JPH0247964Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a pulmonary force valve for respiratory organs.
A diaphragm is actuated in response to pressure changes associated with human breathing, and a valve body responsive to the diaphragm is displaced toward the pilot nozzle to open and close the pilot nozzle, thereby creating a flow path for intake gas. This invention relates to a pulmonary force valve that opens and closes a valve hole to control the supply of inhalation gas.

The so-called positive pressure pulmonary pressure valve, which maintains a pressure slightly higher than atmospheric pressure in the facepiece that covers the mouth and nose of the person wearing the respirator, opens the blocking valve of the pressure vessel to test the tightness of the respirator. When the intake gas is supplied by
Inspiratory gas will be released unless the mask is worn tightly against the face. Therefore, the work of airtightness test is troublesome. In addition, in order to avoid wasting the intake gas, it is necessary to first attach the face piece tightly to the face and then open the blocking valve, which is cumbersome.

It is an object of the present invention to provide a pulmonary force valve for a respiratory apparatus with improved operability and no loss of inspired gas.

Embodiments of the present invention will be described below with reference to the drawings. 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 3 for removably loading the pressure vessel 2 and attaching it to the 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 container valve 4 is opened; a connecting means 6 that connects and detaches the container valve 4 and the pressure reducer 5; Air supply pipes 7a and 7b for guiding the air after the air is removed, a lung pressure valve 8 connected to the air supply pipe 7b, a lung pressure valve 8, and an exhalation valve 9 are fixedly provided, and a facepiece 10 covers the front surface of the human head. including. Inside the pressure vessel 2, there is a relatively high pressure, for example 300 kg/cm ²
is filled with air.

FIG. 2 is a simplified system diagram of the open-type respirator 1, where the solid line shows the high pressure line on which the high pressure in the pressure vessel 2 directly acts, and the broken line shows the low pressure line after the pressure is reduced by the pressure reducer 5. A line of 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.
The pressure is reduced to, for example, 7 to 8 kg/cm ² . The decompressed air passes through the air supply pipes 7a and 7b to the pulmonary force valve 8.
guided by. The air guided to the pulmonary force valve 8 is passed through the facepiece 10
Air is inhaled through the exhalation valve 9, while exhaled air is expelled through the exhalation valve 9.

FIG. 3 is a partially cutaway sectional view of the rotary joint 124 and the pulmonary force valve 8. The rotary joint 124 is integrally formed with the main body 144 of the pulmonary force valve 8 and is attached to a pivot tube section 145 that extends with a horizontal axis parallel to the front surface of the human body, and to the outer periphery of the pivot tube section 145. A lid 147 that closes the free end of the pivot tube portion 145, and a cap nut 148 for connecting the air supply pipe 7b to the rotation member 146. The other end of the air supply pipe 7b is connected to a connection port 149 of a rotary member 146 extending in the radial direction of a pivot pipe portion 145 with a cap nut 14.
8, and airtightly connected. A flow path 150 formed in the pivot tube portion 145 communicates with a flow path 151 formed in the main body 144 .

In this way, the air supply pipe 7b is connected to the pivot pipe portion 145.
The flow path 15 of the pulmonary force valve 8 is rotated freely around the
1. Therefore, it becomes extremely easy for a person wearing the face piece 10 to move his or her neck in the vertical direction.

