A centrifugal pump fault detector

Abstract

The present invention provides a centrifugal pump fault detector, which includes a detector body, a centrifugal impeller and a motor. The detector body comprises a controller, a docking mechanism, a first detection module and a second detection module. A quantitative cavity is installed at the top of the controller, and the top of the quantitative cavity is partially connected to the first detection module. A support sleeve is arranged on the side of the first detection module, and the support sleeve is installed on one side of the pump casing. The other side of the pump casing is connected with a water inlet pipe, and the top of the pump casing is provided with a water outlet pipe. The centrifugal pump fault detector is provided with a collection hole at the front end of the pump shaft, and the liquid is led out and collected from the inside of the pump shaft through the collection hole, so as to realize the detection process of the sealing condition. It is driven by the docking mechanism at the rear end, and the end of the driving shaft ensures that all the liquid can be pumped out and conveyed during operation, improving the connection stability and the sealing performance inside the detection pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pump maintenance, and specifically to a centrifugal pump fault detector. Background Art

[0002] The centrifugal pump uses the rotation of the impeller to make water undergo centrifugal motion to achieve the conveying work. When the water pump is running, the pump shaft drives the impeller and water to do high-speed rotational motion through the motor. The water undergoes centrifugal motion and is thrown towards the outer edge of the impeller, and then flows into the pressure water pipeline of the water pump through the flow channel inside the pump casing.

[0003] When the centrifugal pump is in a high-pressure and high-flow rate operating state for a long time, it is extremely easy for the centrifugal impeller part inside to be worn. After wear, it will cause a large amplitude of vibration in the entire centrifugal pump. Being in this state for a long time will increase the equipment operation resistance and failure rate. Therefore, it needs to be regularly maintained and detected. In the prior art, vibration sensors and temperature sensors and other devices are installed inside the centrifugal pump to detect it. However, such solutions can only detect the overall operating state of the centrifugal pump, and cannot determine whether the specific worn area is on the pump casing or the centrifugal impeller. The accuracy of measuring the specific fault location is insufficient, and at the same time, the specific temperature of different centrifugal impellers inside cannot be measured. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a centrifugal pump fault detector to solve the problems proposed in the above background art. The present invention can detect the sealing state, vibration condition and operating temperature of the centrifugal pump, improve the accurate positioning of the fault location, and facilitate the subsequent maintenance work.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions: A centrifugal pump fault detector includes a detector body, a centrifugal impeller and a motor. The detector body includes a controller, a docking mechanism, a first detection module and a second detection module. A quantitative cavity is installed on the top of the controller. The top of the quantitative cavity is partially connected to the first detection module. A support sleeve is arranged on the side of the first detection module. The support sleeve is installed on one side of the pump casing. The other side of the pump casing is connected to a water inlet pipe. The top of the pump casing is provided with a water outlet pipe. The centrifugal impeller is installed inside the pump casing. A second detection module is arranged on the side of the pump casing. A docking mechanism is arranged on the side of the first detection module. The middle of the docking mechanism is connected to a drive shaft. One end of the drive shaft is connected to the output end of the motor. The second detection module is connected to the inside of the controller through a signal line.

[0006] Further, a pump shaft is inserted through the central position of the pump casing. The rear end of the centrifugal impeller is integrally fixed to the side of the end of the pump shaft. A docking sleeve is installed at the end of the pump shaft, and a keyway is provided inside the docking sleeve.

[0007] Further, a collection hole is provided at the end of the pump shaft, a lead-out hole is provided on the surface of the docking sleeve, the inside of the pump shaft is of a hollow structure, and the collection hole communicates with the inside of the lead-out hole through the inside of the pump shaft.

[0008] Further, the docking mechanism includes a first flange and a second flange. The first flange is welded and installed on the side of the drive shaft, and the second flange is welded and installed at the end of the docking sleeve.

