Centrifugal pump speed measuring device and centrifugal pump

Abstract

This utility model discloses a speed measuring device for a centrifugal pump and the centrifugal pump itself. The centrifugal pump has a pump shaft, and the speed measuring device includes a bearing cover, a clamping ring, and a speed measuring probe. The clamping ring is fixed to the pump shaft and can rotate synchronously with the pump shaft. Multiple speed measuring adapters are spaced apart along the circumferential direction on the clamping ring. The bearing cover includes a cover body that is integrally shaped as a rotating body. A receiving cavity for accommodating the clamping ring is formed inside the cover body. A first mounting hole and a second mounting hole communicating with the receiving cavity are provided on the side wall of the cover body. The first and second mounting holes are asymmetrically spaced along the circumferential direction. The speed measuring probe is installed in the first and second mounting holes and has a monitoring end facing the speed measuring adapter of the clamping ring. This application achieves precise installation of the speed measuring probe through structural innovation of the bearing cover and clamping ring, improving the stability and measurement accuracy of the speed measurement signal, while also adapting to the existing structure of the centrifugal pump and improving installation convenience.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump speed detection technology, and in particular to a centrifugal pump speed measuring device and a centrifugal pump. Background Technology

[0002] In some industrial production applications, the speed of a centrifugal pump is a core indicator for ensuring the safe and stable operation of the equipment. Real-time monitoring of the pump's actual speed can effectively prevent mechanical damage caused by overspeed operation, and at the same time provide accurate real-time data support for equipment fault diagnosis and operating condition adjustment. It is a key link in the centrifugal pump operation monitoring system.

[0003] In existing technologies, the speed detection of centrifugal pumps generally adopts the method of mounting the speed measuring instrument probe on the coupling cover, with the coupling as the measured part, and the speed measuring instrument probe is usually installed at the customer's site.

[0004] However, since the coupling cover is a sheet metal component, its rigidity is insufficient and the machining accuracy of the parts is low. Therefore, it is impossible to guarantee the accurate installation and positioning of the speed measuring instrument probe, which leads to unstable signal transmission and poor measurement accuracy during the speed measurement process, making it difficult to meet the requirements of high-precision speed monitoring of centrifugal pumps.

[0005] Therefore, it is necessary to propose a centrifugal pump speed measuring device and a centrifugal pump to solve at least one of the above problems.

[0006] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a speed measuring device and a centrifugal pump. Through innovative structural design of the bearing cap and clamping ring, the speed measuring probe is precisely installed, improving the stability and accuracy of the speed measurement signal. At the same time, it is compatible with the original structure of the centrifugal pump, improving installation convenience.

[0008] The specific technical solution of this utility model embodiment is as follows:

[0009] A speed measuring device for a centrifugal pump, the centrifugal pump having a pump shaft, the speed measuring device comprising: a bearing cover, a clamping ring, and a speed measuring probe, the clamping ring being fixedly connected to the pump shaft and capable of rotating synchronously with the pump shaft, the clamping ring having a plurality of speed measuring adapters spaced apart along the circumferential direction; the bearing cover comprising a cover body integrally shaped as a rotating body, the cover body having a receiving cavity for accommodating the clamping ring, the side wall of the cover body having a first mounting hole and a second mounting hole communicating with the receiving cavity, the first mounting hole and the second mounting hole being asymmetrically spaced along the circumferential direction; the speed measuring probe being installed in the first mounting hole and the second mounting hole, the speed measuring probe having a monitoring end facing the speed measuring adapter of the clamping ring.

[0010] In a preferred embodiment, the cover has a first end near the pump shaft and a second end away from the pump shaft, the second end being provided with at least one observation hole, the observation hole being a through hole penetrating the second end.

[0011] In a preferred embodiment, the observation hole is connected to the first mounting hole and the second mounting hole.

[0012] In a preferred embodiment, the extension line of the first mounting hole and / or the second mounting hole intersects the extension line of the observation hole.