Figure 4 is a plan view of Figure 3, and Figure 5 is a plan view of Figure 4.
This is a view with the cover 178 in the figure removed, and FIG. 6 is a sectional view taken along the cutting plane line - in FIG. 4. This pulmonary force valve 8 is a so-called positive pressure type pulmonary force valve in which the pressure inside the face piece 10 is higher than atmospheric pressure even during inhalation. The flow path 151 communicates with a valve hole 154 via a filter 153. A valve seat 155 formed facing the downstream side of the valve hole 154 in the flow direction has a flexible flat valve body 15 that is perpendicular to the axis of the valve hole 154.
6 is brought into contact. This valve body 156 includes a tip 256 having a small hole 254 in the center, and its peripheral portion is fixed to the nozzle mounting seat 162. This valve body 1
The space 15 with which the valve hole 154 can be communicated by 56
7 and a working chamber 158 on the opposite side of the valve hole 154 with respect to the valve body 156 are partitioned off. A discharge space 160 and a pressure chamber 170a that are partitioned by a cover 178 are formed in a portion of the main body 144 near the face piece 10. The discharge space 160 and the pressure chamber 170a are communicated with each other through a communication hole 179 formed in the cover 178. Ru.
The space 157 is connected to the discharge space 16 via the nozzle 159.
Connected to 0. A pilot nozzle 163 having a hole diameter larger than the small hole 254 formed in the center of the valve body 156 is fitted into the nozzle mounting seat 162 . Further, a support member 166 is attached to the nozzle mounting seat 162, and a swinging rod 164 extending perpendicularly to the pilot nozzle 163 is attached to the support member 166.
is pivotally supported by a pin 165. The pilot nozzle 163, the support member 166, the swinging rod 164, and the pin 165 are located inside the pressure chamber 170a.
0a and the pressure chamber 170b are the passages 169 and 2.
58. One end of a driving member 167 extending in a direction perpendicular to the swinging rod 164 is pivotally supported at the other end of the swinging rod 164 by a pin 168 . Pin 168 is parallel to pin 165. The other end of the drive member 167 extends in a direction away from the facepiece 10 and passes through the passage 169 to open the pressure chamber 170.
It is rushed into b. The pressure chamber 170b has a valve body 156
It is formed at a position far from the face piece 10 on the opposite side to the discharge space 160 with respect to the discharge space 160 .

The pressure chamber 170b is partitioned from a space 173 by a diaphragm 172 whose peripheral edge is fixed to the main body 144, and the space 173 is communicated with the atmosphere. In the pressure chamber 170b, the diaphragm 17
One end of a drive rod 175 is connected to the central portion of the drive rod 2, and the other end of the drive rod 175 is screwed to the other end of the drive member 167 facing the pressure chamber 170b. A diaphragm 172 is connected to a pressure chamber 170b in the space 173.
A spring 176 is housed on the side, that is, a spring 176 biasing the pilot nozzle 163 in the opening direction.

A screw member 180 is rotatably provided on the outer periphery of the main body 144 near the face piece 10. This screwing member 180 is formed with an outer flange 181 that protrudes outward in the radial direction, and a notch 182 (see FIG. 3) is provided around the outer periphery of the outer flange 181 to facilitate rotational operation. They are formed at equal intervals in the direction. An external thread 183 is formed on the screwing member 180, and by rotating the screwing member 180 around the outer periphery of the main body 144 with the outer flange 181, the screwing member 180 is screwed onto the face piece 10.

A mounting body 302 is fixed to the support body 300, and an operating knob 304 is mounted on the mounting body 302 so as to be freely angularly displaceable about an axis extending vertically in FIG. A moving body 306 is provided on the mounting body 302 .

FIG. 7 shows the mounting body 302 and the operation knob 304.
FIG. 3 is an exploded perspective view of the moving body 306 and In the mounting body 302, a right cylindrical guide wall 308 connects to the mounting plate 3.
It is erected at 10. This guide wall 308 has
Three guide notches 312 are formed that extend along the axial direction and are spaced apart by 120 degrees in the circumferential direction.
The guide wall 308 has three long holes 3 extending in the circumferential direction.
18 is formed. The mounting plate 310 has a guide wall 3
An insertion hole 324 is formed radially inward of 08. The mounting plate 310 also has a spring insertion hole 330 formed therein. Furthermore, a plurality of spring supporting protrusions 332 are formed on the mounting plate 310.

The operating knob 304 is formed roughly into a cap shape, and a stopper 342 is screwed onto the peripheral wall 340 of the operating knob 304 . This stopper 342 projects radially inward from the peripheral wall 340. Cap top 344
, attach 3 claws at equal intervals of 120° in the circumferential direction.
46 is formed.

The moving body 306 basically includes an inner cylinder 360,
It consists of an outer cylinder 362 and a top part 364. Inner cylinder 36
0, an internal thread 366 is formed, and this internal thread 3
A spring receiver 350 (see FIG. 6) is screwed onto 66 so that its displacement can be adjusted in the axial direction. Notches 368 are formed at the free end of the outer cylinder 362 at equal intervals in the circumferential direction. The tips of the outer tube 362 thus divided can be individually inserted into the insertion holes 324. Three guide protrusions 370 protruding outward in the radial direction are formed on the top portion 364 at equal intervals in the circumferential direction. Also, this top portion 364 has a claw 3.
Three recesses 372 are formed corresponding to 46, and the claws 3 extend from the top 364 to the outer cylinder 362.
Three release notches 374 are formed corresponding to 46.

