阅读说明：本技术 呼吸用保护件的正压排气阀 (Positive pressure exhaust valve of protective piece for breathing ) 是由 斋藤航 小野研一 井出弘之 于 2018-03-15 设计创作，主要内容包括：本发明提供一种正压排气阀,其为当面罩体的内部达到规定压力时打开的呼吸用保护件的正压排气阀,具备阀体和始终抵接于阀体而对阀体向闭阀方向施力的弹簧,阀体和弹簧所形成的振动体的自激振动被抑制。本发明是当面罩体的内部达到规定压力时打开的呼吸用保护件的正压排气阀,具备：阀体；第一弹簧,其始终抵接于阀体而对阀体向闭阀方向施力；以及制动体,其从阀体隔开间隙而与阀体对置,当阀体和第一弹簧所形成的振动体自激振动时,抵接于阀体而抑制自激振动。(The invention provides a positive pressure exhaust valve of a respiratory protection member which is opened when the interior of a mask body reaches a predetermined pressure, the positive pressure exhaust valve is provided with a valve body and a spring which is always in contact with the valve body and applies force to the valve body in a valve closing direction, and self-excited vibration of a vibrating body formed by the valve body and the spring is suppressed. The present invention is a positive pressure exhaust valve of a respiratory protection device that opens when the interior of a mask body reaches a predetermined pressure, comprising: a valve body; a first spring which is always abutted against the valve body to apply force to the valve body in a valve closing direction; and a braking body facing the valve body with a gap therebetween, the braking body being configured to abut against the valve body to suppress self-excited vibration when a vibrator formed by the valve body and the first spring vibrates self-excited.)

1. A positive pressure exhaust valve of a respiratory protection member that opens when the interior of a mask body reaches a predetermined pressure, comprising: a valve body; a first spring which is always abutted against the valve body to apply force to the valve body in a valve closing direction; and a braking body facing the valve body with a gap therebetween, the braking body being configured to abut against the valve body to suppress self-excited vibration when a vibrator formed by the valve body and the first spring vibrates self-excited.

2. The positive pressure exhaust valve according to claim 1 wherein the braking body is a cylindrical elastomer.

3. The positive pressure exhaust valve according to claim 1 wherein the braking body is a second spring.

4. The positive pressure exhaust valve according to claim 3 wherein, with respect to the brake body, the spring constant of the second spring is set to a value larger than the spring constant of the first spring.

5. The positive pressure exhaust valve according to claim 3 or 4, wherein the second spring is a coil spring, an end portion of the coil spring on the side isolated from the valve body is engaged with a claw formed in the support member, and a tip end portion of the end portion is bent and inserted into a hole formed in the support member.

Technical Field

The present invention relates to a positive pressure exhaust valve of a respiratory mask that opens when the interior of a mask body reaches a predetermined pressure.

Background

Patent document 1 discloses a positive pressure exhaust valve of a respiratory mask member that opens when the interior of a mask body reaches a predetermined pressure.

Prior art documents

Patent document

Patent document 1, Japanese patent laid-open No. 2014-161356.

Disclosure of Invention

Problems to be solved by the invention

The positive pressure exhaust valve includes a valve body and a spring that is always in contact with the valve body and biases the valve body in a valve closing direction. When the respiratory protector is used, there is a possibility that some disturbance acts on a vibrating body formed by the valve body and the spring, and the vibrating body vibrates by self-excitation. When the self-excited vibration starts, the amplitude increases with the lapse of time, and abnormal noise is generated, which causes discomfort to the user of the respiratory protector.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a positive pressure exhaust valve of a respiratory protector that opens when the interior of a mask body reaches a predetermined pressure, the positive pressure exhaust valve including a valve body and a spring that constantly abuts against the valve body and biases the valve body in a valve closing direction, wherein self-excited vibration of a vibrating body formed by the valve body and the spring is suppressed.

Means for solving the problems

In order to solve the above problem, the present invention provides a positive pressure exhaust valve of a respiratory protection device that opens when the interior of a mask body reaches a predetermined pressure, the positive pressure exhaust valve including: a valve body; a first spring which is always abutted against the valve body to apply force to the valve body in a valve closing direction; and a braking body facing the valve body with a gap therebetween, the braking body being configured to abut against the valve body to suppress self-excited vibration when a vibrator formed by the valve body and the first spring vibrates self-excited.

