JPH09290894A - Easily cleanable tank and method for cleaning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tank construction which is efficiently cleanable and the method for cleaning. SOLUTION: An exhaust pipe 6 made of a shell of an appropriate length connected to an aspirator is inserted into a tank 1 through an insertion opening for the exhaust pipe 6. The bottom end of the exhaust pipe 6 is inserted and held by an insertion part provided in a perforated pipe 2. By negative pressure, generated by the operation of the aspirator, within the perforated pipe 2 and the exhaust pipe 6 inserted and held, the object of discharge is sucked from a suction hole 3 provided in the face of the perforated pipe 2 to be discharged outside through the exhaust pipe 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a method for easily cleaning the inside of an underground buried tank and a tank structure suitable for this cleaning.

[0002]

2. Description of the Related Art Conventionally, as a method for cleaning the inside of a tank, a method of inserting a pipe from the top of the tank and applying it to the bottom of the tank body to remove water and sludge by suction is generally used. I can't find a way to use a perforated tube.

[0003]

Conventionally, in a gas station or the like, an underground tank is buried to store kerosene, gasoline, etc., and a necessary amount is taken out from the tank and used. This oil contains a small amount of water and sludge (mud-like sediment), which accumulates at the bottom of the tank due to the difference in specific gravity during storage. Therefore, the inside of the tank must be regularly cleaned to remove this water and sludge. The conventional cleaning method is to insert the pipe into the tank to suck out sludge and the like as described above, but the sludge does not have the fluidity of water and the inserted suction pipe. It is possible to suck and discharge near the mouth, but it is difficult to discharge sludge accumulated at a place apart from the suction pipe mouth such as near the end of the tank. Further, if the bottom surface of the tank is not horizontal, water and sludge cannot be completely discharged. The present invention has been invented to solve the problems relating to the conventional means for cleaning the inside of a tank as described above, and is used for an efficient cleaning method using a perforated pipe and this cleaning method. It is intended to provide a tank structure.

[0004]

As means for solving the problems, the present invention uses a perforated pipe provided at the bottom of the tank to suck and discharge sludge and the like. That is, according to one aspect of the present invention, a perforated pipe having a length close to the entire length of the tank is provided at the bottom of the tank main body, a holding portion for inserting and holding a discharge pipe is provided at an appropriate position above the perforated pipe, and the upper portion of the holding portion is provided. An easy-to-clean tank characterized in that a discharge pipe insertion port is provided on the wall surface of the tank located at, and another aspect of the present invention is to provide a discharge pipe with a pipe body of an appropriate length connected to a suction device. , The discharge pipe is inserted into the tank, the lower end of the discharge pipe is inserted and held in the insertion part provided in the perforated pipe, and the suction device is actuated to generate negative pressure in the inserted and held discharge pipe and the perforated pipe. A method for cleaning a tank is characterized in that an object to be discharged is sucked through a suction hole provided in the surface and discharged outside through a discharge pipe.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION To use the present invention, first, a discharge pipe made of a tubular body having an appropriate length is inserted into a tank through an upper guide pipe serving as a discharge pipe insertion port, and then inserted into a lower guide pipe serving as a holding portion. Insert and hold the lower end. Next, the upper end of the discharge pipe is connected to the suction device, and the suction device is operated.
Then, the inside of the discharge pipe and the perforated pipe has a negative pressure, and water / sludge is sucked through the suction holes provided in the perforated pipe, rises in the discharge pipe and is discharged to the outside. After the discharge work is completed, the discharge pipe may be pulled out in the reverse order of the above. A vent pipe is permanently installed in the tank, and the outside air flows into the tank through the vent pipe and flows out through the perforated pipe and the exhaust pipe, so that the atmospheric pressure in the tank is kept constant.

[0006]

