CN202417951U

CN202417951U - Total-head centrifugal pump

Info

Publication number: CN202417951U
Application number: CN2011203859413U
Authority: CN
Inventors: 陆伟刚
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2011-09-28
Filing date: 2011-09-28
Publication date: 2012-09-05
Anticipated expiration: 2021-09-28

Abstract

The utility model provides a total-head centrifugal pump, consisting of one pair or multiple pairs of impellers and river diversion housings, which are connected with one another in series, wherein each impeller is a centrifugal impeller, each river diversion housing comprises a reverse guide blade, the pumped water flow enters impeller inlets through the reverse guide blades, and outlet positioning angles of the reverse guide blades are less than 50 degrees. For the front-stage impellers of a multi-stage centrifugal pump and the impellers of a mono-stage centrifugal pump, inlet guide blades are arranged at the front of the impeller inlets, and the outlet positioning angles of the inlet guide blades are less than 50 degrees. The low-specific speed multi-stage centrifugal pump and the low-specific speed mono-stage centrifugal pump manufactured by the total-head centrifugal pump all have the characteristics of total head, so that not only can the total-head centrifugal pump be efficiently and reliably used under the working condition of high head and small flow, but also the safe and overload-free use of the pump can be further guaranteed under the working condition of low head and high flow. Furthermore, the low-specific speed impellers of the total-head centrifugal pump are easier to cast, and a water pump is higher in efficiency as well.

Description

A kind of total head centrifugal pump

Affiliated technical field

The utility model is that a kind of low specific speed does not have the overload centrifugal pump, especially should under high-lift low flow rate condition, use the total head centrifugal pump that also will under the low lift and large flow rate operating mode, use.

Background technique

At present; Known low specific speed centrifugal pump exists pump shaft power to reduce the rule that increases with lift mostly; When the power of necessary electromotor is not too big; Low specific speed centrifugal pump can only safe operation under high-lift operating mode, if under the low lift operating mode, use, and will the power overload and burn out motor.But a lot of low specific speed centrifugal pump, especially submersible pumps generally all can move the place to use, and use today under high-lift low flow rate condition, and possibly use under the low lift and large flow rate operating mode tomorrow, and this will take place that power overloads and the accident that burns out motor.Perhaps force us adopt the method for low load with strong power, supporting high power motor has strengthened investment so again, has wasted the energy.

For this reason; No. 89212885.2 patents of the patented technology that has earlier " the involute impeller that is used for rotary type fluid machine ", No. 90214606.8 patents " a kind of nothing overload low specific speed centrifugal pump impeller " and ZL200410014937.0 patent of invention " a kind of low specific speed centrifugal pump impeller design method " etc.; Improve the Changing Pattern of low specific speed centrifugal pump air horsepower through changing the impeller design method; Though obtained obvious effects but still had two problems: 1. too greatly perhaps the runner gap is too little for the cornerite of impeller blade, has increased difficulty to casting technique; 2. when improving low specific speed centrifugal pump air horsepower Changing Pattern,, pump efficiency is difficult to be up to state standards the energy-saving index of regulation to such an extent as to decreasing.

Summary of the invention

In order to overcome the deficiency that existing low specific speed centrifugal pump can not use under whole lift operating modes of water pump; The utility model provides a kind of total head centrifugal pump; Make the low specific speed centrifugal pump can safe operation under high-lift low flow rate condition; Can under the low lift and large flow rate operating mode, reliably use again, and the impeller manufacturing is easier, pump efficiency is also higher.

The technological scheme of the utility model is:

1. the total head centrifugal pump of the utility model; Be composed in series by one or more pairs of impellers and blower inlet casing; Its impeller is a receded disk impeller; Its blower inlet casing contains the return guide vane blade, and the current of pumping get into impeller inlet through the return guide vane blade, and its main innovation is: the outlet laying angle of return guide vane blade is less than 50 degree.

