CN211950879U - Centrifugal pump for S-shaped rotary blade of PVC (polyvinyl chloride) slurry - Google Patents
Centrifugal pump for S-shaped rotary blade of PVC (polyvinyl chloride) slurry Download PDFInfo
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- CN211950879U CN211950879U CN201922061545.4U CN201922061545U CN211950879U CN 211950879 U CN211950879 U CN 211950879U CN 201922061545 U CN201922061545 U CN 201922061545U CN 211950879 U CN211950879 U CN 211950879U
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- pump
- impeller
- blade
- shaped rotary
- blades
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- 239000002002 slurry Substances 0.000 title claims abstract description 29
- 229920000915 polyvinyl chloride Polymers 0.000 title description 38
- 239000004800 polyvinyl chloride Substances 0.000 title description 38
- 239000007788 liquid Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 1
- 230000006378 damage Effects 0.000 abstract description 3
- 239000000178 monomer Substances 0.000 description 9
- 239000007787 solid Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 239000008187 granular material Substances 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Abstract
The utility model discloses a centrifugal pump for PVC slurry S-shaped rotary blades, which comprises a pump body, an impeller, a pump cover, an impeller nut, a bearing box body, a bearing body and a pump shaft; the pump comprises a pump body, a bearing box body and an impeller, wherein the front end of the pump body is connected with a pump cover, the rear end of the pump cover is connected with the bearing box body, the pump body and the pump cover are internally provided with the impeller, the impeller is provided with S-shaped rotary blades, the impeller is fixedly sleeved at the left end of the pump shaft, the right end of the pump shaft extends through the bearing box body, and the pump shaft and the bearing body are fixedly sleeved through a bearing. The utility model discloses a set up S type convolution blade and back blade to the linear velocity that reduces the impeller excircle is poor, thereby improves the throughput rate of medium, and reduces the free destruction degree to PVC.
Description
Technical Field
The utility model relates to a centrifugal pump technical field, concretely relates to centrifugal pump that is used for PVC thick liquids S type formula of circling round blade.
Background
The PVC slurry chemical centrifugal pump is generally applied to the industries such as chlor-alkali, plastics, polyvinyl chloride, polypropylene, chemical fiber and the like, and the working environment of the PVC slurry chemical centrifugal pump is worse than that of centrifugal pumps in other industries. The conveying medium has high temperature, high viscosity, suspended particles and solid content diameter larger than 10mm, and when the reaction is insufficient, the medium can be crystallized and solidified into flaky solid in short time, and entanglement is accumulated between two blades, so that the phenomena of reduced pump flow and lift, low efficiency, channel blockage and the like are caused. Meanwhile, the liquid level of the polymerization kettle is reduced continuously, the pressure is gradually increased from 0.8Mpa to 0.02Mpa, and the inlet pressure of the pump is unstable, so that the phenomena of pump vibration and pump-out are obvious.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to the not enough among the above-mentioned prior art, provide a centrifugal pump that is used for PVC thick liquids S type formula of circling round blade. The centrifugal pump for the PVC slurry S-shaped rotary blade has the characteristics of novel design, low manufacturing cost and strong practicability.
The utility model provides a technical scheme that its technical problem adopted is:
a centrifugal pump for an S-shaped rotary blade made of PVC slurry comprises a pump body, an impeller, a pump cover, an impeller nut, a bearing box body, a bearing body and a pump shaft; the pump comprises a pump body, and is characterized in that the front end of the pump body is connected with a pump cover, the pump cover is fixedly connected with the pump body through a positioning pin and a bolt, the rear end of the pump cover is connected with a bearing box body, the bearing box body is fixedly connected with the pump cover through a bolt, the pump body is internally provided with an impeller, the impeller is provided with an S-shaped rotary blade, the impeller is fixedly sleeved at the left end of the pump shaft, the impeller is fixedly connected with the pump shaft through an impeller nut, the pump shaft is horizontally arranged, the right end of the pump shaft extends through the inside of the bearing box body, the pump shaft is fixedly sleeved with the bearing body through a bearing, and the bearing box body is fixedly connected with the bearing body.
Furthermore, the S-shaped rotary blade is composed of arcs with different radiuses and central angles, and two adjacent arcs are tangent.
Further, the S-shaped rotary blades include four arc blades, the four arc blades are divided into two long arc blades and two short arc blades, the two long arc blades are symmetrical about the center of the impeller, and the two short arc blades are symmetrical about the center of the impeller.
Further, the arc at the outer end of the long circular arc blade is a blade with the curvature radius of 120-130, and the arc at the inner section is a blade with the curvature radius of 160-170.
