JP2007029829A - Stirring device in pump tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promote an aeration together with a stirring of wastewater to suppress a generation of hydrogen sulfide in the wastewater. <P>SOLUTION: A stirring device 4 in a pump tank is attached to a submerged pump device 2 installed in the pump tank 1, and allows a part or all of a jet flow of the submerged pump device 2 to discharge in the pump tank 1 for a given period of time when the submerged pump device 2 starts to operate to carry out the stirring in the pump tank 1. The stirring device 4 in the pump tank is provided with an ejector mechanism 34 mixing air in the jet flow circulating in a discharge section 33 to discharge the jet flow with air mixed in by the ejector mechanism 34 into the pump tank 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an agitation device in a pump tank that is attached to a submersible pump device and discharges a jet for a predetermined time at the start of submersible pump operation to agitate the water tank.

  The agitation device in the pump tank discharges a jet for a certain time at the start of submersible pump operation and agitates the water tank, so that sand, sludge, floating oil and fat, scum, etc. in the water tank can be discharged by the subsequent pump operation. . Therefore, sand or sludge stays or accumulates in the water tank, and floating oil and fat and scum are prevented from adhering to the tank wall and the like, and the effect of cleaning the inside of the tank by the tank stirring device is obtained.

There exists what was disclosed by patent document 1 as such a tank stirring device. In the tank agitation apparatus according to Patent Document 1, when the submersible pump starts operation, a jet flow from the submersible pump flows into the tank agitation apparatus, and this jet stream is discharged into the water tank to stir the inside of the water tank. The Eventually, the ball valve inside the tank stirring device closes the outflow hole due to the negative pressure of the jet flow, and stops the discharge of the jet flow from the tank stirring device.
Japanese Patent No. 3570861

  By the way, the sewage in the water tank contains a sulfur compound (sulfate ion), and this sulfur compound becomes hydrogen sulfide by the action of bacteria under anaerobic conditions. In recent years, odors in the pump tank due to hydrogen sulfide and corrosion of buried pipes from which sewage is discharged have become problems.

  In the tank agitation apparatus according to Patent Document 1, oxygen is supplied from the air to the sewage near the water surface (aeration) by agitation of the sewage in the water tank by the agitation apparatus in the pump tank. By this aeration, generation of hydrogen sulfide is suppressed. However, in such a method, aeration is performed only in the vicinity of the water surface, and aeration may be insufficient.

  Moreover, in the tank stirring apparatus which concerns on patent document 1, in order to make the stirring of the sludge settled in the bottom part of a water tank, and the stirring (aeration) of a water surface compatible, the discharge amount corresponding to it is required. Therefore, especially when the amount of water in the water tank is large, the difference in water level between the bottom and the water surface becomes large, so that either of stirring of sludge or the like at the bottom and stirring of the water surface may be insufficient. .

  This invention is made | formed in view of this point, The place made into the objective is to accelerate | stimulate aeration with the stirring of sewage and to suppress generation | occurrence | production of hydrogen sulfide in sewage.

  In the present invention, in order to promote stirring and aeration in the water tank, a jet mixed with air is discharged into the water tank.

  The present invention is attached to a submersible pump device installed in a water tank, and a part or all of a jet of the submersible pump device is discharged into the water tank for a certain time at the start of operation of the submersible pump device. The target is a stirring device in a pump tank that performs stirring.

  And the air mixing part which mixes air in the said jet flow introduce | transduced into this pump tank stirring apparatus is provided, and the jet flow in which air was mixed by this air mixing part shall be discharged in the said water tank.

  In the case of the above configuration, the discharge flow discharged from the agitation device in the pump tank into the water tank contains air mixed in from the air mixing part, and the discharge flow simultaneously stirs the sewage in the water tank. Aeration is performed to aerobate sewage. Thereby, generation of hydrogen sulfide gas is suppressed.

  Moreover, since air is mixed in the discharge flow for stirring the sewage, not only the surface of the sewage is aerated with the atmosphere above the sewage, but also oxygen can be supplied to the sewage at the bottom in the water tank for aeration. Furthermore, since aeration is performed simultaneously with stirring, not only oxygen is simply sent to the bottom of the water tank, but oxygen can be more actively supplied into the sewage.

