JP6386772B2 - Packing integrated check valve - Google Patents

Description

  According to the present invention, in a packing-integrated check valve having a metal outer shell body, an inner peripheral wall of a sliding support hole through which a valve shaft made of a synthetic resin that supports a valve body is inserted so as to advance and retreat is formed on the synthetic resin surface. The present invention relates to a packing integrated check valve.

  Conventionally, the check valve is set at the inner diameter portion of the connection joint on the secondary side of the water meter and has prevented the reverse flow from the secondary side from flowing back from the water meter to the primary side. For the purpose of adding a prevention function, for example, as proposed in Patent Document 1, a packing integrated check that can be installed in the same manner as a meter packing by forming a gasket in which a gasket is fitted in a flange shape on the seat side A valve is used.

On the other hand, with respect to the flange body formed on the seat portion of the packing integrated check valve, in order to prevent interference with the flange of the flanged pipe joint and excessive deformation of the flange packing, the pipe joint is attached to the packing as in Patent Document 2. Although a contrivance is made to provide a relief part that prevents interference with the flange and a restricting part that prevents over-deformation of the packing in the recess of the valve seat part, if the outer shell body of the check valve is damaged, the position fixing structure against water flow The problem is that the check valve is caused to flow downstream and clog the piping, and the outer shell body is required to be robust.

On the other hand, the proposal by patent document 3 which inserts a metal reinforcement member at the time of synthetic resin injection molding to the synthetic resin cage which accommodates the valve body is made, and there is no specific literature. However, it is made of synthetic resin on the outer shell body that is cut out of three pillars that connect the annular case body that houses the valve seat by cutting a metal bar and the boss that supports the sliding end of the valve shaft. There is an assembly of the valve body.

As main patent documents, the above-mentioned patent documents 1 to 3 exist.
Japanese Utility Model Publication No. 6-12879 JP 2009-115147 A JP 2010-276037 A

  The packing-integrated check valve has a cage and an outer shell that protect the valve body operating part by a plurality of struts that connect an annular case body that houses the valve seat and a boss part that supports the sliding end of the valve shaft. However, its outer shell body is formed by synthetic resin molding, and it is easily damaged by impacts on the cage accompanying movement of the valve body and interference with the flange of the flanged fitting. In addition, many problems such as clogging due to flow of the check valve into the pipe occur.

As described above, there is a metal outer shell body formed by cutting a metal bar, but the cutting process requires highly skilled techniques and requires a lot of time and labor. Therefore, the current situation is not so popular. In addition, a method in which a metal reinforcing member is inserted at the time of injection molding of a synthetic resin complicates the work process, such as the timing of inserting the reinforcing member, and also has a problem that can be applied only to the column portion.

Further, in the conventional check valve using a metal processing cage, the secondary inner diameter end of the valve seat housing portion is a horizontal plane perpendicular to the shaft center due to processing problems. There is a risk that the water flow flowing to the side will collide with the corner of the inner diameter and hinder smooth flow and consume the flow pressure energy.

  Therefore, the applicant of the present application proposes a packing integrated check valve in which the outer shell body constituting the valve seat housing portion, the sliding support portion of the valve shaft, and the column connecting the valve seat housing portion is formed by cutting a cast metal. However, the synthetic resin valve shaft is worn by the advance / retreat operation of the check valve because the sliding support hole through which the valve shaft made of the synthetic resin supporting the valve body is inserted is made of metal. In addition to becoming thinner, it hinders operation, and there is a problem that greatly affects the durability of the check valve.

  The present invention is intended to address the above-described problems, and a valve seat housing part, a sliding support part of the valve shaft, and an outer shell body constituting a column connecting the same are formed of metal to support the valve body. The inner peripheral wall of the sliding support hole through which the valve shaft made of synthetic resin is inserted so as to advance and retract is formed on the synthetic resin surface.

That is, a metal sliding support that guides the valve shaft is formed in an annular boss that opens at the center of the cage fixed to the secondary side of the outer shell body, and a synthetic resin is formed on the inner peripheral wall thereof. The sleeve made of synthetic resin is inserted and bonded, or the end of the synthetic resin sleeve is inserted and bonded to the opening of the annular boss of the cage center fixed to the secondary side of the outer shell body. .

Further, the metal outer shell body was set on the synthetic resin sleeve mold, and the metal boss and the synthetic resin sleeve were molded and bonded together by integral molding.

  Since the present invention is configured as described above, the valve body can be advanced and retracted by a sliding support body that is the same quality as the lightweight and flexible synthetic resin valve shaft while maintaining the robustness of the metal outer shell body. Since the support guide is provided, the valve body can be smoothly advanced and retracted, and the wear load of the valve shaft due to sliding can be greatly reduced, thereby improving the durability of the check valve.

