CN114017317A - Screw pump service life pretesting equipment - Google Patents
Screw pump service life pretesting equipment Download PDFInfo
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- CN114017317A CN114017317A CN202111466316.6A CN202111466316A CN114017317A CN 114017317 A CN114017317 A CN 114017317A CN 202111466316 A CN202111466316 A CN 202111466316A CN 114017317 A CN114017317 A CN 114017317A
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- screw pump
- vibration
- service life
- stator
- fixed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/28—Safety arrangements; Monitoring
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a screw pump service life pre-testing device which is provided with a vibration sensor fixed on a screw pump and a flow sensor fixed on an output connecting pipe of the screw pump, wherein the vibration sensor and the flow sensor are both connected and output signals to a signal collector, and the signal collector is connected and output signals to a monitoring system. The invention relates to a single-screw pump loaded with a single-screw pump service life prediction device, which can know the abrasion conditions of a stator and a rotor of the single-screw pump in real time by means of the acquisition feedback of each sensor and overcome the defects that the traditional single-screw pump cannot predict the service life and the like.
Description
Technical Field
The invention relates to the technical field of single-screw pumps, in particular to a device for pre-testing the service life of a single-screw pump.
Background
The single screw pump belongs to a rotor type displacement pump, and is characterized by that the screw and lining are mutually meshed to produce volume change in suction cavity and discharge cavity to transfer liquid. The main working parts of the internal engaged closed screw pump are composed of a lining (stator) with a double-head spiral cavity and a single-head spiral screw (rotor) engaged with the lining in the stator cavity. When the input shaft drives the rotor to make planetary rotation around the stator center by means of universal joint, the stator and rotor pair are continuously meshed to form sealed cavities, these sealed cavities can make constant-speed axial movement, and can be used for conveying medium from suction end to discharge end, and the medium sucked into the sealed cavity can be passed through the stator, and can not be stirred and damaged. Single screw pump classification, integral stainless steel single screw pump, shaft stainless steel single screw pump.
The single-screw pump as an important conveying pump has the biggest characteristics of strong adaptability to media, stable flow, small pressure pulsation and high self-absorption capacity, is widely used in developed countries, is called as an eccentric rotor pump in Germany, and has the advantages of excellent performance, and the application range in China is rapidly expanded, so that the pump can not be replaced by any other pump. Due to the structure and the working characteristics, compared with a piston pump centrifugal pump, a vane pump and a gear pump, the centrifugal pump has many advantages, such as the capability of conveying media with high solid content; the flow is uniform, the pressure is stable, and the low rotating speed is more obvious; the flow rate is in direct proportion to the rotating speed of the pump, so that the variable flow rate control device has good variable adjustability; the pump can be used for conveying media with different viscosities; the mounting position of the pump can be inclined at will; is suitable for conveying sensitive articles and articles which are easy to be damaged by centrifugal force and the like; small volume, light weight, low noise, simple structure and convenient maintenance.
The specification of the pump is determined according to the property, flow and pressure of the liquid to be conveyed, and the rotating speed of the pump is selected by taking the viscosity and corrosivity of the liquid to be conveyed as main parameters, so that the reliable operation of the pump can be ensured.
The designed rotating speed of the pump is the highest rotating speed allowed when clean water or similar non-corrosive liquid is conveyed, and the rotating speed is generally lower than the designed rotating speed when the pump is selected due to different requirements on medium properties and service life in actual use. For high viscosity and particle-containing media, 1/2-1/3 or less of the designed rotation speed is generally adopted, the low rotation speed is beneficial to the abrasion of the pump, but after the use, the flow rate is reduced due to the abrasion of the stator, and the rotation speed can be properly increased to compensate the flow rate reduction.
