CN2179922Y

CN2179922Y - External returning device for cantilever fluid pump

Info

Publication number: CN2179922Y
Application number: CN 94208341
Authority: CN
Inventors: 曲振征
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-05-20
Filing date: 1994-05-20
Publication date: 1994-10-19
Anticipated expiration: 2004-05-20

Abstract

The utility model relates to an external returning device for cantilever submergible pumps. A returning pipe communicated with a pump body is used to discharge liquid leaking into the pump body. The external returning device is characterized in that the outlet end of the returning pipe is connected with the liquid inlet pipe of a pump, and the returning pipe, the pump body and the liquid inlet pipe of the pump form a sealed structure. Compared with existing plug-in type cantilever submergible pumps, the utility model has the advantages that maintenance is convenient, common bolts and bolt nuts can be adopted, the pump body is only corroded on a single side, etc. Compared with existing external storing groove type cantilever submergible pumps, the utility model has the advantages that the returning pipe is not easy to block, a liquid storing tank doesn't need to be provided with connecting holes, the back flow of the returning pipe is free from the limit of the liquid levels of storing grooves, etc.

Description

External returning device for cantilever fluid pump

The utility model relates to blowback stream device under a kind of external mounted cantilever liquid, is discharged the vent flow that enters in the pump housing by the reflow pipe that is communicated with the pump housing.

Existing cantilever Under Water Pumps mounting type is divided into card edge type and two kinds of structures of external mounted.Plug-in type cantilever Under Water Pumps exists following deficiency: 1. pump housing lower end is inserted in the corrosive liquids, and the pump housing is two-sided all to be corroded; 2. the bolt and nut at pump housing immersion liquid position need adopt special substance to make the cost height; 3. maintenance difficult will hang out liquid level with whole pump when needing repairing.

Because there is above-mentioned shortcoming in card edge type cantilever Under Water Pumps, people have designed a kind of external mounted cantilever Under Water Pumps again, and this pump is provided with reflow pipe and links up mutually with hopper, and its deficiency is: 1. reflow pipe stops up easily, not easy to clean; 2. need offer the reflow pipe attachment hole at hopper; The reflow pipe position need exceed the hopper liquid level, satisfies this condition and has certain difficulty sometimes, when liquid level exceeds reflow pipe, forms reflow pipe easily and pours in down a chimney.

The purpose of this utility model is to provide blowback stream device under a kind of novel external mounted cantilever liquid, to overcome existing existing the problems referred to above of external mounted cantilever Under Water Pumps.

The purpose of this utility model is finished like this.Blowback stream device under a kind of external mounted cantilever liquid, discharge the vent flow that enters in the intervalve by the reflow pipe that is communicated with intervalve, the outlet end that is characterized in said reflow pipe is connected with the liquid inlet pipe of pump housing front end, and reflow pipe and intervalve, the pump housing and liquid inlet pipe constitute enclosed construction.Above-mentioned reflux is not just limited by the hopper liquid level, and is difficult for stopping up, and is particularly suitable for carrying the medium that contains the easy deposition of a large amount of solid particles.

In the blowback stream device, intervalve exceeds reflow pipe inlet duct appropriate location and offers spill pipe under the above-mentioned cantilever liquid, to prevent above the too high base plate that enters pump of hopper liquid level.

The utility model has the following advantages compared with the prior art:

1. the pump housing is corroded by single face only, can adopt the plain bolt nut as coupling, and is easy to maintenance;

Since the reflow pipe horizontal run apart from weak point; Pump intake end suction force, so reflow pipe in addition is difficult for stopping up;

3. need perforate on hopper, and the mounting point of reflow pipe is not just limited by the hopper liquid level also.

Fig. 1 is the utility model overall structure schematic representation.

Among the figure: 1 intervalve, 2 reflow pipes, 3 spill pipes, 4 drain pipes, 5 liquid inlet pipes, 6 control valves, 7 hoppers, 8 base plates, 9 pump housings

Introduce the utility model detailed structure below in conjunction with accompanying drawing.

As can be seen from Figure, the reflow pipe 2 of blowback stream device adopts a vertical bend pipe under this external mounted cantilever liquid, one end of this reflow pipe is connected with intervalve 1, the other end is connected with the liquid inlet pipe 5 of pump, be provided with control valve 6 between liquid inlet pipe 5 and the hopper 7, liquid inlet pipe 5 extracts liquid and is discharged by drain pipe 4 through the pump housing 9.The vent flow that enters in the intervalve 1 enters in the liquid inlet pipe 5 with reflow pipe 2.Intervalve 1 exceeds reflow pipe 2 appropriate locations and is provided with spill pipe 3, enters above the base plate of pump to prevent liquid medium.

Claims

1, blowback stream device under a kind of external mounted cantilever liquid, enter the interior vent flow of intervalve [1] by reflow pipe [2] discharging that is communicated with intervalve [1], the outlet end that it is characterized in that said reflow pipe [2] is connected with the liquid inlet pipe [5] of pump housing front end, and reflow pipe [2] constitutes enclosed construction with intervalve [1] and liquid inlet pipe [5].

2, reflux according to claim 1 is characterized in that said intervalve ［ 1 ］ exceeds reflow pipe ［ 2 ］ entry end appropriate location and is provided with spill pipe ［ 3 ］.