CN201255119Y - Internally-mixed jet self-priming pump - Google Patents

Abstract

The utility model provides an inner-mixing shooting flow self-priming pump. The utility model is characterized in that the inner-mixing shooting flow self-priming pump comprises a pump body, a pump bonnet, an impeller, a suction chamber, a shooting chamber, a water pressing chamber, an air-water isolation chamber, a water storage chamber, a reflux valve, an air evacuation valve, a water outlet valve, a water inlet, a water outlet and a transmission system. A vortex-type shooting flow chamber is designed below the suction chamber in a valve body; the shooting flow chamber communicates with the water storage chamber and the suction chamber in the pump body. The axial line of a nozzle and the axial line of the impeller are coaxial, and the nozzle and the impeller are integrated with the pump body. A reflux ball valve is arranged under the water return opening in the shooting flow chamber. The air evacuation valve is arranged above the air-water separation chamber of the valve body. Not only the self-priming duration is short and the self-priming performance is stable, but also the self-priming pump goes into the normal operation state automatically without needing manual operation after the self-priming course is completed.

Description

Internal-mixing jetted self-priming pump

Technical field

The utility model belongs to a kind of agricultural irrigation mobile operating water pump.

Background technique

Small-sized movable sprinkler irrigation unit often moves, and supporting water pump needs frequent start-stop.Ordinary Centrifugal Pumps need be installed bottom valve, will fill water in the suction sleeve and the pump housing before each the startup, does not obviously meet the supporting requirement of small-sized movable sprinkler irrigation unit, in order to alleviate labor intensity of operating personnel, avoid the bottom valve loss, increase work efficiency, need to use self-priming pump.

Domestic existing self-priming pump one is that performance parameter does not meet the supporting requirement of small-sized traveling sprinkler at present, the 2nd, there are shortcomings such as volume heaviness, self-priming time length, self-priming performance instability.

, comprise the agricultural irrigation mobile operating water pump of the U.S., European various countries abroad, all adopt diesel exhaust gas self-priming and hand pump self-priming dual mode.The major defect of these two kinds of self-priming modes, the one, need manual operation, labor intensity is big, and the 2nd, self-priming time is long, and self-priming performance is poor; The 3rd, the diesel exhaust gas self-priming is easy to make the outlet pipe carbon deposit, influences diesel engine and normally moves.

Summary of the invention

The purpose of this utility model provides a kind of internal-mixing jetted self-priming pump, and not only self-priming time is short for it, and self-priming performance is stable, and after finishing the self-priming process, changes normal operation automatically over to, does not need manual operation.

The technical solution of the utility model is: internal-mixing jetted self-priming pump is characterized in that: it comprises the pump housing, pump cover, impeller, suction chamber, jet chamber, pumping chamber, air-water separation chamber, water chamber, reflux valve, outlet valve, outlet valve, water intake, water outlet and transmission system;

In valve body below the suction chamber design vortex type jet chamber is arranged, the jet chamber communicates with pump housing inner storing water chamber and suction chamber, the axis of nozzle and the axis coaxle of impeller, and with pump housing cast solid; The backflow ball valve is positioned in water chamber under the backwater mouth of jet chamber;

Outlet valve is located at the air-water separation chamber top of valve body.

Aforesaid internal-mixing jetted self-priming pump is characterized in that: the nozzle cone angle is 8 °～10 °, and the jet expansion diameter is 10-20 millimeters.

Internal-mixing jetted self-priming pump of the present utility model is a reflux valve of having set up the liquid jetting device formula in the inlet of impeller.This reflux valve mainly is made up of backflow valve body, backflow valve ball, nozzle etc.Water pump starts fills with water in the forward direction pump housing first; can retain a part of water automatically during shutdown; treat to use when start next time; promptly enter the self-priming state behind the starting mode of pump; under the centrifugal action of impeller high speed rotating, the water that the impeller outlet place is mixed with gas enters pumping chamber with powerful kinetic energy, and the water that is mixed with gas separates at air-water separation chamber; gas is discharged from outlet valve, and water returns water chamber from pumping chamber.Simultaneously, the nozzle that part water in the water chamber flows into reflux valve at a high speed (is the zone of high pressure in the pumping chamber of pump chamber, pump suction chamber is a low pressure area), because the high-pressure spray that nozzle forms strengthens the degree of vacuum at impeller inlet place, the low-pressure water that is mixed with gas is inhaled into impeller inlet, two strands of current carry out gas separation under the centrifugal action of impeller high speed rotating behind mixing of impeller inlet place and exchange energy.The gas in the suction sleeve is discharged in circulation and so forth, and water is drunk up, and water pump is finished the self-priming process.At this moment, the reflux valve of liquid jetting device formula cuts out automatically, and liquid jetting device quits work, and water pump begins to change over to normal working.

