CN2530072Y

CN2530072Y - Centrifugal pump

Info

Publication number: CN2530072Y
Application number: CN 01262527
Authority: CN
Inventors: 黄健; 黄福成
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-31
Filing date: 2001-08-31
Publication date: 2003-01-08
Anticipated expiration: 2011-08-31

Abstract

A centrifugal pump is composed of a pump body, a pump shaft, an impeller and the other parts. The impeller is fastened on the pump shaft, on which a bracket is secured. The bracket is fastened on the pump body by a rear cover. A water vapor fission chamber is arranged between an outlet pipe and the impeller, and a storage chamber is positioned at the lower end of the pump body. The utility model is characterized in that: for a through hole for breaking the siphon is mounted between an inlet pipe and the water vapor fission chamber, when the pump is cut off, the through hole can prevent the liquid in the storage chamber from siphon, and the pump is ensured to be in the auto absorption state. In order to shorten the time of the auto absorption, a pumping chamber is installed on the pump body, and a balancing hole is positioned on the blade of the impeller, for reducing the pressure to the mechanical seal.

Description

Centrifugal pump

Technical field: the utility model relates to a kind of centrifugal pump.

Prior art: centrifugal pump is widely used in industries such as urban construction, oil, chemical industry, metallurgy, pharmacy and food processing.At present, Ordinary Centrifugal Pumps used on the market all is " self-priming " formula, an apotheca is arranged in the pump housing exactly, the inside contains certain liquid, when turn on pump originally,, the water liquid in the apotheca or other liquid medium are got rid of aqueous vapor separation chamber in the supreme face-pumping body carry out aqueous vapor and separate by the rotation of impeller, carry out so repeatedly just the air in the inlet tube to be evacuated, thereby reach the purpose of " self-priming ".After but this self-priming centrifugal pump quits work, thereby the liquid in the outlet conduit can flow backwards in inlet pipeline and cause the liquid in the pump housing apotheca to be fallen by siphon, centrifugal pump did not reach the purpose of " self-priming " when started next time, so that prevent the generation of this siphonage, must pump advance or outlet conduit on load onto the purpose that a check valve or safety check etc. can be guaranteed self-priming.Adopt the centrifugal pump of this structure to have complex structure, shortcoming such as lack, cost an arm and a leg working life.

Technological scheme: in order to overcome above-mentioned defective, the utility model provides a kind of neotectonics of centrifugal pump, and purpose provides a kind of self-priming structure of simple in structure, cheap, long service life.

Centrifugal pump described in the utility model is by impeller, pump shaft, the pump housing, inlet pipeline, outlet conduit, carriage and bonnet etc. are partly formed, pump shaft by bearing fixing on carriage, carriage is by being bolted on the bonnet, bonnet is by being bolted on the pump housing, end at pump shaft is fixed with impeller, an inlet pipeline and an outlet conduit are arranged respectively on the pump housing, an apotheca is arranged below the pump housing, near on the pump housing at outlet conduit place an aqueous vapor separation chamber is being arranged, it is characterized in that: the through hole that is drilled with broken siphon about a φ 10mm at the inlet pipeline place, the through hole of broken siphon links to each other with the aqueous vapor separation chamber, when pump quits work, after the liquid of outlet conduit flows back to inlet pipeline, air in the outlet conduit can enter in the inlet pipeline from through hole rapidly, thereby prevented that the liquid in the apotheca from being advanced in the inlet pipeline by siphon, guaranteeing does not need to irritate liquid again and self-priming before the next turn on pump.

In order to shorten the centrifugal pump self-priming time in when start, a pumping chamber is housed in the pump housing, its effect is further to utilize liquid to carry out aqueous vapor to separate, thereby air in the inlet pipeline is evacuated rapidly and shortens self-priming time.Pumping chamber and pump housing individual cast can be convenient to the pumping chamber surface like this and process, and remove the burr and the interlayer runner on surface, prevent from choking phenomenon to occur in the pump housing operation process, improve the working life of the pump housing.

The mechanical seal of centrifugal pump is increased along with lift of pump and the pressure that bears also increases thereupon, cause leakage phenomenon in order to prevent its damage, on each blade of impeller, be drilled with a 8-10mm equalizing orifice, pump in the course of the work like this, effect by equalizing orifice can reduce the pressure to mechanical seal, make mechanical seal not fragile, and improve the working life of pump.

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

1. the self-priming of centrifugal pump is simple in structure, respond well.

