JPS5845711Y2 - Opening device for carbon dioxide absorption canister in circulation type respirator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for releasing a carbon dioxide absorption line provided in a circulation type respirator.

In the typical prior art, a thin copper sealing plate is soldered to the connection port of the carbon dioxide absorption line to seal the inside of the can.

When in use, first open the protective cover that covers the carbon dioxide absorption line and other components of the respiratory system, then use a cutter with an obtuse angle to break the sealing plate, and then connect the connection port to the respiratory circulation circuit. Connecting.

In such prior art, multiple manual operations are required to break the seal of the carbon dioxide absorption line, which is cumbersome during emergency fire extinguishing operations and is prone to erroneous operations.

Furthermore, if the sealing plate is not completely broken, breathing resistance is large and breathing becomes difficult.

Furthermore, the sealing plate must be soldered to the connection port of the carbon dioxide absorption line every time the carbon dioxide absorbent is refilled, resulting in poor productivity.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and its main purpose is to provide an improved carbon dioxide absorption line opening device with excellent operability.

FIG. 1 is a system diagram of an embodiment of the present invention.

This closed circulation respirator consists of 1 mask and 2 carbon dioxide absorption lines.
are connected by an exhalation pipe 3, the carbon dioxide absorption line 2 and the breathing bag 4 are connected by a conduit 5, and the breathing bag 4 is connected to the mask 1 via an inhalation pipe 6, thereby forming a respiratory circulation circuit 7. .

An exhaust valve 8 is connected to the breathing bag 4 to release gas into the atmosphere when the pressure within the circuit 7 rises abnormally.

A constant flow of oxygen is supplied to the respiratory circulation circuit 7 from a gas source 9 .

In the gas source 9, high-pressure oxygen from an oxygen cylinder 10 is guided from a manual blocking valve 11 to a pressure reducing valve 12 to reduce its pressure, and the reduced pressure oxygen is supplied to the respiratory circulation circuit 7 via a metered supply throttle 13. be done.

When the pressure within the respiratory circulation circuit 7 drops abnormally, the automatic replenishment valve 14 opens and oxygen is supplied to the circuit 7.

According to the present invention, when using the subject respirator, the blocking valve 11
When opened, the opening device 15 opens the carbon dioxide absorption line 2 by the pressure of oxygen led from the oxygen cylinder 10 via the blocking valve 11 and the conduit 55, so that the carbon dioxide absorption line 2 can be breathed out. It includes a rotary valve for communication between pipe 3 and conduit 5.

FIG. 2 shows a cross section of the carbon dioxide absorption line 2 and the release device 15.

A carbon dioxide absorbent 17 is housed in the cylindrical can body 16 of the carbon dioxide absorption line 2.

A lid 18 for refilling the carbon dioxide absorbent 17 is fastened to one end (left side in FIG. 2) of the housing 16 with a screw 19.

The exhaled air flowing in from the inlet 20 at the other end (right side in FIG. 2) of the housing 16 passes through the perforated plate 21 → carbon dioxide absorbent 17 → filter 22 → perforated plate 23 → ventilation hole 24 → central passage 25.
The purified gas after carbon dioxide is removed from the exhaled air is sent to outlet 2.
It reaches 6.

The valve seat 27 of the opening device 15 is fixed to the other end of the carbon dioxide absorption line 2 and has circular valve holes 28 and 29 opening at the inlet 20 and outlet 26, respectively.

The main body 30 of the opening device 15 is screwed onto the valve seat 27 by a screw member 31 extending along the axis of the housing 16 .

The polygonal head 32 of the screw member 31 can be fitted into a locking hole 35 formed in the knob 33 by pushing the knob 33 against the elastic force of the spring 34. In the fitted state, the knob portion 33 and the screw member 31
By turning the main body 30, the main body 30 can be attached and detached from the valve seat 27. Such a structure prevents the screw member 31 from unintentionally loosening and helps maintain a secure screwed state.

3 shows the front of the opening device 15, FIG. 4 shows the right side of the opening device 15, and FIGS. 5 and 6 are views taken from the section lines ■-■ and VI-VI in FIG. 2. A cross section is shown.

Referring to these figures, the main body 30 has connection ports 36, 37 connected to the exhalation tube 3 and the conduit 5, respectively.

A flow path portion 38.39 having a circular cross section parallel to the axis of the housing 16 is formed in the middle of the flow path connecting each of the connection ports 36.37 to the valve hole 28.29.

In this channel part 38, 39 there are rings 40° 41 and springs 4.
2.43, it is elastically biased towards the valve seat 27 side.

The valve plate 44 is in sliding contact with the valve seat 27, and the boss 45 of the valve plate 44 is loosely fitted into the screw member 31.

The rings 40 and 41 press the valve plate 44 against the valve seat 28 by the spring force of the springs 42 and 43 to improve airtightness in the valve closed state where the valve holes 28 and 29 are closed by the valve plate 44, and This serves to prevent the carbon dioxide absorbent 17 from absorbing carbon dioxide gas in the atmosphere and become incapacitated, and also to prevent gas from leaking between the inlet 28 and the outlet 29 in a short-circuit manner.