Referring to FIG. 8, the claw 346 is the operating knob 3.
Slanted surfaces 380, 382 having a gentle slope with respect to the cap top 344 of 40, and an abutting surface 384.
and a vertical surface 386 continuous to the inclined surface 382. The release notch 374 includes a bottom surface 388, a pair of vertical surfaces 390, and an inclined surface 392. An inclined surface 394 and a flat surface 396 are formed across the release notch 374 and the recess 372.

The diaphragm 172 has a resilient force in the downward direction in FIG. 6, that is, in the direction in which the pilot nozzle 163 is closed.

A first spring 176 is interposed between the spring receiver 350 and the diaphragm 172. Mobile body 306
From between the inner cylinder 360 and outer cylinder 362 of the mounting body 3
There is another one between the spring support protrusion 332 of 02.
Two second springs 402 are interposed. First spring 176
is inserted through the spring insertion hole 330 of the mounting body 302. The spring constant of the first spring 176 is the same as that of the second spring 40.
The spring constant is selected to be smaller than the spring constant of 2.

The contact surface 384 of the claw 346 is the bottom surface 3 of the recess 372.
76 due to the spring force of the second spring 402, the diaphragm 172 is in contact with the first spring 1
It is biased upward in FIG. 6 by the spring force at 76. In this state, the valve body 156 comes into contact with or separates from the valve seat 155 according to the breathing of the person wearing the face piece 10, and air from the air supply pipe 7b is introduced into the face piece 10 or blocked. I do things. First, regarding the positive pressure type pulmonary force valve shown in FIG. 6, when compressed air is guided from the flow path 151 to the valve hole 154,
The valve body 156 is separated from the valve seat 155 by the pressure of compressed air, so that the valve hole 154 and the space 157 communicate with each other, and the air is ejected into the space 157 and through the nozzle 159 into the discharge space 160 . Discharge space 16
The air released to 0 increases the pressure within the face piece 10, and at the same time also increases the pressure within the pressure chambers 170a and 170b, pushing the diaphragm 172 downward in the figure. The displacement of the diaphragm 172 is determined by the drive rod 175,
is transmitted to the swinging rod 164 by the driving member 167,
The swinging rod 164 abuts the pilot nozzle 163 and closes the nozzle's discharge port 260. Accordingly, the pressure inside the working chamber 158 increases due to the air flowing in from the small hole 254 of the valve body 156, and the pressure in the working chamber 158 increases, causing the valve body
56 is pressed against the valve seat 155, and the jetting of air from the valve hole 154 into the space 157 is stopped. At this time, the pressure inside the facepiece 10 is higher than the outside pressure (for example, +
38mmH ₂ O).

Assume that the pressure inside the face piece 10 decreases slightly in response to intake air. The pressure drop inside the face piece 10 is reduced by the communication hole 179, the pressure chamber 170a, and the passages 159, 16.
9 on the pressure chamber 170b, and the diaphragm 172 is accordingly displaced upward in FIG. The drive rod 175 and the drive member 1 accordingly
67 is moved upward in FIG. 6, and the swinging rod 164 is rotated upward in FIG. 6 about the pin 165. Therefore, the outlet 2 of the pilot nozzle 163
60 opens, and the air in the working chamber 158 flows into the pressure chamber 170.
a, and the force pressing the valve body 167 against the valve seat 155 decreases. Therefore, the valve body 156 is pushed by the pressure within the valve hole 154 and deflects in a direction away from the valve seat 155, so that the valve hole 154 is communicated with the space 157. Thereby, from the valve hole 154 to the space 15
7. Air is discharged into the discharge space 160 through the nozzle 159
Air is discharged into the facepiece 10 from the discharge space 160. Therefore, intake is smooth.

