JP6139935B2 - Packing-integrated check valve and return water prevention method using the same - Google Patents

Description

  The present invention relates to a packing integrated check valve used for a joint part of a joint pipe connected by a cap nut, such as a joint of a union socket which becomes a joint pipe on the secondary side of a water meter, and return water prevention using the same. It is about the method.

  Conventionally, for the seal of the joint portion connected by such a cap nut, since it is necessary to set a check valve that prevents backflow from the secondary side at the same time, 2. Description of the Related Art A packing integrated check valve in which a ring-shaped packing having a recessed fitting groove formed on a peripheral surface is fitted has been used.

Such a packing-integrated check valve is, for example, fitted in a pipe joint portion as described in Patent Document 1, and the packing fitted on the outer peripheral edge portion of the flange portion is connected to the upstream side (primary side). ) Of the joint pipe (for example, the secondary side end of the water meter) and the downstream side (secondary side) of the water stop end surface, the water stop is achieved by press contact engagement. .

  However, the packing-integrated check valve as described above is fitted in a joint portion having a flat water-stop end face opposite to the flange portion, and compresses the packing fitted to the outer peripheral edge portion of the flange portion. Because of the structure to stop the water, use a flanged joint pipe with a flange that has a front protruding edge that prevents the packing from shifting, or a multi-tube nested structure that creates a step on the water stop end face. When using the multi-pipe pipe joint, there is a problem that when the cap nut is tightened, the hook interferes with the flange portion and is damaged.

  For such a problem, the applicant forms a relief portion that prevents interference with the flange in the packing as described in Patent Document 2, and restricts over-deformation of the packing in the flange portion or the recess of the packing. It is proposed to provide.

Japanese Utility Model Publication No. 6-012879 JP 2009-115147 A

However, each of the above-described conventional packing-integrated check valves has a flange portion of the check valve in which a ring-shaped packing is fitted to the outer peripheral edge between the water stop end surface of each joint pipe to be joined and the flange. Since the non-return valve body is only fitted in the water stop end surface of the union socket that is sandwiched and becomes the secondary joint pipe, for example, the end of the water meter that becomes the primary joint pipe is removed. Then, the check valve body cannot support the internal pressure from the secondary side and falls off from the water stop end surface of the union socket, which is the secondary side joint pipe, and the return water from the secondary side becomes the joint part. There is a problem of leaking around.

Since the removed water meter main body and related parts are placed around the joint, the primary water pipe and other parts are removed, and at the same time, the return water that has flowed out is immersed in water. If the primary side is a water meter, muddy water overflows in the meter box, causing problems in later operations.

To avoid this, do not remove the primary joint pipe, such as a heavy water meter, while holding the check valve body so that it does not fall off when removing the primary joint pipe. Don't be. In addition, since the union socket used as the joint pipe on the secondary side is mass-produced as a commercial product, a locking mechanism cannot be formed on the inner diameter of the water stop end surface that fits the check valve body. There is also a situation that tolerance is large.

Also, if the check valve body is fixedly fitted to the water stop end surface of the joint pipe, it cannot be easily replaced when replacing the meter, and the function as a packing that requires replacement maintenance as a consumable part is impaired. Will be.

  SUMMARY OF THE INVENTION The present invention is intended to address the above-mentioned problems, and is to form a press-fitting expansion / contraction structure portion into a union socket water stop end surface lumen in a support trunk base portion of a seat seat surface outer shell of a packing integrated check valve. Therefore, when the check valve main body is fitted in the water stop end surface of the union socket that becomes the joint pipe on the secondary side, the support trunk base is press-fitted. Even if the primary side flange portion clamping member is removed, the check valve body is configured so that the non-return valve body is kept in the water stop end surface of the union socket by the pressure force of the support base. did.

  In addition, the press-fitting expansion / contraction structure portion formed on the support stem base has an outer diameter structure that press-fits to the inner diameter of the union socket on the outer diameter portion of the support stem base portion of the seat seating surface outer shell of the packing integrated check valve. By forming the members by joining them, it is possible to simplify the forming work, or to selectively apply the joining members that can cope with the joint purpose and the structure of the inner diameter of the union socket.

Furthermore, the outer diameter structure that press-fits to the inner diameter of the union socket is composed of a male thread-like spiral ridge, and the press-fitting to the inner diameter of the union socket is related to the advancing and retracting force due to torsional rotation, so It is constructed so that it can be attached and detached without difficulty by adding propulsiveness to the pressing force at the time and the pulling force at the time of separation.