[0009] Further, a sealing protrusion is provided at the end of the drive shaft, a flat key is provided on the surface of the drive shaft, a keyway is provided on the inner wall of the docking sleeve, the drive shaft is embedded into the keyway through the flat key, and the side of the sealing protrusion is in contact with the inner wall of the docking sleeve.

[0010] Further, the first flange and the second flange are connected and fixed by a long screw. A positioning screw is inserted through the side of the first flange, a top plate is provided at the end of the positioning screw, and the positioning screw presses the top plate against the surface of the first flange in a rotating manner.

[0011] Further, the outside of the lead-out hole is aligned with the inside of the housing of the first detection module. A diversion pipeline is connected to the bottom of the first detection module, and the end of the diversion pipeline communicates with the inside of the quantitative cavity.

[0012] Further, a discharge port is connected to the side of the quantitative cavity, a valve structure is installed on the surface of the discharge port, and the housing part of the first detection module and the support sleeve part are welded into a whole.

[0013] Further, a groove is provided on the inner wall of the pump casing, the inside of the groove communicates with the inside of the second detection module, and a vibration sensor is embedded on the inner wall of the groove.

[0014] Further, an infrared temperature measurement probe is installed at the rear end inside the groove, and signal lines are connected to the rear ends of both the vibration sensor and the infrared temperature measurement probe. A wire conduit is provided on the side of the controller, and each signal line passes through the inside of the wire conduit.

[0015] Advantages of the present invention: A centrifugal pump fault detector of the present invention includes a detector body, and the detector body includes a controller, a motor, a drive shaft, a water inlet pipe, a pump casing, a water outlet pipe, a support sleeve, a first detection module, a docking mechanism, a second detection module, a diversion pipe, a quantitative cavity, a discharge port, a wire pipe, a pump shaft, a docking sleeve, a collection hole, a centrifugal impeller, a lead-out hole, a keyway, a flat key, a sealing convex block, a first flange, a second flange, a long screw, a positioning screw, a top plate, a groove, an infrared temperature probe, a vibration sensor, and a signal wire.

[0016] The centrifugal pump fault detector is provided with a collection hole at the front end of the pump shaft. During regular fault detection, the liquid squeezed between two adjacent centrifugal impellers can be led out and collected through this collection hole inside the pump shaft, and the sealing state between the centrifugal impeller at the bottom of this group and the pump casing can be judged according to the amount of the solution collected each time, so as to realize the detection process of the internal sealing condition of the centrifugal pump.

[0017] The centrifugal pump fault detector connects the drive shaft and the docking sleeve part through the docking mechanism at the rear end, so as to realize the transmission function, and by controlling the fitting state between the two flanges in the docking mechanism, the lead-out hole can be closed through the end of the drive shaft, ensuring that all the liquid can be pumped out and transported during operation, and improving the connection stability and the sealing performance inside the detection pipeline.

[0018] The centrifugal pump fault detector is provided with a groove on the inner wall of the pump casing, and both the vibration sensor and the infrared temperature probe are installed inside the groove, so that the vibration condition of the centrifugal impeller can be measured at a close distance during the operation state, and the specific operating temperature of each centrifugal impeller can be measured during the slow-speed state, further improving the measurement accuracy and the positioning accuracy of the fault location. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the outer shape of a centrifugal pump fault detector of the present invention;

[0020] Figure 2 It is a schematic structural diagram of the centrifugal blade part of a centrifugal pump fault detector of the present invention;

[0021] Figure 3 It is a cross-sectional view inside the support sleeve of a centrifugal pump fault detector of the present invention;

[0022] Figure 4 It is a schematic structural diagram of the docking mechanism part of a centrifugal pump fault detector of the present invention;

[0023] Figure 5 It is a schematic structural diagram of the second detection module part of a centrifugal pump fault detector of the present invention;

