JP2521543Y2 - Constant flow valve for intake gas supply - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a constant flow valve for inhalation gas supply for supplying a constant amount of inhalation gas such as air and oxygen to a living body, mainly a human body. For example, it can be used as an air inhaler used in a fire scene, an oxygen inhaler used in the medical field, and a diving device used in scuba diving.

[Background technology]

Generally, an air inhaler, an oxygen inhaler, a submersible, etc., have a high-pressure gas cylinder filled with a high-pressure inhalation gas such as air or oxygen, an inhalation mask, and a high-pressure inhalation gas in the high-pressure gas cylinder, which is decompressed at a constant flow rate. It consists of a constant flow valve that supplies to the inhalation mask.

For example, an air inhaler used in a fire scene includes a high-pressure gas cylinder filled with high-pressure intake air (maximum pressure 300 kgf / cm ² ), an intake mask, and the high-pressure intake air in the high-pressure gas cylinder, which is decompressed at a constant flow rate. It consists of a constant flow valve that supplies to the inhalation mask. The high pressure gas cylinder is
It is designed so that you can carry it on your back through your backpack.

Conventionally, a constant flow valve for supplying suction gas, which is attached to this type of gas inhaler, has an opening / closing valve attached to one end of a high-pressure gas cylinder filled with high-pressure suction gas, and the opening / closing valve is connected to the inside of the high-pressure gas cylinder via a hose. The pressure gauge for displaying the suction gas pressure and the pressure reducing valve for supplying the suction gas to the suction device at a constant flow rate are connected to each other.

The on-off valve, pressure gauge, and pressure reducing valve are made of copper alloy as a material that can withstand this pressure because the pressure of the high-pressure suction gas filled in the high-pressure gas cylinder is up to 300 kgf / cm ² . .

[Problems to be solved by the device]

By the way, this type of gas inhaler is required to be smaller and lighter in terms of portability and transportation. In particular, an air inhaler used at a fire site must be evacuated or extinguished while carrying it on its back, so it is an important issue to reduce the weight by even a few percent, and at the same time, it must be small in size. It is an important issue to realize it.

Regarding high-pressure gas cylinders, in order to meet the demand for lighter weight, made from FRP composite (composite material) in which epoxy resin-impregnated high-strength glass fiber is wrapped over an aluminum seamless liner in place of conventional steel containers for several years. Containers are being used rapidly.

However, the constant flow rate valve for supplying the suction gas is heavy and cannot meet the demand for weight reduction because it is a conventional copper alloy. Further, since the opening / closing valve attached to the high-pressure gas cylinder, the pressure gauge, and the pressure reducing valve are separately configured and connected to each other through the hose, a large space is required and the size can be reduced. It is an obstacle.

This not only impairs fire extinguishing work such as firefighters who perform fire extinguishing work, but it is difficult and quick to blame as a gas inhaler used by ordinary people other than these trained people, and it is not safe. In terms of, there are still problems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a constant flow valve for intake gas supply which solves the above-mentioned conventional problems, can be made smaller and lighter, and can also ensure safety.

[Means for solving the problem]

Therefore, in the present invention, a constant flow valve for suction gas supply for reducing the pressure of the high pressure suction gas housed in the high pressure gas cylinder and supplying it at a constant flow rate, and an opening / closing valve attached to one end of the high pressure gas cylinder is provided. A pressure gauge that is installed on the inlet side of the on-off valve and displays the suction gas pressure in the high-pressure gas cylinder, and a pressure reducing valve that is installed on the outlet side of the on-off valve to decompress the intake gas and release it at a constant flow rate. And at least main components of the opening / closing valve and the pressure reducing valve are formed of an aluminum alloy, and the opening / closing valve, the pressure gauge, and the pressure reducing valve are arranged so as to fit within the outer diameter of the high-pressure gas cylinder. And

[Action]

Since the high-pressure suction gas stored in the high-pressure gas cylinder is introduced to the inlet side of the open / close valve, the pressure gauge indicates the high-pressure suction gas pressure in the high-pressure gas cylinder.
Here, when the opening / closing valve is opened, the high-pressure suction gas in the high-pressure gas cylinder is introduced into the decompression valve through the opening / closing valve, where it is decompressed and then discharged at a constant flow rate.

Here, since the pressure gauge and the pressure reducing valve are directly attached to the open / close valve, that is, the pressure gauge and the pressure reducing valve are collectively arranged at one place, the size can be reduced. At the same time, since the main components of the on-off valve and the pressure reducing valve are made of aluminum alloy, the weight can be reduced. Moreover, since the on-off valve, pressure gauge, and pressure reducing valve are arranged so that they fit within the outer diameter of the high-pressure gas cylinder, the pressure or flow rate of the intake gas discharged from these parts may collide during fire extinguishing work. Safety can be ensured because it can be prevented.

