CN209638005U - Double-casing axially split type super-pressure coke cutting water pump - Google Patents

Abstract

A kind of Double-casing axially split type super-pressure coke cutting water pump, including pump barrel body (4), inner housing (5), pump suction chamber (6), shaft (7), impeller at different levels, the inner housing (5) is made of for axial subdivision mode upper housing (51), lower case (52), has several spaced discharge runners (54) and impeller suction chamber (53) in the inner housing；It is arranged symmetrically between the rear impeller sets that the first stage impeller, the secondary impeller preceding impeller sets constituted and impeller, secondary impeller are constituted in mutually opposing, is equipped with middle transition runner (55) in the inner housing and in the side edge of the last one secondary impeller of preceding impeller sets and rear impeller sets.The axial force that the utility model impeller generates can be balanced voluntarily, without balance leakage, improved the efficiency of pump, generated super-pressure, and be convenient for the casting of upper and lower casing, convenient for installation and maintenance, stable and reliable operation has significant energy-saving effect.

Description

Double-casing axially split type super-pressure coke cutting water pump

Technical field

The present invention relates to a kind of centrifugal multistage pump multiple centrifugal pump, it is specifically related to what its inner housing of one kind was arranged symmetrically using axial subdivision Double-casing multistage centrifugal coke cutting water pump.

Background technique

Currently used centrifugal multistage pump multiple centrifugal pump is Double-casing radially split type (abbreviation BB5), mono-hull radially split type (abbreviation BB4), three kinds of structures of mono-hull axially split type (abbreviation BB3).

Double-casing formula centrifugal multistage pump multiple centrifugal pump (BB5) is using radial subdivision guide-vane, and pump core rotor, impeller are using unidirectional The double shell ultrahigh pressure multistage centrifugal pump of arranged in series.The unidirectional axial thrust superposition value that multiple impellers generate, it is necessary to be arranged one A axial force balance mechanism and thrust bearing part are balanced and are born, and the design of this axial force balance mechanism, processing, assembly Precision is high, it is desirable that maintenance technique level is also relatively high, maintenance trouble；In addition, due to operating condition frequent starting and change or Due to operation etc., axial force balance mechanism and thrust bearing grinding phenomenon are often occurred, and there are hidden dangers.

Mono-hull formula centrifugal multistage pump multiple centrifugal pump (BB4), the above hidden danger of presence as Double-casing multi-stage centrifugal pump are asked Outlying；There is also needing to assemble and disassemble sucking and discharge pipeline when assembly and disassembly pump component, working service is more troublesome.Since sectional type is centrifuged The accuracy of manufacture of the structure that pump is matched equipped with sectional multistage guide vane, middle section, each component is high, processing difficulties；When assembly, segment The dynamic and static error that formula multistage guide vane is generated with middle section many places fit clearance is difficult to eliminate, affect pump core overall structure rigidity and The reliability of unit；When the assembly and disassembly that especially pump, maintenance, impeller, guide vane, middle section in pump core etc. are dismantled step by step, Cai Nengjin Row maintenance.The precision of former rotor dynamic balancing can be lost in this way, and maintenance is expensive, maintenance time is long, influences to operate economic effect Benefit.

There are also a kind of not multi-purpose mono-hull axially split type centrifugal multistage pump multiple centrifugal pumps (BB3) to be used for coking system, due to by state The restriction of the limitation of border normal service conditions and domestic manufacture level is generally being in the field sub-high pressure (10MPa or so) using pressure It closes, much can not meet the requirement of super-pressure.

Summary of the invention

It is an object of the invention to overcome above-mentioned technical deficiency, and provide that a kind of maintenance is easy, failure rate is low, efficient section Can Double-casing axially split type super-pressure coke cutting water pump, cut burnt needs with meet oil refining and coal chemical industry coking system.

The purpose of the present invention is realized by following technical solution: Double-casing axially split type super-pressure coke cutting water pump, packet Include pump end cap, pump barrel body, inner housing, pump suction chamber, shaft, first stage impeller, secondary impeller, impeller, mechanical sealing parts, Parts of bearings, the inner housing are made of for axial subdivision mode upper housing, lower case, have several in the inner housing Every the discharge runner and impeller suction chamber of setting, the discharge runner is the symmetric space runner of double volute casings and straight-through impeller sucks Room；It is between the rear impeller sets that the first stage impeller, the secondary impeller preceding impeller sets constituted and impeller, secondary impeller are constituted Mutually opposing is arranged symmetrically, in the inner housing and in the last one secondary impeller of preceding impeller sets and rear impeller sets Side edge is equipped with middle transition runner.

