JP6294605B2 - Check valve - Google Patents

Description

  The present invention relates to a check valve used for an air supply part such as a lifesaving device provided with an air chamber.

  In general, there is a neck-type lifesaving device shown in FIG. The neck type lifesaving device 101 includes an air chamber 103 and a belt 105. The air chamber 103 is expanded by the inflow of gas and can increase buoyancy. The belt 105 enables the neck type lifesaving device 101 to be fastened and attached to the waist of the wearer.

  An air supply pipe 107 made of resin or the like is coupled to the air chamber 103 so that the wearer can supply air by attaching the free end of the air supply pipe 107 to the mouth. A check valve 109 is inserted and attached to the free end side of the air supply pipe 107 to seal leakage of air supply from the air chamber 103 through the air supply pipe 107.

  Therefore, the wearer can lift the head to the water surface with the buoyancy caused by the expansion of the air chamber 103.

  7 is a half cross-sectional view of the check valve, FIG. 8A is a partially omitted cross-sectional view of the state in which the supply air discharge port is correctly closed by the movable valve body, and FIG. It is sectional drawing of the one part omission of the state which inclined.

  As shown in FIGS. 7 and 8, the check valve 109 includes a valve housing 111, a valve movable body 113, and a spring 115.

  The valve housing 111 includes a cylindrical valve guide 117 on the supply air inlet 116 side and a valve seat 121 that extends from the supply air discharge port 119 in a tapered shape.

  The valve movable body 113 includes a valve base 125 including an intake passage 123, a valve stem 127, and an elastic sealing portion 129 made of rubber or the like.

  Therefore, when the wearer inserts the air supply pipe 107 and blows in the air from the air supply inlet 116 side of the check valve 109 as indicated by arrow A, the air supplied through the air supply passage 123 is elastic from the air supply outlet 119. The sealing portion 129 is reached. Due to the arrival of the air supply, the elastic sealing portion 129 receives pressure, and the valve movable body 113 moves in the cylinder axis direction against the urging force of the spring 115, and the outer peripheral edge 129a of the elastic sealing portion 129 and the valve seat Air is supplied into the air chamber 103 from between the space 121 and the air chamber 103 inflates.

  When the air pressure P in the air chamber 103 acts on the elastic sealing portion 127, the outer peripheral edge 129a of the elastic sealing portion 129 comes into close contact with the valve seat 121 as shown in FIG. 8A and functions as a check valve.

  However, in order to enable the movable valve body 113 to move in the cylinder axis direction with respect to the valve housing 111, there is some backlash between the valve base 125 of the movable valve body 113 and the valve housing 111. As shown in FIG. 8B, the movable valve body 113 is inclined and remains in the inclined state due to the friction between the outer peripheral edge 129a of the elastic sealing portion 129 and the valve seat 121, as indicated by an arrow B. There was a risk of air leakage from the air chamber 103.

JP 2006-15817 A

  The problem to be solved is that there is a possibility that the movable valve body may be inclined to cause air leakage from the air chamber.

In order to suppress the inclination of the movable valve body and to regulate the leakage of air from the air chamber, the present invention tapers from the cylindrical valve guide and the air supply / discharge port on the air supply / intake port side. And a valve housing with a valve seat that spreads over and a supply guide that is supported and guided in the valve guide so as to be movable in the direction of the cylinder axis, and that allows air supply from the supply air inlet side to the supply air discharge side. A valve base having an air passage, a valve stem extending from the valve base to the air supply / discharge port side, and an elastic seal attached to the valve stem and contacting / separating the valve / seat from outside the air supply / discharge port A movable valve body provided with a stopper, and interposed between the valve base portion and the valve housing in the cylinder axial direction to urge the movable valve body so that the elastic sealing portion is elastically applied to the valve seat. A spring to contact, The air supply from the provided Personality mouth was possible and the check valve from the air supply inlet side, the valve movable body, cylindrical in the air supply discharge ports are formed adjacent to the resilient sealing portion A shoulder that fits in an axial direction so as to be disengageable and ventilated, and the shoulder moves before the outer peripheral edge of the elastic sealing portion when moving so as to be fitted from the outside of the air supply / discharge port. It is characterized by having a guided peripheral edge portion that is guided in contact with the valve seat.