Ventilation holes 46 and 47 are formed in the valve plate 44 in correspondence with the valve holes 28 and 29 of the valve seat 27.

The valve seat 27 and the valve plate 44 form the main part of the rotary valve.

A pin 49 fixed to the main body 30 is engaged with an arcuate notch 48 partially provided in the circumferential direction on the outer periphery of the valve plate 44, thereby regulating the range of rotation angle of the valve plate 44.

Therefore, the valve opening state shown in FIGS. 2, 5, and 6, in which the valve holes 28, 29 of the valve seat 27 and the vent holes 46, 47 of the valve plate 44 are almost completely aligned with each other, is reliably maintained. The desired increase in respiratory resistance is prevented.

A lever 50 extending radially is fixed to the boss 45 of the valve plate 44 .

A free end 50 a of the lever 50 is loosely fitted into one end of a screw spring 51 , and the other end of the torsion spring 51 is pivotally connected to a pin 52 erected on the main body 30 .

This torsion spring 51 exerts a spring force in the direction of separation between one end and the other end.

A piston rod 53 that can come into contact with the free end 50 a of the lever 50
A single-acting cylinder 54 having a diameter is fixed to the main body 30.

The head side chamber of the cylinder 54 is connected by a conduit 55 to the outlet port of the blocking valve 11.

The piston 56 and therefore the screw I/n rod 53 are connected to the spring 57.
It is displaced toward the cylinder head by the

Another lever 58 is fixed to the boss 45 of the valve plate 44 and extends on the same radius line of the boss 45 in the opposite direction to the lever 50 .

This lever 58 is for manually rotating the boss 45 and therefore the valve plate 44, and also serves as the lever 58.
By writing characters indicating the valve open state and the valve closed state at the rotation angle positions on the main body 30 of 8, the open and closed states of the valve can be displayed at a glance.

The levers 50 and 58 abut stopper surfaces 59 and 60 (see FIG. 5) formed on the main body 30, respectively, in the valve closed state, and abut stopper surfaces 61 and 62, respectively, in the valve open state.

Therefore, the lever 50.58 and the stopper surfaces 59-62, together with the combination of the notch 48 and pin 49 in FIG.
The same rotation angle range of the valve plate 44 is restricted.

A drain pipe 64 whose lower end is sealed by a plug 63 is connected to the lower part of the connection end 36 with the exhalation pipe 3 to prevent moisture contained in exhaled breath from flowing into the carbon dioxide absorption line 2.

Let's talk about the operation.

When the respiratory apparatus and therefore the carbon dioxide absorption line 2 are not in use, the opening device 15 is in the state shown by the solid line in FIG. 3, and in the state shown in FIGS. 4 and 5. The rotation angles around the threaded member 31 with the valve holes 28, 29 of 27 are completely offset, so that the opening device 15 seals the carbon dioxide absorbent 17 in the can 16.

When the blocking valve 11 is opened when using this respiratory device, oxygen from the oxygen cylinder 10 is supplied to the respiratory circulation circuit 7 via the pressure reducing valve 12 and the throttle 13, and is also introduced to the opening device 15 via the conduit 55. It will be destroyed.

In the above-mentioned opening device 15 when not in use, the conduit 55 is now
When oxygen is introduced, the pressure of the oxygen causes the piston 56 to move upward in FIG. 3 against the elastic force of the spring 57.

In response, the piston rod 53 pushes the free end 50a of the lever 50.

Therefore, the position of the free end 50a of the lever 50 is pushed by the tip of the piston rod 53, and the straight line connecting the screw member 31 and the pin 52 (the line between the axis 31 of the screw member 31 and the valve plate 44 and the pin 52 in FIG. When the straight line connecting the axes) is exceeded, the spring 5
1 moves the lever 50 to the rotational position where the lever 50.58 abuts the stop surface 62.61, respectively, as shown in FIGS. 3 and 5.
It is rotated counterclockwise in the figure and held at the rotated position as shown by the imaginary line in FIG.

By rotating the lever 500, the valve plate 44 is brought into the state shown in the sixth figure, and the vent holes 46 and 47 of the valve plate 44 and the valve holes 28 and 29 of the valve seat 27 overlap, resulting in the valve being in the open state as shown in the second figure. Become.

Therefore, the carbon dioxide absorption line 2 is opened to the respiratory circulation circuit 7 and becomes ready for use.

When the stop valve 11 is open, oxygen pressure acts on the piston 56, and the tip of the piston rod 53 is connected to the screw member 3 shown in FIG.
1 and the axis 31 of the valve plate 44 and the axis of the pin 52.

Therefore, even if the valve plate 44 is erroneously operated in the closing direction by the lever 58, the tip 50a of the lever 50 will not exceed the chain line l, and therefore the direction of action of the rotational component of the elastic force of the screw spring 51 will be Since the valve plate 44 remains unchanged, the valve plate 44 rotates again in the opening direction and returns to the state shown in FIG.