The pump suction chamber is mounted in upper housing, lower casing by suction chamber stud, suction chamber nut for mode is separately provided The front end of the suction side of body, the pump suction chamber is connected equipped with positioning pin with sucking letter body.The pump end cap, is spat inner housing Counter balance pocket is formed between outlet mechanical sealing parts, is equipped with the balance channel communicated with the counter balance pocket in the pump end cap, and The external balance pipe being connected with balance channel on the pump end cap, the suction inlet phase of the other end and pump barrel body of the balance pipe It connects.Impeller hub sealing ring is respectively arranged between the first stage impeller, secondary impeller and inner housing, in the impeller hub sealing ring Side edge be cased with casing ring seat.Cut water is equipped at the interior throat two sides of the casing ring seat, at the cut water In in impeller suction chamber.

The beneficial effect of the technical solution adopted in the present invention is:

1, multi-stage impeller is used symmetrical and is arranged back-to-back, and the axial force that each impeller generates voluntarily balances；Without axis is arranged The efficiency of pump is improved without balance leakage to dynamic balance mechanism, this balance mechanism is also reduced and is possible to generate failure Point.Inner housing is identical due to its upper and lower casing shape, and radial force is able to complete equipilibrium.

2, pump suction chamber puts together on the suction side of upper and lower casing (scroll casing shape) using individually designed manufacture, thus may be used To simplify inner shell structure.Since upper and lower casing reaches same shape, convenient for the casting of upper and lower casing；Pump suction chamber is conjunction Also make upper and lower casing conjugation higher in interior shell end, wherein the sealing for opening face is more effective.

3, inner housing (pump core) is opening structure in level, and pump only need to be by shell spiral shells several on the upper housing of inner housing when overhauling Bolt removes, and can pull out entire rotor part, be overhauled.After rotor part overall package high-speed balancing, do not need to tear open The part on rotor part is unloaded, can be directly placed into lower case, reassembles upper housing, guarantees dynamic balance accuracy, it is time saving and can It leans on.

4, since scroll casing type inner shell structure is space runner, keeps the high efficient district of pump wide without guide vane, there is significant energy conservation Effect.The offset reduced sensitivity that scroll casing type impeller of pump spues to volute casing center, the stable operation favorably pumped.Scroll casing type pump allows There is biggish diversion angle gap, pump operation is made to reduce pressure fluctuation, stable and reliable operation in non-design discharge.

With the raising of machine casting industry manufacture level and ability, for the present invention from angle is used, inner housing is impeller pair Claim the Double-casing multistage super-pressure centrifugal pump (abbreviation BB5+) of the horizonally split volute-chamber structure of (back-to-back) arrangement deep by refinery, electricity The welcome and recommendation of the industry customers such as power, metallurgy is selected.It is more suitable for the coke cutting water pump of coking plant, the height of urea plant The conjunction of the high-voltage fields such as hydraulic fluid ammonia pump and the Large-scale High-Pressure boiler feed pump of power industry, high pressure dephosphorization is used.

Detailed description of the invention

With reference to the accompanying drawing and embodiment the present invention is described in further detail.

Fig. 1 is the structural diagram of the present invention (impeller is for eight grades).

Fig. 2 is the A direction view of Fig. 1.

Fig. 3 is the structural schematic diagram of the pump suction chamber (being separately provided) in Fig. 1.

Fig. 4 is the structural schematic diagram of the casing ring seat (being equipped with cut water) in Fig. 1.

