CN111946622A - Multistage centrifugal pump - Google Patents
Multistage centrifugal pump Download PDFInfo
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- CN111946622A CN111946622A CN202010698807.2A CN202010698807A CN111946622A CN 111946622 A CN111946622 A CN 111946622A CN 202010698807 A CN202010698807 A CN 202010698807A CN 111946622 A CN111946622 A CN 111946622A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to the technical field of centrifugal pumps, in particular to a multistage centrifugal pump which comprises a rack, a liquid inlet control mechanism, a first liquid inlet section, a second liquid inlet section, a middle impeller mechanism, a liquid outlet section, a pump shaft, an axial fixing mechanism, a driving mechanism and a controller, wherein the liquid inlet control mechanism is arranged on the rack; the centrifugal pump comprises a frame, a pump shaft, a liquid inlet control mechanism, a liquid outlet control mechanism, a pump shaft and a pump shaft, wherein all parts except a driving mechanism on the frame form a complete centrifugal pump main body; the scheme reduces the axial stress of the centrifugal pump and realizes self-balancing.
Description
Technical Field
The invention relates to the technical field of centrifugal pumps, in particular to a multistage centrifugal pump.
Background
The existing multistage centrifugal pump mainly comprises two structures of a D-type multistage centrifugal pump and a DG-type multistage centrifugal pump, wherein impellers are sequentially arranged from left to right or from right to left, and a ZD-type self-balancing multistage centrifugal pump with self-balancing axial force and symmetrically arranged impellers, wherein the pumps are all multistage centrifugal pumps formed by single-suction impellers or double-suction impellers at the first stage and single-suction impellers at the rest, and are also multi-stage centrifugal pumps formed by double-suction impellers. For the multi-stage centrifugal pump composed of full double suction impellers, because the double suction impellers are adopted, the flow channel between the impeller stages is very complicated and is difficult to realize when the impeller stages are multiple, and the general multi-stage centrifugal pump composed of the double suction impellers is only 2 to 3 stages. The impeller is sequentially arranged in a D-type and a DG-type multistage centrifugal pump, and a conveying medium is from an inlet at one end to an outlet at the other end; the ZD type self-balancing multistage centrifugal pump with self-balancing axial force is symmetrically arranged on the impeller, and a conveying medium enters from an inlet at one end, is connected to the other end through a flow guide pipe when approaching the middle position and then is discharged from an outlet at the middle part; although the interstage flow path of the multistage centrifugal pump composed of the double-suction impeller is quite complicated, the interstage flow path of the multistage centrifugal pump is provided with only one inlet and one outlet for conveying media.
In order to ensure the effectiveness of the high-pressure end seal of the pump, the multistage centrifugal pump with the structure often needs to be provided with a balance water pipe to reduce the pressure at the high-pressure end shaft seal of the pump. The multi-stage centrifugal pump consisting of the pump with the symmetrically arranged impellers and the double-suction impeller also needs to be provided with a sealing device at the high-pressure and low-pressure subareas of the pump to prevent a large amount of leakage of a medium. And the arrangement of the balance water pipe and the sealing device inevitably increases the volume loss of the pump and reduces the efficiency of the pump.
The existing multistage centrifugal pump introduces water flow pressurized by multistage impellers into opposite impeller groups through a guide pipe to generate opposite forces so as to carry out hedging, but the structure still cannot avoid axial stress in the starting process.
Disclosure of Invention
In order to solve the technical problem, the technical scheme solves the problem, reduces the axial stress of the centrifugal pump, realizes self-balancing, and ensures that the axial forces generated by the two groups of middle-section impeller mechanisms are the same through the liquid inlet control mechanism.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a multistage centrifugal pump is characterized by comprising a rack, a liquid inlet control mechanism, a first liquid inlet section, a second liquid inlet section, a middle impeller mechanism, a liquid outlet section, a pump shaft, an axial fixing mechanism, a driving mechanism and a controller;
all parts except a driving mechanism on a rack form a complete centrifugal pump main body, a pump shaft input end is fixedly connected with a driving mechanism output end, a liquid inlet control mechanism output end is simultaneously connected with a first liquid inlet section and a second liquid inlet section in parallel, the first liquid inlet section and the second liquid inlet section are coaxially and symmetrically arranged about a liquid outlet section, a pair of middle impeller mechanisms are respectively arranged between the first liquid inlet section and the liquid outlet section and between the second liquid inlet section and the liquid outlet section, one end, far away from the liquid outlet section, of an axial fixing mechanism from the first liquid inlet section is connected to one end, far away from the liquid outlet section, of the second liquid inlet section, the working end of the middle impeller mechanism is coaxially and fixedly connected with the pump shaft, the working directions of the pair of middle impeller mechanisms are oppositely arranged and face the liquid outlet section, and the liquid.
