JP2007255050A - Pump vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump vessel which efficiently agitates the interior thereof when stored water is drained by means of a submersible pump 2, and prevents adhesion of fats and fatty oils to a vessel internal wall surface, deposition of sludge, and remaining of scum in the vessel. <P>SOLUTION: The submersible pump 2 of the pump vessel 1 is provided with: a vessel interior agitator 3 for agitating the interior of the vessel by discharging part or all of pump discharge flow into the vessel over a constant time period at the beginning of operation of the submersible pump 2. Then a preliminary swirling vessel 4 is arranged on a vessel bottom having a revolving recess 16 into which the stored water flows while being swirled as the water level is lowered, and an intake port 20a of the submersible pump 2 is arranged in the revolving recess 16. Thus when the vessel interior agitator 3 is located above a location at which the swirling flow by the preliminary swirling vessel 4 is generated, it discharges part or all of the pump discharge flow into the vessel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a pump tank.

A pump tank provided with a pre-swivel tank at the bottom is generally known. For example, Patent Document 1 is provided with a partition wall that partitions a swiveling recess into which stored water flows while swirling in the tank circumferential direction as the water level decreases, and a water storage area that is higher than the swirling recess. It is described that a submersible pump is supported on the top of the head. In addition, the submersible pump may be provided with a tank agitation device that discharges part or all of the discharge flow of the submersible pump into the tank for a certain period of time when the submersible pump starts operation, and performs stirring in the tank. It is known (see Patent Document 2).
JP 2004-52396 A Japanese Patent Laid-Open No. 11-30198

    If the pre-swirl tank is provided at the bottom of the pump tank, the tank bottom can be cleaned. However, even if the submersible pump is started when the water level of the pump tank becomes high, almost no swirling flow is generated in the tank until the water level drops to the vicinity of the swivel recess. Cannot be obtained. For this reason, there is a problem that scum and oils and fats adhere to the inner surface of the tank near the submersible pump starting water level, increasing the burden of odor generation and periodic cleaning.

    On the other hand, when the tank agitator is attached to the submersible pump, the submersible pump can be agitated for a certain period of time when the submersible pump starts to operate, but the submersible pump itself is installed near the bottom of the tank. In the vicinity of the starting water level, the effect of peeling off oils and fats adhering to the inner surface of the tank or the pulverizing effect such as floating scum cannot be obtained sufficiently.

    Then, this invention makes it a subject to suppress the adhesion of fats and oils to the inner wall surface of a tank, the accumulation of sludge, and the residue of a scum by efficiently stirring the inside of a tank when discharging stored water with a submersible pump. .

    In order to solve such a problem, the present invention combines the above pre-swirl tank and the tank agitator, and the pre-swirl tank is responsible for stirring the bottom of the tank. The storage water above the vicinity of the height was agitated, and this division of roles enabled the interior of the tank to be washed effectively.

That is, the invention according to claim 1 is a pump tank provided with a submersible pump in the tank,
The tank is attached to the submersible pump, and includes a tank agitating device for stirring the tank by discharging a part or all of the discharge flow of the submersible pump into the tank for a certain time at the start of operation of the submersible pump,
A pre-swirling tank having a swirling recess into which the stored water flows while swirling as the water level decreases is formed in the tank bottom, and the suction port of the submersible pump is disposed in the swirling recess,
The tank agitator is provided so as to discharge a part or all of the discharge flow of the submersible pump into the tank at a position higher than a portion where the swirl flow is generated by the pre-swirling tank. To do.

    Therefore, when the submersible pump is started when the water level of the pump tank reaches a predetermined height, the upper part of the stored water is stirred by the jet water from the tank stirring device simultaneously with this startup. Thereby, floating scum can be destroyed, scum and oils and fats can be peeled from the tank inner surface, and oil and fats can be prevented from adhering to the tank inner surface in the vicinity of the starting water level. After a certain period of time has elapsed since the start of the submersible pump operation (after the ejection of water from the tank agitator has stopped), when the water level drops to the vicinity of the bottom of the tank due to the subsequent operation of the submersible pump, the stored water rotates and swirls. By flowing into the recess, the tank bottom is agitated, and sludge accumulation and scum residue are suppressed.

