JP6962776B2 - Valve device - Google Patents

Description

The present invention relates to a valve device.

Conventionally, a valve device (in-tank stirring device) attached to a submersible pump device installed in a sewage relay pump tank (water tank) has been known (see, for example, Patent Document 1).

In Patent Document 1, from the start of operation of the submersible pump device to the elapse of a certain period of time, the jet flow from the submersible pump device is discharged from the discharge unit into the water tank via the valve device in the valve open state. A configuration is disclosed in which the inside of the water tank is agitated and the valve device is closed after a lapse of a certain period of time to stop the discharge of the jet flow from the valve device.

Specifically, when the valve is opened, the ball valve is located at the bottom of the valve accommodating portion while being placed on the diaphragm, while when the valve is closed, the diaphragm is displaced upward due to the negative pressure generated in the valve accommodating portion. The ball valve sits on the valve seat and closes the discharge section.

JP-A-2007-255287

By the way, in the conventional valve device, the ball valve repeatedly collides with the valve seat as the valve opens and closes, so that the valve seat is worn and the adhesion between the ball valve and the valve seat may be deteriorated. There is. Therefore, it was necessary to replace the valve seat on a regular basis.

However, since the valve seat is press-fitted and fixed to the upstream end opening located on the valve accommodating portion side of the discharge portion, it is difficult to remove the valve seat.

The present invention has been made in view of the above points, and an object of the present invention is to provide a valve device capable of easily performing valve seat replacement work.

In the present invention, a casing provided with a fluid inlet and outlet, a valve seat provided at the upstream opening of the outlet in the casing, and a position where the valve seat is seated and the outlet is closed. The following solutions have been taken for valve devices equipped with a ball valve that is movable from the valve seat to the position where the outlet is opened.

That is, in the first invention, the valve seat has a cylindrical valve body portion that is detachably fitted into the outlet and a downstream portion of the outlet in the casing that projects radially outward from the valve body portion. It has a flange portion that abuts on the peripheral edge of the side opening, and has a flange portion.
A sandwiching member that is detachably attached to the casing and holds the flange portion between the casing and the casing.
The sandwiching member is provided with a nozzle for discharging the fluid flowing out from the outlet to the outside of the casing .

In the first invention, the valve body of the valve seat is fitted from the outside of the casing toward the outlet, and the flange portion of the valve seat is in contact with the peripheral edge portion of the outlet. The flange portion is sandwiched between the casing and the holding member, so that the valve seat is detachably fixed to the casing.

With such a configuration, the valve seat can be easily replaced by removing the holding member from the casing and pulling out the valve seat fitted in the outlet to the outside of the casing.

Further, since the flange portion of the valve seat is sandwiched by the sandwiching member, the impact when the ball valve is seated on the valve seat can be dispersed over the entire surface of the flange portion and received by the sandwiching member.

The second invention is the first invention.
A sealing member is sandwiched between the casing and the holding member, which is radially outward from the flange portion.

In the second invention, the seal member is sandwiched between the casing and the sandwiching member at a radial direction outward from the flange portion. That is, in the present invention, the casing and the holding member are divided to sandwich the flange portion of the valve seat. Therefore, by sandwiching the sealing member so as to surround the flange portion, the sealing property of the divided surface is improved. I try to prevent the fluid from leaking out.

The third invention is the first or second invention.
The sandwiching member is detachably attached to the casing by fastening bolts fastened from the outside of the casing.

According to the present invention, the valve seat can be easily replaced by removing the holding member from the casing and pulling out the valve seat fitted in the outlet to the outside of the casing.

It is a side sectional view which shows the whole structure of the sewage pump equipment which installed the valve device which concerns on this embodiment. It is a top view of the submersible pump device and the valve device. It is a side sectional view of the valve device in a valve open state. FIG. 3 is a view corresponding to FIG. 3 showing a valve device in a state where the lower diaphragm is deviated. It is a figure corresponding to FIG. 3 which shows the valve device in a valve closed state. It is a side sectional view which shows the state which the valve seat was removed from a casing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use.

As shown in FIG. 1, a submersible pump device 2 is installed in a sewage relay pump tank 1 as a water tank having an inflow port 1a and a manhole 1b. A valve device 10 is connected to the submersible pump device 2. The valve device 10 discharges a part or all of the discharge flow into the tank at the start of operation of the submersible pump device 2, and functions as an in-tank agitator.

Then, when the water level of the sewage flowing into the sewage relay pump tank 1 from the inflow port 1a becomes a predetermined operation level or higher, the sewage is sucked into the submersible pump device 2 by the operation until the water level drops to a predetermined stop level. After that, it is discharged from the fixed discharge pipe 6.

