JP3603167B2 - Water tank equipment to remove or wash sand with stored water - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a drainage pit for various solid-liquid mixed liquids, sewage, muddy water, rainwater, miscellaneous drainage, and the like, and a drainage device for a water tank in which various solids are mixed, such as a relay pump facility in a sewer.
[0002]
[Prior art]
In pump tank facilities such as drain pits where solids such as sand are mixed, the mixed solids gradually settle and accumulate, making it difficult for the pump to absorb water and eventually obstructing the suction port. A pump with blades is used, injection and agitation with pressure water is performed, agitation is performed using the inflow of water flowing into the water tank, or dewatering of the water tank is periodically performed.
[0003]
[Problems to be solved by the invention]
For example, in a pump equipped with a stirring blade provided with a drive shaft of a submersible pump protruding below the suction port and provided with stirring blades, if the cloth is cut off or vinyl is mixed in, the winding will occur and the operation will be hindered. Vibration is likely to occur due to the impact of solid matter on the body and wear, and the pump life is generally short.
Although the method of injecting and agitating the pressurized water is easy to cope with all, the pressure water source to be used and the operation cost are problems.
In addition, in the method of stirring using the inflow water force, for example, in the applicant's patent No. 1395429 and utility model No. 1760342, it is very effective when there is always a certain amount of inflow water, but when the amount of inflow water is small, sufficient stirring power is used. In addition, the "pump equipment that removes sand by the difference in water level of the divided tanks" filed on September 7, 1994 has the following problems: is there.
[0004]
[Means for Solving the Problems]
In the present invention, in order to solve these problems, a storage water tank is provided in or near the water tank, and an exhaust pipe provided with an exhaust valve for discharging air in the tank is provided above the storage water tank. A downwardly extending intake pipe is provided for inhaling external air into the storage tank when it drops, and a discharge port connected to the injection nozzle is opened at the bottom of the storage tank.
The pump hole part of the water tank where the pump is installed is formed so that the corner between the bottom surface and the surrounding wall surface is formed as an inclined surface or an arc shape so that the water flow smoothly, and the direction of the stirring nozzle is approximately constant To be oriented.
[0005]
In addition, the inflow water into the water tank is made to flow by using a channel gutter, a splash prevention plate, or the like so as to promote agitation circulation.
[0006]
For the purpose of cleaning the bottom of the water tank, a mortar-shaped or a polygonal pump hole having an inverted trapezoidal cross section is provided in the water tank, a conical pedestal is provided near the center of the pump hole, and the pump is placed on the pedestal. Alternatively, nozzles for spraying the storage tank water are arranged around the outer periphery of the bottom of the water tank which is installed above the pedestal and is inclined so as to flow down into the pump hole.
The inflow water into the water tank is introduced such that a waterway gutter or a waterway groove is formed in the bottom of the water tank, and the inflowing water collides with the conical pedestal of the pump hole and the opposing peripheral wall surface, and reversely rises or reversely circulates.
[0007]
[Yen]
When the water tank equipment of the pump configured as described above is started at a high water level and the automatic operation of stopping the low water level is performed, the water tank water level rises due to the inflow of water into the water tank from the low water level at which the pump stopped draining and stopped. As a result, the water level in the storage tank also rises while pushing and exhausting the exhaust valve with the tank water flowing backward from the injection nozzle, and stores the water level close to the maximum water level of the water tank.
In the case of a water tank in which the water tank rises at a very high speed, an inlet provided with an inflow valve can be opened at the bottom of the storage tank to increase the storage speed.
[0008]
If the water tank water level reaches the upper limit water level and the pump starts up and starts pumping, the water level in the water tank falls, and if the water level reaches the intake pipe opening of the storage water tank and the outside air is sucked in, the water in the storage tank becomes the water tank level. Due to the pressure difference between the water level in the reservoir and the water level in the reservoir, the water is ejected from the injection nozzle located in the reservoir and the water in the pump hole, where the amount of stored water is reduced, is strongly agitated and circulated, and the solids that have accumulated on the bottom of the pump hole The material and suspended matter floating on the surface of the water are entrained and mixed, and discharged out of the water tank together with pumping.
