CN102758791A

CN102758791A - Centrifugal pump with high suction pressure

Info

Publication number: CN102758791A
Application number: CN2012102100293A
Authority: CN
Inventors: 栾凤英; 张丽荣; 王海明
Original assignee: DANAI PUMPS Co Ltd
Current assignee: DANAI PUMPS Co Ltd
Priority date: 2012-06-25
Filing date: 2012-06-25
Publication date: 2012-10-31

Abstract

The invention discloses a centrifugal pump with high suction pressure. The centrifugal pump comprises a pump body, a pump body wear ring, an impeller, a pump cover, a cooling water cavity, a shaft, a first bearing gland, a bearing bracket, a cylindrical roller bearing, a cooling water jacket, a conical roller bearing, a first baffling plate, a second bearing gland, an oil slinger, a second baffling plate, an oil chamber, a shaft sleeve, a flange and an impeller wear ring. According to the centrifugal pump with high suction pressure, the pump body adopts an efficient volute design, and when the pump body is higher than 80mm, dual volutes are adopted so as to reduce the unbalanced radial force generated under off-designed points; the pump body is provided with centrally-supported pump support feet, force on a pipeline is uniformly delivered to a foundation through the pump support feet, and therefore the influence on force and deformation of the pump is reduced; and the pump body adopts a positioning pin structure, the influence caused by thermal deformation generated by a pump casing is sufficiently considered at high temperature and high pressure, and therefore the pump can be prevented from skewing laterally.

Description

High suction pressure centrifugal pump

Technical field

The present invention relates to a kind of high suction pressure centrifugal pump.

Background technique

In petrochemical equipment, often have the medium of high temperature and high saturated vapor pressure, boiler water etc. for example, the general temperature of these media is higher; Between 260 ℃-370 ℃, saturated vapor pressure is bigger, reaches more than the 5MPa; For the conveying of these media has enough pressure to keep the form of liquid with regard to needing medium, this has just produced series of requirements to the pump of fed sheet of a media, at present; The bright rare domestic manufacturer of this kind pump type that can bear inlet pressure like this produces, and the one, the axial force of pump is very big, makes bearing life lower; Domestic manufacturer is difficult to reach usage requirement, and the 2nd, sealing load is high, and the seal leakage amount is big; Sealing life is low, the problem that the solution sealing that domestic manufacturer can't be perfect is used.

Summary of the invention

The purpose of this invention is to provide a kind of high suction pressure centrifugal pump.

The present invention for realizing the technological scheme that above-mentioned purpose adopted is: a kind of high suction pressure centrifugal pump, comprise the pump housing, pump housing choma, impeller, pump cover, cooling water chamber, axle, clutch shaft bearing gland, bearing bracket, roller bearing, cooling jacket, tapered roller bearing, the first baffling dish, second bearing gland, disc, the second baffling dish, grease chamber, axle sleeve, flange and impeller port ring, and the said pump housing is connected with pump cover; Pump housing choma is fixed on the pump housing, and impeller port ring is fixed on the impeller eye place, and row's raffinate mouth of the pump housing connects through flange; Impeller is fixed on the axle through steel-wire screw-socket and impeller nut; Axle sleeve adopts Spielpassung to be fixed on the axle, and pump cover is connected with bearing bracket, forms cooling water chamber between pump cover and the bearing bracket; Roller bearing is a fore bearing; Tapered roller bearing is a rear bearing, and cooling jacket is installed in the rear portion of bearing bracket, and the clutch shaft bearing gland is arranged on the roller bearing; Second bearing gland is arranged on the tapered roller bearing; The first baffling dish and the second baffling dish are separately positioned on second bearing gland and the clutch shaft bearing gland, and disc is placed on the axle, and the grease chamber is arranged between bearing bracket and the axle; Be provided with permanent position oil ring in the grease chamber, be provided with outside the grease chamber and look oily window.

Adopt compressible metal wrap style first gasket seal between the said pump housing and the pump cover.

Adopt second gasket seal between the wheel hub of said axle sleeve and impeller.

Adopt the 3rd gasket seal between said impeller and the impeller nut.

Said pump cover and bearing bracket radially with axially all adopt first seal with O ring.

Adopt second seal with O ring between said bearing bracket and the cooling jacket.

Form waterway between said bearing bracket and the cooling jacket.

Clutch shaft bearing back-up ring, second end ring and clutch shaft bearing gland, second bearing gland location are adopted in the outer ring of said roller bearing, tapered roller bearing.

Said tapered roller bearing inner ring adopts ring and locking nut to fix.

The said clutch shaft bearing gland and second bearing gland adopt labyrinth sealing.

