JP4519534B2 - Resin ball check valve for sewage and manhole pump unit using the same - Google Patents

Description

The present invention is related to manhole pump unit using a resin ball check valve for sewage this.

  This type of ball check valve is a valve that operates so that a valve body, which is a ball, prevents back flow of fluid by back pressure of the fluid, and is used in various piping facilities.

For example, this ball check valve is arranged in the middle of a discharge pipe of a submersible pump submerged in a manhole containing sewage so as to prevent backflow of sewage pumped when the submersible pump is stopped. Usually, this check valve is provided so as to move along the ball guide formed in the body to the retreat path, and this ball is seated on the primary seat, and the opening portion of the retreat path is covered with the lid. (See, for example, Patent Document 1).
JP-A-11-132181

  In this case, if the check valve is used with a vertical pipe, the ball may ride on the opening portion of the retreat path, so that the ball does not roll to the seat portion side and does not sit on the seat portion. It was.

In particular, when the body is molded from a resin, the opening portion has a tapered shape that increases in diameter from the inside of the body toward the opening in consideration of removal of the mold during molding.
For this reason, if a resin ball check valve is used by piping vertically, the ball may ride on the tapered opening, and the ball may not be seated on the seat. It had problems such as loss.

The present invention solves the conventional problems, and the object of the present invention is to ensure that the ball does not run up near the opening of the retraction path even if the ball check valve is plumbed vertically. An object of the present invention is to provide a resin ball check valve for sewage that can be guided to a seating portion.

In order to achieve the above object, the invention according to claim 1 is configured such that a ball valve body is accommodated in a body made of resin and having connecting portions at both ends. The retraction path is movably provided on the retraction path while being seated on the primary side seating section and reversely locked, and guided by a ball guide section formed toward the secondary side in the body by the positive pressure of sewage. The opening provided above the body is detachably covered with a resin lid, and the ball guide is projected integrally with the lid toward the seating portion side toward the center of the inner circumferential surface of the lid in the flow direction. This ball guide is a resin ball check valve for sewage provided on the inner peripheral surface of the lid so as to draw a gentle arc in parallel with a plurality of plate thicknesses .

The invention according to claim 2 is a resin ball check valve for sewage in which the ball guide is extended from the inner periphery of the lid so as to be along the seating portion side of the opening.

In the invention according to claim 3, the primary side of the ball check valve is joined to the vertical discharge pipe of the submersible pump disposed in the manhole, and the delivery pipe is joined to the secondary side of the ball check valve to reverse the ball. This is a manhole pump unit using a resin ball check valve for sewage in which a stop valve is arranged in a vertical pipe.

According to the present invention , in the ball check valve attached to the vertical pipe, even if the ball valve body moves to a position near the opening of the retreat path, it does not ride up to the vicinity of the opening and is guided by the ball guide, It is possible to solve the problems caused by the resin body.

In addition , the ball valve element that can be molded with the resin integrally with the lid and is located in the vicinity of the opening is smoothly guided by an arc-shaped ball guide having a plurality of plate thicknesses and a gentle inner peripheral surface.

Further , since the ball guide is extended along the seating portion side of the opening, the movement is surely promoted without riding over the opening, and the function as a check valve is effectively exhibited.

In addition , when a resin ball check valve is provided on the vertical discharge pipe of the horizontal pump arranged in the manhole, the ball positioned near the opening of the retreat path is guided smoothly by the ball guide, Therefore, the practical value of the manhole unit using a resin ball check valve is great.

An embodiment of a resin ball check valve for sewage and a manhole pump unit using the same according to the present invention will be described in detail with reference to the drawings.
In FIGS. 1 and 2, reference numeral 1 denotes a body made of resin and integrally formed. The connecting portions 2 and 3 provided at both ends of the body 1 are provided with screw portions 4 and 5. A retract path 6 for retracting the valve body 10 is provided, and an opening 6 a of the retract path 6 is covered with a resin lid 8 via an O-ring 7 and a bolt 9.

A ball guide 34 is provided inside the lid 8 so as to extend along the opening 6a when the retreat path 6 is covered.
The reason why the ball guide 34 is provided is that, when the body 1 is molded from resin, the opening 6a is expanded from the inside of the body 1 toward the opening in consideration of removal of the mold during molding. since that is the tapered shape, as shown in FIG. 9 a ball check valve, when used in pipe vertically, it causes the ball valve element 10 rides on the tapered opening 6a, a possibility that has not seated on the seat portion 16 is there. Therefore, in the ball check valve according to the present invention, as shown in FIG. 7 and the like, the inside of the lid 8 is arranged along the opening 6a, and the other is directed from the inner center of the lid 8 toward the seating portion 16. A ball guide 34 formed so as to draw a gentle arc is provided. The ball guide 34 has a plate shape having a predetermined thickness and is formed to be long along substantially the entire opening 6a. Even when the ball check valve is vertically plumbed, the ball valve body 10 is formed in the opening 6a. The ball valve element 10 can be reliably guided to the seating part 16 without riding up. In addition, by providing a plurality of the plate-like ball guides 34 in parallel, the ball valve body 10 can be further stably guided to the seating portion 16.