[0009]
When the bottom of the water tank is washed, the water level of the water tank falls due to the pumping of the pump, and the water in the storage tank is ejected from the injection nozzles arranged around the bottom, and the washing water flowing down the bottom of the water tank flows into the pump hole. The liquid flows down into the conical pedestal, and rises and is sucked by the pump while mixing.
The water flowing into the water tank will also flow down the open channel with the fall of the tank water level, and the sediment in the channel will flow down to the pump hole while mixing and flowing down. To separate and remove precipitated solids or suspended matter synergistically with the inflow of reservoir water.
[0010]
In addition, in equipment that handles mixed solids at a high concentration, continuous operation at an extremely low water level using only inflow water into the water tank is the best method that can prevent sedimentation and accumulation due to stagnation. Continuous operation at an extremely low water level tends to cause air lock phenomenon (a phenomenon in which an air layer is formed at the suction port of the impeller and the pump cannot be pumped) due to the suction of air. A part of the inflowing water collides and rises, and is injected into the pump suction port, and the air lock phenomenon is destroyed and prevented due to the stirring.
[0011]
Embodiment 1
Hereinafter, the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view, and FIG. 2 is an internal plan view. In the first embodiment, a storage water tank C is provided above a pump hole A in a water tank 1, and an upper side of the storage water tank C is provided. An intake pipe 5 connected and connected by a connection pipe 4 shown in FIG. 3 extends downward and is opened, and is connected and opened to an exhaust pipe 8 via an exhaust valve provided with a ball 6 above.
The bottom surface 2 of the pump hole A in which the pumps 16 and 16 'are installed is formed so that the periphery thereof is smoothly formed by an inclined surface 11 and a circular arc, so that the stirring flow inside the pump hole A can be performed smoothly.
[0012]
The pumped water of the pumps 16 and 16 ′ is discharged to the outside of the upper part of the water tank 1 by the discharge pipe 12, and the inflow water into the water tank 1 flows down the upper plate 14 of the storage water tank C manufactured by being inclined from the inlet 13. It is guided by the scattering prevention plate 15 and falls into the injection nozzle 10 side of the pump hole A.
In addition, three outlets 9 are opened at the bottom of the storage water tank C, and are respectively connected to the injection nozzles 10.
[0013]
Embodiment 2
In the second embodiment, a sectional view of which is shown in FIG. 4 and a plan view of which is shown in FIG. 5, a pump hole A is formed in a mortar shape on the inner bottom surface of the water tank 21, and a conical pedestal 25 is formed substantially at the center thereof to form a pump 26. Is installed.
In order to minimize scattering of solid matter mixed into the inflow water from the inflow ports 27 and 27 ', a downflow waterway D is provided on the bottom of the water tank immediately below the inflow ports 27 and 27', and a waterway E which is connected to the waterway E and is introduced into the pump hole A. Is established.
The water channel E may be introduced toward the center of the pump hole A, but it is more effective to make the water flow somewhat eccentric as in this embodiment because it flows around somewhat.
[0014]
Further, a closed storage water tank C having the same function as that of the first embodiment is formed and installed in the water tank 21 by the partition wall 23 and the sealing lid 22, and the outer periphery of the bottom 24 of the water tank around the pump hole A is provided. The spray nozzles 30 connected to the storage water tank C are arranged, and the water tank bottom surface 24 is spray-cleaned.
[0015]
【The invention's effect】
As described above, in the present invention, it is possible to store relatively clean water tank water having a water level close to the highest water level that has flowed backward from the injection nozzle into the storage water tank installed in the water tank. When the water level and the pump hole water level or the water level difference between the injection nozzles is 0.5 m, the initial jet velocity is 2.91 m / s, and when the water level difference is 1.0 m, the initial jet velocity is about 4.12 m / s. Without using another power source at all, and at the most effective time when the water volume in the pump hole is reduced, it can be spouted out, and the solids that precipitate and deposit on the bottom of the water tank can be circulated and agitated to eliminate them. By carrying out vertical stirring or horizontal reversal stirring, suspended matters floating on the surface of the water tank can be effectively taken in and discharged from the circulating water, so that there is also an effect of preventing generation of offensive odor in sewerage facilities and the like.