Specific embodiment

Referring to figs. 1 to Fig. 3 it is found that Double-casing axially split type super-pressure coke cutting water of the present invention pump (Pmax=40MPa), packet Include pump end cap 1 (and primary seal pad 2, sealing wound gasket 3, main stud 15, main nut 16, main washer 17), pump barrel body 4, inner housing 5 (i.e. pump core), pump suction chamber 6, shaft 7, first stage impeller 8, secondary impeller 9 (several grades), impeller 10, mechanical sealing parts (including discharge end mechanical sealing parts 13, suction side mechanical sealing parts 18), parts of bearings (including discharge end bearing component 14, suction side parts of bearings 19) and the composition such as interstage bushing 11, intermediate axle sleeve 23, nockbush 12, restrictor sleeve 26, institute It states shaft 7, first stage impeller 8, secondary impeller 9, impeller 10 and constitutes rotor part, the inner housing 5 is that axial subdivision is (horizontal Subdivision) mode and be made of upper housing 51, lower case 52 (it is split centered on the two, form cylindrical shape inner casing by combination Body), the inner housing 5 is interior to have several spaced discharge runners 54 (use of discharge liquid) and impeller suction chamber 53, institute It states the symmetric space runner that discharge runner 54 is double volute casings and leads directly to (next) impeller suction chamber 53；It is the first stage impeller, secondary The rear impeller sets (rear level Four impeller) of preceding impeller sets (preceding level Four impeller) and impeller, secondary impeller composition that grade impeller is constituted Between in mutually opposing be arranged symmetrically (i.e. back-to-back mode, longitudinal direction), in the inner housing 5 and preceding impeller sets most The side edge of the latter secondary impeller and rear impeller sets is equipped with middle transition runner 55.The pump suction chamber 6 is the side of being separately provided Formula and by suction chamber stud 30, suction chamber nut 31 mounted in upper housing 51, lower case 52 suction side, the pump suction chamber 6 Front end is connected equipped with positioning pin 32 with sucking letter body 38.

The present invention by by flat key 22 in the slot of shaft 7, it is intermediate axle sleeve 23 is sliding in shaft 7, then by flat key 22 and snap ring 24 mounted in shaft 7 slot in, then successively by first stage impeller 8, several secondary impellers 9, impeller 10 heating dress In shaft 7, cooperate tightening with flat key 22, by 11 sets of interstage bushing in intermediate axle sleeve 23 and intermediate two secondary impeller (frontal lobes The last one secondary impeller of wheel group and first secondary impeller of rear impeller sets) wheel hub, then the first stage impeller 8, It is respectively arranged with impeller hub sealing ring 45 between secondary impeller 9 and inner housing 5, is cased in the side edge of the impeller hub sealing ring 45 Casing ring seat 25 (except impeller suction chamber).Load onto secondary impeller and impeller hub sealing step by step with same method Ring, until loading onto all impellers (in addition to impeller) and putting on corresponding impeller hub sealing ring.Flat key on each impeller It is rotating torque in shaft to be sent to each impeller, snap ring 24 is to prevent each impeller axial motion.In the another of the inner housing Restrictor sleeve 26 is loaded between end and shaft puts on nockbush 12 outside again.

It is so that the axial force of pump is voluntarily balanced, In in being arranged symmetrically back-to-back since each impeller is mounted in shaft Installation axial force balance mechanism is no longer needed on rotor part, it will not be due to equipped with the balance mechanism component minimum end clearance The failure that may cause；Simultaneously also without balance leakage caused by the balance mechanism, to improve the volumetric efficiency of pump.Inner casing The upper and lower casing of body is that the plane of two half shells cooperation is metal covering to metal face contact, is positioned with shell taper bolt 29, and By shell stud 27 and case nut 28 reaching inner casing under 4 annular room high pressure liquid pressure collective effect of clamp force and pump barrel body The sealing of body.

