CN110725801A - Direct-coupled centrifugal pump - Google Patents
Direct-coupled centrifugal pump Download PDFInfo
- Publication number
- CN110725801A CN110725801A CN201911142817.1A CN201911142817A CN110725801A CN 110725801 A CN110725801 A CN 110725801A CN 201911142817 A CN201911142817 A CN 201911142817A CN 110725801 A CN110725801 A CN 110725801A
- Authority
- CN
- China
- Prior art keywords
- pump
- mechanical seal
- centrifugal pump
- shaft
- cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor 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
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/043—Shafts
- F04D29/044—Arrangements for joining or assembling shafts
-
- 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
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/106—Shaft sealings especially adapted for liquid pumps
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/5886—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling by injection
Abstract
The invention relates to a direct-coupled centrifugal pump, which comprises a pump body, an impeller, a pump cover, a pump shaft, a mechanical seal, a motor and a mechanical seal cooling assembly, wherein a pump cavity is enclosed between the pump body and the pump cover, the impeller is arranged in the pump cavity, an output shaft of the motor is used as the pump shaft of the centrifugal pump, one end of the pump shaft penetrates through the pump cover and is fixedly connected with the impeller, the mechanical seal is arranged on the pump shaft and is fixedly connected with the pump cover, and the mechanical seal cooling assembly is respectively communicated with a liquid inlet and a liquid outlet of the centrifugal pump and cools the mechanical seal through fluid in. Compared with the prior art, the centrifugal pump has the advantages of long service life, safety, reliability, simple structure, easy installation, no maintenance, suitability for medium-small flow low-lift working conditions in various fields, and capability of cooling the mechanical seal through circularly conveyed fluid and avoiding leakage caused by overheating deformation of the mechanical seal.
Description
Technical Field
The invention belongs to the technical field of centrifugal pumps, and relates to a direct-connected centrifugal pump.
Background
At present, a motor and a pump head of the centrifugal pump are in transmission connection through a coupler, and a bearing box is required to be additionally arranged to support a pump shaft at the pump head end. In order to keep the normal work of the bearing box, workers are required to overhaul and supplement oil lubrication to the bearings in the bearing box regularly. In addition, when the pump shaft rotates at a high speed, certain friction heat can be generated between the pump shaft and the mechanical seal, and if the heat cannot be dissipated in time, the accumulated heat can cause the heat deformation of the sealing surface, so that the leakage or the damage of the mechanical seal are caused. Therefore, how to cool down the mechanical seal to a reasonable area is the key to ensure the long-term stable operation of the mechanical seal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a direct-coupled centrifugal pump which is used for cooling a mechanical seal in time through conveying liquid so as to avoid the condition that the mechanical seal is damaged by heating and causes leakage.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides an associated mode centrifugal pump, includes the pump body, impeller, pump cover, pump shaft, mechanical seal, motor and mechanical seal cooling module, the pump body and pump cover between enclose into the pump chamber, the impeller locate the pump intracavity, the output shaft of motor as the pump shaft of centrifugal pump, the one end of pump shaft pass the pump cover and with impeller fixed connection, mechanical seal cover locate on the pump shaft and with pump cover fixed connection, mechanical seal cooling module be linked together with the inlet and the liquid outlet of centrifugal pump respectively to fluid through in the mechanical seal cooling module makes the mechanical seal cooling.
Through directly installing the impeller in the one end of motor output shaft, the transmission efficiency of motor has been improved to demolish the bearing box, thereby avoid the maintenance and the maintenance to the bearing box, the fluid that will flow from the liquid outlet through the pump cover that contacts with mechanical seal through mechanical seal cooling module and the output pressure that relies on the pump in addition returns to the inlet again, realizes the partition wall type heat transfer to mechanical seal, thereby reaches the purpose to mechanical seal cooling.
Furthermore, a connecting frame is arranged between the pump body and the motor, and the pump body is fixedly connected with the motor through the connecting frame. The two sides of the connecting frame are respectively fixedly connected with the motor and the pump body through bolts, and the compactness and the stability of the overall structure of the centrifugal pump are improved through the connecting frame.
