JP2017166689A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a less-expensive check valve producing stable operation and high productivity.SOLUTION: A check valve A is used under a combination of a water service meter or a stop valve to be fixed to a water service pipe or a water feeding pipe of a building. An outside surrounding an upstream side end of a cage cylindrical part 11 has a flange part 12 and an outer periphery of a cylindrical part 21 of a valve flange 20 has an annular groove 22 to which the flange part 12 is fitted. An outer peripheral side wall surface 23 of the groove 22 and an outer peripheral surface 13 of the flange part 12 are contacted at their slant surfaces, and the cage and the valve flange are integrally assembled through thread couplings 14, 24. Since the outer peripheral side slant surface 23 of the groove and the outer peripheral slant surface 13 of the flange part are gradually expanded toward the downstream side at the time of thread coupling, they may produce a wedge effect for moving the cage inward and the valve flange outward so as to make a thread connection more rigidly. The cage is manufactured by cutting a metallic rod and the valve flange is manufactured by cutting a metallic pipe to cause their productivity to become high, have a less-expensive and a high mechanical strength to perform a stable operation.SELECTED DRAWING: Figure 2

Description

  This invention is used in combination with a water meter or a stop cock attached to a pipe (pipe) such as a water pipe or a water supply pipe of a building such as an apartment house or a detached house, and the water in the pipe flows backward. It relates to a check valve to prevent.

Conventionally, a check valve that prevents the water in the pipe from flowing back to the water meter or the stop cock has been used in combination with a water meter or a stop cock attached to the pipe such as the water pipe. (See Patent Document 1 FIG. 1 and FIG. 1 of this application).
The locations where the check valves are to be installed are all of the water supply pipes to each consumer as described above, and there are a vast number over a wide area. At that time, in the combination with the water meter, the check valve is a consumable that needs to be replaced every eight years because of the relationship with the metering law. For this reason, the check valve needs to be manufactured at a low cost, and the casing (casing) and the valve body are mostly injection-molded products made of highly productive chlorine-resistant resin.

By the way, recent construction circumstances have shifted to high-rise buildings and high-rise condominiums in highly convenient urban areas, and the water supply method has been switched from the conventional tank method to the direct water supply method. In this direct water supply system, water hammer pressure (water hammer) higher than expected acts on the check valve from the secondary side, and there is a problem that leads to destruction of the resin casing or malfunction of the valve body due to the water hammer pressure. doing.
Such troubles cause the water supply to go bad, and in some cases, parts flow into the building piping, and a large amount of money is required to remove the inflowing parts from the pipeline.

JP 2010-276037 A Japanese Patent Laying-Open No. 2015-152066

Under such circumstances, there is a movement of metallization of members that receive water hammer pressure such as a check valve housing and a valve seat, and a proposal has been made to cast the outer shell prototype with a mold to improve the efficiency of the cutting process. (See Patent Document 2).
However, cast products are lower than metal bars in the amount of cutting, but the yield is poor due to defects due to casting, and labor costs for mounting components on machine tools are required, and initial investment for casting molds is also required. It is not necessarily an economic method.

  This invention makes it a subject to set it as the metal non-return valve which can obtain the stability of operation | movement, and high productivity, without requiring a highly skilled technique under the above actual condition.

In order to achieve the above object, according to the present invention, first, the valve casing (housing) is made of metal, and the casing is divided into a storage cage for the valve body and a valve flange for connecting the cage to the conduit. is there.
If it is made of metal in this way, there is very little risk of destruction of the casing due to water hammer pressure and malfunction of the valve body. Further, since the cage and the valve flange are divided, the former cage can be manufactured by cutting from a solid metal bar, and the latter valve flange can be manufactured from a metal pipe. In this way, the rods and pipes can be made of ready-made products, and the material will be stable, and compared to the case where the cage and valve flange are manufactured integrally from solid rods, The material cost can be low.

Next, according to the present invention, the divided housing for the valve body and the valve flange are screwed together on the inner surface of the cage, and the screw coupling is firmly integrated (locked) by the wedge effect of the pair of inclined surfaces.
Although the storage cage and the valve flange of the valve body can be easily separated by the division, the screw connection with the wedge effect is strong and the integration of the cage and the valve flange is stably maintained over a long period of time.