Preferably, the liquid inlet control mechanism comprises a liquid dividing pipe, a first flow meter, a second flow meter, a first flow control valve and a second flow control valve; divide liquid pipe bottom and outside inlet conduit to be connected, divide liquid pipe top and outside water piping connection, divide a pair of output of liquid pipe respectively with first income liquid section, the input intercommunication of second income liquid section, first flowmeter and first flow control valve, second flowmeter and second flow control valve collocation set up respectively in dividing on the connection route of liquid pipe and first income liquid section in groups, divide the liquid pipe and go into the connection route of liquid section with the second, first flowmeter, the second flowmeter, first flow control valve, the second flow control valve all is connected with the controller electricity.
Preferably, the liquid distribution pipe is provided with a first liquid inlet pipe, a water supplementing pipe and a first liquid outlet pipe; first feed liquor pipe is installed in branch liquid pipe bottom, and the moisturizing pipe is installed on branch liquid pipe top, and a pair of first drain pipe sets up in the both sides of first feed liquor pipe symmetrically and communicates with the input of first income liquid section, second income liquid section respectively.
Preferably, the first liquid inlet pipe, the water replenishing pipe and the first liquid outlet pipe are fixedly connected with other pipelines in a flange connection mode.
Preferably, the first liquid inlet section comprises a first casing, a first fixed seat, a first mounting lug and a second liquid inlet pipe; the first machine shell is communicated with two ends of the first machine shell and is communicated with one end of the axial fixing mechanism and the input end of the middle impeller mechanism respectively, the first fixing seat is installed at the bottom of the first machine shell and is fixedly connected with the machine frame, the first installation lugs are uniformly distributed on the outer wall of the first machine shell around the axis of the first machine shell and are fixedly connected with the axial fixing mechanism, and the second liquid inlet pipe is arranged on one side of the first liquid inlet section and is communicated with the output end of the liquid inlet control mechanism.
Preferably, the middle-section impeller mechanism is provided with a plurality of groups of guide wing chambers, guide wings and impellers, the impellers are coaxially arranged in the guide wings, the guide wings are coaxially arranged in the guide wing chambers, the guide wing chambers are connected in series in a closing mode, a pump shaft penetrates through the middle-section impeller mechanism and is fixedly connected with the impellers, the input ends of the pair of middle-section impeller mechanisms face the first liquid inlet section and the second liquid inlet section respectively, and the output ends of the middle-section impeller mechanisms face the input ends of the liquid outlet sections.
Preferably, the liquid outlet section comprises a second machine shell, a second fixed seat, a second mounting lug and a second liquid outlet pipe; the two ends of the second casing are respectively connected with the output ends of the two groups of middle-section impeller mechanisms, the second fixing seat is installed at the bottom of the second fixing seat and fixedly connected with the top end of the rack, the second installation lug is installed on the outer wall of the second casing around the axis of the second casing and fixedly connected with the axial fixing mechanism, and the second liquid outlet pipe is arranged on the outer wall of the second casing and communicated with the outside.
Preferably, the axial fixing mechanism comprises a pump head front cover, a pump head, a bearing assembly and a pull rod; the axial fixing mechanism is located the first structure that goes into liquid section and second and goes into liquid section both sides the same, the difference only lies in that the bearing assembly both ends that are close to the second and go into liquid section are all link up by the pump shaft, it is sealed that the one side of going out liquid section is kept away from to the bearing assembly that is close to first income liquid section one side, the pump head protecgulum is installed in first income liquid section, the second goes into liquid section and keeps away from one of liquid section direction and serve, pump head fixed mounting is at the opposite side of pump head protecgulum, bearing assembly fixed mounting is on the pump head, a plurality of pull rods surround first income liquid section uniformly, the axis and the first income liquid section of liquid section are gone into to the second, the second goes into liquid section fixed connection, the pump shaft runs through the pump head protec.
Preferably, the bearing assembly comprises an inner bearing cover plate, an outer bearing cover plate and a bearing; the inner bearing cover plate is coaxially and fixedly arranged on the inner side of the pump head, the outer bearing cover plate is coaxially and fixedly arranged on the outer side of the pump head, the inner bearing cover plate and the outer bearing cover plate are coaxially and mutually parallel, through holes for the pump shaft to pass through are formed in the inner bearing cover plate and the outer bearing cover plate, the bearing is arranged in the gap between the inner bearing cover plate and the outer bearing cover plate, the outer ring of the bearing is in interference fit with the pump head, and the inner ring of the bearing is in interference fit with the pump.