After rotor part after assembling makees dynamic balancing qualification, it can not have to dismantle related zero installed on rotor part again Part can be directly placed into ready lower case, not only ensure that dynamic balance accuracy in this way, but also time saving reliable.Check rotor part After easily not suppressing strength when rotating on the upper housing of inner housing 5, then the other half upper housing is closed, makes open plane in two half shells In conjunction with shell stud 27 and case nut 28 by whole inner housing 5 the fastening force for tightly reaching requirement, when rotating rotor part After easily not suppressing strength, positioning stamps shell taper bolt 29 with conical bore on brill；Pump suction chamber 6 is mounted in upper and lower casing (pump core) Suction side become the entirety of pump core flow passage components with sucking stud 30, sucking nut 31 tight；Pump suction chamber 6 is independent Setting is upper and lower casing structure can be made to simplify, while can also play and reinforce upper and lower casing fastness, and it is close to open face in reinforcing Feng Xing；Because the front end of the pump suction chamber 6 is equipped with positioning pin 32, wound gasket 33 and shell " O " are loaded on inner housing suction side The inner housing of assembling is packed into pump barrel body 4, makes each stop portion precision-fit, be directed at the water inlet of pump suction chamber by shape circle 34 The suction inlet of pump barrel body installs the primary seal pad 2 and sealing wound gasket 3 of pump 1 front end of end cap, will install the inner housing of rotor part And pump suction chamber is packed into together in pump barrel body 4, makes each stop portion precision-fit, makes to seal wound gasket 3 and inner housing seam allowance cooperates, The primary seal pad 2 and 4 seam allowance of pump barrel body pumped on end cap 1 simultaneously cooperates.Kingbolt 15, main nut 16, main washer 17 will pump end cap 1 The fastening force for reaching requirement is compressed with pump barrel body 4.Make sealing wound gasket 3, primary seal pad 2 that can seal, to prevent from pumping The leakage of internal highly pressurised liquid.Wherein sealing wound gasket 3 also acts as inner housing because of the temperature difference while playing prevents liquid leakage Cause the compensation function expanded with heat and contract with cold.Cooperate by discharge end mechanical sealing parts 13 in the shaft 7 and with pump end cap 1, with spitting Stud 34 is sealed out, discharge sealing nut 35 fastens.Discharge end bearing component 14 is mounted in shaft 7 and the mechanical seal of discharge end Component cooperation is fastened with discharge bearing stud 36, discharge bearing nut 37.Sucking letter body 38 is loaded into sucking round section joint ring 39, is used Sucking stud 40, sucking nut 41 are fastened on pump barrel body 4, make to make interior in dowel hole alignment pump suction chamber 6 and positioning pin 32 Shell (pump core) component is from twisting resistance caused by hydraulic shock and issuable mechanical part.Suction side mechanical sealing parts 18, suction side parts of bearings 19 plays the whole rotor part weight of bearing and energy flexible rotating, discharge end, suction side mechanical seal Component plays the role of sealing liquid, prevents conveying liquid from axially leaking outside.The pump end cap 1, inner housing 5, discharge terminal tool are close It seals and forms counter balance pocket 56 between component 13, equipped with the balance channel 57 communicated with the counter balance pocket 56 in the pump end cap 1, and The external balance pipe 58 being connected with balance channel 57 on the pump end cap 1, the sucking of the other end and pump barrel body 4 of the balance pipe 58 Mouth connects.

Each impeller of rotor part is located in the inner housing of horizonally split, and volute casing designs and produces into double worm type, and is phase To, be arranged symmetrically, the radial force that each impeller generates in pump in this way is able to autobalance；The design and manufacture of this spiral case type water pump have larger Diversion angle gap, so that pump operation unstability and the pulsation that reduces pressure in non-design discharge operating condition is improved.Such as Fig. 4 institute Show, be equipped with cut water 44 (being arranged symmetrically) at the interior throat two sides of the casing ring seat 25, which is in impeller In suction chamber 53, the erosion of highly pressurised liquid can be reduced in this way, and mitigate the influence of abrasion damage.Since inner housing is spatial flow Road is arranged without guide vane, widens the high efficient district of pump, this is with significant energy-saving effect；This impeller of pump center is disconnected to volute casing runner The offset sensibility at face center is lower, pumps more stable operation with benefit；It is equipped on the interstage bushing 11 and nockbush 12 anti- Helicla flute is leaked between grade with reducing, improves the volumetric efficiency of pump.

