CN104763642A

CN104763642A - Jet pump device

Info

Publication number: CN104763642A
Application number: CN201510135334.4A
Authority: CN
Inventors: 李红; 邹晨海; 陈超; 王海渠; 叶道星
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2015-03-26
Filing date: 2015-03-26
Publication date: 2015-07-08
Anticipated expiration: 2035-03-26
Also published as: CN104763642B

Abstract

The invention belongs to a jet pump device, in particular to a jet pump device which shortens the pump filling time before starting. The invention realizes that when starting up for the first time, it only needs to fill up the return water pipe at one time to start up, without shutting down for watering again, and not needing to fill up water again when it is used next time, which greatly shortens the starting time. The invention consists of a centrifugal pump, a jet pump, a self-operated regulating valve, a check valve, a gate valve and pipelines. Through the centrifugal pump including double-layer pump chamber, exhaust valve, flap valve and return hole, etc., the gas in the jet pump is discharged in conjunction with the switch of the self-operated regulating valve, so that it can be started only by filling the return pipe. Through the switch of the gate valve, it can be directly started again without irrigation.

Description

A kind of jet pump device

Technical field

The present invention relates to a kind of jet pump device, particularly relate to a kind of jet pump device shortening the startup front pump priming time.

Background technique

The height that Ordinary Centrifugal Pumps is installed is determined by the cavitation erosion performance of pump itself, generally cannot more than 8m.Jet pump device is by centrifugal pump, Jet injector and enter water return pipeline etc. and form, rely on the Jet injector secondary pressurized at the bottom of immersion water, the suction head of jet pump device is made to reach more than 9m, even more than hundred meters, considerably beyond the suction head of Ordinary Centrifugal Pumps, contrast other high suction depth water lift utensils, it is simple that jet pump device has structure, the features such as cost is low, therefore, jet pump device is widely used and draws water in the lower rivers of water level and well.

Conventional fluidic pump-unit, structural type is as high lift water pump for deep well (CN90201514.1), water-carryingjet device for deep well (CN90204075.8) and externally-connected jet device with preposed water pump (CN200910112556.9) etc., during startup, need pour water from outlet of centrifugal pump, through spiral case and impeller, water just can enter intake pipe and return pipe, and intake pipe and return pipe are connected by Jet injector, the nozzle flow section of Jet injector is very little, be generally about 1/10th of return pipe, in addition, because jet pump device has larger setting height(from bottom), need the intake pipe grown very much and return pipe, if when jet pump device runs, in pipeline, gas does not drain, device performance will be affected, there is cavitation erosion to cause damage to centrifugal pump and Jet injector.Reason in sum, jet pump device needs to pour water for a long time before activation, and wants continuous start and stop water pump to ensure to drain gas, and the irrigation method of this conventional fluidic pump-unit is not only consuming time, and pipeline easily occurs pneumatosis, affects device performance.

In addition, the non-mounted valve in conventional fluidic pump-unit outlet port, still need to pour water, and traditional Jet injector bottom valve is spring check valve when again starting after shutdown, and parthydraulic loss is large, and spring easily lost efficacy.

Therefore, develop one and can greatly simplify turn on pump process, the jet pump device saving starting time is significant, and the jet pump device at present with minimizing turn on pump process is all add extra equipment to realize shortening the pump priming time before centrifugal pump inlet, as jetted self-priming device (CN201420310194.0), before centrifugal pump, add venting gas appliance to reduce starting time, this type of jet pump device adds the cost that equipment & installation is safeguarded.

The present invention proposes a kind of jet pump device, only once need fill return pipe can start shooting when initiating switchup, pours water without the need to again shutting down, and next time uses without the need to again pouring water, and substantially reduces starting time.

Summary of the invention

Technical problem to be solved by this invention is, need when starting for jet pump device to pour water for a long time and the problem of repeatedly start and stop motor, providing one only needs initiating switchup once to fill return pipe, again starts the jet pump device without the need to pouring water.

For solving the technical problem of above-mentioned existence, present invention employs following scheme: a kind of jet pump device, comprising centrifugal pump 1, Jet injector 5 direct-operated regulator 8, safety check 7, gate valve 9, described centrifugal pump 1 respectively with intake pipe 2 and return pipe 3 UNICOM; Described intake pipe 2 is connected with the outlet of Jet injector 5, and described return pipe 3 is connected with the import of Jet injector 5 by direct-operated regulator 8; The elbow of described intake pipe 2 is provided with water filling port 10, described water filling port 10 is positioned at elbow top, check valve is provided with in water filling port 10, check valve valve port has the straight length for being socketed water hose, the entrance point of the suction sleeve 6 of described Jet injector 5 is provided with safety check 7, and described outlet pipe 4 is connected with return pipe 3 by gate valve 9.

In such scheme, described safety check 7 is gravity type check valve with check valve, and it relies on the self gravitation of flap to close to prevent water from flowing backwards.