[0013] In a preferred embodiment, the number of observation holes is adapted to the sum of the number of the first mounting holes and the number of the second mounting holes, and one observation hole is provided for each of the first mounting holes and the second mounting holes.

[0014] In a preferred embodiment, the clamping ring includes an annular body, the outer contour of which is stepped with a variable cross-section along the axial direction, including a first ring segment and a second ring segment, the extension lines of the first mounting hole and the second mounting hole intersect with the second ring segment, and a plurality of speed measuring adapters are disposed on the second ring segment.

[0015] In a preferred embodiment, the speed measuring adapter is a groove disposed on the second ring segment, and the extension lines of the first mounting hole and the second mounting hole can intersect the groove.

[0016] In a preferred embodiment, there are multiple grooves, and the multiple grooves are evenly spaced along the circumferential direction of the clamping ring.

[0017] In a preferred embodiment, the number of grooves is 3N, where N is a positive integer ≥ 1. In a preferred embodiment, the clamping ring is a conductive metal structure, the speed measuring adapter is a groove disposed on the second ring segment, the grooves are spaced apart along the circumferential direction of the second ring segment, forming a non-groove area between two adjacent grooves, and the distance from the monitoring end of the speed measuring probe to the groove is greater than the distance from the monitoring end of the speed measuring probe to the non-groove area.

[0018] A centrifugal pump, comprising a speed measuring device for any of the centrifugal pumps described above.

[0019] The technical solution of this utility model has the following significant beneficial effects:

[0020] In this embodiment, the speed measuring device for the centrifugal pump features an innovative structural design for the bearing cap and clamping ring. The clamping ring is fixedly connected to the pump shaft and rotates synchronously with it, ensuring that the speed measuring adapter rotates exactly the same speed as the pump shaft. This eliminates speed transmission deviation from the transmission structure, laying the foundation for accurate speed measurement. The bearing cap is designed as a rotating body with a receiving cavity, forming an integrated assembly structure with the clamping ring. This adapts to the original structure of the centrifugal pump, eliminating the need for significant modifications to the pump body and greatly improving the ease of on-site installation and reducing assembly difficulty. Asymmetrically distributed... The first and second mounting holes, along with the matching speed probe, enable the speed probe to capture electrical signals with phase differences. This not only allows for speed detection but also enables the determination of centrifugal pump rotation direction through phase difference changes, achieving reverse rotation monitoring. This overcomes the limitations of traditional speed measuring devices that can only measure speed, effectively preventing equipment malfunctions such as a sudden drop in conveying efficiency and abnormal mechanical stress caused by centrifugal pump reversal. The monitoring end of the speed probe faces the speed measuring adapter of the clamping ring, ensuring that the probe can accurately capture the physical changes brought about by the speed measuring adapter, guaranteeing the effectiveness of electrical signal induction and improving the stability of the speed measuring signal.

[0021] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0022] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0023] Figure 1 This is an assembly diagram of a speed measuring device for a centrifugal pump provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the bearing cover in a speed measuring device for a centrifugal pump provided in the embodiments of this application;

[0025] Figure 3 for Figure 2 Sectional view at point AA;

[0026] Figure 4 This is a schematic diagram of the clamping ring in a speed measuring device for a centrifugal pump provided in an embodiment of this application;

[0027] Figure 5 for Figure 4 Sectional view at point BB;

[0028] Figure 6 This is an assembly diagram of a speed measuring device for a centrifugal pump provided in an embodiment of this application;

[0029] Figure 7 for Figure 6 A schematic diagram of the compression ring in the C-direction.