If the metal shell body is set in the synthetic resin sleeve mold and the metal boss and the synthetic resin sleeve are molded and bonded together, structural injection is performed by sleeve molding. A stable outer shell body can be processed and molded all at once, and a troublesome process by manual work can be eliminated.

The longitudinal cross-sectional view which shows the Example of this invention and shows the whole structure of the conventional packing integrated check valve in a valve closing state Similarly, a longitudinal sectional view showing the entire structure of a conventional packing-integrated check valve in a valve open state Similarly, an embodiment of the packing integrated check valve according to the present invention is shown, and a packing integrated check valve having a synthetic resin surface on the inner peripheral wall of a sliding support hole through which a valve shaft made of synthetic resin is inserted is shown. Longitudinal section showing the entire structure Similarly, showing one embodiment of the packing integrated check valve according to the present invention, a longitudinal sectional view showing the structure of the metal outer shell body before the synthetic resin sleeve is fitted together Similarly, showing one embodiment, a longitudinal sectional view showing a state in which a synthetic resin sleeve is fitted to the metal outer shell body of FIG. Similarly, it shows one embodiment of a packing integrated check valve according to another embodiment, and is a longitudinal sectional view showing a structure of a metal outer shell body before fitting with a synthetic resin sleeve Similarly, a longitudinal sectional view showing a state in which a synthetic resin sleeve is joined to the metal outer shell body of FIG. Similarly, one embodiment of the packing integrated check valve according to the present invention is shown. A metal outer shell body is set in a synthetic resin sleeve mold, and a metal boss and a synthetic resin sleeve are integrated. Longitudinal sectional view showing the structure of the metal outer shell body before joining the sleeve made of synthetic resin in the embodiment of forming and joining by molding Similarly, a longitudinal sectional view showing a state in which a synthetic resin sleeve is molded and bonded to the metal outer shell body of FIG. Similarly, one embodiment of the packing integrated check valve according to the present invention is shown. A metal outer shell body is set in a synthetic resin sleeve mold, and a metal boss and a synthetic resin sleeve are integrated. Longitudinal sectional view showing the structure of the metal outer shell body before joining with the synthetic resin sleeve in another embodiment molded and joined by molding Similarly, a longitudinal sectional view showing a state in which a synthetic resin sleeve is molded and bonded to the metal outer shell body of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Reference numeral 1 denotes an outer shell body constituting an outer shell of a check valve cartridge, and a valve seat 12 is fitted on the primary side. A valve mechanism housing cage 4 for supporting and housing the valve body 2 that opens and closes contact with the seat 12 by a spring 3 to the primary side, a flange housing 13 that is screwed to the end portion, and a flange portion 13a of the flange housing 13 And a flange body 11 constituted by a gasket 13b made of an elastic material such as rubber.

At the top of the secondary side of the valve mechanism housing cage 4, a metal sliding support 42 that guides the valve shaft 21 through the annular boss 41 at the center is formed. A valve shaft insertion hole 43 passes through the center.

Reference numeral 5 denotes a sleeve made of synthetic resin. For example, as shown in FIG. 5, the outer diameter of the valve shaft insertion hole 43 corresponding to the inner periphery and the outer diameter of the valve shaft 21 correspond to the outer diameter. It has a cylindrical shape with an inner diameter to be inserted, and a flange 51 is formed at the end as required.

The sleeve 5 formed in this way has a female screw on the inner periphery of the valve shaft insertion hole 43 and a threaded engagement by engraving a male screw on the outer periphery of the sleeve 5, and the outer periphery of the sleeve 5 with respect to the inner diameter of the valve shaft insertion hole 43. It is fitted to the inner periphery of the valve shaft insertion hole 43 by press-fitting by making the diameter slightly thicker or by adhesion with an adhesive applied to any inner periphery or outer periphery.

In the second embodiment, for example, as shown in FIGS. 6 and 7, the through hole 44 opened in the annular boss 41 is formed without forming the sliding support 42 on the secondary side top of the valve mechanism housing cage 4. A synthetic resin sleeve 6 that forms a valve shaft insertion body with an inner diameter through which the valve shaft 21 is inserted has a female screw on the inner periphery of the through hole 44 and a male screw on the outer periphery of the fitting portion 61 formed at the end of the sleeve 6. By screwing, press-fitting by forming the outer diameter of the sleeve 6 end fitting portion 61 slightly thicker than the inner diameter of the through hole 44, or an adhesive applied to any inner or outer circumference The synthetic resin sleeve 6 is fitted into the through-hole 44 by bonding according to the above.

In the third embodiment, the metal valve mechanism housing cage 4 is set in the molding die of the synthetic resin sleeve 7, and the metal boss portion and the synthetic resin sleeve are molded and bonded together by integral molding. For example, as shown in FIG. 8, a metal sliding support 42 that guides the valve shaft 21 through the annular boss 41 is formed, and the valve shaft is inserted into the center of the sliding support 42. An annular recessed groove for forming a flange 71 at the secondary side end for supporting the sleeve 7 formed by injection molding in the sliding support 42 at the secondary side end of the sliding support 42 through which the hole 43 passes. The metal valve mechanism housing cage 45 formed with 42 a is set in the molding die of the synthetic resin sleeve 7.