  The structure of the present invention includes a bottomed metal cylindrical cage whose opening side is upstream, a metal valve flange provided on the entire outer periphery of the opening edge of the cage, and a valve hole in the cage. And a valve body movably loaded in the cylinder axis direction in the cage, and an elastic member that urges the valve body toward the upstream side, and the valve shaft of the valve body is A boss portion that forms the bottom of the cage is supported through a valve shaft support hole so as to be movable in the cylinder axis direction, and the valve body moves away from the valve seat by moving downstream by fluid pressure. In the check valve that opens the hole and moves upstream by the biasing force of the elastic member to close the valve hole in contact with the valve seat, a flange is formed on the outer periphery of the upstream end of the tubular portion of the cage. And the flange part is fitted on the outer periphery of the tubular part of the valve flange. An annular groove is provided, and the outer peripheral side wall surface of the groove and the outer peripheral surface of the flange portion are in contact with each other by an inclined surface, and both the inclined surfaces gradually increase in diameter toward the downstream side. The flange can adopt an integrated configuration by screwing a male thread on the outer surface of the cylindrical part provided on the downstream side of the valve flange into a female thread on the inner surface of the cylindrical part provided on the opening side of the cage.

  In this configuration, the external thread of the cylindrical part provided on the downstream side of the valve flange is screwed into the internal thread of the cylindrical part provided on the opening side of the cage, thereby integrating the cage and the valve flange by screw connection. Secured. In addition, since the outer peripheral inclined surface of the groove and the outer peripheral inclined surface of the flange gradually increase in diameter toward the downstream side at the time of this screw connection, the cage is located on the inner side (axial center side) on both inclined surfaces. A force for moving the valve flange to the outside is generated (a wedge effect is exhibited), and the screw connection is further strengthened. When this cage and valve flange are integrated, if a gap is created between the front surface of the cage and the bottom surface of the groove, the valve flange has a margin for screwing into the cage and the wedge effect is effective. Can demonstrate.

  The cage is composed of the opening-side cylindrical portion, the boss portion, and a strut portion extending between the cylindrical portion and the boss portion. The strut portion and the tubular portion are tubular. The portion may have a stepped portion having a large diameter. Usually, cutting is performed from one end of the workpiece to the other end by an end mill, a bite or the like, and burrs are likely to occur at the other end. However, if the step portion is provided, if the step portion is used as the other end of the cutting process, even if a burr is generated by one cutting, the burr is removed by the other cutting. Not.

Further, the cage is composed of the opening-side cylindrical portion, the boss portion, and a strut portion extending between the cylindrical portion and the boss portion, and an outer peripheral surface of the cage strut portion. Can be configured as a polygonal surface composed of a plurality of planes. Thus, if the support | pillar part is formed by plane cutting, processing will become easy.
At this time, the boss portion can be cylindrical, and if the outer peripheral surface of the boss portion is flush with the flat surface or in the axial direction, pressure loss flowing on the outer surface of the boss portion is suppressed. it can.

  The check valve cage of this configuration can be manufactured by cutting from a solid round bar, and the latter valve flange can be manufactured by cutting from a pipe. These manufactures are performed as continuous fully automatic processing by a machining center or the like. High productivity can be obtained.

  Since the present invention is configured as described above, it is possible to provide a check valve that can withstand unexpected water hammer pressure, and to use a metal rod (pipe) that is highly stable in terms of material. A structure that can be processed automatically makes it highly productive, stable, and economical.

Schematic diagram of the state of use of one embodiment of a check valve according to the present invention Expanded sectional view of the same embodiment Exploded perspective view of the same embodiment Main part exploded perspective view of the same embodiment The perspective view of the cage of other embodiment The perspective view of the cage of each other embodiment same as the above The perspective view of the cage of each other embodiment same as the above

  1 to 4 show an embodiment of a check valve A according to the present invention, and the check valve A of this embodiment is also downstream of a water meter M of a water supply pipe P as shown in FIG. A water stopcock V such as a ball valve is provided on the upstream side of the water meter M. These connections are made in the same manner as before by the nut N and the connecting pipe p.

  As shown in FIGS. 2 to 4, the check valve A has a valve seat 2 formed around the valve hole 1 in the casing, and is a valve that is movably loaded in the direction of the cylinder axis that contacts and separates from the valve seat 2. A body 3 and an elastic member 4 made of a coil spring that urges the valve body 3 toward the upstream side, and the valve shaft 5 of the valve body 3 is movable in the cylinder axis direction on the boss 6 at the bottom of the casing. It is supported via the valve shaft support hole 6a. The valve seat 2 is constituted by a ring-shaped packing 2a. The above configuration is the same as the conventional one.

