of the present invention is to provide a semi-closed respirator in which an air bag that is arranged as a buffer for respiration and stores respiratory gas is improved and manufactured. And to facilitate replacement. Disclosure of the invention

In order to solve the above-mentioned problems, the air bag of the semi-closed breathing apparatus according to the present invention is characterized in that it is a seamless, integrally molded article formed of a synthetic resin. According to the present invention, since the airbag does not have a seam unlike the conventional airbag, it is not necessary to inspect the strength of the seam and the like, and the production management is simplified.

Further, in the present invention, the breathing gas circulation port of the airbag has a screw-in type detachable structure. Therefore, the replacement work can be easily performed. In other words, when a mold or the like needs to be exchanged, it can be easily exchanged for a new one. In addition, since replacement is easy, for example, air bags having different capacities can be prepared according to the difference in the vital capacity of the user, and the optimum air bag can be installed according to the user.

Further, in the present invention, the airbag is formed from urethane resin. By using a urethane resin, the tear strength is higher than that of a rubber material generally used in the past, so that durability and the like can be improved.

Furthermore, in the present invention, the airbag is formed by a blow molding method. If this molding method is adopted, stable size and high mass productivity can be realized. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an external view of a semi-closed breathing apparatus to which the present invention is applied. FIG. 2 is a schematic configuration diagram showing the internal structure of the device of FIG.

Fig. 3 shows the expiratory airbag incorporated in the device of Fig. 1 It is a figure, (a) is the front view, (b) is the partial side view seen from the orthogonal direction.

FIG. 4 is a view showing a regular assembly attached to the apparatus of FIG. 1, (a) is a side view thereof, and (b) is a longitudinal sectional view thereof.

FIG. 5 is a schematic longitudinal cross-sectional view showing a conventional regire. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show the entire configuration of a semi-closed-type respirator incorporating an air bag according to the present invention. As shown in FIG. 1, a semi-closed-type respirator 1 of the present example includes a hollow housing 2, and device components described later are built in the hollow housing 2. One side of the hollow housing 2 is a backing surface 2a that contacts the back of a diver, and an opening for exchanging a respiratory gas cylinder is formed in the center of the opposite surface. 2b is installed. At the upper end of the hollow housing 2, a container 3 with a built-in carbon dioxide adsorption device is mounted horizontally. This container has a cylindrical shape as a whole, and flexible expiratory tubes 4 and inspiratory tubes 5 are connected to outer peripheral portions on both sides thereof. The distal ends of the expiratory tube 4 and the inspiratory tube 5 are connected to a mouthpiece unit 6.

With reference to FIG. 2, main components of the device 1 of the present example and their connection states will be described. As shown in this figure, the respiratory air circulation chamber 61 in the mouthpiece unit 6 communicates with the expiratory tube 4 and the inspiratory tube 5. The other end of the exhalation tube 4 and the other end of the inhalation tube 5 communicate with both sides of the cylindrical container 3 in which the carbon dioxide adsorption device 7 is built. That is, a carbon dioxide adsorbing device 7 having an annular cross section is built in the center of the container 3, and an exhalation passage 31 and an inhalation passage 32 are formed on both sides thereof. The lower part of the container 3 containing the carbon dioxide adsorption device 7 In the hollow housing 2, a breathing gas cylinder 8 is disposed in the center in the vertical direction, and an expiration airbag 9 and an inspiration airbag 11 are disposed on both sides of the cylinder. The exhalation air bag 9 communicates with the exhalation passage 31 of the container 3, and the inhalation air bag 11 communicates with the intake passage 32 of the container 3.

