JPH1085348A - Open type respiratory apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an open type respiratory apparatus effectively preventing freezing at a lung strength valve. SOLUTION: The open type respiratory apparatus is provided with a pressure container 2, a pressure reducing valve 4 for reducing pressure of an inspiratory gas from the pressure container 2, a lung strength valve 6 opening and closing according to respiration, a face mask 8, a supplying path way 12 connecting the pressure container 2 and the pressure reducing valve 4, a flow path for sending and supplying connecting the pressure reducing valve 4 and the lung strength valve 6 and a flow path for supplying respirating gas connecting the lung strength valve 6 and a mask 10. A mounting means 20 for mounting the pressure container 2 comprises a container fixing part 22 for mounting the pressure container 2, shoulder band 26, 28, breast band 30, 32, and the lung strength valve 6 is mounted on the breast band 30 and a connecting part at the exhaust side of the lung strength valve 6 mounted at the breast band 30 extends to the essentially horizontal direction or slightly downward at the mounted state and an air supply pipe 18 has a corrugated pipe part having ring type waves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an open respirator.

[0002]

2. Description of the Related Art An example of an open respirator is disclosed in Japanese Utility Model Publication No. Sho 62-11630. This known open respirator includes a pressure vessel filled with a respiratory gas, a pressure reducing valve for reducing the pressure of the respiratory gas from the pressure vessel, a pulmonary valve that opens and closes according to the wearer's breathing, It has a face body covering the front of the head of the person. The lung valve is
It is arranged at the bottom of the face, corresponding to the mouth of the wearer,
The pressure vessel and the pressure reducing valve are connected via a supply channel, and the pressure reducing valve and the pulmonary valve are connected via an air supply channel. In this type of respirator, the high pressure gas from the pressure vessel is
The pressure is supplied to the pressure reducing valve through the supply flow path, and the pressure is reduced to a medium pressure by the action of the pressure reducing valve. The respiratory gas depressurized by the pressure reducing valve is supplied to the pulmonary valve via the supply channel. The valve element of the pulmonary valve opens and closes in response to the wearer's breathing (opens by inhalation), and thus is depressurized (substantially to atmospheric pressure) from the pulmonary valve to the faceplate in response to the wearer's breathing ) Intake gas is supplied.

[0003]

However, the above-mentioned open respirator has the following problems to be solved. In general, in an open respirator, respiratory gas at moderate pressure is reduced to almost atmospheric pressure by a pulmonary valve,
Due to this pressure reduction, adiabatic expansion of the respiratory gas is performed in the vicinity of the valve element of the pneumatic valve. When the breathing gas expands adiabatically,
As a result, the surrounding heat is deprived and the temperature is lowered, and is lowered, for example, about 5 ° C. from the surrounding temperature.

[0004] Open respirators are widely used, for example, in fire fighting activities in which toxic gas, smoke, etc. are generated, or when they are likely to occur. There is a risk of invading. In particular, when the facepiece is held by the wearer without wearing it, or when it is hung on a belt or the like worn by the wearer, the face on which the facepiece is mounted is opened. Easy to invade. When water enters the facepiece in this way,
The intruded water may reach the pulmonary valve, and water may accumulate in the valve element of the pulmonary valve and in the vicinity thereof. When water accumulates in the valve element of the pneumatic valve and its vicinity, when the ambient temperature is, for example, about 5 ° C. or less, the temperature near the valve element drops below freezing point due to adiabatic expansion of respiratory gas in the pneumatic valve. Water freezes. When such freezing occurs, the valve element and the valve seat of the pneumatic valve are fixed by the ice, and the opening and closing operation of the valve element becomes impossible, and supply of breathing gas from the pressure reducing valve to the face element becomes impossible.

[0005] It is an object of the present invention to provide an open respirator that can effectively prevent freezing in a pneumatic valve.