〔Example〕

Hereinafter, an embodiment in which the constant flow valve of the present invention is applied to an intake inhaler used in a fire scene will be described with reference to the drawings.

FIG. 5 shows a usage state of the air enclosure of the present embodiment. The air inhaler has a high-pressure gas cylinder 1 containing high-pressure intake air (maximum pressure 300 kgf / cm ² ) which is high-pressure intake gas, and a constant flow valve 2 attached to one end discharge port 1A of the high-pressure gas cylinder 1. , A helmet 4 connected to the constant flow valve 2 via a hose 3.

Therefore, when the constant flow valve 2 is opened in a state where the high pressure gas cylinder 1 is carried on the back via the backpack 5 and the helmet 4 is covered from the head, the high pressure intake air in the high pressure gas cylinder 1 is supplied to the constant flow valve 2 and the hose. Since it is purged into the helmet 4 via 3, it is possible to safely evacuate or extinguish fire.

Now, as shown in FIG. 1, the constant flow valve 2 of the present embodiment is
An opening / closing valve 11 attached to the one-end discharge port 1A of the high-pressure gas cylinder 1, a pressure gauge 31 attached to the inlet side of the opening / closing valve 11 for displaying the high-pressure intake air pressure in the high-pressure gas cylinder 1, and the opening / closing valve 11 It is composed of a pressure reducing valve 41 attached to the outlet side for reducing the pressure of the high pressure intake air to about 2 kgf / cm ² and discharging it at a constant flow rate, and a flow rate switching valve 71 for switching the flow rate of the intake air discharged from the pressure reducing valve 41. ing.

The opening / closing valve 11 includes a main body 12. In the main body 12,
A mounting screw portion 13 for mounting the high pressure gas cylinder 1 on one end side, and a mounting screw portion for mounting the pressure reducing valve 41 on the other end side.
14 are formed respectively. Gas passages 16A and 16B having valve seats 15 are formed midway from the center of the mounting screw portion 13 toward the center of the mounting screw portion 14. Gas flow path 1
Between the 6A and 16B, the valve body housing holes 1 arranged at right angles to each other
7. A pressure gauge mounting hole 18 and a safety device mounting hole 19 are formed at right angles to the gas passage 16A. 20 is an O-ring.

A valve body 21 that opens and closes the valve seat 15 is screwed into the valve body housing hole 17 so as to be movable back and forth, and a rotating handle mechanism 24 that is moved forward and backward while rotating the valve body 21 is screwed together. . The valve body 21 has a packing 22 that comes into contact with and separates from the valve seat 15 on the tip end surface, and has a groove 23 on the outer end surface.
The turning handle mechanism 24 is held rotatably in the central axis direction of the holding screw 25 screwed into the valve body accommodating hole 17, and engages with the groove 23 at the tip end surface. Protruding piece 26
And a handle 30 fixed to an outer male screw portion 28 of the rotary shaft 27 via a nut 29.

As shown in FIG. 2, the pressure gauge mounting hole 18 is provided with the pressure gauge.
31 is installed. Further, a rupture plate 34 is accommodated in the safety device mounting hole 19 through a cap screw 33 having a fusible alloy 32 accommodated in the center hole. The fusible alloy 32 has a temperature of 105
It is composed of low-temperature solder that melts at ± 5 ° C. The rupture plate 34 has a high pressure intake air pressure in the gas flow passage 16A, that is, a high pressure intake air pressure in the high pressure gas cylinder 1 is 35
When it reaches 0 ± 50 kgf / cm ² , it bursts and serves to release the high-pressure intake air in the high-pressure gas cylinder 1 to the outside. Reference numeral 35 is a cap that covers these outsides.

The main components of the components of the on-off valve 11 described above, here, the main body 12, the valve body 21, the cap screw 25,
The rotating shaft 27 and the cap 35 are made of aluminum alloy.

Next, the pressure reducing valve 41 has a mounting screw portion of the main body 12.
Nipple 43 attached to 14 via cap nut 42,
A cylinder 45 attached to the nipple 43 via a body 44 is provided. A gas passage 46 is formed in the central axis direction of the nipple 43 so as to communicate with the gas passage 16B of the main body 12 and to have a throttle in the middle. A net 47 is attached to one end side of the gas flow path 46, and a valve seat body 48 is accommodated in the other end side.