[0030] The reference numerals in the above figures are as follows:

[0031] 1. Bearing gland;

[0032] 10. Receiving cavity;

[0033] 101. First end;

[0034] 102. Second end;

[0035] 11. First mounting hole;

[0036] 12. Second mounting hole;

[0037] 13. Observation hole;

[0038] 2. Pressure ring;

[0039] 21. First segment;

[0040] 22. Second ring segment;

[0041] 221. Groove;

[0042] 222. Non-groove area;

[0043] 3. Speed ​​measuring probe;

[0044] 30. Monitoring terminal;

[0045] 4. Pump shaft;

[0046] 5. Fasteners;

[0047] 6. Thrust plate. Detailed Implementation

[0048] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are only for explaining the purpose of this utility model and should not be construed as limiting this utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, which can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] Currently, commonly used speed measuring instrument probes mainly include two types: eddy current type and magnetoresistive type. Both rely on the precise relative position between the probe and the measured component to achieve stable electrical signal sensing and conversion. However, the existing installation method of coupling guards not only leads to large deviations in the relative distance between the probe and the measured coupling due to installation accuracy issues, but also further exacerbates signal fluctuations due to structural wobbling of the coupling guard. This results in large errors in the speed measurement results, failing to provide reliable data support for the safe operation of centrifugal pumps.

[0051] In addition, some shaft speed measurement solutions exist in related technologies, such as setting a speed measuring disk with a concave structure at the end of the shaft and using a speed measuring probe to detect the rotational speed. Although this optimizes the speed measurement stability to a certain extent, the speed measuring disk of this type of solution is set independently at the end of the shaft, which has poor compatibility with the main structure of the centrifugal pump such as the pump shaft and bearings. It does not take into account the structural characteristics of the centrifugal pump for integrated design. During installation, the centrifugal pump needs to be significantly modified, resulting in low installation convenience. Moreover, its probe installation and positioning structure design is simple, but it is still difficult to meet the dual requirements of installation accuracy and monitoring precision.

[0052] In summary, existing centrifugal pump speed measurement solutions suffer from insufficient installation accuracy, unstable speed signals, and low measurement precision. Furthermore, some general-purpose shaft speed measurement solutions have poor compatibility with centrifugal pump structures and low installation convenience, failing to meet the high-precision and convenient speed monitoring requirements of centrifugal pump industrial applications. There is an urgent need for a speed measurement device that is adapted to the structural characteristics of centrifugal pumps, has high installation accuracy, and provides accurate and stable speed measurement.

[0053] This utility model provides a speed measuring device for a centrifugal pump and a centrifugal pump. Through innovative structural design of the bearing cover and clamping ring, the speed measuring probe can be accurately installed, improving the stability and measurement accuracy of the speed measuring signal. At the same time, it is compatible with the original structure of the centrifugal pump, improving the ease of installation.

[0054] Please refer to the following for comprehensive information. Figures 1 to 7This application specification provides a speed measuring device for a centrifugal pump, which may include: a speed measuring device for a centrifugal pump, the centrifugal pump having a pump shaft 4, the speed measuring device for the centrifugal pump including: a bearing cover 1, a clamping ring 2, and a speed measuring probe 3, the clamping ring 2 being fixedly connected to the pump shaft 4 and capable of rotating synchronously with the pump shaft 4, the clamping ring 2 having a plurality of speed measuring adapters spaced apart along the circumferential direction; the bearing cover 1 including a cover body that is integrally shaped as a rotating body, the cover body having a receiving cavity 10 for accommodating the clamping ring 2, the side wall of the cover body having a first mounting hole 11 and a second mounting hole 12 communicating with the receiving cavity 10, the first mounting hole 11 and the second mounting hole 12 being asymmetrically spaced along the circumferential direction; the speed measuring probe 3 being installed in the first mounting hole 11 and the second mounting hole 12, the speed measuring probe 3 having a monitoring end 30 facing the speed measuring adapter of the clamping ring 2.

