CN210196029U

CN210196029U - Pump case assembly for multi-stage pump

Info

Publication number: CN210196029U
Application number: CN201921211852.XU
Authority: CN
Inventors: Zhengjun Li; 李郑君
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2020-03-27
Anticipated expiration: 2029-07-30

Abstract

The utility model provides a pump case assembly for multistage pump belongs to water pump technical field. The pump shell for the multistage pump solves the problems that the existing pump shell for the multistage pump is large in noise, large in head loss and the like. This pump case assembly for multistage pump includes the section of intaking, the middle section, go out water section and pump shaft, the section of intaking, all be equipped with an impeller in middle section and the play water section, the section of intaking is including the face of intaking, the turn-ups of intaking, the middle section is including the middle section face, the middle section turn-ups, the outer terminal surface of each middle section face has all linked firmly a imbibition wheel, imbibition wheel includes metal face and metal stator, it includes the face of going out water to go out the water section, the turn-ups of going out water, between middle section face and the pump shaft, it all is equipped with the water hole to go out between face and the pump shaft, the turn-ups of intaking, the turn-ups of middle section and the turn-ups of going out water superpose into the column in proper order, the impeller. The utility model has the advantages of small noise, small head loss, high lift and the like.

Description

Pump case assembly for multi-stage pump

Technical Field

The utility model belongs to the technical field of the water pump, a multistage pump accessory is related to, in particular to pump case assembly for multistage pump.

Background

The multi-stage pump is one kind of centrifugal pump, and is composed of water inlet section, water outlet section, middle section, tail cover, impeller, pump body, pump shaft, bearing, stuffing box and other parts. The existing multistage pump has the problems of poor suction performance, large axial force and large head loss, so that the lift is not ideal enough, and the water using fields such as water supply and drainage of high-rise buildings and the like which need high lift cannot be met.

In view of the above problems, various multi-stage pumps have been designed, and some of them have been applied for patent, for example, chinese patent literature discloses a horizontal multi-stage pump with a variable design head [ application No.: 201610476391.3, respectively; application publication No.: CN106122030A ], which comprises a pump body, a pump shaft is arranged in the pump body, two ends of the pump shaft are respectively arranged on a water inlet section bearing and a water outlet section bearing, a shaft coupling is arranged at the connecting end of the pump shaft and an output shaft of a motor, the pump body comprises a water inlet section, a water outlet section, a plurality of middle sections and tail covers which are sequentially communicated, the pump shaft is arranged in the water inlet section, the middle sections, the water outlet section and the tail covers in a penetrating way, the suction section is provided with a suction inlet, the water outlet section is provided with a discharge outlet, the suction inlet and the discharge outlet are both arranged upwards, the pump shaft in the inner cavity of the multi-section pump body is provided with a plurality of impellers, the impellers comprise a first-stage impeller arranged on the pump shaft close to the water inlet section and a plurality of secondary impellers behind the first-stage impeller, one side of the water outlet section of the pump, the outer diameter of the back-stage impeller is larger than that of the front-stage impeller, and the diameter of the hub of the back-stage impeller is equal to that of the hub of the front-stage impeller.

The horizontal multi-stage pump with the variable design lift can improve the water inlet efficiency and the lift, but the water inlet section, the middle section and the water outlet section are the same as those of the existing multi-stage pump and are all formed by casting, and the impeller is also formed by casting, so that the environmental pollution is large, the surface roughness is high, the greater water passing noise is caused, the water flow velocity is also reduced, certain collision and blockage exist in fluid, and the lift is reduced.

Disclosure of Invention

The utility model aims at providing a pump case assembly for multistage pump that small in noise, lift are high to the above-mentioned problem that exists among the prior art.