  Since the present invention is the above-mentioned means, the guided peripheral edge portion is guided by being brought into contact with the valve seat at the same time or earlier than the outer peripheral edge of the elastic sealing portion, and the inclination of the movable valve body can be suppressed. For this reason, the outer peripheral edge of the elastic sealing portion can be in close contact with the valve seat and function correctly as a check valve, thereby restricting air leakage from the air chamber.

(A) is a partially omitted cross-sectional view in a state where the air supply / discharge port is correctly closed by the movable valve body, and (B) is a partially omitted cross-sectional view in a state in which the valve movable body is temporarily inclined. is there. Example 1 It is a schematic sectional drawing which shows a valve | bulb base. Example 1 It is sectional drawing of an air supply discharge part. Example 1 It is sectional drawing which concerns on the modification of an air supply discharge port part. Example 1 It is sectional drawing which concerns on the other modification of an air supply discharge port part. Example 1 It is a general view of a neck-type life preserver. (Conventional example) It is a half sectional view of a check valve. (Conventional example) (A) is a partially omitted cross-sectional view in a state in which the air supply / discharge port is properly closed by the movable valve body, and (B) is a partially omitted cross-sectional view in a state in which the movable valve body is tilted. (Conventional example)

  The purpose of suppressing the inclination of the movable valve body and restricting air leakage from the air chamber is tapered from the cylindrical valve guide and the air supply / discharge port on the air supply / intake port side. A valve housing provided with a valve seat, and an air supply passage which is supported and guided in the valve guide so as to be movable in the cylinder axis direction and which allows air supply from the air supply inlet side to the air supply outlet side And a valve stem extending from the valve base to the air supply / discharge port side, and an elastic sealing portion attached to the valve stem and contacting / separating the valve seat from outside the air supply / discharge port And a valve movable body provided between the valve base portion and the valve housing in an axial direction to urge the valve movable body to elastically contact the elastic sealing portion with the valve seat. With spring The valve movable body includes a shoulder portion that is formed adjacent to the elastic sealing portion and is fitted to the air supply / discharge port so as to be detachable and ventilated in a cylinder axial direction. The shoulder portion includes a guided peripheral edge portion that is guided by contacting the valve seat at the same time or earlier than the outer peripheral edge of the elastic sealing portion on the opposite side of the elastic sealing portion in the cylinder axis direction. It is characterized by.

  The shoulder portion may include a tapered portion that extends from the guided peripheral edge portion to the valve stem, and the taper ratio of the tapered portion may be equal to that of the valve seat.

  The movable valve body has a structure in which the shoulder portion is loosely fitted to the air supply / discharge port, or a groove is formed in the shoulder portion, or a groove is formed in the air supply / discharge port, so that the ventilation is possible. It is good also as a structure to do.

  1A and 1B relate to a first embodiment of the present invention, in which FIG. 1A is a partially omitted cross-sectional view of a state where an air supply and discharge port is correctly closed by a movable valve body, and FIG. 1B is a temporary view of the movable valve body. FIG. 2 is a schematic cross-sectional view showing the valve base, FIG. 3 is a cross-sectional view of the supply air discharge port portion, and FIG. 4 is a modification of the supply air discharge port portion. FIG. 5 is a cross-sectional view according to another modification of the air supply / discharge port portion.

  The basic structure of the check valve 1 of this embodiment shown in FIG. 1 is the same as that of the check valve 109 shown in FIGS. 7 and 8, and the mounting position is also the air supply pipe 107 of the neck-type lifesaving device 101 shown in FIG. Attached in the same way. Therefore, this embodiment also uses FIG. 6 for the neckline type lifesaving device 101.

  As shown in FIG. 1, the check valve 1 of this embodiment also includes a valve housing 3, a movable valve body 5, and a spring 7.

