JP4450959B2 - Sewage pump device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewage pump apparatus installed in a sewage relay pumping station, a drainage pumping station, or the like, and more particularly to a sewage pumping apparatus that can reliably discharge air remaining in a sewage discharge pipe.
[0002]
[Prior art]
An example of a conventional sewage pump device is disclosed in Japanese Patent Application Laid-Open No. 11-193791. This is because the air vent passage 20 communicating with the inside of the discharge passage 10 of the pump and the pump casing 1 is provided, so that the air mixed in the pump casing 1 can be surely discharged and the idling of the pump can be prevented. Is.
[0003]
[Problems to be solved by the invention]
In the conventional sewage pump device, the air mixed in the pump casing can be discharged, but there is a problem that the air accumulated on the outlet side of the pump, that is, in the pumping pipe cannot be discharged. When the air accumulated in the pumping pipe, that is, the discharge pipe, flows back into the pump, it causes an idle operation of the pump. It will cause a flow.
[0004]
In order to remove air accumulated in the pump discharge pipe, some pump apparatuses branch off the discharge pipe and attach a check valve or an air vent valve. That is, a check valve that closes when a predetermined pressure is reached is attached, and low-pressure air below a predetermined pressure is discharged from the check valve, or when there is air, the valve opens and water closes. In addition, an air vent valve is attached to exhaust residual air to the outside.
[0005]
However, in the case where a check valve is attached to the branch pipe, the check valve continuously repeats the opening / closing valve due to pressure fluctuations during pump operation, causing significant noise or damage to the check valve. was there. On the other hand, in the case where an air vent valve is attached, foreign matter such as various solids and filth is mixed in the sewage, and the valve mouth is clogged by these foreign matter, making it impossible to discharge air. was there.
[0006]
Accordingly, an object of the present invention is to provide a sewage pump device that can reliably discharge air accumulated in a pump discharge pipe to the outside without causing vibration or clogging.
[0007]
[Means for Solving the Problems]
The means of the present invention taken in order to solve the above problems is a pump for discharging the sewage accumulated in the water tank, a discharge pipe connected to the pump, and a valve means by branching the discharge pipe. When the pump is driven with a hollow spherical float as a valve body and the front and back of the float valve body are within a predetermined differential pressure range due to the air exhaust flow , the valve means is excessive before the float valve body rises due to buoyancy of water. It is assumed that the valve seat is quickly closed and the valve is closed, and the pump is stopped and the valve is closed by buoyancy even if liquid flows into the valve means.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The sewage pump device of the present invention closes the valve means attached by branching the discharge pipe when the pump is driven with the hollow spherical float as a valve body and the front and rear of the float valve body are within a predetermined differential pressure range. Therefore, for example, when the pump is driven and the differential pressure value before and after the float valve body exceeds about 0.1 kg / square centimeter, before the water flows into the valve means, the float valve body is caused by the exhaust flow. Closes. Thus, before the sewage containing foreign matter flows into the valve means, the float valving closes prematurely due to the differential pressure, so that the sewage containing filth around the float valving Therefore, the float valve body can be prevented from being clogged with foreign matter.
[0009]
When the hollow spherical float valve body closes due to the differential pressure, the flat check valve body, which is relatively heavy like the check valve of the prior art, receives the gas flow of the predetermined differential pressure while opening the on-off valve. It does not repeat continuously and therefore does not generate vibrations or significant noise.
[0010]
【Example】
As shown in FIG. 1, a cylindrical water tank 2 to which a sewage inflow pipe 1 is connected, a submersible pump 3 for discharging sewage installed in the water tank 2, and a discharge pipe 4 connected to the outlet side of the submersible pump 3. And the wastewater pump apparatus is comprised with the exhaust valve 6 as a valve means attached to the branch pipe 5 connected to the discharge pipe 4. FIG.
[0011]
A bottom member 7 is attached to the bottom of the water tank 2 and the submersible pump 3 is installed above the bottom member 7. The suction port 9 of the submersible pump 3 is disposed in the recess 8 of the bottom member 7. A discharge pipe 4 is connected to a discharge port of the submersible pump 3 via a check valve 10 and a valve 11. Although the upper end 12 of the discharge pipe 4 is disposed in the water tank 2 in FIG. 1, it is connected to a discharge destination of sewage (not shown) outside the water tank 2.
[0012]
The sewage flowing into the water tank 2 from the sewage inflow pipe 1 is sucked from the suction port 9 when the water level in the water tank 2 reaches a predetermined high level, and is sucked out from the discharge pipe 4 to the outside of the system. The When the sewage is discharged and the water level reaches a predetermined low level, the pump 3 is automatically stopped. In FIG. 1, the water level is a position indicated by 13 and shows a state in which sewage flows from the sewage inflow pipe 1 into the water tank 2. In this state, the pump 3 is stopped and the water level 13 is gradually rising, and the exhaust valve 6 attached to the branch pipe 5 is opened and remains in the discharge pipe 4 as described later. Air is discharged into the water tank 2.