[0055] In this embodiment, the speed measuring device for the centrifugal pump features an innovative structural design for the bearing cover 1 and the clamping ring 2. The clamping ring 2 is fixedly connected to the pump shaft 4 and rotates synchronously with the shaft, ensuring that the speed measuring adapter rotates exactly the same speed as the pump shaft 4. This eliminates speed transmission deviation from the transmission structure, laying the foundation for accurate speed measurement. The bearing cover 1 is designed as a rotating body with a receiving cavity 10, forming an integrated assembly structure with the clamping ring 2. This adapts to the original structure of the centrifugal pump, eliminating the need for significant modifications to the pump body and greatly improving the ease of on-site installation and reducing assembly difficulty. Asymmetrically distributed first... The device includes a mounting hole 11, a second mounting hole 12, and a matching speed probe 3. The speed probe 3 can capture electrical signals with phase differences, enabling not only speed detection but also the determination of centrifugal pump rotation direction through phase difference changes. This achieves reverse rotation monitoring, overcoming the limitations of traditional speed measuring devices that can only measure speed. It effectively prevents equipment failures such as a sudden drop in conveying efficiency and abnormal mechanical stress caused by centrifugal pump reversal. The monitoring end 30 of the speed probe 3 faces the speed measuring adapter of the clamping ring 2, ensuring that the probe can accurately capture the physical changes brought about by the speed measuring adapter, guaranteeing the effectiveness of electrical signal induction, and improving the stability of the speed measuring signal.

[0056] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0057] The speed measuring device of the centrifugal pump may include: a bearing cover 1, a clamping ring 2, and two speed measuring probes 3.

[0058] Please refer to the following: Figure 1 , Figure 4 and Figure 5 or Figure 6 and Figure 7The clamping ring 2 can be indirectly connected to the pump shaft 4, thus rotating synchronously with the pump shaft 4. Specifically, the clamping ring 2 can be fixedly connected to the thrust plate 6 via fasteners 5. A split retaining ring can be provided between the thrust plate 6 and the clamping ring 2, which is used to axially position the thrust plate 6 on the pump shaft 4. The clamping ring 2 is a metal conductive structure, and its annular body has a stepped shape with a variable cross-section along the axial direction, including a first ring segment 21 and a second ring segment 22. Multiple speed measuring adapters are evenly spaced along the circumferential direction on the second ring segment 22. The speed measuring adapter can be a groove 221, but it can also be in other forms, such as a protrusion. In this embodiment, the groove 221 is mainly used as an example.

[0059] Among them, such as Figure 1 , Figure 3 and Figure 5 As shown, the outer diameter of the second ring segment 22 of the clamping ring 2 can be smaller than the outer diameter of the first ring segment 21. Alternatively, as... Figure 6 and Figure 7 As shown, the outer diameter of the second ring segment 22 can be larger than the outer diameter of the first ring segment 21. The specific structure of the clamping ring 2 can be adapted to different fit spaces formed between the pump shaft 4 end of the centrifugal pump and the bearing cap 1, and this application does not impose a single limitation on it.

[0060] The first ring segment 21 of the clamping ring 2 may be provided with an axial through hole, and at least a portion of the inner surface of the through hole may be provided with an internal thread, which can be used to mate with the external thread of the fastener 5.

[0061] Please refer to the following: Figure 1 , Figure 2 and Figure 3 The bearing cap 1 may include a cap body that is integrally shaped as a rotating body, and a receiving cavity 10 is formed inside the cap body for accommodating and installing the clamping ring 2. A first mounting hole 11 and a second mounting hole 12 communicating with the receiving cavity 10 are provided on the side wall of the cap body. The first mounting hole 11 and the second mounting hole 12 are asymmetrically spaced along the circumferential direction, and the included angle between the central axes of the two holes is not 180°.

[0062] The two speed measuring probes 3 are respectively installed in the first mounting hole 11 and the second mounting hole 12. Specifically, the speed measuring probe 3 can be an eddy current probe, which has a monitoring end 30 facing the groove 221 on the clamping ring 2, and the speed measuring probe 3 is electrically connected to an external speed measuring instrument.

[0063] Furthermore, the cover has a first end 101 near the pump shaft 4 and a second end 102 away from the pump shaft 4. The second end 102 is provided with two observation holes 13. The observation holes 13 are through holes that pass through the second end 102. The two observation holes 13 are provided in a one-to-one correspondence with the first mounting hole 11 and the second mounting hole 12, and the observation holes 13 are connected to the corresponding mounting holes. The extension lines of the first mounting hole 11 and the second mounting hole 12 intersect with the extension lines of the corresponding observation holes 13.