Preferably, the driving mechanism is a rotary driver, the rotary driver is fixedly mounted on the frame, an output end of the rotary driver is fixedly connected with an input end of the pump shaft through a rigid coupling, and the rotary driver is electrically connected with the controller.
Compared with the prior art, the invention has the beneficial effects that:
1. the axial stress of the centrifugal pump is reduced, self-balancing is realized, specifically, the axial fixing mechanism fixes the first liquid inlet section, the middle section impeller mechanism, the liquid outlet section, the middle section impeller mechanism and the second liquid inlet section together along the axial direction in sequence, the stability of the structure is ensured, the pair of middle section impeller mechanisms are arranged oppositely, the generated axial forces are mutually counteracted, the self-balancing effect of the centrifugal pump is realized, and no additional balancing disc is needed;
2. it is the same to have guaranteed through feed liquor control mechanism that the axial force that two sets of middle section impeller mechanisms produced is specific, the staff seals branch liquid pipe bottom earlier, then through the water injection of outside water pipe in to dividing the liquid pipe, rivers evenly flow to both ends dispersion in dividing the liquid pipe under the action of gravity, flow into respectively first income liquid section and second income liquid section with first income liquid section, second income liquid section fill with satisfying operating condition, can artifically directly add water toward dividing in the liquid pipe when the scene does not have the moisturizing pipeline. Liquid entering from the bottom of the liquid distribution pipe in a working state flows into the first liquid inlet section and the second liquid inlet section from two sides respectively. The first flowmeter and the second flowmeter respectively detect the flow of liquid passages flowing into the first liquid inlet section and the second liquid inlet section and send signals to the controller, and the controller sends signals to the first flow control valve and the second flow control valve to adjust the aperture so that the flow rates of liquid entering the first liquid inlet section and the second liquid inlet section are the same. Thereby ensuring that the axial forces generated by the pair of middle-section impeller mechanisms are the same.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a top view of the present invention;
FIG. 4 is a sectional view taken along line A-A of FIG. 3;
FIG. 5 is a partial enlarged view of FIG. 4 at B;
FIG. 6 is a perspective view of a liquid inlet control mechanism of the present invention;
FIG. 7 is a perspective view of a first liquid inlet section of the present invention;
FIG. 8 is a perspective view of a mid-stage impeller mechanism unit of the present invention;
FIG. 9 is an exploded perspective view of FIG. 8;
FIG. 10 is a perspective view of the tapping section of the present invention;
fig. 11 is a perspective exploded view of the axial fixing mechanism of the present invention.
Description of reference numerals:
1-a frame;
2-a liquid inlet control mechanism; 2 a-a liquid separating pipe; 2a 1-first inlet pipe; 2a 2-water replenishing pipe; 2a 3-a first outlet pipe; 2 b-a first flow meter; 2 c-a second flow meter; 2 d-a first flow control valve; 2 e-a second flow control valve;
3-a first liquid inlet section; 3 a-a first housing; 3 b-a first fixed seat; 3 c-a first mounting ear; 3 d-a second liquid inlet pipe;
4-a second liquid inlet section;
5-a middle impeller mechanism; 5 a-a guide vane chamber; 5 b-a guide wing; 5 c-an impeller;
6-liquid outlet section; 6 a-a second housing; 6 b-a second fixed seat; 6 c-a second mounting ear; 6 d-second outlet
A liquid pipe;
7-a pump shaft;
8-an axial fixing mechanism; 8 a-pump head front cover; 8 b-Pump head; 8 c-a bearing assembly; 8c 1-inner bearing cover plate; 8c 2-outer bearing cover plate; 8c 3-bearing; 8 d-a pull rod;
9-a drive mechanism; 9 a-a rotary drive; 9 b-rigid coupling.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
As shown in fig. 1 to 4, a multistage centrifugal pump comprises a frame 1, a liquid inlet control mechanism 2, a first liquid inlet section 3, a second liquid inlet section 4, a middle impeller mechanism 5, a liquid outlet section 6, a pump shaft 7, an axial fixing mechanism 8, a driving mechanism 9 and a controller;
all parts except a driving mechanism 9 on a frame 1 form a complete centrifugal pump main body, the input end of a pump shaft 7 is fixedly connected with the output end of the driving mechanism 9, the output end of a liquid inlet control mechanism 2 is simultaneously connected with a first liquid inlet section 3 and a second liquid inlet section 4 in parallel, the first liquid inlet section 3 and the second liquid inlet section 4 are coaxially and symmetrically arranged relative to a liquid outlet section 6, a pair of middle-section impeller mechanisms 5 are respectively arranged between the first liquid inlet section 3 and the liquid outlet section 6 and between the second liquid inlet section 4 and the liquid outlet section 6, one end, far away from the liquid outlet section 6, of each axial fixing mechanism 8 from the first liquid inlet section 3 is connected to one end, far away from the liquid outlet section 6, of each second liquid inlet section 4, the working ends of the middle-section impeller mechanisms 5 are coaxially and fixedly connected with the pump shaft 7, the working directions of the pair of middle-section impeller mechanisms 5 are oppositely arranged.
