CN2303102Y

CN2303102Y - Multi-stage centrifugal pump with constant pressure

Info

Publication number: CN2303102Y
Application number: CN 96245809
Authority: CN
Inventors: 孙兆宁; 阎先庆; 孙启滨; 吴业贞
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-11-05
Filing date: 1996-11-05
Publication date: 1999-01-06
Anticipated expiration: 2006-11-05

Abstract

The utility model discloses a multistage centrifugal pump with constant pressure, which relates to the class of centrifugal pumps. The multistage centrifugal pump with constant pressure is formed by that a water inlet section 1, a plurality of middle sections 2 and a water outlet section 3 are connected via draw rods; a pump shaft is directly connected with the shaft of a motor 5 via a coupling rack 4; a pressure control device is connected between a water inlet pipe 13 and a water outlet pipe 10 of the pump, and the pressure control device is composed of pressure regulating safety valves connected by pipelines. The pump has compact structure, small ground occupation and high efficiency. When water pressure exceeds a set value, the pressure regulating safety valves can be automatically opened for relieving the pressure; when the pressure decreases to the set value, the safety valves can be automatically closed in time, so that water supply pipelines can not be damaged due to the raised fixed pressure. The utility model is widely used for situations having constant water supply pressure and variable flow rate, and can be used as a special pump for fire protection.

Description

The constant voltage multistage centrifugal pump

The constant voltage multistage centrifugal pump relates to the centrifugal pump class.

The multistage centrifugal pump that prior art provided, mostly be vertical, have compact structure, floor space is little, noise is low, efficient is high, all adopts the water intake direct connection intake pipe of inlet segment, the water outlet direct connection outlet conduit of water exit end, its deficiency is that when pump duty changed, water outlet pressure changed thereupon, be that flow is when big, pressure reduces, flow hour, and pressure increases.In special use occasion, need with flow hour, pump discharge pressure increases and tends to damage water supply piping system.

The purpose of this utility model is to overcome the above-mentioned deficiency of prior art, and a kind of advantage that still possesses existing MODEL VERTICAL MULTISTAGE PUMP is provided, when need reduce with pump duty, and the constant voltage multistage centrifugal pump that outlet pressure is constant.

Technical solution of the present utility model is to connect pressure control device between multistage centrifugal pump inlet tube and

outlet tube

13,10, it connects the water outlet 26 that 90 ° of bend pipes 12,8,90 ° of bend pipes of connecting tube 7 connect regulator valves 6 in turn by the orthogonal mouth of pipe of water inlet three-way pipe 11, and its water intake 27 connects water outlet three-way pipes 9 and forms.Utilize pressure control device, make pump discharge pressure when changes in flow rate, keep constant.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1. be constant voltage multistage centrifugal pump structural representation.

Fig. 2. be the A-A sectional view of Fig. 1.

.1. inlet segment among the figure; 2. stage casing; 3. water exit end; 4. hitch; 5. motor; 6. regulator valve; 7.90 ° bend pipe; 8. connecting tube; 9. water outlet three-way pipe; 10. outlet pipe; 11. water inlet three-way pipe; 12.90 ° bend pipe; 13. intake pipe; 14. valve body; 15. valve seat; 16. valve is done; 17. Disc holder; 18. guide sleeve; 19. valve gap; 20. valve rod; 21. spring; 22. spring seat; 23. adjustment screw rod; 24. safety cover; 25. adjustment nut; 26. water outlet; 27. water intake.

This Multi-stage centrifugal pump with constant pressure structure as shown in Figure 1, 2, it is connected by inlet segment 1, more piece stage casing 2, water exit end 3 usefulness pull bars. Hitch 4 makes the axle of pump shaft direct-coupled electrical machinery 5 consist of MODEL VERTICAL MULTISTAGE PUMP, the inlet tube and outlet tube 13 of water-in and water-out section, 10 flange plate bolts connect water-in and water-out three-way pipe 11,9, and their 90 ° of bend pipes 12 of orthogonal mouth of pipe series connection, tube connector 8,90 ° of bend pipes 7, the delivery port 26 of regulator valve 6, water inlets 27 all connect the pressure control device that consists of with flange plate bolt and form. Regulator valve 6 by valve body 14, in-built valve seat 15, seat mouth have that valve does 16, establish upper and lower spring base 22 in the valve gap 19 of cover Disc holder 17, valve body top dress fairlead 18, bolted on connection, spring 21, valve rod 20, valve rod lower end be actively coupled Disc holder 17; slide and penetrate in the hole of adjusting screw rod 23 in top; screw rod and valve gap 19 thread connection suitable for reading are fastening with adjusting nut 25, and bonnet protective cover 24 consists of. The impeller of vertical multi-stage centrifugal pump, but to lead the part outer surface chromium plating such as different, axle sleeve, balancing drum, balance set antirust, and the flow passage part runner is done preservative treatment, but the seat of seat valve 15 mouthful, Disc holder 17 interior seal pile-up welding hard alloys and wear-resisting.