    In this way, the tank agitation device is sufficient to agitate the stored water above the height of the submersible pump, that is, it is not necessary to agitate the entire tank, so the agitation in the tank when the submersible pump is activated. The time for the device to eject water can be shortened. This means that the operation efficiency of the submersible pump is increased, that is, the inside of the tank can be drained in a short time, which is advantageous for energy saving without sacrificing cleaning in the tank.

    In addition, since the pre-swirl tank has the effect of reducing the residual water in the pump tank, it is advantageous for preventing dirt in the tank. By combining the pre-swirl tank and the tank agitation device, A higher cleaning effect in the tank can be obtained as compared with the case of adopting alone.

The invention according to claim 2 is the invention according to claim 1,
The discharge direction of the discharge flow of the agitation device in the tank is set obliquely upward.

    Therefore, for example, even when the pump tank is deep and the pump operation start level is at a position considerably higher than that of the submersible pump, the upper part of the stored water can be effectively stirred by the tank stirring device. It becomes easy to share the role of cleaning in the tank with the pre-swirl tank.

    As described above, according to the present invention, the pre-swirling tank is provided at the bottom of the tank, while the tank stirring device is provided so as to stir the tank at a position higher than the portion where the swirling flow is generated by the pre-swirling tank. Further, it is possible to effectively prevent the scum and oils and fats from adhering to the inner surface of the pump tank and the accumulation of sludge at the bottom of the pump tank, which is advantageous for energy saving.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a sewage relay pump tank, 2 is a submersible pump, 3 is a tank agitator attached to the submersible pump 2, and 4 is a pre-swirl tank provided at the bottom of the pump tank. The sewage that has flowed into the pump tank 1 from the inlet 5 is discharged from the discharge pipe 6 until the water level drops to a predetermined level by the operation of the submersible pump 2 when the water level becomes high. For the operation of the submersible pump 2, a water level detector (pressure sensor) 7 is provided in the pump tank 1, and a pump control device 8 is further provided. That is, when it is detected by the water level detector 7 that the water level has become equal to or higher than the start W ₀ (pump operation start level), the control device 8 starts the submersible pump 2 and the water level drops to a predetermined low level W ₁ . When it is detected, the control device 8 stops the submersible pump 2 after a predetermined time t from that point. Low level W1 and the time t in-water pump 2 is determined so as to stop when the water level drops to the vicinity of the bottom level W ₂ below the pivot recess 16.

    The submersible pump 2 is lowered from the manhole 11 of the pump tank 1 through the guide pipe 12 to the bottom of the tank, and is detachably installed in the tank by an attaching / detaching device 13. For raising and lowering the submersible pump 2, the lid 14 of the manhole 11 and the submersible pump 3 are connected by a raising and lowering chain 15. The detachable device 13 couples the submersible pump 2 to the discharge pipe 6 fixed in the pump tank 1, and the submersible pump 2 is installed in the pump tank 1 through the discharge pipe 6 by this connection.

    The pre-swirl tank 4 has a swiveling recess 16 into which the stored water flows while swirling as the water level decreases, and a storing portion 17 having a bottom surface higher than the swiveling recess 16. The turning recess 16 and the storage portion 17 are partitioned by a partition portion 18 and communicated by a water conduit 19. That is, as shown in FIG. 2, the partition 18 has a base end connected to the inner wall of the pump tank 1, extends around the swiveling recess 16 through the center of the tank bottom, and has a tapered tip. Thus, it ends at a position inside the inner wall of the pump tank 1. And between the wall of the outer peripheral side of this partition part 18 and the inner wall of a pump tank, it forms in the curved water conduit 19 extended along the inner wall of the pump tank 1 so that the storage part 17 and the turning recessed part 16 may be tied. ing. The water guide channel 19 is inclined downward from the storage unit 17 toward the turning recess 16.

    The suction pipe 20 of the submersible pump 2 is inserted into the swiveling recess 16 of the pre-swirling tank 4, and the suction port 20 a opens downward near the bottom of the swirling recess 16.

    The tank agitation device 3 is connected to the side wall of the submersible pump 2 as shown in FIG. 3, and a part (or all) of the discharge flow of the submersible pump 2 through the discharge flow introduction path 21 shown in FIG. .) Is introduced into the valve accommodating portion 22. The casing 23 of the in-tank agitation device 3 includes a casing body 24 in which a discharge flow introduction path 21 is formed and a diaphragm cover 25 coupled to the lower side thereof, and a protective cover 26 is provided on the upper side of the casing body 24. ing.