The staff makes first income liquid section 3 and second go into liquid section 4 and all fill water through annotating water in to feed liquor control mechanism 2 to guarantee the prerequisite of centrifugal pump work. The staff still gets into the liquid flow of first income liquid section 3 and second income liquid section 4 respectively through feed liquor control mechanism 2 monitoring and controls through the controller, ensures that the liquid flow that gets into first income liquid section 3 and second income liquid section 4 is the same. The axial fixing mechanism 8 fixes the first liquid inlet section 3, the middle impeller mechanism 5, the liquid outlet section 6, the middle impeller mechanism 5 and the second liquid inlet section 4 together along the axial direction in sequence, so that the stability of the structure is ensured. A worker sends a signal to the driving mechanism 9 through the controller, the driving mechanism 9 drives the pump shaft 7 to rotate after receiving the signal, and the pump shaft 7 simultaneously drives the two groups of middle-section impeller mechanisms 5 to rotate when rotating. The two groups of middle-section impeller mechanisms 5 respectively pressurize and guide the liquid in the first liquid inlet section 3 and the second liquid inlet section 4 into the liquid outlet section 6 gradually, and finally leave the centrifugal pump through the output end of the liquid outlet section 6. Because the pair of middle-section impeller mechanisms 5 are oppositely arranged, the generated axial forces are mutually counteracted, thereby realizing the self-balancing effect of the centrifugal pump without additionally arranging a balancing disc. Sealing materials such as sealing rings, fillers and the like are arranged at the joints of all components of the centrifugal pump so as to ensure the internal sealing property.
As shown in fig. 3 and fig. 6, the liquid inlet control mechanism 2 includes a liquid separating pipe 2a, a first flow meter 2b, a second flow meter 2c, a first flow control valve 2d and a second flow control valve 2 e; divide liquid pipe 2a bottom and outside inlet channel to be connected, divide liquid pipe 2a top and outside water piping connection, divide a pair of output of liquid pipe 2a respectively with first income liquid section 3, the input intercommunication of second income liquid section 4, first flowmeter 2b and first flow control valve 2d, second flowmeter 2c and second flow control valve 2e collocation set up respectively in dividing the liquid pipe 2a and the first connected way that goes into liquid section 3 in groups, divide on liquid pipe 2a and the second connected way that goes into liquid section 4, first flowmeter 2b, second flowmeter 2c, first flow control valve 2d, second flow control valve 2e all is connected with the controller electricity.
The first flowmeter 2b and the second flowmeter 2c are both electromagnetic flowmeters. The first flow control valve 2d and the second flow control valve 2e are electric butterfly valves, and the flow rate can be flexibly changed. The staff seals earlier and divides liquid pipe 2a bottom, then through water injection in the outside water pipe divides liquid pipe 2a, rivers evenly flow to both ends dispersion in dividing liquid pipe 2a under the action of gravity, flow into first income liquid section 3 and second income liquid section 4 respectively and pour into first income liquid section 3, second income liquid section 4 and fill up in order to satisfy operating condition, can directly add water in dividing liquid pipe 2a by the manual work when the scene does not have the moisturizing pipeline. Liquid entering from the bottom of the liquid separation pipe 2a in the working state respectively flows into the first liquid inlet section 3 and the second liquid inlet section 4 from two sides. The first flowmeter 2b and the second flowmeter 2c respectively detect the flow of liquid passages flowing into the first liquid inlet section 3 and the second liquid inlet section 4 and send signals to the controller, and the controller sends signals to the first flow control valve 2d and the second flow control valve 2e to adjust the aperture so that the flow rates of the liquid entering the first liquid inlet section 3 and the second liquid inlet section 4 are the same. Thereby ensuring that the axial forces generated by the pair of mid-stage impeller means 5 are the same.
As shown in fig. 6, the liquid distribution pipe 2a is provided with a first liquid inlet pipe 2a1, a water replenishing pipe 2a2 and a first liquid outlet pipe 2a 3; first feed liquor pipe 2a1 is installed in minute liquid pipe 2a bottom, and moisturizing pipe 2a2 is installed on minute liquid pipe 2a top, and a pair of first drain pipe 2a3 sets up symmetrically in the both sides of first feed liquor pipe 2a1 and communicates with the input of first income liquid section 3, second income liquid section 4 respectively.
