CN85202299U

CN85202299U - High efficiency self-sucking pump without bottom valve

Info

Publication number: CN85202299U
Application number: CN 85202299
Authority: CN
Inventors: 杜同
Original assignee: SICHUAN POLYTECHINCAL COLLEGE
Current assignee: SICHUAN POLYTECHINCAL COLLEGE
Priority date: 1985-06-11
Filing date: 1985-06-11
Publication date: 1986-08-06

Abstract

The utility model relates to the method and the structure that the hydraulic model of the modern centrifugal pump is utilized to reform into a high efficiency self-sucking pump without a bottom valve. A fixed cut water in the pump body pump body is changed to a rotatable movable cut water, and a pumping hole ring is changed to a miter cut ring. The direction of the pump body is provided with an air-water separation chamber. The utility model has the advantages of short time of the self suction, convenient starting, and simple operation. Besides, the hydraulic efficiency of the utility model is higher 5-10% than hydraulic efficiency of the ordinary self-sucking pump, and the utility model can replace the ordinary self-sucking pump and the ordinary centrifugal pump.

Description

High efficiency without bottom valve self-priming pump

The utility model is a kind of without bottom valve self-priming pump.Be characterized in a kind of high efficiency without bottom valve self-priming pump.

Therefore the without bottom valve self-priming pump of Shi Yonging, has reduced the investment of pumping plant owing to cancelled bottom valve in the centrifugal pump station pipeline, go out equipment such as Water gate valve, safety check socially.Also reduce line loss, improved pipeline efficient; It is convenient also to have starting.Advantages such as water diversion is less.But because self-priming starting and structural needs mostly are reclinate again hyperbolic bend pipes after adopting intake pipe to be bent upwards, and between volute outlet and exit of pump, a big air-water separation chamber is set.In order to shorten self-priming time, again the volute section is expanded.Because this three aspect, caused the reduction significantly of the efficient of without bottom valve self-priming pump own, repack same water pump into the without bottom valve self-priming pump after.Generally than raw water pump efficient low 5～10%.Therefore, make applying of without bottom valve self-priming pump be subjected to certain limitation, only in the water pump of small-sized or extraordinary needs, use usually.

The utility model is under the prerequisite that does not change centrifugal pump runner physical dimension, and taking to change in the pump housing fixedly, cut water is movable cut water; Changing the ring-like choma in garden is miter cut ring; Without the hyperbolic bend pipe still is straight intake pipe.Make the efficient of this without bottom valve self-priming pump keep the efficient of former centrifugal pump.Promptly than the efficient high approximately 5～10% of general self-priming pump.

The utility model structure such as accompanying drawing are to change Ordinary Centrifugal Pumps pump housing cut water into rotating movable cut water (1).A steam-water separation chamber (5) is installed on pump housing top, the float (6) that has irrigating gate (2) on the top of steam-water separation chamber and open automatically or close, the choma of impeller inlet water shutoff changes miter cut ring 3 into.Start-up sequence and working principle are: 1. movable cut water is forwarded to starting position (shown in the accompanying drawing).2. with the water pump starting under no load.3. add an amount of diversion from irrigating gate.At this moment, because the centrifugal action of impeller 4 rotations, diversion forms water ring in the impeller periphery.This water ring is separated into two spaces with pump water inlet and outlet pipe.The water ring internal surface is because the impact of impeller blade, and the air in the intake pipe is mixed with water generation air water in the water ring.Because the gap delta at impeller and movable cut water tip is minimum, is generally 0.1 to 0.5mm.Therefore mix the back air water and can only enter air-water separation chamber along the cut water appearance to the diffluence of water outlet direction.In air-water separation chamber, because space enlargement, water velocity reduces, and bubble is emersion upwards then, discharges from air outlet (being irrigating gate).Remaining water flows to (or being inhaled into) volute small end via another wing plate of movable cut water, participates in air water once more and mixes.Circulation is referred to as the outer circulation principle in the modern times in absorbing method so repeatedly.Inevitable in addition some current can be by the choma intake pipe that bleeds.Modern without bottom valve self-priming pump is missed in order to prevent these part current, in order to avoid can not the self-priming starting.All adopt hyperbolic bend pipe upwards.This has just increased the hydraulic loss of pump.Based on overcoming this shortcoming.The utility model has adopted the device of miter cut ring, fugitive water can be injected automatically participate in the impeller circulation, its choma to leak circulation route among the figure shown in 7, and this circulation also can produce the air water mixed function.This is called interior circulation theory in modern water pump self-suction theory.Therefore this self-priming pump has outer circulation and the dual working principle of interior circulation.