As shown in FIG. 2, the discharge portion 4 of the submersible pump device 2 is formed so as to project laterally from the pump casing 3, and a detachable connection pipe 5 is attached to the tip thereof.

<About valve device>
As shown in FIG. 3, the valve device 10 includes a casing 11 provided with a water (fluid) inlet 16 and an outlet 17. The casing 11 is, for example, a casing main body 12 made of a metal material, and a lower cover portion 13 attached and fixed to the lower side of the casing main body 12 with a plurality of fastening bolts 40 (only one fastening bolt 40 is shown in FIG. 3). And a protective cover 32 attached and fixed on the upper side of the casing main body 12.

The lower cover portion 13 constitutes the bottom wall of the casing 11, and the bottom wall is formed in a convex curved surface shape protruding downward so as to accommodate the lower diaphragm 34 described later along the bottom wall.

Further, around the lower surface of the lower cover portion 13, a plurality of leg portions 13a (only one leg portion 13a is shown in FIG. 3) are provided so as to allow the valve device 10 to stand on its own on a flat surface. Further, inside the casing main body 12, a valve accommodating portion 14 having a lower cover portion 13 as a bottom is formed.

A cylindrical inflow pipe portion 15 is integrally provided on one side wall of the casing main body 12 (the side wall on the right side in FIG. 3). The inflow pipe portion 15 is arranged substantially in the center of the casing main body 12 in the vertical direction, and inside the inflow pipe portion 15, there is an inflow port 16 for introducing a jet of water discharged from the submersible pump device 2 into the valve accommodating portion 14. It is open.

That is, an inflow port 16 communicating with the valve accommodating portion 14 is formed inside the inflow pipe portion 15, and a jet flow flows from the pump casing 3 of the submersible pump device 2 into the valve accommodating portion 14 via the inflow port 16. It is designed to do. Further, the upstream end of the inflow pipe portion 15 is attached to the pump casing 3 of the submersible pump device 2.

An outlet 17 is formed on the other side wall of the casing body 12 (the left side wall in FIG. 3). The outflow port 17 is formed substantially in the center of the casing main body 12 in the vertical direction so as to face the inflow port 16 at the same height position. The jet that has flowed into the valve accommodating portion 14 from the inflow port 16 flows out of the valve accommodating portion 14 through the outflow port 17.

A valve seat 20 is provided at the upstream opening of the outlet 17 in the casing 11. The valve seat 20 hits the cylindrical valve body 21 that is detachably fitted into the outlet 17 and the peripheral edge of the downstream opening of the outlet 17 in the casing 11 that projects radially outward from the valve body 21. It has a flange portion 22 in contact with the flange portion 22.

The valve seat 20 is made of, for example, a material harder than the material constituting the casing main body 12. In this embodiment, as will be described later, the valve seat 20 is easily replaced, so that the valve seat 20 may be made of an elastically deformable rubber material or resin material. A tapered seat surface 21a that narrows inward in the radial direction from the upstream side to the downstream side is provided at the upstream side opening edge portion on the inner peripheral side of the valve body portion 21.

An inner seal groove 41 is formed on the inner peripheral surface of the outlet 17 in the casing main body 12. A ring-shaped inner seal member 42 is housed in the inner seal groove 41. In the state where the valve body portion 21 is fitted into the outlet 17, the inner seal member 42 comes into close contact with the valve body portion 21, and the gap between the outlet 17 of the casing body 12 and the valve body portion 21 is closed. There is.

The flange portion 22 of the valve seat 20 is sandwiched between the flange portion 22 and the casing 11 by the sandwiching member 25. The sandwiching member 25 is detachably attached to the casing 11 by a fastening bolt 40.

The sandwiching member 25 has a sandwiching portion 26 formed in a circular ring shape and sandwiching the flange portion 22, and a cylindrical outflow pipe portion 27 integrally provided at the downstream end portion of the sandwiching portion 26.

A recess 26a recessed at a depth substantially equal to the thickness of the flange portion 22 is provided on the upstream surface of the sandwiching portion 26. The flange portion 22 is sandwiched between the sandwiching portion 26 and the casing 11 in a state of being fitted into the recess 26a of the sandwiching portion 26.

An outer seal groove 43 is formed on the outer surface of the casing 11 in the radial direction with respect to the flange portion 22. A ring-shaped outer seal member 44 is housed in the outer seal groove 43. In a state where the flange portion 22 is sandwiched between the sandwiching member 25 and the casing 11, the outer sealing member 44 is in close contact with the sandwiching portion 26, so that the gap between the sandwiching member 25 and the casing body 12 is closed. The outer seal groove 43 may be formed in the sandwiching portion 26, and the outer seal groove 43 may be formed between the sandwiching portion 26, the casing body 12, and the valve seat 20 by providing a chamfer at the inner corner portion of the upstream end portion of the sandwiching portion 26. The gap of the formed substantially triangular cross section may be used as the outer seal groove 43.