  In addition, the outer diameter structure of the joining member has a two-stage structure in which the tip side of the formed press-fitting expansion / contraction structure portion is slightly smaller in diameter and a narrow expansion / contraction structure portion is formed by parallel projecting circumferential strips. This corresponds to the fact that there is an allowable error in the inner diameter, and the engagement force is increased by press-fitting and reducing the diameter. The material of the joining member is a resin such as polyacetal, or a copper alloy such as stainless steel or brass depending on the setting environment or purpose.

  In the present invention, even if the primary side flange portion clamping member is removed as described above, the check valve main body is maintained in a state of fitting into the water stop end surface of the union socket by the pressure of the support trunk base portion. Since it was configured as such, it can be removed without worrying about the return water from the secondary side when replacing or maintaining the water meter located on the primary side, and when moving to the next work, Since the return water can be treated by removing the check valve, the wasteful labor and cost required for the removal work of the primary side equipment such as a water meter can be greatly reduced.

In addition, a press-fitting expansion / contraction structure part such as an outer diameter structure with a male thread-like spiral ridge is formed on the support trunk base part so that the check valve can be easily collected and unloaded to the inner diameter of the union socket. In addition to fully exhibiting the water-tight packing action as a body shape, it was possible to easily replace it and to improve the efficiency of maintenance work on the joint.

1 shows an embodiment of the present invention, and is a shaft longitudinal sectional side view showing the entire structure of a joint fitting joint portion by a packing integrated check valve according to the present invention and a cap nut fitted therein. Similarly, the primary device is a water meter, and the joint main part showing the overall structure in which the packing integrated check valve according to the present invention is fitted in the union socket on the secondary side and the joint with the cap nut is performed is a cutaway section. Overall side view Similarly, an overall side view of the meter box with a cutaway cross section showing the primary and secondary piping conditions and overall structure in the meter box after the water meter is removed from the primary device. Similarly, an exploded shaft vertical side view of the check valve main body and the mating member of the embodiment in which the press-fitting expansion / contraction structure portion is formed by the mating member Similarly, the shaft longitudinal side view of the packing integrated check valve after the fitting member in the embodiment of FIG. 4 is joined. Similarly, in the embodiment of the mating member according to the present invention, a side view of the outer diameter portion of the mating member in which the press-fitting expansion / contraction structure portion is formed on a male thread-like spiral ridge. Similarly, in another embodiment of the fitting member according to the present invention, a slit portion is set in the annular main body so as to be fitted to the check valve main body, and the press-fitting expansion / contraction structure portion corresponds to the inner diameter error of the union socket. The joining member made into the step outside diameter is shown, (a) is a bottom view of a joining member, (b) is AA sectional drawing of (a), (c) is a check valve for the joining member. Whole shaft longitudinal side view showing the situation of fitting into the main body and fitting into the inner diameter of the union socket Similarly, in another embodiment of the mating member according to the present invention, a check valve is formed by engraving a male screw on the support base of the check seat body outer shell and engraving a female screw on the inner diameter of the mating member. 1 shows a joining member screwed with a male screw of a support trunk base of a main body, (a) is a bottom view of the joining member, (b) is a cross-sectional view taken along line AA of (a), and (c). Is a side view of the entire longitudinal axis of the shaft, showing the situation where the fitting member is fitted to the check valve body and fitted into the inner diameter of the union socket. Shaft longitudinal side view showing the entire structure of a joint fitting joint with a packing integrated check valve according to the conventional example and a cap nut fitted therein

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, in which the primary joint pipe is a water meter, the secondary joint pipe is a union socket, and 1 is a check valve of the packing integrated check valve. In the main body, the ring-shaped packing 2 having a concave fitting groove 21 formed on the inner peripheral surface is fitted to the outer peripheral edge of the flange portion 11, and the secondary water stop end surface 4 a of the water meter 4 to be joined and the union socket 5. It is sandwiched and supported between the eaves 5a serving as the primary water stop end surface, and seals the joint portion.

