JPS6054025A - Reducing valve - Google Patents

Abstract

PURPOSE:To adjust surely the pressure of a reducing valve and to improve the safety by energizing a valve body in the direction, where the valve body goes away from a valve seat, and displacing the valve body against the spring force of a multiple spring in the direction where the valve body approaches the valve seat. CONSTITUTION:When air is discharged by inhalation and the pressure in a pressure chamber 89 is reduced, a valve body 82 is displaced in the direction, where the valve body 82 goes away from a valve seat 80, by double springs 88 and 88a, and a space 94 is generated between the valve seat 80 and one end part of the valve body 82, and high-pressure air in a valve chest 76 has the pressure reduced and is flowed into a flow passage 83. Flowed-in air is led to a air tube 7a through the pressure chamber 89 and a flow passage 90. When the pressure in the pressure chamber 89 rises by this flowing, the valve body 82 is displaced in the direction, where the valve body approaches the valve seat 80, against the spring force of double springs 88 and 88a to keep the airtight state. Even if one spring is faulty, the other is operated to supply a gas for inhalation continuously; and therefore, the safety is improved considerably by this double structure of the outside sping 88 and the inside spring 88a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure reducing valve used in, for example, a respiratory device.A pressure reducing device used in a respiratory device biases a valve body away from a valve seat by a single spring, and The valve body is configured to be displaced toward the valve seat by gas pressure through a flow path formed in the valve body against the spring force of a fist spring. In such prior art, the pressure of the pressure reducing valve is adjusted by the spring of the ton, so if the spring fails and stops exerting its spring force, the valve body remains seated on the valve bottom. As a result, the intake gas is cut off, and the pressure of the pressure reducing valve cannot be adjusted normally. Therefore, there is a risk that the inhalation gas may not be sent normally, resulting in difficulty in breathing.

An object of the present invention is to solve the above-mentioned technical problems and provide a pressure reducing valve that can reliably adjust the pressure of the pressure reducing valve and has the same safety.

FIG. 1 is an overall front view of an embodiment of the present invention. This open-type respirator 1 includes a pressure vessel 2 filled with a breathing gas such as air under pressure, a mounting means 8 for attaching the pressure vessel 2 to a human body, and a gas outlet of the pressure vessel 2. A pressure reducer 5 that reduces the pressure of high pressure air supplied from the pressure vessel 2 when the attached container valve 4 is opened, a connecting means 6 that connects and detachably connects the container valve 4 and the pressure reducer 5, and a pressure reducer 5. Air supply pipes 7a and 7b for guiding the air after the pressure has been reduced in Includes a face piece 10. The pressure vessel 2 is filled with air at a relatively high pressure, for example, 3 Q kg/cm2.

FIG. 2 is a simplified system diagram of the open-type respirator 1, where the solid line shows the high pressure line where the high pressure in the pressure vessel 2 acts directly, and the broken line shows the line after the pressure is reduced by the pressure reducer 5. A line of low pressure is shown, and a double line shows a line of pressure around atmospheric pressure. When the container valve 4 is opened, the air in the pressure container 2 is guided from the container valve 4 through the connecting means 6 to the pressure reducer 5, and in this pressure reducer 5, for example, 7 to 8 kg g7Crn 2
K is depressurized.

The decompressed air is guided to the pulmonary force valve 8 via the air supply pipes 7a and 'lb. Air guided to the pulmonary force valve 8 is inhaled through the facepiece 1O, while exhaled air is exhausted through the exhalation valve 9.

3 is a top view of the pressure reducer 5, and FIG. 4 is a longitudinal sectional view of the pressure reducer 5. In Figure 4, single-point chain #! A-A
The lower part is along the cutting plane line B-(, D
The section on one side of the dashed-dotted line A--A shows the section as seen from the section line E--E in FIG. 3.