[0006]

SUMMARY OF THE INVENTION The present invention provides a pressure vessel filled with breathing gas, a pressure reducing valve for reducing the pressure of breathing gas from the pressure vessel, a pulmonary valve which opens and closes in response to breathing, and a faceplate. A supply flow path connecting the pressure vessel to the pressure reducing valve, a supply flow path connecting the pressure reducing valve to the lung force valve, an air supply flow path connecting the lung force valve to the face plate, and mounting the pressure vessel. Mounting means for the, the mounting means, a container mounting portion to which the pressure vessel is mounted, and a pair of shoulder bands connected to the container mounting portion,
A pneumatic valve includes a housing, a supply-side connection and a discharge-side connection provided in the housing, and a pulmonary valve body disposed in the housing. And a valve seat, wherein the supply-side connection is communicated with the supply flow path, the discharge-side connection is communicated with the air supply flow path, and the pulmonary valve body is separated from the valve seat for breathing from the pressure reducing valve. Gas is delivered to the facepiece, the lung valve housing is mounted on the chest band of the mounting means, and the outlet connection of the lung valve extends substantially horizontally or below when mounted on the chest band. The air supply pipe that defines the air supply flow path is an open-type breathing apparatus characterized in that at least a part of a serpentine pipe section provided with a plurality of ring-shaped wave peaks in the longitudinal direction is provided. According to the invention, the housing of the pneumatic valve is mounted on the chest band of the mounting means, in which mounting the outlet connection of the pneumatic valve extends substantially horizontally or below. Therefore, even if water invades from the open surface of the face body, the invading water hardly reaches the pulmonary valve, and is retained in the air supply passage. Therefore, the water that causes freezing is prevented from flowing to the pneumatic valve, and freezing in the pneumatic valve is effectively prevented. In addition, since the air supply pipe that defines the air supply flow path has at least a part of a serpentine pipe section in which a plurality of ring-shaped wave peaks are provided in the longitudinal direction, water that intrudes from the face body and flows through the air supply flow path is this It is held by the flexible tube portion and is prevented from flowing further downstream toward the pulmonary valve.

Further, according to the present invention, the housing of the pneumatic valve is partitioned by a diaphragm into an atmospheric pressure chamber communicating with the atmosphere and an intake pressure chamber communicating with the face plate, and the intake pressure chamber is attached to a chest band. Has a water reservoir located below the valve seat. According to the present invention, since the suction pressure chamber of the housing of the pneumatic valve is provided with a water reservoir located below the valve seat, external water may temporarily enter the pulmonary valve through the air supply pipe from the face body. Even if it does, the invading water is stored in the water reservoir of the intake pressure chamber, and is prevented from reaching the valve body.

Further, according to the present invention, the air supply pipe comprises a coiled pipe in which a ring-shaped wave peak is provided over substantially the entire length thereof in the longitudinal direction, and the coiled pipe is formed from a face when the pulmonary valve is attached to the chest band. It has a curved part which bends substantially 90 degrees or more toward the pulmonary valve. According to the present invention, since the air supply pipe is formed of a coiled pipe, even if water invades from the open surface of the facepiece, the intruded water can flow toward the pulmonary valve by the wave peak of the coiled pipe. It is prevented and retained in the corrugation of the coil. In addition, since the serpentine tube has a curved portion that is bent substantially 90 degrees or more from the face body to the lung power valve, the flow of water from the face body to the lung power valve is further increased by the presence of the curved portion. Effectively prevented.

Further, according to the present invention, the mounting means is provided with a suspending member, and the face member is provided with a fixture suspended by the suspending member.
The connection between the face body and the air supply pipe is located on the upper side. According to the present invention, when the attachment of the face body is attached to the hanging member of the chest band, the connection portion between the face body and the air supply pipe is located on the upper side, and therefore, one end of the air supply pipe extending from the face body toward the lung force valve ( The connection with the facepiece) extends upwards, thus preventing water from entering the air supply pipe from the open face of the facepiece.

[0010]

