CN2212672Y

CN2212672Y - Open-type self-sucking centrifugal pump

Info

Publication number: CN2212672Y
Application number: CN 94223563
Authority: CN
Inventors: 章旭清
Original assignee: AGRICULTURAL MACHINERY INST OF ANHUI PROV
Current assignee: AGRICULTURAL MACHINERY INST OF ANHUI PROV
Priority date: 1994-10-13
Filing date: 1994-10-13
Publication date: 1995-11-15
Anticipated expiration: 2004-10-13

Abstract

The utility model relates to an open-type self-sucking centrifugal pump. The inlet on the fore boundary of the blade of the open-type impeller is cast with a circle of sealed impeller ring whose projection on the internal side is a circular arc. The internal wall of the pump case is cast with a plurality of guide blades, and the inlets are distributed uniformly along the external circumference. The water inlet bent pipe and the front wall of the pump case are respectively cast used as the front covers of the pump case. The utility model solves many problems that the ordinary open-type self-sucking centrifugal pump affects the sealing condition, the water flow state, the self-sucking performance, the pump efficiency, the finished products rate, etc.

Description

Open-type self-sucking centrifugal pump

The utility model relates to a kind of water pump, specifically a kind of open type centrifugal water pump.General open type centrifugal water pump is compared with double shrouded wheel, and its molding, casting technology are simple, and disc friction losses is little, hydraulic efficiency is higher, but front shroud position air-proof condition is relatively poor, and the requirement on machining accuracy height easily causes the low problem of volumetric efficiency, moreover owing to process conditions are limit, the single conical surface or plane are generally made in the front shroud position, and current cause the flowing state of this place's water poor by axially not having fillet to radially turning, can cause decrease in efficiency, local cavitation possibility increases.The tradition self-priming centrifugal pump is provided with return port between air-water separation chamber and spiral case, so that water pump water can circulating reflux when the starting period exhaust, and the size of this return port and position directly influence the self-priming performance of pump at starting period, influence the efficient of pump again at working stage.Also have, traditional self-priming centrifugal pump pump shell structure complexity, water inlet bend pipe, spiral case and air-water separation chamber with different spaces curved surface cast on the same foundry goods, and the casting difficulty is big, the reject rate height.

The utility model provides a kind of improved water pump structure, and it can improve the existing air-proof condition of using the self-priming water pump of open type centrifugal impeller effectively, improves pump efficiency, and simplified manufacturing technique reduces production costs.

The purpose of this utility model is achieved in that the preceding border of the blade of unshrouded impeller inlet is cast with a circle sealing opening ring; The axis plane projection of choma inboard is a circular arc; The pump case inwall is cast with many stators, and vane inlet evenly distributes along the impeller outer circumference; Water inlet bend pipe and pump case antetheca are cast separately as the pump case protecgulum.

The utility model only carries out structural simple modifications at above-mentioned three places, and can receive following effect: 1, the streamflow regime of the air-proof condition of water pump unshrouded impeller and double shrouded wheel are suitable, and have kept other advantage of unshrouded impeller; 2, the runner of forming by the stator stream circulation of when the starting of pump station graduated discharge, can supplying water, normal work stage is not provided with the problem that return port has avoided return port to exist then as outlet passage; 3, pump case protecgulum and housing individual cast are greatly simplified technology, improve casting yield.

Concrete structure of the present utility model is provided by following examples and accompanying drawing:

Fig. 1 is the axial section according to the open type self-priming centrifugal water pump concrete structure that the utility model proposes.

Fig. 2 is that the A-A of Fig. 1 is to sectional drawing.

Be cast with a circle sealing opening ring 2 in the preceding border of the blade of common unshrouded impeller 1 inlet, the inboard axis plane projection 3 of choma is a circular arc, and during pump working, its air-proof condition and streamflow regime can be suitable with double shrouded wheel, kept other advantage that unshrouded impeller possessed simultaneously.Many (present embodiment adopts 3) stators 5 evenly distribute along the impeller outer circumference and are cast on the inwall of pump case, and the runner 6 that stator constituted can play following effect: in the starting of pump station stage, the current after carbonated drink is separated circulate by these runners; In the pump working stage, it is normal outlet passage.Because stator is uniform in the same way, can eliminate the illeffects that radial imbalance force causes.Water inlet bend pipe 8 and pump case antetheca are cast separately as pump case protecgulum 7, rely on positioning spigot 9 and connecting bolt and pump housing positioning and fixing, and the two traditional pump case that is cast as one is greatly simplified aspect casting manufacturability, and yield rate can improve more than 20%.

Three structural improvement that the utility model proposed both can realize on same pump, and were also detachable, as the water pump combination of single improvement and other structure.

Claims

1, a kind of open type self-priming centrifugal water pump, by impeller, pump case constitutes, and it is characterized in that:

The preceding border of the blade of a, unshrouded impeller inlet is cast with a circle sealing opening ring;

B, pump case inwall are cast with many stators;

C, pump case protecgulum are made of the water inlet bend pipe and the pump case antetheca of independent casting.

2, water pump according to claim 1, the axis plane projection that it is characterized in that the sealing opening ring inboard is a circular arc.

3, water pump according to claim 1 is characterized in that the import of many stators evenly distributes along the impeller outer circumference.