Further, a ball valve body 10 in which a core metal 10a is covered with rubber is housed in the body 1, and this ball valve body 10 is seated on a seating portion 16 by a back pressure of a fluid and is reversely reversed. It is provided to move to the retreat path 6 along the ball guide portion 11 formed in the body 1 by the positive pressure of the fluid.
Further, the body 1 is provided with a plurality (three in this example) of U-shaped insertion grooves 12 formed by cutting out toward the opening side of the primary side (connecting portion 2) of the body 1.

In FIGS. 5 and 6, reference numeral 13 denotes a resin-made insertion cylinder, and one air vent hole 14 is formed on the outer peripheral surface of the insertion cylinder 13 so that the inside and the outside communicate with each other. As shown in the figure, the air vent hole 14 is integrally formed with a projecting portion 15 having a female thread portion 15 a, and the projecting portion 15 of the insertion tube 13 is formed in an appropriate insertion groove 12 of the body 1. While being inserted, the insertion tube 13 is fitted into the body 1 and inserted through an O-ring 17 mounted between the engagement step portion 1 a provided in the body 1 and the insertion groove 13 a of the insertion tube 13. The cylinder 13 and the body 1 are sealed. Further, a seating portion 16 for seating the ball valve body 10 is formed inside the distal end of the insertion tube 13. In addition, you may form other piping joint shapes, such as an external thread, in the protrusion part 15 instead of an internal thread.
Note that the air vent hole 14 unnecessarily causes fluid to flow out when the pump is operated and hinders the pumping. Therefore, the air vent hole 14 satisfies the condition for ensuring the minimum pumping capacity required for the pump and is clogged. Therefore, the opening diameter is set to satisfy a condition that does not cause clogging due to foreign matters mixed in with the fluid. Specifically, in the case of a valve having a nominal diameter of 50, the diameter of the air vent hole is preferably set within a range of 15 to 25 mm, and is set to about 20 mm in this embodiment.

  As described above, in this embodiment, the body 1 is assembled with the insertion tube 13 as an insertion portion having an air vent function separate from the body 1 so as to be detachable, and the check valve is assembled and completed. Therefore, it is not necessary to newly attach the inflow pipe portion to the check valve as in the prior art.

  Moreover, as shown in FIGS. 1-6, the union nut 18 is detachably screwed to the male thread portion 4 of the connecting portion 2 of the body 1, and the flange portions 20 of the resin-made end connectors 19a, 19b, 19c are attached. A union joint structure is used in which the end connectors 19a, 19b, 19c are connected to the connecting portion (primary side) 2 of the body 1 by being sandwiched.

  As shown in FIG. 6, this end connector can be appropriately connected to various resin pipes so as to correspond to the socket joint 19a, the screw joint 19b, and the flange joint 19c.

  In the figure, reference numeral 21 denotes an O-ring mounted in a mounting groove 13 b formed at the rear end of the insertion tube 13, which seals the insertion tube 13 and the flange portion 20 through the O-ring 21. Reference numeral 22 denotes a union nut that is screwed into the external thread portion 5 provided on the connection portion (secondary side) 3 of the body 1, and the body 1 and the end connectors 24 a, 24 b, The flange portion 25c of 24c is provided so as to be detachably joined while being sealed.

For the check valve in this example, for example, polyamide, hard vinyl chloride resin, polypropylene, polycarbonate, polytetrafluoroethylene, polyethylene, and other resin materials are appropriately selected and used. Good.
In the figure, 26 is a cap that covers the projection 15 when the air vent hole is not used, 27 is a submersible pump that is submerged in the manhole 28, and 29 is provided in the submersible pump 27. A discharge pipe 30 is a resin delivery pipe connected to the secondary side of the check valve.

Next, the operation of the above embodiment will be described.
For example, as shown in FIG. 9, when the ball check valve in this example is mounted between the discharge pipe 29 and the delivery pipe 30 of the submersible pump 27 disposed in the manhole 28 containing sewage or the like, the resin discharge pipe The discharge pipe 29 and the delivery pipe 30 are joined to each other by an end connector (for example, screw type end connectors 19b, 24b) corresponding to the delivery pipe 29 and the resin delivery pipe 30.

In this case, considering the workability including the check valve mounting workability, mounting performance, mounting space, etc. in the manhole 28, the loading of the body 1 is performed so that the protruding portion 15 provided in the air vent hole 14 is disposed. The position of the groove 12 is selected. In this example, one is selected from the three insertion grooves 12 on the left and right sides and the lower side of the body 1. For example, when the air vent hole 14 is positioned on the side of the body 1 in FIGS. The insertion tube 13 can be incorporated into the body 1 by inserting the protruding portion 15 of the insertion tube 13 into the insertion groove 12 provided on the side of 1 and tightening the union nut 18, and the arrangement of the protrusion 15 is also completed. To do.
Further, a discharge pipe 31 is connected to the protruding portion 15 so that air accumulated on the primary side of the check valve is discharged to the outside through the air vent hole 14.