A flow path 72 communicating with the flow path 44 of the connecting body 28 is formed in the main body 71 of the pressure reducer 5 . This flow path 72 is formed in the main body 71 and communicates with four parts 73 that are open to the outside of the main body 71. The valve chamber 76 is formed by fitting the fitting member 74 into the recess 78 from below in FIG. 4, and screwing the holding member 75 onto the main body 71 from below to fix the fitting member 74. The aforementioned flow path 72 communicates with the valve chamber 76 via a through hole 77 formed in the fitting member 74 . A fitting recess 78 is formed in the end surface of the holding member 75 facing the valve chamber 76 . A synthetic resin fitting body 79 is inserted into this fitting recess 78 using an O-ring 8.
By fitting through 1, a valve seat 8o is formed.

The valve body 82 has a cylindrical shape with an air passage 83, and one end thereof is hermetically inserted into the valve chamber 76 in a direction perpendicular to the valve seat 8o. An outward flange 85 having a pressure receiving surface 84 having a relatively large pressure receiving area is formed at the curved end of the valve body 82 facing the spring chamber 86 . An O-ring 87 is provided on the outer periphery of the outward flange 85 so as to be in sliding contact with the inner wall of the spring chamber 86 . Inside the spring chamber 86, a coiled inner spring 881L surrounding the valve body 82 and a coiled outer spring 88 are housed. The valve element 82 is urged in a direction away from the valve seat 80 by the spring force of the double barbs 88, 88a.

A pressure chamber 89 formed by the pressure receiving surface 84 of the outward flange 85 and the end inner wall of the spring chamber 86 is communicated with the ridge opening 91 via the flow path 9(). Air supply pipe 7 is installed at the entrance to the mausoleum 91.
a is fitted through the O ring 92, and the air supply pipe 7a
is fixedly connected to the cap 250 by a cap nut 93. Further, a safety valve 110 is provided in the middle of the flow path 90.

When the container valve 4 is opened, compressed air within the pressure vessel 2 is guided into the pressure reducer 5 via the connecting means 6. Air flowing into the valve chamber 76 from the flow path 72 through the through hole 77 is guided from the flow path 83 through the pressure chamber 89 and the flow path 90 to the air supply pipe 7a. As a result, when the pressure in the pressure chamber 89 increases, the valve body 8
2 is displaced in the direction approaching the valve seat 80 against the spring force of the double barbs 88, 88&, and the pressure in the pressure chamber 89 increases to 7 to 8.
When the pressure is about kg/cm 2 , one end of the valve body 82 comes into contact with the valve seat 80 to maintain airtightness. When air is released by intake and the pressure in the pressure chamber 89 decreases, the valve body 82 is displaced in the direction away from the valve seat 80 by the double barbs 88 and 888, and the valve seat 80 and one end of the valve body 82 are A gap 94 is created, and the high pressure air in the valve chamber 76 is reduced in pressure and flows into the flow path 83.

One end of the inner spring accommodated in the spring chamber 86 is supported by a spring receiving portion 112 formed at the bottom 868 of the spring chamber 86, and its curved end is supported by the outward flange 85 of the valve body 82. The outer spring 88 surrounding the inner spring 88B is formed by the bottom 86a of the spring chamber 86 and the outward flange 85.
Both ends are supported. The outer spring 88 and the inner spring 88a exert almost the same spring force. In this way, the double structure of the outer spring 88 and the inner spring 881 allows the valve body 82 to be attached to the valve seat 8.
0 in the direction of separation. Therefore, even if one of the springs 88 or 88a fails and stops exerting its spring force, the spring 88 & or 88 will work, allowing the valve body 82 to separate from the valve seat 80, allowing the intake gas to be removed. It is possible to continue supplying. Therefore, safety is improved.

Referring to FIG. 5, O-ring 81 in fitting recess 78
Assume that the system malfunctions for some reason. If this O-ring 81 no longer performs its sealing function, the valve chamber 7
6 comes to act on the end surface of the fitting body 79 opposite to the valve seat 80 through the gap between the fitting body 79 and the fitting recess 78 . During the pressure reduction operation of the pressure reducer 5, a relatively low pressure acts on the center portion of the valve seat 80 corresponding to the flow path 83, and the remaining portion other than the center portion is
High pressure in the valve chamber 76 is acting. Therefore, the fitted body 7
Opposite the valve seat 80 of No. 9 (when high pressure is applied to the end face of the iUI, the central part of the valve seat 80 is opposite to the valve body 80 as shown by the imaginary line).
It will protrude in a direction approaching the , making it impossible to perform its decompression function.