FIG. 1 is a front view showing an embodiment of an open-type respirator according to the present invention, FIG. 2 is a simplified system diagram of the respirator of FIG. 1, and FIG. It is a perspective view which shows the state which the wearer wore the respirator of FIG. 1 to 3
1, the illustrated open respirator includes a pressure vessel 2, a pressure reducing valve 4, a pulmonary valve 6, a face body 8, and an exhalation valve 10.
The pressure vessel 2 is filled with a breathing gas, for example, air under pressure. The gas in the pressure vessel 2 has a relatively high pressure, for example, is set to a pressure of about 300 kg / cm ² . The pressure reducing valve 4 reduces the pressure of the high-pressure gas from the pressure vessel 2 to a medium pressure, for example, about 7 to 8 kg / cm ² . The pressure vessel 2 and the pressure reducing valve 4 are connected to a supply pipe 12 that defines a supply flow path.
The supply flow path is provided with a container valve 14 for opening and closing the supply flow path. When the container valve 14 is opened, the respiratory gas from the pressure vessel 2 is supplied to the pressure reducing valve 4 through the supply flow path. However, when the container valve 8 is closed, the respiratory gas from the pressure vessel 2 is supplied. It is not fed to the pressure reducing valve 4. In the present embodiment, a part of the pressure reducing valve 4 constitutes a supply pipe 12 and defines a supply flow path. Pulmonary valve 6
The pressure of the medium pressure gas from the pressure reducing valve 4 is reduced to almost the atmospheric pressure, and is supplied to the face body 8. The pressure reducing valve 4 and the pulmonary valve 6
The respiratory gas from the pressure reducing valve 4 is supplied to the pulmonary valve 6 through the supply flow path, being connected via a supply pipe 16 defining a supply flow path. In addition, the pulmonary valve 6 and the face body 8 are connected via an air supply pipe 18 that defines an air supply flow path, and the breathing gas from the pulmonary force valve 6 is supplied to the face body 8 through the air supply flow path. Sucks the breathing gas supplied through the face body 8. The pulmonary valve 6 and its related elements will be described later. An exhalation valve 10 is provided on the face body 8. The exhalation valve 10 is opened when the wearer exhales, and discharges exhalation to the outside of the face body 8. The high-pressure breathing gas from the pressure reducing valve 4 is sent to the alarm device 11, and the alarm device 11 notifies that the remaining amount of the breathing gas is low when the pressure of the breathing gas falls below a predetermined value. In FIG. 2, a relatively high-pressure gas flows through a flow path (line) indicated by a solid arrow from the pressure vessel 2 to the pressure reducing valve 4, and a flow path indicated by a broken arrow from the pressure reducing valve 4 to the pulmonary valve 6. (line)
, A gas having a medium pressure flows, and a gas having a substantially atmospheric pressure flows through a flow path (line) indicated by a double arrow from the pulmonary valve 6 to the exhalation valve 10.

The pressure vessel 2 and the like are mounted on a mounting means 20, and the mounting means 20 and the face body 8 are mounted on a wearer as shown in FIG. Mainly referring to FIG. 1, the illustrated mounting means 20 has an elongated container mounting portion 22 having a size corresponding to the pressure container 2. This container mounting part 22
, The pressure vessel 2 is replaceably mounted so that the gas outlet faces downward, that is, the vessel valve 14 faces downward. A fastening band 2 is provided at an intermediate portion in the longitudinal direction of the container attaching portion 22.
The pressure vessel 2 is securely attached to the vessel attaching portion 22 by fastening the fastening band 24. A pair of shoulder bands 26 and 28 are connected to both vertical ends of the container mounting portion 22. One shoulder band 26 is disposed on the left side of the container mounting portion 22 in FIG. 1, and the left arm of the wearer is inserted therethrough. The other shoulder band 28 is disposed on the right side of the container mounting portion 22 in FIG. 1, and the right arm of the wearer is inserted therethrough. In the embodiment, the shoulder bands 26 and 28 are formed by the relatively wide first band portion 2.
6a, 28a and a relatively narrow second band portion 26
b, 28b, and the first band portions 26a, 28a
And the second band portions 26b and 28b are connected to each other. Then, when the wearer carries the wearing means 20, the first band portions 26a and 28a of the shoulder bands 26 and 28 are configured to hang on both shoulders of the wearer.

The first band portion 26 of one shoulder band 26
One chest band 30 extends from the connection between the first band 28a and the second band 26b, and the first band 28 of the other shoulder band 28.
The other chest band 32 extends from the connection between the second band 28a and the second band 28b. At the distal ends of the chest bands 30, 32, connecting fittings 34, 36 which are detachably connected to each other are provided. By connecting these connecting fittings 34, 36, the chest bands 30, 32 are attached. Is concluded in front of the person. In the embodiment, the pneumatic valve 6 is attached to one chest band 30. The pneumatic valve 6 has a housing 38,
An attachment 40 is provided on the rear surface of the housing 38. Referring also to FIG. 5, the attachment 40 is attached to the housing 38 by screwing an attachment screw (not shown) to the housing 38 through a hole 33 at the four corners. One chest band 30 is mounted through a pair of openings 35 and 37 provided in the attachment 40, and the lung valve 6 is mounted on the chest band 30 by being inserted through the opening. A suspension member 41 is attached to the chest band 30. The suspension member 41 has a loop-shaped mounting portion 42 at one end.
The other end has a substantially U-shaped locking portion 44, and the mounting portion 42 and the locking portion 44 are connected via a ring-shaped metal fitting 45, and the chest band 30 is attached to the mounting portion 42. It is attached to the chest band 30 by inserting. The face body 8 is detachably locked to the locking portion 44 of the suspension member 41 as described later. Since the pneumatic valve 6 and the suspension member 41 are attached to the chest band 30, when the pressure vessel 2 is carried on the back, the pneumatic valve 6 and the face body 8 to be attached to the head are in front of the left chest of the wearer. Will be retained. In consideration of the workability of the wearer, on the contrary to the above, the hanging member 4 is attached to the chest band 32.
1 can also be attached.

