JP2010276037A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage of a cage by impact to the cage caused by the movement of a valve body, by being arranged in a meter side end part of a pipe body. <P>SOLUTION: The valve body 13 contacting with and separating from a valve seat 12 formed around a valve hole 11, is supported by the cage 14 in which a valve stem 19 extends to the downstream side from a head part 18 for blocking up the valve hole 11 and the valve stem 19 is fixed to the downstream side of the valve hole 11. The cage 14 is made of a synthetic resin, and is formed by arranging an annular ring-shaped boss part 27 inside a downstream end part of three column parts 26 extending to the downstream side from an annular part 25 fitted to the outside of the valve seat 12. A metallic reinforcing member 32 is provided to the cage 14. The reinforcing member 32 is composed of a ring part 34 fixed to the boss part 27 of the cage 14, an arm part 33 running along an outer surface of the respective column parts 26 of the cage 14 by extending in a radial shape from an outer edge part of the ring part 34 and an engaging piece 35 outward in the radial direction arranged on the upstream side end of the respective arm parts 33. The reinforcing member 32 is inserted and integrally molded in injection molding of the cage 14, and the reinforcing member 32 is surely fixed to the boss part 27 of the cage 14. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is used in combination with a meter or a stop cock attached to a pipe body such as a water pipe or a water supply pipe of a building, an apartment house, a detached house, etc., and the water in the pipe body is transferred to a meter or a stop cock. The present invention relates to a check valve that prevents backflow.

  Conventionally, check valves have been used to prevent backflow of water in pipes in combination with meters and stopcocks attached to pipes such as water pipes and water pipes of buildings such as buildings, apartment houses, and detached houses. (See Patent Document 1).

  For example, as shown in FIG. 7A, the check valve 40 is provided in a pipe body P connected to the downstream side of the meter 50. A water stop cock (not shown) is normally connected to the upstream side of the meter 50 and is used for water stop when the meter 50 is replaced.

  As shown in FIG. 7B, an annular valve seat 41 having a flange is fitted into the opening end of the tube P on the meter 50 side. A valve body 42 is detachably provided on the valve seat including the valve seat 41, and the valve body 42 is contacted and separated by a cylindrical cage 43 fitted to the valve seat periphery of the valve seat 41. It is held movably in the direction.

  The valve body 42 in the cage 43 has a head portion 44 that contacts and separates from the valve seat of the valve seat 41 and a valve shaft 45 that extends downstream from the head portion 44. The cage 43 has a plurality of longitudinal slits on its side surface, and water passes through the slits.

  A coil spring 47 that passes the valve shaft 45 through a cylindrical guide portion 46 formed so as to rise from the bottom surface of the cage 43 toward the valve seat, and urges the valve body 42 in the valve closing direction outside the guide portion 46. It is attached. The valve element 42 is held in the cage 43 so as to be movable in the contact / separation direction, and is biased in the valve closing direction by the biasing force of the coil spring 47.

  As shown in FIG. 8A, the cage 43 includes a locking claw 48 provided on the inner peripheral portion of the upstream end portion thereof, and a locking claw 49 provided on the outer peripheral portion of the valve seat of the valve seat 41. Are connected to the valve seat 41 by engaging with each other.

  With this connection structure, the check valve 40 can be easily assembled by engaging the cage 43 into which the valve element 42 is inserted with the valve seat 41. Further, when the check nut 40 is turned with respect to the water stop cock with the check valve 40 fitted in the pipe body P, the check valve 40 is fixed to the opening end of the pipe body P. Good workability.

  When the check valve 40 is opened, the valve element 42 moves in the downstream direction against the urging force of the coil spring 47 due to the water flow, and is opened, so that water passes through the slit of the cage 43. And flows in the tubular body P (see the dashed line in FIG. 7B).

  On the other hand, when the water stop cock is closed, the valve body 42 is pressed against the valve seat of the valve seat 41 by the urging force of the coil spring 47 to close the valve, thereby preventing the reverse flow of water in the pipe P.