    A casing consisting of the casing main body 24 and the diaphragm cover 25 is partitioned by a lower diaphragm 28 into an upper valve accommodating portion 22 for accommodating a ball valve 29 and a lower oil chamber 32 for accommodating oil as a lower working fluid. Has been. The periphery of the lower diaphragm 28 is sandwiched between the casing body 24 and the diaphragm cover 25.

    On the other hand, a recess is formed at the top of the casing body 24, and the periphery of the upper diaphragm 33 is sandwiched between the periphery of the recess and the protective cover 26, so that the recess of the casing body 24 and the upper diaphragm 33 are sandwiched. Thus, an upper oil chamber 34 is formed. The protective cover 26 protects the upper diaphragm 33.

    The lower oil chamber 32 and the upper oil chamber 34 communicate with each other by an oil passage 35 formed in the casing body 24 and the diaphragm cover 25, and an adjustment valve 36 that adjusts the oil flow rate of the oil passage 35 is attached to the diaphragm cover 25. Yes.

    In the upper part of the casing body 24, an ejection hole 38 for ejecting a part of the pump discharge flow into the pump tank 1 is formed so as to face the discharge flow introduction path 21 with the valve accommodating portion 22 interposed therebetween. A valve seat 39 is formed at the inlet of the ejection hole 38, and a nozzle 41 is attached to the outlet side of the ejection hole 38. The outlet of the nozzle 41 is obliquely upward so that a part or all of the pump discharge flow is ejected to a position higher than the portion where the swirl flow is generated by the pre-swirling tank 4, and the jet flow is within the pump tank 1. It is set so as to hit the wall at an angle in plan view. The diaphragm cover 25 constitutes the bottom wall of the casing 23, and the bottom wall is formed in a convex curved shape that protrudes downward so that the lower diaphragm 28 is accommodated along the bottom wall.

    The operation of the in-vessel stirring device 3 will be described. Before the pump is started, as shown in FIG. 4, the ball valve 29 is below the valve storage portion 22 and the ejection hole 38 is open. When the submersible pump 2 is started in this state, a part of the pump discharge flow (sewage) flows from the pump casing into the valve accommodating portion 22 through the introduction path 21 and is ejected from the nozzle 41 into the pump tank 1.

    Then, when the pump discharge flow passes through the valve housing portion 22, a negative pressure is generated in the valve housing portion 22, and this negative pressure causes the oil to move from the upper oil chamber 34 to the lower oil chamber 32, and The diaphragm 33 descends, the lower diaphragm 28 rises, and the ball valve 29 begins to lift.

    When a certain time (for example, 20 to 50 seconds) has elapsed since the operation of the submersible pump 2, the lower diaphragm 28 protrudes upward, and the ball valve 29 is pushed up by the lower diaphragm 28 and comes into contact with the valve seat 39. The ejection hole 38 is closed. As a result, the ejection of sewage from the nozzle 41 stops, and the entire amount of the pump discharge flow flows to the discharge pipe 6. On the other hand, the inside of the valve housing portion 22 becomes positive pressure when the ball valve 29 is pressed against the valve seat 39, and the upper diaphragm 33, the lower diaphragm 28 and the oil return to the state before the pump is started. When the pump operation is stopped, the ball valve 29 is detached from the valve seat 39 and falls onto the lower diaphragm 28.

Therefore, according to the pump tank system, when the water level of the pump tank 1 is equal to or higher than the activation level W ₀ , this is detected by the water level detector 7 and the operation of the submersible pump 2 is started by the control device 8. By starting this operation, a part of the pump discharge flow is jetted into the pump tank 1 by the tank stirring device 3. Thereby, the inside of the tank is agitated, the floating scum 51 is destroyed, the floating oil and fat is agitated, and the oils and fats 52 and the scum adhering to the inner wall surface of the pump tank 1 near the pump activation water level are peeled off from the wall surface.

    In this embodiment, since the sewage is ejected from the nozzle 41 of the in-tank agitator 3 obliquely upward and so as to strike the inner wall surface of the pump tank 1 obliquely in plan view, the pump tank 1 is deep and the pump operation start level Even in the case where is located at a position considerably higher than the submersible pump 2, a swirling flow can be formed in the upper portion of the stored water by the jet flow. Therefore, destruction of the floating scum 51, dispersion of floating oils and fats, and separation of the oils and fats 52 from the inner wall surface of the pump tank proceed efficiently.