The purpose of the utility model can be realized by the following technical proposal: a pump case assembly for a multi-stage pump comprises a water inlet section, a water outlet section and a pump shaft, wherein a plurality of middle sections are arranged between the water inlet section and the water outlet section, a bracket is further arranged at the outer end part of the water inlet section, the pump shaft sequentially penetrates through the bracket, the water inlet section, the middle sections and the water outlet section, a bearing structure is arranged between the bracket and the pump shaft, the water inlet section is provided with a water inlet hole, the water outlet section is provided with a water outlet hole, and the pump case assembly is characterized in that an impeller fixedly connected with the pump shaft is arranged in the water inlet section, the middle section comprises a water inlet plate surface made of a metal plate, a water inlet flanging is arranged at the edge of the water inlet plate surface, the middle section comprises a middle plate surface made of the metal plate, a middle flanging is arranged at the edge of the middle plate surface, a liquid suction wheel is fixedly connected to the outer end surface of each plate surface, and the liquid suction wheel comprises a metal plate surface and a metal guide vane, the play water section include the edge that goes out water face and the play water face of making by the metal sheet and have a water turn-ups, middle section face and pump shaft between, all be equipped with the water hole between play water face and the pump shaft, the turn-ups of intaking, middle section turn-ups and play water turn-ups superpose in proper order and become the column, the impeller include metal bottom plate and metal roof, metal bottom plate and pump shaft between have sunction inlet and metal bottom plate and metal roof between the welding have metal vane.

In the pump casing assembly for the multistage pump, the impeller is provided with a cylindrical sleeve part welded with the metal bottom plate, the outer edge of the sleeve part of the impeller in the water inlet section is abutted against the inner wall of the water through hole, and the outer edges of the sleeve parts of the impeller in the middle section and the water outlet section are both abutted against the inner wall of the water through hole.

In foretell pump case assembly for multistage pump, the pump spindle on be equipped with to the metal roof bottom axial spacing limit structure one of impeller in the section of intaking, still be equipped with on the pump spindle to the metal roof top axial spacing limit structure two of impeller in the section of going out, the section of intaking and go out to be equipped with between two impellers of section of going out a quantity than middle section quantity one more and overlap and locate the epaxial fixed cover of pump, each fixed cover and pump spindle circumference location, the fixed cover between adjacent will correspond the metal roof centre gripping setting of impeller, contradict in the top of the metal roof of the interior impeller of section of intaking in the bottom of the first fixed cover of section side of intaking, contradict in the bottom of the metal roof of the interior impeller of section of going out in the last fixed cover of section of going out.

In foretell pump case assembly for multistage pump, limit structure one including be the tube-shape and overlap in the epaxial stop collar of pump one, the top of stop collar one touch in the bottom of the metal roof of the section impeller of intaking, pump shaft threaded connection have the lock sleeve of contradicting in stop collar one bottom, limit structure two including being the tube-shape and overlapping in the epaxial stop collar two of pump, the bottom of stop collar two contradict in the top of the metal roof of the section impeller of giving out water, the pump shaft on inlay and be equipped with jump ring and two inner walls of stop collar and have the fender shoulder of contradicting in the jump ring. The connection is convenient and firm.

In the pump case assembly for the multistage pump, the pump shaft is provided with the axially extending limiting surface, and the inner wall of the fixing sleeve is provided with the binding surface bound to the limiting surface.

In the pump case assembly for the multistage pump, the fixed sleeve is provided with a convex diameter section for abutting and sealing the inner ring of the metal plate surface of the liquid suction wheel, and the convex diameter section is provided with a drainage part which is positioned in the liquid suction wheel and is in fillet transition.

In the pump casing assembly for the multistage pump, the bracket and the water inlet section are of an integrated structure.

In the pump casing assembly for the multistage pump, the bearing structure comprises an alloy outer sleeve connected with the bracket hole of the bracket in an interference fit manner, the pump shaft is sleeved with the alloy inner sleeve in an interference fit manner, and the outer ring of the alloy inner sleeve is in clearance fit with the inner ring of the alloy outer sleeve.

In the pump casing assembly for the multistage pump, a screw is axially arranged at the end part of the pump shaft extending out of the bracket in a penetrating way.

Compared with the prior art, this pump case assembly for multistage pump compact structure, whole small, it is convenient to make the equipment, long service life, and the surface that rivers passed through is smooth moreover, and it is smooth and easy to cross water, and head loss is little, and the lift is high.

Drawings

Fig. 1 is a front view of the pump casing assembly for the multistage pump.