  Furthermore, by promoting aeration, decomposition of organic substances by aerobic bacteria is promoted, and generation of malodor in the pump tank can be suppressed.

  Furthermore, since the air mixed in the jet is bubbled and discharged into the water tank, a device that discharges a discharge flow that does not contain bubbles into the water tank, such as a pump tank agitator according to Patent Document 1. In comparison, the stirring efficiency of sewage can be improved.

  A second invention further includes an inflow portion into which a jet flows from the submersible pump device according to the first invention, and a discharge portion having a discharge port for discharging the jet flowing into the inflow portion into the water tank, The aeration unit is an ejector mechanism that is provided near the discharge port and sucks air into the jet by an ejector effect of the jet flowing through the discharge.

  In the case of the above configuration, the aeration unit converts a part of the velocity energy of the jet flowing through the discharge unit into pressure energy, sucks air by the pressure energy, and mixes the air into the jet (ejector) effect). Since this ejector mechanism does not require a power source for mixing air into the jet, it is miniaturized and no power reception is required, and its installation is easy and the running cost is reduced. That is, since air is mixed into the discharge flow by the ejector mechanism of the discharge unit, it is possible to realize positive aeration by the discharge flow that stirs sludge and the like at a low running cost.

  According to the present invention, air is contained in a discharge flow that is stirred in the water tank by mixing air into the jet flow that is discharged from the water tank pump device to the stirring device in the pump tank and is mixed into the water tank. Therefore, when the sewage in the water tank is stirred, aeration can be performed at the same time, and generation of hydrogen sulfide gas can be suppressed. Moreover, decomposition | disassembly of the organic substance by aerobic bacteria can be accelerated | stimulated and generation | occurrence | production of malodor other than hydrogen sulfide in a pump tank can also be suppressed. As a result, the generation of malodor in the pump tank and the corrosion of the buried pipe can be suppressed.

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

  In FIG. 1, 1 is a sewage relay pump tank (hereinafter also referred to as a pump tank) as a water tank, and 2 is a submersible pump apparatus (hereinafter referred to as an underwater pump) with a tank stirring apparatus in which a tank stirring apparatus 4 is attached to a submersible pump body 3. It is called a pump device). The sewage that has flowed into the pump tank 1 from the inlet 5 is discharged from the fixed discharge pipe 6 until the water level drops to a predetermined stop level by the operation of the submersible pump device 2 when the water level exceeds a predetermined operation level. The For the operation of the submersible pump device 2, an operation float 7, a stop float 8 and an abnormal water level alarm float 9 are provided in the pump tank 1, and a control panel 10 is provided above the pump tank 1. .

  The submersible pump device 2 is lowered from the manhole 11 of the sewage relay pump tank 1 to the bottom of the tank through the guide pipe 12, and is detachably installed on the sewage relay pump tank 1 by the attaching / detaching device 13. For raising and lowering the submersible pump device 2, the lid 14 of the manhole 11 and the submersible pump main body 3 are connected by a raising and lowering chain 15. The lifting / lowering chain 15 is connected to the top surface portion of the submersible pump main body 3 on a vertical line passing through the center of gravity of the submersible pump device 2. The detachable device 13 couples the submersible pump device 2 to a fixed discharge pipe 6 fixed in the pump tank 1, and the submersible pump device 2 is supported by the fixed discharge pipe 6 by this connection.

  That is, as shown in FIG. 2, the attachment / detachment device 13 includes an attachment / detachment connection pipe 23 having an attachment / detachment flange portion 16 and a hook 17 provided in the ejection portion 31 of the submersible pump main body 3 of the submersible pump device 2, and a fixed discharge pipe. 6 base end flange portions 18. The hook 17 forms an engaging recess opening downward with the upper portion of the detachable flange portion 16, and an engaging portion 18 a that fits into the engaging recess is formed on the upper portion of the proximal flange portion 18 of the fixed discharge pipe 6. Is formed. The submerged pump device 2 is supported by the fixed discharge pipe 6 by the engagement between the engaging recess and the engaging portion 18 a, and the detachable flange portion 16 is attached to the proximal flange portion of the fixed discharge pipe 6 by the weight of the submersible pump device 2. The moment which presses to 18 acts, and both are connected without gap. The abutment surfaces of the hook 17 and the engaging portion 18a are tapered to guide the fitting and to connect the flange portions 16 and 18 closely.

