KR200154899Y1 - Exhaust valve of air breathing apparatus convertible inhalation state to exhaust state - Google Patents

Abstract

The present invention relates to an exhaust valve of a compressed air type air respirator used in an industrial site, a fire site or a place where there is a risk of harm to human body due to breathing in an oxygen deficiency place, and in particular, a situation where the air respirator is worn And it is directed to the structure improvement of the exhaust valve for the air respirator to prevent unnecessary consumption of the compressed air by selectively switching to the intake, exhaust state to breathe air in the air during movement, the present invention is formed in the valve body The disk-shaped piston opens and closes the exhaust hole, but the piston forms an inclined surface inward so that the exhaust gas passing through the exhaust hole is easily discharged out of the main body, so that foreign matters are increased by the exhaust gas containing a large amount of humidity in the valve. Prevents sticking to maintain cleanliness and, of course, The cam guider, cam housing, and adjusting handles which are made smoothly and convert the operation of the piston into the intake and exhaust states are firmly assembled to each other so that the intake and exhaust state can be switched to the intake and exhaust state. It is characterized by providing a valve structure.

Description

Structure of exhaust valve for air respirator which can switch to intake and exhaust

The present invention relates to an exhaust valve of a compressed air type air respirator used in an industrial site, a fire site or a place where there is a risk of harm to human body due to breathing in an oxygen deficiency place, and in particular, a situation where the air respirator is worn And it relates to the structural improvement of the exhaust valve for the air respirator to prevent unnecessary consumption of the compressed air because the selective switching control to the intake, exhaust state to breathe the air in the air during movement.

In general, the air respirator is used for life-saving workers (fire fighters) such as industrial sites, manholes in mine shafts, and mines where harmful gases and dust are generated, and fire sites, to prevent inhalation of toxic gases to the wearer. By forming an intake valve and an exhaust valve on the surface, the compressed air stored in the compressed air storage tank is supplied to the inside of the surface through the intake valve, and after inhaling the air, the exhaust gas is discharged through the exhaust valve.

However, such an air respirator does not allow the exhaust valve to inhale air in the atmosphere. Therefore, in the process of waiting for life-saving workers (fire fighters) to the rescue site while wearing the air respirator. In order to prevent unnecessary consumption of the air in the compressed air storage tank and to prevent this, the air respirator must be worn in the state of arriving at the rescue site, which causes a delay in the rescue operation.

Therefore, due to the disadvantages of the air respirator has been disclosed a number of exhaust valves for the air respirator that can be switched to the intake and exhaust state, these are a number of utility model registration application No. 94-27576 previously filed by the applicant The lift finger with the opening / closing control body and the pressing plate assembled on both sides is inserted into the slide tube, and the pressing plate and the lift finger are elastically installed inside the cam housing by a spring and fastened to the lift finger. By the cam operation by the left and right rotation of the selection handle, the opening / closing control body is separated from the exhaust hole to switch to the intake and exhaust states.

When the exhaust valve is used in the exhaust state, when the pressure of the exhaust gas is increased due to the respiration in the surface, the opening and closing regulator is activated and the exhaust hole is opened to exhaust the exhaust gas. Since the selection handle rotates left and right, the cam is operated to lift the lift finger, the pressing plate, and the opening / closing control plate by compressing the spring, and the exhaust hole is opened to use to breathe air in the atmosphere.

However, such an exhaust valve is not easily guided to the vent hole by the opening / closing control member as the exhaust gas passes through the exhaust hole in a state containing a large amount of humidity, and thus the exhaust valve is not smoothly discharged. As the exhaust air remains in the valve, foreign matter such as dust is accumulated in the valve due to the moisture, and thus the inside of the valve cannot be kept clean. In addition, since the exhaust gas is easily introduced into the insertion tube, foreign matters are accumulated on the insertion tube, so that the operation of the pressing plate is not smoothly performed, and the exhaust operation of the valve and the suction and exhaust switching operation of the valve are not easy. .

In addition, the cam-operated selection handle, the lift finger, and the pressing plate are mutually coupled in the longitudinal direction so that they do not have a firmly coupled state, and thus have a problem in that they do not provide robustness due to frequent failures.

The present invention has been made to solve the problems of the prior art described above, the disk-shaped piston is opened and closed operation of the exhaust hole formed in the valve body, but the exhaust gas is easy to pass through the exhaust hole by making the piston inclined inward Since it is discharged to the outside of the main body to prevent foreign substances from sticking up by the exhaust gas containing a large amount of humidity in the valve to maintain a clean state of course, the operation of the piston is made smoothly, and also the suction of the piston It is an object of the present invention to provide an exhaust valve structure for an air respirator that can be switched to an intake and exhaust state in which a cam guider, a cam housing, and a steering wheel for switching to an exhaust state are firmly assembled to each other to have rigidity according to use.

