JPH084634B2 - Exhalation valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhalation valve which is provided on a face piece of a respiratory organ and discharges exhaled air in the face piece by expiratory pressure.

[0002]

2. Description of the Related Art A typical prior art is, for example, Japanese Patent Publication No.
3-16240 (Japanese Patent Laid-Open No. 52-87890). In this prior art, a valve rod is fixed to the valve body, and the valve rod is inserted through a central sleeve as a guide cylinder and guided so as to be displaceable in the axial direction. Therefore, the outer peripheral surface of the valve rod is in contact with the inner peripheral surface of the central sleeve at a part in the circumferential direction, and the outer peripheral surface and the inner peripheral surface are separated from each other with a slight gap in the remaining portion. , When the valve body is displaced by breathing, rattling or vibration is likely to occur in the valve body due to disturbance of exhalation, etc., and there are cases where the valve body does not open and close smoothly, resulting in poor responsiveness. is there.

Further, in the above-mentioned prior art, the rigid disc corresponding to the flange of the present invention has a larger diameter than the valve seat and the valve disc, so that the valve disc is supported by the rigid disc when inhaled. Since it abuts against the valve seat, even if there is a slight error in the thickness of the valve body, the airtightness is greatly reduced, and there is a problem that harmful gas or the like is sucked into the face body from the outside.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent rattling of the valve body even when the breath is disturbed, and to improve the stability of the valve body when opening and closing, and An object of the present invention is to provide an exhalation valve capable of improving airtightness when a valve body is seated on a valve seat.

[0005]

According to the present invention, a valve body which is provided on a face body to which breathing gas is supplied by suction and which is flexible and elastic by a return spring is elastically directed toward a valve seat. In the exhalation-valve in which the valve body is opened by opening the valve hole by abutting against the valve hole to close the valve hole and exhaling the valve body against the spring force of the return spring, the cross section perpendicular to the member axis is formed into a polygon. And a valve rod protruding from one surface facing the valve hole of the valve body and integrally formed at one axial end of the valve rod, and having a diameter smaller than at least the valve seat and harder than the valve body. A flange, a holding body having a valve chamber in which the valve seat surrounds the valve hole and integrally formed, and having a valve chamber for accommodating the valve body; and a holding body fixed to the holding body and through which the valve rod is inserted. A guide cylinder having an insertion hole having a cylindrical inner peripheral surface, and one end of which is locked to the guide cylinder. A exhalation valve that other end, characterized in that it comprises a vibration-proof spring elastically abutting on the valve stem.

[0006]

According to the present invention, the valve rod is provided on one surface of the valve body so as to project therefrom. The valve rod is inserted into the insertion hole of the guide cylinder and guided according to the displacement of the valve body. Such a stem is
The cross section perpendicular to the member axis is formed in a polygonal shape, and the inner peripheral surface of the insertion hole of the guide tube is formed in a right cylindrical shape. This minimizes the contact area of the valve rod with the inner peripheral surface of the guide cylinder,
Sliding resistance when the valve body is displaced can be reduced. Further, since the vibration-proof spring comes into elastic contact with the valve rod, the valve rod is inserted in the insertion hole of the guide cylinder and is brought to the one side, so that the spring force of the vibration-proof spring is increased. It is possible to prevent the valve body from being easily displaced to the other side against the force, which prevents rattling of the valve element. Further, since the flange is formed integrally with the valve rod, there is no possibility of forming a gap between the valve rod and the flange, and thereby the airtightness is improved. Moreover, since the flange has a smaller diameter than the valve seat and is harder than the valve body, the peripheral edge portion of the valve body projects radially outward from the peripheral edge portion of the flange and is elastically displaceable. . Therefore, in such a state that the peripheral edge portion of the valve element is in contact with the valve seat, even if the thickness of the valve element is slightly different in the circumferential direction, the peripheral edge portion of the valve element surrounds the valve seat. It is possible to make uniform contact over the entire circumference in the direction, which improves the airtightness.