The outflow pipe portion 27 discharges the jet flow that has flowed into the valve accommodating portion 14 from the inflow port 16 of the inflow pipe portion 15 to the outside of the valve accommodating portion 14. Further, a nozzle 19 for discharging the jet flow passing through the outflow pipe portion 27 into the sewage relay pump tank 1 is attached and fixed to the tip portion (downstream end) of the outflow pipe portion 27.

A substantially spherical ball valve 30 is movably housed in the valve accommodating portion 14. The ball valve 30 is located at the bottom of the valve accommodating portion 14 in a state of being mounted on the lower diaphragm 34 described later when the valve device 10 is opened (see FIG. 3), while the ball valve 30 is closed (see FIG. 5). (See) is configured to sit on the seating surface 21a of the valve seat 20 and close the outlet 17.

A plate-shaped lower diaphragm 34 forming the bottom of the valve accommodating portion 14 is attached between the casing main body 12 and the lower cover portion 13. The lower diaphragm 34 is, for example, made of rubber, and the lower peripheral portion thereof is sandwiched between the lower portion of the casing main body 12 and the upper peripheral portion of the lower cover portion 13, and the lower diaphragm 34 is airtightly under the casing main body 12. It is arranged on the side.

As shown in FIGS. 4 and 5, a lower oil chamber 35 for accommodating oil O for inflating the lower diaphragm 34 upward is formed between the lower diaphragm 34 and the lower cover portion 13. ..

Then, when a negative pressure is generated in the valve accommodating portion 14 by the jet flow, the central portion is biased upward due to the differential pressure between the negative pressure and the pressure in the lower oil chamber 35, and is located on the lower diaphragm 34. The ball valve 30 is pushed up, and the dynamic pressure of the jet flow flowing into the valve accommodating portion 14 is applied to the ball valve 30, so that the ball valve 30 is seated.

A similar upper diaphragm 31 is airtightly attached at the peripheral edge between the casing main body 12 and the protective cover 32. Specifically, a protective cover 32 is attached to the top of the casing body 12 to protect the upper diaphragm 31, and an upper portion is provided between the upper peripheral edge of the casing body 12 and the lower peripheral edge of the protective cover 32. The peripheral edge of the diaphragm 31 is hermetically sandwiched.

An upper oil chamber 33 for accommodating the oil O for operating the lower diaphragm 34 is formed between the casing main body 12 and the upper diaphragm 31.

The lower oil chamber 35 and the upper oil chamber 33 communicate with each other by an oil passage 36 formed by a casing main body 12, a lower cover portion 13, and a lower diaphragm 34. Then, due to the generation of negative pressure, the lower diaphragm 34 is biased so as to bulge upward (that is, the valve seat 20 side), and accordingly, the oil O from the upper oil chamber 33 to the lower oil chamber 35 via the oil passage 36. Is designed to move.

Further, the lower cover portion 13 is provided with an adjusting valve 37 for adjusting the flow rate of the oil O moving in the oil passage 36. The adjusting valve 37 adjusts the moving flow rate of the oil O between the upper oil chamber 33 and the lower oil chamber 35, and the operating time from the start of operation of the submersible pump device 2 until the ball valve 30 closes the outflow pipe portion 27. It is possible to adjust.

<About the operation of the valve device>
Next, the operation of the valve device 10 will be described. As shown in FIG. 3, in the stage before starting the submersible pump device 2, the ball valve 30 is located on the bottom portion (lower diaphragm 34) of the valve accommodating portion 14, and the outflow pipe portion 27 is opened in this state. The valve device 10 is in the valve open state. When the submersible pump device 2 is started in this valve open state, a part of the sewage from the pump casing 3 flows into the inside of the valve accommodating portion 14 through the inflow port 16 of the inflow pipe portion 15 and through the outflow pipe portion 27. A part of the sewage is ejected from the nozzle 19 into the sewage relay pump tank 1. As a result, the inside of the sewage relay pump tank 1 is agitated.

Then, as shown in FIG. 4, when the sewage passes through the valve accommodating portion 14, a negative pressure is generated in the valve accommodating portion 14, and the negative pressure causes the oil O to pass from the upper oil chamber 33 to the oil passage 36. To move to the lower oil chamber 35 (see the arrow shown in FIG. 4). Along with this, the upper diaphragm 31 descends. As a result, the lower diaphragm 34 is biased so as to bulge toward the valve seat 20 side located above, and the ball valve 30 is pushed up toward the valve seat 20 side located above the lower diaphragm 34.