Embodiments of the present invention will be described below. In the figure, reference numeral 1 denotes a tank body having a hollow cylindrical shape, which is buried underground. Reference numeral 2 denotes a perforated pipe, which is an elongated cylindrical body having both ends closed, and has a length close to the entire length of the tank, and its bottom face is fixed to the center of the bottom of the tank body.
A plurality of suction holes 3 are arranged in parallel on both sides in the vicinity of the bottom of the perforated pipe with a constant interval. Reference numeral 4 denotes a lower guide tube, which has an inverted conical shape and is fixed to the upper center of the perforated tube. A through hole is provided in this fixing portion, and a female screw is engraved on the inner surface of the through hole. Reference numeral 5 denotes an upper guide pipe, which is a short pipe having substantially the same diameter as that of the upper portion of the lower guide pipe, and is penetrated and fixed to a hole provided in the central upper portion of the tank body. The upper guide tube is provided vertically above the lower guide tube. Reference numeral 6 denotes a discharge pipe, which is slightly smaller than the upper and lower guide pipes and is longer than the outer diameter of the tank main body. A male screw is engraved near the lower end thereof. In the tank-buried state, a hole 7 having an appropriate diameter is provided between the ground and the upper surface of the center of the tank, and an opening / closing lid 8 is provided on the upper surface of the hole. Reference numeral 9 is a capacity detecting portion provided at a proper place on the upper surface of the tank, and 10 is a ventilation pipe.

Although the main function of the present invention has been described above, in this embodiment, the upper guide tube is used for the discharge tube insertion port and the lower guide tube is used for the holding portion. This is to facilitate insertion and holding of the discharge pipe.The upper guide pipe is a short pipe with an inner diameter slightly larger than the outer diameter of the discharge pipe, and regulates the position range of the lower end of the discharge pipe inserted into the tank. Moreover, since the lower guide tube has a funnel shape, the end of the discharge tube can be easily set at a predetermined position of the perforated tube. A screw portion is engraved on the lower portion of the discharge pipe and the lower guide pipe, and both pipes can be brought into close contact with each other by screwing them together to maintain airtightness. As shown in the drawing, the hole 7 is provided above the upper guide tube.
Further, an opening / closing lid 8 is provided, and this lid is opened at the time of work, and the lid is normally closed. The perforated tube used in this example is
Suction holes are provided at regular intervals on both sides near the bottom (fixed part), and since this perforated pipe is located over almost the entire length of the tank, almost all of the sludge at the bottom of the tank can be sucked and discharged. . The suction holes may be provided at the same positions on both sides, but they may be arranged in a staggered manner. FIG.
Shows another embodiment of the present invention, in which the inner diameter of the suction hole is large near both ends of the porous tube and small near the discharge tube so that a uniform suction force can be obtained.
In addition, 9 is a capacity | capacitance detection part, and is for detecting the internal capacity by inserting a rod-shaped measuring scale. As described above, according to the present invention, a large number of suction holes are located in the vicinity of the bottom surface of the tank, and sludge and the like can be sucked and discharged from the suction holes, so that the inside of the tank can be cleaned more easily and efficiently.

[0008]

According to the present invention, sludge and the like can be sucked and discharged from a plurality of places by using a perforated pipe, and the deposit on the bottom of the tank can be efficiently treated. Also,
By appropriately selecting the suction hole size, it is possible to provide a useful method for cleaning the inside of the tank and a tank structure that enables uniform suction and discharge.

[Detailed Description of Drawings]

FIG. 1 is an explanatory view of the internal structure of a tank of the present invention.

FIG. 2 is a front view of a perforated tube according to another embodiment of the present invention.

FIG. 3 is an explanatory view of the insertion state of the discharge pipe of the present invention.

FIG. 4 is an enlarged explanatory view of an essential part showing the vicinity of a perforated pipe of the present invention.

[Explanation of symbols]

 1 Tank body 2 Perforated pipe 3 Suction hole 3a Small diameter suction hole 3b Large diameter suction hole 4 Lower guide pipe 5 Upper guide pipe 6 Discharge pipe 7 Hole part 8 Opening / closing lid 9 Capacity detection part 10 Vent pipe 11 Screw part

Claims (2)

[Claims] 1. A perforated pipe having a length close to the entire length of the tank is provided at the bottom of the tank main body, and a holding portion for inserting and holding a discharge pipe is provided at an appropriate position above the perforated pipe, and the holding portion is located above the holding portion. An easy-to-clean tank characterized by a discharge pipe insertion port provided on the wall surface of the tank. 2. The method for cleaning a tank using the tank structure according to claim 1, wherein a discharge pipe having a pipe body connected to a suction device and having an appropriate length is inserted into the tank through a discharge pipe insertion port,
Insert and hold the lower end of the discharge pipe in the insertion part provided in the perforated pipe,
When the suction device is operated, negative pressure generated in the inserted and held discharge pipe and the perforated pipe sucks an object to be discharged from a suction hole provided in the surface of the perforated pipe, and discharges it to the outside through the discharge pipe. How to clean the tank.