Since the valve body is always biased in the valve closing direction by the first spring, the positive pressure exhaust valve is not opened as long as the internal pressure of the mask body does not reach the predetermined pressure. When the respiratory protection member normally operates, the braking member facing the valve body is not in contact with the valve body with a gap from the valve body, and does not interfere with the operation of the positive pressure exhaust valve. There is a possibility that some disturbance acts on the respiratory protection element and thus on the oscillating body formed by the valve body and the first spring, which oscillating body generates self-excited oscillation. When self-excited vibration starts, the vibration amplitude increases with time, and the valve body abuts against the brake body. If the valve body abuts on the braking body, a braking force acts on the vibrator, self-excited vibration stops, and abnormal sound caused by the self-excited vibration stops.

In a preferred embodiment of the present invention, the braking body is a columnar elastic body.

The structure of the positive pressure exhaust valve is simplified and the manufacturing cost of the positive pressure exhaust valve is reduced by using the braking body as the columnar elastic body.

In a preferred form of the invention, the braking body is a second spring.

Since the spring constant of the columnar elastic body is generally much larger than that of the first spring, the displacement of the valve body is restricted by the columnar elastic body. As a result, when the breathing of the user of the respiratory guard is rapid beyond the normal level, the valve body abuts against the brake body to restrict the movement, which may cause a problem that the positive pressure exhaust valve cannot be opened to a level corresponding to the rapid breathing. The valve body is displaceable after coming into contact with the second spring by using the braking body as the second spring and the spring constant of the second spring as an appropriate value, whereby the opening degree of the positive pressure exhaust valve can be increased to a level corresponding to the respiration while suppressing self-excited vibration of the vibrator and when the respiration of the user of the respiratory protector is hurried.

In a preferred embodiment of the present invention, the spring constant of the second spring is set to a value larger than the spring constant of the first spring.

The spring constant of the second spring is set to a value larger than that of the first spring, and the braking force applied from the second spring to the oscillating body formed by the valve body and the first spring is increased, whereby the self-excited oscillation of the oscillating body can be effectively stopped.

In a preferred aspect of the present invention, the second spring is a coil spring, an end portion of the second spring on a side isolated from the valve body is engaged with a claw formed in the support member, and a tip end of the end portion is bent and inserted into a hole formed in the support member.

Coil springs are readily available and are suitable for the second spring. When a coil spring is used as the second spring, it is necessary to lock an end portion of the coil spring on the side isolated from the valve body to the support member. It is an effective locking method to engage the end of the coil spring on the side isolated from the valve body with the claw formed on the support member. The engaging portion of the end portion of the coil spring with the pawl needs to be limited to the flat portion of the end portion. If the engaging portion is separated from the flat portion and becomes an inclined portion, the coil spring is inclined and biased to touch the valve body (tab た り), and the self-excited vibration suppression function is impaired. The end portion is bent at its distal end and inserted into a hole formed in the support member, and the coil spring and the pawl are fixed in relative positions in the circumferential direction, whereby the flat portion of the end portion of the coil spring can be reliably engaged with the pawl.

Drawings

Fig. 1 is an exploded perspective view of a respiratory protector provided with a positive pressure exhaust valve according to an embodiment of the present invention;

Fig. 2 is an exploded perspective view of a respiratory protector provided with a positive pressure exhaust valve according to an embodiment of the present invention;

Fig. 3 is a sectional view of the positive pressure exhaust valve according to the embodiment of the present invention.

Detailed Description

A positive pressure exhaust valve of a respiratory protection device according to an embodiment of the present invention will be described.

As shown in fig. 1 to 3, the respiratory protector a includes a mask body B. A circular opening B1 is formed in one side portion of the mask body B, and an annular exhaust valve support member C is inserted through the opening B1 from the inside of the mask body B and fixed to the mask body B.

The positive pressure exhaust valve 1 covers the opening B1 from the outside of the mask body B, and is fixed by being engaged (ス ナ ッ プ fitted め) with the exhaust valve support member C via an annular seal member D.

The positive pressure exhaust valve 1 includes an exhaust valve seat 2. The exhaust valve seat 2 includes: an annular valve seat forming body 2 a; a plurality of claws 2b for fastening the valve seat forming body 2a to the exhaust valve support member C, the claws being formed in the valve seat forming body 2a in a plurality at intervals in the circumferential direction; a cylindrical bearing 2c disposed at the center of the ring formed with the valve seat forming body 2a, through which a valve shaft of a valve body to be described later is inserted; a plurality of arm portions 2d that couple the cylindrical bearing 2c and the valve seat forming body 2 a; a pair of jaws 2e of a female portion of a bayonet (bayonet) type coupling mechanism; and a pair of concave portions 2f of the female portions of the lock mechanism.

