CN211144818U - Double-shell sectional type multistage centrifugal pump - Google Patents
Double-shell sectional type multistage centrifugal pump Download PDFInfo
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- CN211144818U CN211144818U CN201921353754.XU CN201921353754U CN211144818U CN 211144818 U CN211144818 U CN 211144818U CN 201921353754 U CN201921353754 U CN 201921353754U CN 211144818 U CN211144818 U CN 211144818U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 5
- 239000003921 oil Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a two casing festival segmentation multistage centrifugal pump, include the pump barrel and be located pump core in the pump barrel, the pump core includes pump shaft, a plurality of impeller, stator, middle section and last stage stator, and is a plurality of the impeller all with pump shaft interference fit connects, and each the impeller is in through the snap ring respectively location on the pump shaft, the last stage stator sets up the one end of pump shaft and with the middle section is connected, is close to the last stage stator still the cover is equipped with balanced drum mechanism on the pump shaft, wherein, at each there is guide vane and middle section to be connected with respectively in the radial outer fringe of impeller, the stator mouth ring of stator with the hardness of the middle section mouth ring in middle section is less than the impeller mouth ring of impeller. Wherein, the hardness of the stator opening ring and the middle section opening ring of the guide vane is less than that of the impeller opening ring of the impeller, so that the impeller can be effectively prevented from being damaged, and the stability of the multistage centrifugal pump is improved.
Description
Technical Field
The utility model relates to a hydraulic mechanical equipment, specifically speaking are two casing festival segmentation multistage centrifugal pump.
Background
The boiler feed pump is an important auxiliary equipment of the thermal power station, bears an important task of supplying water to a boiler system, and plays an important role in stable and efficient operation of the whole power station. With the high-speed development of the power industry in China, the requirements of users on boiler feed pumps are higher and higher, and especially the requirements on the lift of medium and small boiler feed pumps are generally higher under medium and low flow.
Because the water pump manufacturing enterprise is based on the principle of saving cost and simple structure, the double-shell segment type multistage centrifugal pump is generally adopted to operate at high speed, the occupied area of the pump set is large under the configuration, and the workload of adjustment and maintenance of the pump set is greatly increased due to the arrangement of the speed increasing box or the hydraulic coupler, so that the boiler feed pump which operates at power frequency and has medium and low flow and high lift needs to be developed urgently. In addition, with the increasing of the outlet pressure of the boiler feed pump, a small-gap high-pressure-drop balancing device is required to be arranged to balance the main axial force, and whether the bearing arranged on the pump can meet the requirement of instantaneous reversal or not is required. The current balancing device generally adopts a balancing drum or a balancing disc, so that the leakage amount is increased under the condition of high pressure drop, and the efficiency of the pump is reduced. The above three problems are the problems to be solved urgently by each water pump manufacturing enterprise to meet the requirements of users.
SUMMERY OF THE UTILITY MODEL
To the weak point that above-mentioned prior art exists, the utility model provides a two casing festival segmentation multistage centrifugal pump has solved the problem of the multistage centrifugal pump poor stability among the prior art.
The purpose of the utility model is realized through the following technical scheme: the utility model provides a two casing festival segmentation multistage centrifugal pump, includes the pump barrel and is located pump core in the pump barrel, the pump core includes pump shaft, a plurality of impeller, stator, middle section and last stage stator, and is a plurality of the impeller all with pump shaft interference fit connects, and each the impeller is in through the snap ring respectively location on the pump shaft, last stage stator sets up the one end of pump shaft and with the middle section is connected, is close to the last stage stator still the cover is equipped with balance drum mechanism on the pump shaft, wherein, each all be connected with stator and middle section on the radial outer fringe of impeller, the stator mouth ring of stator with the hardness of the middle section mouth ring in middle section is less than the impeller mouth ring of impeller.
Furthermore, a drive end bearing body and a non-drive end bearing body are respectively arranged at two ends of the pump shaft, the drive end bearing body is arranged on a drive end bearing bracket of the pump cylinder body, and the non-drive end bearing body is arranged on a non-drive end bearing bracket of the pump cylinder body, so that the pump shaft is supported; the driving end bearing body and the non-driving end bearing body are internally provided with radial bearing bushes respectively, and the non-driving end bearing body is internally provided with a thrust bearing bush.
Furthermore, four oil wedges of the radial bearing bush are arranged in a central symmetry mode, and each oil wedge is in a sector shape in axial symmetry.
Furthermore, the pump cylinder body is sequentially provided with a suction inlet, a tap opening and a discharge opening, the processing spigot of the suction inlet is fixedly connected with the inlet connecting pipe, the processing spigot of the tap opening is fixedly connected with the tap connecting pipe, and the processing spigot of the discharge opening is fixedly connected with the outlet connecting pipe.
Furthermore, one end of the pump cylinder body, which is close to the balance drum mechanism, is fixedly connected with the pump cover through a double-end bolt and a nut.
Further, a winding pad is arranged between the final stage guide vane and the pump cover.
