CN2110730U

CN2110730U - Centrifugal slurry pump

Info

Publication number: CN2110730U
Application number: CN 91225682
Authority: CN
Inventors: 孟庆昆; 陈香凯; 阎旭
Original assignee: MACHINERY INST PETROLEUM PROSP
Current assignee: MACHINERY INST PETROLEUM PROSP
Priority date: 1991-09-30
Filing date: 1991-09-30
Publication date: 1992-07-22

Abstract

The utility model discloses a centrifugal slurry pump which is the equipment matched with the three-cylinder pump. The utility model is characterized in that the flow passage component structure of a designed main impeller, a water pressing chamber, water absorbing chamber, etc. can make the main impeller, the water pressing chamber, and the water absorbing chamber have better hydraulic performance; the mutual matching of the main impeller, the water pressing chamber, and the water absorbing chamber can reduce the radial force and the axial force of the main impeller so as to improve the pump efficiency; the axis sealing system adopts the floating type combined power sealing structure, which has good sealing effect and strong reliability; the floating type combined power sealing structure can avoid the problem of the slurry going to the sealing system. The pump can effectively convey the slurry in the condition of the relative large change of the specific gravity of slurry and the change of the working status. The utility model can be popularized in the axial sealing system of other type liquid-solids pump.

Description

Centrifugal slurry pump

The utility model relates to a kind of drilling mud charge pump that contains solid phase particles that is used to carry, particularly with the matching used centrifugal charge pump of 3NB series three cylinder drilling pumps.

Present widely used oil-well rig mud charge pump, its main impeller, pumping chamber and suction chamber adopt the beam flow flow theory to design more.Because this theory is in the mobile phase of having supposed the mobile and unlimited multiple-blade Ye Daonei ideal fluid in the impeller channel seemingly, flow characteristic only changes along leaf road center line, do not consider to design under the situation of flow losses that the ternary viscous flow of obvious this design method and actual limited multiple-blade Ye Daonei is inconsistent.Particularly this conveying of mud charge pump contains flowing state complicated more in the centrifugal pump of solid phase particles, design with the beam flow flow theory, obviously exist fatal shortcoming: the flowing state of impeller Ye Daonei is abominable, there is very big import impact loss, the separation of flow, secondary flow and outlet separation losses.Must cause this class pump efficiency lower, the service behaviour instability, operating mode accommodation is narrow, influence and the effective supporting use of three cylinder drilling pumps.

In addition, well-known, what the mud charge pump that uses all adopted at present is the packing box seal mode, and this sealing means exists serious deficiency; Be that it can't stop mud to contact with filler, particularly under the situation of using high gravity mud, mud particle enters in the packing seal inevitably, and along with the increase of working time, filler is worn and destroys the spray leakage that causes mud.Even more serious is, the solid phase particles of Fa Shenging direct wearing and tearing pump shaft in filler thus is to cause the one of the main reasons that the pump life-span reduces.

At the problems referred to above, the purpose of this utility model is to provide a kind of rational in infrastructure, impeller hydraulic efficiency height, stable performance, sealing is difficult for leakage, and both having made is slurry conveyed under the condition of mud balance variation and variable working condition, the centrifugal charge pump of still reliablely and stablely working.

Task of the present utility model is achieved in that by suction chamber, pumping chamber, main impeller, back backplate, decompression lid, sub-propeller, compresses the centrifugal charge pump that spring, seal ring, pump shaft, pump seat, axle sleeve, stuffing box, bearings, filtered water tank and stopcock etc. are formed.Its feature part is: the structure of pumping chamber, main impeller and suction chamber flow channels has good hydraulic characteristic and good matching.Flow losses are little, efficient height, the characteristics that the life-span is long; Floating type power combination sealing arrangement has good sealing effect and has guaranteed that mud do not miss, and pump shaft and corresponding part do not wear and tear.

Fig. 1, the utility model overall structure schematic representation.

Fig. 2, the utility model pumping chamber structural representation.

The left view of Fig. 3, the utility model main impeller.

Fig. 4, the utility model main impeller plan view.

Fig. 5, the utility model main impeller right elevation.

Fig. 6, the floating type dynamic seal mechanism structure of the utility model schematic representation.

Below in conjunction with description of drawings the utility model: be the 15-25 millimeter such as accompanying drawing 2 main impeller outer rims to the radial distance of the cut water of pumping chamber. The cut water base circle diameter (BCD) is 1.15-1.17 times of main impeller diameter. The pumping chamber internal chamber wall is volute, and the pumping chamber with this architectural feature has fully satisfied the flow behavior of mud, has reduced radial load, has improved the anti-wear performance of pumping chamber, has improved the service life of pump.