Fig. 2 is a structural sectional view of the section a-a in fig. 1.

Fig. 3 is an exploded view of the pump casing assembly for the multi-stage pump.

Fig. 4 is a perspective view of a pump shaft in the pump housing assembly for the multistage pump.

Fig. 5 is a perspective view of a middle section of the pump housing assembly for the multistage pump.

Fig. 6 is a perspective view of an impeller in the pump housing assembly for the multistage pump.

Fig. 7 is an exploded structural view of a pump shaft, a fixing sleeve, a first limit sleeve and a second limit sleeve in the pump shell assembly for the multi-stage pump.

In the figure, 1, a water inlet section; 1a, a water inlet hole; 1b, a water inlet plate surface; 1c, water inlet flanging; 2. a water outlet section; 2a, water outlet holes; 2b, water outlet plate surface; 2c, water outlet flanging; 3. a pump shaft; 3a, a limiting surface; 4. a middle section; 4a, a middle plate surface; 4b, flanging the middle section; 5. a bracket; 6. an impeller; 6a, a metal bottom plate; 6b, a metal top plate; 6c, metal blades; 6d, a sleeve portion; 7. a liquid suction wheel; 7a, a metal plate surface; 7b, metal guide vanes; 8. water passing holes; 9. fixing a sleeve; 9a, a convex diameter section; 9b, a drainage part; 10. a first limiting sleeve; 11. a locking sleeve; 12. a second limiting sleeve; 13. a clamp spring; 14. an alloy jacket; 15. an alloy inner sleeve; 16. and (4) screws.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2, 3, 5 and 6, the pump casing assembly for the multi-stage pump comprises a water inlet section 1, a water outlet section 2 and a pump shaft 3, wherein a plurality of middle sections 4 are arranged between the water inlet section 1 and the water outlet section 2, the number of the middle sections 4 is set according to actual requirements, a bracket 5 is further arranged at the outer end part of the water inlet section 1, the pump shaft 3 sequentially penetrates through the bracket 5, the water inlet section 1, the middle sections 4 and the water outlet section 2, a bearing structure is arranged between the bracket 5 and the pump shaft 3, an impeller 6 fixedly connected with the pump shaft 3 is arranged in each of the water inlet section 1, the middle sections 4 and the water outlet section 2, the water inlet section 1 is provided with a water inlet hole 1a, the water outlet section 2 is provided with a water outlet hole 2a, the water inlet section 1 comprises a water inlet plate surface 1b made of a metal plate, a water inlet flanging 1c is arranged at the edge of the water inlet plate surface 1b, the outer end face of each middle section plate surface 4a is fixedly connected with a liquid absorbing wheel 7, each liquid absorbing wheel 7 comprises a metal plate surface 7a and a metal guide vane 7b welded between the outer end faces of the metal plate surface 7a and the middle section plate surface 4a, the water outlet section 2 comprises a water outlet plate surface 2b made of metal plates, the edge of the water outlet plate surface 2b is provided with a water outlet flanging 2c, water outlet holes 2a are circumferentially and evenly distributed on the water outlet flanging 2c, water through holes 8 are respectively arranged between the middle section plate surface 4a and the pump shaft 3 and between the water outlet plate surface 2b and the pump shaft 3, the water inlet flanging 1c, the middle section flanging 4b and the water outlet flanging 2c are sequentially overlapped into a column shape, the edge of the water inlet flanging 1c is used for the turnover position of the middle section flanging 4b of the first middle section 4 to abut against, the edge of the middle section flanging 4b of the first middle section 4 is used for the turnover position of the middle section flanging 4b of the next middle section 4 to abut against, the impeller 6 comprises a metal bottom plate 6a and a metal top plate 6b, a suction inlet is arranged between the metal bottom plate 6a and the pump shaft 3, and metal blades 6c are welded between the metal bottom plate 6a and the metal top plate 6 b.