A core pin (not shown) for molding the sleeve 7 body is set on the inner peripheral portion of the sliding support 42 of the set metal valve mechanism housing cage 45, and the figure is shown by injection molding of a resin material. As shown in FIG. 9, the flange 71 and the sleeve 7 body are molded at once, and a synthetic resin surface is formed on the inner peripheral portion of the sliding support 42.

In the fourth embodiment, a metal valve mechanism housing cage 46 is set in a molding die of the synthetic resin sleeve 7, and the metal boss portion and the synthetic resin sleeve are molded and bonded together by integral molding. FIG. 10 shows an embodiment, and as shown in FIG. 10, injection is made in the through hole 44 opened in the annular boss 41 without forming the sliding support 42 on the secondary side top of the valve mechanism housing cage 46. Molding of the synthetic resin sleeve 8 is made of the metal valve mechanism housing cage 46 formed with the annular recessed groove 44a for molding the flange 81 supporting the sleeve 8 forming the valve shaft insertion body formed by molding in the through hole 44. Set to type.

A core pin (not shown) for molding the sleeve 8 main body is set at the secondary side end portion of the through hole 44 of the set metal valve mechanism housing cage 46. By injection molding of the resin material, FIG. 11, the flange 81 and the sleeve 8 main body are molded at once, and the synthetic resin sleeve 8 is formed at the secondary side end of the through hole 44.

  The packing-integrated check valve according to the present invention is made of a synthetic resin outer shell body that is easily damaged, made of metal, strengthens the structure of the check valve body, and supports the valve body. The sliding support hole through which the shaft is inserted is made of metal, which solves the problem that the valve shaft made of synthetic resin wears due to the advance / retreat operation of the check valve and becomes thin and interferes with the operation. Therefore, the present invention provides a product that can be processed and formed very efficiently by means of forming processing that takes advantage of these characteristics, and thus has a high utility value in the water supply facility industry.

DESCRIPTION OF SYMBOLS 1 Check valve outer shell main body 11 Flange body 12 Flange body 12 Check valve valve seat 13 Flange housing 13a fitted to the valve mechanism accommodation cage opening side edge part Flange housing flange part
13b Gasket 2 fitted to the flange portion Valve body 21 of the check valve Valve shaft 3 of the check valve Energizing spring 4 Valve mechanism housing cage 41 Annular boss portion 42 on the secondary side top of the valve mechanism housing cage Valve shaft Metal sliding support 42a that guides through the guide 42a Annular concave groove 43 formed at the end of the secondary side of the metal sliding support 43 Valve shaft insertion hole 44 that passes through the center of the sliding support Annular boss portion through-hole 44a on the secondary top of the mechanism housing cage 44a Annular recessed groove 45 formed on the annular boss portion through-hole Metal valve mechanism housing cage 46 set in a synthetic resin sleeve mold 46 Synthetic resin Metal valve mechanism housing cage 5 according to another embodiment set in a sleeve mold 5 Synthetic resin sleeve 51 forming a valve shaft insertion hole Synthetic resin sleeve flange 6 Synthetic resin sleeve forming a valve shaft insertion body 61 Synthetic tree Joint portion 7 of the sleeve end 7 Synthetic resin sleeve 71 that forms the valve shaft insertion hole Synthetic resin sleeve secondary side flange 8 Synthetic resin sleeve 81 that forms the valve shaft insertion body Synthetic resin sleeve end Parting together

Claims (4)

In a water-packing integrated check valve , a valve seat housing portion and a valve shaft sliding support portion and an outer shell body constituting a column connecting the same are formed of metal, and the valve shaft sliding support portion A packing-integrated check valve characterized in that an inner peripheral wall of a sliding support hole through which a valve shaft made of a synthetic resin supporting a valve body is inserted so as to be able to advance and retract is formed on a synthetic resin surface. A metal sliding support that guides the valve shaft through the annular boss that opens at the center of the cage fixed to the secondary side of the outer shell body is formed, and a synthetic resin sleeve is formed on the inner peripheral wall thereof 2. A packing-integrated check valve according to claim 1, which is configured to insert and fit together. 2. The packing integrated check valve according to claim 1, wherein an end of the synthetic resin sleeve is inserted and fitted into an opening of a ring-shaped boss portion in the center of the cage fixed to the secondary side of the outer shell body. The packing integrated check valve according to claim 1, wherein a metal outer shell body is set in a synthetic resin sleeve mold, and the metal boss portion and the synthetic resin sleeve are molded and bonded together by integral molding.

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