The first liquid inlet pipe 2a1 and the water replenishing pipe 2a2 are respectively and independently provided with a control valve for controlling opening and closing. The water replenishing pipe 2a2 is arranged at the upper end, so that a worker can replenish water into the liquid separating pipe 2a under the condition that no external water pipe exists. In the working state, the centrifugal pump introduces and equally distributes liquid into the first liquid inlet section 3 and the second liquid inlet section 4 through the first liquid inlet pipe 2a 1.
As shown in fig. 6, the first liquid inlet pipe 2a1, the water replenishing pipe 2a2, and the first liquid outlet pipe 2a3 are fixedly connected with other pipes by way of flange connection.
The flange connection mode is convenient for disassembly and assembly, and is favorable for maintenance.
As shown in fig. 7, the first liquid inlet section 3 includes a first housing 3a, a first fixing seat 3b, a first mounting lug 3c, and a second liquid inlet pipe 3 d; the two ends of the first machine shell 3a are communicated with one end of the axial fixing mechanism 8 and the input end of the middle impeller mechanism 5 respectively, the first fixing seat 3b is installed at the bottom of the first machine shell 3a and is fixedly connected with the machine frame 1, the first installation lugs 3c are uniformly distributed on the outer wall of the first machine shell 3a around the axis of the first machine shell 3a and are fixedly connected with the axial fixing mechanism 8, and the second liquid inlet pipe 3d is arranged on one side of the first liquid inlet section 3a and is communicated with the output end of the liquid inlet control mechanism 2.
A cavity for containing liquid is formed in the first housing 3a, and one end of the first housing 3a connected with the middle impeller mechanism 5 is an output end of the first housing 3 a. The first liquid inlet section 3 is fixed on the frame 1 through the first fixing seat 3b, and further, other structures except the driving mechanism 9 of the centrifugal pump can be supported. The pull rod 8d of the axial fixing mechanism 8 is inserted into the first mounting lug 3c and then fastened through a bolt, so that the first liquid inlet section 3, the middle-section impeller mechanism 5, the liquid outlet section 6, the middle-section impeller mechanism 5 and the second liquid inlet section 4 are conveniently connected together. The second liquid inlet pipe 3d leads the liquid output by the liquid inlet control mechanism 2 into a cavity in the first housing 3a and finally into the middle impeller mechanism 5.
As shown in fig. 5, 8 and 9, the middle-stage impeller mechanism 5 is provided with a plurality of sets of guide vane chambers 5a, guide vanes 5b and impellers 5c, the impellers 5c are coaxially installed in the guide vanes 5b, the guide vanes 5b are coaxially installed in the guide vane chambers 5a, the plurality of sets of guide vane chambers 5a are connected in series at the end to end, a pump shaft 7 penetrates through the middle-stage impeller mechanism 5 and is fixedly connected with the impellers 5c, the input ends of the pair of middle-stage impeller mechanisms 5 respectively face the first liquid inlet section 3 and the second liquid inlet section 4, and the output end of the middle-stage impeller mechanism 5 faces the input end of the liquid outlet section 6.
The centrifugal pump mainly conveys liquid by the centrifugal force generated when the impellers 5c rotate, when the impellers 5c rotate rapidly, the liquid is driven to rotate at a high speed, the pressure is increased along with the rotation, the rotating liquid is thrown out from the impellers 5c along the tangential direction under the action of the centrifugal force, a vacuum area is formed in the center of the impellers 5c, and water at the input end is sucked into the impellers 5 c. And the water thrown out by the impeller 5c enters the impeller 5c of the next stage through the flow passage of the guide vane 5b and the guide vane chamber 5 a. Flows through all the impellers 5c, the guide wings 5b and the guide wing chambers 5a in sequence, and the energy of the liquid is gradually increased so as to obtain a certain lift.
As shown in fig. 10, the liquid outlet section 6 includes a second casing 6a, a second fixing seat 6b, a second mounting lug 6c and a second liquid outlet pipe 6 d; the both ends of second casing 6a are connected with 5 output ends of two sets of middle section impeller mechanisms respectively, and second fixing base 6b installs in second fixing base 6b bottom and with 1 top fixed connection of frame, and second installation ear 6c is installed at second casing 6a outer wall and with axial fixity mechanism 8 fixed connection around second casing 6a axis, and second drain pipe 6d is seted up on second casing 6a outer wall and is communicate with the outside.