[0013]
As shown in FIG. 2, the exhaust valve 6 forms an exhaust valve casing having a valve chamber 17 therein by screwing an exhaust valve body 15 and an outlet member 16 together. An inflow port 18 is formed in the lower part of the exhaust valve body 15 and connected to the branch pipe 5 in FIG. An outlet 19 is formed in the upper part of the outlet member 16, and an annular valve seat 20 made of a synthetic resin is fixed to an end of the outlet member 16 on the valve chamber 17 side, and a hollow hollow spherical float 21 made of stainless steel in the valve chamber 17. Is placed in a free state. The state shown in FIG. 2 shows a state where the float 21 is separated from the valve seat 20 and is located at the bottom of the valve chamber 17.
[0014]
When a gas such as air flows from the inlet 18 of the exhaust valve 6 through the branch pipe 5 of FIG. 1, the hollow spherical float 21 is positioned at the bottom of the valve chamber 17 because buoyancy does not work. The gas is discharged to the outside from the outlet 19 through the central through portion of the valve chamber 17 and the valve seat 20. When the gas is discharged and a liquid such as water flows into the valve chamber 17, the float 21 is lifted by buoyancy and is seated on the valve seat 20 to prevent the liquid from being discharged to the outside.
[0015]
The exhaust valve 6 as the valve means attached to the branch pipe 5 is closed when the pump 3 is driven by using the hollow spherical float 21 as a valve body and the front and rear of the float valve body 21 are in a predetermined differential pressure range. Thus, for example, when the pump 3 is driven and the differential pressure value before and after the float valve body 21 exceeds about 0.1 kg / square centimeter, before the sewage flows into the exhaust valve 6 as the valve means, the float valve The body 21 is closed by the exhaust flow. In this way, before the sewage containing foreign matter flows into the exhaust valve 6, the float valve body 21 closes prematurely due to the differential pressure due to the exhaust flow, so that dirt or the like around the float valve body 21. The sewage containing water does not reach, and the clogging of the float valve body 21 with foreign matter can be prevented.
[0016]
When the hollow spherical float valve body 21 is closed by a differential pressure, a flat check valve body having a relatively large weight, like a conventional check valve, receives a gas flow of a predetermined differential pressure while opening and closing the valve. Are not repeated continuously, and therefore no vibration or significant noise is generated.
[0017]
In this embodiment, regarding the shape of the exhaust valve 6 shown in FIG. 2, the relationship between the height of the valve chamber 17: H, the inner diameter of the valve chamber 17: W, and the outer diameter of the float 21: L, that is, H / (W− An example in which L) is 1.4 will be shown. The numerical value of H / (W−L), which is the relationship between the dimensions, is preferably 0.5 or more and 3.5 or less, and more preferably in the range of 1.0 to 2.5. In the present embodiment, as shown in FIG. 2, the height: H of the valve chamber 17 is made relatively smaller than the outer diameter: L of the float 21, so that the outlet from the valve chamber 17 through the valve seat 20. The float 21 is prematurely seated on the valve seat 20 by the exhaust flow of the air discharged to 19, that is, before the float 21 is lifted by the buoyancy of water, By closing the foreign matter before the foreign matter reaches the valve seat 20 part, it is possible to prevent the float 21 and the valve seat 20 part from being clogged by the foreign matter.
[0018]
Further, since the distance between the inner diameter: W of the valve chamber 17 and the outer diameter: L of the float 21 is relatively large, foreign matters such as dirt are less likely to adhere during this time, and the float 21 is prevented from rising and falling. Reduce things.
[0019]
【The invention's effect】
As described above, the sewage pump apparatus according to the present invention can reliably discharge the air accumulated in the pump discharge pipe to the outside without causing vibration or clogging.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a sewage pump device according to the present invention.
FIG. 2 is a cross-sectional view of an exhaust valve as valve means used in the sewage pump device of the present invention.
[Explanation of symbols]
1 Sewage Inflow Pipe 2 Water Tank 3 Submersible Pump 4 Discharge Pipe 5 Branch Pipe 6 Exhaust Valve 17 Valve Chamber 18 Inlet 19 Outlet 20 Valve Seat 21 Spherical Float

Claims (1)

In the pump for discharging the sewage accumulated in the water tank, the discharge pipe connected to the pump, and the valve means by branching the discharge pipe, the pump is driven with the hollow spherical float as the valve body Then, when the front and rear of the float valve body are within a predetermined differential pressure range due to the exhaust flow of air , the float valve body is prematurely seated on the valve seat and closed before rising by the buoyancy of water , and A sewage pump device, wherein the pump is closed by buoyancy even if the pump stops and liquid flows into the valve means.

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