2. on centrifugal pump, be provided with a pumping chamber, can shorten self-priming time, improve the self-priming effect.

3. pumping chamber and pump housing individual cast make things convenient for the pumping chamber surface Machining, can remove surperficial burr and interlayer runner very soon, prevent choking phenomenon.

4. an equalizing orifice is respectively arranged on each blade of impeller, reduced the pressure of mechanical seal, improve the working life of mechanical seal.

Description of drawings: Fig. 1 is the structural representation of centrifugal pump described in the utility model.1. inlet pipeline 2. through holes 3. screws 4. pump housings 5. apothecas 6. impellers 7. equalizing orifices 8. pump shafts 9. bearings 10. carriages 11. mechanical seals 12. bolts 13. bonnets 14. bolts 15. pumping chambers 16. aqueous vapor separation chambers 17. outlet conduits

Most preferred embodiment: as can be seen from Figure 1, centrifugal pump described in the utility model partly is made up of the pump housing 4, pump shaft 8, impeller 6, carriage 10, bonnet 12, inlet pipeline 1 and outlet conduit 17 etc.Impeller 6 is fixed on an end of pump shaft 8, pump shaft 8 is installed on the carriage 10 by bearing 9, carriage 10 is fixed on the bonnet 13 by bolt 12, between bonnet 13 and the pump shaft 8 mechanical seal 11 is housed, bonnet 13 is fixed on the pump housing 4 by bolt 14, one apotheca 5 is arranged in the lower end of the described pump housing 4, one aqueous vapor separation chamber 16 is arranged in the upper end of the pump housing 4, aqueous vapor separation chamber 16 links to each other with outlet conduit 17 away from an end of impeller 6, it is characterized in that: the through hole 2 that a broken siphon is arranged between inlet pipeline 1 and aqueous vapor separation chamber 16.After pump quits work, liquid in the outlet conduit 17 can flow backwards in inlet pipeline 1, when liquid flows to through hole 2 belows, gas in the outlet conduit 17 can directly directly be inhaled in the inlet pipeline 1 by through hole 2, will prevent that like this liquid is fallen by siphon in the pump housing 4 below apothecas 5, thereby make the each start of centrifugal pump can both reach " self-priming " purpose.In order to shorten " self-priming " time, improve the working efficiency of pump, between aqueous vapor separation chamber 16 and impeller 6, there is a pumping chamber 15 to be fixed in the pump housing 4 by screw 3, pumping chamber 15 is castings separately, so both can improve the yield rate of the pump housing 4 castings, can be convenient to remove the burr and the interlayer runner on the pump housing 4 and pumping chamber 5 surfaces again, prevent the obstruction of pump, improve the working efficiency of pump.In addition, along with pumping head increases, pressure in the pump housing also increases thereupon, can make mechanical seal 11 damages so easily and cause leakage phenomenon, in order to reduce pump when running pressure to mechanical seal, on each blade of impeller 6, respectively open a φ 8-10mm equalizing orifice 7, replace the secondary gluten at original impeller 6 back sides, adopt this decompression method that is greatly improved the working life of pump.

Claims

1, a kind of centrifugal pump is by the pump housing (4), pump shaft (8), impeller (6), carriage (10), bonnet (12), inlet pipeline (1) and outlet conduit (17) part are formed, impeller (6) is fixed on an end of pump shaft (8), pump shaft (8) is installed on the carriage (10) by bearing (9), carriage (10) is fixed on the bonnet (13) by bolt (12), between bonnet (13) and the pump shaft (8) mechanical seal (11) is housed, bonnet (13) is fixed on the pump housing (4) by bolt (14) again, in the lower end of the described pump housing (4) apotheca (5) is arranged, in the upper end of the pump housing (4) an aqueous vapor separation chamber (16) is arranged, aqueous vapor separation chamber (16) links to each other with outlet conduit (17) away from an end of impeller (6), it is characterized in that: between inlet pipeline (1) and aqueous vapor separation chamber (16) through hole (2) is arranged.

2, centrifugal pump according to claim 1 is characterized in that: between aqueous vapor separation chamber (16) and the impeller (6) pumping chamber (15) is arranged, described pumping chamber (15) is fixed on the pump housing (4) by screw (3).

3, according to claim 1,2 described centrifugal pumps, it is characterized in that: an equalizing orifice (7) is respectively arranged on each blade of described hour wheel (6).