Such as accompanying drawing 1, main impeller 4 of the present utility model and is sleeved on the front end of pump shaft 20 in pumping chamber 1, between suction chamber 2 and the rear backplate 3. Such as Fig. 3,4,5, primary blades 21 on the main impeller 4 (both had been made of front and back two cambered surfaces for the palintrope semi-open type, the curvature of its front arc is greater than rear arc, two cambered surfaces slope inwardly respectively, the one end intersects by the place, axle center, front arc outer end and main impeller wheel rim boundary line are tangent), primary blades is radially uniform, and the number of blade is the 3-7 sheet. Its planform is formed by solid-liquid two-phase medium Theory of Three-dimensional Flowing designing and calculating, and it is suitable to bicker to have, and width of blade is the 40-45 millimeter, and the vane thickness thickness is the 30-50 millimeter, and it has good through-flow and anti-wear performance. There is the back blades 22 of 8～12 radial equipartitions at the back side of main impeller. Adopt the pumping chamber of the main impeller cooperation corresponding construction of said structure, reduce suffered axial force and the radial load of main impeller. Pump efficiency is improved and guarantee to pour into pump characteristics the ostrich peak not occur, reduce the fluctuation of three cylinder pump suction pressure to the impact of charge pump service behaviour. Utilize solid-liquid two The main impeller that the phase medium Theory of Three-dimensional Flowing designs is reduced to minimum to the flow losses in the runner, is conducive to contain the conveying of the drilling mud of solid phase particles, and the back blades at the main impeller back side can reduce the fluid pressure at place, rear backplate 3 axle center.

As accompanying drawing 1 and accompanying drawing 6, what the utility model adopted is floating type power combination sealing mechanism.Sub-propeller 6 is connected with axle sleeve 8 on being arranged on pump shaft 20 by key, and can slide vertically.The spring 7 that compresses with certain extruding force is arranged between sub-propeller 6 and axle sleeve 8 interior edge faces, and sub-propeller 6 is equipped with metallic packing ring 11,12 with the joint of back backplate 3 paraxial heart opposite positions.This mechanism is positioned at decompression and cover 5 chamber, is full of clear water in its chamber, stuffing box 10 be positioned over reduce pressure cover 5 and axle sleeve 9 between.What stuffing box adopted is general immersion oil asbestos packing, and stuffing box is compressed by Gland 13.When pump turns round, sub-propeller 6 and main impeller 4 revolve with speed, the axial force extrusion spring 7 of its generation, make sub-propeller 6 to direction motion away from main impeller, two metallic packing rings 11,12 no longer contact, at this moment the clear water pressure in the sub-propeller 6 place cavitys is in the connection and the equal measurement of the pressure of mud in the pumping chamber of the sub-propeller 6 and the back backplate 3 paraxial hearts, " propped up " like this mud in the decompression lid with stuffing box enter the sealing when having guaranteed to turn round.When termination of pumping, because the axial force that sub-propeller 6 is produced disappears, compressing spring 7 props up sub-propeller again and makes it to main impeller direction motion and make 11,12 contacts of two metallic packing rings, guaranteed the sealing under the situation of termination of pumping, the additional of clear water is to be provided by the filtered water tank 17 that is installed in outside the chamber by pipeline in the decompression lid, and the magnitude of recruitment of clear water is controlled by the aperture of stopcock 16.

The embodiment of the utility model: a kind ofly being used to carry the centrifugal charge pump that contains the solid phase particles drilling mud, is to adopt the structural type and the annexation of above-mentioned each assembly to be assembled.Mainly cover 5, sub-propeller 6, compress spring 7, pump shaft 20,