The breathing gas cylinder 8 is disposed such that its gas discharge port 81 is located at the lower end, and this gas discharge port 81 is connected to a regulator 83 via an on-off valve 82. In the case of Regille, the gas pressure is reduced to 8 to 9 kilograms Z square centimeters. Six gas supply pipes are connected to the regulator 8 3, three of which are for the residual pressure indicator, for the BC jacket, and for the Octopus (not shown). ). One of the remaining three gas supply pipes 84 extends through the inside of the intake passage 32 and the intake pipe 5 of the container 3 with a built-in carbon dioxide adsorbing device to the inside of the mouse unit. An orifice 84a for flow adjustment is provided in the middle position, through which the flow is adjusted to 4 to 5 liters / min and supplied to the mouthpiece unit. It is as follows. The other gas supply pipe 85 is a purge gas supply pipe used for draining water from the mouthpiece unit 6, and similarly to the gas supply pipe 84 described above, a mouthpiece unit. To 6 The remaining one gas supply pipe 86 is for supplying the intake air in an emergency, and its tip is located in the intake passage 32 of the container 3.

An auto-valve mechanism 12 is attached to an end of the carbon dioxide adsorption device built-in container 3 on the suction side. The mechanism 12 controls the opening and closing of the gas supply pipe 86 and the automatic discharge control of excess gas.

The overall gas flow is as follows. Expiration from the mouthpiece 6 2 of the mouthpiece unit 6 is performed via the expiratory tube 4 and the expiratory passage 31. It is stored in the exhalation air bag 9. During the inhalation operation, the exhaled air stored here is purified by removing carbon dioxide through the carbon dioxide adsorption device 7, and then flows into the intake passage 32. The exhaled air thus purified is stored in the air bag 11 for inhalation, and is supplied into the mouthpiece unit 6 through the intake pipe 5 for inhalation. A constant amount of new intake gas is constantly introduced from the cylinder 8 through the gas supply pipe 84 into the mouthpiece 6 and the mixed gas is supplied as the intake gas. .

FIG. 3 shows an exhalation airbag 9. The air bag 9 is an elastic bag formed of a flexible material, and is capable of expanding and contracting according to a breathing operation. At the upper end of the airbag 9, a connection portion 91 connected to the connection portion 312 formed on the container 3 is formed. The connection portion 91 is detachably connected to the connection portion 312 of the container by a screw-in type. Therefore, the air bag 9 of this example can be easily replaced.

Here, the airbag 9 of the present example is a seamless, one-piece urethane molded product. In this example, the air bag 9 is formed by a blow molding method.

On the other hand, the air bag for inhalation 11 is also a seamless integral urethane molded product like the air bag for exhalation 9. At the upper end, a threaded connection to the container 3 is formed, so that it can be easily replaced.

As described above, the airbags 9 and 11 of this example are seamless urethane molded products. In contrast, air bags conventionally used are made by welding or bonding a rubberized cloth, a molded rubber article, or a nylon cloth coated with urethane or the like. It is molded into a bag and used. However, such a seam

Corrected form (Rule 91) If so, stable production management is difficult. This is because all seams must be inspected for each product, which requires a lot of time. In the present invention, since there is no such a seam, quality control is simplified.

In addition, since the air bag of this example is a urethane molded product, it has a high tear strength, and is superior in durability and the like as compared with conventional air bags made of com. Furthermore, in the past, airbags were assumed to be used semi-permanently, and their replacement was not considered. However, in practice, mold and the like will be generated due to long-term use, and replacement will be required. In this case, this example is convenient because it can be easily replaced by a screw-in type.

In addition to this point, it is convenient to prepare air bags of different capacities according to the lung capacity of the user, for example, so that the most suitable air bag can be installed for the user. For example, prepare two types of airbags, L size (2.1 liter) and S size (1.6 liter), and install airbags that correspond to individual vital capacity. can do.