Therefore, a relief hole 95 is formed in the holding member 75, one end of which communicates with the bottom of the four fitting portions 78, and one end of which communicates with the atmosphere. By providing this relief hole 95, even if the O-ring 81 fails and the sealing function is not achieved, the high-pressure air in the valve chamber 76 will flow to the end surface of the fitting body 79 opposite to the valve seat 8o and the fitting recess. 78, the high pressure air escapes to the atmosphere. Therefore, the central portion of the valve seat 8o is prevented from bulging as described above. Moreover, since the relief hole 95 functions to occupy air when fitting the fitting body 79 into the fitting recess 78, the fitting operation becomes easy. Furthermore, when replacing the fitting body 79,
The fitting body 79 can be easily taken out from the fitting recess 78 by inserting a suitable rod member into the fitting member 5 and pressing the fitting body 79 from the back side.

Irregularities lO3 are formed on the inner wall of the flow path 83 close to the valve seat 8o. In this embodiment, the unevenness 108 is, for example, a screw having an M3.5 pitch of 0.6 mm, a length l in the axial direction of the valve body 82 = 5 mm, and an inner diameter of the thread d 1 = 8.2 mm. -, the outer diameter d2 of the valve body 82 is 4.6 mm-, and the free end 82a of the valve body 82 has a 45° conical shape that tapers inward in the axial direction (upper part of FIG. 5). form a face. According to the inventor of the present invention, when such unevenness 10B was not formed, a "beep" sound was generated that the wearer could hear well, but by forming the unevenness 108, this sound could be suppressed. It was confirmed that it was gone.

Although the unevenness 103 is a screw in the above embodiment, it may be an unevenness existing in the pond structure 2 in the embodiment of the pond of the present invention, so that the gas flowing from the valve chamber 76 to the flow path 83 forms a vortex. It is sufficient if the configuration is such that it does not generate any sound.

The invention can be widely implemented in pressure reducing valves associated with respiratory systems as well as in pond pressure reducing valves. Alternatively, the number of springs 88, 888 is not limited to this embodiment, and may be three or more.

As described above, according to the present invention, the valve body 82 is urged in the direction away from the valve seat 80 by the double barb 88, 88a,
Gas pressure through a flow path 83 formed in the valve body 82 causes the valve body 82 to be moved to the first position in the direction toward the valve seat 8o against the spring force of the double barb 88°888. Therefore, by using a plurality of springs 88, 88a,
Even if one of the springs fails, the hydraulic spring works to continue supplying intake gas, so the safety of the pressure reducing valve has been significantly compromised.

[Brief explanation of drawings]

FIG. 1 is an overall front view of an embodiment of the present invention, FIG. 2 is a simplified system diagram of the open-type breathing apparatus 1, FIG. 3 is a side view of the pressure reducer 5, and FIG. 4 is the pressure reducer. 5 is a vertical cross-sectional view of valve body 8.
2 is an enlarged cross-sectional view of a portion close to the valve seat 8o of No. 2. FIG. DESCRIPTION OF SYMBOLS 1... Open type breathing apparatus, 5... Pressure reducer, 8o... Valve seat, 82... Valve body, 83... Channel, 88... Outer spring, 88a... Inner spring , 89...Pressure chamber agent Patent attorney Kei Nishi

Claims (1)

[Claims] The valve body is urged in a direction away from the valve seat by a plurality of coaxially arranged multiple springs, and the valve body resists the spring force of the multiple springs by gas pressure through a flow path formed in the valve body. 1. A pressure reducing valve characterized in that the pressure is changed in a direction toward a valve seat.