  The valve housing 3 includes a cylindrical valve guide 11 on the supply air inlet 9 side and a valve seat 15 that extends from the supply air discharge port 13 in a tapered shape.

  The valve movable body 5 includes a valve base portion 17, a valve stem 19, and a packing 21.

  As shown in FIG. 2, the valve base 17 is configured by arranging four blade portions 23 in the radial direction at one end of the valve stem 19 in the axial direction. The valve base portion 17 is supported and guided in the valve guide 11 by the four blade portions 23 so as to be movable in the cylinder axis direction. This valve base portion 17 constitutes an air supply passage 25 that enables the air supply flow from the air supply / intake port 9 side to the air supply / discharge port 13 side between the four blade portions 23.

  The valve stem 19 extends from the valve base 17 toward the air supply / discharge port 13.

  The packing 21 as an elastic sealing portion is formed of an elastic body such as rubber and is attached to the other end portion of the valve stem 19. The packing 21 is configured such that an outer peripheral edge 21 a contacts and separates from the valve seat 15. The outer peripheral edge 21 a comes into elastic contact with the valve seat 15 to close the air supply / discharge port 13.

  The spring 7 is interposed between the valve base portion 17 and the valve housing 3 in the cylinder axial direction, and biases the valve movable body 5 toward the air supply / intake port 9 to elastically contact the packing 21 with the valve seat 15. It is.

  On the other hand, the characteristic part of the embodiment of the present invention is that the movable valve body 5 includes a shoulder portion 27 provided adjacent to the packing 21, and the shoulder portion 27 includes a guided peripheral edge portion 29.

  The shoulder portion 27 is formed continuously from the head portion 31 and the neck portion 33 for attaching the packing 21 and has a circular cross section. As shown in FIGS. 1 and 3, the shoulder portion 27 moves away from the air supply / discharge port 13 in the cylinder axis direction. It fits so that it can be vented.

  The movable valve body 5 has a structure in which the shoulder 27 is fitted to the air supply / discharge port 13 so as to allow ventilation, and the shoulder 27 is loosely fitted to the air supply / discharge port 13. That is, an appropriate gap 35 is formed between the shoulder portion 27 and the air supply / discharge port 13. The air supply / discharge port 13 has an inner peripheral surface and stably guides the shoulder portion 27.

  As the structure in which the shoulder portion 27 is fitted to the air supply / discharge port 13 so as to allow ventilation, a groove 37 in the cylindrical axis direction is formed in the shoulder portion 27 as shown in FIG. 4, or the air supply / discharge state as shown in FIG. It is good also as a structure which forms the groove | channel 39 of the cylinder axial direction in the exit 13. FIG.

  The guided peripheral edge 29 is formed at the end of the shoulder 27 opposite to the packing 21 in the cylinder axis direction. When the shoulder 27 of the movable valve body 5 is moved from the outside of the air supply / discharge port 13 so as to be fitted to the air supply / discharge port 13, the guided peripheral portion 29 comes first before the outer peripheral edge 21 a of the packing 21. 15 to be guided. The coefficient of friction between the guided peripheral edge 29 and the valve seat 15 is formed lower than the coefficient of friction between the packing 21 and the valve seat 15, and the guided peripheral edge 29 abuts on the valve seat 15. Then, it is configured to slide easily. For this reason, the valve stem 19 including the guided peripheral edge 29 side is formed of resin or the like. The material on the valve stem 19 side is not limited as long as the guided peripheral edge portion 29 slides easily when it comes into contact with the valve seat 15, and may be formed of metal or the like.

  As shown in FIG. 1, a tapered portion 41 is formed from the guided peripheral edge portion 29 to the valve stem 19. The taper ratio of the taper portion 41 is equal to that of the valve seat 15. However, the taper ratio of the taper portion 41 may be larger or smaller than that of the valve seat 15.

