JPH05118084A - Sewage conveying pump unit - Google Patents

Abstract

PURPOSE:To collect approximately the whole quantity of suspended solids into a pit with the operation of a pump, to retain no suspended solids into a tank for a long time by discharging/conveying soil water having high density of suspended solids with the pump and to make it possible to prevent the generation of scum. CONSTITUTION:One or two units of pumps 5 are installed into a cylindrical tank 1, a pit 3 is so provided on the bottom of the tank 1 that a soil water surface area on the water level in the case of pump stopping is smaller than a soil water surface area on the water level in the case of pump starting, and from the upper end of the pit to the inside wall of the tank is formed of a rising slope 4. A part of pumping water of at least one unit of pump 5 is injected and run against the slope 4, mast of suspended solids is collected into the pit 3, and drainage/conveying is made by the pumps 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump unit in which a pump is installed in a cylindrical tank to discharge and transfer sewage, and particularly scum (oxidation of organic oils and fats and organic substances floating on the water surface). -Concerning the structure of the pump unit (unit body) that prevents the formation of a layered film caused by decay.

[0002]

2. Description of the Related Art Conventionally, in equipment for discharging and transferring dirty water by a pump installed in a cylindrical tank, a pit is provided in the lower part of the tank, and the water level in the tank is lowered by the pump operation to stop the pump. At that time, the surface area of sewage is reduced to collect suspended matter in the pit. However, even if the water level drops due to pump operation, there is no flow of sewage on the surface of the water, so the floating organic oils / organic substances do not change their mutual positions, and they drop as the water level drops. And it adheres to and remains on the slopes in the tank,
This is the cause of scum. Since the generation of scum is unavoidable in this way, scum removal work is performed by a vacuum vehicle or the like according to the situation of scum generation.

[0003]

In the above-mentioned conventional equipment, in the process of lowering the water level in the tank by operating the pump, the organic oil / fat / organic substance floating on the water surface in the tank is also Although the water level goes down as the water level drops, even if the water level goes down and reaches the pit formed at the bottom of the tank, there is almost no water flow on the water surface, so suspended matter remains on the slope from the tank inner wall to the pit end. Floating substances do not flow into the pit because they get on the vehicle, so even if the pit is provided, there is almost no change in the concentration of floating substances. Therefore, the amount of suspended matter contained in the sewage pumped in by the pump hardly increased even if the pit was provided, and the organic fats and organic substances floating on the water surface were decomposed while floating for a long time. However, there are problems such as thick layered scum, bad odor, and malfunction of the float switch for starting / stopping the sewage transfer pump, which necessitates regular cleaning.

According to the present invention, almost all the suspended matter is put in the pit as the pump is operated, and the wastewater having a high concentration of suspended matter is drained and transferred by the pump so that the suspended matter does not stay in the tank for a long time. Therefore, an object of the present invention is to provide a sewage transfer pump unit capable of preventing the generation of scum.

[0005]

In order to achieve the above-mentioned object, the present invention provides one or two pumps in a cylindrical tank, and pumps the sewage surface area at the water level at the time of starting the pump. In a sewage transfer pump unit that has a pit in the lower part of the tank so that the surface area of the sewage at the water level at the time of stoppage is small, the slope from the top of the pit to the inner wall of the pit is formed as a rising slope, and at least one pump It is characterized in that the part is jetted and collided with the slope.

A second aspect of the present invention is a wastewater transfer pump unit in which a pit is provided in the lower portion of the tank, wherein hot water is further provided in the pit, and a pump suction port is formed in the hot water downward in a nozzle shape. It was extended and inserted to further reduce the surface area of sewage when the pump was stopped, and to form a rising slope from the top of the pit to the inner wall of the tank so that part of the pumped water of at least one pump jets out and collides with the slope. It is characterized by

[0007]

Since the present invention is configured as described above, when only one pump is installed in the sewage transfer pump unit, two pumps are installed and alternate operation is performed every time the pump is operated. While the pump is running, at least once every two pump runs, part of the pumped water jets out and collides with the ascending slope. The water flow that collides with the ascending slope becomes an ascending flow along the inner wall of the tank, and the ascending flow comes to the water surface. When it reaches, it becomes a flow that pushes the suspended matter over the surface of the water, so that the suspended matter can be collected in one direction. Therefore, if the pit is provided at this position, most of the suspended matter can be collected in the pit.