Japanese Patent Laid-Open No. 9-72442

  The check valve 40 has a valve seat 41 as shown in FIG. 8 (b) due to the deterioration of the cage 43 due to aging and the impact on the cage 43 due to the movement of the valve body 42 accompanying the opening and closing operation of the stop cock. There is a risk that the cage 43 will be disengaged from the valve seat 41 due to disengagement of the cage 43 by the locking claws 48 and 49.

  In order to prevent the cage 43 from falling off, it is conceivable that the engagement between the valve seat sheet 41 and the cage 43 by the locking claws 48 and 49 is strengthened. The cage 43 may be damaged by the impact on the cage 43 and the function of the check valve 40 may be impaired.

  Therefore, an object of the present invention is to prevent the cage from being damaged by the impact on the cage 43 accompanying the movement of the valve body 42 without affecting the pressure loss of the fluid.

  In order to solve the above-described problems, the present invention includes a valve seat formed around a valve hole, a valve body that can contact and separate from the valve seat, and an elastic member that biases the valve body toward the upstream side. The valve body moves away from the valve seat by moving downstream by fluid pressure, opens the valve hole, and contacts the valve seat by moving upstream by the biasing force of the elastic member. In the check valve that closes the valve hole, the valve body includes a head that closes the valve hole, and a valve shaft that extends downstream from the head, and the valve shaft is the valve hole. The cage is supported by a cage fixed on the downstream side of the valve seat, the cage extending from the outside of the valve seat toward the downstream side, and the valve shaft at the downstream end of the column portion in the contact / separation direction And a metal reinforcing member for the cage. The reinforcement member can be configured to have an arm portion along the outer side of the outer portion of the cage and a ring portion provided at the downstream end of the arm portion and fixed to the boss portion. .

  If it does in this way, as for the cage which supports the valve stem of a valve element, a pillar part will be reinforced by an arm part of a reinforcement member, and a boss part will be reinforced by a ring part of a reinforcement member, respectively. For this reason, for example, it becomes possible to receive an impact on the cage due to the movement of the valve body accompanying the opening / closing operation of a water stop cock or the like with the metal reinforcing member, and it is possible to prevent the cage from being damaged.

  Further, since the reinforcing member includes the arm portion along the outer portion of the cage, the flow of the fluid flowing between the adjacent column portions of the cage is not hindered, and the pressure loss of the fluid is not affected.

  The cage is made of synthetic resin and is integrally molded with the reinforcing member, so that it can be injection-molded and a cage provided with the reinforcing member can be easily manufactured. Moreover, the conventional metal mold | die which shape | molds a cage can be used as it is, and it is economical.

  Further, in order to securely engage the cage and the reinforcing member with the end face of the tubular body to which the check valve is attached, a radially outward engagement is provided at the upstream end of the column portion of the cage and the arm portion of the reinforcing member. It is possible to adopt a configuration in which a joint portion is formed and the engaging portion of the pillar portion is sandwiched between the engaging portion of the arm portion and the radial flange formed on the valve seat. .

  According to the present invention, the cage that holds the valve body is provided with the reinforcing member, so that the cage can be prevented from being damaged due to the impact on the cage caused by the movement of the valve body. In addition, since the reinforcing member is provided so that its arm part is along the outer part of the cage, the flow of fluid flowing between adjacent pillar parts of the cage is not obstructed, and the pressure loss of the fluid is affected. Does not affect.