The water passing section, the middle section 4 and the water outlet section 2 in the pump shell assembly for the multistage pump are all made of metal plates through the existing stamping, stretching, welding and surface rust removal treatment processes, the pollution to the environment is reduced, the surface is smooth, the water passing is smooth, the noise is low, a metal bottom plate 6a, a metal top plate 6b and metal blades 6c of an impeller 6 are made through the existing stamping, stretching and welding, the bending angle and the distribution of the metal blades 6c are the prior art, the design is determined according to size data, the whole structure is compact and small, the axial occupied space is small, the whole volume of the pump shell assembly is favorably reduced, the inner surface and the outer surface are smooth, the water passing is smooth, the noise is further reduced, the metal plate surface 7a and the metal guide vane 7b of a liquid suction wheel 7 are made through the existing stamping, stretching and welding, the bending angle and the distribution of the metal guide vane 7b and the size of a suction inlet formed by the metal guide vane 7b and the, the design is decided according to the size data, the surface is smooth, the water passing is smooth, the noise reduction effect is good, in the embodiment, all the parts of the metal plate, the impeller 6 and the liquid absorption wheel 7 are made of copper plates, and the water passing section, the middle section 4, the water outlet section 2, the impeller 6 and the liquid absorption wheel 7 are also made of stainless steel plates during actual manufacturing.

When the pump shell assembly for the multistage pump is used, water enters the impeller 6 of the water inlet section 1 from the water inlet hole 1a, the metal blades 6c of the impeller 6 drive the water to flow towards the outer edge of the impeller 6, meanwhile, the impeller 6 sucks the water from the water inlet, the liquid suction wheel 7 on the first middle section 4 behind the water inlet section 1 collects the water thrown out by the impeller 6 in the water inlet section 1, the pressure generated by the rotation of the liquid suction wheel 7 can press the water into the impeller 6 of the next middle section 4, the impeller 6 of the next middle section 4 throws the water out again, therefore, the water is thrown out by the impeller 6 of the last middle section 4 into the impeller 6 of the water outlet section 2 until the liquid suction wheel 7 of the last middle section 4 presses the water into the impeller 6 of the water outlet section 2, the water is discharged through the water outlet, the speed and the pressure of the water thrown out by the impeller 6 can be increased due to the action of centrifugal force, the multistage transmission is, the water outlet requirement of high lift can be realized.

In more detail, as shown in fig. 2 and 6, the impeller 6 has a cylindrical sleeve portion 6d welded to the metal bottom plate 6a, the outer edge of the sleeve portion 6d of the impeller 6 in the water inlet section 1 abuts against the inner wall of the water through hole 8, and the outer edges of the sleeve portions 6d of the impellers 6 in the middle section 4 and the water outlet section 2 both abut against the inner wall of the water through hole 8, so that the middle section 4 and the water outlet section 2 are conveniently positioned, water directly flows into the impeller 6 through the sleeve portion 6d, the intermediate loss is small, and the lift is increased.

For convenient assembly and firm connection with the impeller 6, as shown in fig. 7, a first limit structure for axially limiting the bottom of the metal top plate 6b of the impeller 6 in the water inlet section 1 is arranged on the pump shaft 3, a second limit structure for axially limiting the top of the metal top plate 6b of the impeller 6 in the water outlet section 2 is also arranged on the pump shaft 3, one more fixing sleeves 9 are arranged between the two impellers 6 of the water inlet section 1 and the water outlet section 2 than the middle section 4 and sleeved on the pump shaft 3, each fixing sleeve 9 is circumferentially positioned with the pump shaft 3, the metal top plate 6b corresponding to the impeller 6 is clamped and arranged by the adjacent fixing sleeve 9, the bottom of the first fixing sleeve 9 at the water inlet section 1 side is abutted against the top of the metal top plate 6b of the impeller 6 in the water inlet section 1, and the top of the last fixing sleeve 9 of the water outlet section 2 is abutted against the bottom of the metal top plate 6; in this embodiment, the first limit structure includes a first limit sleeve 10 which is cylindrical and is sleeved on the pump shaft 3, the top of the first limit sleeve 10 abuts against the bottom of the metal top plate 6b of the impeller 6 in the water inlet section 1, the pump shaft 3 is in threaded connection with a locking sleeve 11 which abuts against the bottom of the first limit sleeve 10, the second limit structure includes a second limit sleeve 12 which is cylindrical and is sleeved on the pump shaft 3, the bottom of the second limit sleeve 12 abuts against the top of the metal top plate 6b of the impeller 6 in the water outlet section 2, and the pump shaft 3 is embedded with a snap spring 13 and the inner wall of the second limit sleeve 12 is provided with a shoulder which abuts against the snap spring 13.