Further, when a part of the pumped water is jetted toward the inner wall of the tank, if a certain angle is formed with the vertical plane extending from the center of the tank toward the inner wall of the tank, the jetted water collides with the ascending slope and is inclined upward. Therefore, the sewage in the tank will be swirled while rising along the inner wall of the tank by the jet water from the pump, and only a part of the pumped water will be jetted from one place, As it becomes a water flow that rises and swirls along, the suspended solids gather from the inner wall of the tank and gather in the center of the tank.

On the other hand, the sewage flows down from the center of the tank toward the bottom of the tank again, but suspended matter remains in the center, so if the pump lowers the water level, Most of the suspended matter is collected in the pit in the center. Since the suspended matter collected in the pit in this way is sucked and discharged together with the dirty water in the pit by the pump, a large amount of suspended matter is discharged by one operation of the pump.
The suspended matter in the tank is also discharged as the number of pump operations increases, so that the suspended matter does not stay in the tank for a long time, and scum can be prevented from occurring.

Further, according to the second aspect of the present invention, since the kettle hot water is further provided in the pit and the pump suction port is extended downward in a nozzle shape and inserted into the kettle hot water, a part of the pump pump water is pumped. However, it is spraying on the rising slope from the top of the pit to the inner wall of the tank, but if the water level in the tank drops to the inside of the kettle, the above-mentioned water will flow the suspended matter remaining on the pit floor into the kettle. A large amount of suspended matter can be transferred by sucking a large amount of air from the suction port nozzle of the pump inserted in the kettle and operating until the pump cannot be pumped.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a vertical sectional view of a sewage transfer pump unit showing an embodiment of a first invention of the present invention.

In the figure, a tank 1 has a cylindrical shape, an upper portion is opened, and a sewer pipe 2 is connected to an intermediate portion of a side wall of the tank 1.
A pit 3 having a diameter smaller than the inner diameter of the tank is formed in the inner lower portion, and the upper end of the pit 3 and the inner wall of the tank are connected by a rising slope 4. A guide having one or two pumps (submersible pumps) 5 driven by an electric motor (two in this embodiment) with an inlet opening to the pit 3 and an upper end of which is attached near the tank opening. It is removably attached to the attachment / detachment device 6 having a rod 6a, and is guided to the outside of the tank 1 through a vertical discharge pipe 7, a check valve 8, a discharge valve 9, and a horizontal discharge pipe 10.

As shown in FIG. 3, two pumps 5 (5a, 5b) are arranged side by side. Each pump has a hole 12 formed in a part of a casing 11 as shown in FIG. A part of pump water is ejected from the hole 12 as shown by arrows 13a and 13b, and a pump impeller 14 is also provided.
It is configured by a vortex type pump that enlarges the gap between the casing 11 and the casing 11 to allow foreign matters having a large particle diameter to pass therethrough. Even if the pump 5 is not pumped, the stirring heat generated by stirring the water by the impeller 14 gradually raises the temperature to reach the allowable temperature.
You can continue driving. In FIG. 1, 15 is dirty water, 16 is a pump start float switch, 17 is a pump stop float switch, 18 is a manhole cover, 19 is a chain, and in FIG. 4, 20 is a gland side cover, and 21 is a shaft. Is.