Furthermore, the edge of the pump cover is arranged between the pump body and the connecting frame in an embedded mode, and the pump cover is fixedly connected with the pump body through the connecting frame. The pump cover is tightly pressed on the pump body through the connecting frame, so that the sealing property between the pump cover and the pump body is improved.
Furthermore, the pump cover is provided with a mechanical seal gland, the edge of the mechanical seal is embedded between the mechanical seal gland and the pump cover, and the mechanical seal is fixedly connected with the pump cover through the mechanical seal gland.
Furthermore, a shaft sleeve is arranged on the back of the impeller, and one end of the pump shaft extends into the shaft sleeve and is fixedly connected with the impeller through a bolt.
Furthermore, the inner wall of the shaft sleeve is provided with a limit groove, and the end part of the pump shaft is provided with a limit key matched with the limit groove. The transmission efficiency of the motor is ensured through the matching of the limiting key and the limiting groove.
Furthermore, the mechanical seal cooling assembly comprises an upper return pipe, a cooling pipe, a lower return pipe and a return box which are sequentially communicated;
one end of the upper return pipe is communicated with a liquid outlet pipe of the centrifugal pump, and the other end of the upper return pipe passes through the connecting frame and is communicated with the cooling pipe;
the cooling pipe is embedded in the pump cover in a snake shape;
one end of the lower return pipe is communicated with the cooling pipe, and the other end of the lower return pipe passes through the connecting frame and is communicated with the return tank;
the reflux box is arranged on a liquid inlet pipe of the centrifugal pump and is communicated with the liquid inlet pipe.
Because the outlet pressure of centrifugal pump is higher than inlet pressure for in the partial fluid that flows from the centrifugal pump liquid outlet returns the centrifugal pump through last back flow, and flow in the cooling tube of inlaying in locating the pump cover, through the next door heat transfer, take away mechanical seal because of the heat that the friction produced, thereby reach the effect of cooling, fluid after the heat transfer flows into the return tank through lower back flow, gets into the centrifugal pump from the inlet of centrifugal pump again.
Furthermore, the upper return pipe is also provided with a flow regulating valve, the return box is also provided with a pressure regulating valve, the bottom of the return box is provided with a liquid inlet and a liquid outlet, and the return box is respectively communicated with the liquid inlet pipe through the liquid inlet and the liquid outlet.
The liquid flowing in the mechanical seal cooling assembly is controlled through the flow regulating valve, so that the cooling effect of the mechanical seal is controlled. The pressure in the return tank is controlled by the pressure regulating valve, so that the fluid in the lower return pipe can smoothly enter the return tank.
The working principle is as follows: this centrifugal pump is through directly installing the impeller in the one end of motor output shaft, the transmission efficiency of motor has been improved, and the bearing box has been demolishd, thereby avoid the maintenance and the maintenance to the bearing box, in addition through mechanical seal cooling module and the output pressure who relies on the pump, make from the partial fluid of centrifugal pump liquid outlet outflow return to in the centrifugal pump in last back flow, and flow in the cooling tube of inlaying in locating the pump cover, through the next door heat transfer, take away mechanical seal because of the heat that the friction produced, thereby reach cooling's effect, fluid after the heat transfer joins in the liquid in the back flow box and with the feed liquor pipe through back flow inflow down, get into the centrifugal pump from the inlet of centrifugal pump again.
Compared with the prior art, the invention has the following characteristics:
1) the service life is long: the pump shaft is stressed uniformly, has high strength and is not easy to bend and deform;
2) safe and reliable: a mechanical sealing device is adopted;
3) the application range is wide: the method is suitable for the working conditions of small flow and low lift in various fields;
4) the structure is simple: the centrifugal pump bearing-box-free device is easy to install and maintenance-free;
5) the mechanical seal is cooled by the circularly conveyed fluid, so that leakage caused by overheating deformation of the mechanical seal is avoided.