As shown in fig. 4 and 7, the pump shaft 3 has a limit surface 3a extending axially, and the inner wall of the fixed sleeve 9 has a joint surface jointed to the limit surface 3a, so that the fixed sleeve 9 and the pump shaft 3 are fixed circumferentially conveniently and are mounted conveniently. The fixed sleeve 9 is provided with a convex diameter section 9a for abutting and sealing the inner ring of the metal plate surface 7a of the liquid suction wheel 7, the convex diameter section 9a is provided with a drainage part 9b which is positioned in the liquid suction wheel 7 and is in fillet transition, the drainage part 9b weakens the impact resistance of the fixed sleeve 9 on the water suction flow of the liquid suction wheel 7, the head loss is reduced, and the water flow smoothly enters the next-stage impeller 6 along the drainage part 9 b.

Bracket 5 and the section of intaking 1 formula structure as an organic whole, bracket 5 has the connection rib of three circumference equipartitions in this embodiment, connects the rib and welds with the section of intaking 1 mutually and make bracket 5 and the section of intaking 1 link into an organic whole, and the structure is firm like this, and bracket 5 position accuracy nature is good, and bracket 5's radial positioning accuracy is high.

The bearing structure comprises an alloy outer sleeve 14 connected in a bracket hole of the bracket 5 in an interference fit manner, an alloy inner sleeve 15 is sleeved on the pump shaft 3 in an interference fit manner, and the outer ring of the alloy inner sleeve 15 is in clearance fit with the inner ring of the alloy outer sleeve 14. In this embodiment, the alloy outer sleeve 14 and the alloy inner sleeve 15 are both made of tungsten steel, and the alloy outer sleeve 14 and the alloy inner sleeve 15 have good wear resistance and long service life. The end part of the pump shaft 3 extending out of the bracket 5 is axially provided with a screw 16 in a penetrating way, and after the screw 16 is screwed down, the end part of the pump shaft 3 tends to expand outwards, so that the end part of the pump shaft 3 is more firmly connected with the alloy inner sleeve 15.

Those not described in detail in this specification are within the skill of the art. The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A pump shell assembly for a multi-stage pump comprises a water inlet section (1), a water outlet section (2) and a pump shaft (3), wherein a plurality of middle sections (4) are arranged between the water inlet section (1) and the water outlet section (2), a bracket (5) is further arranged at the outer end part of the water inlet section (1), the pump shaft (3) sequentially penetrates through the bracket (5), the water inlet section (1), the middle sections (4) and the water outlet section (2) to be arranged, a bearing structure is arranged between the bracket (5) and the pump shaft (3), the water inlet section (1) is provided with a water inlet hole (1 a), the water outlet section (2) is provided with a water outlet hole (2 a), and the pump shell assembly is characterized in that an impeller (6) fixedly connected with the pump shaft (3) is arranged in the water inlet section (1), the middle section (4) and the water outlet section (2), the water inlet section (1) comprises a water inlet plate surface (1 b) made of a metal plate, and a water inlet flanging (1 c) is arranged at the edge of, the water pump is characterized in that the middle section (4) comprises a middle section plate surface (4 a) made of a metal plate, a middle section flanging (4 b) is arranged at the edge of the middle section plate surface (4 a), a liquid suction wheel (7) is fixedly connected to the outer end surface of each middle section plate surface (4 a), the liquid suction wheel (7) comprises a metal plate surface (7 a) and a metal guide vane (7 b) welded between the outer end surfaces of the metal plate surface (7 a) and the middle section plate surface (4 a), the water outlet section (2) comprises a water outlet plate surface (2 b) made of the metal plate, a water outlet flanging (2 c) is arranged at the edge of the water outlet plate surface (2 b), water passing holes (8) are arranged between the middle section plate surface (4 a) and the pump shaft (3) and between the water outlet plate surface (2 b) and the pump shaft (3), and the water inlet flanging (1 c), the middle section flanging (4 b) and the water outlet flanging (2 c) are sequentially columnar, the impeller (6) comprises a metal bottom plate (6 a) and a metal top plate (6 b), a suction inlet is formed between the metal bottom plate (6 a) and the pump shaft (3), and metal blades (6 c) are welded between the metal bottom plate (6 a) and the metal top plate (6 b).