Next, the operation will be described. The amount of the sewage 15 flowing into the tank from the sewer pipe 2 connected to the tank 1 increases with time and the water level rises. When the water level rises and the pump start float switch 16 operates, the pump 5 installed in the tank starts operating, and the discharged dirty water passes through the flow path in the attachment / detachment device 6 and the vertical discharge pipe 7 The check valve 8, the discharge valve 9 and the horizontal discharge pipe 10 flow, and the waste water is transferred from the horizontal discharge pipe 10 to the external waste water transfer pipe.
When the pump 5 is operated, the sewage 15 in the tank 1 is discharged and transferred, the water level is lowered to the pump stop float switch 17, and when the pump stop float switch 17 is activated, it is incorporated into a pump control panel (not shown). The pump stop timer is started. Even when the timer starts to operate, the transfer pump continues to operate until the timer set time is reached and the operation ends. When the timer reaches the preset time and the timer stops operating, the control circuit operates and the transfer pump 5 stops operating. From the time the pump stop float switch 17 is actuated until the timer ends, the transfer pump 5 continues to operate, so the water level in the tank 1 continues to drop, and the water level is almost the same as the pump suction port. When it drops to the level, the pump 5 sucks in a large amount of air and cannot pump water, but continues to operate as it is, the timer finishes operating, and the pump 5 also stops. As described above, by operating the pump up to a limit state where it is impossible to pump water by sucking a large amount of air, it is possible to suck and transfer a large amount of suspended matter.

During heavy rain, the inflow from the sewer pipe 2 also increases, so the pump 5 is operated from the activation of the pump stop float switch 17 to the set time of the pump stop timer.
Even if the pump is operated, the water level in the tank may not decrease to the level at which the pump draws in a large amount of air and makes it impossible to pump water.However, in such a case, the concentration of organic oils and fats and organic substances may flow in. Since it is diluted by the rainwater that does not generate scum, there is no problem even if you can not drive to the water level where you cannot pump water.

When the pump is stopped by reaching the set time of the pump stop timer, the water level in the tank starts to rise again due to the inflowing sewage from the sewer pipe 2. When the water level rises and the pump start float switch 16 operates, the pump 5 starts operating and starts transferring dirty water.

When two pumps are installed and alternately operated as shown in FIG. 3, the previously operated pump 5a remains stopped and the adjacent pump 5b starts the operation so that the inside of the tank is stopped. Transfer sewage. The water level drops to the pump stop float switch 17, the timer is activated, and the pump 5b stops after the set time has elapsed. After that, the pumps 5a and 5b are alternately operated.

With the operation of the pump 5, the jet water 13a jetted from the hole 12 formed in the casing 11 of the pump 5a is jetted at an angle A with the vertical plane with respect to the wall of the tank 1, and the pump 5b. The water 13b is sprayed at an angle B with the vertical surface with respect to the wall of the tank 1, and this spray causes an upflow and a swirl flow along the inner wall of the tank. When there are two pumps, the pumps are distributed to the center of the tank 1, so that even if the injection angle of one pump, for example, the angle A becomes zero (injects vertically to the tank wall), the other pumps Since the injection angle of is not zero, upflow and swirl flow occur for the operation of at least one pump.

Further, in the case of one pump, when the injection is vertical to the tank wall, it can be dealt with by moving the pit 3 to one side wall. The sewage transfer unit removes the manhole cover 18 of FIG. 1 and pulls up the chain 19 attached to the pump 5 to pull up only the pump 5 to the ground with the guide rod 6a as a guide while leaving the attaching / detaching device 6 in the tank. It has a structure that allows it.

According to this embodiment, a part of the pumped water of at least one pump installed in the tank by the sewage transfer pump unit is jetted and collided with the rising slope 4 from the upper end of the pit 3 to the inner wall of the tank. Ascending flow, or ascending flow and swirling flow are generated, and when this flow reaches the water surface, the flow is generated on the water surface, so the suspended matter is collected by the flow,
When the water level is lowered by the operation of the pump 5, most of the suspended matter can be collected in the pit 3 provided in the tank 1. Since the floating material collected in this way is transferred by a pump, the floating material does not stay in the tank for a long time, and scum can be prevented from occurring.