  The feature of the present invention in the check valve A is that the casing is made of a metal cylindrical cage 10 such as a bottomed bronze whose opening side is upstream, bronze provided around the outer periphery of the opening edge of the cage 10, etc. It is the point comprised with the metal valve flange 20 of this. The cage 10 is manufactured from a solid round bar by cutting with a cutting tool such as an end mill or a bite, and the latter valve flange 20 is similarly manufactured by cutting from a pipe with an end mill or the like. In this way, the rods and pipes can be made of ready-made products, can be made of stable materials, and when the cage 10 and the valve flange 20 are manufactured integrally from solid rods. In comparison, material costs can be low. Furthermore, it can be automatically performed at night by a machining center or the like. The valve flange 20 may also be cut out from a rod (solid material).

The cage 10 has a flange portion 12 on the outer periphery of the upstream end of the cylindrical portion 11, and an annular groove 22 into which the flange portion 12 is fitted on the outer periphery of the cylindrical portion 21 of the valve flange 20. The outer peripheral side wall surface 23 of the groove 22 and the outer peripheral surface 13 of the flange portion 12 are in close contact with each other with almost the entire width in the inclination direction, and both the inclined surfaces 23 and 13 gradually increase in diameter toward the downstream side. Yes.
The cage 10 and the valve flange 20 are integrated by screwing a male screw 24 on the outer surface of the cylindrical portion 21 provided on the downstream side of the valve flange 20 into a female screw 14 on the inner surface of the cylindrical portion 11 provided on the opening side of the cage 10. . This integration means that the packing 2a is brought into pressure contact with the inner surface of the cage 10 at the leading edge of the cylindrical portion 21 of the valve flange 20 described below by the required pressure, so that the valve seat 2 becomes immobile (set in place). I) state. At this time, it is preferable that the bottom surface 22a of the groove 22 and the front surface 12a of the flange portion 12 of the cage 10 have a gap s (see FIG. 2).

The cage 10 includes the opening-side cylindrical portion 11, the boss portion 6, and a support column portion 15 that is provided at equal intervals around the cylindrical portion 11 and the boss portion 6. The part 15 and the cylindrical part 11 have a step part 16 in which the cylindrical part 11 has a large diameter. That is, the diameter L ₁ of the support column 15 is smaller than the diameter L ₂ of the cylindrical portion 11 (L ₁ <L ₂ ). By providing the step (step portion) 16, the step portion 16 is processed in the order from the cylindrical portion 11 to the column portion 15 as the other end (end) of the column portion 15 and the cylindrical portion 11 in the cutting direction. For example, even if burrs are generated at the other end of the cylindrical portion 11, the burrs are removed by cutting the support column 15, so that deburring work is not necessary.

  The cage 10 is formed from a solid round bar by cutting with a cutting tool such as a cutting tool to form the flange portion 12, the column portion 15 and the boss portion 6 into a cylinder, and then the flange portion 12, the column portion 15 and the boss portion. The inside of the portion 6 is cut to form the valve hole 1, the storage space for the valve body 3, the valve shaft support hole 6 a, and the like, and further, the gaps between the support columns 15 are formed.

The check valve A is configured as described above. In the disassembled state of FIG. 3, after the elastic member 4 and the valve body 3 (valve shaft 5) are loaded into the cage 10, the packing 2a is fitted into the cage 10 and the valve 10 The flange 20 is integrated with the cage 10 by screwing the screws 14 and 24 together. By this screwing, the packing 2a is pressed against the inner surface of the cage 10 at the front end edge of the cylindrical portion 21 of the valve flange 20, and the valve seat 2 becomes immobile.
Further, at the time of this screwing, the outer peripheral side wall surface 23 of the groove 22 and the outer peripheral surface 13 of the flange portion 12 are in contact with each other on the inclined surface, and both the inclined surfaces 23 and 13 are gradually expanded in diameter toward the downstream side. Therefore, with the fitting of the inclined surfaces 23 and 13 in the cylinder axis direction, a force is generated to move the cage 10 inward (axial side) and the valve flange 20 outward, thereby further strengthening the screw connection. . At this time, since the bottom surface 22a of the groove 22 and the front surface 12a of the flange portion 12 of the cage 10 have a gap s, the valve flange 20 has an allowance for screwing into the cage 10 due to the gap s. Secure effectively.
Note that the inclination angles of the inclined surfaces 13 and 23 may be appropriately determined by experiments or the like in consideration of the friction coefficient of the two as long as the above-described strong screw connection is ensured. Can be adopted, and can be set to about 30 degrees.

  The check valve A is attached to the downstream side of the meter M with a nut N by fitting the packing 7 to the valve flange 20 as in the conventional case. Incidentally, when a water pipe is connected to the meter M, it is connected in a watertight manner with a packing, but since this packing 7 has a check valve A, it is said to be a meter packing 7 with a check valve.