The use of this constant voltage multistage pump and adjustment:

This pump structure, assembling, dismounting, installation, starting, turn round and stop with existing centrifugal multistage pump multiple centrifugal pump. Main structure is Bonding pressure control device between the water inlet pipe of pump and outlet pipe, and setting pressure is with precession and the back-out of adjusting screw rod 23, gives pressing spring 21 and sets up. When setting up required pressure. It is fixing to tighten adjusting nut 25. When pump discharge pressure during less than regulator valve 6 setting pressure, water is by the straight pipe of inlet triplet for water pipe 11, enter pump through water inlet pipe 13, and the press water in the pump all enters supply channel through the straight pipe of outlet pipe 10, outlet three way pipe 9; When pump discharge pressure during greater than the setting pressure of regulator valve 6, over pressure water by the outlet three way pipe orthogonal mouth of pipe enter that valve that water inlet 27 backs down regulator valve 6 does 16, Disc holder 17, Compress Spring 21, a part of press water through delivery port 26, bend pipe 7, tube connector 8, bend pipe 12, enter the orthogonal pipe of inlet triplet for water pipe 11, the straight pipe of return tee joint pipe 11, enter water inlet pipe 13 and return pressure release in the pump, be that pressure is when surpassing permissible value, regulator valve is opened automatically, then part or full dose discharging, prevent that loine pressure from continuing to raise, when pressure decreased arrives setting, the timely autoshutdown of safety valve. Keep supply channel when changes in flow rate, pressure of supply water is constant.

This constant voltage multistage centrifugal pump has the advantage of MODEL VERTICAL MULTISTAGE PUMP: compact structure, floor space is little, noise is low, 150DLX type pump efficiency can reach 72%～76%, the pressure adjusted value 0.50～2.25MPa of pressure control device, total head and flow as in a single day selected pump, pump less than the Chosen Point flow when the zero delivery scope is worked, delivery side of pump pressure is constant, outlet pressure is during greater than the regulator valve setting value, and over pressure water returns to be let out, and keeps by establishing pressure water supply.Can guarantee the safe operation of a whole set of fire-protection equipment like this, the minimizing of reason fire-fighting lance quantity does not cause pumping pressure to raise and damages pipeline.

It is constant that this constant voltage multistage centrifugal pump extensively is adapted to pressure of supply water, the transformable water supply occasion of flow.Can be used as the fire-fighting dedicated pump.

Embodiment:

Model	Progression	Flow Q m ²/h	Total head H m	Rotating speed H r/min	Power of motor N KW	Efficiency eta %	Essential net positive suction head r m	Regulator valve adjusted value MPa
Model	Progression	Flow Q m ²/h	Total head H m	Rotating speed H r/min	Power of motor N KW	Efficiency eta %	Essential net positive suction head r m	Regulator valve adjusted value MPa	40DLX
	6	4.9 6.2 7.4	74.4 70.8 64.8	1450	4	37 40 39		0.71	40DLX
	6	4.9 6.2 7.4	74.4 70.8 64.8	1450	4	37 40 39		0.71	50DLX	6	9.0 12.6 16.2	79.8 73.2 63.6	1450	5.5	50 54 52	2.58 2.66 3.16	0.73
65DLX	10	18 30 35	185 160 145	1450	30	56 62 60	2.41 2.82 3.03	1.60	50DLX	6	9.0 12.6 16.2	79.8 73.2 63.6	1450	5.5	50 54 52	2.58 2.66 3.16	0.73
65DLX	10	18 30 35	185 160 145	1450	30	56 62 60	2.41 2.82 3.03	1.60	80DLX	10	32.4 50.4 65.16	216 200 171	1450	55	60.7 70 66.5	2.16 2.49 2.82	2.00
100DLX	8	72 100 126	174 160 136	1450	75	65 72 70	2.83 3.53 4.40	1.60	80DLX	10	32.4 50.4 65.16	216 200 171	1450	55	60.7 70 66.5	2.16 2.49 2.82	2.00
100DLX	8	72 100 126	174 160 136	1450	75	65 72 70	2.83 3.53 4.40	1.60	150DLX	2	120 160 200	53 50 44	1450	37	72 76 73	3.1 3.5 3.8	0.50
9	120 160 200	239 225 198	1450	160	72 76 73	3.1 3.5 3.8	2.25			2	120 160 200	53 50 44	1450	37	72 76 73	3.1 3.5 3.8	0.50

Claims

1, constant voltage multistage centrifugal pump, it is connected by inlet segment 1, more piece stage casing 2, water exit end 3 usefulness pull bars, hitch 4 is formed the axle of pump shaft direct-coupled electrical machinery 5, it is characterized in that inlet segment 1 usefulness intake pipe 13,11,90 ° of bend pipes 12 of water inlet three-way pipe, 8,90 ° of bend pipes 7 of connecting tube, regulator valve 6, water outlet three-way pipe 9, outlet pipe 10 UNICOM's water exit ends 3.