JP2009148518A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve suitable for use in a blood flow path and an infusion flow path where a valve operation is stable. <P>SOLUTION: In the check valve, a valve body 4 provided with an elastic thin peripheral edge part 45 is disposed so as to interrupt a flow path; the flow path is opened by the elastic displacement of the thin peripheral edge part 45 of the valve body by a fluid pressure from one side of the flow path, and the thin peripheral edge part 45 is elastically restored and displaced to close the flow path when the fluid pressure disappears. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a check valve suitably used in a blood channel, an infusion channel, and the like.

  A check valve is used in a blood flow path or the like in the medical field so as to prevent backflow of blood or medicine.

  However, this type of check valve in the present situation has a risk that the return operation of the valve portion is not stable and a backflow may occur. In the case of the conventional product, it is considered that the valve body is arranged so as to plug a part of the flow path when the flow path is shut off, so that the return from the valve body is not smoothly performed. Normally, the valve body is integrally provided with a return elastic portion, but it has been difficult to design a fine part to have an appropriate elasticity at a precise value.

Problems to be solved by the invention

  An object of the present invention is to provide a check valve that can be suitably used in a blood flow path, an infusion flow path, and the like with stable valve operation.

Means for solving the problem

  In this invention, the valve body having a thin peripheral edge portion having elasticity is arranged so as to block the flow path, and the thin peripheral edge portion of the valve body is elastically displaced by the fluid pressure from one side of the flow path. Thus, the check valve is characterized in that when the flow path is opened and the fluid pressure is extinguished, the thin peripheral portion elastically returns and displaces to close the flow path.

  According to the check valve having the above configuration, when fluid pressure is applied from one side of the flow path, the thin peripheral edge of the valve body is elastically displaced to open the flow path, and when the fluid pressure disappears, The peripheral edge is elastically returned and displaced to close the flow path. The flow path is opened by the thin peripheral edge itself that is pushed and displaced by the fluid pressure, and the flow path is closed by the thin peripheral edge itself that elastically returns and displaces when the fluid pressure is lost, thereby simplifying the structure. A check valve mechanism that performs stable operation is obtained. Since there is no operation such as opening and closing of the plug by the movement of the valve body as in the prior art, no valve return failure occurs, and thus backflow is reliably prevented. The valve body is appropriately designed in terms of the shape of the thin peripheral edge, various dimensions, etc., corresponding to the fluid pressure, the shape of the mounting site, and the like. The peripheral edge may be the outer peripheral edge of the valve body or the peripheral edge of the hole provided.

The invention's effect

  According to the present invention, there can be obtained a check valve suitably used in a blood channel, an infusion channel, etc., in which valve operation is stable and backflow is prevented.

  FIG. 1 is a cross-sectional view taken along the flow path direction in the first embodiment of the check valve of the present invention, and FIG. The check valve 1 is entirely made of plastics, and includes a first tubular body 2 having an inlet-side flow path 1, a second tubular body 3 having an outlet-side flow path O, and a valve body 4 mounted inside the connection. Become.

  The first tubular body 2 is integrally provided with an annular flange 21 for connection in the vicinity of the end on the connection side, and a fitting convex edge 23 is formed continuously and integrally on the outer periphery of the flange 21. As shown in FIG. 2, the connection side surface 24 is provided with eight ribs 27 each having an inclined edge 25 on the front surface at an angle K of 60 degrees.

  The second tubular body 3 is integrally provided with a base 31 having a large diameter, and a fitting groove 33 is formed on the inner periphery on the outer end side thereof, and each of the ribs 35 having the inclined edge 34 on the inner side thereof, Similarly to the ribs 27, eight are provided at an angle of 60 degrees with respect to each other. Further, eight ribs 37 each having a vertical edge 36 at the inner inward position of the base portion 31 form an angle of 60 degrees with respect to each other in the same manner as the ribs 27 and 35. Is provided.

  The valve body 4 is made of elastic silicone rubber or the like, is entirely cap-shaped, has an annular convex edge 41 on its upper surface, and its peripheral portion 43 is thin and widened in a funnel shape.