There is thus no risk of the valve plate 44 occluding the breathing circuit during use.

When the blocking valve 11 of the cylinder 10 is closed in the opening device 15 once opened, the pressure of oxygen pushing the piston 56 is released.

Therefore, the reaction force of the spring 57 overcomes and pushes the piston 56 back, and the tip of the piston rod 53 retreats from the chain line l in FIG. and clockwise in Fig. 5) to open the can 2.
The respirator can also be resealed, making it easier to perform various tests on the respirator.

In the unlikely event that cylinder 54 is not activated by oxygen from oxygen cylinder 10, lever 58 can be manually operated to open release device 15.

As mentioned above, when the free end 50a of the lever 50 crosses the straight line connecting the screw member 31 connecting the screw member 31 and the pin 52 and the axis 31 of the valve plate 44 and the axis of the pin 52, the spring 51 is in the valve open state. Since the opening device 15 is forcibly held, there is no risk that the opening device 15 will shut off during use.

As a further embodiment of the invention, the pressure for actuating the opening device 15 may be a secondary pressure from the pressure reducing valve 12, or alternatively to maintain the partial pressure of oxygen at a set value in the underwater breathing apparatus. Therefore, the pressure of helium gas, nitrogen gas, etc. used as a diluting gas may be used.

The invention can also be implemented in connection with so-called semi-closed circulation respirators in which there is no automatic replenishment valve 14 and the flow rate of the throttle 13 is selected to be relatively large.

According to the embodiments described above, cylinder 54.
Since the valve 60 opens the carbon dioxide absorption line, no special manual operation is required to open the carbon dioxide absorption line, making it extremely easy to use the respirator in an emergency.

As described above, according to the present invention, the carbon dioxide absorption edge is opened by the rotary valve, so the configuration is simple.
Not only can it be made smaller, it is easier to install than the conventional sealing plates mentioned above, improving productivity, and the valve can be opened and closed freely, making it suitable for respiratory inspection. It has the advantage of being easy to perform.

[Brief explanation of the drawing]

Fig. 1 is an overall system diagram of an embodiment of the present invention, Fig. 2 is a sectional view of the carbon dioxide absorption edge 2 and the opening device 15 of an embodiment of the invention, and Fig. 3 is a front view of the opening device 15. 4 are right side views, and FIGS. 5 and 6 are simplified sectional views taken along lines VV and VI-VI in FIG. 2. 1... Mask, 2... Carbon dioxide absorption rim, 3... Exhalation tube, 4... Breathing bag, 6...
...Inhalation pipe, 7...Respiratory circulation circuit, 9.
...Gas source, 10...Oxygen cylinder, 11
...Blocking valve, 12...Pressure reducing valve, 13.
・・・・・・Constriction of fixed amount supply, 15・・・・・・Release device,
27... Valve seat, 28, 29... Valve hole,
30... Opening device main body, 31... Screw member, 44... Valve plate, 45... Boss,
46.47...Vent hole, 50...Lever, 51...Torsion spring, 52...Pin, 53...Piston rod, 56...Piston, 57...Spring.

Claims (1)

[Claim for Utility Model Registration] A respiratory circulation circuit is constructed by connecting a mask 1, a carbon dioxide absorption line 2, and a breathing bag 4, and a gas source 9 that supplies gas necessary for breathing is connected to this respiratory circulation circuit. In a circulation type respirator, one end of the carbon dioxide absorption line 2 is provided with a population 20 into which exhaled air from the mask 1 flows, and an outlet 26 for purified gas into the breathing bag 4, A valve seat 27 fixed to one end has valve holes 28 and 29 communicating with the inlet 20 and outlet 26, respectively, and the valve seat 27 has ventilation holes 46 and 47 corresponding to the valve holes 28 and 29, respectively. A valve plate 44 having a valve plate 44 is rotatably arranged, and a valve hole 28.
The ring 40.41 is connected to the spring 42.4 corresponding to the position of 29.
One end of a torsion spring 51 is connected to the lever 50 which is elastically abutted by 3 and fixed to the valve plate 44, and the other end of the torsion spring 51 is supported in a fixed position with respect to the valve seat 27. The torsion spring 51 exerts a spring force in the direction of separation between one end and the other end, and thereby the free end 50 of the lever 50
When a is on one side with respect to the straight line connecting the valve plate 44, the axis, and the support position of the torsion spring 51, the vent holes 46, 47 of the valve plate 44 are shifted from the valve holes 28, 29 of the valve seat 27, and the valve is in the closed state. , and when the free end 50a of the lever 50 is on the other side with respect to the straight line, the vent hole 46,47 is located in the valve hole 28,
29, the valve is in an open state, and the free end 50 of the lever 50 is opened in response to the gas supplied from the gas source 9 to the respiratory circulation circuit.
A device for opening a carbon dioxide absorption line in a circulation type respirator, characterized by comprising a cylinder 54 having a piston rod 53 that displaces a from the front side to the other side with respect to the straight line.