Drawings
FIG. 1 is a schematic structural view of a direct-coupled centrifugal pump according to the present invention;
FIG. 2 is a schematic structural diagram of a direct-coupled centrifugal pump according to an embodiment;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
the notation in the figure is:
1-pump body, 2-impeller, 3-pump cover, 4-pump shaft, 5-mechanical seal, 6-motor, 7-connecting frame, 8-shaft sleeve, 9-upper return pipe, 10-lower return pipe, 11-return box, 12-pressure regulating valve, 13-cooling pipe and 14-mechanical seal gland.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example (b):
a direct-coupled centrifugal pump as shown in fig. 1, which comprises a pump body 1, an impeller 2, a pump cover 3, a pump shaft 4, a mechanical seal 5 and a motor 6, wherein a pump cavity is enclosed between the pump body 1 and the pump cover 3, the impeller 2 is arranged in the pump cavity, an output shaft of the motor 6 is used as the pump shaft 4 of the centrifugal pump, one end of the pump shaft 4 penetrates through the pump cover 3 and is fixedly connected with the impeller 2, the mechanical seal 5 is sleeved on the pump shaft 4 and is fixedly connected with the pump cover 3, a mechanical seal cooling assembly is respectively communicated with a liquid inlet and a liquid outlet of the centrifugal pump, and the mechanical seal 5 is cooled by fluid in the.
Wherein, be equipped with link 7 between pump body 1 and motor 6, pump body 1 passes through link 7 and motor 6 fixed connection. The edge of the pump cover 3 is embedded between the pump body 1 and the connecting frame 7, and the pump cover 3 is fixedly connected with the pump body 1 through the connecting frame 7. The pump cover 3 is provided with a mechanical seal gland 14, the edge of the mechanical seal 5 is embedded between the mechanical seal gland 14 and the pump cover 3, and the mechanical seal 5 is fixedly connected with the pump cover 3 through the mechanical seal gland 14.
The back of the impeller 2 is provided with a shaft sleeve 8, and one end of the pump shaft 4 extends into the shaft sleeve 8 and is fixedly connected with the impeller 2 through a bolt. The inner wall of the shaft sleeve 8 is provided with a limit groove, and the end part of the pump shaft 4 is provided with a limit key matched with the limit groove.
As shown in fig. 2, the mechanical seal cooling assembly includes an upper return pipe 9, a cooling pipe 13, a lower return pipe 10 and a return tank 11 which are communicated in sequence.
As shown in fig. 3, one end of the upper return pipe 9 is communicated with a liquid outlet pipe of the centrifugal pump, and the other end thereof passes through the connecting frame 7 and is communicated with a cooling pipe 13; the cooling pipe 13 is embedded in the pump cover 3; one end of the lower return pipe 10 is communicated with the cooling pipe 13, and the other end of the lower return pipe passes through the connecting frame 7 and is communicated with the return tank 11; the return tank 11 is arranged on a liquid inlet pipe of the centrifugal pump and communicated with the liquid inlet pipe, the upper return pipe 9 is also provided with a flow regulating valve, the return tank 11 is also provided with a pressure regulating valve 12, the bottom of the return tank 11 is provided with a liquid inlet and a liquid outlet, and the return tank 11 is respectively communicated with the liquid inlet pipe through the liquid inlet and the liquid outlet.
The working principle is as follows: this centrifugal pump is through directly installing impeller 2 in the one end of 6 output shafts of motor, the transmission efficiency of motor 6 has been improved, and the bearing box has been demolishd, thereby avoid the maintenance and the maintenance to the bearing box, in addition through mechanical seal cooling module and the output pressure who relies on the centrifugal pump, make from the partial fluid of centrifugal pump liquid outlet outflow return to in the centrifugal pump in last back flow 9, and flow in inlaying the cooling tube 13 of locating in pump cover 3, through the next door heat transfer, take away mechanical seal 5 because of the heat that the friction produced, thereby reach cooling's effect, fluid after the heat transfer joins in the liquid that flows in back flow box 11 and in the feed liquor pipe through back flow 10 down, get into the centrifugal pump from the inlet of centrifugal pump again.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (8)
1. The utility model provides a direct-coupled centrifugal pump, its characterized in that, this centrifugal pump includes the pump body (1), impeller (2), pump cover (3), pump shaft (4), mechanical seal (5), motor (6) and mechanical seal cooling module, the pump body (1) and pump cover (3) between enclose into the pump chamber, impeller (2) locate the pump chamber in, the output shaft of motor (6) as pump shaft (4) of centrifugal pump, the one end of pump shaft (4) pass pump cover (3) and with impeller (2) fixed connection, mechanical seal (5) cover locate on pump shaft (4) and with pump cover (3) fixed connection, mechanical seal cooling module be linked together with the inlet and the liquid outlet of centrifugal pump respectively to make the mechanical seal cooling through the fluid in the mechanical seal cooling module.