Sectional drawing which shows the non-return valve of Example 1. (A) Cross-sectional view showing the closed state of the check valve, (b) Cross-sectional view showing the open state of the check valve. (A) Partially cutaway sectional view showing the upstream side of the check valve, (b) Enlarged sectional view showing engagement between the valve seat of the check valve and the cage, (c) FIG. ) Sectional view taken along line XX A perspective view of the check valve as seen from the upstream side A perspective view of the check valve as seen from the downstream side The perspective view which shows the reinforcement member of a non-return valve same as the above Cross-sectional front view of a conventional check valve Sectional front view showing the connecting part between the valve body and the cage

  A first embodiment of a check valve according to the present invention is shown in FIGS. As shown in FIG. 1, the check valve 10 in the first embodiment is connected to a pipe body P such as a water supply pipe or a pipe on the downstream side of the meter 1, and the opening end of the pipe body P on the meter 1 side. Installed inside.

  The check valve 10 includes an annular valve seat 12 formed around a valve hole 11, a valve body 13 that can contact and separate from the valve seat 12, and a valve body 13 that can move in the contact and separation direction. A cage 14 to be held and a coil spring 15 as an elastic member for urging the valve body 13 toward the upstream side are provided.

  As shown in FIG. 2 (a), the valve seat 12 is formed with a radially outward flange 16 at the upstream end, and has an elasticity that allows the valve element 13 to contact and separate from the downstream end. A ring 17 is provided. Moreover, the engagement recessed part 12a is formed in the outer peripheral part by the side of the flange 16 of the valve seat 12 (refer Fig.3 (a) to (c)).

  The valve body 13 held by the cage 14 includes a head 18 that contacts and separates from the seal ring 17 of the valve seat 12 and a valve shaft 19 that extends from the head 18 toward the downstream side. The head portion 18 is formed with an abutting portion 21 that comes into contact with and separates from the seal ring 17 on the outer periphery of the bulging portion 20 toward the upstream side. In addition, it is preferable that the head 18 of the valve body 13 has a height that does not protrude from the rubber packing (gasket 30).

  The bulging portion 20 has a spherical surface facing the upstream side, and a valve shaft 19 is integrally formed on the surface facing the downstream side of the bulging portion 20, and the valve shaft 19 is a pair of two extending toward the downstream side. It is formed from a shaft-like body.

  The valve body 13 is held by a cage 14 fixed on the downstream side of the valve seat 12. The cage 14 is made of synthetic resin, and as shown in FIGS. 4 and 5, an annular portion 25 fitted to the outside of the valve seat 12, and three pillar portions extending from the annular portion 25 toward the downstream side. 26 and an annular boss portion 27 provided inside the downstream end portion of each column portion 26. Since the cage 14 is made of synthetic resin, it can be formed by injection molding.

  In the annular portion 25 of the cage 14, as shown in FIGS. 3A to 3C, engagement ribs 25a are formed at three positions in the circumferential direction on the upstream side of the inner peripheral portion. . Each engagement rib 25 a can be engaged with the engagement recess 12 a of the valve seat 12, and the position of the circumferential center coincides with the circumferential center of the column part 26. For this reason, the engagement rib 25 a can be engaged with the engagement recess 12 a of the valve seat 12, and the valve seat 12 can be easily fitted to the inner peripheral portion of the cage 14. In addition, the engagement rib 25a can change an installation location and the circumferential direction length suitably according to the specification of the engagement recessed part 12a of the valve seat 12 based on the standard of the non-return valve 10. FIG.

  According to this engagement structure, when the check valve 10 is closed and the downstream side is in a reverse pressure state, the valve seat 12 against which the valve body 13 is pressed by the fluid is received by the engagement rib 25a of the cage 14. Can do. For this reason, stress concentration at the boundary portion between the valve seat 12 and the flange 16 is less likely to occur, and deformation and breakage of the boundary portion can be prevented.

  Even when the valve body 13 held by the cage 14 is attached to the valve seat 12 and the valve body 13 is pressed against the valve seat 12 by the elasticity of the coil spring 15, the valve seat 12 is engaged with the engagement rib of the cage 14. Can be received at 25a. As a result, the gasket 30 to be described later can prevent the appearance of the gasket 30 from deteriorating without generating a gap between the flange 16 of the valve seat 12 and the engaging portion 29 of the cage 14.