According to actual requirements, the material of the rotor of the single-screw pump can be selected according to different working conditions and different conveyed media: carbon steel, stainless steel, hard chrome plated stainless steel, and the like. The rotor belongs to the flow surface of the single-screw pump to prolong the service life of the flow surface part, and the stator also belongs to a quick-wear part of the single-screw pump besides the rotor, so that the field working condition and the property of the conveyed medium are particularly considered when selecting the material of the rubber lining of the stator: nitrile rubber, ethylene propylene diene monomer, fluororubber and food-grade rubber are more applied. The reasonable selection of the material of the rubber bushing directly influences the service life of the stator of the single-screw pump. Under normal conditions, the life of the stator rubber bushing is 6-12 months. If the selection is incorrect, the liner may become wrapped and deformed or even fall directly off the steel pipe.
At present, most of single-screw pumps on the market are not provided with a service life prediction function in design, the overflowing surface of a rotor can be abraded when the single-screw pumps work continuously for a long time, and a rubber bushing of a stator can be damaged.
Disclosure of Invention
The invention aims to solve the technical problem of realizing equipment for predicting the service life of a screw pump so as to achieve the purpose of predicting the service life of the single-screw pump.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a screw pump life pre-test equipment, equipment is equipped with the vibrations sensor of fixing on the screw pump to and fix the flow sensor on the output connection pipe of screw pump, vibrations sensor and flow sensor all connect and output signal to signal collector, signal collector connects and output signal to monitoring system.
The screw pump is a single-screw pump, one end of a central shaft of the screw pump is connected with one end of a connecting shaft through a universal joint, the other end of the connecting shaft is connected with an output shaft of a servo motor through a coupler, the other end of the central shaft is connected with one end of a rotor through the universal joint, the rotor is fixed in a stator, the outer end of the stator is connected with an output connecting pipe, the other end of the stator is connected with one end of a feeding pipe, the universal joint and the central shaft are located in the feeding pipe, and the other end of the feeding pipe is provided with a sealing element hooped outside the connecting shaft.
The two ends of the stator are fixedly provided with vibration amplifiers, the vibration amplifiers are fixed on a rack for fixing the screw pump, the vibration sensors are fixed on the vibration amplifiers, and the two vibration amplifiers are respectively fixedly provided with the vibration sensors.
The vibration amplifier comprises a vibration amplification frame fixed on the frame, a connecting sleeve sleeved outside the stator and at least three obstacle avoidance devices connected with the vibration amplification frame and the connecting sleeve.
The obstacle avoidance devices are four, the inside of the vibration amplification frame is square, the outside of the connecting sleeve is square, and each inner angle of the vibration amplification frame is connected with the corresponding outer angle of the connecting sleeve through one obstacle avoidance device.
Two be connected with the horizontal pole between the vibrations amplifier, be fixed with the laser displacement sensor who gathers horizontal pole vibration range on frame, output connection pipe or the inlet pipe, laser displacement sensor connects and output signal to signal collector.
The cross rod is fixed on the connecting sleeves of the two vibration amplifiers, and the cross rod is parallel to the stator.
The invention relates to a single-screw pump loaded with a single-screw pump service life prediction device, which can know the abrasion conditions of a stator and a rotor of the single-screw pump in real time by means of the acquisition feedback of each sensor and overcome the defects that the traditional single-screw pump cannot predict the service life and the like.
Drawings
The following is a brief description of the contents of each figure and the symbols in the figures in the description of the invention:
FIG. 1 is a schematic diagram of a screw pump service life pretesting apparatus;
FIG. 2 is a schematic diagram of a screw pump life pretesting apparatus.
FIG. 3 is a structural diagram of a vibration amplifier in a screw pump service life pretesting apparatus;
the labels in the above figures are: 1. a frame; 2. an output connecting pipe; 3. a stator; 4. a vibration amplifying frame; 5. a universal joint; 6. a central shaft; 7. a seal member; 8. a connecting shaft; 9. a coupling; 10. a servo motor; 11. a rotor; 12. an obstacle avoidance device; 13. and connecting the sleeve.
Detailed Description
The following description of the embodiments with reference to the drawings is provided to describe the embodiments of the present invention, and the embodiments of the present invention, such as the shapes and configurations of the components, the mutual positions and connection relationships of the components, the functions and working principles of the components, the manufacturing processes and the operation and use methods, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the inventive concept and technical solutions of the present invention.