Assume that during exhalation, the inside of the face piece 10 has a positive pressure of, for example, +38 mmH ₂ O or more. In this case, the pressure chamber 170b becomes positive pressure, the diaphragm 172 is displaced downward in FIG. 6, and the drive rod 1
75 and drive member 167 are displaced downward in FIG. Therefore, the swinging rod 164 is connected to the pin 165.
6, thereby closing the discharge port 260 of the pilot nozzle 163. Therefore, the pressure inside the working chamber 158 increases, and the valve body 15
6 is prevented from separating from the valve seat 155.
Therefore, the valve hole 154 is cut off from the space 157,
Air blowout is stopped. In this way, the face piece 1
The supply of air to the facepiece 10 is interrupted or supplied depending on the pressure change caused by breathing inside the facepiece 10.

The pressure chamber 170b is formed at a position far away from the nozzle 159 and the pilot nozzle 163, and the discharge space 160 is separated from the cover 178.
Since the dynamic pressure of the air discharged from the nozzle 159 and the nozzle 163 is not directly applied to the pressure chamber 170b, the operation of the diaphragm 172 is stabilized. Also, main body 1
Parts are also formed in the portion of 44 that enters into the face piece 10, allowing the pulmonary force valve to be formed compactly.

When conducting an airtight test of the open respirator,
The operating knob 304 is angularly displaced in the direction of arrow 404 in FIG. As a result, the contact surface 38 of the pawl 346
4 is displaced to the left in FIG.
It drops to 74. Therefore, due to the spring force of the second spring 402, the movable body 306 is displaced downward as shown in FIG. 6 and becomes the state shown in FIG. 9. As a result, the first spring 176 weakens or ceases to exert the spring force that displaces the diaphragm 172 upward in FIGS. 6 and 9. As described above, the diaphragm 172 has the downward elastic force shown in FIGS. 6 and 9 that resists the first spring 176. The drive rod 175 is displaced against the force or by applying a force in the direction of displacing the first spring 176, which has ceased to exert its spring force, downward in FIGS. 6 and 9. Therefore, the swinging rod 164 comes into contact with the pilot nozzle 163, and the discharge port 260 of the pilot nozzle 163 is closed. In this way, the airtightness test of open respirators can be performed.

The stopper 342 fits into the elongated hole 318, thereby limiting the amount of angular displacement of the operating knob 304. A guide protrusion 370 fits into the notch 312,
As a result, the movable body 306 will not be angularly displaced regardless of the angular displacement of the operating knob 304.

There is an O between the operation knob 304 and the mounting body 302.
A ring 406 is interposed. Therefore, the operating knob 304 is prevented from being undesirably angularly displaced due to the frictional force of the O-ring 406. In addition, sewage and dirt are prevented from entering through the gap between the operating knob 304 and the mounting body 302.
Furthermore, by preventing the intrusion of dirt, smooth rotation of the operating knob 304 is ensured. In addition, due to the elastic force of the O-ring 406, the operating knob 304
can rotate through an angular displacement coaxially with the guide wall 308 of the mounting body 302, which also allows the operation knob 304 to be rotated smoothly.

Referring again to FIGS. 3 and 4, the pulmonary force valve 8
The main body 144 is provided with a bypass valve 185 for introducing air into the face piece 10 by bypassing the aforementioned valve hole 154. A valve hole 186 of the bypass valve 185 is formed to communicate with the flow path 151. The valve hole 186 opens into a valve chamber 187, and a valve body 189 is inserted into the valve chamber 187 to abut against a valve seat 188 of the valve hole 186.
is provided. The valve body 189 is fixed to one end of a drive rod 190 that is slidable within the valve chamber 187 along the axis of the valve hole 186 . The drive rod 190 is screwed into the main body 144 in the middle, and has a knob 1 at the other end.
91 is fixed. By rotating the knob 191, the drive rod 190 is screwed forward or backward within the valve chamber 187, and the valve hole 186 is opened and closed by the valve body 189 accordingly. A hole 192 opening into the valve chamber 187 communicates with the aforementioned nozzle 159 via a flow path 193. Therefore, in the case of an emergency in which the pulmonary force valve 8 fails and does not function satisfactorily, the bypass valve 185 can be opened to introduce air into the face piece 10.