  Therefore, when the wearer inserts the air supply pipe 107 (FIG. 6) and blows in the air as shown by the arrow A from the side of the air supply inlet 9 of the check valve 1, the air supplied through the air supply passage 25 is supplied and discharged. It reaches the packing 21 from the outlet 13. The packing 21 receives pressure due to the arrival of the air supply, and the valve movable body 5 moves in the cylinder axis direction against the urging force of the spring 7, so that the air is supplied from between the outer peripheral edge 21 a of the packing 21 and the valve seat 15. Air is supplied into the air chamber 103 (FIG. 6), and the air chamber 103 expands.

  When the air pressure P in the air chamber 103 acts on the packing 21, the outer peripheral edge 21a of the packing 21 comes into close contact with the valve seat 15 as shown in FIG. 1A and functions as a check valve.

  When the movable valve body 5 is tilted and moved, in this embodiment, as shown in FIG. 1 (B), the guided peripheral edge portion 29 and the tapered portion 41 are guided in contact with the valve seat 15 to guide the shoulder portion 27. The outer periphery is fitted into the air supply / discharge port 13 and the state shown in FIG.

  Therefore, the outer peripheral edge 21a of the packing 21 is not tightly fixed to the valve seat 15 while the valve movable body 5 is tilted, and the outer peripheral edge 21a of the packing 21 can be properly brought into close contact with the valve seat 15. .

[Others]
The check valve 1 can be similarly used for a waist pouch type life preserver, other life preserver, and other than life preserver.

  When the shoulder 27 of the movable valve body 5 moves so that the shoulder 27 of the valve movable body 5 is fitted from the outside of the air supply / discharge port 13 to the air supply / discharge port 13, the guided peripheral portion 29 comes before the outer peripheral edge 21 a of the packing 21. The shape or the like is not particularly limited as long as it is guided by contacting the sheet 15. In the state shown in FIG. 1B, only the guided peripheral edge 29 may be guided by the valve seat 15.

DESCRIPTION OF SYMBOLS 1 Check valve 3 Valve housing 5 Valve movable body 7 Spring 9 Air supply inlet 11 Valve housing 13 Air supply outlet 15 Valve seat 17 Valve base 19 Valve stem 21 Elastic sealing part 21a Elastic sealing part Outer peripheral edge 27 Shoulder 29 Guided peripheral edge 41 Tapered part

Claims (3)

A valve housing provided with a cylindrical valve guide on the air supply inlet side and a valve seat extending in a tapered shape from the air supply discharge port;
A valve base having a supply passage that is supported and guided in the valve guide so as to be movable in the direction of the cylinder axis, and that allows an air supply flow from the supply intake port side to the supply air discharge port side. A movable valve body including a valve stem extending to the air supply / discharge port and an elastic sealing portion attached to the valve stem and contacting / separating the valve / seat from outside the air supply / discharge port;
A spring interposed between the valve base and the valve housing in a cylinder axis direction to urge the movable body to elastically contact the elastic sealing portion with the valve seat;
A check valve that enables air supply from a person's mouth from the supply air inlet side ,
The valve movable body includes a shoulder portion that is formed adjacent to the elastic sealing portion and is fitted to the air supply and discharge port so as to be movable in the cylinder axis direction and capable of being vented.
When the shoulder portion moves so as to be fitted from the outside of the air supply / discharge port, a guided peripheral edge portion which is guided in contact with the valve seat prior to the outer peripheral edge of the elastic sealing portion is the elastic seal. It is formed on the opposite side of the stopper in the cylinder axis direction,
A check valve characterized by that. The check valve according to claim 1,
The shoulder includes a tapered portion from the guided peripheral edge to the valve stem,
The taper rate of this taper part was formed equivalent to the valve seat,
A check valve characterized by that. The check valve according to claim 1 or 2,
The movable valve body has a structure in which the shoulder portion is loosely fitted to the air supply / discharge port, or a groove is formed in the shoulder portion, or a groove is formed in the air supply / discharge port, so that the ventilation is possible. With a structure to
A check valve characterized by that.

Images