  As shown in FIG. 3, the jet part 31 of the submersible pump main body 3 is formed so as to protrude laterally from the pump casing 3 a of the submersible pump main body 3, and the detachable connecting pipe 23 is attached to the tip. Yes. The detachable connecting pipe 23 is provided with a guide 24 slidably engaged with the detachable flange portion 16 and the guide pipe 12. As shown in FIG. 3, there are two guide pipes 12, and two guides 24 are provided on the connecting / disconnecting pipe 23.

  The tank stirring device 4 will be described. This is to discharge a part or all of the discharge flow of the submersible pump main body 3 into the tank at the start of operation of the submersible pump device 2. As shown in FIGS. 3 and 4, the casing 30 includes a casing main body 45 attached to the pump casing 3 a of the submersible pump main body 3 and a diaphragm cover 46 coupled to the lower side of the casing main body 45. A protective cover 47 is provided.

  As shown in the figure, a casing 30 comprising a casing main body 45 and a diaphragm cover 46 has an upper valve accommodating portion 51 for accommodating a ball valve 49 and a lower lower portion for accommodating oil as a working fluid by a lower diaphragm 48. The oil chamber 52 is partitioned. The peripheral edge of the lower diaphragm 48 is sandwiched between the casing body 45 and the diaphragm cover 46.

  On the other hand, a recess is formed at the top of the casing body 45, and the periphery of the upper diaphragm 53 is sandwiched between the periphery of the recess and the protective cover 47, so that the recess of the casing body 45 and the upper diaphragm 53 are located. Thus, an upper oil chamber 54 is formed. The protective cover 47 protects the upper diaphragm 53.

  The lower oil chamber 52 and the upper oil chamber 54 communicate with each other by an oil passage 55 formed in the casing body 45 and the diaphragm cover 46, and an adjustment valve 56 that adjusts the oil flow rate of the oil passage 55 is attached to the diaphragm cover 46. Yes.

  An inflow portion 32 for introducing the jet of the submersible pump main body 3 into the casing main body 45 is provided at the upper portion of the casing main body 45. The casing body 45 is attached to the pump casing 3 a of the submersible pump body 3 by a flange 32 a formed at the upstream end of the inflow portion 32. A flow passage 57 for communicating the submersible pump main body 3 and the valve housing portion 51 is formed inside the inflow portion 32, and the valve housing portion is connected from the submersible pump main body 3 via the jet passage 57. A jet flows into 51.

  On the other hand, on the opposite side of the inflow part 32 in the upper part of the casing main body 45, a discharge part 33 through which the jet flowing in from the inflow part 32 flows out is provided. The discharge unit 33 includes an ejector mechanism 34 that sucks air into the jet by an ejector effect of the jet flowing through the discharge unit 33, and a discharge that discharges the jet mixed with air by the ejector mechanism 34 into the pump tank 1. And a nozzle 35 having an outlet 35a.

  The ejector mechanism 34 is provided from an outer side in the radial direction with respect to the main body tube 34b, an outflow portion 34a for letting the jet flow out of the valve accommodating portion 51, a main body tube 34b attached to the downstream end of the outflow portion 34a. The air introduction part 34c and the air hose 34d attached to this air introduction part 34c are provided.

  The outflow portion 34 a is formed with an outflow hole 58 that communicates with the valve housing portion 51, and a valve seat 59 on which a ball valve 49 can be seated is provided at the upstream end of the outflow hole 58. The outflow portion 34a is formed with a small diameter portion 34e having a reduced outer diameter at the downstream end, and the main body pipe 34b is outflowed with a gap in the radial direction between the small diameter portion 34e. It is attached to the part 34a. At this time, the main body tube 34b is fitted to the outflow portion 34a from the outside, and the inner diameter thereof is formed larger than the inner diameter of the outflow portion 34a. And the air introduction part 34c is provided in the position corresponding to the clearance gap with the said small diameter part 34e of the main body pipe | tube 34b. The air introduction part 34c has a downstream end that opens into the body tube 34b, and an upstream passage that is connected to the air hose 34d. The air hose 34d extends to the submersible pump body 3 along the casing body 45, and then extends to the top of the pump tank 1 along the lifting chain 15 connected to the submersible pump body 3 (see FIG. 1). A nozzle 35 is attached to the downstream end of the ejector mechanism 34.