Further, the arc at the outer end of the long circular-arc blade is a blade with the curvature radius of 124.5, the arc at the inner section is a blade with the curvature radius of 164.3, and the incidence angle of the impeller inlet is designed to be 2.6 degrees through the extension of the tail end.
Furthermore, two sections of circular arcs of the S-shaped rotary blades and the impeller cover plate form a cavity, and materials can be pushed or discharged through rotation of the impeller.
Further, a plurality of back blades are symmetrically arranged on the back of the impeller.
Further, the number of the back blades is six.
Further, the back blade is of a straight sheet-shaped structure.
The blade is one of important components of the impeller, the main working area of the PVC slurry centrifugal pump is the raised blade above the rotating impeller, referring to fig. 2, fig. 2 introduces an S-shaped rotary blade on the front surface of the impeller, the S-shaped rotary impeller comprises four sections of arc blades, the four sections of arc blades are symmetrically arranged, the arc at the outer end of the impeller is the blade with the curvature radius of 124.5, the arc at the inner section is the blade with the curvature radius of 164.3, and the inlet attack angle of the impeller is designed to be 2.6 through the extension of the tail end. When a medium passes through the impeller, the conventional centrifugal pump impeller has large linear velocity difference and shear stress on the surface of a blade, PVC monomers are damaged, molecules are mutually entangled and hooked, and the PVC monomers are solidified in a pump cavity to ensure that PVC cannot uniformly pass through the impeller. Through setting up S type convolution blade to reduce the linear velocity difference of impeller excircle, thereby improve the percent of pass of medium, and reduce the purpose to the destruction degree of PVC monomer.
Referring to fig. 3, fig. 3 illustrates that the back of the impeller is provided with back vanes, and that the solids concentration step gradient is common and is caused by a variety of forces acting on the PVC, including gravity, fluid resistance, and centrifugal forces. As the slurry flows into the impeller it needs to turn through a flow angle of ninety degrees in order to be directed out of the pump, and by inertial and coriolis forces (exerted by the blades), the PVC slurry is at its highest concentration at the root of the impeller back shroud, i.e., at the side edges where the blades contact the back shroud. Through set up back blade on the impeller back shroud, reduce the drive pressure of thick liquids in the clearance, form the centrifugal force field in order to discharge the granule on blade and back shroud, this setting can reduce the drive pressure of PVC in the clearance to and form centrifugal force and reduce the drive pressure that returns the flow, make PVC concentration keep even and reduce the back side velocity of flow in the cavity and alleviate the wearing and tearing of blade root.
Referring to fig. 4, fig. 4 illustrates an impeller working surface curve I, an impeller working surface curve II, and an impeller working surface curve III.
Compared with the prior art, the utility model has the following advantage:
1. the S-shaped rotary impeller has the characteristics of axial and radial wide flow passages, and improves the condition that the flow passages are easily blocked by particles and flaky solids;
2. the S-shaped rotary blades and the impeller cover plate form a chamber, the blades can push or discharge materials each time the blades rotate, and even if a large amount of solid substances and fragile products are contained, the S-shaped rotary blades can be safely and nondestructively conveyed.
3. The back blade on the back of the impeller is used for reducing the influence on the PVC slurry chemical centrifugal pump when the inlet pressure is too high.
4, the design of the S-shaped rotary blades and the distribution of a rotary flow field are more beneficial to the uniform distribution of pressure and speed, and are more in line with the characteristics of PVC slurry; the speed difference and the shear stress of the monomers on the blade can be reduced, so that the PVC monomers cannot be damaged in the cavity, and the molecules cannot be tangled or hooked.
5. The impeller is provided with auxiliary discharge blades to reduce the driving pressure of slurry in the gap, a centrifugal force field is formed on the blades and the rear cover plate to discharge monomers, abrasion of the root parts of the blades is reduced, and PVC is enabled to uniformly pass through the impeller to reach an extrusion pipeline.
Drawings
Fig. 1 is a schematic overall structure diagram of the present invention;
fig. 2 is a schematic front structural view of the impeller of the present invention;
fig. 3 is a back structural schematic view of the impeller of the present invention;
fig. 4 is a schematic view of a part of an impeller according to the present invention;
description of reference numerals:
1-impeller nut, 2-pump body, 3-impeller, 4-pump cover, 5-bearing support, 6-bearing body, 7-pump shaft, 8-S type rotary blade, 9-impeller cover plate, 10-back blade, 11-impeller working surface curve I, 12-impeller working surface curve II, 13-impeller working surface curve III.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples:
it should be noted that the structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, and any modification of the structure, change of the ratio relationship or adjustment of the size should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the efficacy that the present invention can produce and the purpose that the present invention can achieve.
Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
A centrifugal pump for PVC slurry S-shaped rotary blades comprises a pump body 2, an impeller 3, a pump cover 4, an impeller nut 1, a bearing box body 5, a bearing body 6 and a pump shaft 7; the pump comprises a pump body 2, and is characterized in that the front end of the pump body 2 is connected with a pump cover 4, the pump cover 4 is fixedly connected with the pump body 2 through a positioning pin and a bolt, the rear end of the pump cover 4 is connected with a bearing box body 5, the bearing box body 5 is fixedly connected with the pump cover 4 through a bolt, the pump body 2 is provided with an impeller 3 in the pump cover 4, the impeller 3 is provided with an S-shaped rotary blade 8, the impeller 3 is fixedly sleeved at the left end of a pump shaft 7, the impeller 3 is fixedly connected with the pump shaft 7 through an impeller nut 1, the pump shaft 7 is horizontally arranged, the right end of the pump shaft 7 extends through the inside of the bearing box body 5, the pump shaft 7 is fixedly sleeved with the bearing body 6 through a bearing, and the bearing box body 5 is fixedly connected with.
Specifically, the S-shaped rotary blade 8 is composed of 3 sections of arcs with different radii and central angles, and two adjacent sections of arcs are tangent to each other.
Specifically, the S-shaped rotary vane 8 includes four arc-shaped vanes, which are divided into two long arc-shaped vanes and two short arc-shaped vanes, the two long arc-shaped vanes are symmetrical about the center of the impeller, and the two short arc-shaped vanes are symmetrical about the center of the impeller.
Specifically, the arc at the outer end of the long circular arc blade is a blade with the curvature radius of 120-130, and the arc at the inner section is a blade with the curvature radius of 160-170.
Specifically, the arc at the outer end of the long circular-arc blade is a blade with the curvature radius of 124.5, the arc at the inner section is a blade with the curvature radius of 164.3, and the incidence angle of an impeller inlet is designed to be 2.6 degrees through the extension of the tail end.
Specifically, two arcs of the S-shaped rotary vane 8 and the impeller cover plate 9 form a chamber, and the impeller rotates to "push" or "discharge" the material.
Specifically, the impeller 3 is provided with a plurality of back blades 10 in back symmetry.
In particular, the number of said back blades 10 is six.
In particular, the back blade 10 is of a straight-sheet configuration.
The blade is one of important components of the impeller, the main working area of the PVC slurry centrifugal pump is the raised blade above the rotating impeller, referring to fig. 2, fig. 2 introduces an S-shaped rotary blade on the front surface of the impeller, the S-shaped rotary impeller comprises four sections of arc blades, the four sections of arc blades are symmetrically arranged, the arc at the outer end of the impeller is the blade with the curvature radius of 124.5, the arc at the inner section is the blade with the curvature radius of 164.3, and the inlet attack angle of the impeller is designed to be 2.6 through the extension of the tail end. When a medium passes through the impeller, the conventional centrifugal pump impeller has large linear velocity difference and shear stress on the surface of a blade, PVC monomers are damaged, molecules are mutually entangled and hooked, and the PVC monomers are solidified in a pump cavity to ensure that PVC cannot uniformly pass through the impeller. Through setting up S type convolution blade to reduce the linear velocity difference of impeller excircle, thereby improve the percent of pass of medium, and reduce the purpose to the destruction degree of PVC monomer.
Referring to fig. 3, fig. 3 illustrates that the back of the impeller is provided with back vanes, and that the solids concentration step gradient is common and is caused by a variety of forces acting on the PVC, including gravity, fluid resistance, and centrifugal forces. As the slurry flows into the impeller it needs to turn through a flow angle of ninety degrees in order to be directed out of the pump, and by inertial and coriolis forces (exerted by the blades), the PVC slurry is at its highest concentration at the root of the impeller back shroud, i.e., at the side edges where the blades contact the back shroud. Through set up back blade on the impeller back shroud, reduce the drive pressure of thick liquids in the clearance, form the centrifugal force field in order to discharge the granule on blade and back shroud, this setting can reduce the drive pressure of PVC in the clearance to and form centrifugal force and reduce the drive pressure that returns the flow, make PVC concentration keep even and reduce the back side velocity of flow in the cavity and alleviate the wearing and tearing of blade root.
Referring to fig. 4, fig. 4 illustrates an impeller working surface curve I, an impeller working surface curve II, and an impeller working surface curve III.