Liquid jetting device is a kind of device that utilizes high-velocity fluid as operation power.Itself does not have moving element, thus have simple in structure, good seal performance, reliable operation and low cost and other advantages.

Description of drawings

Fig. 1 is the utility model embodiment's a structural representation.

Embodiment

The explanation of mark among Fig. 1: the 1-pump housing, 2-impeller, 3-impeller nut, 4-valve gap, the 5-sealing seat, 6-oil deflector, 7-felt collar, 8-deep groove ball bearing, the 9-impeller shaft, 10-bearing (ball) cover, 11-pulley key, 12-belt pulley, the 13-impeller key, 14-backflow valve ball, 15-bottom, the 16-reflux valve, 17-drain screw, 18-nozzle, the 19-pressure cap, 20-water intake, 21-water supply connector seat, 22-exhaust valve ball, 23-outlet valve, 24-water outlet, the 25-pressure cap, 26-outlet valve, 27-suction chamber, 28-jet chamber, 29-pumping chamber, 30-water chamber, 31-backwater mouth, 32-pollutant exhaust hole, 33-air-water separation chamber.

Below in conjunction with drawings and Examples the utility model is elaborated.

As can be seen from Figure 1, the utility model embodiment's internal-mixing jetted self-priming pump is characterized in that: it comprises the pump housing 1, pump cover 4, impeller 2, suction chamber 27, jet chamber 28, pumping chamber 29, air-water separation chamber 33, water chamber 30, reflux valve 16, outlet valve 23, outlet valve 26, water intake 20, water outlet 24 and transmission system;

In valve body 1 below the suction chamber 27 design vortex type jet chamber 28 is arranged, jet chamber 28 communicates with pump housing inner storing water chamber 30 1 and suction chamber 27, the axis coaxle of the axis of nozzle 10 and impeller 2, and with the pump housing 1 cast solid; Backflow ball valve 14 is positioned in water chamber 30 under 28 backwater mouths 31 of jet chamber; Outlet valve 23 is located at air-water separation chamber 33 tops of valve body 1.

The backwater mouth 31 of jet chamber 28 is downward, faces backflow ball valve 14 and pollutant exhaust hole 32, and pollutant exhaust hole 32 is foreign matters in the periodic cleaning pump housing 1, usually with cover plate 15 sealings, jet chamber 28 and the pump housing 1 cast solid.Outlet valve 26 and outlet valve 23 are located at the top of the pump housing 1.

Impeller 2 rotates, air in the intake pipe is sucked, and with 28 impellers 2 of water in pumping chamber 29 that suck mix from the jet chamber, mixed air-water mixture enters air-water separation chamber 33 from the pumping chamber 39 of the pump housing 1, air is light, overflowing from water is positioned at the top of air-water separation chamber 33, and air pressure backs down exhaust valve ball 22 when increasing and discharges from exhaust port.The water that has separated air sprays into suction chamber 27 from air-water separation chamber 33 through pumping chamber 29, water chamber 30, jet chamber 28 and nozzle 18 again to be mixed with the impeller 2 of inhaled air at pumping chamber 29 once more.Circulation drains the air in the intake pipe gradually so repeatedly, last normal water outlet.At the same time, because fluid-flow rate increases severely in the jet chamber 28, make the backflow ball valve 14 that is preset in the pollutant exhaust hole 32 be adsorbed and block jet chamber 28 backwater mouths 31, recirculation water is blocked, and has eliminated return loss, has improved self-priming pump efficient.