At the lower end of the container mounting portion 22 of the mounting means 20, waist bands 46, 48 extending on both sides are provided. At the distal ends of the waist bands 46, 48, connecting tools 50, 52 which are removably connected to each other are provided. By connecting these connecting tools 50, 52, the waist bands 46, 48 are attached. Fastened in front of the wearer's waist. As described above, in the mounting means 20 of the embodiment, the wearer uses the pair of shoulder bands 26, 28, the chest bands 30, 32, and the waist band 46 , 48. When the pressure vessel 2 is relatively light, the waist bands 46 and 48 may be omitted.

The face body 8 includes a mounting tool 54 disposed on the open face side. The mounting tool 54 has a plurality of (for example, six) connecting portions 56, and these connecting portions 56 are mounted on the face body 8. The wearing tool 54 is worn so as to wrap the head of the wearing person, and when worn as required, the face body 8 covers the face of the wearing person and the wearing tool 54 covers the head of the wearing person. A transparent eyepiece 60 is provided on the front surface of the face body 8 to secure a visual field. Further, the face body 8 is provided with a flexible barrier 62 integrally provided at a lower portion on the inner side thereof, and the barrier 62 covers the mouth and nose of the wearer. The barrier 62 defines a respiratory chamber inside the face body 8, and respiratory gas from the pulmonary valve 6 is supplied to a space defined by the face body 8 and the head of the wearer through an air supply passage.

FIG. 4 is an enlarged sectional view of the pneumatic valve 6. Referring mainly to FIG. 4, the illustrated pulmonary valve 6 includes a housing 38 described above and a lid 6 attached to the housing 38.
The housing 38 and the lid 64 are detachably mounted by mounting the ring 66 on the housing 38. The joint between the housing 38 and the lid 64 is covered with an annular cover 68 made of a flexible and elastic material such as rubber. The housing 38 and the lid 64 attached thereto define a diaphragm chamber 72 in which the diaphragm 70 is housed, and the periphery of the diaphragm 70 is sandwiched between the housing 38 and the lid 64, and the diaphragm chamber 70 is held by the diaphragm 70. Reference numeral 72 is partitioned into an atmospheric pressure chamber 74 communicating with the atmosphere and an intake pressure chamber 76 into which suction force is introduced. The suction pressure chamber 76 is connected to a supply-side connection portion 7 to which the feed pipe 16 is connected.
8 and a flow path 84 of a discharge-side connecting portion 82 to which the air supply pipe 18 is connected. When the diaphragm 70 is displaced to the intake pressure chamber 76 side by suction, the valve stem 86 Is displaced downward, the pulmonary force valve body 88 separates from the valve seat 90, the supply side flow path 80 communicates with the intake pressure chamber 76, and breathing gas flows in.
The air is supplied from the supply-side flow path 84 to the face body 8 through the air supply pipe 18. More specifically, the supply-side connection portion 78 is made of metal, and an external screw 90 for connecting the feed pipe 16 is engraved at the end on the upstream side in the supply direction of the breathing gas. An O-ring 9 is provided at the end of the connecting portion 78 on the downstream side in the supply direction.
2 is fitted. A groove 94 is formed in the vicinity of the O-ring 92 in the supply direction on the upstream side in the supply direction, and a pin (not shown) or the like is fitted therein so that the connection portion 78 is rotatably prevented from being pulled out. In addition, the supply pipe 16 can be formed from, for example, a rubber pipe.

The connecting portion 78 is connected to the housing 38.
Is connected to the mounting member 96 mounted on the mounting member. Mounting member 9
Reference numeral 6 is made of metal, and a flow path 98 communicating with the flow path 80 of the connection portion 78 is formed. An internal thread is engraved on the inner peripheral surface of the downstream end of the flow path 98 in the supply direction, and the valve seat 90 is integrally formed with the internal screw, and an external thread is engraved on the outer peripheral surface. The screw member 100 is screwed. An O-ring 102 is fitted around the outer periphery of the screw member 100 to prevent leakage of breathing gas from a gap between the inner screw of the mounting member 96 and the outer screw of the screw member 100. Thus, the valve body 88 and the valve seat 90 are detachably mounted on the mounting member 96 by the screw member 100.