The liquid outlet section 6 is fixedly connected with the first liquid inlet section 3 and the second liquid inlet section 4 through the matching of the pull rod 8d of the axial fixing mechanism 8 and the second mounting lug 6 c. The chamber in the second casing 6a receives the liquid from the output end of the middle impeller mechanism 5 at both sides and then sends the pressurized liquid out of the centrifugal pump through a second liquid outlet pipe 6d, wherein the second liquid outlet pipe 6d is the output end of the whole centrifugal pump. The second fixed seat 6b provides support and fixation for the liquid outlet section 6.
As shown in fig. 2, 4 and 11, the axial fixing mechanism 8 includes a pump head front cover 8a, a pump head 8b, a bearing assembly 8c and a pull rod 8 d; the axial fixing mechanism 8 is located the first section of intaking 3 and the second section of intaking 4 both sides structure is the same, the difference only lies in that the bearing assembly 8c both ends that are close to the second section of intaking 4 are all link up by pump shaft 7, the bearing assembly 8c that is close to first section of intaking 3 one side is kept away from the one side of going out liquid section 6 and is sealed, pump head protecgulum 8a is installed in first section of intaking 3, the second section of intaking 4 is kept away from one end of going out liquid section 6 direction, pump head 8b fixed mounting is in the opposite side of pump head protecgulum 8a, bearing assembly 8c fixed mounting is on pump head 8b, a plurality of pull rods 8d are evenly around first section of intaking 3, the axis of second section of intaking 4 and first section of intaking 3, the second section of intaking 4 fixed connection of intaking 4, pump shaft 7 runs through pump head protecgulum 8a, pump head 8b, bearing assembly 8c working end and pump shaft 7.
The staff presses the cap to assemble first income liquid section 3 and the second with pump head protecgulum 8a through the packing and goes into the liquid section 4 outside, then passes through bolt fixed mounting with pump head 8b on pump head protecgulum 8a, and bearing assembly 8c working end plays fixed effect to the both ends of pump shaft 7, makes it only can be rotatory around self axis. Two ends of the pull rod 8d are fixedly connected with the first liquid inlet section 3 and the second liquid inlet section 4 through bolts, so that the liquid outlet section 6 and the two groups of middle-section impeller mechanisms 5 are mutually fixed and clamped in the axial direction. The sealing performance is ensured by the packing in the axial fixing mechanism 8.
As shown in fig. 11, the bearing assembly 8c includes an inner bearing cover plate 8c1, an outer bearing cover plate 8c2, and a bearing 8c 3; inner bearing apron 8c1 is coaxial fixed mounting inboard at pump head 8b, outer bearing apron 8c2 is coaxial fixed mounting in the pump head 8b outside, inner bearing apron 8c1, outer bearing apron 8c2 is coaxial and set up parallel to each other, all be equipped with the via hole that supplies pump shaft 7 to pass through on inner bearing apron 8c1 and the outer bearing apron 8c2, bearing 8c3 installs in the clearance department of inner bearing apron 8c1 and outer bearing apron 8c2, bearing 8c3 outer lane and pump head 8b interference fit, bearing 8c3 inner circle and pump shaft 7 interference fit.
The bearing 8c3 is fixed to the pump head 8b by the inner bearing cover plate 8c1 and the outer bearing cover plate 8c2, so that the smoothness of rotation of the pump shaft 7 is ensured on the premise of supporting and fixing the pump shaft 7. The outer bearing cover plate 8c2 close to the first liquid inlet section 3 is of a blind hole structure, the outer bearing cover plate 8c2 close to the second liquid inlet section 4 is of a through structure, and the pump shaft 7 is fixedly connected with the output end of the driving mechanism 9 through the through of the outer bearing cover plate 8c2 on the side.
As shown in fig. 2 and fig. 3, the driving mechanism 9 is a rotary driver 9a, the rotary driver 9a is fixedly mounted on the frame 1, an output end of the rotary driver is fixedly connected with an input end of the pump shaft 7 through a rigid coupling 9b, and the rotary driver 9a is electrically connected with the controller.
The driving mechanism 9 is a servo motor provided with a speed reducer. The driving mechanism 9 is protected through the speed reducer, and maintenance cost is reduced. The output end of the driving mechanism 9 is connected with the pump shaft 7 through a rigid coupling 9b, and the driving is provided for the centrifugal pump integrally.
The working principle of the invention is as follows:
the device realizes the functions of the invention through the following steps, thereby solving the technical problems provided by the invention:
step one, the staff makes first income liquid section 3 and second go into liquid section 4 and all fill water in through annotating water to liquid inlet control mechanism 2 to guarantee the prerequisite of centrifugal pump work.