Impeller stops operating, jet chamber 28 runs out of steam, backflow ball valve 14 falls back in the pollutant exhaust hole 32 by own wt, force the pump housing 1 outlet valve 26 and outlet valve 23 to be closed automatically under the hydrostatic pressure in vacuum in intake pipe and the pump simultaneously, can keep the pump inner storing water, do not need when starting self-priming next time treat water again.

The nozzle arrangements design

Jet expansion diameter D is the main structure parameters of nozzle, and it affects the self-priming performance of self-priming pump, and D is the inlet diameter of nozzle, and is identical with the outlet diameter of valve body 1.L is the length of nozzle, two factors of main consideration of choosing of this parameter: the one, and the import that the current of assurance liquid jetting device ejection can enter water pump; The 2nd, after water pump entered normal working, the position of nozzle did not influence or seldom influences the performance of water pump.α is the cone angle of nozzle.

Numerical simulation

The mobile of jet-type self-priming pump Z type inlet channel is that complicated three-dimensional can not be pressed turbulent flow, and flowing in the wherein existing Z type bend pipe also has high-speed jet to flow.In order better to understand the self-priming process of pump and the mechanism of self-priming thereof, obtain satisfied self-priming effect, we select 40ZB26-12.5 type self-priming pump, nozzle at liquid jetting device jet expansion diameter d=5mm, 10mm and three specifications of 12mm, carried out numerical simulation with Fluent software stream field interior three-dimensional is can not baric flow moving, and the logarithm value Simulation result is analyzed and researched.

At Fluent software result of calculation, the water pump inlet channel internal flow situation that these three kinds of jet expansion diameters are different is analyzed respectively.

By three intermediate cross-section static pressure distribution figure as can be known, from the inlet of water pump, the static pressure of fluid reduces gradually, and promptly negative pressure increases.After running into the high speed and high pressure current that penetrate from liquid jetting device when the current of coming in from water pump inlet, static pressure has increased.The following low pressure area (the jet expansion diameter is the particularly evident of 10mm) that a local zonule can be arranged at nozzle.On the central axis at nozzle place, dynamic pressure is spurting, the dynamic pressure maximum at nozzle place, and this dynamic pressure with liquid jetting device inside is consistent.

Can see that from distribution map diameter is housed is current that the nozzle of 10mm penetrates and can form and entrainment effect preferably, the while has also just formed self-priming effect preferably in Z type runner.And diameter is the nozzle of 5mm, and flowing in the runner is least stable, will have influence on the self-priming performance of pump.

The experimental study of self-priming performance

In order further to understand the factor that influences the water pump self-suction performance, 3 kinds of self-priming pumps that we choose the utility model development have carried out the self-priming performance test.Three kinds of self-priming pumps choosing are respectively 65ZB35-25 type, 80ZB40-50 type and 100ZB40-70 type.The cone angle of getting nozzle is 8 ° and 10 °, by changing the comparative trial that different jet expansion diameters has carried out self-priming performance, and the self-priming time table when recording highly for 5m.

In self-priming time distribution map when 8 ° and 10 ° of cone angles, the self-priming time of 3 kinds of model self-priming pumps is with the change curve of orifice size.From the variation of curve and development trend thereof as can be seen, in certain scope.The jet expansion diameter is big more, and the self-priming time of water pump is short more; But after the jet expansion diameter increased to a certain degree (as 20 millimeters), self-priming time just began to increase.

Claims (2)

1, a kind of internal-mixing jetted self-priming pump, it is characterized in that: it comprises the pump housing, pump cover, impeller, suction chamber, jet chamber, pumping chamber, air-water separation chamber, water chamber, reflux valve, outlet valve, outlet valve, water intake, water outlet and transmission system;

In valve body below the suction chamber design vortex type jet chamber is arranged, the jet chamber communicates with pump housing inner storing water chamber and suction chamber, the axis of nozzle and the axis coaxle of impeller, and with pump housing cast solid; The backflow ball valve is positioned in water chamber under the backwater mouth of jet chamber;

Outlet valve is located at the air-water separation chamber top of valve body.

2, internal-mixing jetted self-priming pump as claimed in claim 1, it is characterized in that: the nozzle cone angle is 8 °～10 °, and the jet expansion diameter is 10-20 millimeters.

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