The outlet laying angle of return guide vane blade is meant the sensing of return guide vane blade exit and the angle of impeller sense of rotation.The outlet laying angle of return guide vane blade is main creation of the utility model less than 50 degree.The outlet laying angle of the various return guide vane blades of existing multistage centrifugal pump is all greater than 55 degree; This is because the effect that existing multistage centrifugal pump is provided with return guide vane is exactly to change the circumferential speed component of velocity vector into the axis plane velocity component; Therefore the outlet laying angle of return guide vane blade is generally got about 80 degree, and minimum can be less than 55 degree yet.

The little exit angle return guide vane that the utility model is created makes the velocity vector that gets into impeller inlet have bigger circumferential speed component, and this can reduce the original lift of impeller.But the size of circumferential speed component is directly proportional with the flow size, and therefore the declared working condition at low specific speed centrifugal pump is a low flow rate condition, and its circumferential speed component is very little, and lift reduces also seldom.And big flow operating mode, its circumferential speed component can be very big, so the lift reduction is also very big, and this just can reduce the water-horse power of big flow operating mode greatly, thereby makes low specific speed centrifugal pump at big flow operating mode non-overloading.

Because getting into the velocity vector of impeller inlet, the utility model has bigger circumferential speed component; And the sense of rotation of flow is identical with the sense of rotation of impeller; The flow angle of impeller inlet is just bigger, so the impeller inlet laying angle of the utility model just can do very greatly, and this reduces many with regard to the cornerite that makes impeller blade; Make impeller cast than be easier to, pump efficiency also increases.

2. another innovation of the utility model is: entry guide vane is housed before the first stage impeller, and the outlet laying angle of entry guide vane blade is less than 50 degree.

Existing multistage centrifugal pump does not have entry guide vane at first stage impeller as last, and individual pump has entry guide vane, is in order to prevent the flow rotation yet, and its outlet laying angle is far longer than 50 degree.The utility model has increased an entry guide vane before first stage impeller, and its outlet laying angle just can make the flow that gets into first stage impeller that bigger rotational speed is also arranged, thereby make first stage impeller that the total head characteristic also arranged less than 50 degree.

Adopt the entry guide vane of outlet laying angle, not only can make the total head characteristic of multistage centrifugal pump better, and can make single stage centrifugal pump also have the total head function less than 50 degree.So this invention not only can be used for multistage centrifugal pump, also can be used for single stage centrifugal pump.

The beneficial effect of the utility model is; Low specific speed multistage centrifugal pump and low specific speed single stage centrifugal pump with the utility model manufacturing all have the total head characteristic; Not only can under high-lift low flow rate condition, high-efficiency reliable use, can also guarantee the overload free use of safety under the low lift and large flow rate operating mode of this pump.And the low specific speed impeller of the utility model casting is than being easier to, and pump efficiency is also than higher.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Fig. 1 is that embodiment of the utility model---well is with the axial plane sectional view of submersible pump.

Fig. 2 and Fig. 3 are an embodiment's of the utility model return guide vane blade figure, and Fig. 2 is the sectional view of Fig. 3, and Fig. 3 is the plan view of Fig. 2.

Fig. 4 is another embodiment of the utility model---the axial plane sectional view of mining diving pump.

Fig. 5 is another embodiment of the utility model---the axial plane sectional view of single stage centrifugal pump.

Fig. 6 and Fig. 7 are an embodiment's of the utility model entry guide vane blade figure, and Fig. 6 is the sectional view of Fig. 7, and Fig. 7 is the plan view of Fig. 6.

Among the figure: 1. submersible motor connects seat, 2. running shaft, 3. water pump water inlet joint, 4. entry guide vane; 5. entry guide vane blade, 6. impeller, 7. blower inlet casing, 8. return guide vane blade; 9. water pump water outlet parts, the 10. outlet laying angle of return guide vane blade, the outlet laying angle of 11. entry guide vane blades.