As shown in FIG. 3, the valve seat body 48 has a slit on the outer peripheral surface.
Seats 50 are provided on the front end surface of the valve 49, and a valve hole 51 communicating with the gas flow path 46 is formed at the center. The valve hole 51 accommodates a needle valve 52 having a tapered diameter toward the tip. The needle valve 52 has a tip protruding downward from an opening 53 formed in the body 44, and is constantly biased by a spring 54 in a direction of closing the valve hole 51.

Inside the cylinder 45, a piston 55 is slidably housed and a pressure adjusting screw 56 is screwed. A nozzle 58 for connecting one end of the hose 3 is attached to an inner wall of a cylinder chamber 57 partitioned by a piston 55, the gas passage 58A extending along the central axis direction. At the center position of the piston 55, a guide shaft 60 having a protrusion 59 at the tip for contacting the needle valve 52 is held by a nut 61. A holding hole 62 for slidably holding the lower portion of the guide shaft 60 is formed at the center position of the pressure adjusting screw 56, and an escape hole 63 is provided at a predetermined peripheral angular position.
Are formed. A spring 64 is housed between the pressure adjusting screw 56 and the piston 55. 65 is an escape hole, and 66 is a bleed hole.

The main components of the components of the pressure reducing valve 41 described above, here, the cap nut 42, the nipple 43, the body 44, the cylinder 45, the valve seat body 48, the piston 55, the pressure adjusting screw 56, the nozzle 58 and the guide. The shaft 60 is made of an aluminum alloy.

Next, as shown in FIG. 4, the flow rate switching valve 71 is formed with a throttle channel 72 formed in the middle of the gas channel 58A of the nozzle 58 and an annular shape on the outer peripheral wall of the throttle channel 72. Formed annular groove 73, and an aluminum ring 74 rotatably provided on the outer peripheral surface of the nozzle 58 so as to close the annular groove 73.
And the gas channel 58A with the throttle channel 72 sandwiched between the annular groove 7
It is composed of two holes 75, 76 communicating with 3, and a semi-annular spool 78 rotatably housed in the annular groove 73 in association with the ring 74 via a bolt 77.

 Next, the operation of this embodiment will be described.

At the time of assembly, a constant flow valve 2 including an opening / closing valve 11, a pressure gauge 31, a pressure reducing valve 41 and a flow rate switching valve 71.
The mounting screw portion 13 is attached to the discharge port 1A of the high-pressure gas cylinder 1, and the helmet 4 is connected to the nozzle 58 via the hose 3. At this time, the constant flow valve 2 is arranged so as to fit within the outer diameter dimension of the high pressure gas cylinder 1, so that, for example, as shown in FIG. Can be covered with these rods 6 if they are projected. Therefore, during the fire extinguishing work, it is possible to prevent fluctuations in the pressure and flow rate of the intake air due to these collisions.

Now, the high-pressure intake air stored in the high-pressure gas cylinder 1 is fed from the gas passage 16A of the opening / closing valve 11 to the pressure gauge mounting hole 18
Through the safety device mounting hole 19 and into the rupture plate 34, respectively. Therefore, the pressure gauge 31
Indicates the high-pressure intake air pressure stored in the high-pressure gas cylinder 1, and at the same time, when the high-pressure intake air pressure stored in the high-pressure gas cylinder 1 exceeds the permissible pressure defined by the rupture plate 34, a rupture occurs. Safety is ensured because the plate 34 bursts and the high-pressure intake air contained in the high-pressure gas cylinder 1 escapes to the outside. In addition, the fusible alloy 32 ensures safety against high temperatures.

Here, when the handle 30 is rotated in the opening direction, the valve body 21 engaged with the protruding piece 26 of the rotation shaft 27 is rotated and retracts in the direction away from the valve seat 15, so that the valve is removed from the valve seat 15. The packing 22 of the body 21 is separated and the valve seat 15 is opened. Then, the high pressure intake air is
Net 47, gas passage 46, valve hole 51 of valve seat 48, and needle valve
It flows into the cylinder chamber 57 through the gap with 52.

At this time, the pressure in the cylinder chamber 57 and the repulsive force of the spring 64 acting on the piston 55 are balanced at ² kgf / cm ² , and the valve seat body
Since the gap between the valve hole 51 of the valve 48 and the needle valve 52 is controlled, the pressure in the cylinder chamber 57 is kept constant.
Here, if the pressure in the cylinder chamber 57 exceeds 2 kgf / cm ² and reaches, for example, 3 to 3.5 kgf / cm ² , the piston 55 causes the spring 64 to move.
Since the air in the cylinder chamber 57 is bleed to the outside from the bleed hole 66,
Safety is secured.