FIG. 10 is a partially cutaway side view of the face piece 10. The face piece 10 is fixedly attached to the human head by fastening the band 195.
A transparent eyepiece 194 is provided on the front surface of the face piece 10, thereby ensuring a field of view.
A breathing air chamber 266 is integrally provided in the face piece 10, and a flexible barrier 193 is provided at the bottom of the face piece 10 to cover the mouth and nose of the person wearing the face piece 10. Breathing chamber 196
is formed. The respiratory air chamber 266 has a connecting hole 203 having an internal thread 197 for screwing the pulmonary force valve 8.
is formed, and a pulmonary force valve 8 is formed on this internal thread 197.
A screw member 180 is screwed. By this,
Air supplied from the lung force valve 8 is introduced into the space formed by the facepiece 10 and the head of the human body outside the breathing chamber 196. Referring to Figure 11,
A cylindrical member 199 having a valve hole 198 is provided on the side of the partition wall 193, and a valve body 200 is inserted into the cylindrical member 1.
Supported by 99. This valve body 200 has flexibility, and when the inside of the breathing chamber 196 becomes negative pressure during inhalation, it bends as shown by the imaginary line and closes the valve hole 196.
8 is opened. During exhalation, the valve body 200
The valve hole 198 is closed as shown in FIG. 11, and air circulation is cut off.

A valve hole 201 is formed in the lower part of the breathing air chamber 266, and an exhalation valve 9 is provided to close the valve hole 201.
is provided. This exhalation valve 9 has flexibility and is biased by a spring from the atmospheric pressure side, and when the pressure inside the breathing chamber 196 becomes a positive pressure greater than the spring force, the valve hole 2
It has a function of opening the valve hole 201 and closing the valve hole 201 when a positive pressure or negative pressure is smaller than the spring force. Therefore, the opening and closing functions of the valve body 200 and the exhalation valve 9 are opposite to each other, and air is supplied into the breathing chamber 196 during air supply, and exhaled air is discharged from the breathing chamber 196 during exhalation.

As described above, according to the present invention, when the spring force of the spring biasing the diaphragm is released, the pilot nozzle is occluded by the elastic force of the diaphragm, so that the pulmonary force valve of the present invention You will be able to accurately perform air tightness tests on the respiratory equipment being used. Also, wasteful loss of intake gas is prevented.

[Brief explanation of the drawing]

FIG. 1 is an overall front view of an embodiment of the present invention, FIG. 2 is a simplified system diagram of the open-air respirator 1, and FIG.
The figure is a partially cutaway sectional view of the rotary joint 124 and the pulmonary force valve 8, FIG. 4 is a plan view of FIG. 3, and FIG.
6 is a sectional view taken from the cutting plane line - in FIG. 4, FIG. 7 is an exploded perspective view of the mounting body 302, operation knob 304, and movable body 306, and FIG. 8 is a view with the cover 178 removed. is the claw 346 and the recess 3
72, FIG. 9 is a sectional view showing another operating state corresponding to FIG. 6, FIG.
The figure is a sectional view of a valve body 200 provided on the face piece 10. 1...Releasable breathing apparatus, 2...Pressure vessel, 3...
Attaching means, 4... Container valve, 5... Pressure reducer, 6...
Connection means, 8... Pulmonary force valve, 10... Facepiece, 154
... Valve hole, 156 ... Valve body, 158 ... Actuation cylinder,
160...Discharge space, 163...Pilot nozzle, 164...Swinging rod, 170a, 170b...
Pressure chamber, 172...Diaphragm, 175...Drive rod, 176...First spring, 302...Mounting body,
304...Operation knob, 306...Moving object, 30
8... Guide wall, 312... Guide notch, 318
...Elongated hole, 346 ...Claw, 360 ...Inner cylinder, 36
2... Outer cylinder, 364... Top, 350... Spring receiver, 372... Recess, 374... Release notch,
402...Second spring.

Claims (1)

[Claim for Utility Model Registration] A diaphragm is operated in response to pressure changes associated with human breathing, and a valve body responsive to the diaphragm is displaced toward the pilot nozzle to open and close the pilot nozzle. In a pulmonary force valve for a respiratory device that opens and closes a valve hole in the middle of an inspiratory gas flow path to control the supply of inspiratory gas, a spring biases a diaphragm in a direction in which the valve body opens a pilot nozzle. and a means for releasing the spring force of the spring, and the diaphragm has an elastic force in a direction in which the valve body closes the pilot nozzle.