The screw pump service life pre-testing equipment mainly comprises a single-screw pump body, a vibration amplifier and a sensor system. The sensor system comprises a vibration sensor, a laser displacement sensor and a flow sensor, wherein each sensor is connected with and outputs a signal to a signal collector, the signal collector is connected with and outputs a signal to a monitoring system, the monitoring system is a computer, the service life of the current pump is judged through a preset program and obtained parameters, the program can be preset according to needs, comprehensive scoring is carried out through a threshold value table, and the service life of the screw pump is predicted based on scoring and table lookup.
As shown in fig. 2, the screw pump is a single-screw pump, the single-screw pump is integrally fixed on the frame 1, one end of a central shaft 6 of the screw pump is connected with one end of a connecting shaft 8 through a universal joint 5, the other end of the connecting shaft 8 is connected with an output shaft of a servo motor 10 through a coupling 9, the other end of the central shaft 6 is connected with one end of a rotor 11 through the universal joint 5, the rotor 11 is fixed in a stator 3, the outer end of the stator 3 is connected with an output connecting pipe 2, the other end of the stator 3 is connected with one end of a feeding pipe, the universal joint 5 and the central shaft 6 are positioned in the feeding pipe, the other end of the feeding pipe is provided with a sealing element 7 hooped outside the connecting shaft 8, and the flow sensor is fixed on the output connecting pipe 2 of the screw pump.
In order to improve the sensitivity of collecting vibration signals, two ends of the stator 3 are fixed with vibration amplifiers, the vibration amplifiers are fixed on the frame 1 for fixing the screw pump, the vibration sensors are fixed on the vibration amplifiers, and the two vibration amplifiers are both fixed with the vibration sensors for collecting vibration parameters at two ends of the stator 3.
As shown in fig. 3, the vibration amplifier comprises a vibration amplifying frame 4 fixed on the frame 1, a connecting sleeve 13 sleeved outside the stator 3, and an obstacle avoidance device 12 connected with the vibration amplifying frame 4 and the connecting sleeve 13, wherein the obstacle avoidance device 12 is preferably four in number, the vibration amplifying frame 4 is square in inside, the connecting sleeve 13 is square in outside, each inner angle of the vibration amplifying frame 4 is connected with the corresponding outer angle of the connecting sleeve 13 through the obstacle avoidance device 12, so that the vibration amplifier is ensured to be uniform, and the working state of the stator 3 can be reasonably reflected.
The cross rod is connected between the two vibration amplifiers and fixed on the connecting sleeve 13 of the two vibration amplifiers, the cross rod is preferably parallel to the stator 3, the laser displacement sensor for acquiring the vibration amplitude of the cross rod is fixed on the rack 1, the output connecting pipe 2 or the inlet pipe, the laser displacement sensor monitors the change of the displacement of the cross rod of the vibration amplifier in real time, and the laser displacement sensor is connected with and outputs a signal to the signal collector.
The equipment collects vibration signals, displacement signals and monitors the change of output flow, and when each collected signal is abnormal, the system can compare the signals with daily monitoring signals to prompt that the single-screw pump is abnormal.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (7)
1. The utility model provides a screw pump life pretest equipment which characterized in that: the device is provided with a vibration sensor fixed on the screw pump and a flow sensor fixed on an output connecting pipe of the screw pump, wherein the vibration sensor and the flow sensor are both connected and output signals to a signal collector, and the signal collector is connected and output signals to a monitoring system.
2. A screw pump service life pretest apparatus according to claim 1, wherein: the screw pump is a single-screw pump, one end of a central shaft of the screw pump is connected with one end of a connecting shaft through a universal joint, the other end of the connecting shaft is connected with an output shaft of a servo motor through a coupler, the other end of the central shaft is connected with one end of a rotor through the universal joint, the rotor is fixed in a stator, the outer end of the stator is connected with an output connecting pipe, the other end of the stator is connected with one end of a feeding pipe, the universal joint and the central shaft are located in the feeding pipe, and the other end of the feeding pipe is provided with a sealing element hooped outside the connecting shaft.