[0024] In the figure: 1. Controller; 2. Motor; 3. Drive shaft; 4. Water inlet pipe; 5. Pump casing; 6. Water outlet pipe; 7. Support sleeve; 8. First detection module; 9. Docking mechanism; 10. Second detection module; 11. Diversion pipe; 12. Quantitative cavity; 13. Discharge port; 14. Wire pipe; 15. Pump shaft; 16. Docking sleeve; 17. Collection hole; 18. Centrifugal impeller; 19. Outlet hole; 20. Keyway; 21. Flat key; 22. Sealing bump; 23. First flange; 24. Second flange; 25. Long screw; 26. Positioning screw; 27. Top plate; 28. Groove; 29. Infrared temperature probe; 30. Vibration sensor; 31. Signal wire. Embodiment

[0025] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0026] Please refer to Figures 1 to 5 , the present invention provides a technical solution: a centrifugal pump fault detector, including a detector body, a centrifugal impeller 18 and a motor 2. The detector body includes a controller 1, a docking mechanism 9, a first detection module 8 and a second detection module 10. A quantitative cavity 12 is installed on the top of the controller 1. The top of the quantitative cavity 12 is partially connected to the first detection module 8. A support sleeve 7 is arranged on the side of the first detection module 8. The support sleeve 7 is installed on one side of the pump casing 5. The other side of the pump casing 5 is connected to a water inlet pipe 4. The top of the pump casing 5 is provided with a water outlet pipe 6. The centrifugal impeller 18 is installed inside the pump casing 5. A second detection module 10 is arranged on the side of the pump casing 5. A docking mechanism 9 is arranged on the side of the first detection module 8. The middle of the docking mechanism 9 is connected to the drive shaft 3. One end of the drive shaft 3 is connected to the output end of the motor 2. The second detection module 10 is connected to the inside of the controller 1 through a signal wire 31. When installing this centrifugal pump fault detector, the drive shaft 3 is fixedly connected to the end of the docking sleeve 16 by using the docking mechanism 9. After the motor 2 runs, the docking sleeve and the centrifugal impeller 18 part at the end can be driven by using the docking mechanism 9. An infrared temperature probe 29 and a vibration sensor 30 are installed in the groove 28 area inside the pump casing 5. Inside the pump casing 5, the vibration state and temperature of the centrifugal impeller 18 part can be directly detected. When detecting, it is necessary to first control the motor 2 to rotate slowly. The first detection module 8 collects the solution squeezed between two adjacent centrifugal impellers 18. The collected volume is compared with the preset standard volume to judge the sealing state of this group of centrifugal impellers 18, and during operation, the vibration situation inside the pump casing 5 is parameter-collected by the infrared temperature probe 29 and the vibration sensor 30.

[0027] In this embodiment, a pump shaft 15 is inserted through the central position of the pump housing 5. The rear end of the centrifugal impeller 18 is integrally fixed to the side of the end of the pump shaft 15. A docking sleeve 16 is installed at the end of the pump shaft 15. A keyway 20 is provided inside the docking sleeve 16. A collection hole 17 is provided at the end of the pump shaft 15. A lead-out hole 19 is provided on the surface of the docking sleeve 16. The inside of the pump shaft 15 is of a hollow structure, and the collection hole 17 is communicated with the inside of the lead-out hole 19 through the inside of the pump shaft 15. Specifically, after the control motor 2 rotates slowly, the centrifugal impeller 18 pushes the solution from the front water inlet pipe 4. As the centrifugal impeller 18 rotates, the solution can be transported upward. During this rotation process, part of the solution can flow into the inside of the pump shaft 15 along the collection hole 17 on the pump shaft 15 aligned with the end of the centrifugal impeller 18 and continue to flow backward until it flows into the inside of the first detection mechanism for subsequent volume measurement. If the volume collected each time is lower than the standard value, it indicates that the sealing performance between the two centrifugal impellers 18 has decreased, and part of the solution is lost from the edge during the rotation of the centrifugal impeller 18, thus completing the sealing detection process for each centrifugal impeller 18.