The working principle is as follows: when the pump works, the driving machine is started, the pump shaft 7 drives the impeller 3 to rotate under the driving of the driving machine, and the conveyed medium enters the inlet of the impeller 3 through the inlet of the pump body 2 and is conveyed to the outlet of the pump body 2 through the outlet of the impeller 3; the S-shaped rotary blade on the impeller is used for converting mechanical energy into potential energy, the S-shaped rotary blade is composed of three circular arcs with different radiuses, pressurization is carried out through an impeller working face curve I with the highest curvature, slurry flows into the impeller, the S-shaped rotary blade needs to turn to pass through a flow angle of ninety degrees, the slurry is led out of a pump, and through inertia force and Coriolis force, the concentration of PVC slurry at the root of a back cover plate of the impeller is the highest, namely the PVC slurry has the highest concentration at the side edge of the blade, which is in contact with the back cover plate. Through set up back blade on the impeller back shroud, reduce the drive pressure of thick liquids in the clearance, form the centrifugal force field in order to discharge the granule on blade and back shroud, this setting can reduce the drive pressure of PVC in the clearance to and form centrifugal force and reduce the drive pressure that returns the flow, make PVC concentration keep even and reduce the back side velocity of flow in the cavity and alleviate the wearing and tearing of blade root.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, and that the scope of the invention is defined by the appended claims.
Claims (9)
1. A centrifugal pump for PVC thick liquids S type convolution blade which characterized in that: the pump comprises a pump body (2), an impeller (3), a pump cover (4), an impeller nut (1), a bearing box body (5), a bearing body (6) and a pump shaft (7); the pump is characterized in that the front end of the pump body (2) is connected with a pump cover (4), the pump cover (4) is fixedly connected with the pump body (2) through a positioning pin and a bolt, the rear end of the pump cover (4) is connected with the bearing box body (5), the bearing box body (5) is fixedly connected with the pump cover (4) through a bolt, the impeller (3) is arranged in the pump body (2) and the pump cover (4), the impeller (3) is provided with an S-shaped rotary blade (8) on the impeller (3), the impeller (3) is fixedly sleeved at the left end of the pump shaft (7), the impeller (3) is fixedly connected with the pump shaft (7) through the impeller nut (1), the pump shaft (7) is horizontally arranged, the right end of the pump shaft (7) extends through the bearing box body (5), and the pump shaft (7) is fixedly sleeved with the bearing body (6) through a bearing, the bearing box body (5) is fixedly connected with the bearing body (6) through bolts.
2. A centrifugal pump for S-shaped rotary blades of PVC slurry according to claim 1, characterized in that said S-shaped rotary blades (8) are composed of 3 segments of circular arcs with different radii and central angles, and adjacent two segments of circular arcs are tangent.
3. The centrifugal pump for the S-shaped rotary blade of PVC slurry according to claim 2, wherein said S-shaped rotary blade (8) comprises four segments of arc blades divided into two segments of long arc blades and two segments of short arc blades, said two segments of long arc blades being symmetrical about the center of the impeller, said two segments of short arc blades being symmetrical about the center of the impeller.
4. A centrifugal pump for PVC slurry S-shaped rotary blades as claimed in claim 3, wherein the arc at the outer end of the long circular-arc blade is a blade with a radius of curvature of 120 to 130, and the arc at the inner section is a blade with a radius of curvature of 160 to 170.
5. A centrifugal pump for S-shaped rotary blades of PVC slurry according to claim 3, wherein said long circular arc blade has a circular arc with a radius of curvature of 124.5 at the outer end and a circular arc with a radius of curvature of 164.3 at the inner end, and the impeller inlet attack angle is designed to be 2.6 ° by extending the tip.
6. The centrifugal pump for the S-shaped rotary blade of PVC slurry as claimed in claim 2 or 3, wherein the two circular arcs of the S-shaped rotary blade (8) and the impeller cover plate (9) form a chamber, and the impeller rotates to "push" or "discharge" the material.
7. The centrifugal pump for S-shaped rotary blades of PVC slurry according to claim 1, characterized in that the impeller (3) is symmetrically provided with a plurality of back blades (10) at the back.
8. Centrifugal pump for S-shaped rotary blades of PVC-slurry according to claim 7, characterized in that said back blades (10) are six in number.
9. Centrifugal pump for S-shaped rotary blades of PVC slurries according to claim 7, characterized in that the back blade (10) is of straight-sheet-shaped construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922061545.4U CN211950879U (en) | 2019-11-26 | 2019-11-26 | Centrifugal pump for S-shaped rotary blade of PVC (polyvinyl chloride) slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922061545.4U CN211950879U (en) | 2019-11-26 | 2019-11-26 | Centrifugal pump for S-shaped rotary blade of PVC (polyvinyl chloride) slurry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211950879U true CN211950879U (en) | 2020-11-17 |
Family
ID=73176813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922061545.4U Expired - Fee Related CN211950879U (en) | 2019-11-26 | 2019-11-26 | Centrifugal pump for S-shaped rotary blade of PVC (polyvinyl chloride) slurry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211950879U (en) |
-
2019
- 2019-11-26 CN CN201922061545.4U patent/CN211950879U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201117 |