Next, in the exhalation air bag 9 of the present example, a drainage device 130 for discharging water accumulated at the bottom of the air bag is attached to the outer surface 9a. The drainage device 130 includes a telescopic pressure chamber 13 1 attached to the outer surface 9 a of the air bag 9, a tube 13 2 a communicating with the pressure chamber 13 1, and a tube 13 2 and a tube 1 34 connected to the a through a check valve 13 5, and the other end of the tube 13 4 is connected to an opening 9 2 formed in the bottom of the airbag 9. It is connected. A tube 13 2 is connected between the tube 13 2 a and the check valve 13 5 via a check valve 13 3. 1 3 2b is the back side of device 1 (ie, It is open to the outside at the back of the diver. Check valve 13 5 allows fluid flow only towards the pressure chamber, and check valve 13 3 allows fluid flow only towards the external opening end 13 2 b Things. In the drainage device 130 of this configuration, the pressure chamber 131, which is attached to the bottom surface 9a, contracts and inflates due to the inflating and contracting operation of the exhalation air bag 9, and performs a bombing operation. As a result, the water collected at the bottom of the air bag 9 is discharged to the outside through the outer opening end 132b.

In the exhalation airbag 9 of this example, as shown in FIG. 3, the mounting portion 9 c is provided at the center of the outer surface 9 a so that the pressure chamber 13 1 of the drainage device can be mounted. Are also integrally molded. Further, a mounting portion 9 d for mounting the air bag 9 on the side of the main body housing 2 is also integrally formed.

In this example, the airbag is formed of urethane resin. Instead, various materials such as soft polyethylene, vinyl acetate ethylene copolymer resin, soft vinyl chloride resin, and silicone rubber can be used.

This embodiment is an example in which the present invention is applied to an air bag of a semi-closed respirator. However, the present invention can be similarly applied to air bags of other types of breathing apparatuses.

In this example, urethane resin is used as the material of the airbag. Instead of this, soft polyethylene, vinyl acetate ethylene copolymer resin, soft vinyl chloride, various resins such as elastomers, silicone rubber, rubber and the like may be used.

(Structure of regular evening)

Here, as described above, the regulator 83 of the semi-closed breathing apparatus of the present embodiment reduces the pressure of the supply gas from the breathing gas cylinder to a constant pressure and supplies it. It is for. In general, the supply gas from the respiratory gas cylinder is depressurized to about 9 to 10 k square centimeters by the first stage, and then further depressurized by the second stage.

For example, the first stage has a structure as shown in Fig. 5 for use. The regulator 100 is a non-pressure-sensitive regulator and functions to keep the supply gas amount constant even when the ambient pressure changes. At the end of this regulation 100, a communication chamber 101 communicating with a valve of a breathing gas cylinder (not shown) is formed at the end. The high-pressure gas supplied here from the cylinder is formed in the piston rod 102 a via an on-off valve mechanism 104 composed of a piston valve body 102 and a valve sheet 103. The pressure is supplied to the pressure chamber 106 through the communication passage 105. The pressure chamber 106 is partitioned by a piston head 107 and communicates with the second stage (not shown) via a low-pressure port 108. ing. The piston head 107 is constantly urged by a coil spring 109 from the back side thereof with a constant elastic force. A 0 ring 110 is attached to the outer peripheral surface of the steel head 107, and the pressure setting chamber 111 on which the coil spring 109 on the back side is mounted is airtightly closed. ing. Similarly, on the outer periphery of the tip end of the screw rod 102 a, a 0 ring 112 for sealing the pressure setting chamber 111 and the communication line 105 side in an airtight state is also provided. Installed.