[0064] The centrifugal pump speed measuring device provided in this application embodiment can detect the centrifugal pump speed based on the eddy current effect, and achieve reverse monitoring through the asymmetrical arrangement of two speed measuring probes 3. The specific working process is as follows:

[0065] The clamping ring 2 can be indirectly connected to the pump shaft 4. Specifically, a split retaining ring can be used to axially position the thrust plate 6 on the pump shaft 4. The clamping ring 2 is then fixedly connected to the thrust plate 6 using fasteners 5. The bearing cover 1 is fixedly assembled with the centrifugal pump bearing seat, so that the clamping ring 2 is housed in the receiving cavity 10 of the bearing cover 1. The two speed probes 3 are respectively installed into the first mounting hole 11 and the second mounting hole 12. The installer can visually observe the installation status of the speed probe 3 through the observation hole 13, ensuring that the monitoring end 30 of the speed probe 3 is precisely aligned with the groove 221 on the second ring segment 22 of the clamping ring 2, achieving precise alignment between the probe and the speed measuring adapter. The connection design between the observation hole 13 and the mounting hole ensures the intuitiveness and accuracy of the alignment.

[0066] The speed probe 3 has a built-in induction coil that carries alternating current. When the coil is energized, it generates an alternating magnetic field. Since the clamping ring 2 is a metal conductive structure, the alternating magnetic field will induce closed eddy currents on the second ring segment 22 of the clamping ring 2. The reverse magnetic field generated by the eddy currents will interact with the original magnetic field of the probe coil, causing changes in the coil's impedance, inductance and other electrical parameters.

[0067] When the pump shaft 4 rotates, it drives the clamping ring 2 to rotate synchronously. The groove 221 and the non-groove area 222 on the second ring section 22 of the clamping ring 2 will periodically alternately pass through the monitoring end 30 of the speed probe 3. Since the distance from the monitoring end 30 to the groove 221 is greater than the distance to the non-groove area 222, the eddy current effect is weakened when the groove 221 passes through, and the change amplitude of the electrical parameters is small. When the non-groove area 222 passes through, the eddy current effect is enhanced, and the change amplitude of the electrical parameters is large. This causes the electrical parameters of the speed probe 3 to change periodically. The external speed measuring instrument detects this periodic change signal in real time, extracts the signal frequency, and combines it with the number of grooves 221 on the clamping ring 2. The real-time speed of the centrifugal pump is calculated by the formula: speed (rpm) = (signal frequency × 60) ÷ number of grooves 221.

[0068] Since the first mounting hole 11 and the second mounting hole 12 are asymmetrically distributed, their included angle is precisely matched with the number of grooves 221. The monitoring ends 30 of the two speed probes 3 will capture the distance changes between the grooves 221 and the non-grooves area 222 at different times, and then output an electrical signal with a fixed phase difference. When the centrifugal pump rotates forward, the phase difference of the electrical signals of the two probes is a fixed value. When the centrifugal pump rotates in reverse, the phase difference of the electrical signals will change in the opposite direction. The external speed measuring instrument can accurately determine the direction of rotation of the centrifugal pump by identifying the change of the phase difference, realize the reverse rotation monitoring function, and effectively prevent equipment failure caused by the reverse rotation of the centrifugal pump.

[0069] In one embodiment, the cover has a first end 101 near the pump shaft 4 and a second end 102 away from the pump shaft 4. The second end 102 is provided with at least one observation hole 13, which is a through hole penetrating the second end 102.

[0070] In this embodiment, a through-hole 13 is provided at the second end 102 of the bearing cap 1 away from the pump shaft 4, providing an intuitive alignment reference for the installation of the speed probe 3. This solves the problem that the traditional speed probe 3 installation has no observation angle and can only be aligned by experience. It allows the installer to directly observe the relative position of the probe monitoring end 30 and the speed measuring adapter of the clamping ring 2, improving the accuracy of the probe installation. The observation hole 13 is located at the second end 102 (away from the pump shaft 4), avoiding interference structures such as the pump shaft 4 and the centrifugal pump bearing seat, reserving sufficient operating space for the installation operation, and further improving the convenience of installation.