FIG. 2 is a longitudinal sectional view showing another embodiment according to the second aspect of the invention. In the figure, the same reference numerals as those shown in FIG. 1 indicate the same or similar parts, Only points different from the embodiment will be described. In this example,
In the pit 3 provided at the bottom of the tank 1, a kettle (recess) 22 having a smaller horizontal cross-sectional area is provided, and inside the kettle 22,
A suction port nozzle 23, which is an extended suction port of the pump 5, is inserted.

According to this embodiment, a part of the pumped water is sprayed onto the ascending slope 4 from the upper end of the pit 3 to the inner wall of the tank, but when the water level becomes low in the kettle water 22, this sprayed water is injected. Floats the suspended matter remaining on the floor of the pit 3 into the kettle water 22, so that the water level drops to the pump stop float switch 17 and the timer for pump stop (not shown) is activated until the set time is reached. In the meantime, a large amount of air can be transferred by sucking a large amount of air from the suction port nozzle 23 inserted in the kettle and operating until it becomes impossible to pump water.

In the above-described embodiment, as a means for ejecting a part of the pumped water discharged from the pump to the ascending slope 4,
The structure in which the hole 12 is formed in the pump casing 11 and a part of the pump discharge pumped water is ejected from the hole 12 has been described. However, the pump discharge pipe 7 may be provided with a hole or the discharge pipe 7 may be branched. Of course, there are various means such as providing a pipe.

[0024]

As described above, according to the present invention,
One or two pumps are installed in a cylindrical tank, and a pit is provided in the lower part of the tank so that the surface area of the water when the pump is stopped is smaller than the surface area of the water when the pump is started. In the transfer pump unit,
Most of the suspended matter is collected in the pit in the tank by forming a rising slope from the top of the pit to the inner wall of the tank, and by jetting a part of the pumped water of at least one pump against the slope. The suspended matter thus collected can be transferred to the outside by a pump to prevent the suspended matter from staying in the tank for a long time, and to prevent scum from occurring.

According to the second aspect of the invention, the pit floor is further provided by further providing the hot water in the pit and inserting the pump suction port downward in a nozzle shape into the hot water. Since the floating matter remaining on the surface can be poured into the hot water by the jet water, a large amount of floating matter can be efficiently transferred from the suction port nozzle of the pump.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a sewage transfer pump unit showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a wastewater transfer pump unit showing an embodiment of a second invention of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIGS. 1 and 2.

FIG. 4 is a vertical sectional view showing an embodiment of a pump used in the present invention.

[Explanation of symbols]

 1 tank 2 sewage pipe 3 pit 4 inclined surface 5, 5a, 5b pump 6 attachment / detachment device 7 vertical discharge pipe 10 horizontal discharge pipe 11 pump casing 12 holes 13a, 13b jet water 14 impeller 15 waste water 16 pump start float switch 17 pump Float switch for stop 18 Manhole cover 19 Chain 22 Hot water 23 Suction port nozzle

Claims (2)

[Claims] 1. One or two pumps are installed in a cylindrical tank, and the lower surface of the tank has a smaller surface area when the pump is stopped than the surface area when the pump is stopped. In a sewage transfer pump unit provided with a pit, the sewage is characterized in that an upper slope from the pit upper end to an inner wall of the tank is formed as an ascending slope, and a part of pumped water of at least one pump is jetted and collided with the slope. Transfer pump unit. 2. One or two pumps are installed in a cylindrical tank, and the lower surface of the tank has a smaller surface area when the pump is stopped than the surface area when the pump is stopped. In a sewage transfer pump provided with a pit, kettle hot water is further provided in the pit, and a pump suction port is extended downward into a nozzle shape and inserted into the kettle hot water to further reduce the sewage surface area when the pump is stopped. A sewage transfer pump unit, characterized in that a sloping slope is formed from the upper end of the pit to the inner wall of the tank, and a part of pumped water of at least one pump is jetted and collided with the slope.