  A step portion 25b is formed inward in the radial direction on the downstream side (column portion 26 side) of the inner peripheral portion of the annular portion 25 of the cage 14, and between the step portion 25b and the downstream end portion of the valve seat 12 is formed. The seal ring 17 is held. Furthermore, a radially outward flange-like engagement portion 29 is formed at the upstream end of the annular portion 25 over the entire circumference.

  Each column part 26 is equally distributed in the circumferential direction of the downstream end of the annular part 25, and the boss part 27 is fixed inside the downstream end part so that the annular part 25 and the boss part 27 are separated from each other. (See FIG. 5). With this structure, fluid can be passed between the adjacent column portions 26 between the annular portion 25 and the boss portion 27.

  The boss portion 27 is formed with a cylindrical guide body 28 that protrudes upstream from the peripheral edge of the central hole. The guide body 28 guides the valve shaft 19 of the valve body 13 so as to be movable toward and away from the seal ring 17 of the valve seat 12.

  The coil spring 15 is mounted on the outside of the guide body 28 of the boss portion 27 and is held between the boss portion 27 and the head 18 of the valve body 13. The valve body 13 is urged by the coil spring 15 so as to move upstream, and the contact portion 21 of the head portion 18 contacts the seal ring 17 of the valve seat 12 to close the valve hole 11 (FIG. 2). (See (a)). Further, due to the pressure of the fluid (fluid pressure), the valve element 13 moves to the downstream side against the biasing force of the coil spring 15 and leaves the valve seat 12 to open the valve hole 11 (FIG. 2B). reference).

  As shown in FIG. 6, the reinforcing member 32 provided in the cage 14 is obtained by bending a metal plate having a predetermined shape, and includes a ring portion 34 fixed to a boss portion 27 of the cage 14, and a ring portion 34. An arm portion 33 extending radially from the outer edge portion and extending along the outer surface of each column portion 26 of the cage 14, and a radially outward engagement piece 35 (engagement portion) provided at the upstream end of each arm portion 33. (See FIG. 5).

  The ring portion 34 of the reinforcing member 32 is fixed to the boss portion 27 of the cage 14 so that the valve shaft 19 of the valve body 13 can be inserted. Since the cage 14 is made of synthetic resin, it can be injection-molded. At the time of molding, the reinforcing member 32 can be inserted into the cage 14 and integrally molded.

  By integrally molding, the reinforcing member 32 is securely fixed to the boss portion 27 of the cage 14 and the reinforcing effect is improved. In order to increase the fixing strength of the ring portion 34 with respect to the boss portion 27, a hole 34a may be provided in the ring portion 34, and the resin injected from the cage 14 may enter the hole.

  Each arm portion 33 of the reinforcing member 32 has two holes 33a spaced in the length direction, and a radially outward engagement piece 35 is formed at the upstream end. Each engagement piece 35 has a required length in the circumferential direction. Further, holes 35 a are provided on both sides of the engagement piece 35 and are arranged along the engagement portion 29 of the cage 14. Therefore, the gasket 30 is formed by being covered with the annular rubber packing in a state where the engaging portion 29 is sandwiched between the engaging piece 35 of the reinforcing member 32 and the flange 16 of the valve seat 12 (see FIG. 5). ).

  Further, when the reinforcing member 32 is inserted into the cage 14 and injection molded, as shown in FIG. 5, the resin injected into the cage 14 enters the holes 33a and 35a. As a result, the arm portion 33 and the engaging piece 35 of the reinforcing member 32 are securely fixed to the column portion 26 and the engaging portion 29 of the cage 14, and the reinforcing effect is improved.

  Further, since the gasket 30 is sandwiched between the downstream end portion of the meter 1 and the end portion of the pipe body P, the reinforcing member 32 is securely fixed to the cage 14 together with the flange 16 of the valve seat 12, and the reinforcing effect is obtained. improves.