When the valve of the breathing gas cylinder is closed, the piston head 107 is pushed by the spring 109 toward the pressure chamber 106 as shown in Fig. 5, and the on-off valve mechanism 1 is opened. 0 4 is open. When the valve is opened, the high-pressure gas enters the communication chamber 101 from the cylinder, and enters the pressure chamber 106 via the opening / closing valve mechanism 104 and the communication passage 105. Here, low pressure port 108 is closed If it is, the pressure in the pressure chamber 106 increases. When the pressure rises and reaches the set pressure, the pressure in the pressure chamber pushes the steel head 107 against the spring force toward the pressure setting chamber, and the opening / closing valve mechanism 104 closes. The supply of high-pressure gas stops. When the low pressure port 108 is opened, the gas in the pressure chamber 106 is supplied to each part of the external device through the port, so that the pressure in the pressure chamber decreases. When the pressure drops below the set pressure, the piston head 107 is pushed toward the pressure chamber by the spring force, the opening / closing valve mechanism 104 is opened, and the supply of high-pressure gas is resumed. In this way, since the pressure chamber is always maintained at the set pressure, the gas reduced to the set pressure is supplied to each part via the low-pressure port 108.

In such a regime, gas having a set pressure or more may be supplied from the low-pressure port 108 to each part for the following reasons. In other words, if the piston main body 102 and the sheet 103 constituting the on-off valve mechanism 104 have scratches, etc., or if there are manufacturing or installation errors, etc. Even when the pressure exceeds the set pressure, the on-off valve mechanism 104 is not completely closed, and the high-pressure gas leaks into the pressure chamber through this, so that the pressure becomes higher than the set pressure. High gas may be supplied.

Also, if each of the 0-rings 110, 112 is damaged or deformed, or if there is a scratch, deformation, etc. on the side of the inner peripheral surface where they are in contact, these Since the gap is not completely airtight, the high-pressure gas may leak into the pressure setting chamber 1 1 1 via these. When the high-pressure gas enters the pressure setting chamber, the set pressure is determined by the sum of the spring force of the coil spring and the pressure of the gas that has entered here, so that the set pressure is reduced by the gas pressure. As a result, the gas having a pressure higher than the set pressure is supplied to each part from the low-pressure port 108.

In order to eliminate such adverse effects, the gas supplied from the breathing gas cylinder The following configuration may be adopted as the regulation of a diving respirator that reduces high-pressure gas to a preset pressure and sends it out from a low-pressure port. That is, a compartment formed in the regulator housing, a piston slidably disposed in the compartment and dividing the compartment into a pressure chamber and a pressure setting chamber, A communication passage formed in a state penetrating the piston and communicating the gas supply side of the breathing gas cylinder with the pressure chamber; and a communication passage disposed in the pressure setting chamber, the piston being connected to the pressure chamber side. A biasing means for constantly biasing with an elastic force set toward the valve, and the communication passage is closed when the piston piles on the elastic force and moves a certain amount toward the pressure setting chamber. And a release valve configured to maintain the pressure in the pressure setting chamber to be equal to or lower than a set pressure.

Here, a second release valve communicating with the low-pressure port is further provided so that the pressure of the intake gas sent out from the low-pressure port is maintained at a predetermined pressure or lower. Desirable.

In this configuration, a release valve is installed in the pressure setting chamber to prevent the internal pressure from rising. Therefore, when the high-pressure gas enters the pressure setting chamber and the internal pressure exceeds the set value, the high-pressure gas is released to the outside via the release valve. For this reason, the pressure setting chamber does not become high pressure, and the set pressure is always maintained at the value specified by the biasing means.

In addition, if a second release valve is also arranged on the low-pressure port side, if the high-pressure gas cylinder side opens rapidly and high-pressure gas is supplied, or if the low-pressure port side suddenly opens, When the high-pressure gas enters the pressure chamber, it is possible to prevent the high pressure temporarily from acting on each part and the low-pressure port side. That is, the second release valve opens to reduce the internal pressure of the pressure chamber. Therefore, a sudden high pressure gas acts temporarily This can prevent each part from being damaged.

Hereinafter, with reference to FIG. 4, a specific example of the non-pressure-sensitive reguille with the above configuration will be described. This is a part of the semi-closed breathing apparatus 1 shown in Figs.

5

In the drawing, reference numeral 831 denotes a housing for a legible housing, in which a piston 834 composed of a piston head 832 and a piston rod 833 is arranged. I have. The piston head 832 divides the compartment 835 formed in the housing into two parts, and compresses it toward the head surface.