Embodiment

Fig. 1 be the utility model at well with the embodiment in the submersible pump; It is composed in series impeller 6 and blower inlet casing 7 by many; Its impeller 6 is receded disk impellers, and its blower inlet casing 7 contains return guide vane blade 8, and the current of pumping get into impeller 6 imports through return guide vane blade 8; Itself and existing well with the difference of submersible pump be the outlet laying angle 10 of return guide vane blade less than 50 degree, this can see very clearly in Fig. 2.Another innovation of the utility model is: entry guide vane 4 is arranged before the first stage impeller, and the outlet laying angle 11 of entry guide vane blade 5 is less than 50 degree, and this can see very clearly in Fig. 3.

In this embodiment; Water pump water inlet joint 3 connects seat 1 with submersible motor and is bound up; 4 impellers 6 all are contained on the running shaft 2, and when 6 rotations of running shaft 2 impeller, the water in the motor-pumped well will be through water inlet joint 3 and entry guide vane 4; Get into impeller 6 again, get water pump from water pump water outlet parts 9 at last.The flow that from motor-pumped well, gets into water inlet joint 3 is non-rotary; The flow that gets into entry guide vane 4 from water inlet joint 3 also is non-rotary; But rotate from the flow that entry guide vane 4 gets into impeller 6; Because the outlet laying angle 11 of entry guide vane blade 5 is less than 50 degree, and its rotational speed is directly proportional with flow, this and do not have the existing water pump of entry guide vane 4 that a great difference is arranged.Because the lift of impeller is to improve with the rotational speed of impeller inlet flow to reduce, the flow of existing water pump entering first stage impeller is not rotated basically, so the lift of impeller is than higher, and its pump power is bigger naturally.But the flow rotational speed of present embodiment impeller inlet increases with flow, and the lift of therefore big flow operating mode is lower, and its pump power is also lower, and water pump just can not overload because flow increases yet.When impeller 6 is got impeller to water; The flow rotational speed is very big; The return guide vane blade 8 of blower inlet casing 7 is used for changing into the flow of high speed rotating the current of low-speed motion, because the outlet laying angle 10 of the return guide vane blade of present embodiment is less than 50 degree, so the flow that gets into next stage impellers 6 through return guide vane blade 8 remains rotation; Only its rotational speed is smaller, and reduces and littler with flow.Because low specific speed centrifugal pump is mainly used in high-lift small flow; Therefore at specified applying working condition, its lift and existing water pump are similar, but in big flow operating mode; Its flow circumferential speed component that gets into next stage impeller 6 through return guide vane blade 8 can be very big; Therefore the lift reduction is also very big, and this just greatly reduces the water-horse power of big flow operating mode, and water pump just can not overload because flow increases yet.The outlet laying angle of existing multistage centrifugal pump return guide vane blade is generally got about 80 degree; Minimum can be less than 55 degree yet; Though get into the flow of next stage impeller from blower inlet casing some circumferential speed component are arranged also, circumferential speed component is too little, reduces also very little to big flow lift; The water-horse power of therefore big flow operating mode is very big, causes the pump power overload.

Because getting into the velocity vector of impeller inlet, present embodiment has bigger circumferential speed component; Therefore the impeller inlet laying angle just can do more; This reduces many with regard to the cornerite that makes impeller blade, make impeller cast than be easier to, and pump efficiency also increases.

Fig. 4 is the embodiment of the utility model at mining diving pump, and its mode of execution and well are basic identical with submersible pump.Fig. 5 is the embodiment of the utility model at single stage centrifugal pump, and its entry guide vane blade 5 is more convenient with axial installation, and the outlet laying angle 11 of its entry guide vane blade is also less than 50 degree.

Claims

1. total head centrifugal pump; Be composed in series by one or more pairs of impellers and blower inlet casing, its impeller is a receded disk impeller, and its blower inlet casing contains the return guide vane blade; The current of pumping get into impeller inlet through the return guide vane blade, it is characterized in that: the outlet laying angle of return guide vane blade is less than 50 degree.

2. a kind of total head centrifugal pump as claimed in claim 1 is characterized in that: entry guide vane is housed before the first stage impeller, and the outlet laying angle of entry guide vane blade is less than 50 degree.