The positive pressure exhaust valve 1 includes a valve body 3. The valve body 3 includes: a disc-shaped flexible valve body 3a formed of silicone rubber; a rigid plastic valve shaft 3b disposed concentrically with the valve body 3 a; and an annular spring support 3c made of hard plastic and disposed concentrically with the valve main body 3 a. The spring support 3c has a circular plate 3c₁And in the annular plate part 3c₁A cylindrical portion 3c formed on the inner peripheral portion of the cylindrical portion₂. The valve body 3a, the valve shaft 3b, and the spring bearing 3c are integrally formed by insert molding.

The positive pressure exhaust valve 1 includes a first coil spring 4. The two end portions of the first coil spring 4 form flat surfaces extending perpendicular to the longitudinal direction and parallel to each other. One end of the first coil spring 4 is externally fitted to the cylindrical portion 3c of the spring bearing 3c₂And abuts against the annular plate part 3c₁。

The positive pressure exhaust valve 1 includes a second coil spring 5 disposed concentrically with the first coil spring 4. The second coil spring 5 is formed to be smaller in diameter than the first coil spring 4 and shorter than the first coil spring 4. The second coil spring 5 is disposed inside the first coil spring 4. The spring constant of the second coil spring 5 is set to be larger than that of the first coil spring 4The value of (c). The second coil spring 5 functions as a braking body of a vibrating body formed by the valve body 3 and the first coil spring 4. The two end portions of the first coil spring 4 form flat surfaces extending perpendicular to the longitudinal direction and parallel to each other. One end of the second coil spring 5 extends from the spring support cylindrical portion 3c of the valve main body 3a₂The portion extending inside of (b) faces the portion with a predetermined gap therebetween. The tip 5a of the other end portion of the second coil spring 5 is bent in the longitudinal direction.

The positive pressure exhaust valve 1 includes a spring retainer 6. The spring holder 6 includes: a truncated cone-shaped peripheral side wall 6 a; a top wall 6 b; a claw 6c of a male part of a bayonet coupling mechanism formed by the front end parts of a pair of leg parts extending from the peripheral side wall 6 a; a pair of male claws 6d of the lock mechanism formed by the front ends of the other pair of legs extending from the peripheral side wall 6 a; a cylindrical portion 6e formed on the inner surface of the top wall 6 b; three second spring retaining claws 6f formed inside the top wall 6b at intervals from each other in the circumferential direction; and a second spring positioning small-diameter through hole 6g formed in the top wall 6 b.

The spring retainer 6 and the exhaust valve seat 2 are detachably connected by a bayonet coupling mechanism formed by a female claw 2e and a male claw 6c that can engage with and disengage from each other and pressed and screwed, and the connected state is stably maintained by a lock mechanism formed by a male claw 6d and a female recess 2f that can engage with and disengage from each other.

The other end portion of the first coil spring 4 is fitted to the cylindrical portion 6e on the rear surface of the ceiling wall 6b of the spring holder 6 and abuts on the rear surface of the ceiling wall 6 b. The first coil spring 4, which has both ends sandwiched between the valve body 3 and the spring retainer 6, biases the valve body 3 in the valve closing direction, and brings the valve main body 3a into contact with the valve seat forming body 2 a.

The second coil spring 5 is engaged with the spring holder 6 in a state where the other end portion forming the flat surface of the second spring 5 is engaged with the three engaging claws 6f on the back surface of the ceiling wall 6b and the tip end 5a of the other end portion of the second spring 5 is inserted into the small-diameter through hole 6g penetrating through the ceiling wall 6 b. As described above, the second coil spring 5 has one end portion extending from the spring support member cylindrical portion 3c of the valve main body 3a₂Extending insideThe portion is opposed to the aforementioned portion with a predetermined gap. The predetermined value of the clearance is determined by grasping the displacement of the valve body 3 when the positive pressure exhaust valve 1 is normally operated and the displacement of the valve body when self-excited vibration occurs by a real machine test.

The positive pressure exhaust valve 1 includes a cover member 7. The cover member 7 includes a circular truncated cone-shaped peripheral side wall 7a and a top plate 7b fixed to the peripheral side wall via a plurality of arm members. An annular gap 7c divided into a plurality of parts by the arm member is formed between the top plate 7b and the peripheral side wall 7 a.

The cover member 7 is coupled to the exhaust valve seat 2 via a hinge mechanism 8 so as to be openable and closable. The closed state of the lid member 7 is releasably maintained via the engagement mechanism 9.

The operation of the positive pressure exhaust valve 1 will be explained.