, ο A power chamber 8336 is formed, and a pressure setting chamber 837 is formed on the back side of the head. These two chambers are airtightly partitioned by a 0-ring 838 attached to the outer peripheral surface of the piston head. In the pressure setting chamber 837, a coil spring 840 is mounted between the back of the piston head 832 and the spring sheet 839 formed in the housing. is is biased toward the pressure chamber. The pressure chamber 836 communicates with each of the supply pipes 84, 85, 86, etc., via a low-pressure port 850. The piston rod 833 extends through a through hole 841 formed in the housing. The distal end of the piston rod 833 is connected to a communication chamber 84 communicating with the gas discharge port 81 of the breathing gas cylinder. It protrudes into two. Piston mouth 8

A communication hole 843 is formed in the inside of the 203 along the axial direction thereof, and the communication hole 8443 communicates the pressure chamber 8336 with the communication chamber 842. ing. The space between the communication chamber 842 and the pressure setting chamber 8337 is closed in an airtight manner by a 0-ring 844.

In the communication chamber 8 4 2, it was movably held in the axial direction.

_The valve sheet 846 is held by the 25 guide 845, and this sheet 846 is supported by the sheet receiver 847. Here, an annular valve element 848 is formed at the tip of the piston rod 833 described above. The valve body 848 and the valve seat 846 constitute an on-off valve mechanism 849. Normally, the on-off valve mechanism 849 is open, but it closes when the steel head 832 moves to the pressure setting chamber 837 side by staking the spring force. In addition, a filter 852 supported by a filter retainer 851 is mounted in the communication chamber 842.

In addition, 853 is a yoke, and 854 is a yoke knob attached here. The tip of the yoke 853 is attached to the outer surface of the housing 831.

Here, a release valve 860 is attached to the side wall of the housing 831. The valve 860 includes a communication chamber 861 communicating with the pressure setting chamber 837, a valve element 862 disposed therein, and a coil spring 863 that biases the valve body 862. It is composed of a valve cover 864 and an external communication chamber 865 open to the outside. The valve body 862 is constantly pressed against the sheet surface formed by the 0-ring 866 by the coil spring 863, and shuts off the communication chamber 861 and the externally open chamber 865.

Next, a second release valve 880 is attached to a communication passage 870 that communicates the low-pressure port 850 with the pressure chamber 831. This release valve 880 also has the same configuration as the release valve 860 described above. That is, there is provided a valve body 882 pressed by a spring force, and the valve body 882 blocks the externally open chamber 885 from the pressure chamber 831 side. When the valve body 882 moves in a pile due to the spring force, the pressure chamber 831 communicates with the externally open chamber 885, and the pressure in the pressure chamber is released to the outside.

The operation of the regulator 83 having this configuration will be described. First, when the gas discharge port 81 is closed, the screw head 832 is urged toward the pressure chamber by the spring force, so that the on-off valve mechanism 849 is open. Also, In the lease valve 8660, the valve body 862 is urged by the spring force, and the external opening chamber 865 is isolated from the pressure setting chamber 837. When the gas discharge port 8 1 is opened, the high-pressure gas enters the pressure chamber 8 36 through the communication chamber 8 42, the valve opening and closing mechanism 8 49, and the communication hole 8 43. Here, when the downstream side of the low-pressure port 850 is closed, the internal pressure of the pressure chamber 836 increases. When the internal pressure exceeds the set pressure, the piston head 832 is pushed by the spring force and moved toward the pressure setting chamber 837 to move. As a result, the on-off valve mechanism 849 is closed, and the supply of high-pressure gas is stopped. When the downstream side of the low-pressure port 850 is opened and the supply of low-pressure gas is started, the pressure in the pressure chamber decreases, and the piston head 832 is pushed toward the pressure chamber by spring force. As a result, the on-off valve mechanism 849 opens again, and the supply of high-pressure gas resumes. By repeating this operation, the gas at the set pressure is supplied from the low pressure port 850 to the supply pipes 84 to 86.