1 is a perspective view of the present invention,

2 is an exploded perspective view of the present invention,

Figure 3 is a cross-sectional configuration of the present invention,

4 and 5 is an operating state diagram of the present invention,

4 is an exhaust state in a situation;

5 is an intake state capable of breathing air in the atmosphere at the time of waiting for the situation.

* Explanation of symbols for main parts of the drawings

5: valve body 7: exhaust hole

10: adjusting handle 11a, 11b: bullet spring

15: piston 16: inclined surface

20: Cam Guider 22: Guide Slope Cam

24: projection 25: cam housing

27: cam projection 30: cover

Next will be described with respect to the technical configuration of the present invention described above.

That is, as shown in Figures 1 to 3, the exhaust valve structure for the air respirator which can be switched to the intake and exhaust states of the present invention, the valve body 5 has a plurality of vent holes on the exhaust hole 7 and the outer peripheral edges therein (8) is formed to open and close the exhaust hole (7) to switch to the suction and exhaust state by cam operation according to the rotation operation of the adjustment handle (10) on one side, the exhaust hole in the main body (5) The rubber cap 19 and the disk-shaped piston 15 forming the tapered surface 16 inwardly are coupled to one side of (7) to be installed in a shot by the ball spring 11a, but the piston 15 is to one side. A guide rod 18 having a tip cutout portion 17 that forms a locking step 17a at the tip is formed, and a locking step portion 21 for supporting the guide bar 18 is formed at the locking step 17a of the piston 15. Insert and install the cam guide 20 to the cam guide 20 is the guide inclination cap 22 and the projections at equal intervals on the outer periphery A cam housing 25 for forming a cam protrusion 27 guided by the guide inclined cam 22 to the outside thereof, and a slider groove corresponding to the protrusion 24 of the cam guide 20. The adjusting handles 10 forming the 12 are respectively supported by the stepped portions 32 of the cover 30 which are coupled to the main body 5 and screwed together.

At this time, between the cam guide 20 and the adjustment handle 10 is provided with a bullet spring (11b) to elastically support the cam guide 20, the cam housing 25 is the stop projection 28 on the circumference It is formed and assembled to be fixed in a state coupled to each other in the groove portion 33 inside the cover 30 corresponding thereto.

In addition, the adjusting handle 10 forms a guide protrusion 14 on the circumference, and forms a guide groove 34 to limit the guide protrusion 14 to be guided by a predetermined angle on the cover 30 coupled thereto. The steering wheel 10 is configured to be rotated for as many times as the cam operating section of the cam guide 20.

Reference numeral 22a denotes a fixing groove for fixing the cam protrusion 27 of the cam housing 25 in the guide inclined cam 22, and T denotes a face of the air respirator, respectively.

The operation of the present invention configured as described above will be described.

First, as shown in FIG. 4, in the case of using the exhaust valve of the present invention in an industrial site, a mine shaft, a fire site, and the like, the disk-shaped piston 15 and in particular a rubber cap 19 coupled thereto are When the pressure of the exhaust gas during breathing increases while being firmly in contact with the exhaust hole 7 inside the valve body 5 due to the elastic force of the elastic spring 11a, the piston 15 and the rubber The cap 19 is pushed out elastically so that the exhaust hole 7 is opened.

The exhaust gas discharged through the open exhaust hole 7 is guided along the tapered surface 16 of the piston 15 to be easily discharged through the vent hole 8 formed at the outer periphery of the valve body 5. do. As a result, the inside of the valve body 5 shortens the stay of the exhaust gas containing a large amount of water, thereby preventing foreign matter from being stuck by the moisture of the exhaust gas, thereby maintaining a clean state.

At this time, when the exhaust pressure is lowered simultaneously with the discharge of the exhaust gas, the piston 15 and the rubber cap 19 are repeatedly adhered to the exhaust hole 7 by the elastic force of the carbon spring 11a. .

Next, as shown in Figure 4 when the lifeguards (fire fighters) wearing the air respirator in the process of waiting for the situation to be sent to the rescue site by switching the exhaust valve of the present invention to the intake state to the air in the atmosphere It is used to suck, which is rotated when the adjustment handle 10, the cam guide 20 is coupled to the adjustment handle 10, the projections 24 are coupled to the slide groove 12 of the adjustment handle 10 at the same time Rotational operation.