Furthermore, the pump cover positioned at the outer edge of the balance drum mechanism is communicated with one end of a balance water pipe, and the other end of the balance water pipe is communicated with the suction inlet.
Furthermore, the two adjacent middle sections are sealed in a direct contact mode, and the roughness of a contact surface between the two adjacent middle sections is more than 1.6.
The utility model provides a two casing festival segmentation multistage centrifugal pump, include the pump barrel and be located pump core in the pump barrel, the pump core includes pump shaft, a plurality of impeller, stator, middle section and last stage stator, and is a plurality of the impeller all with pump shaft interference fit connects, and each the impeller is in through the snap ring respectively location on the pump shaft, the last stage stator sets up the one end of pump shaft and with the middle section is connected, is close to the last stage stator still the cover is equipped with balanced drum mechanism on the pump shaft, wherein, at each there is guide vane and middle section to be connected with respectively in the radial outer fringe of impeller, the stator mouth ring of stator with the hardness of the middle section mouth ring in middle section is less than the impeller mouth ring of impeller. Wherein, the hardness of the stator opening ring and the middle section opening ring of the guide vane is less than that of the impeller opening ring of the impeller, so that the impeller can be effectively prevented from being damaged, and the stability of the multistage centrifugal pump is improved.
Drawings
The overall structural features and the specific advantages of the present invention can be better understood through the visual presentation of the drawings and the following detailed description, but the drawings herein are only a further explanation of the present invention, constituting a part of the present invention, and do not constitute an undue limitation of the present invention, as illustrated in the drawings wherein:
fig. 1 is a cross-sectional view of a dual-casing segmented multistage centrifugal pump according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic diagram of a pump cartridge according to an exemplary embodiment of the present invention;
fig. 3 is a cross-sectional view of a radial bearing shell according to an exemplary embodiment of the present invention.
In the figure: 1. a drive end bearing body 1.1 and a radial bearing bush;
2. a drive end bearing bracket;
3. the pump comprises a pump cylinder body, 3.1, a suction inlet, 3.2, a tap port, 3.3, a discharge port, 3.4, an inlet connecting pipe, 3.5, a tap connecting pipe, 3.6, an outlet connecting pipe and 3.7, and a balance water pipe;
4. 4.1 pump core, 4.1 impeller, 4.2 pump shaft, 4.3 snap ring, 4.4 guide vane, 4.5 middle section, 4.6 guide vane opening ring, 4.7 middle section opening ring, 4.8 impeller opening ring, 4.9 balance drum mechanism, 4.10 last stage guide vane, 4.11 screw, 4.12 pin, 4.13 winding pad;
5. a pump cover 5.1, a stud bolt 5.2 and a nut;
6. a non-drive end bearing bracket, 6.1, a thrust bearing bush;
7. a non-drive end bearing body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1 and 2, a double-casing segment type multistage centrifugal pump includes a pump cylinder 3 and a pump core 4 located in the pump cylinder 3, the pump core 4 includes a pump shaft 4.2, a plurality of impellers 4.1, guide vanes 4.4, a middle section 4.5 and a last stage guide vane 4.10, the plurality of impellers 4.1 are all connected with the pump shaft 4.2 in interference fit, and each impeller 4.1 is positioned on the pump shaft 4.2 through a snap ring 4.3, the last stage guide vane 4.10 is arranged at one end of the pump shaft 4.2 and connected with the middle section 4.5, a balance drum mechanism 4.9 is further sleeved on the pump shaft 4.2 close to the last stage guide vane 4.10, wherein each impeller 4.1 is connected with a guide vane 4.4 and a middle section 4.5 on a radial outer edge, and an impeller with a guide vane ring 4.6 of the guide vane 4.4 and an impeller ring 4.7 of the middle section 4.5 has a hardness smaller than 4.8 of the guide vane 4.1. The pump shaft 4.2, the impellers 4.1, the guide vanes 4.4 and the final stage guide vanes 4.10 are connected into a whole by a plurality of screws 4.11 and pins 4.12, and the impellers 4.1 and the guide vanes 4.4, the impellers 4.1 and the middle section 4.5 are sealed by metal surfaces; the material of the guide vane opening ring 4.6 and the middle section opening ring 4.7 is 1Cr13MoS, and the material of the impeller opening ring 4.8 is S203.
As a preferred embodiment, two ends of the pump shaft 4.2 are respectively provided with a driving-end bearing body 1 and a non-driving-end bearing body 7, the driving-end bearing body 1 is installed on the driving-end bearing bracket 2 of the pump cylinder 3, and the non-driving-end bearing body 7 is installed on the non-driving-end bearing bracket 6 of the pump cylinder 3, so that the pump shaft 4.2 is supported; the driving end bearing body 1 and the non-driving end bearing body 7 are internally provided with radial bearing bushes 1.1 respectively, the non-driving end bearing body 7 is internally provided with thrust bearing bushes 6.1, and the arrangement of the radial bearing bushes 1.1 and the thrust bearing bushes 6.1 can balance residual axial force on the non-driving end bearing body 7.