[0071] In one embodiment, the observation hole 13 is connected to the first mounting hole 11 and the second mounting hole 12.

[0072] In this embodiment, since the observation hole 13 is connected to the first mounting hole 11 and the second mounting hole 12, the observation angle can directly cover the alignment area between the probe monitoring end 30 and the speed measuring adapter, eliminating the problem of obstruction of the observation angle, ensuring that the installer can clearly and accurately judge the alignment status of the speed measuring probe 3, avoiding installation misalignment caused by the deviation of the viewing angle, further improving the installation accuracy of the speed measuring probe 3, and ensuring the stability and speed measurement accuracy of the subsequent speed measurement signal from the installation stage.

[0073] Furthermore, the extension lines of the first mounting hole 11 and / or the second mounting hole 12 intersect the extension line of the observation hole 13. When the extension lines of the first mounting hole 11 and the second mounting hole 12 intersect the extension line of the observation hole 13, the position of the observation hole 13 and the mounting hole are precisely matched, allowing the installer's line of sight to reach the mating position of the probe monitoring end 30 and the speed measuring adapter along the observation hole 13, achieving precise alignment and installation of the probe and completely solving the problem of misalignment during installation. At the same time, this position design makes the opening of the observation hole 13 more in line with the installation requirements, avoiding ineffective openings, ensuring the structural rigidity of the bearing cover 1, and preventing the cover strength from decreasing due to excessive openings.

[0074] In one embodiment, the number of observation holes 13 is adapted to the sum of the number of the first mounting holes 11 and the second mounting holes 12, and one observation hole 13 is provided for each of the first mounting holes 11 and the second mounting holes 12.

[0075] In this embodiment, by setting the observation holes 13 in a one-to-one correspondence with the first mounting holes 11 and the second mounting holes 12, independent observation and alignment of each speed probe 3 during installation is achieved. This effectively avoids mutual interference during the installation of the speed probes 3, ensuring that both speed probes 3 can be accurately aligned with the speed measuring adapter, guaranteeing the effectiveness of the output signal of the speed probes 3, and providing a reliable signal foundation for speed detection and reverse rotation monitoring. Furthermore, the number of observation holes 13 matches the number of mounting holes, avoiding unnecessary openings, maximizing the structural rigidity of the bearing cover 1, while reducing processing steps and controlling manufacturing costs.

[0076] In one embodiment, the clamping ring 2 may include an annular body, the outer contour of which is stepped with a variable cross-section along the axial direction, including a first ring segment 21 and a second ring segment 22. The outer diameter of the second ring segment 22 is smaller than the outer diameter of the first ring segment 21. The extension lines of the first mounting hole 11 and the second mounting hole 12 intersect with the second ring segment 22. A plurality of speed measuring adapters are disposed on the second ring segment 22.

[0077] In this embodiment, the clamping ring 2 is configured as a stepped structure with an axially variable cross-section, divided into a first ring segment 21 and a second ring segment 22. By differentiating the outer diameter, the second ring segment 22 forms a dedicated speed measurement area, avoiding interference from the first ring segment 21 and other structures of the pump shaft 4 on the speed measurement signal. This ensures that the speed probe 3 only senses the physical changes in the second ring segment 22, improving the purity and stability of the electrical signal. Furthermore, the extension lines of the first mounting hole 11 and the second mounting hole 12 intersect with the second ring segment 22, ensuring that the monitoring end 30 of the speed probe 3 is accurately aligned with the detection area, preventing invalid sensing of non-detection areas by the speed probe 3, and further improving speed measurement accuracy.

[0078] In one specific embodiment, the speed measuring adapter is a groove 221 provided on the second ring segment 22, and the extension lines of the first mounting hole 11 and the second mounting hole 12 can intersect with the groove 221.