When the cam guide 20 is rotated in this manner, the inclined guide inclined cam 22 formed at equal intervals on the outer periphery is cam-operated by the cam protrusion 27 of the cam housing 25 coupled to the outer side thereof. It slides to one side while pressing 11b.

At this time, since the cam housing 25 is fixedly fixed to the inside of the cover 30 and does not rotate, the cam guide 20 can be slid. The cam operating section of the cam guide 20 can be adjusted by the adjustment handle 10. The guide projection 14 of) is maintained at a constant cam operating distance by being restricted by a certain angle from the guide groove 34 on the cover 30.

Thus, when the cam guide 20 is slid to one side by the cam operation, the bullet spring 11a in a state that the locking step 17a of the piston 15 is supported by the locking step portion 21 of the cam guide 20. At the same time as the compression is sliding, the exhaust hole 7 of the valve body 5 is opened, so that the air in the air is sucked.

At this time, the exhaust gas containing a large amount of moisture discharged through the exhaust hole 7 of the valve body 5 flows into the guide rod 18, the cam guide 20, and the cam housing 25 of the piston 15. This will not be easy to prevent foreign matter from being stuck, as well as to maintain a smooth operation between each component accordingly.

In addition, in order to return the valve of the intake state to the exhaust state again, the adjustment handle 10 is rotated in the reverse direction so that the above-described cam operation is reversed, and the cam guide 20 is driven by the repulsive force of the shot springs 11a and 11b. And piston 15 is to be returned to the piston 15 is to be in close contact with the exhaust hole 7 of the valve body 5 is possible.

As described above, the exhaust valve for the air respirator, which can be switched to the intake and exhaust state of the present invention, is configured to open and close the disc-shaped piston through the exhaust hole formed in the valve body. Since the exhaust gas passing through is easily guided and discharged into the vent hole, foreign substances are prevented from sticking in the main body by the exhaust gas containing a large amount of humidity, thereby maintaining a clean state. The cam guider, cam housing, and adjusting handles, which slide and operate to switch to suction and exhaust states, are firmly assembled to each other to provide robustness, as well as to prevent foreign matter from accumulating by smooth discharge of the exhaust gas, thereby opening and closing the piston and cam. The cam operation of the guider will have an effect that is smoothly provided.

Claims (4)

The valve body 5 has a plurality of vent holes 8 formed on the outer periphery of the exhaust hole 7 and the inner side of the valve body 5 to open and close the exhaust hole 7 by cam operation according to the rotation operation of the adjustment handle 10 on one side. In order to switch to the suction and exhaust state, in the main body 5, a disk-shaped piston 15 is installed on the inner side of one side of the exhaust hole 7 by a ball spring 11a, and the piston 15 ) Forms a guide rod 18 having a tip cutout portion 17 that forms a locking jaw 17a at a tip end thereof, and a locking step portion (a) supporting the locking jaw 17a of the piston 15. 21, a cam guide 20 is formed to be inserted into the cam guide 20, and the cam guide 20 forms a guide inclined cap 22 and a protrusion 24 at equal intervals on the outer circumference thereof. The cam housing 25 forming the cam protrusion 27 guided by the 22 and the slider groove 12 corresponding to the protrusion 24 of the cam guide 20 are formed. The steering wheel 10 is coupled to the cam guide 20, and the adjustment handle 10 is installed in the carbine spring (11b) is installed by the coupling 30 is supported by the cover 30 is screwed with the main body 5, the adjustment handle 10 The air intake and exhaust valve structure for switching between intake and exhaust conditions, characterized in that configured to control the intake and exhaust by the cam operation of the cam guide 20 by the left, right and right movement. 2. The exhaust valve structure according to claim 1, wherein the piston (15) forms a tapered surface (16) inside the disc shaped body to guide the exhaust gas. 3. The exhaust valve according to claim 2, wherein the piston (15) is formed by combining a rubber cap (19) having a shape corresponding to the inside of the tapered surface (16). rescue. The guide groove (14) according to claim 1, wherein the adjusting handle (10) forms a guide protrusion (14) on a circumference and restricts the guide protrusion (14) to be guided by a predetermined angle to the cover (30) coupled thereto. 34) is formed so that the adjustment handle (10) is made so as to be rotated for as many times as the cam operating section of the cam guide 20, the exhaust valve structure for an air respirator capable of switching to the intake and exhaust state.