Here, the operation when the high-pressure gas leaks and the leaked high-pressure gas enters the pressure setting chamber 837 will be described. In this case, the internal pressure of the pressure setting chamber increases due to the invading gas. When this internal pressure rises by a certain value or more, the valve body 826 of the release valve 860 is pushed and moved by the spring force by the increased pressure. As a result, the side of the pressure setting chamber 837 and the externally open chamber 865 are connected and disconnected. For this reason, the gas in the pressure setting chamber is discharged outside through the release valve. When the pressure in the pressure setting chamber decreases, the release valve 860 closes again.

As described above, in this example, since the configuration in which the release valve 860 is attached to the regulator 83 is adopted, even if leakage of high-pressure gas occurs inside Therefore, the normal operation of the regulator is not interrupted, and the gas having a pressure higher than the set pressure is not supplied to the supply pipes 84 to 86.

In this example, the second release is also provided on the low-pressure port 850 side. The configuration in which the valve 880 is arranged is adopted. Therefore, even if the pressure chamber 831 temporarily becomes in a high pressure state, it is possible to prevent the high pressure gas from being directly sent out from the low pressure port 850. In this case, the second release bubble 8880 is opened, and the pressure in the pressure chamber 831 is reduced to a preset pressure. Therefore, even when the high pressure gas is supplied by rapidly opening the valve, it is possible to prevent the high pressure gas from temporarily acting on the low pressure port side. In addition, even when the above-mentioned release valve 860 does not function properly, the gas released from the low-pressure port can be maintained at a certain pressure or less by the second release valve 880. effect

4) Yes.

It should be noted that the above-described reguilleur can be applied to a respirator of a type other than the semi-closed respirator, for example, a closed respirator.

As described above, the release bubble is arranged in the reguille of the semi-closed respirator for reducing the high pressure gas supplied from the respiratory gas cylinder to the preset pressure, and The high-pressure gas leaked in the evening is discharged to the outside through here. Therefore, according to the present invention, it is possible to avoid a problem that a gas higher than the set pressure is supplied to the downstream side of the breathing circuit due to the high-pressure gas leaking inside the regulator. . In addition, by arranging the second release valve communicating with the low-pressure port side, the gas pressure sent from the low-pressure port can be reliably maintained at or below the set pressure. Industrial applicability

As described above, the air bag of the semi-closed-type respirator of the present invention is characterized in that it is a seamless integrally molded product formed of a synthetic resin. According to the present invention, since the airbag does not have a seam unlike the conventional airbag, it is necessary to inspect the seam strength and the like. Without the production management will be easier.

Further, in the present invention, since the breathing gas flow opening of the air bag is of a screw-type detachable structure, the replacement operation can be easily performed. In addition, since replacement is easy, for example, an air bag having a different capacity can be prepared according to the difference in the vital capacity of the user, and an optimum air bag can be mounted according to the user.

Further, in the present invention, the air bag is formed from urethane resin. By using a urethane resin, durability and the like can be improved as compared with a conventional air bag.

Furthermore, in the present invention, the air bag is formed by a blow molding method. If this molding method is adopted, stable size and high mass productivity can be realized.

Claims

The scope of the claims

1. A respiratory air bag for a semi-closed respirator, wherein the respiratory air bag is a seamless, single-piece molded product made of synthetic resin. Air bag.

2. The airbag according to claim 1, wherein the respiratory gas flow opening of the airbag has a structure that can be screwed on and removed from the main body of the semi-closed respirator. .

3. The airbag according to claim 1 or 2, wherein the airbag is an integrally molded article of urethane resin.

4. The air bag according to any one of claims 1 to 3, wherein the air bag is formed by a professional molding method.

用紙 Corrected paper (Rule 91)