[0079] In this embodiment, when the speed measuring adapter is in the form of a groove 221, a significant distance difference is formed between the groove 221 and the non-groove area 222, providing the speed measuring probe 3 with a clear and identifiable physical change signal. This ensures that the probe can stably sense the changes in electrical parameters caused by the distance change, improving the regularity and identifiability of the speed measuring signal. The extension lines of the first mounting hole 11 and the second mounting hole 12 intersect with the groove 221, which helps ensure that the monitoring end 30 of the speed measuring probe 3 can accurately capture the alternating changes between the groove 221 and the non-groove area 222, avoiding problems such as insensitive signal sensing and large speed measurement errors caused by alignment deviations, thus ensuring the accuracy of speed detection.

[0080] In one embodiment, there are multiple grooves 221, and the multiple grooves 221 are evenly spaced along the circumferential direction of the clamping ring 2.

[0081] In this embodiment, the number of grooves 221 can be adapted to the different speed detection accuracy requirements of centrifugal pumps. The number of grooves 221 is at least one. Generally, the more grooves 221 there are, the more signal changes the speed probe 3 senses per unit time, resulting in higher speed measurement accuracy.

[0082] Specifically, the number of grooves is 3N, where N is a positive integer ≥ 1. For example, the number of grooves 221 includes any of the following: 3, 6, or 9. The number of grooves 221 can be adapted to the speed detection accuracy requirements of centrifugal pumps in different scenarios. The number of grooves 221 can also be other numbers. Those skilled in the art may make other modifications based on the technical essence of this application, but as long as the functions and effects achieved are the same as or similar to those of this application, they should all be covered within the protection scope of this application.

[0083] In addition, the grooves 221 are evenly distributed along the circumference, which helps to ensure that the probe can sense periodic and equally spaced signal changes when the clamping ring 2 rotates, avoiding signal fluctuations caused by uneven distribution of the grooves 221 and improving the stability of the speed measurement signal.

[0084] In one embodiment, the clamping ring 2 is a metal conductive structure, and the speed measuring adapter is a groove 221 provided on the second ring segment 22. The grooves 221 are distributed at intervals along the circumferential direction of the second ring segment 22, and a non-groove area 222 is formed between two adjacent grooves 221. The distance from the monitoring end 30 of the speed measuring probe 3 to the groove 221 is greater than the distance from the monitoring end 30 of the speed measuring probe 3 to the non-groove area 222.

[0085] In this embodiment, the clamping ring 2 adopts a metal conductive structure to ensure that the alternating magnetic field of the coil built into the speed probe 3 can induce eddy currents on the clamping ring 2, thereby realizing non-contact speed measurement. Non-contact detection can avoid component wear and detection errors caused by mechanical contact, extend the service life of the device, and at the same time ensure the continuity and stability of speed measurement.

[0086] Since the distance from the monitoring end 30 of the speed probe 3 to the groove 221 is greater than the distance from the monitoring end 30 of the speed probe 3 to the non-groove area 222, when the pump shaft 4 drives the clamping ring 2 to rotate, the speed probe 3 can sense periodic electrical parameter changes with significant amplitude differences, ensuring that the external speed measuring instrument can clearly identify the valid signal, avoiding problems such as signal blurring and inability to identify due to excessive distance difference, and improving the effectiveness of the speed measuring signal.

[0087] In one embodiment, the included angle of the central angle formed between the central axes of the first mounting hole 11 and the second mounting hole 12 includes any one of the following: 90°, 60° or 40°.

[0088] In this embodiment, the first mounting hole 11 and the second mounting hole 12 are arranged asymmetrically, that is, the included angle of the central angle formed between the central axes of the first mounting hole 11 and the second mounting hole 12 is not 180°. This allows the speed measuring probe 3 installed in the first mounting hole 11 and the second mounting hole 12 to capture an electrical signal with a fixed and reasonable phase difference. This ensures the accuracy of speed detection and allows for accurate determination of the centrifugal pump rotation direction through changes in phase difference, thus ensuring the reliable implementation of the reverse rotation monitoring function.