  The ejector mechanism 34 configured as described above is configured such that the jet flow in the valve accommodating portion 51 passes through the outflow portion 34a, thereby increasing the flow velocity of the jet flow and lowering the static pressure via the air introduction portion 34c. Air is sucked into the main body tube 34b from the air hose 34d. The sucked air is mixed into the jet as fine bubbles in the main body pipe 34b, and is discharged into the pump tank 1 from the nozzle 35 together with the jet.

  The diaphragm cover 46 constitutes the bottom wall of the casing 30, and this bottom wall is formed in a convex curved shape that protrudes downward to accommodate the lower diaphragm 48 along the bottom wall. Thus, around the bottom wall, there are provided three legs 62 and 62 constituting an installation part for allowing the in-vessel stirring device 4 to stand on a flat surface (only two are shown in FIG. 4). .

  A bulging portion that bulges downward and extends between the upper portion of the leg 62 and the convex curved bottom wall is formed on the inner side of one of the three legs 62, 62. A mounting portion 63 of the regulating valve 56 is formed by 62 and the bulging portion. That is, an adjustment valve attachment hole extending from the outer surface of the leg 62 to the bulging portion is formed, and the adjustment valve 56 is screwed into the attachment hole.

  In order to explain the operation of the in-vessel stirring device 4, before starting the pump, the ball valve 49 is below the valve storage 51 and the outflow hole 58 is open as shown by the solid line in FIG. When the submersible pump main body 3 is started in this state, a part of the sewage flows from the pump casing 3a into the valve accommodating part 51 through the jet passage 57 and is ejected from the nozzle 35 into the pump tank 1 through the outflow hole 58. To do. Thereby, the inside of the pump tank 1 is stirred.

  Then, when the sewage passes through the valve accommodating portion 51, a negative pressure is generated in the valve accommodating portion 51, and the oil moves from the upper oil chamber 54 to the lower oil chamber 52 by this negative pressure. The upper diaphragm 53 is lowered, the lower diaphragm 48 is raised, and the ball valve 49 starts to be lifted (see the two-dot chain line in FIG. 4).

  When about 20 to 50 seconds elapse from the start of operation, the lower diaphragm 48 protrudes upward, and the ball valve 49 is pushed up by the lower diaphragm 48 and abuts against the valve seat 59 to close the outflow hole 58 (one point in FIG. 4). (See chain line). Thereby, the ejection of sewage from the nozzle 35 stops, and the sewage flows to the fixed discharge pipe 6 through the ejection part 31 and the connecting / disconnecting connection pipe 23. On the other hand, the inside of the valve accommodating part 51 becomes positive pressure when the ball valve 49 is pressed against the valve seat 59, and the upper diaphragm 53, the lower diaphragm 48, and the oil return to the state before starting the pump. When the pump operation is stopped, the ball valve 49 leaves the valve seat 59 and falls onto the lower diaphragm 48. The time from the start of operation until the ball valve 49 closes the outflow hole 58 can be adjusted by adjusting the adjusting valve 56.

  Therefore, sand, sludge, floating oil and fat, scum and the like in the pump tank 1 are stirred by the jet flow and discharged from the fixed discharge pipe 6 by the operation of the tank stirring device 4. For this reason, it is suppressed that sand or sludge stays or accumulates in the water tank, and floating oil or fat or scum adheres to the tank wall or the like.

  Further, when the sewage in the pump tank 1 is agitated, the sewage near the water surface is also agitated, so that oxygen is actively supplied from the atmosphere and aeration is promoted.