In the attached check valve A, when water is used on the downstream side of the meter M, the valve body 3 resists the elastic member 4 by the flowing water pressure (in the direction of the arrow in FIG. 1) as shown by a chain line in FIG. Then, the valve hole 1 is opened away from the valve seat 2 by moving to the downstream side. That is, the valve is opened, and the tap water flows from the outer peripheral surface of the boss portion 6 to the downstream side through the valve hole 1 and further through the opening (gap) between the support portions 15.
On the other hand, when there is no use of water on the downstream side, as shown by the solid line in FIG. 2, the valve body 3 moves upstream by the urging force of the elastic member 4 to contact the valve seat 2 and close the valve hole 1. That is, the valve is closed.
When the water use is stopped, the water hammer is blocked by the check valve A even if a water hammer pressure higher than expected is applied from the downstream side (secondary side), and the water hammer pressure does not reach the meter M. Absent. At this time, the water hammer pressure acts on the check valve A, but since the casing (the cage 10 and the valve flange 20) is made of metal, there is very little possibility that the water hammer pressure will sufficiently withstand the damage.

  If a concave portion a having a conical shape or a pyramid shape is formed by a punch at an appropriate position around the boundary line between the flange portion 12 of the cage 10 and the groove 22 of the valve flange 20, both of the concave portion a form the boundary line. Since the members 12 and 20 are meshed with each other, the cage 10 and the valve flange 20 are more firmly integrated.

  In the said embodiment, as shown in FIG. 5, the outer peripheral surface of the support | pillar part 15 of the cage 10 can be formed in the polygonal surface which consists of several plane 15a by cutting processes, such as an end mill and a milling machine. The cage 10 of this embodiment forms the flange part 12, the support | pillar part 15, and the boss | hub part 6 in a cylinder by cutting with a cutting tool, such as a cutting tool, from a solid round bar, for example, Then, the flange part 12, the support | pillar part 15 and the inside of the boss 6 are cut to form the valve hole 1, the storage space for the valve body 3 and the valve shaft support hole 6a, and the outer peripheral surfaces of the cylindrical support column 15 and the boss 6 are end mills or the like. Are cut into the three surrounding flat surfaces 15a to form gaps between the column portions 15. In the cage 10 of this embodiment, since the void ratio (opening ratio) between the support portions 15 can be significantly increased compared to the cylindrical cage 10 (FIG. 4) of the above embodiment, the passage of fluid Resistance can be reduced.

Moreover, as shown in FIG. 6, the boss | hub part 6 can be made into a column (cylindrical) shape by a bite cutting etc. As shown in FIG. The boss 6 has a diameter protruding from the flat surface 15a (FIG. (A)), a diameter that is flush with the flat surface 15a (inscribed outer peripheral surface) (FIG. (B)), or the flat surface 15a. The shape may be a diameter (small diameter) submerged from (Fig. 3 (c)).
In this embodiment, when the valve is opened, tap water flows through the valve hole 1 and further through the openings between the support columns 15 from the outer peripheral surface of the boss 6 to the downstream side. In the difference, the pressure loss decreases in the order of FIG. 6 (a) → (b) → (c).

  The cage 10 of this embodiment forms the flange part 12, the support | pillar part 15, and the boss | hub part 6 in the cylinder of required diameter by cutting with a cutting tool, such as a cutting tool, from a solid round bar, for example, Then, a flange part 12, the inside of the support column 15 and the boss 6 is cut to form the storage space (valve hole 1 and the like) of the valve body 3 and the valve shaft support hole 6a, and the outer peripheral surface of the cylindrical support column 15 is an end mill or the like. Are cut into the three surrounding planes 15a to form gaps (openings) between the support columns 15.