[0028] In this embodiment, the docking mechanism 9 includes a first flange 23 and a second flange 24. The first flange 23 is welded and installed on the side of the drive shaft 3, and the second flange 24 is welded and installed at the end of the docking sleeve 16. A sealing convex block 22 is provided at the end of the drive shaft 3, and a flat key 21 is provided on the surface of the drive shaft 3. A key groove 20 is formed on the inner wall of the docking sleeve 16. The drive shaft 3 is inserted into the key groove 20 through the flat key 21. The side of the sealing convex block 22 is in contact with the inner wall of the docking sleeve 16. The first flange 23 and the second flange 24 are connected and fixed by a long screw 25. A positioning screw 26 is inserted through the side of the first flange 23, and a top plate 27 is provided at the end of the positioning screw 26. The positioning screw 26 presses the top plate 27 against the surface of the first flange 23 in a rotational manner. By connecting the drive shaft 3 and the docking sleeve 16 through the docking mechanism 9 at the rear end, the transmission function can be achieved, and by controlling the fitting state between the two flanges in the docking mechanism 9, the outlet hole 19 can be closed through the end of the drive shaft 3, ensuring that all the liquid can be pumped out during operation, improving the connection stability and the sealing performance inside the detection pipeline. Specifically, during the detection, by controlling the rotation of the long screw 25 to separate the first flange 23 and the second flange 24, and then rotating the positioning screw 26 to press the top plate 27 at the end against the second flange 24, the drive shaft 3 can be moved backward to prevent the sealing convex block 22 from blocking the outlet hole 19. In this state, the solution collected inside the pump shaft 15 can flow into the first detection module 8 through the outlet hole 19 for subsequent detection. When in normal use, the positioning screw 26 is removed, the first flange 23 and the second flange 24 are fitted together, and the outlet hole 19 is closed by the sealing convex block 22.

[0029] In this embodiment, the outside of the outlet hole 19 is aligned with the inside of the housing of the first detection module 8. A diversion pipeline 11 is connected to the bottom of the first detection module 8. The end of the diversion pipeline 11 communicates with the inside of the metering chamber 12. A discharge port 13 is connected to the side of the metering chamber 12. A valve structure is installed on the surface of the discharge port 13. The housing part of the first detection module 8 and the support sleeve 7 part are welded into a whole. A collection hole 17 is provided at the front end of the pump shaft 15. During regular fault detection, the liquid squeezed between two adjacent centrifugal impellers 18 can be led out and collected from the inside of the pump shaft 15 through the collection hole 17, and the sealing state between the centrifugal impeller 18 at the bottom of this group and the pump casing 5 can be judged according to the amount of the solution collected each time, so as to realize the detection process of the internal sealing condition of the centrifugal pump. Specifically, after the single-time collected solution enters the inside of the first detection module 8 through the outlet hole 19, it will enter the metering chamber 12 through the diversion pipeline 11. After measuring the volume at this position, it can be discharged along the discharge port 13 at the bottom for the next-stage collection.

[0030] In this embodiment, a groove 28 is provided on the inner wall of the pump casing 5. The inside of the groove 28 communicates with the inside of the second detection module 10. A vibration sensor 30 is embedded on the inner wall of the groove 28. An infrared temperature measurement probe 29 is installed at the rear end inside the groove 28. Signal lines 31 are connected to the rear ends of both the vibration sensor 30 and the infrared temperature measurement probe 29. A wire pipe 14 is provided on the side of the controller 1. Each signal line 31 passes through the inside of the wire pipe 14. A groove 28 is provided on the inner wall of the pump casing 5, and both the vibration sensor 30 and the infrared temperature measurement probe 29 are installed inside the groove 28, so that the vibration condition of the centrifugal impeller 18 can be measured closely during the running state, and the specific running temperature of each centrifugal impeller 18 can be measured during the slow-speed state, further improving the measurement accuracy and the positioning accuracy of the fault location. Specifically, during measurement, when the centrifugal impeller 18 pushes the solution to flow during the running state, the vibration state of the centrifugal pump can be detected through the embedded vibration sensor 30, and during the slow-speed state, the running temperature of each centrifugal impeller 18 can be detected by the infrared temperature measurement probe 29 to realize the accurate positioning function of the high-friction area.