[0007]

1 is a cross-sectional view showing an exhalation valve 1 according to an embodiment of the present invention. For example, an exhalation valve 1 is provided on a face piece to which a breathing gas such as air is supplied, and the exhalation of the wearer of the face piece can be discharged by increasing the expiratory pressure in the face piece. Such an exhalation valve 1
A valve body 3, a holding body 5 having a housing space 4 in which the valve body 3 is housed, and a discharge direction A of exhaled air from one surface 6 of the valve body 3.
A valve rod 7 that is provided so as to project toward the upstream side, and a guide tube 9 that is formed with an insertion hole 8 through which the valve rod 7 is inserted and that is fixed to the holding body 5 by a plurality of ribs 14 (see FIG. 3). ,
A return spring 11 that elastically presses the valve element 3 toward the upstream side in the discharge direction A, one end of which is locked to the guide cylinder 9, and the other end of which is elastically attached to the valve rod 7. Anti-vibration spring 1 to abut
Including 3 and.

The valve element 3 is a substantially circular sheet-like member made of a flexible and elastic material such as rubber or silicon, and has a flange 15 integrally formed with the valve rod 7. A plurality of penetrating portions 1 penetrating through the through holes 16 of
The valve rod 7 and the flange 15 are prevented from being pulled out by a connecting portion 18 connecting the 7 and each penetrating portion 17. The valve rod 7 and the flange 15 are made of a material that is harder than the valve body 3, for example, synthetic resin.

The holding body 5 has an outer wall portion 19 formed of a pair of arc-shaped portions, an end plate 20 integrally formed by bending inward in the radial direction from one axial end portion of the outer wall portion 19, and an end. A cylindrical portion 2 that is integrally connected to an end portion of the plate 20 that is closer to the inner side in the radial direction and that forms a valve hole 23 by an inner peripheral surface 21 having a right cylindrical shape.
4, an annular valve seat 25 that is connected to the downstream side of the tubular portion 24 in the discharge direction A and is tapered toward the downstream side of the discharge direction A, and is attached to and detached from the other end side of the outer wall portion 19 in the axial direction. And a spring receiving piece 26 that is freely mounted.

The peripheral edge portion 3a of the valve body 3 is elastically abutted on the valve seat 25 over the entire circumference in the circumferential direction, and the outer diameter of the flange 15 is selected to be smaller than the inner diameter of the valve seat 25. There is. As a result, even if the thickness of the valve body 3 is non-uniform due to manufacturing errors or a slight wavy portion is generated due to strain or the like, the peripheral edge portion 3a of the valve body 3 has the valve seat 2
5 can be elastically abutted to achieve high airtightness when seated.

FIG. 2 is a front view of the exhalation valve 1 as seen from the left side of FIG. 1, and FIG. 3 is a side view of the exhalation valve 1 as seen from the right side of FIG. On the outer wall portion 19 of the holding body 5, locking claws 27a and 27b protruding outward in the radial direction from the tip end portion thereof are integrally formed at 180 ° intervals in the circumferential direction. Further, the spring receiving piece 26 is formed with a spring receiving recess 28 into which the other end of the return spring 11 is fitted and an opening facing the spring receiving recess 28 and having a diameter smaller than that of the return spring 11. And a fitting hole 31a, 31 formed integrally with the projection 30 into which the locking claws 27a, 27b are fitted.
b and a pair of locking leg portions 33a and 33b, and the locking leg portions 33a and 33 that are integrally formed on the protrusion 30.
The engaging claws 27a and 27b are fitted in the fitting holes 31a and 31b of the b.
Has a pair of support leg portions 34a, 34b elastically abutting the inward flange 20 of the holding body 5 at the free end portion extending downstream in the discharge direction A.

With the support legs 34a, 34b in contact with the inward flange 20 in this manner, the locking legs 33a,
Since 33b is locked to the locking claws 27a and 27b, there is no fear that the spring receiving piece 26 will be displaced with respect to the holding body 5, whereby the return spring 11 can be stably supported, It is possible to prevent an undesired change in the pressing force on the valve body 3 and to stably seat the valve body 3 on the valve seat 25 with a constant force.