And step two, monitoring the liquid flow rate entering the first liquid inlet section 3 and the second liquid inlet section 4 respectively through the liquid inlet control mechanism 2 by the working personnel and controlling the liquid flow rate through the controller to ensure that the liquid flow rate entering the first liquid inlet section 3 and the liquid flow rate entering the second liquid inlet section 4 are the same.
And step three, the worker sends a signal to the driving mechanism 9 through the controller, the driving mechanism 9 drives the pump shaft 7 to rotate after receiving the signal, and the pump shaft 7 drives the two groups of middle-section impeller mechanisms 5 to rotate simultaneously when rotating.
And step (3) the two groups of middle-section impeller mechanisms 5 respectively pressurize and guide the liquid in the first liquid inlet section 3 and the second liquid inlet section 4 into the liquid outlet section 6 step by step, and finally leave the centrifugal pump through the output end of the liquid outlet section 6. Because the pair of middle-section impeller mechanisms 5 are oppositely arranged, the generated axial forces are mutually counteracted, thereby realizing the self-balancing effect of the centrifugal pump without additionally arranging a balancing disc. Sealing materials such as sealing rings, fillers and the like are arranged at the joints of all components of the centrifugal pump so as to ensure the internal sealing property.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A multistage centrifugal pump is characterized by comprising a rack (1), a liquid inlet control mechanism (2), a first liquid inlet section (3), a second liquid inlet section (4), a middle impeller mechanism (5), a liquid outlet section (6), a pump shaft (7), an axial fixing mechanism (8), a driving mechanism (9) and a controller;
the centrifugal pump is characterized in that parts except a driving mechanism (9) on a rack (1) form a complete centrifugal pump main body, the input end of a pump shaft (7) is fixedly connected with the output end of the driving mechanism (9), the output end of a liquid inlet control mechanism (2) is simultaneously connected with a first liquid inlet section (3) and a second liquid inlet section (4) in parallel, the first liquid inlet section (3) and the second liquid inlet section (4) are coaxially and symmetrically arranged relative to a liquid outlet section (6), a pair of middle-section impeller mechanisms (5) are respectively arranged between the first liquid inlet section (3) and the liquid outlet section (6) and between the second liquid inlet section (4) and the liquid outlet section (6), an axial fixing mechanism (8) is connected to one end of the second liquid inlet section (4) far away from the liquid outlet section (6), the working end of the middle-section impeller mechanism (5) is coaxially and fixedly connected with the pump shaft (7), the working directions of the pair of middle-section impeller mechanisms (5) are oppositely arranged and face the liquid outlet section (6), the liquid inlet control mechanism (2) and the driving mechanism (9) are electrically connected with the controller.
2. A multistage centrifugal pump according to claim 1, wherein the liquid inlet control mechanism (2) comprises a liquid dividing pipe (2a), a first flow meter (2b), a second flow meter (2c), a first flow control valve (2d) and a second flow control valve (2 e); divide liquid pipe (2a) bottom and outside inlet channel to be connected, divide liquid pipe (2a) top and outside water piping connection, divide a pair of output of liquid pipe (2a) respectively with first income liquid section (3), the input intercommunication of second income liquid section (4), first flowmeter (2b) and first flow control valve (2d), second flowmeter (2c) and second flow control valve (2e) collocation set up respectively in dividing on the connecting way of liquid pipe (2a) and first income liquid section (3) in groups, divide on liquid pipe (2a) and the connecting way of second income liquid section (4), first flowmeter (2b), second flowmeter (2c), first flow control valve (2d), second flow control valve (2e) all are connected with the controller electricity.
3. A multistage centrifugal pump according to claim 2, wherein the liquid distribution pipe (2a) is provided with a first liquid inlet pipe (2a1), a water replenishing pipe (2a2) and a first liquid outlet pipe (2a 3); first feed liquor pipe (2a1) is installed and is being divided liquid pipe (2a) bottom, and moisturizing pipe (2a2) are installed and are being divided liquid pipe (2a) top, and a pair of first drain pipe (2a3) set up symmetrically in the both sides of first feed liquor pipe (2a1) and respectively with the input intercommunication of first income liquid section (3), second income liquid section (4).
4. A multistage centrifugal pump according to claim 3, wherein the first liquid inlet pipe (2a1), the water replenishing pipe (2a2) and the first liquid outlet pipe (2a3) are fixedly connected with other pipes in a flange connection mode.
5. A multistage centrifugal pump according to claim 1, wherein the first liquid inlet section (3) comprises a first casing (3a), a first fixed seat (3b), a first mounting lug (3c) and a second liquid inlet pipe (3 d); first casing (3a) both ends link up and respectively with the one end of axial fixity mechanism (8), middle section impeller mechanism (5) input communicates each other, install in first casing (3a) bottom and with frame (1) fixed connection first fixing base (3b), first installation ear (3c) around first casing (3a) axis evenly distributed on first casing (3a) outer wall with axial fixity mechanism (8) fixed connection, second feed liquor pipe (3d) are seted up and are just communicate with feed liquor control mechanism (2) output in first income liquid section (3) one side.