  As shown in FIG. 1, the check valve 10 configured as described above includes a cap nut 2 in a state where the gasket 30 is sandwiched between the downstream opening end of the meter 1 and one end side end of the tube P. It is fixed by tightening. Further, when the cap nut 2 is tightened, the rubber packing of the gasket 30 is elastically deformed to seal between the meter 1 and the pipe P.

  When a stop cock (not shown) connected to the upstream side of the meter 1 is opened, fluid such as water presses the head 18 of the valve body 13 to the downstream side by the fluid pressure, and the valve body 13 is moved to the valve seat. 12, the valve hole 11 is opened. Thereby, the fluid flows in the pipe body P. On the other hand, when the stop cock is closed, the upstream side of the check valve 10 has a lower water pressure than the downstream side, and the urging force of the coil spring 15 moves the head 18 of the valve body 13 to the upstream side. The hole 11 is closed.

  The valve body 13 that moves as the valve hole 11 opens and closes is held by the cage 14, and the cage 14 is further reinforced by the reinforcing member 32, so the impact on the cage 14 that accompanies the movement of the valve body 13. Even if it receives, damage to the pillar part 26 of the cage 14 is prevented.

  Further, since the engaging portion 29 of the cage 14 and the engaging piece 35 of the reinforcing member 32 are covered with the rubber packing together with the flange 16 of the valve seat 12 to form the gasket 30, the cage 14 is prevented from falling off. be able to.

  Furthermore, since the reinforcing member 32 includes the arm portion 33 along the outside of the outer portion of the cage 14, the flow of the fluid flowing between the adjacent column portions 26 of the cage 14 is not obstructed, and the pressure of the fluid Does not affect the loss.

DESCRIPTION OF SYMBOLS 1 Meter 2 Cap nut 10 Check valve 11 Valve hole 12 Valve seat 12a Engagement recessed part 13 Valve body 14 Cage 15 Coil spring 16 Flange 17 Seal ring 18 Head 19 Valve shaft 20 Bulging part 21 Contact part 25 Annular part 25a Engagement rib 25b Step part 26 Column part 27 Boss part 28 Guide body 29 Engagement part 30 Gasket (rubber packing)
32 Reinforcing member 33 Arm portion 33a Hole 34 Ring portion 34a Hole 35 Engagement piece 35a Hole 40 Check valve 41 Valve seat 42 Valve body 43 Cage 44 Head 45 Valve shaft 46 Guide portion 47 Coil spring 48 Locking claw 49 Engagement Claw 50 Meter P Tube

Claims (3)

A valve seat formed around the valve hole, a valve body that can contact and separate from the valve seat, and an elastic member that urges the valve body toward the upstream side. In the check valve which opens the valve hole away from the valve seat by moving to the side, closes the valve hole in contact with the valve seat by moving to the upstream side by the biasing force of the elastic member,
The valve body includes a head portion that closes the valve hole, and a valve shaft that extends downstream from the head portion, and the valve shaft is supported by a cage fixed to the downstream side of the valve hole. The cage includes a column portion extending from the outside of the valve seat toward the downstream side, and a boss portion that supports the valve shaft at the downstream end of the column portion so as to be movable in the contact / separation direction. A metal reinforcing member for the cage, the reinforcing member being provided on the arm portion along the outside of the outer portion of the cage, and a ring portion provided at the downstream end of the arm portion and fixed to the boss portion And a check valve.   The check valve according to claim 1, wherein the cage is made of a synthetic resin and is integrally formed with the reinforcing member.   A radially outward engaging portion is formed at the upstream end of the cage column and the arm portion of the reinforcing member, and the engaging portion of the column includes the engaging portion of the arm portion and the valve seat. The check valve according to claim 1 or 2, wherein the check valve is provided in a state of being sandwiched between radial flanges formed on the inner surface of the check valve.

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