When a predetermined time (for example, about 20 to 50 seconds) has elapsed from the start of operation of the submersible pump device 2, the lower diaphragm 34 is completely inflated and protrudes upward as shown in FIG. 4, and the ball is formed by the lower diaphragm 34. The valve 30 is pushed up, and the dynamic pressure of the jet flow flowing into the valve accommodating portion 14 acts to sit on the seat surface 21a of the valve seat 20 and close the nozzle 19 (see FIG. 5). As a result, the ejection of sewage from the nozzle 19 is stopped, and the sewage is pumped to the fixed discharge pipe 6 through the discharge portion 4 and the attachment / detachment connection pipe 5 (see FIGS. 1 and 2).

Then, as shown in FIG. 5, when the pressure in the valve accommodating portion 14 rises while the ball valve 30 is pressed against the valve seat 20, the lower diaphragm 34 is pushed back to the original state by the pressure, and the upper diaphragm 34 is pushed back to the original state. 31, the lower diaphragm 34 and the oil O return to their original positions (see the arrow shown in FIG. 5).

By such an operation of the valve device 10, sand, sludge, suspended oil, scum, etc. in the sewage relay pump tank 1 are agitated by the water ejected from the nozzle 19 for a predetermined time from the start of operation of the submersible pump device 2. After being sucked into the submersible pump device 2, it is discharged from the fixed discharge pipe 6. This makes it possible to prevent sand and sludge from accumulating or accumulating in the sewage relay pump tank 1, or to prevent floating fats and oils and scum from adhering to the wall of the sewage relay pump tank 1. It will be possible. Further, when the sewage in the sewage relay pump tank 1 is agitated, the sewage near the water surface is also agitated, so that oxygen from the atmosphere is actively supplied and aeration is promoted.

After that, when the operation of the submersible pump device 2 is stopped, the ball valve 30 is separated from the valve seat 20 and falls on the lower diaphragm 34, and the submersible pump device 2 returns to the state before the start. The time from the start of operation until the ball valve 30 closes the outflow pipe portion 27 can be changed by adjusting the adjusting valve 37.

<About valve seat replacement work>
By the way, when the valve device 10 is operated in this way, the ball valve 30 repeatedly collides with the valve seat 20 each time the submersible pump device 2 is started, so that the valve seat 20 may be worn or deformed. Therefore, in the present embodiment, the valve seat 20 can be easily replaced.

Specifically, as shown in FIG. 6, when replacing the valve seat 20, first, the fastening bolt 40 is loosened, and the holding member 25 together with the nozzle 19 is removed from the casing 11.

Then, the valve seat 20 is removed by pulling out the valve seat 20 fitted in the outlet 17 of the casing 11 to the outside of the casing 11. As a result, the valve seat 20 can be easily replaced from the outside of the casing 11. When replacing the valve seat 20, it is preferable to replace the inner seal member 42 and the outer seal member 44 together.

<< Other Embodiments >>
The embodiment may have the following configuration.

The valve device 10 according to the present embodiment has shown a form as an in-tank stirring device attached to the submersible pump device 2 in the sewage relay pump tank 1, but is not limited to this form. For example, the valve device 10 may be applied as a valve mechanism for adjusting the flow rate, a cleaning device in a tank, a sprinkler, a watering machine in a field, or the like as a valve mechanism for shielding after flowing a constant flow rate.

As described above, the present invention is extremely useful and has high industrial applicability because it has a highly practical effect that the valve seat can be easily replaced in the valve device.

10 valve device
11 Casing 16 Inlet 17 Outlet 20 Valve seat 21 Valve body 22 Flange 25 Holding member 30 Ball valve 44 Outer seal member

Claims (3)

From the casing provided with the fluid inlet and outlet, the valve seat provided at the upstream opening of the outlet in the casing, the position of sitting on the valve seat and closing the outlet, and the valve seat. A valve device with a ball valve that can be moved away from and to a position where the outlet is opened.
The valve seat abuts on a cylindrical valve body portion that is detachably fitted into the outlet and a peripheral edge portion of a downstream opening of the outlet in the casing that projects radially outward from the valve body portion. Has a flange and
A sandwiching member that is detachably attached to the casing and holds the flange portion between the casing and the casing.
A valve device provided on the sandwiching member and provided with a nozzle for discharging a fluid flowing out from the outlet to the outside of the casing. In claim 1,
A valve device characterized in that a sealing member is sandwiched between the casing and the holding member, which is radially outward from the flange portion. In claim 1 or 2,
The valve device is characterized in that the holding member is detachably attached to the casing by fastening bolts fastened from the outside of the casing.

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