6. The multistage centrifugal pump according to claim 1, wherein the middle impeller mechanism (5) is provided with a plurality of sets of guide vane chambers (5a), guide vanes (5b) and impellers (5c), the impellers (5c) are coaxially installed in the guide vanes (5b), the guide vanes (5b) are coaxially installed in the guide vane chambers (5a), the plurality of sets of guide vane chambers (5a) are connected in series at the tail end, the pump shaft (7) penetrates through the middle impeller mechanism (5) and is fixedly connected with the impellers (5c), the input ends of the pair of middle impeller mechanisms (5) face the first liquid inlet section (3) and the second liquid inlet section (4), respectively, and the output ends of the middle impeller mechanism (5) face the input end of the liquid outlet section (6).
7. A multistage centrifugal pump according to claim 1, wherein the liquid outlet section (6) comprises a second casing (6a), a second fixed seat (6b), a second mounting lug (6c) and a second liquid outlet pipe (6 d); second casing (6a) both ends are connected with two sets of middle section impeller mechanism (5) output respectively, second fixing base (6b) install in second fixing base (6b) bottom and with frame (1) top fixed connection, second installation ear (6c) around second casing (6a) axis install in second casing (6a) outer wall and with axial fixity mechanism (8) fixed connection, second drain pipe (6d) set up on second casing (6a) outer wall and with outside intercommunication.
8. A multistage centrifugal pump according to claim 1, wherein said axial fixing means (8) comprises a pump head front cover (8a), a pump head (8b), a bearing assembly (8c) and a tie rod (8 d); the axial fixing mechanism (8) is located the same structure of first income liquid section (3) and second income liquid section (4) both sides, the difference only lies in that the bearing assembly (8c) both ends that are close to second income liquid section (4) are all link up by pump shaft (7), one side of going out liquid section (6) is kept away from to bearing assembly (8c) that is close to first income liquid section (3) one side is sealed, pump head protecgulum (8a) are installed in first income liquid section (3), second income liquid section (4) are kept away from on one end of going out liquid section (6) direction, pump head (8b) fixed mounting is in the opposite side of pump head protecgulum (8a), bearing assembly (8c) fixed mounting is on pump head (8b), a plurality of pull rods (8d) are around first income liquid section (3) uniformly, the axis and first income liquid section (3) of second income liquid section (4), second income liquid section (4) fixed connection, pump shaft (7) run through protecgulum (8a), The working end of the pump head (8b) and the bearing assembly (8c) are in interference fit with the pump shaft (7).
9. A multistage centrifugal pump according to claim 8, wherein the bearing assembly (8c) comprises an inner bearing cover plate (8c1), an outer bearing cover plate (8c2) and a bearing (8c 3); inner bearing apron (8c1) is coaxial fixed mounting inboard at pump head (8b), outer bearing apron (8c2) is coaxial fixed mounting in the pump head (8b) outside, inner bearing apron (8c1), outer bearing apron (8c2) is coaxial and set up parallel to each other, all be equipped with the via hole that supplies pump shaft (7) to pass through on inner bearing apron (8c1) and outer bearing apron (8c2), bearing (8c3) are installed in the clearance department of inner bearing apron (8c1) and outer bearing apron (8c2), bearing (8c3) outer lane and pump head (8b) interference fit, bearing (8c3) inner circle and pump shaft (7) interference fit.
10. A multistage centrifugal pump according to claim 1, wherein the drive mechanism (9) is a rotary driver (9a), the rotary driver (9a) is fixedly mounted on the frame (1) and the output end is fixedly connected with the input end of the pump shaft (7) through a rigid coupling (9b), and the rotary driver (9a) is electrically connected with the controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010698807.2A CN111946622A (en) | 2020-07-20 | 2020-07-20 | Multistage centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010698807.2A CN111946622A (en) | 2020-07-20 | 2020-07-20 | Multistage centrifugal pump |
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| CN111946622A true CN111946622A (en) | 2020-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010698807.2A Withdrawn CN111946622A (en) | 2020-07-20 | 2020-07-20 | Multistage centrifugal pump |
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| CN (1) | CN111946622A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417863A (en) * | 2021-07-30 | 2021-09-21 | 沈阳通达水泵制造有限公司 | Short cantilever sealed built-in self-balancing centrifugal pump |
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Application publication date: 20201117 |