[0089] The included angle of the central angle formed between the central axes of the first mounting hole 11 and the second mounting hole 12 includes any one of the following: 90°, 60°, or 40°. Of course, the included angle of the central angle formed between the central axes of the first mounting hole 11 and the second mounting hole 12 can also be other angles, and is not limited to the above description. Those skilled in the art, under the guidance of the technical essence of this application, may make other modifications, but as long as the achieved function and effect are the same as or similar to that of this application, they should all be covered within the scope of protection of this application.

[0090] This application also provides a centrifugal pump, which includes the speed measuring device of the centrifugal pump described above. By setting the speed measuring device of the centrifugal pump, the centrifugal pump can achieve the technical effect achieved by the speed measuring device implementation method of the centrifugal pump. For details, please refer to the specific description of the above implementation method. This application will not repeat it here.

[0091] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0092] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the others. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A speed measuring device for a centrifugal pump, the centrifugal pump having a pump shaft, characterized in that, The speed measuring device for the centrifugal pump includes: a bearing cap, a clamping ring, and a speed measuring probe. The clamping ring is fixedly connected to the pump shaft and can rotate synchronously with the pump shaft. Multiple speed measuring adapters are arranged at intervals along the circumferential direction on the clamping ring. The bearing cap includes a cap body that is integrally shaped as a rotating body. A receiving cavity for accommodating the clamping ring is formed inside the cap body. A first mounting hole and a second mounting hole communicating with the receiving cavity are provided on the side wall of the cap body. The first mounting hole and the second mounting hole are asymmetrically spaced along the circumferential direction. The speed measuring probe is installed in the first mounting hole and the second mounting hole. The speed measuring probe has a monitoring end, which faces the speed measuring adapter of the clamping ring.

2. The speed measuring device for a centrifugal pump as described in claim 1, characterized in that, The cover has a first end close to the pump shaft and a second end away from the pump shaft. The second end is provided with at least one observation hole, which is a through hole that passes through the second end.

3. The speed measuring device for a centrifugal pump as described in claim 2, characterized in that, The observation hole is connected to the first mounting hole and the second mounting hole.

4. The speed measuring device for a centrifugal pump as described in claim 3, characterized in that, The extension line of the first mounting hole and / or the second mounting hole intersects the extension line of the observation hole.

5. The speed measuring device for a centrifugal pump as described in claim 4, characterized in that, The number of observation holes is adapted to the sum of the number of the first mounting holes and the number of the second mounting holes, and one observation hole is provided for each of the first mounting holes and the second mounting holes.

6. The speed measuring device for a centrifugal pump as described in claim 1, characterized in that, The clamping ring includes an annular body, the outer contour of which is stepped with a variable cross-section along the axial direction, including a first ring segment and a second ring segment, the extension lines of the first mounting hole and the second mounting hole intersect with the second ring segment, and a plurality of speed measuring adapters are disposed on the second ring segment.

7. The speed measuring device for a centrifugal pump as described in claim 6, characterized in that, The speed measuring adapter is a groove provided on the second ring segment, and the extension lines of the first mounting hole and the second mounting hole can intersect the groove.

8. The speed measuring device for a centrifugal pump as described in claim 7, characterized in that, The number of grooves is multiple, and the multiple grooves are evenly spaced along the circumference of the clamping ring.

9. The speed measuring device for a centrifugal pump as described in claim 8, characterized in that, The number of grooves is 3N, where N is a positive integer ≥ 1.

10. The speed measuring device for a centrifugal pump as described in claim 6, characterized in that, The clamping ring is a metal conductive structure, and the speed measuring adapter is a groove provided on the second ring segment. The grooves are distributed at intervals along the circumference of the second ring segment, forming a non-groove area between two adjacent grooves. The distance from the monitoring end of the speed measuring probe to the groove is greater than the distance from the monitoring end of the speed measuring probe to the non-groove area.

11. A centrifugal pump, characterized in that, The speed measuring device includes the centrifugal pump described in any one of claims 1-10.

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