JPS63189694A - Starting method for vertical shaft pump - Google Patents

Abstract

PURPOSE:To cut cost by revolving a vane wheel, pouring water into a pump casing, and by pumping up water by aspirating the air in a suction pipe outside the pump casing. CONSTITUTION:A vertical shaft pump 1 is started by revolving a vane wheel 14 and at the same time by pouring water into a pump casing 11 through a water feeding pipe 3 by a submersible pump 4. The introduced water inhales a portion of the air in a suction pipe 2 by the revolution-drive of the vane wheel 14 and mixes said air as air bubbles and discharges the mixture outside the pump casing 11. Then, the inside of the suction pipe 2 is decompressed, and water feeding action is generated. Therefore, the need of using the parts such as vacuum pump and water filling detector is avoided, and cost cut can be realized.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is mainly used in a pump suction well of a drainage pump station installed for draining waterways or in a rainwater pump facility, and the impeller is lower than the water suction surface. The present invention also relates to a method for starting a vertical shaft pump installed above.

[Conventional technology]

In a vertical shaft pump with an impeller installed above the water suction surface as described above, a vacuum pump is generally used to suck water from the suction cylinder, and a full water detector detects when the inside of the pump casing housing the impeller is full of water. The starting method was to then rotate the impeller.

[Problem that the invention seeks to solve]

However, the conventional start-up method described above requires a vacuum pump and a full-water detector, which are extremely expensive, and are difficult to use when the quality of the water being sucked is poor, that is, it is highly corrosive, or there are foreign substances. If it is mixed in, special consideration must be given to its own structure or the structure around it, which requires a more complicated structure and increases costs. In addition, the startup method was complicated, as it was necessary to control the vacuum pump based on the detection results of the full water detector.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a simple and economical method for starting a vertical shaft pump.

[Means for solving problems]

In order to achieve the above object, the method for starting a chamber shaft pump according to the present invention rotates the impeller while injecting water into the pump casing housing the impeller, and as the impeller rotates, the air in the suction pipe is pumped. It is characterized by sucking water out of the casing.

(Function) The method of starting the chamber shaft pump according to the present invention is such that the impeller inside the pump casing is rotated while water is injected into the pump casing. The injected water draws in some of the air in the suction pipe, and this part of the air is mixed as bubbles and discharged out of the pump casing. Therefore, the air in the suction pipe becomes gradually diluted, the pressure inside the suction pipe is reduced, and water is drawn from the suction pipe into the pump casing.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram for carrying out the method of the present invention,
is a chamber shaft pump, 2 is a suction pipe, and 3 is a water supply pipe.

The chamber shaft pump 1 is used for sewage drainage, sewage drainage, rainwater drainage, or farmland irrigation, and a flange portion 12 integrally formed with the pump casing 11 is connected to a floor hole into which a suction cover 13 is inserted. By fixing it to the peripheral edge of B, it is attached to the floor insert. A suction pipe 2 extending downward is connected to the suction cover 13,
The suction port 21 of this suction pipe 2 is submerged in the water absorption surface WL. Therefore, the chamber shaft pump 1 is installed such that the impeller 14 is always located above the suction surface WL.

One end of the water supply pipe 3 is connected to the side of the pump casing 11 of the chamber shaft pump 1, and the water sucked up by the submersible pump 4 installed below the water suction surface WL is transferred to the impeller inside the pump casing 11. It can be injected from above 14.

With the above configuration, starting of the chamber shaft pump 1 is as follows.
This is done by simultaneously rotating the impeller 14 and injecting water into the pump casing 11 from the submersible pump 4 through the water supply pipe 3. When the impeller I4 is rotated while injecting water into the pump casing 11 in this manner, the injected water accumulates on the impeller 14, and as a result, a suction action occurs as the impeller 14 is driven to rotate. That is, the injected water draws in a part of the air in the suction pipe 2 by rotation of the impeller 14, mixes this part of the air as bubbles, and discharges the mixture to the outside of the pump casing 11. As the air is sequentially discharged outside the pump casing 11 in this manner, the air within the suction pipe 2 becomes diluted, and the pressure within the suction pipe 2 is reduced. By reducing the pressure inside the suction pipe 2 in this way, a so-called priming operation progresses, and eventually water is sucked into the pump casing 11 and the inside of the pump casing 11 is filled with water, causing a water supply effect. will be carried out. A valve 5 is provided in the water supply pipe 3 and is kept closed when the main pump is supplying water.

The conditions under which startup is possible using the startup method described above vary depending on the diameter of the suction pipe 2, etc., but according to the results of experiments conducted by the inventor of the present application, when the diameter of the suction pipe is 1150 mm, the impeller 14
Distance from to water absorption surface WL 1.5 m 1 rotation speed 268 r,
It was confirmed that water could be pumped under the conditions of p and m.

It should be noted that the structure of the structure for carrying out the method of the present invention is of course not limited to the above-mentioned embodiment. For example, water to be injected into the pump casing may be prepared by preparing another water source such as a tank, and then connecting the pipes from this other water source. The water may be fed from a water supply pipe.

〔Effect of the invention〕

As is clear from the above description, according to the method for starting a chamber shaft pump according to the present invention, starting can be performed simply by injecting water into the pump casing and rotating the impeller. There is no need to use expensive parts such as a vacuum pump or a full water detector, and costs can be reduced.

Therefore, even if the quality of the water to be sucked is poor, there is no need to take special consideration to protect the vacuum pump and the full water detector, and the structure can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an example of a configuration for implementing the method of the present invention. 1... Chamber shaft pump 2... Suction pipe 11... Pump casing 14... Impeller patent applicant Kubota Iron Works Co., Ltd. Agent
Patent attorney Takashi Suzue - Figure 1

Claims (1)

[Claims] (1) In a method of starting a vertical shaft pump in which the impeller is installed above the water suction surface, the impeller is rotated while injecting water into the pump casing that houses the impeller, and as the impeller rotates, the air in the suction pipe is A method for starting a vertical shaft pump characterized by sucking up water by suctioning it outside the pump casing.