FIG. 4 is a sectional view taken along the section line IV-IV of FIG. 1, and FIG. 5 is a perspective view of the vibration-proof spring 13 and its vicinity. The valve rod 7 has a polygonal cross section perpendicular to the member axis, and is a square in this embodiment. The inner peripheral surface 35 of the insertion hole 8 into which the valve rod 7 is inserted has a right cylindrical shape, and the inner peripheral surface 35 has two corner portions 36 of the valve rod 7.
a, 36b are in contact with each other, and the remaining two corners 36c,
36d is separated. As a result, when the valve body 3 is reciprocally displaced in the axial direction by breathing, the sliding resistance of the valve rod 7 with respect to the inner peripheral surface 35 is reduced, and the rattling or vibration of the valve body 3 due to the disturbance of exhalation or the like. It is possible to reliably prevent the occurrence of. Moreover, the other end 38 of the vibration-proof spring 13 elastically abuts on the one surface 37 of the valve rod 7, and the rotation of the valve body 3 is restrained by this, so that when the valve body is displaced, Vibration caused by rotation of the valve body can be prevented. Further, since relatively large spaces 39a to 39d are formed between the surface 37 of the valve rod 7 and the inner peripheral surface 35 of the guide cylinder 9, foreign matter such as airborne matter is unlikely to be clogged, and this also Further, the sliding resistance can be reduced and the valve body 3 can be displaced smoothly and stably in response to breathing.

In the above embodiment, the cross section perpendicular to the member axis of the valve rod 7 is a quadrangle, but other polygons such as a triangle or a pentagon may be used as another embodiment of the present invention. Any shape that requires a small contact area with the peripheral surface 35 can be appropriately selected.

[0015]

As described above, according to the present invention, the flange has a smaller diameter than the valve seat, and the peripheral edge portion of the valve body protruding from the flange is brought into contact with the valve seat. It is possible to improve the adhesion to the valve seat and obtain high airtightness. In addition, the cross section perpendicular to the member axis of the valve rod is polygonal,
Since the vibration-proof spring is elastically abutted to prevent the rotation of the valve body, it is possible to reliably prevent the vibration of the valve body caused by the rotation of the valve body.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an exhalation valve 1 according to an embodiment of the present invention.

FIG. 2 is a front view of the exhalation valve 1 as viewed from the left side of FIG.

FIG. 3 is a side view of the exhalation valve 1 as viewed from the right side of FIG.

FIG. 4 is a sectional view taken along the section line IV-IV in FIG.

FIG. 5 is a perspective view of the vibration-proof spring 13 and its vicinity.

[Explanation of symbols]

 1 Exhalation valve 3 Valve body 4 Storage space 5 Retainer 6 One surface 7 Valve rod 8 Insertion hole 9 Guide cylinder 11 Return spring 13 Anti-vibration spring 23 Valve hole 25 Valve seat 26 Spring receiving piece 35 Inner peripheral surface 36a-36d Corner corner Part 39a-39d space

Claims (1)

[Claims] 1. A valve body provided on a face body to which breathing gas is supplied by suction and elastically abutting a flexible and elastic valve body toward a valve seat by a return spring to form a valve hole. In an exhalation valve in which the valve body is opened by opening and closing the valve body against the spring force of the return spring by closing and exhaling, the cross section perpendicular to the member axis is formed into a polygon, and the valve hole of the valve body is formed. And a flange that is integrally formed on one end portion in the axial direction of the valve rod and that is protruded on one surface facing the valve seat and that has a smaller diameter than at least the valve seat and is harder than the valve body; A holding body that is integrally formed to surround the valve hole and has a valve chamber that accommodates the valve body; and a right cylindrical inner peripheral surface that is fixed to the holding body and through which the valve rod is inserted. A guide cylinder having an insertion hole, one end of which is locked to the guide cylinder and the other end of which is attached to the valve rod. Exhalation valve, characterized in that it comprises an abutting vibration-proof spring voluntarily.