A kind of high suction pressure centrifugal pump of the present invention, the pump housing adopt efficient volute design, surpass the uneven radial force of employing double volute to reduce to produce under the off-design point of 80mm; The pump housing is designed with the pump leg of intermediate support, and the power on the pipeline is passed to the basis equably through the pump leg, reduces the influence to the pump stress deformation; The pump housing adopts locating pin structure, takes into full account the influence that thermal distortion caused that pump case produces during HTHP, prevents that pump side is to skew; The pump cover seal chamber designs according to the API610 standard, strengthens cavity size, improves the flushing environment, can be equipped with various integrated mechanical sealings of API682 and encapsulation scheme, to satisfy harsh service condition; The impeller back side is totally-enclosed cover plate structure; Be not with equalizing orifice or back blade; Power so that back shroud bears is offset the axial force that a part of high suction pressure produces on impeller; The axial force that impeller produces is transmitted in the design of major diameter stiff shaft, and first critical number of revolution are all greater than 120% of the actual revolution of pump, and the rotating speed of pump can be adapted to 50HZ and 60HZ frequency; Remaining radial force and axial force are born in the roller bearing combination that the tapered roller bearing of installing face-to-face separates with the outer ring; The cooling jacket structure is adopted in the bearing bracket design, is fit to the operation of bearing high loading and hot environment, fully reduces the running temperature of bearing, makes bearing under exacting terms, run well.

Description of drawings

Fig. 1 is the structural representation of a kind of high suction pressure centrifugal pump of the present invention.

Among the figure: 1, the pump housing; 2, pump housing choma; 3, impeller; 4, first pad; 5, pump cover; 6, cooling water chamber; 7, axle; 8, clutch shaft bearing gland; 9, bearing bracket; 10, roller bearing; 11, clutch shaft bearing back-up ring; 12, the 2nd O type circle; 13, second end ring; 14, cooling jacket; 15, waterway; 16, tapered roller bearing; 17, the first baffling dish; 18, second bearing gland; 19, locking nut; 20, ring; 21, disc; 22, grease chamber; 23, a permanent oil ring; 24, look oily window; 25, the second baffling dish; 26, mechanical seal; 27, an O type circle; 28, axle sleeve; 29, second pad; 30, the 3rd pad; 31, locating pin structure; 32, steel-wire screw-socket; 33, impeller nut; 34, flange; 35, impeller port ring.

Embodiment

As shown in Figure 1, high suction pressure centrifugal pump comprises the pump housing 1, pump housing choma 2, impeller 3, pump cover 5, cooling water chamber 6, axle 7, clutch shaft bearing gland 8, bearing bracket 9, roller bearing 10, cooling jacket 14, tapered roller bearing 16, the first baffling dish 17, second bearing gland 18, disc 21, the second baffling dish 25, grease chamber 22, permanent position oil ring 23, looks oily window 24, axle sleeve 28, flange 34 and impeller port ring 35 etc., and the pump housing 1 connects with pump cover 5, adopts compressible metal wrap style first pad 4 to seal; Removable impeller port ring 35 is fixed on impeller 3 ingress, and removable pump housing choma 2 is fixed on the pump housing 1, but balancing axial thrust when protecting zone easy to wear, and the general inlet pressure of this pump is bigger; So the axial force direction is pointed to motor, so impeller 3 is not with equalizing orifice and back choma, the pump housing adopts locating pin structure 31, takes into full account the influence that thermal distortion caused that pump case produces during HTHP; Prevent pump side to skew, pump housing row raffinate mouth adopts flange 34 to connect, and is fit to high temperature and high pressure condition, and impeller 3 is by steel-wire screw-socket 32 and impeller nut 33 firm being fixed on the axle 7; Axle sleeve 28 adopts Spielpassung to be fixed on the axle 7, and adopts 29 sealings of second pad between the wheel hub of impeller 3, also adopts 30 sealings of the 3rd pad between impeller 3 and the impeller nut 33, and axle 7 is isolated fully with the medium of being carried; Pump cover 5 connects with bearing bracket 9, radially seals with axially all adopting an O type circle 26, and the cooling water chamber 6 that forms between the two can according to circumstances feed cooling water, for mechanical seal 27 provides protection; Seal chamber designs according to the API610 standard, can be equipped with various integrated mechanical sealings of API682 and encapsulation scheme, to satisfy harsh service condition, the cantilevered support structure of stiff shaft 7; First critical number of revolution are all greater than 120% of the actual revolution of pump, and the rotating speed of pump can be adapted to 50HZ and 60HZ frequency, bearing bracket 9 design General design, and tens specification pumps only need several kinds of bearing brackets; The roller bearing 10 that fore bearing adopts the outer ring to separate, rear bearing adopts the tapered roller bearing of installing face-to-face 16, bears remaining radial force and axial force, and cooling jacket 14 is equipped with at bearing bracket 9 rear portions; With 12 sealings of the 2nd O type circle, form the running temperature that waterway 15 can fully reduce bearing, forward and backward bearing roller bearing 10 adopts clutch shaft bearing back-up ring 11, second end ring 13 and clutch shaft bearing gland 8, second bearing gland, 18 location with tapered roller bearing 16 outer rings, and rear bearing tapered roller bearing inner ring adopts ring 20 fixing with locking nut 19; Clutch shaft bearing gland 8, second bearing gland 18 adopt labyrinth sealings, and the second baffling dish 25, the first baffling dish 17 prevent that external dust from polluting and the leakage of internal lubrication oil before and after cooperating, and disc 21 is placed on the axle 7; Rotate with axle 7, look oily oil level in the window 24 observation grease chambeies 22, permanent position lubricating cup 23 can change automatic make-up oil according to oil level, and the pump housing adopts efficient volute design; Surpass the uneven radial force of employing double volute to reduce to produce under the off-design point of 80mm, the pump housing is designed with the pump leg of intermediate support, and the power on the pipeline is passed to the basis equably through the pump leg, reduces the influence to the pump stress deformation; The pump housing adopts locating pin structure, takes into full account the influence that thermal distortion caused that pump case produces during HTHP, prevents pump side to skew, and the pump cover seal chamber designs according to the API610 standard; Strengthen cavity size, improve the flushing environment, can be equipped with various integrated mechanical sealings of API682 and encapsulation scheme, to satisfy harsh service condition; The impeller back side is totally-enclosed cover plate structure, is not with equalizing orifice or back blade, offsets the axial force that a part of high suction pressure produces with the power that back shroud bears on impeller, and the axial force that impeller produces is transmitted in the design of major diameter stiff shaft; First critical number of revolution are all greater than 120% of the actual revolution of pump, and the rotating speed of pump can be adapted to 50HZ and 60HZ frequency, and remaining radial force and axial force are born in the roller bearing combination that the tapered roller bearing of installing face-to-face separates with the outer ring; The cooling jacket structure is adopted in the bearing bracket design, is fit to the operation of bearing high loading and hot environment, fully reduces the running temperature of bearing, makes bearing under exacting terms, run well.