Next, when the submersible pump 27 is driven, fluid such as sewage flows to push up the ball valve body 10 of the check valve , and the ball valve body 10 moves to the retreat path 6 while being guided by the ball guide portion 11. The flow path is opened, and the fluid is sent to the delivery pipe (secondary side) 30 side of the check valve.

Next, when the submersible pump 27 is stopped, the ball valve body 10 is seated on the seating portion 16 of the check valve due to its own weight and the back pressure of the fluid, and is closed in the check state, so that fluid such as sewage flows backward. Is blocked.

In this case, air accumulated on the primary side is discharged to the outside by the air vent hole 14 provided on the outer periphery of the primary side of the body 1, so that the ball valve body 10 is securely seated on the seating portion 16 and kept closed. To do.

On the other hand, when the submersible pump 27 is re-driven while the ball valve body 10 is seated, the air is surely discharged to the outside through the air vent hole 14 on the primary side. Thus, a situation in which the fluid is not pushed up is avoided, so that the fluid such as sewage discharged by the submersible pump 27 is reliably pumped, and the ball valve body 10 is pushed up to smoothly feed the fluid.

Also, the ball valve element 10 can be charged from the opening 6a formed in the evacuation passage 6 of the body 1, from the discharge pipe 29 and delivery tube 30 without removing the ball check valve, the ball valve element 10 Easy to install and replace.
According to the ball check valve in this example, the ball moves to the opening side of the retreat path, but when trying to prevent the back flow of the fluid, the ball valve body is smoothly guided to move by the ball guide, and the seat portion There is no worry of getting on the opening side of the retreat path.
In this example, since the seating portion 16 is formed inside the distal end of the insertion tube 13, the seating portion 16 can be processed with high accuracy, and the primary side of the body 1 is assembled when the check valve is assembled. It is also possible to insert the ball valve body 10 into the body 1 from the opening side of the (connecting portion 2).

  FIG. 8 shows another embodiment, in which a plurality of communication holes 32 are formed in the outer peripheral surface of the body 1, and one air vent formed in the appropriate communication holes 32 and the outer peripheral surface of the insertion tube 13. An insertion tube 13 is fitted in the body 1 so as to communicate with the hole 14, and a ball non-return mechanism in which an internal thread 33 a of the cylinder portion 33 is screwed to the female screw 14 a of the air vent hole 14 through the communication hole 32. It is a valve. A pipe connection joint such as a female screw or a male screw for connection to the discharge pipe 31 is formed in the cylinder part 33 to connect the cylinder part 33 and the discharge pipe 31, but without using the cylinder part 33. The discharge pipe 31 may be directly connected to the female screw 14a. In addition, the effect in this example exhibits the effect substantially the same as said embodiment.

It is the front view which showed an example of the ball | bowl check valve in this invention. It is a longitudinal cross-sectional view of FIG. It is a rear view of FIG. FIG. 2 is a top view of FIG. 1. It is a partially cutaway sectional view of FIG. It is the isolation | separation perspective view which decomposed | disassembled and showed the non-return valve of FIG. It is a partially cutaway sectional view of a ball check valve showing an example of joining of an end connector of flange joining. It is a partial perspective view showing another example of a ball check valve. It is explanatory drawing which shows the example which mounted | wore the ball check valve in this invention in the manhole.

1 body
2, 3 Connection part 6 Retraction path 6a Opening 8 Lid 10 Ball valve body 16 Seating part 34 Ball guide 27 Submersible pump 29 Discharge pipe 30 Delivery pipe

Claims (3)

A ball valve body is housed in a body made of resin and having connecting portions at both ends, and this ball valve body is seated on a seating portion on the primary side in the body by back pressure of the sewage and is reversely locked. It is movably provided in the retreat path while being guided by the ball guide portion formed toward the secondary side in the body by the positive pressure of the body, and the opening provided above the body of the retreat path is detachable with a resin lid In addition to covering, a ball guide is formed integrally with the lid so as to project toward the seating portion side on the substantially central surface in the flow path direction of the inner peripheral surface of the lid, and the ball guide is parallel with a plurality of plate thicknesses. A resin ball check valve for sewage, which is provided on the inner peripheral surface of the lid so as to draw a gentle arc . The resin ball check valve for sewage according to claim 1 , wherein the ball guide is extended from the inner periphery of the lid so as to be along the seating portion side of the opening. The primary side of the ball check valve is joined to the vertical discharge pipe of the submersible pump placed in the manhole, the delivery pipe is joined to the secondary side of the ball check valve, and the ball check valve is installed in the vertical pipe. A manhole pump unit using the resin ball check valve for sewage according to claim 1 or 2 .

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