The mounting member 96 is integrally formed with a rising portion 104 which rises in a direction perpendicular to this member (substantially the vertical direction in FIG. 4). The rising portion 104 has a valve hole 106 communicating with the flow path 80. A valve body 108 which is a pressure regulating valve for opening / closing the valve is provided, and the valve body 108 is housed in a valve chamber 110. A valve rod 112 on which the valve element 108 is mounted is fitted into the valve chamber 110, and an operation piece 114 made of synthetic resin is fixed to a distal end portion thereof by a pin. By performing angular displacement operation of the operation piece 114, the valve rod 112 is advanced / retracted, and the valve element 108 can close or open the valve hole 106.

An O-ring 115 is mounted on the valve stem 112, so that an airtight space is formed in the valve chamber 110. This space communicates with the flow path 98 when the valve element 108 moves away from the valve hole 106. Such a space communicates with the intake pressure chamber 76 via the bypass holes 116 and 118. Therefore, even when the valve body 88 is closed, if the operation piece 114 is operated to open the valve body 108,
The breathing gas supplied to the flow paths 80 and 98 passes through the valve hole 106 and the bypass holes 116 and 118,
And the respiratory gas can be supplied into the face body 8 at a constant flow rate regardless of the suction or exhaust of the wearer. As a result, even if the suction becomes impossible due to the suction due to the failure of the valve body 88 or the like, the breathing gas can be guided into the face body 8 and breathed.

One end of a valve rod 86 projecting into the intake pressure chamber 76 is fixed to the valve body 88. The valve stem 86 is supported by the conical spring 120 so that the valve body 88 is in contact with the valve seat 90 over the entire circumference in the circumferential direction. The valve stem 86 is angularly displaced against the spring force of the conical spring 120. The valve body 88 separates from the valve seat 90 and opens, and the flow path 8
The respiratory gas in 0,98 passes through the valve hole 122 and the inspiratory pressure chamber 7
It flows into 6. A substantially spherical contact piece 86a is fixed to the other end of the valve stem 86, and the contact piece 86a lightly contacts the diaphragm 70 from the intake pressure chamber 76 side. The valve stem 86 is connected to the guide plate 1 fixed to the housing 38.
4 is guided in the vertical direction in FIG. The diaphragm 70 has a flexible film 128 made of a flexible and elastic material such as rubber, for example, and a metal holding plate 130 to which the flexible film 128 is pressed. A pair of support pieces 132 (only one is shown in FIG. 4) are erected on the holding plate 130, and a connection piece 134 is fixed to an upper end thereof. Each support piece 13
When the diaphragm 70 is displaced toward the atmospheric pressure chamber 74 by 2, the diaphragm 70 comes into contact with the lid 64 and the displacement of the diaphragm 70 toward the atmospheric pressure chamber 74 is held at the top dead center.

The cover 64 is provided with a swinging member 138 that can swing in the atmospheric pressure chamber 74. This swing member 13
8 is provided with an inverted U-shaped display piece 140 colored, for example, in red, through a display hole 142 formed in the lid 64 when the swinging member 138 rises counterclockwise. The display piece 140 can be visually recognized from the outside. In the state where the red color of the display piece 140 is displayed from the display hole 142 in this manner, the swinging member 138 pushes the connecting piece 134 upward from below in FIG. 4 and the diaphragm 70 is displaced toward the atmospheric pressure chamber 74. Thus, the lock state is established in which the displacement to the intake pressure chamber 76 side is prevented. In this locked state, the valve body 88 is moved by the action of the spring 120 to the valve seat 9.
0, and the valve hole 122 is kept closed by the valve body 88.

At one end in the longitudinal direction of the swinging member 138, a contact piece 144 made of a slippery material such as, for example, a synthetic resin and having a contact surface facing the diaphragm 70 and forming a part of a spherical surface is formed. Is fitted. Swing member 138
Is locked with one end of a spring 146, and is biased clockwise or counterclockwise. The other end of the spring 146 is locked by an adjusting screw 148 screwed to the lid 64, and the spring force of the spring 146 is adjusted by screwing the adjusting screw 148 forward and backward. can do.

