JPH0244769Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to an exhaust valve attached to a circulation type breathing apparatus.

Conventional exhaust valves of this type include, as shown in Figure 5,
There is a case 2 with an exhaust hole 1 in which the valve body 3 is configured to constantly close the exhaust hole 1 by the elasticity of a spring 4. The exhaust hole 1 gradually opens, and the pressure may be slightly exhausted before the pressure reaches a certain level.

This device closes the exhaust port until a certain pressure is reached even if the pressure inside the respiratory device rises, and automatically opens the exhaust port when the pressure exceeds a certain level. The purpose is to provide an exhaust valve that operates to cut off the intake of outside air when the inside becomes negative pressure.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 4 denotes a case, one end of which is open and the other end covered by a bottom plate 6 having a through hole 5. Reference numeral 7 denotes a ventilation pipe that communicates with the inside of the respiratory organ. A threaded groove 8 is provided on the outer peripheral surface of the ventilation pipe 7. A flange 10 is provided on the outer periphery of a connection port 9 inserted into the inside of the case 4. The protruding end is inserted into the inside of the respiratory organ wall 11 through a through hole 12 made in a part of the respiratory organ wall 11, and a nut 1 is inserted into the insertion end.
3 is screwed in. Reference numeral 14 denotes an expansion cylinder molded from rubber, which has a thin diameter-reduced part 15 at one end, a thicker diameter-enlarged part 16 at the other end, and has an enlarged cylinder wall on the side of the diameter-reduction part 15. An elastic bending wall 17 is provided which is bent by being pushed into the cylindrical wall on the side of the diameter part 16, and the reduced diameter part 15 has a packing 18 which is inserted between the bottom plate 6 of the case 4 and the flange 10 of the ventilation pipe 7.
are integrally molded, and the enlarged diameter portion 16 has a pair of protrusions 19 and 20 that protrude at intervals from both the inner and outer surfaces.
are all surrounded by one. Reference numeral 21 denotes a shielding plate that closes off the opening on the enlarged diameter side of the expansion cylinder 14. A flange 22 is provided on the peripheral edge of the shielding plate 21 to be inserted between the protrusions 19 and 20. An exhaust hole 23 is provided at a position facing the connection port 9 of the ventilation pipe 7, that is, at the center of the shielding plate 2, and at the edge of the exhaust hole 23,
A flange 24 protruding toward the open end side of the enlarged diameter portion 16 is provided. Reference numeral 25 designates a shaft rod passed through the center of the exhaust hole 23, and the end inserted into the expansion cylinder 14 is provided with a return body 26 for opening and closing the exhaust hole 23, and the end protruding outside the expansion cylinder 14 is provided with a return body 26. An end plate 27 is provided. 28
is a gasket interposed between the valve body 26 and the connection port 9 of the ventilation pipe 7, which is interposed by adhering to the valve body 26, and prevents the connection of the ventilation pipe 7 when the exhaust hole 23 is closed by the valve body 26. It is shaped to seal the mouth 9. A spring 29 is wound around the shaft rod 25 and suspended between the closing plate 21 and the end plate 27, and urges the valve body 26 to always close the exhaust hole 23. 30 is a cover plate attached to the opening of the case 4 by screwing or fitting;
The end plate 27 is attached at a position where the end plate 27 abuts upon expansion of the expansion cylinder 14, and a ventilation hole 31 is provided around the end plate 27. Reference numeral 32 denotes an annular projection provided on the inner surface of the bottom plate 6 of the case 4 at a position close to the flange 10 of the ventilation pipe 7, and serves to press down the gasket 18.

Next, to explain the operation of the exhaust valve constructed as described above, while the pressure inside the breathing apparatus is maintained below a certain pressure, the expansion tube 1 is opened as shown in the first figure.
4 shrinks toward the bottom plate 6 of the case 4 due to the elasticity of the elastic bending wall 17, the end plate 27 separates from the cover plate 30, receives the elasticity of the spring 29, and draws the shaft rod 25 toward the cover plate 30. The valve body 26 is energized so that it closes the exhaust hole 23.