  The flange portion 21 of the first tubular body 2 is inserted into the base portion 31 of the second tubular body 3, and the fitting convex edge 23 is fitted into the fitting concave groove 33, whereby the respective pipes 2, 3 are formed. Connected and fixed to each other. At that time, with the positioning mark or the like as a guide, each of the ribs 27 of the first tubular body 2 and the ribs 35 and 37 of the second tubular body 3 are positioned to face each other. The valve body 4 is provided so that the peripheral portion 43 covers the connection end portion of the first tubular body 2, the peripheral edge 45 end of the peripheral portion 43 is on the connection side surface 24 of the flange portion 21, and the convex edge 41 is the rib 37. The vertical edges 36 are arranged so as to abut each other. In this way, the valve body 4 is positioned and disposed in the space S surrounded by the rib 27, the rib 35, and the rib 37 inside the connection between the first tube body 2 and the second tube body 3.

  Hereinafter, the operation of the check valve 4 will be described. When fluid is sent in the direction of the arrow X from the first tubular body 2 side, the fluid reaches the part surrounded by the valve body 4 in the space S from the open end of the first tubular body 2 as indicated by the arrow Y, and As the fluid pressure increases, the peripheral edge 45 of the valve body 4 is displaced against the elasticity to open in the arrow Z direction. As a result, a gap is generated between the end of the peripheral edge 45 and the connection side surface 24 of the flange portion 21, and the fluid reaches the outside of the peripheral portion 43 of the valve body 4 by passing through the gap. 35, the outer peripheral space of the valve body 4 and between the ribs 37 to reach the inside of the second tubular body 3, and are sent out from the second tubular body 3 in the direction of arrow U.

  When the fluid pressure disappears, the peripheral edge 45 of the valve body 4 is returned and displaced by elasticity, and the gap is closed thereby preventing the fluid from flowing backward.

  FIG. 3 shows a second embodiment. In this embodiment, an end surface portion 52 is integrally provided at the connection side end portion of the first tubular body 2, and a pair of openings are provided at opposite positions outside the flange portion 21 in the vicinity thereof. 53 is formed. The opening 53 is provided in such a size that the fluid can pass therethrough without any problem. The valve body 4 is made of silicone rubber or the like as in the above embodiment, and a thin circular surface portion 63 is integrally provided at one opening surface position of the annular outer peripheral portion 62, and at the center of the surface portion 63. A circular hole 65 is provided. As for the valve body 4, the outer peripheral part 62 is clamped between the collar part 21 of the 1st pipe body 2, and the 2nd pipe body 3 side, and it is the outer side of the end surface part 52 of the 1st pipe body 2 in the circular hole 65. The hemispherical projection 55 projecting from is mounted in a fitted state.

  Hereinafter, the operation of the check valve 4 will be described. When fluid is sent in the direction of the arrow X from the first tube body 2 side, the fluid reaches the portion surrounded by the outer peripheral portion 62 of the valve body 4 through the two openings 53 of the first tube body 2 as indicated by the arrow Y. Further, when the fluid pressure is further increased, the peripheral edge 68 of the circular hole 65 of the surface portion 63 is displaced against the elasticity to open in the direction of the arrow Z, so that the space between the peripheral edge 68 and the outer surface of the end surface portion 52 is opened. A gap is formed in the second tubular body 3 through the gap, and the fluid reaches the second tubular body 3 as indicated by an arrow W, and is sent out from the second tubular body 3 in the direction of the arrow U. When the fluid pressure disappears, the peripheral edge portion 68 of the surface portion of the valve body 4 is returned and displaced by elasticity, thereby closing the gap and preventing the fluid from flowing backward.

Sectional drawing which follows the flow-path direction of 1st Embodiment of the non-return valve of this invention Arrangement explanatory drawing of valve of 1st embodiment of check valve of this invention Sectional drawing which follows the flow-path direction of 2nd Embodiment of the non-return valve of this invention

Explanation of symbols

1 Check valve 4 Valve body 45 Edge

Claims (1)

  A valve body having a thin peripheral edge portion having elasticity is arranged so as to block the flow path, and the thin peripheral edge section of the valve body is elastically displaced by fluid pressure from one side of the flow path, thereby A check valve characterized in that when the flow path is opened and the fluid pressure disappears, the thin peripheral edge portion is elastically returned and displaced to close the flow path.

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