The tip 150 of the swinging member 138 holds the locking spring 152 when the swinging member 138 rises in the counterclockwise direction.
Locked by. This locked state can be released by the displacement of the diaphragm 70 from the atmospheric pressure chamber 74 toward the intake pressure chamber 76 by suction. The locking spring 152
The coil spring is bent into a U-shape, and both ends thereof are
Is attached to the projection 154 integrally formed with the holding plate 156 and the bolt 158. This locking spring 152
Is easily bent upward in FIG.
5 is locked, and the locked state is released downward by a force greater than the upward displacement.

At the other end in the longitudinal direction of the swinging member 138, there is formed a guide part 158 which rises substantially at a right angle from the other end and extends to the left as it goes upward in FIG. The guide portion 158 has a conical wedge surface 160a of a pressing piece 160 which is detachably attached to the decorative cover 136 and made of a flexible and resilient material such as rubber.
Pressed by. The guide 158 is provided on the swinging member 1.
The pressing piece 160 is curved and extends directly below the wedge surface 160a on the opposite side of the one end from the pivoting piece 162 that pivotally supports the pressing piece 160.
Presses the guide 158 to the side, that is, to the left in FIG. With such a wedge surface 160a and the guide portion 158, the swinging member 138 can be raised counterclockwise with a small force and locked to the locking spring 152.

The pneumatic valve 6 is configured as follows. Referring to FIGS. 1, 3 and 4, supply-side connection portion 78 and discharge-side connection portion 82 of pulmonary valve 6 are attached to a wearer (this attached state is as shown in FIG. 3). , And the pressure vessel 2 is in a normal upright posture with the backrest as required). The delivery tube 16 extends downwardly over the upper side of the wearer's shoulder, is connected to the supply connection 78 of the pneumatic valve 6, and has one end of the supply tube 18 in a substantially horizontal position. It is connected to the outlet connection 82 of the valve 6. In particular, the air supply pipe 18
Is connected to the discharge side connection portion 82 in a substantially horizontal state, so that water flows in from the open surface of the face body 8 and flows toward the pulmonary valve 6 through the air supply pipe 18. Thus, the invasion of the pulmonary valve 6 into the intake pressure chamber 76 due to the weight of the water that has flowed in at one end of the air supply pipe 18 is reduced. In order to more effectively prevent the intrusion of water in connection with the connection structure of the air supply pipe 18, it is only necessary to surely prevent the water from flowing down by its own weight. It is preferable to provide it so as to extend downward. With such a configuration, one end of the air supply pipe 18 is connected to the discharge-side connection portion 82 of the pulmonary valve 6 from the lower side to the upper side in a state of being attached to the wearer, and Of the lung force valve 6 into the intake pressure chamber 82 is more reliably prevented.

In connection with the fact that the discharge-side connection portion 82 of the pulmonary valve 6 extends substantially horizontally (or below), the following characteristics arise. That is, the face body 8
Is mounted on the head of the wearer, and the air supply pipe 18 extends substantially vertically downward from the other end connected to the lower part of the face body 8.
On the other hand, in the present embodiment, the pulmonary valve 6 is
And is disposed in front of the wearer's left chest (FIG. 3), and one end of the air supply pipe 18 is substantially horizontally (or upward from below) on the discharge side of the pneumatic valve 6. Connection part 82
Connected to. Thus, as will be readily appreciated, by connecting the air supply line 18 to the facepiece 8 and the pulmonary valve 6 in this manner, the air supply line 18 is substantially angled at 90 degrees or more (or more than 90 degrees). (See FIGS. 1 and 3). Therefore, even if water enters the air supply pipe 18 through the face body 8, the water that has entered does not flow down at the curved portion of the air supply tube 18, is retained at this curved portion, and is supplied to the intake pressure chamber 76 of the pneumatic valve 6. Intrusion is reliably prevented. As understood from the above description, the pulmonary valve 6
Is configured to extend substantially below the horizontal, or the discharge side connection 82 of the pulmonary valve 6
Is extended substantially horizontally, and the length of the air supply pipe 18 is increased to make the air supply pipe 16 bend relatively large, so that the bending angle α ( In FIG. 1), the angle exceeds 90 degrees, so that this curved portion effectively acts as a reservoir for the invading water, and the invasion of the pulmonary valve 6 of the invading water to the suction pressure chamber 76 is reliably prevented. Is done.