  Thus, in the said embodiment, since air is mixed in the discharge flow discharged in the pump tank 1 from the tank stirring apparatus 4 by the ejector mechanism 34, this discharge flow is the sewage in the pump tank 1. At the same time, aeration is performed to aerobicize. In addition, the nozzle 35 of the tank agitation device 4 is generally configured so that a discharge flow is discharged toward the bottom of the pump tank 1 to stir sludge and the like at the bottom of the pump tank 1. Since air is mixed in this discharge flow, aeration can be performed while stirring sludge, and aeration can be performed very efficiently. Furthermore, from the viewpoint of stirring, since the discharge flow contains bubbles, the stirring efficiency can be improved. And generation | occurrence | production of hydrogen sulfide gas can be suppressed by agitating and aeration in this way. In addition, the decomposition of organic substances by aerobic bacteria is promoted, and the generation of malodor other than hydrogen sulfide can be suppressed. As a result, the generation of malodor in the pump tank 1 and the corrosion of the fixed discharge pipe 6 and the buried pipe downstream thereof can be suppressed.

  Moreover, in the said embodiment, a part of velocity energy of the jet which distribute | circulates the discharge part 33 is converted into pressure energy by performing mixing of the air to the jet in the tank stirring device 4 by the ejector mechanism 34, Since air is sucked in by the pressure energy and air is mixed into the jet, the configuration of the device for mixing air is reduced in size and power reception is not required, and installation on the tank stirring device 4 is easy. The running cost can be reduced.

  In the above embodiment, the tank agitation device comprising the valve accommodating portion 51, the lower portion, the upper oil chambers 52, 54, etc. is adopted, but is not limited to this, and is attached to the submersible pump device 2. Any device can be adopted as long as the jet in the water tank is discharged for a certain period of time when the submersible pump is started to stir the water tank.

  Moreover, in the said embodiment, although the ejector mechanism 34 is comprised by providing the main body pipe | tube 34b which has the air introduction part 34c, it is not restricted to this. That is, the air hose 34d may be introduced into the discharge part 33 through the main body pipe 34b or the like, and the open end of the air hose 34d may be positioned near the discharge port 35a of the nozzle 35. Even with such a configuration, air can be sucked from the air hose 34d by the ejector effect of the jet flowing through the discharge section 33, and air can be mixed into the jet.

  Furthermore, in the said embodiment, although the ejector mechanism 34 is provided in the discharge part 33 of the tank stirring apparatus 4, and the air is mixed in the jet flowing through the discharge part 33, it is not restricted to this. For example, an electric blower is used as an aeration unit, and this electric blower is driven simultaneously with the activation of the submersible pump device 2 to forcibly supply air to the agitation device 4 in the tank. It may be stopped (substantially equivalent to the stirring time of the stirring device). As described above, any configuration that allows air to be mixed into the jet flowing through the discharge unit 33 may be used, but the use of the ejector mechanism 34 is advantageous in terms of downsizing of the apparatus and running cost.

  Furthermore, in the above embodiment, the water level sensor using the floats 7 to 9 is used for the operation of the submersible pump device 2, but in the water tank using the tank stirring device 4, the float is swung by the water flow. In order to avoid false detection, it is more desirable to use a pressure type sensor such as a bubble type.

1 is an overall configuration diagram showing an embodiment of the present invention. It is the side view which abbreviate | omitted partially which shows the installation state in the water tank of the submersible pump apparatus of the embodiment. It is a top view of the submersible pump device. It is sectional drawing which shows the stirring apparatus in the same tank.

Explanation of symbols

1 Pump tank (water tank)
2 Submersible pump device 32 Inflow part 33 Discharge part 34 Ejector mechanism (air mixing part)
4 Stirrer in pump tank

Claims (2)

A pump that is attached to a submersible pump device installed in a water tank and discharges a part or all of the jet of the submersible pump device into the water tank for a certain time at the start of operation of the submersible pump device, thereby stirring the water tank. A tank agitator,
An air mixing part for mixing air into the jet flow introduced into the pump tank agitator;
An agitation device in a pump tank, wherein a jet mixed with air by the aeration unit is discharged into the water tank. In the pump tank agitator according to claim 1,
An inflow portion into which a jet flows from the submersible pump device;
A discharge part having a discharge port for discharging the jet flow flowing into the inflow part into the water tank,
The agitation device in a pump tank, wherein the aeration unit is an ejector mechanism that is provided near the discharge port and sucks air into the jet by an ejector effect of the jet flowing through the discharge.

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