[0016]
In the first embodiment, the concept of Applicant's Utility Model No. 1760342 was adopted to perform the stirring and circulating flow utilizing the inflow water force. Therefore, even when the amount of inflow water into the water tank was large, the amount of inflow water was small. Stable sand removal and mud removal can be performed even during extremely small automatic operation.
Also, in the first embodiment, when the continuous operation at an extremely low water level is performed, a portion near the lower part of the pump suction port is so arranged that a part of the guided inflow water is injected into the pump suction port. By providing a plate-shaped or chevron-shaped projection on the surface, air lock can be eliminated as in the second embodiment.
[0017]
In the second embodiment, since the equipment adopts the idea of the applicant's patent No. 1395429 and utility model No. 1760342, not only each function is exhibited, but also the extremely low water level continuous operation particularly based only on the inflow water. The effect of releasing the air lock phenomenon when performing the operation and achieving stable operation is great.
In addition, even during automatic operation of high water level start and low water level stop, mixed water solids can be prevented from being scattered throughout the water tank due to the water channel groove provided from the lower part of the inlet to the pump hole. As a result, it is possible to effectively eliminate the water by stirring down the inflow water into the water tank.
[Brief description of the drawings]
FIG. 1 is a sectional view of a first embodiment.
FIG. 2 is an internal plan view of the first embodiment.
FIG. 3 is a cross-sectional view of an intake pipe and an exhaust valve portion of a storage water tank.
FIG. 4 is a sectional view of a second embodiment.
FIG. 5 is a plan view of a second embodiment.
FIG. 6 is a cross-sectional view of a reservoir water inlet.
[Explanation of symbols]
1, 21 Water tank 3, Reservoir shell 10, Injection nozzle 12, Water pipe 13, 27, 27 'Inlet 15, Splash prevention plate 16, 16', 26 Pump 23 Partition wall 25, Conical pedestal A, Pump hole B, Water tank C, storage water tanks a, b, c These are start, stop, and alarm float switches.
Arrows in the figure indicate flows of gas and liquid.

Claims (3)

A closed storage water tank is installed at a position one step higher than the bottom of the pump hole of the water tank in which the pump is installed, and an air suction pipe extending downward to open at the top of the storage water tank and an exhaust valve are provided and open to the outside. Equipped with an exhaust pipe, and further provided with a discharge pipe connected to the injection nozzle at the bottom of the storage tank, and when the water level of the water tank rises, the tank water is back-flow-stored from the injection nozzle, and the pump operates to lower the water level of the water tank. A water tank facility for a pump that draws in air from an opening of an air suction pipe and jets water in a storage water tank from an injection nozzle to perform agitating the pump hole, or to wash and remove mud in the water tank. A corner between the pump hole bottom surface and the peripheral wall surface is formed as an inclined surface or an arc surface, and at least one or more injection nozzles are arranged on one side of the pump hole. 2. A water tank facility for a pump according to claim 1, wherein a scattering prevention plate, a water channel groove, and the like are provided so as to flow in such a manner as to promote agitation and circulation by the injection nozzle. A mortar-shaped pump hole is provided in the water tank, and a conical pedestal is provided substantially at the center of the pump hole. The base of each inclined surface is smoothly formed in an arc shape. An open channel that flows into the pump hole from the inlet or the lower part of the inflow port is opened, and the inflowing water flows into the conical pedestal in the center of the pump hole and the opposite peripheral wall surface of the pump hole so as to flow upward and reverse. 2. The water tank equipment for a pump according to claim 1, wherein the water of the storage tank whose bottom has been washed flows down into the pump hole to be inverted and agitated.

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