When pumping maintenance, by suction side parts of bearings 19 and suction side mechanical sealing parts 18, sucking letter body 28 together from It is extracted out in pump barrel body 4, removes pump suction chamber 6, sucking stud 30, sucking nut 31；Remove the shell stud conjunction upper and lower casing 27, case nut 28 and taper bolt 29 is removed, inner housing 5 can therefrom open face and separate, to each impeller and leaf of rotor part Wheel hub seal ring, casing ring seat, interstage bushing, nockbush (i.e. release bushing) and inner housing etc. are overhauled, no Impellers at different levels are removed must step by step, the precision of original rotor dynamic balancing can not be destroyed in this way, after maintenance, rotor part is mounted in inner casing In body 5, make each impeller hub sealing ring, casing ring seat and pump housing bushing back on origin-location, then by upper housing with The alignment of another semi spiral case, makes each cooperation face contact, loads onto taper bolt 29, with shell stud 27, case nut 28 tightly reaching tight Gu power；Pump suction chamber 6 is loaded onto, with sucking stud 30, sucking nut 31 tightly, the inner housing 5 of assembling and pump end cap 1 are filled together Enter in pump barrel body 4, so that the water sucking mouth of pump suction chamber 6 is directed at pump barrel body suction inlet, by suction line to good.With main nut 16 and main pad Circle 17 makes primary seal pad 2, sealing wound gasket 3 play sealing function by pump end cap 1 and pump barrel body 4 tightly fastening force is reached. By suction side sucking letter body 38 tightly on 4 end face of pump barrel body, being loaded on suction side mechanical sealing parts 18, suction side bearing portion Part 19, with bearing stud 42, bearing nut 43 tight.When rotating rotor part, until light, flexible to rotor part rotation. In this way, maintenance is substantially shorter the time, original precision is not lost, the use of client is facilitated.

The working principle of super-pressure coke cutting water of the present invention pump are as follows: the hydraulic part of upper and lower casing be it is identical, it is upper, The casting of lower case is identical.Transported liquid enters the suction inlet of pump barrel body, pump suction chamber with given pressure, Due to rotating each impeller (first stage impeller 8, secondary impeller 9, impeller 10) energy transmission to transported liquid, make liquid Kinetic energy and potential energy increase, into the spiral dual channel volute casing of inner housing, part kinetic energy is transformed into potential energy again.In inner housing Interior, during which each discharge runner passes through middle transition runner 55 again the impeller suction chamber of guiding fluid next stage impeller, this Sample level-one is repeated continuously this process to next stage, and every level liquid increases identical pressure head, as single-stage pressure head (lift), Afterbody (final stage) the discharge runner liquid for flowing through inner housing enters the annular room between inner housing 5 and pump barrel body 4, liquid Discharge opening through pump barrel body finally enters discharge line, provides super-pressure liquid stream.

Claims (5)

1. Double-casing axially split type super-pressure coke cutting water pumps, including pump end cap (1), pump barrel body (4), inner housing (5), pump sucking Room (6), shaft (7), first stage impeller (8), secondary impeller (9), impeller (10), mechanical sealing parts, parts of bearings, it is special Sign is: the inner housing (5) is made of for axial subdivision mode upper housing (51), lower case (52), in the inner housing (5) With several spaced discharge runners (54) and impeller suction chamber (53), the discharge runner (54) is pair of double volute casings Claim space runner and leads directly to impeller suction chamber (53)；The first stage impeller, the preceding impeller sets of secondary impeller composition and impeller, It is arranged symmetrically between the rear impeller sets that secondary impeller is constituted in mutually opposing, in the inner housing (5) and in preceding impeller sets The last one secondary impeller and rear impeller sets side edge be equipped with middle transition runner (55).

2. Double-casing axially split type super-pressure coke cutting water pump as described in claim 1, it is characterised in that: the pump suction chamber (6) upper housing (51), lower case (52) are mounted in by suction chamber stud (30), suction chamber nut (31) for mode is separately provided Suction side, the front end of the pump suction chamber (6) is connected equipped with positioning pin (32) with sucking letter body (38).

3. Double-casing axially split type super-pressure coke cutting water pump as claimed in claim 1 or 2, it is characterised in that: the pump end It covers (1), inner housing (5), form counter balance pocket (56) between discharge end mechanical sealing parts (13), set the pump end cap (1) is interior There is a balance channel (57) communicated with the counter balance pocket (56), and external on the pump end cap (1) is connected with balance channel (57) The other end of balance pipe (58), the balance pipe (58) connects with the suction inlet of pump barrel body (4).

4. Double-casing axially split type super-pressure coke cutting water pump as claimed in claim 1 or 2, it is characterised in that: in the head Impeller hub sealing ring (45) are respectively arranged between grade impeller (8), secondary impeller (9) and inner housing (5), are sealed in the impeller hub The side edge of ring (45) is cased with casing ring seat (25).

5. Double-casing axially split type super-pressure coke cutting water pump as claimed in claim 4, it is characterised in that: close in the pump housing Cut water (44) are equipped at the interior throat two sides of seal ring seat (25), which is in impeller suction chamber (53).