In such scheme, described centrifugal pump 1 is the centrifugal pump of double-layer pump body, and pump chamber 14 forms pump housing exocoel, the Inner Constitution pump housing inner chamber of spiral case 13, and the import of described centrifugal pump 1 is a little more than impeller 12 upper limb; Described impeller intake pipe 17 one end connects centrifugal pump 1 import, and described impeller intake pipe 17 the other end connects impeller 12; Described pump housing inner chamber is provided with backwater hole 11, and described backwater hole 11 communicates with pump chamber 14, and shape is circular, and area is determined according to device total discharge; Outlet valve 15 is provided with above described pump chamber 14.

In such scheme, be provided with ball 18 in described outlet valve 15, valve block internal diameter is 1.2 to 1.5 times of ball 18 diameter; The valve body of outlet valve 15 is also provided with upper lever stopper 20 and lower lever stopper 19, described upper lever stopper 20 and the opening diameter of lower lever stopper 19 are 0.6 to 0.8 times of ball 18 diameter.

In such scheme, described intake pipe 2 is connected with the import of centrifugal pump 1, and described inlet is provided with a flat flap valve 16, and described flat flap valve 16 material is rubber.

In such scheme, when the pressure of the valve inlet of described direct-operated regulator 8 reaches pressure designated value, valve is opened automatically, and described pressure designated value is t, trepresentation as follows:

g---direct-operated regulator 8 to return pipe 3 elbow water yield gravity;

p---centrifugal pump 1 outlet pressure;

s---return pipe 3 discharge section area.

The invention has the beneficial effects as follows: 1, when jet pump device starts, directly pour water without the need to switch valve, turn on pump is got final product when water level reaches outlet of centrifugal pump, now direct-operated regulator is closed condition, utilize the self-priming venting capacity of centrifugal pump self, after exhaust completes, jet pump device just can normally work, without the need to repeatedly start and stop water pump; 2, after first time pours water startup, again start and pour water without the need to continuing, after opening outlet valve, turn on pump can make jet pump device normally run.

Accompanying drawing explanation

Fig. 1 is jet pump device structural representation of the present invention.

Fig. 2 is centrifugal pump structure schematic diagram.

Fig. 3 is centrifugal pump internal structure schematic three dimensional views.

Fig. 4 is exhaust structure schematic diagram.

Fig. 5 is the structural representation of direct-operated regulator.

1. centrifugal pump, 2. intake pipe, 3. return pipe, 4. outlet pipe, 5. Jet injector, 6. suction sleeve, 7. safety check, 8. direct-operated regulator, 9. gate valve, 10. water filling port, 11. backwater holes, 12. impellers, 13. spiral cases, 14. pump chambers, 15. outlet valves, 16. flat flap valves, 17. impeller intake pipes, 18. ball, 19. lower lever stoppers, 20. upper lever stoppers, 21. actuators, 22. PRESSURE PIPE, 23. springs, 24. spools, 25. valve seats.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described.

As shown in Figure 1, a kind of jet pump device, comprise centrifugal pump 1 and Jet injector 5, described centrifugal pump 1 and described Jet injector 5 are linked together by intake pipe 2 and return pipe 3, suction sleeve 6 inlet of Jet injector 5 is provided with safety check 7, is provided with direct-operated regulator 8 between Jet injector 5 and return pipe 3, and described direct-operated regulator 8 is one-way valve, automatically open when the force value on valve top reaches specified pressure, described pressure set points t, trepresentation is as follows:

g---direct-operated regulator is to return pipe elbow water yield gravity;

p---outlet of centrifugal pump pressure;

s---return pipe discharge section area.

The elbow of described intake pipe 2 is provided with water filling port 10, and described water filling port 10 is positioned at elbow top, is inside provided with check valve, and valve port has the straight length for being socketed water hose, and outlet pipe 4 place is connected with return pipe 3 by gate valve 9.

As Figure 2-3, described centrifugal pump 1 comprises impeller 12, impeller intake pipe 17, pump chamber 14, outlet valve 15, centrifugal pump 1 import is a little more than impeller 12 upper limb, described impeller intake pipe 17 inlet is provided with flat flap valve 16, described flat flap valve material is rubber, described impeller intake pipe 17 end is connected with impeller 12, described impeller 12 is positioned at spiral case 13, described spiral case 13 outlet faces outlet of centrifugal pump, backwater hole 11 is provided with in the below of spiral case 13, backwater hole 11 communicates with pump chamber 14, backwater hole 11 shape is circular, area is determined according to device total discharge, be outlet valve 15 above described pump chamber 14, described outlet valve is ball automatic close-type valve, valve block internal diameter is 1.2 to 1.5 times of glueballs diameter, valve body upper lever stopper and lower lever stopper opening diameter are 0.6 to 0.8 times of glueballs diameter.The vibrational power flow of the logical described double-layer pump body of centrifugal pump 1 excessively and the mating reaction of outlet valve 15, impeller 12 and backwater hole 11, described centrifugal pump 1 greatly improves the efficiency of exhaust, optimizes the effect of exhaust, and greatly shortens the starting time of jet pump device.