As a preferred embodiment, as shown in fig. 3, the four oil wedges of the radial bearing shell 1.1 are arranged in a central symmetry manner, and each oil wedge is in a sector shape with axial symmetry. The structure of the radial bearing bush 1.1 can ensure that the bearing is installed correctly in any direction, and the problem that lubricating oil cannot enter a bearing gap due to reverse installation of the bearing is avoided.
As a preferred embodiment, the pump cylinder 3 is sequentially provided with a suction inlet 3.1, a tap 3.2 and a discharge outlet 3.3, a processing spigot of the suction inlet 3.1 is fixedly connected with an inlet connecting pipe 3.4, a processing spigot of the tap 3.2 is fixedly connected with a tap connecting pipe 3.5, and a processing spigot of the discharge outlet 3.3 is fixedly connected with an outlet connecting pipe 3.6.
In a preferred embodiment, one end of the pump cylinder 3 close to the balance drum mechanism 4.9 is fixedly connected with the pump cover 5 through a stud bolt 5.1 and a nut 5.2.
As a preferred embodiment, a winding mat 4.13 is provided between the last stage guide vane 4.10 and the pump cover 5, the winding mat 4.13 being able to act as a thermal expansion compensator.
As a preferred embodiment, the pump cover 5 positioned at the outer edge of the balance drum mechanism 4.9 is communicated with one end of the balance water pipe 3.7, and the other end of the balance water pipe 3.7 is communicated with the suction inlet 3.1, so that the high-temperature and high-pressure medium positioned at the outer edge of the balance drum mechanism 4.9 is communicated with the medium of the suction inlet 3.1 through the balance water pipe 3.7, and a force opposite to the axial force is formed to offset most of the axial force.
As a preferred embodiment, the two adjacent middle sections 4.5 are in direct contact sealing, and the roughness of the contact surface between the two adjacent middle sections 4.5 is more than 1.6.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The utility model provides a two casing festival segmentation multistage centrifugal pump, its characterized in that, includes the pump barrel and is located pump core in the pump barrel, the pump core includes pump shaft, a plurality of impeller, stator, middle section and last stage stator, and is a plurality of the impeller all with pump shaft interference fit connects, and each the impeller is in through the snap ring respectively location on the pump shaft, the last stage stator sets up the one end of pump shaft and with the middle section is connected, is close to the last stage stator still the cover is equipped with balanced drum mechanism on the pump shaft, wherein, each all be connected with stator and middle section on the radial outer fringe of impeller, the stator mouth ring of stator with the hardness of the middle section mouth ring of middle section is less than the impeller mouth ring of impeller.
2. The double-casing segment type multistage centrifugal pump according to claim 1, wherein a drive-end bearing body and a non-drive-end bearing body are respectively disposed at two ends of the pump shaft, the drive-end bearing body is mounted on a drive-end bearing bracket of the pump cylinder body, and the non-drive-end bearing body is mounted on a non-drive-end bearing bracket of the pump cylinder body, so that the pump shaft is supported; the driving end bearing body and the non-driving end bearing body are internally provided with radial bearing bushes respectively, and the non-driving end bearing body is internally provided with a thrust bearing bush.
3. The double-casing-segment-type multistage centrifugal pump as claimed in claim 2, wherein the four oil wedges of the radial bearing shell are arranged in a central symmetry manner, and each oil wedge is in a sector shape of axial symmetry.
4. The double-casing segment type multistage centrifugal pump as claimed in claim 1, wherein the pump cylinder is sequentially provided with a suction inlet, a tap port and a discharge port, the processing spigot of the suction inlet is fixedly connected with the inlet connection pipe, the processing spigot of the tap port is fixedly connected with the tap connection pipe, and the processing spigot of the discharge port is fixedly connected with the outlet connection pipe.
5. The sectional multistage centrifugal pump of claim 4, wherein the end of the pump cylinder near the balance drum mechanism is fixedly connected with the pump cover through a double-ended bolt and a nut.
6. A double casing segment type multistage centrifugal pump according to claim 5, characterized in that a winding pad is provided between the last stage guide vane and the pump cover.
7. The double-casing segmented multistage centrifugal pump as claimed in claim 5, wherein the pump cover located at the outer edge of the balance drum mechanism is communicated with one end of a balance water pipe, and the other end of the balance water pipe is communicated with the suction port.
8. The double-casing segment-type multistage centrifugal pump according to any one of claims 1 to 7, wherein a direct contact seal is adopted between two adjacent intermediate sections, and the roughness of the contact surface between two adjacent intermediate sections is more than 1.6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921353754.XU CN211144818U (en) | 2019-08-20 | 2019-08-20 | Double-shell sectional type multistage centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921353754.XU CN211144818U (en) | 2019-08-20 | 2019-08-20 | Double-shell sectional type multistage centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211144818U true CN211144818U (en) | 2020-07-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921353754.XU Active CN211144818U (en) | 2019-08-20 | 2019-08-20 | Double-shell sectional type multistage centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211144818U (en) |
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2019
- 2019-08-20 CN CN201921353754.XU patent/CN211144818U/en active Active
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