axle sleeve

8,9, stuffing box 10, seal ring 11,12, bearings 18 and pump seat 14 etc. and form by pumping chamber 1, suction chamber 2, main impeller 4, back backplate 3, decompression, suction chamber 2 is connected with pumping chamber 1 by bolt, pumping chamber 1 is connected with pump seat 14 by bolt, the main impeller 4 that is positioned at pumping chamber 1 is contained in the front end of pump shaft 20 by acorn nut, and back backplate 3 covers 5 with pump seat 14 and decompression and is connected.Sub-propeller 6 is contained in to reduce pressure to cover in 5 and by key and is connected with axle sleeve 8, axle sleeve 8 is sleeved on the pump shaft 20 by key, compressing spring 7 is sleeved between the interior edge face of sub-propeller 6 roots and axle sleeve 8, axle sleeve 9 is sleeved on the pump shaft 20, itself and decompression are equipped with stuffing box 10 between covering 5, and the bearings 18 that pump shaft 20 is made up of forward and backward bearing is supported.This bearings has also guaranteed the gap between main impeller 4 and the back backplate 3.When the centrifugal charge pump of present embodiment is worked, owing to the rotation of main impeller produces centrifugal action, main impeller 4 centers form low pressure area, when the mud that contains solid phase particles constantly is inhaled into the pump housing by suction chamber and radially outwards flows under the effect of main impeller, the kinetic energy major part that obtains converts the pressure energy to, and realizes the perfusion of drilling mud with certain pressure.The clear water pressure balance that produces with the coaxial sub-propellers 6 that rotate with speed of main impeller 4 mud pressure at main impeller and back shroud root place reach the purpose that stops mud to enter sealed letter.

In sum, the structural type of employing shown in accompanying

drawing

1,2,3,4,5,6, pumping chamber, main impeller, floating type power combination sealing mechanism by the design of solid, liquid two-phase medium Theory of Three-dimensional Flowing are the centrifugal charge pump of major character, have rational in infrastructure, performance is good, the pump efficiency height, and sealing is reliable, long service life, characteristics such as quick detachable and easy to maintenance.Floating type power combination sealing mechanism is compared with existing charge pump, and sealing effect strengthens.Can effectively prevent the leakage of mud, and have running reliably, with the characteristics of changing stuffing box, guarantee the long-term use of charge pump hardly.Satisfy and departing from declared working condition, particularly under the condition that proportion changes, carry the needs that contain the solid phase particles drilling mud.Be complementary with 3NB series rig, improved the suction condition of drilling pump, guaranteed its work stable under specified strokes per minute.Charge pump with the contained floating type power combination sealing system of this structure, particularly the utility model also can be as the sand pump of oilfield mud solid control equipment and chemical industry, papermaking, light industry transh pump.

Claims

1, a kind of centrifugal charge pump, mainly by pumping chamber, suction chamber, back backplate, main impeller, the underpressure chamber, stuffing box, seal ring, pump seat, bearing, pump shaft constitutes, it is characterized in that: suction chamber 2 is connected with pumping chamber 1 by bolt, pumping chamber 1 is connected with pump seat 14 by bolt, main impeller 4 is positioned at pumping chamber 1 and is sleeved on the front end of pump shaft 20, back backplate 3 covers 5 with pump seat 14 and decompression and is connected, sub-propeller 6 is arranged on to reduce pressure to cover in 5 and by key and is connected with axle sleeve 8, axle sleeve 8 is sleeved on the pump shaft 20 by key, compressing spring 7 is sleeved between sub-propeller 6 roots and axle sleeve 8 interior edge faces, axle sleeve 9 is sleeved on the pump shaft 20 itself and decompression and stuffing box 10 is housed between covering 5, and pump shaft 20 is in by preceding, on the bearings that rear bearing 18 is formed; Wherein:

The outer rim of main impeller 4 is 15～25 millimeters to the radial distance of the cut water of pumping chamber 1, and the cut water base circle diameter (BCD) is 1.15～1.17 times of main impeller 4 diameters;

The primary blades 21 of main impeller 4 is the palintrope semi-open type, promptly is made of front and back two cambered surfaces, and the curvature of its front arc slopes inwardly respectively greater than rear arc two cambered surfaces, and it intersects by the place, axle center, and front arc outer end and main impeller wheel rim boundary line are tangent, and primary blades 21 is radially uniform; The another side of main impeller is a back blades 22, and back blades 22 is radially uniform;

To be sub-propeller 6 be connected with axle sleeve 8 on being arranged on pump shaft 20 by key floating type power combination sealing mechanism, and can slide vertically, compressing spring 7 is arranged between sub-propeller 6 and axle sleeve 8 interior edge faces, sub-propeller 6 is equipped with metallic packing ring 11,12 with the joint of back backplate 3 paraxial heart opposite positions, entire mechanism is arranged on decompression and covers in 5 the chamber, be full of clear water in its chamber, stuffing box be positioned over decompression cover 5 and axle sleeve 9 between and compress by gland 13.

2, centrifugal charge pump according to claim 1 is characterized in that: the primary blades 21 on the main impeller 4 is 3～7, and its width is that 40～45 millimeters, thickness are 30～50 millimeters, and back blades 22 is 8～12.