Claims

1. one kind high suction pressure centrifugal pump, it is characterized in that: comprise the pump housing, pump housing choma, impeller, pump cover, cooling water chamber, axle, clutch shaft bearing gland, bearing bracket, roller bearing, cooling jacket, tapered roller bearing, the first baffling dish, second bearing gland, disc, the second baffling dish, grease chamber, axle sleeve, flange and impeller port ring, the said pump housing is connected with pump cover; Pump housing choma is fixed on the pump housing, and impeller port ring is fixed on the impeller eye place, and row's raffinate mouth of the pump housing connects through flange; Impeller is fixed on the axle through steel-wire screw-socket and impeller nut; Axle sleeve adopts Spielpassung to be fixed on the axle, and pump cover is connected with bearing bracket, forms cooling water chamber between pump cover and the bearing bracket; Roller bearing is a fore bearing; Tapered roller bearing is a rear bearing, and cooling jacket is installed in the rear portion of bearing bracket, and the clutch shaft bearing gland is arranged on the roller bearing; Second bearing gland is arranged on the tapered roller bearing; The first baffling dish and the second baffling dish are separately positioned on second bearing gland and the clutch shaft bearing gland, and disc is placed on the axle, and the grease chamber is arranged between bearing bracket and the axle; Be provided with permanent position oil ring in the grease chamber, be provided with outside the grease chamber and look oily window.

2. a kind of high suction pressure centrifugal pump according to claim 1 is characterized in that: adopt compressible metal wrap style first gasket seal between the said pump housing and the pump cover.

3. a kind of high suction pressure centrifugal pump according to claim 1 is characterized in that: adopt second gasket seal between the wheel hub of said axle sleeve and impeller.

4. a kind of high suction pressure centrifugal pump according to claim 1 is characterized in that: adopt the 3rd gasket seal between said impeller and the impeller nut.

5. a kind of high suction pressure centrifugal pump according to claim 1 is characterized in that: said pump cover and bearing bracket radially with axially all adopt first seal with O ring.

6. a kind of high suction pressure centrifugal pump according to claim 1 is characterized in that: adopt second seal with O ring between said bearing bracket and the cooling jacket.

7. a kind of high suction pressure centrifugal pump according to claim 1 is characterized in that: form waterway between said bearing bracket and the cooling jacket.

8. a kind of high suction pressure centrifugal pump according to claim 1 is characterized in that: clutch shaft bearing back-up ring, second end ring and clutch shaft bearing gland, second bearing gland location are adopted in the outer ring of said roller bearing, tapered roller bearing.

9. a kind of high suction pressure centrifugal pump according to claim 1 is characterized in that: said tapered roller bearing inner ring adopts ring and locking nut to fix.

10. a kind of high suction pressure centrifugal pump according to claim 1 is characterized in that: the said clutch shaft bearing gland and second bearing gland adopt labyrinth sealing.