In order to prevent the water that has entered from the face body 8 from flowing down to the pulmonary valve 6, it is desirable that the air supply pipe 18 be formed of a serpentine pipe as shown in FIG. In this embodiment, the entire air supply pipe 18 is formed of a serpentine pipe, and one end of the air supply pipe 18 is connected to the discharge-side connecting portion 82 by a fastener 170 as shown in FIG.
Attached to the outer peripheral surface of The coiled tube has a ring-shaped crest formed continuously over substantially the entire length in the longitudinal direction. By configuring the air supply pipe 18 as a serpentine pipe, the surface area of the inner peripheral surface of the air supply pipe 18 is increased, and therefore, the amount of water that can adhere to the internal surface of the air supply pipe 18 is increased, and the pneumatic valve of the intruded water is increased. 6 is prevented. In addition, air supply pipe 18
In the curved portion, the groove (recess formed on the inner surface corresponding to the peak of the flexible pipe) acts as a water reservoir, and water flowing down along the inner surface of the air supply pipe 18 is collected in the groove.
Further flow toward the pulmonary valve 6 is prevented. In addition, by forming the air supply pipe 18 from a serpentine pipe, the air supply pipe 18 itself can have sufficient flexibility, and the workability of the wearer is also improved. In the present embodiment, the entire air supply pipe 18 is formed of a flexible pipe. However, the above-described operation and effect can be achieved by configuring a part of the supply pipe 18 (for example, a curved portion and its vicinity) with a flexible pipe. .

The above-described configuration is to prevent the water that has entered from the face body 8 from flowing down to the pneumatic valve 6. Even if the water enters the intake pressure chamber 76 of the pneumatic valve 6, With such a configuration, it is possible to prevent the pulmonary valve element 88 from freezing. In the present embodiment, when the pulmonary valve 6 is attached to the chest band 30, the supply-side connection portion 78 and the discharge-side connection portion 82 of the pulmonary valve 6 are connected to the housing 38.
In this regard, the pulmonary valve body 88 and the valve seat 90 are also disposed in the housing 38 at a substantially central portion in the vertical direction. Therefore, as understood from FIG. 4, there is a relatively large space below the location of the valve body 88 and the valve seat 90 in the intake pressure chamber 76 of the pneumatic valve 6, and this space functions as a water reservoir. I do.
Therefore, even if water invades into the intake pressure chamber 76 of the pulmonary power valve 6 through the face body 8 and the air supply pipe 18, the invaded water accumulates in a lower space of the intake pressure chamber 76, that is, a space functioning as a water reservoir, The valve body 88 and the valve seat 90 are hardly affected by water, and the operation of the valve body 88 is hardly affected even if water freezes in the intake pressure chamber 76.

When the face piece 8 is not worn on the wearer's head, it is held as shown in FIG. Referring to FIGS. 1 and 5, a suspending member 41 is attached to the chest band 30 of the attaching means 20, and the locking portion 44 of the suspending member 41 is formed of a somewhat elastically deformable metal plate. And is open upward. On the other hand, a mounting member 174 is mounted by a mounting belt 175 near the lower end of the face body 8 in a state where the face body 8 is worn on the wearer's head, in other words, near the connection between the face body 8 and the air supply pipe 18. Fixture 17
4 has a mounting portion 174 a having a substantially rectangular insertion opening, and the free end of the locking portion 144 of the hanging member 41 is inserted through the insertion opening to thereby mount the mounting fixture 1.
74 is attached to the suspension member 41. In this mounting state, the connecting portion between the face body 8 and the air supply pipe 18 (the lower end in the state of being attached to the wearer's head) is located on the upper side, so that water falling from above due to water discharge or the like is not placed on the face body 8. Even if water enters from the open surface of the face body 8 (the contact opening attached to the face of the wearer), the intruded water does not flow to the air supply pipe 18 side. It flows down along the inner surface of the face body 8 and the upper side of the face body 8 (since the face body 8 is held upside down in the suspended state, the upper side is lower in the suspended state. Located) and no water enters and flows through the air supply line 18 toward the pulmonary valve 6. Also, in this suspended state, by positioning the open face of the face body 8 on the chest side of the wearer, the open face is covered by the body of the wearer, and the face body 8 is placed from the outside. Water can be prevented from entering the water.

[0029]

According to the invention, the pulmonary valve housing is mounted on the chest band of the mounting means, in which mounting the outlet connection of the pneumatic valve extends substantially horizontally or below. ing. Therefore, even if water invades from the open surface of the face body, the invading water hardly reaches the pulmonary valve and is held in the air supply flow path. Therefore, the water that causes freezing is prevented from flowing to the pneumatic valve, and freezing in the pneumatic valve is effectively prevented. In addition, since the air supply pipe has at least a part of a serpentine pipe portion in which a plurality of ring-shaped wave peaks are provided in the longitudinal direction, water flowing from the face body and flowing through the air supply pipe is held by the serpentine tube part. ,
It is prevented from flowing further downstream toward the pulmonary valve.