Subsequently, the intake air in the cylinder chamber 57 flows through the throttle passage 72 of the flow rate switching valve 71 to the gas passage 58A of the nozzle 58. At this time, when the spool 78 is rotated in association with the rotation operation of the ring 74 to a position where it is disengaged from the two holes 75, 76, the throttle channel 72 is passed through the two holes 75, 76 and the annular groove 73.
Since a flow path different from the above is configured, the flow rate of intake air can be switched. In this case, 20 l /
min, when the flow path by the holes 75, 76 and the annular groove 73 is opened, it is switched to 30 l / min.

Then, the intake air discharged from the gas flow path 58A of the nozzle 58 is purged into the helmet 4 through the hose 3. Therefore, it is possible to safely evacuate or extinguish the fire.

Therefore, according to the present embodiment, the opening / closing valve 11 has a pressure gauge 31
And since the pressure reducing valve 41 is directly attached,
In other words, since it is arranged in one place in a centralized manner, it is possible to achieve miniaturization as compared with the conventional connection using a hose.

Further, the main components of the opening / closing valve 11 and the pressure reducing valve 41, specifically, the main body among the components forming the opening / closing valve 11.
12, valve body 21, cap screw 25, rotating shaft 27 and cap 35
In addition, the nipple
43, the body 44, the cylinder 45, the valve seat body 48, the piston 55, the pressure adjusting screw 56, the nozzle 58, and the guide shaft 60 are each formed of an aluminum alloy, so that the weight can be reduced. At that time, if the surface of these aluminum alloys is subjected to a tough brown coating, it is possible to eliminate the feeling of lightness and thinness that is received from the surface of the aluminum alloy, to give a high-grade and solid feeling, and at the same time to increase the surface hardness.

Further, since the opening / closing valve 11, the pressure gauge 31, and the pressure reducing valve 41 are configured to be contained within the outer diameter of the high pressure gas cylinder 1, the suction gas pressure or flow rate released when these parts collide during work may fluctuate. Safety can be ensured because it can be prevented. Moreover, as shown in FIG. 5, if it is surrounded by a plurality of rods 6, higher safety can be secured.

In the above-mentioned embodiment, the flow rate switching valve 71 is provided so that the flow rate can be switched between two stages, that is, two stages of 20 l / min and 30 l / min. The above may be switched. In this case, the flow rate is not limited to 20 l / min and 30 l / min.

Further, in the above embodiment, the hose 3 is directly connected to the nozzle 58, but the hose 3 may be connected via a one-touch coupler, for example. In this way, the helmet 4 can be attached / detached with one touch. In that case, if you use a one-touch coupler with a built-in automatic opening / closing valve mechanism, the helmet 4
It is possible to automatically cut off the release of gas when the portion of is released.

Further, in the above embodiment, the example applied to the air inhaler used in the fire scene was explained, but the present invention is not limited to this, and in addition to this, it can be applied to oxygen inhalers and scuba diving used in the medical field. It can also be applied to the diving equipment used.

[Effect of device]

As described above, according to the present invention, it is possible to provide a constant flow valve for intake gas supply that is small in size and light in weight and secures safety at the same time.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a sectional view showing a constant flow valve, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG.
The figure is an enlarged sectional view of a portion of FIG. 1, and FIG.
IV-IV line sectional drawing, FIG. 5 is a figure which shows a use condition. 1 ... High pressure gas cylinder, 2 ... Constant flow valve, 11 ... Open / close valve,
31 ... Pressure gauge, 41 ... Pressure reducing valve.

Claims (1)

(57) [Scope of utility model registration request] 1. A constant flow valve for suction gas supply for reducing the pressure of a high pressure suction gas housed in a high pressure gas cylinder and supplying it at a constant flow rate, comprising an opening / closing valve attached to one end of the high pressure gas cylinder. A pressure gauge attached to the inlet side of the on-off valve for displaying the suction gas pressure in the high-pressure gas cylinder,
A pressure reducing valve attached to the outlet side of the opening / closing valve to reduce the pressure of the intake gas and release the intake gas at a constant flow rate, at least the main components of the opening / closing valve and the pressure reducing valve are formed of an aluminum alloy, and the opening / closing valve is A constant flow valve for suction gas supply, characterized in that a pressure gauge and a pressure reducing valve are arranged so as to fit within the outer diameter of the high-pressure gas cylinder.