2. The pump casing assembly for the multistage pump according to claim 1, wherein the impeller (6) has a cylindrical sleeve portion (6 d) welded to the metal bottom plate (6 a), an outer edge of the sleeve portion (6 d) of the impeller (6) in the water inlet section (1) abuts against an inner wall of the water through hole (8), and outer edges of the sleeve portions (6 d) of the impellers (6) in the middle section (4) and the water outlet section (2) both abut against an inner wall of the water through hole (8) provided therein.

3. The pump shell assembly for the multistage pump according to claim 1 or 2, wherein the pump shaft (3) is provided with a first limit structure for axially limiting the bottom of the metal top plate (6 b) of the impeller (6) in the water inlet section (1), the pump shaft (3) is further provided with a second limit structure for axially limiting the top of the metal top plate (6 b) of the impeller (6) in the water outlet section (2), one more fixing sleeve (9) is arranged between the two impellers (6) in the water inlet section (1) and the water outlet section (2) than the middle section (4) and sleeved on the pump shaft (3), each fixing sleeve (9) is circumferentially positioned with the pump shaft (3), the metal top plate (6 b) corresponding to the impeller (6) is clamped and arranged by the adjacent fixing sleeve (9), the bottom of the first fixing sleeve (9) at the side of the water inlet section (1) is abutted against the top of the metal top plate (6 b) of the impeller (6) in the water inlet section (1), the top of the last fixed sleeve (9) of the water outlet section (2) is abutted against the bottom of the metal top plate (6 b) of the impeller (6) in the water outlet section (2).

4. The pump casing assembly for the multistage pump according to claim 3, characterized in that, limit structure one include be the tube-shape and overlap the stop collar one (10) on pump shaft (3), the top of stop collar one (10) top touch in the bottom of the metal roof (6 b) of impeller (6) in water inlet section (1), pump shaft (3) threaded connection have contradict in the lock sleeve (11) of stop collar one (10) bottom, limit structure two including be the tube-shape and overlap stop collar two (12) on pump shaft (3), the bottom of stop collar two (12) contradict in the top of the metal roof (6 b) of impeller (6) in water outlet section (2), pump shaft (3) on inlay and be equipped with jump ring (13) and stop collar that the inner wall of stop collar two (12) has the fender shoulder that contradicts in jump ring (13).

5. A pump housing assembly for a multistage pump according to claim 4, wherein the pump shaft (3) has an axially extending limiting surface (3 a), and the inner wall of the fixing sleeve (9) has an abutment surface which abuts against the limiting surface (3 a).

6. A pump casing assembly for a multistage pump according to claim 5, wherein said fixing sleeve (9) has a diameter section (9 a) for the inner ring of the metal plate surface (7 a) of the aspirating wheel (7) to be in interference seal, said diameter section (9 a) having a flow guide (9 b) in the aspirating wheel (7) with a rounded transition.

7. A pump housing assembly for a multistage pump according to claim 1, wherein the bracket (5) and the water inlet section (1) are of an integral construction.

8. A pump housing assembly for a multistage pump according to claim 1, 2 or 7, wherein the support structure comprises an outer alloy sleeve (14) which is connected with the bracket (5) of the bracket (5) in an interference fit manner, an inner alloy sleeve (15) is sleeved on the pump shaft (3) in an interference fit manner, and the outer ring of the inner alloy sleeve (15) is in clearance fit with the inner ring of the outer alloy sleeve (14).

9. A pump housing assembly for a multistage pump according to claim 8, wherein the end of the pump shaft (3) extending beyond the bracket (5) is provided with a screw (16) axially.