  Reference numeral 3 denotes a cap nut, a latching portion 31 that latches on the stepped portion 51 of the union socket 5, and a female screw 32 that engages with a male screw 41 engraved on the outer diameter of the water-stop end surface 4 a of the primary water meter 4. In the state where the latching portion 31 is latched on the stepped portion 51 of the union socket 5, the female screw 32 is screwed with the male screw 41 of the water meter water-stopping end surface 4a, thereby the primary water-stopping end surface. And the water stop end surface of the secondary side stop are moved close to each other or moved away from each other.

  The packing-integrated check valve is fitted on the water stop end surface 5a side of the secondary union socket 5, and the downstream end surface of the packing 2 fitted on the outer peripheral edge of the check valve body flange portion is connected to the union socket 5. The water stop end surface 5 a is pressed against the water stop end surface 4 a of the water meter 4, and the gasket 2 is disposed through the flange portion 11 covered.

  The check valve body 1 includes a cartridge outer shell body 12, a sliding valve 13, and a coil spring 14 that urges the sliding valve 13 to the primary side. A valve seat portion 15 is provided.

The water flow from the primary side passes through the water meter 4 and flows into the check valve on the secondary side, pushes open the sliding valve 13 biased to the primary side by the coil spring 14, and enters the secondary side piping. Although flowing, the return water pressure from the secondary side is closed by the sliding valve 13 being pressed against the valve seat portion 15 and closed.

However, when the water meter 4 is removed for maintenance or replacement, the water pressure is released from the primary side, and the internal pressure on the secondary side is loaded on the packing integrated check valve all at once.

As shown in FIG. 9, the conventional packing-integrated check valve has a flange portion 11 with the packing 2 fitted on the outer peripheral edge thereof, which is one of the secondary water stop end surface 4 a of the water meter 4 and the union socket 5. Since the check valve main body 1 that has lost its support is dropped from the union socket 5 as shown in FIG. Will do.

As shown in FIG. 1, the packing-integrated check valve according to the present invention forms a press-fitting expansion / contraction structure portion 7 into the union socket water-stop end surface lumen in the support trunk base portion 6 of the seat seat outer shell. When the check valve body 1 is fitted in the water stop end surface, the press-fitting expansion / contraction structure portion 7 of the support stem base 6 is pressure-engaged to the inner diameter of the union socket, so that the water pressure on the primary side is released and the secondary side is released. The check valve main body 1 is prevented from falling off due to the pressure engagement force of the press-fitting expansion / contraction structure 7 even when the internal pressure is applied to the packing integrated check valve.

The first embodiment is an embodiment in which a press-fitting expansion / contraction structure portion 7 is formed by fitting a fitting member 61 having an outer diameter structure that is press-fitted to an inner diameter of a union socket. A male thread-like spiral ridge 71 is formed on the outer diameter portion of the annular base body 62, and a flange 64 is formed on the upper end portion to be joined to the flange portion 11 of the check valve body.

As shown in FIGS. 4 and 5, the annular base 61 of the joining member is inserted into the support trunk base 6 and welded as it is to be integrated with the check valve body 1, as shown in FIG. As shown in FIG. 8 (b), an internal thread is formed on the inner wall of the annular base body so that the support base base part 6 You may make it screw with the engraved male screw. Needless to say, the male thread-like spiral ridge 7 may be directly engraved on the support base 6.

The male thread-like spiral ridge has a pressing force at the time of press-fitting into the inner diameter of the union socket by relating the pressure engagement to the smooth inner diameter of the union socket together with the press-fitting expansion / contraction due to the elasticity of the material and the forward / backward force due to torsional rotation. By adding propulsiveness to the pulling force at the time of detachment, it can be attached and detached without difficulty.

In the second embodiment, the outer diameter structure of the joining member in which the slit 63 is inserted into the annular base body 62 has a slightly smaller diameter at the distal end side of the formed press-fitting expansion / contraction structure section, and the small expansion / contraction structure section 72 by the parallel projecting circumferential stripes. In response to the tolerance of the inner diameter of a commercially available union socket, when the inner diameter of the union socket is large due to the tolerance, the expansion / contraction formed in the back of the narrow expansion / contraction structure 72 When the inner diameter of the union socket is small due to tolerance, when the inner diameter of the union socket is small due to tolerance, when the narrow expansion / contraction structure 72 at the tip is press-fitted into the inner diameter of the union socket, So as to be surely engaged by being inserted into the recessed groove 65 of the outer shell of the seat seat surface so as to increase the press-fit diameter reducing force and the engaging force.