The ejection of sewage from the tank agitation device 3 ends when a certain time has elapsed from the start of operation of the submersible pump 2, and thereafter, the entire pump discharge amount is discharged to the outside from the discharge pipe 6. When the water level detector 7 detects that the water level has dropped to the predetermined low level W ₁ , the control device 8 stops the submersible pump 2 after a predetermined time t from that point. That is, the operation of the submersible pump 2 stops when the water level reaches the level W ₂ slightly above the lower end of the suction pipe 20 inserted into the swiveling recess 16 of the pre-swirling tank 4.

    Accordingly, as shown in FIG. 5, the submersible pump 2 is operating even when the water level drops to the position of the pre-swirl tank 4. In the pre-swirl tank 4, the stored water flows from the storage unit 17 through the inclined conduit 19 into the swivel recess 16 to generate a swirling flow of the stored water. As a result, the tank bottom, that is, the inside of the pre-swirl tank 4 is agitated, the accumulated sludge and scum are stirred and sucked into the suction pipe 20 of the submersible pump 2 and discharged from the discharge pipe 6. Therefore, sludge accumulation and scum residue on the tank bottom can be suppressed. Moreover, since the tank agitation device 3 only needs to agitate the stored water above the vicinity of the height of the submersible pump 2, for example, the regulating valve 36 increases the oil flow rate or the ball valve 29 is lightened. The sewage ejection from the tank agitator 3 into the tank is quickly rounded up to increase the operation efficiency (sewage discharge efficiency) of the submersible pump 2.

    As described above, in the present invention, the tank agitator 3 is responsible for the destruction of the floating scum 51 by the stirring of the upper part of the stored water, the dispersion of the floating oils and fats, and the separation of the oils 52 and the like from the inner wall surface of the pump tank. In other words, since the pre-swirl tank 4 is responsible for suppressing sludge accumulation and scum residue due to slag, the tank stirring device 3 is used exclusively for stirring the upper part of the stored water. The swirl tank 4 can be assigned a role in an appropriate manner for cleaning the tank, and the tank can be efficiently cleaned while improving the operation efficiency of the submersible pump 2, and the burden of odor generation and periodic cleaning is improved. This is advantageous for mitigation, and also improves the pump operation efficiency, which is advantageous for energy saving.

    In addition, although the pre-revolution tank 4 of the said embodiment has only one turning recessed part 16, it may have a some turning recessed part.

    Also, in the case where the pump operation start level is not so high with respect to the installation position of the submersible pump (position of the in-tank agitation apparatus 3), the nozzle 41 of the in-tank agitation apparatus 3 may be slightly lowered so as to Agitation of the stored water is possible.

    Moreover, this invention is applicable not only to a sewage relay pump tank but the pump tank which stores another liquid.

It is sectional drawing which shows a state with the high water level of the sewage relay pump tank system which concerns on embodiment of this invention. It is a top view which shows schematic structure of the pre-rotation tank of the system. It is a top view which shows the submersible pump with an in-vessel stirring apparatus and a discharge pipe of the same system. It is a longitudinal cross-sectional view of the stirring apparatus in the tank. It is sectional drawing which shows the state where the water level of the system is low.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump tank 2 Submersible pump 3 In-tank stirring apparatus 4 Pre-revolving tank 6 Discharge pipe 16 Turning recessed part 20 Intake pipe 20a Inlet 41 The nozzle of the in-tank stirring apparatus

Claims (2)

A pump tank with a submersible pump in the tank,
The tank is attached to the submersible pump, and includes a tank agitating device for stirring the tank by discharging a part or all of the discharge flow of the submersible pump into the tank for a certain time at the start of operation of the submersible pump,
A pre-swirling tank having a swirling recess into which the stored water flows while swirling as the water level decreases is formed in the tank bottom, and the suction port of the submersible pump is disposed in the swirling recess,
The tank agitator is provided so as to discharge a part or all of the discharge flow of the submersible pump into the tank at a position higher than a portion where the swirl flow is generated by the pre-swirling tank. To pump tank. In claim 1,
A pump tank, wherein a discharge direction of a discharge flow of the agitation device in the tank is set obliquely upward.

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