The respiratory protector a is a respiratory protector with an electric fan as follows: the internal pressure of the mask body B is always kept at a positive pressure, and only when the user inhales air, external air is supplied to the mask body B via the electric fan.

When the user exhales, if the interior of the mask body B reaches a predetermined pressure, the valve body 3 moves in the valve opening direction against the biasing force of the first coil spring 4, and the positive pressure exhaust valve 1 opens. As a result, the exhaled air in the mask body B is discharged to the external environment.

When the respiratory protector a is used smoothly and the user does not breathe very quickly, the valve element 3 does not abut against the second coil spring 5 when the user exhales, and the valve element 3 is opened and closed by the biasing force of the first coil spring 4 and the biasing force caused by the mask body internal pressure.

There is a possibility that some disturbance acts on the respiratory protection member a and further on the vibrating body formed by the valve body 3 and the first coil spring 4, which vibrates by self-excitation. When the self-excited vibration starts, the amplitude increases with time, and abnormal noise is generated, which gives a sense of discomfort to the user of the respiratory protector a. However, in the positive pressure exhaust valve 1, if the amplitude of the self-excited vibration of the vibrator formed by the valve body 3 and the first coil spring 4 increases, the valve body 3 abuts against the second coil spring 5 as the braking body, the braking force acts on the vibrator from the second coil spring 5, the self-excited vibration stops, and the abnormal sound stops. As is understood from the above description, in the positive pressure exhaust valve 1, the self-excited vibration of the vibrating body formed by the valve body 3 and the first coil spring 4 is suppressed.

In the second coil spring 5, there are advantages as follows: when the positive pressure exhaust valve 1 normally works, the second spiral spring 5 is not abutted against the valve body 3, and the normal work of the positive pressure exhaust valve 1 is not interfered and is not hindered.

Since the spring constant of the second coil spring 5 is set to a value larger than that of the first coil spring 4, the braking force applied from the second coil spring 5 to the vibrating body formed by the valve body 3 and the first coil spring 4 is large. As a result, the self-excited vibration of the vibrator can be effectively stopped.

It is desirable that the spring constant of the second coil spring 5 as the braking body is appropriately set, and the valve body 3 can be displaced in the valve opening direction even after coming into contact with the second coil spring 5. When the self-excited vibration of the vibrator formed by the valve body 3 and the first coil spring 4 is suppressed and the breathing protector user breathes particularly abruptly, the opening degree of the positive pressure exhaust valve 1 can be increased to a level corresponding to the breathing.

The easily available second coil spring 5 is suitable for use as a braking body for the oscillating body formed by the valve body 3 and the first coil spring 4. In this case, it is necessary to lock the other end portion of the second coil spring 5, which is apart from the valve body 3, to the spring holder 6. The other end portion of the second coil spring 5, which is isolated from the valve element 3, is engaged with the claw 6f formed in the spring holder 6, which is an effective locking method. The engaging portion with the claw 6f at the other end portion of the second coil spring 5 needs to be limited to the flat portion at the other end portion. If the engaging portion is separated from the flat portion and becomes an inclined portion, the second coil spring 5 is inclined and obliquely contacts the valve body 3, and the self-excited vibration suppression function is impaired. The distal end 5a of the other end portion is bent and inserted through the small-diameter hole 6g formed in the spring holder 6, and the second coil spring 5 and the claw 6f are fixed in relative positions in the circumferential direction, whereby the flat portion of the other end portion of the coil spring can be reliably engaged with the claw 6 f.

Instead of the second coil spring 5, a hard or soft columnar elastic body may be used as a braking body of the oscillating body formed by the valve body 3 and the first coil spring 4. By using the braking body as a columnar elastic body, the structure of the positive pressure exhaust valve 1 is simplified, and the manufacturing cost of the positive pressure exhaust valve 1 is reduced. However, since the spring constant of the columnar elastic body is generally much larger than that of the first coil spring 4, when the valve element 3 comes into contact with the columnar elastic body, the displacement of the valve element 3 is restricted by the columnar elastic body. As a result, when the breathing of the respiratory protector user is particularly rapid, the valve element 3 abuts against the columnar elastic body to restrict the movement, and there is a possibility that the positive pressure exhaust valve 1 cannot be opened to such an extent as to correspond to the rapid breathing.

Industrial applicability

The present invention can be widely applied to a positive pressure exhaust valve of a respiratory protection member.

Description of the symbols

Protective member for A breathing

b mask body

C exhaust valve support member

D sealing part

1 positive pressure exhaust valve

2 exhaust valve seat

3 valve body

4 first coil spring

5 second coil spring

6 spring pressing piece

7a cover member.