In each of the above-described embodiments, as shown in FIG. 7, the connection end edge 15 b (the same figure (a), (c)) with the boss part 6 of the column part 15 and the edge 6 b (the same figure ( In (a) to (c)), arc-shaped or angular chamfering can be performed. The chamfering may be performed on either one of both end edges 15b and 6b. Further, the number of planes (processed surfaces) 15a can be any of the three sides, four sides, five sides, six sides, seven sides, eight sides, etc., but a normal spanner is a hexagonal hole. It is preferable to use six sides that are double the three sides shown in the drawing so that the hexagon socket wrench can be used.
Moreover, in each embodiment, it can also be set as the structure which does not have the step part 16 by making the outer peripheral surface of the cylindrical part 11 and the support | pillar part 15 of the said cage 10 into the same surface.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The configuration in which the outer periphery of the support column 15 shown in FIGS. 5 to 7 is a polygonal surface composed of a plurality of flat surfaces 15a is not limited to the cage 10 according to the present invention, It can also be employed in forged products and resin molded products. That is, the bottomed cylindrical cage 10 whose upstream side is upstream, the valve flange 20 provided on the entire outer periphery of the opening edge of the cage 10, and the valve seat 2 formed around the valve hole 1 in the cage 10 The valve body 3 is mounted in the cage 10 so as to be movable in the cylinder axis direction, and the elastic member 4 biases the valve body 3 toward the upstream side. The valve shaft 5 of the valve body 3 is a cage. 10 is supported by the boss portion 6 forming the bottom of the cylinder 10 through the valve shaft support hole 6a so as to be movable in the cylinder axis direction, and the valve body 3 moves away from the valve seat 2 by moving downstream by the fluid pressure. A check valve that closes the valve hole 1 in contact with the valve seat 2 by opening 1 and moving upstream by the biasing force of the elastic member 4 can be employed. At this time, it goes without saying that the cage 10 and the valve flange 20 may be different from the above embodiment or may be integrated.

A Check valve P Water pipe p Connection pipe M Water meter N Nut V Stop cock s Gap 1 Valve hole 2 Valve seat 2a Packing 3 forming valve seat Valve body 4 Elastic member (coil spring)
5 Valve shaft 6 Boss portion 6a Valve shaft support hole 6b Chamfering 7 of boss portion Packing 10 Cage 11 Cylinder tubular portion 12 Cage flange portion 13 Flange inclined surface 15 Strut portion 15a Cage flat surface 15b Chamfering of strut portion 20 Valve flange 21 Tubular portion 22 of valve flange Groove 23 Outer peripheral side wall surface of groove

Claims (7)

A bottomed cylindrical metal cage (10) whose upstream side is upstream, a metal valve flange (20) provided on the entire outer periphery of the opening edge of the cage (10), and a valve in the cage (10) A valve seat (2) formed around the hole (1), a valve body (3) loaded in the cage (10) so as to be movable in the cylinder axis direction, and the valve body (3) on the upstream side And the valve shaft (5) of the valve body (3) has a valve shaft support hole (6a) in the boss portion (6) forming the bottom of the cage (10). ), The valve body (3) is moved away from the valve seat (2) by moving to the downstream side by fluid pressure, and the valve hole (1) is opened. Then, the valve hole (1) is closed in contact with the valve seat (2) by moving upstream by the urging force of the elastic member (4). In the valve (A),
A flange portion (12) is provided on the outer periphery around the upstream end of the tubular portion (11) of the cage (10), and the flange portion (12) is provided on the outer periphery of the tubular portion (21) of the valve flange (20). ), And the outer peripheral side wall surface (23) of the groove (22) and the outer peripheral surface (13) of the flange portion (12) are in contact with each other on the inclined surfaces, and both the inclined surfaces thereof. (23, 13) gradually increases in diameter toward the downstream side,
The cage (10) and the valve flange (20) are formed in a tubular shape provided on the downstream side of the valve flange (20) on the internal thread (14) on the inner surface of the tubular portion (11) provided on the opening side of the cage (10). When the male screw (24) on the outer surface of the part (21) is screwed in, the cage (10) is brought inward and the valve flange (20) is brought out in accordance with the fitting of the inclined surfaces (23, 13) in the cylinder axis direction. The check valve is characterized in that a force for moving each is generated and integrated.   When the cage (10) and the valve flange (20) are integrated, the front surface (12a) of the cage (10) and the bottom surface (22a) of the groove (22) have a gap (s). The check valve according to claim 1.   The cage (10) includes the opening-side cylindrical portion (11), the boss portion (6), and a support strut extending between the cylindrical portion (11) and the boss portion (6). The support portion (15) and the tubular portion (11) have a step portion (16) having a large diameter of the tubular portion (11). Or the check valve according to 2.   The cage (10) includes the opening-side cylindrical portion (11), the boss portion (6), and a support strut extending between the cylindrical portion (11) and the boss portion (6). The outer peripheral surface of the support column (15) of the cage (10) is a polygonal surface consisting of a plurality of planes (15a). The check valve according to one.   The check valve according to claim 4, wherein the boss portion (6) has a cylindrical shape.   6. The check valve according to claim 5, wherein an outer peripheral surface of the boss portion (6) is flush with the flat surface (15a) or in an axial direction.   The method for manufacturing a cage (10) and a valve flange (20) of the check valve (A) according to any one of claims 1 to 6, wherein the former cage (10) is made of a solid round bar. A check valve cage and a valve flange manufacturing method, characterized in that the latter valve flange (20) is manufactured by cutting from a pipe.

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