After the air that intake pipe held was all taken away, pump water inlet and water pump vane just be full of water.Water pump has promptly reached the purpose of self-priming starting.After treating the water pump proper functioning, air-water separation chamber promptly has been full of water, and float 6 will be gone up floating plug automatically and close irrigating gate.Because pressure difference, at this moment movable cut water will clockwise rotate the passage of closing the volute small end automatically.At this moment the whole runner of water pump recovered to change a social system last as whole runners of centrifugal pump, so be the Ordinary Centrifugal Pumps running after the starting of this self-priming pump.So its efficient is inevitable consistent with Ordinary Centrifugal Pumps, this just escapes and has exempted from the lower shortcoming of modern without bottom valve self-priming pump efficient.

Experiment after deliberation, the high efficiency without bottom valve self-priming pump after the transformation of the way has the identical efficient of modern centrifugal pump, is higher than existing without bottom valve self-priming pump 5～10%, and its weight is also lighter, is easy on the structure realize.The self-priming starting time is not long, is generally 5 meters/2 minutes.Required water diversion is little during the self-priming starting, and 4 cun pumps only need about 1.5 kilograms of diversions.Because increase activity cut water in the pump housing, contrast Ordinary Centrifugal Pumps manufacture cost will have a bit to be increased.But owing to no longer need bottom valve, go out Water gate valve and safety check, so pumping plant is invested corresponding reduction.

Fig. 1 has represented the structure and the water circulation route of movable cut water, runner, air-water separation chamber, irrigating gate etc.

Fig. 2 has represented the circulation route that the mounting point of miter cut ring and impeller end face and gap and choma leak.Its top view of a rotating movable cut water (1) is arranged is rectangle from scheming visible the utility model.Its front view as shown in fig. 1.Water pump water outlet diffusing tube 8 and air-water separation chamber have rectangular channel between (5), and the vertical wing plate of movable cut water is set in wherein.On the tail end of the pump housing (volute) all and rectangular channel also arranged between air-water separation chamber.(horizontal is set in therebetween another wing plate of movable cut water.In the running operating mode.The vertical wing plate of movable cut water blocks the passage of water outlet diffusing tube, keeps current smoothly to flow out; The horizontal wing plate of movable cut water also blocks the passage of pump housing tail end, keeps current smooth flow in the pump housing.From waterpower runner angle.This moment is in full accord with the runner of general centrifugal pump.

Choma of the present utility model is miter cut ring (3), this is consistent for its gap and general centrifugal pump garden annular port cyclic group, be that can regulate continues to use after the running wearing and tearing, renew choma again but have to scrap after the annular choma wearing and tearing of general garden.

It is for the ease of manufacturing that the utility model is made two with air-water separation chamber and the pump housing; If, also they can be made one with special pearl processing method.

Claims

1, a kind of without bottom valve self-priming pump is provided with a centrifugal pump, air-water separation chamber, irrigating gate, it is characterized in that:

A, centrifugal pump body cut water are rotating movable cut water (1).

The choma of B, impeller inlet water shutoff is miter cut ring (3).

2, by the described self-priming pump of claim 1, it is characterized in that: air-water separation chamber (5) is arranged on pump housing top.

3, by claim 1,2 described self-priming pumps.It is characterized in that: irrigating gate (2) is arranged on the air-water separation chamber top.And in irrigating gate (2), laid the float (6) that to open and to close irrigating gate automatically.

4, by claim 1,2 described self-priming pumps, it is characterized in that: the gap of miter cut ring (3) end face and impeller end face is identical with the gap width of former centrifugal pump.

5, it is characterized in that by the described self-priming pump of claim 3: the gap of miter cut ring (3) end face and impeller end face is identical with the gap width of former centrifugal pump.

6, it is characterized in that by claim 1,2,5 described self-priming pumps: when self-priming started, movable cut water and impeller outer garden gap delta value were transferred to 0.1mm to 0.5mm for best.