As shown in Figure 4, when containing gas in pump chamber 14, gas adds pressure jack-up ball 18 at impeller 12, and discharge from valve body both sides, when being full of water in pump chamber 14, ball 18 is compressed upper lever stopper 20 by pressure water, forms sealing.

As shown in Figure 5, the outlet pressure of direct-operated regulator 8 is as feedback signal, the elastic force of described pressure and spring 23 balances, actuator 21 is introduced by PRESSURE PIPE 22, drive spool 24 motion to reach the object changing valve opening degree, when pouring water, spool 24 inserts in valve seat 25 and forms sealing, when the force value of valve inlet reaches specified pressure, spool 24 is opened automatically.

Workflow: carry out pump priming by the water filling port 10 of intake pipe 2 elbow, due to the throttling action of direct-operated regulator 8, water fills Jet injector 5 suction chamber and intake pipe very soon, and successively by flat flap valve 16 and impeller intake pipe 17, enter impeller 12 and spiral case 13, stop after filling whole pump chamber pouring water and starting centrifugal pump 1.Now, return pipe 3 to Jet injector 5 nozzle segment still has a large amount of gas not discharge, after centrifugal pump running, water and air flows into impeller 12 and spiral case 13 through impeller intake pipe, water and air acts on through impeller 12 and enters pump chamber 14 from spiral case drain opening and carry out gas-liquid separation, gas is discharged from outlet valve 15, water in pump chamber 14 after gas-liquid separation is back to impeller outer edge through backwater hole 11, carry out gas-liquid mixed again, continuous circulation drains the gas in suction line and the pump housing, centrifugal pump 1 inlet forms negative pressure, under atmospheric action, water constantly enters Jet injector 5 from suction sleeve 6, centrifugal pump 1 is entered again from intake pipe 2, return pipe 3 and outlet pipe 4 is entered respectively after centrifugal pump 1 pressurizes, when return pipe 3 is filled, direct-operated regulator 8 is opened under pressure automatically, jet pump device enters normal working.Before termination of pumping, close the gate valve 9 on outlet pipe 4, when after closedown centrifugal pump 1, water is stored in jet pump device under the effect of flat flap valve 16 and safety check 7, and next time starts without the need to again pouring water.

Claims

1. A jet pump device, characterized in that it includes a centrifugal pump (1), a jet pump (5), a self-operated regulating valve (8), a check valve (7), a gate valve (9), and the centrifugal pump (1 ) are respectively connected with the water inlet pipe (2) and the return pipe (3); the water inlet pipe (2) is connected with the outlet of the jet pump (5), and the return pipe (3) is connected with the jet pump The inlet of the pump (5) is connected; the elbow of the water inlet pipe (2) is provided with a water filling port (10), and the water filling port (10) is located at the upper part of the elbow, and a check valve is arranged in the water filling port (10) , the valve port of the check valve has a straight pipe section for socketing the irrigation hose, the inlet end of the suction pipe (6) of the jet pump (5) is provided with a check valve (7), and the outlet pipe (4) passes through The gate valve (9) is connected with the return pipe (3).

2. A jet pump device according to claim 1, characterized in that: the check valve (7) and the check valve are both gravity check valves, which are closed by the gravity of the disc to prevent water Backflow.

3. A jet pump device according to any one of claims 1-2, characterized in that: the centrifugal pump (1) is a centrifugal pump with a double-layer pump body, and the pump cavity (14) constitutes the pump body cavity , the inside of the volute (13) constitutes the inner cavity of the pump, and the inlet of the centrifugal pump (1) is slightly higher than the upper edge of the impeller (12); one end of the impeller inlet pipe (17) is connected to the inlet of the centrifugal pump (1), and the impeller The other end of the water inlet pipe (17) is connected to the impeller (12); the inner cavity of the pump body is provided with a water return hole (11), and the water return hole (11) communicates with the pump chamber (14).

4. A jet pump device according to claim 3, characterized in that: the shape of the return water hole (11) is circular, and the area depends on the total flow rate of the device; above the pump chamber (14) there is a drain Air valve (15).

5. A jet pump device according to claim 4, characterized in that: the exhaust valve (15) is provided with a rubber ball (18), and the inner diameter of the valve is 1.2 to 1.5 of the diameter of the rubber ball (18). times; the valve body of the exhaust valve (15) is also provided with an upper stop plate (20) and a lower stop plate (19), and the opening diameters of the upper stop plate (20) and the lower stop plate (19) are rubber balls (18) 0.6 to 0.8 times the diameter.

6. A jet pump device according to claim 1, characterized in that: the water inlet pipe (2) is connected to the inlet of the centrifugal pump (1), and a flat flap valve (16) is provided at the inlet, The flat flap door (16) is made of rubber.

7. A jet pump device according to claim 1, characterized in that: when the pressure at the valve inlet of the self-operated regulating valve (8) reaches a specified pressure value, the valve opens automatically, and the specified pressure value is T , The expression of T is as follows:

G ——The gravity of the water volume at the elbow from the self-operated regulating valve (8) to the return pipe (3);

P - centrifugal pump (1) outlet pressure;

S ——The cross-sectional area of the water return pipe (3).