In this state, the work load of the person wearing the respirator decreases, the amount of air or oxygen consumed becomes less than the amount supplied, and the pressure inside the respirator increases, creating a feeling of tightness when breathing. When the pressure exceeds a certain level, the expansion cylinder 14 expands against the elasticity of the elastic bending wall 17, as shown in the second figure. Then, the gasket 28 separates from the connection port 9 of the ventilation pipe 7 to open the connection port 9, and then the end plate 27 hits the cover plate 30, and then the blocking plate 21 resists the elasticity of the spring 29 and closes the cover plate 30. As it is pressed to the side, the exhaust hole 23, which had been closed by the valve body 26, is separated from the valve body 26, and the exhaust hole 23 is opened, and the air or oxygen in the respiratory apparatus is released as shown by the arrow in FIG. The air then passes through the exhaust hole 23 and is then exhausted to the outside of the case 4 through the ventilation hole 31. When the pressure inside the respiratory organ decreases to a constant pressure due to this discharge, the elastic bending wall 17
The elasticity of the spring 29 acts on the expansion tube 14 to shrink it back to its original size, causing the end plate 27 to separate from the cover plate 30. At the same time as the gasket 28 is biased to the closed state, the gasket 28 returns to the state where the connection port 9 of the ventilation pipe 7 is closed.

Further, when the pressure inside the respiratory system becomes negative in a state where the valve body 26 closes the exhaust hole 23 as shown in the first figure, the gasket 28 connects the valve body 26 and the connection port 9 of the ventilation pipe 7. In between, the connection port 9 is sealed to prevent harmful gases from outside the case 4 from being sucked into the respiratory system.

In the above embodiment, an example was shown in which the packing 28 was bonded to the valve body 26, but the present invention is not limited to this, and the packing 28 may be bonded to the mouth end of the connection port 9 of the ventilation pipe 7 as shown in the third figure. , a gasket 33 for closing the exhaust hole 23 may be fitted into the valve body 26,
In addition, as shown in the fourth figure, the gasket 28 and the exhaust hole 23
In some cases, a gasket 34 that closes the valve is integrally molded, and the gasket 34 is fitted into the valve body 26.

Since the present invention is configured as described above, when the pressure inside the respiratory organ is below a certain level, the valve body reliably closes the exhaust hole even if it is subjected to vibration or pressure changes, allowing breathing Air or oxygen inside the device can be prevented from leaking, and even if the pressure inside the respiratory system becomes negative, the connection port of the ventilation tube is sealed with a gasket, preventing harmful gases from outside the respiratory system from being breathed. Prevents it from being sucked into the container. In addition, if the pressure inside the respiratory apparatus exceeds a certain level, the exhaust hole that was blocked by the valve body will automatically separate from the valve body, and the exhaust hole will be opened to release air and oxygen from the respiratory system. It has the advantage of being able to prevent the exhaust gas from giving a feeling of pressure to the person wearing the respirator, making it highly suitable as an exhaust valve for a respirator.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the exhaust valve according to the present invention when it is closed, Fig. 2 is a sectional view of the same exhaust valve when it is open, and Fig. 3 is a sectional view showing a modified embodiment of the main parts of the present invention. , 4th
The figure is a sectional view showing another modified embodiment of the main part of the present invention, and FIG. 5 is a sectional view of a conventional exhaust valve. 4... Case, 7... Ventilation pipe, 11... Respiratory organ wall, 14... Expansion cylinder, 15... Reduced diameter part, 16
... Expanded diameter part, 17 ... Elastic bending wall, 21 ... Shielding plate, 23 ... Exhaust hole, 25 ... Shaft rod, 26 ... Valve body, 27 ... End plate, 28 ... Packing, 29 ……
Spring, 30...Lid plate, 31...Vent hole.

Claims (1)

[Claims for Utility Model Registration] (1) One end of an inflatable tube placed inside a case is connected to a ventilation pipe communicating with the inside of a respiratory organ at the bottom of the case, and the other end of the inflatable tube is covered with a shielding plate, an exhaust hole is provided in the shielding plate at a position facing the connection port of the ventilation pipe, a shaft rod is passed through the exhaust hole, and the expansion hole of the shaft rod is covered with an exhaust hole. A valve body for opening and closing the exhaust hole is provided at the end inserted into the cylinder, and a valve body for opening and closing the exhaust hole is provided between the valve body and the connection port of the ventilation pipe, and when the exhaust hole is blocked by the valve body, the ventilation pipe is closed. An end plate is provided at the end of the shaft rod that protrudes outside the expansion tube, and the valve body is placed between the end plate and the shielding plate. A spring is suspended to bias the exhaust hole so as to always close it, and a lid plate is attached to the opening on the opposite side of the bottom of the case, with which the end plate abuts when the expansion cylinder is inflated. is an exhaust valve with a ventilation hole. (2) The expansion cylinder is bent by providing a reduced diameter part at one end and an enlarged diameter part at the other end, and pushing the cylinder wall on the reduced diameter part side into the cylinder wall on the enlarged diameter part side. 1. The exhaust valve according to claim 1, which is a utility model, and comprises a rubber expansion tube provided with an elastic bending wall.