  That is, first, the narrow expansion / contraction structure part 72 is reduced in diameter at the boundary part 73 with the press-fitting expansion / contraction structure part 7 and inserted into the inner diameter of the union socket. Since the narrow expansion / contraction structure 72 repels in the restoring direction, the engagement effect on the inner diameter of the union socket is enhanced. In this case, the form of the press-fitting expansion / contraction structure part 7 formed on the back part of the expansion / contraction structure part at the tip may be any form such as an array of a large number of protrusions and a male thread-like spiral protrusion.

  In the third embodiment, a male thread is engraved on the support base 6 of the outer shell of the seat seat surface, and a female thread 66 is engraved on the inner diameter of the annular base of the fitting member so that it can be attached and detached by screwing. The joining members having different forms can be selectively used.

  The packing integrated check valve according to the present invention and the return water prevention method using the same greatly contribute to water meter installation and maintenance, etc. when branching water from a main pipe of a water pipe to a branch pipe, such as a condominium. Therefore, it has high utility value in the water supply industry.

DESCRIPTION OF SYMBOLS 1 Check valve body 11 Flange part 12 of check valve body 12 Cartridge outer shell 13 Sliding valve 14 Coil spring 15 Valve seat part 2 Cover packing 21 of check valve body flange part Inner peripheral surface recessed groove of cover packing 3 Cap nut 31 Locking portion 32 Cap nut female screw 4 Water meter 4a Water meter secondary water stop surface 41 Water meter secondary water stop surface male screw 5 Union socket 5a Union socket water stop surface 51 Stepped portion of union socket 6 Support base of seat seat outer shell 61 Joining member 62 Ring base of joining member 63 Joining member split 64 Joining member flange 65 Seat seat outer shell recessed groove 66 Internal thread 7 of inner ring of inner member 7 Press-fit expansion / contraction structure 71 Spiral ridge 72 Narrow expansion / contraction structure 73 Boundary with press-fit / expansion structure

Claims (6)

Between the joint pipe connected by the cap nut, the valve seat part that forms a seat seat surface is fitted in the water stop end surface of a union socket or the like that becomes the secondary joint pipe, and is in contact with the seat seat surface. It has a sliding valve part that presses and engages in a separable manner, and a flange part that is sandwiched between the water stop end face of each of the joint pipes to be connected and the flange, and a concave fitting groove is formed on the inner peripheral surface. In the packing integrated check valve in which the recessed groove of the ring-shaped packing is fitted to the outer peripheral edge of the flange portion, a male thread-like spiral ridge made of an elastic member such as a synthetic resin is formed on the support base of the seat seat outer shell . A packing integrated check valve used in a joint portion of a joint pipe formed and connected to a water meter end portion, characterized in that it is a press-fitting expansion / contraction structure portion into a union socket water stop end surface lumen . The press-fitting expansion / contraction structure formed on the support stem base is a fitting member having an outer diameter structure that press-fits to the inner diameter of the union socket on the support stem base outer diameter portion of the seat seating surface outer shell of the packing integrated check valve. The packing integrated check valve according to claim 1 , wherein the packing is integrated and formed. The seat member of the packing-integrated check valve is configured such that the joining member is formed of an annular base body having a press-fitting expansion / contraction structure portion formed on the outer diameter portion, and a flange that is joined to the flange portion of the check valve body is formed at one end portion. Chakugo member which is fitted joined to the support stem base of Mengaikara is, the support stem base of the seating surface shell, according to claim 1 or claim 2 wherein, characterized in that it is welded at the joint Packing integrated check valve. The fitting member is configured as an annular base body having a press-fitting expansion / contraction structure part formed on the outer diameter part, and a slit is set in the annular base body, and the fitting member is fitted to the support base of the seat seat outer shell of the packing integrated check valve. The packing integrated check valve according to claim 1 or 2, wherein the check valve is attached. The joining member is configured as an annular base body having a press-fitting expansion / contraction structure part on the outer diameter part, a female screw is engraved on the inner diameter wall of the annular base part, and a support trunk for the seat seating surface outer shell of the packing integrated check valve The packing-integrated check valve according to claim 1 or 2, wherein the check valve is threadedly engaged with a male screw engraved on the base. The press-deflating structure, slightly claim 1 or claim 2 or claim 4, wherein by carrying out the small diameter to form a modest expansion and contraction structure by parallel circular projection strip or spiral ridges as a two-stage structure of the distal end Packing integrated check valve.

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