[0031] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0032] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. A person skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A centrifugal pump fault detector, comprising a detector body, a centrifugal impeller (18) and a motor (2), characterized in that: The detector body includes a controller (1), a docking mechanism (9), a first detection module (8) and a second detection module (10). A quantitative cavity (12) is installed on the top of the controller (1). The top of the quantitative cavity (12) is partially connected to the first detection module (8). A support sleeve (7) is arranged on the side of the first detection module (8). The support sleeve (7) is installed on one side of the pump casing (5). The other side of the pump casing (5) is connected to a water inlet pipe (4). The top of the pump casing (5) is provided with a water outlet pipe (6). The centrifugal impeller (18) is installed inside the pump casing (5). A second detection module (10) is arranged on the side of the pump casing (5). A docking mechanism (9) is arranged on the side of the first detection module (8). The middle of the docking mechanism (9) is connected to the drive shaft (3). One end of the drive shaft (3) is connected to the output end of the motor (2). The second detection module (10) is connected to the inside of the controller (1) through a signal line (31). A pump shaft (15) penetrates through the center of the pump casing (5). The rear end of the centrifugal impeller (18) is integrally fixed to the end side of the pump shaft (15). A docking sleeve (16) is installed at the end of the pump shaft (15). A keyway (20) is provided inside the docking sleeve (16). A collection hole (17) is provided at the end of the pump shaft (15). A lead-out hole (19) is provided on the surface of the docking sleeve (16). The inside of the pump shaft (15) is of a hollow structure, and the collection hole (17) communicates with the inside of the lead-out hole (19) through the inside of the pump shaft (15). The outside of the lead-out hole (19) is aligned with the inside of the housing of the first detection module (8). A diversion pipe (11) is connected to the bottom of the first detection module (8). The end of the diversion pipe (11) communicates with the inside of the quantitative cavity (12). A groove (28) is provided on the inner wall of the pump casing (5). The inside of the groove (28) communicates with the inside of the second detection module (10). A vibration sensor (30) is embedded on the inner wall of the groove (28). An infrared temperature measurement probe (29) is installed at the rear end inside the groove (28). Signal lines (31) are connected to the rear ends of both the vibration sensor (30) and the infrared temperature measurement probe (29). A wire pipe (14) is arranged on the side of the controller (1). Each signal line (31) passes through the inside of the wire pipe (14).

2. A centrifugal pump fault detector according to claim 1, characterized in that: The docking mechanism (9) includes a first flange (23) and a second flange (24). The first flange (23) is welded to the side of the drive shaft (3). The second flange (24) is welded to the end of the docking sleeve (16).

3. A centrifugal pump fault detector according to claim 2, characterized in that: A sealing bump (22) is provided at the end of the drive shaft (3), a flat key (21) is provided on the surface of the drive shaft (3), a keyway (20) is formed on the inner wall of the docking sleeve (16), the drive shaft (3) is inserted into the interior of the keyway (20) through the flat key (21), and the side of the sealing bump (22) is in contact with the inner wall of the docking sleeve (16).

4. A centrifugal pump fault detector according to claim 3, characterized in that: The first flange (23) and the second flange (24) are fixedly connected by a long screw (25). A positioning screw (26) is inserted through the side of the first flange (23). A top plate (27) is provided at the end of the positioning screw (26). The positioning screw (26) abuts the top plate (27) against the surface of the first flange (23) in a rotational manner.

5. A centrifugal pump fault detector according to claim 1, characterized in that: A discharge port (13) is connected to the side of the quantitative cavity (12). A valve structure is installed on the surface of the discharge port (13). The housing part of the first detection module (8) and the support sleeve (7) part are welded into an integral body.

Images