2. A centrifugal pump of the associated type according to claim 1, characterized in that a coupling frame (7) is provided between the pump body (1) and the motor (6), and the pump body (1) is fixedly connected to the motor (6) via the coupling frame (7).
3. The direct-coupled centrifugal pump according to claim 2, wherein the edge of the pump cover (3) is embedded between the pump body (1) and the coupling frame (7), and the pump cover (3) is fixedly connected with the pump body (1) through the coupling frame (7).
4. The direct-coupled centrifugal pump according to claim 1, wherein the pump cover (3) is provided with a mechanical seal gland (14), the edge of the mechanical seal (5) is embedded between the mechanical seal gland (14) and the pump cover (3), and the mechanical seal (5) is fixedly connected with the pump cover (3) through the mechanical seal gland (14).
5. A centrifugal pump of the direct-coupled type according to claim 1, characterized in that a shaft sleeve (8) is provided on the back of the impeller (2), and one end of the pump shaft (4) is inserted into the shaft sleeve (8) and is fixedly connected with the impeller (2) by a bolt.
6. The direct-coupled centrifugal pump according to claim 5, wherein the inner wall of the shaft sleeve (8) is provided with a limit groove, and the end of the pump shaft (4) is provided with a limit key matched with the limit groove.
7. The direct-coupled centrifugal pump according to claim 1, wherein the mechanical seal cooling assembly comprises an upper return pipe (9), a cooling pipe (13), a lower return pipe (10) and a return tank (11) which are communicated in sequence;
one end of the upper return pipe (9) is communicated with a liquid outlet pipe of the centrifugal pump;
the cooling pipe (13) is embedded in the pump cover (3);
the reflux box (11) is arranged on a liquid inlet pipe of the centrifugal pump and is communicated with the liquid inlet pipe.
8. The centrifugal pump of claim 7, wherein the upper return pipe (9) is further provided with a flow control valve, the return tank (11) is further provided with a pressure regulating valve (12), the bottom of the return tank (11) is provided with a liquid inlet and a liquid outlet, and the return tank (11) is respectively communicated with the liquid inlet pipe through the liquid inlet and the liquid outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911142817.1A CN110725801A (en) | 2019-11-20 | 2019-11-20 | Direct-coupled centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911142817.1A CN110725801A (en) | 2019-11-20 | 2019-11-20 | Direct-coupled centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110725801A true CN110725801A (en) | 2020-01-24 |
Family
ID=69224632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911142817.1A Pending CN110725801A (en) | 2019-11-20 | 2019-11-20 | Direct-coupled centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110725801A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113969895A (en) * | 2021-11-25 | 2022-01-25 | 安徽岳泉泵业制造有限公司 | Centrifugal pump, centrifugal pump assembly and production and use methods thereof |
-
2019
- 2019-11-20 CN CN201911142817.1A patent/CN110725801A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113969895A (en) * | 2021-11-25 | 2022-01-25 | 安徽岳泉泵业制造有限公司 | Centrifugal pump, centrifugal pump assembly and production and use methods thereof |
| CN113969895B (en) * | 2021-11-25 | 2023-07-14 | 安徽岳泉泵业制造有限公司 | Centrifugal pump, centrifugal pump assembly and production and use methods thereof |
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