Further, according to the present invention, since a water reservoir located below the valve seat is provided in the intake pressure chamber of the housing in the pulmonary power valve, it is assumed that external water is supposed to flow from the face body through the air supply pipe. Even if it invades the force valve, the invading water accumulates in the water reservoir of the intake pressure chamber and is prevented from reaching the valve body.

Further, according to the present invention, since the air supply pipe is formed of a serpentine pipe, even if water enters from the open surface of the facepiece, the invading water is directed toward the pulmonary valve by the wave peak of the serpentine pipe. Flow is prevented. In addition, since the serpentine tube has a curved portion that is bent substantially 90 degrees or more from the face body to the lung power valve, the flow of water from the face body to the lung power valve is further increased by the presence of the curved portion. Effectively prevented.

Further, according to the present invention, when the attachment of the face body is attached to the suspension member of the chest band, the connection portion between the face body and the air supply pipe is located on the upper side, so that the air supply pipe extending from the face body toward the pulmonary valve. Has an end extending upward from the open end of the face body, thereby preventing water from entering the air supply pipe from the open face of the face body.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an open respirator according to the present invention.

FIG. 2 is a simplified system diagram of the respirator of FIG.

FIG. 3 is a perspective view showing a state in which the wearer wears the respirator of FIG. 1;

FIG. 4 is a sectional view showing a pulmonary valve in the respirator of FIG. 1;

5 is a partial perspective view showing a state in which the face body in the respirator of FIG. 1 is suspended by a suspension member.

[Explanation of symbols]

 Reference Signs List 2 pressure vessel 4 pressure reducing valve 6 pulmonary valve 8 facepiece 10 exhalation valve 12 supply pipe 16 supply pipe 18 supply pipe (serpentine pipe) 20 mounting means 22 container mounting part 26, 28 shoulder band 30, 32 chest band 38 housing 41 hanging Member 70 Diaphragm 74 Atmospheric pressure chamber 76 Intake pressure chamber 78 Supply side connection part 82 Discharge side connection part 88 Pulmonary valve element 90 Valve seat 174 Fixture

Claims (4)

[Claims] 1. A pressure vessel filled with breathing gas, a pressure reducing valve for reducing the pressure of breathing gas from the pressure vessel, a pulmonary valve which opens and closes in response to breathing, a face plate, the pressure vessel, and the pressure vessel. A supply flow path connecting the pressure reducing valve, a supply flow path connecting the pressure reducing valve to the lung power valve, an air supply flow path connecting the lung power valve to the face body, and the pressure vessel are mounted. Mounting means for mounting the pressure vessel, a pair of shoulder bands connected to the container mounting section, and a pair of shoulder bands for connecting the pair of shoulder bands. A chest band, the pneumatic valve, a housing, a supply-side connection portion and a discharge-side connection portion provided in the housing, a pneumatic valve body and a valve seat disposed in the housing, The supply-side connection portion is communicated with the supply flow path, and A continuation part is communicated with the air supply flow path, and the breathing gas from the pressure reducing valve is supplied to the face body when the pulmonary valve is separated from the valve seat. Means for attaching to the chest band of the means, wherein the outlet connection of the pneumatic valve extends substantially horizontally or below when attached to the chest band; The open-type respirator, wherein the trachea has at least a part of a serpentine tube portion provided with a plurality of ring-shaped wave peaks in a longitudinal direction thereof. 2. The housing of the pneumatic valve is partitioned by a diaphragm into an atmospheric pressure chamber that communicates with the atmosphere and an intake pressure chamber that communicates with the face body.
The open-type respirator according to claim 1, further comprising a water reservoir located below the valve seat in a state of being attached to the chest band. 3. The air supply pipe comprises a coiled pipe having a ring-shaped wave peak provided over substantially the entire length thereof in the longitudinal direction, and the coiled pipe is provided with the pneumatic valve mounted on the chest band. Substantially 90 from the facepiece to the lung power valve
The open-type respirator according to claim 1 or 2, wherein the open-type respirator has a curved portion that bends more than once. 4. A hanging member is provided on the mounting means, and a mounting member is provided on the face body so as to be hung by the hanging member. When the mounting member is mounted on the hanging member, The open-type respirator according to any one of claims 1 to 3, wherein a connection portion between the face body and the air supply pipe is located on an upper side.