3. A screw pump service life pretest apparatus according to claim 2, wherein: the two ends of the stator are fixedly provided with vibration amplifiers, the vibration amplifiers are fixed on a rack for fixing the screw pump, the vibration sensors are fixed on the vibration amplifiers, and the two vibration amplifiers are respectively fixedly provided with the vibration sensors.
4. A screw pump service life pretest apparatus according to claim 3, wherein: the vibration amplifier comprises a vibration amplification frame fixed on the frame, a connecting sleeve sleeved outside the stator and at least three obstacle avoidance devices connected with the vibration amplification frame and the connecting sleeve.
5. A screw pump service life pretest apparatus according to claim 4, wherein: the obstacle avoidance devices are four, the inside of the vibration amplification frame is square, the outside of the connecting sleeve is square, and each inner angle of the vibration amplification frame is connected with the corresponding outer angle of the connecting sleeve through one obstacle avoidance device.
6. A screw pump service life pretest apparatus according to claim 5, wherein: two be connected with the horizontal pole between the vibrations amplifier, be fixed with the laser displacement sensor who gathers horizontal pole vibration range on frame, output connection pipe or the inlet pipe, laser displacement sensor connects and output signal to signal collector.
7. A screw pump service life pretest apparatus according to claim 6, wherein: the cross rod is fixed on the connecting sleeves of the two vibration amplifiers, and the cross rod is parallel to the stator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111466316.6A CN114017317A (en) | 2021-12-03 | 2021-12-03 | Screw pump service life pretesting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111466316.6A CN114017317A (en) | 2021-12-03 | 2021-12-03 | Screw pump service life pretesting equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114017317A true CN114017317A (en) | 2022-02-08 |
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ID=80067649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111466316.6A Pending CN114017317A (en) | 2021-12-03 | 2021-12-03 | Screw pump service life pretesting equipment |
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| Country | Link |
|---|---|
| CN (1) | CN114017317A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001088379A1 (en) * | 2000-05-19 | 2001-11-22 | Netzsch-Mohnopumpen Gmbh | Method and device for operating a screw pump |
| US7308322B1 (en) * | 1998-09-29 | 2007-12-11 | Rockwell Automation Technologies, Inc. | Motorized system integrated control and diagnostics using vibration, pressure, temperature, speed, and/or current analysis |
| CN101870075A (en) * | 2010-07-02 | 2010-10-27 | 西南交通大学 | Method for predicting service life of screw pair of numerical control machine on basis of performance degradation model |
| CN206458592U (en) * | 2017-01-13 | 2017-09-01 | 扬州大学 | A kind of single-screw pump |
| US20200362839A1 (en) * | 2019-05-15 | 2020-11-19 | Leistritz Pumpen Gmbh | Method for determining a flow volume of a fluid delivered by a pump |
-
2021
- 2021-12-03 CN CN202111466316.6A patent/CN114017317A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7308322B1 (en) * | 1998-09-29 | 2007-12-11 | Rockwell Automation Technologies, Inc. | Motorized system integrated control and diagnostics using vibration, pressure, temperature, speed, and/or current analysis |
| WO2001088379A1 (en) * | 2000-05-19 | 2001-11-22 | Netzsch-Mohnopumpen Gmbh | Method and device for operating a screw pump |
| CN101870075A (en) * | 2010-07-02 | 2010-10-27 | 西南交通大学 | Method for predicting service life of screw pair of numerical control machine on basis of performance degradation model |
| CN206458592U (en) * | 2017-01-13 | 2017-09-01 | 扬州大学 | A kind of single-screw pump |
| US20200362839A1 (en) * | 2019-05-15 | 2020-11-19 | Leistritz Pumpen Gmbh | Method for determining a flow volume of a fluid delivered by a pump |
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