Shield pump axial displacement monitoring device

Abstract

The invention relates to the technical field of monitoring devices, in particular to a shield pump axial displacement monitoring device which comprises a bearing outer ring, a bearing inner ring, a shield pump transmission rod, a self-compensation and monitoring mechanism and a transmission mechanism. A mounting cavity is formed in the bearing outer ring, the self-compensating and monitoring mechanism is arranged in the mounting cavity, the bearing outer ring and the bearing inner ring are combined to form a bearing structure, and through dynamic adjustment of an elastic element in the bearing, abraded balls are always kept in effective contact with the bearing inner ring, axial displacement accumulation caused by gap expansion is avoided, and the service life of the bearing is prolonged. A micro sensor is integrated in the bearing, the displacement compensation amount and axial offset data are directly measured, the anti-interference capability is improved, a linkage ring combination is combined to form a displacement amplification lever mechanism, displacement / pressure double signals are generated through mechanical linkage, and the data reliability is verified in a cross mode.

Description

Technical Field

[0001] The present application relates to the technical field of monitoring devices, and in particular to an axial displacement monitoring device for a shielded pump. Background Art

[0002] With the continuous improvement of the level of modern industrial automation, the status monitoring of various mechanical equipment has become one of the important links to ensure the safe and stable operation of the system. Especially in the chemical and petroleum industries, shielded pumps are widely used in corrosive or dangerous liquid transmission occasions due to their efficient sealing performance. However, in actual work, axial movement problems caused by factors such as bearing wear and uneven rotor force frequently occur, which poses a threat to the reliability of the entire system. Therefore, the research on this phenomenon has gradually deepened, and various types of monitoring mechanisms have been formed to ensure the normal operation of the equipment. These studies have not only promoted the application and promotion of new technologies, but also greatly improved the economic and social benefits of enterprises. At the same time, how to accurately and quickly obtain the dynamic changes inside the shielded pump has also become a key issue that needs to be broken through.

[0003] At present, the common practices in the industry mainly include the following: First, by installing a vibration sensor on the outside of the shielded pump to collect the overall vibration signal and indirectly infer the possible axial deviation; second, using an eddy current probe to directly contact and measure the relative distance of the rotor surface to obtain accurate numerical results; third, using the ultrasonic reflection principle to calculate the time difference to determine the position offset of the target object. The first method is simple and easy, but the accuracy is limited and it is easy to be misjudged by external interference; the second method has higher accuracy, but it may cause component damage and increase maintenance costs due to long-term exposure to harsh working conditions; the third method, despite its non-invasive characteristics, still faces problems such as poor adaptability to complex environments. In summary, it can be seen that each method has certain limitations and cannot fully meet actual needs.

[0004] In the related technologies, the existing shielded pump axial displacement monitoring methods generally have the problems of weak anti-interference ability, short service life or high cost, making it difficult to balance economy and practicality. In addition, some traditional technologies rely on regular manual inspections to detect problems, which obviously does not meet the requirements of modern unmanned factories. Summary of the invention

[0005] In order to solve the problems that existing shielded pump axial displacement monitoring means generally have weak anti-interference ability, short service life or high cost, the present application provides a shielded pump axial displacement monitoring device.

[0006] The present application provides a canned motor pump axial displacement monitoring device that adopts the following technical solution: A canned motor pump axial displacement monitoring device, comprising: The outer ring of the bearing, the inner ring of the bearing is rotatably clamped at the axis of the outer ring of the bearing, and the inner ring of the bearing is sleeved outside the drive rod of the canned motor pump; A self-compensation and monitoring mechanism, which is used for displacement self-compensation and real-time monitoring of axial displacement. An installation cavity is arranged inside the outer ring of the bearing. The self-compensation and monitoring mechanism is arranged in the installation cavity. The self-compensation and monitoring mechanism includes a linkage ring, a sliding groove, a driven rod, a support rod, a ball and a micro sensor. The linkage ring is coaxially and rotatably connected in the installation cavity. The sliding groove is arranged on the linkage ring. One end of the driven rod is slidably clamped in the sliding groove. The support rod is fixed at the other end of the driven rod. The ball is embedded and rolled at one end of the support rod close to the axis of the linkage ring, and the ball is in rolling contact with the outer wall of the drive rod of the canned motor pump. The micro sensor is arranged on the peripheral wall of the linkage ring, and the micro sensor is used to directly measure the axial displacement of the inner ring of the bearing; A transmission mechanism, which is used to drive the overall linkage of the self-compensation and monitoring mechanism. The transmission mechanism is arranged in the installation cavity and is located on one side of the linkage ring.

[0007] By adopting the above technical solutions, a bearing structure is formed by combining the outer ring of the bearing and the inner ring of the bearing. Through the dynamic adjustment of the elastic element inside the bearing, the worn ball is always in effective contact with the inner ring of the bearing, avoiding the accumulation of axial displacement caused by the expansion of the gap. A micro sensor is integrated in the bearing to directly measure the displacement compensation amount and axial offset data, improving the anti-interference ability. Combined with the linkage ring, a displacement amplification lever mechanism is formed, generating displacement / pressure dual signals through mechanical linkage to cross-verify the reliability of the data and greatly reducing the false alarm rate. Through the integration of mechanical structure innovation and intelligent monitoring technology, the present invention systematically solves the problems of reliability, cost and maintenance in the axial displacement monitoring of canned motor pumps, providing a high-cost-effective solution for the condition monitoring of industrial equipment. Optionally, a limiting ring is coaxially fixed in the installation cavity of the outer ring of the bearing. The limiting ring is located on one side of the linkage ring, and a strip-shaped notch perpendicular to the axis is arranged on the limiting ring. The support rod is slidably clamped in the strip-shaped notch.

[0008] By adopting the above technical solutions, the support rod is limited by the limiting ring to make it slide in a fixed direction.

[0009] Optionally, the driven rod and the support rod are detachably connected by screws, and the overall structure formed by the support rod and the ball is provided with a corresponding replacement component.

[0010] By adopting the above technical solutions, by using a detachable and replaceable connection structure, after the ball is worn, it can be disassembled and replaced, avoiding replacing the whole device and reducing economic losses.

[0011] Optionally, the transmission mechanism includes a transmission gear cylinder, a fixed rod, and a transmission gear. The transmission gear cylinder is coaxially fixed on the side of the linkage ring away from the sliding groove. The fixed rod is fixed in the bearing outer ring installation cavity. The transmission gear is rotatably connected to the fixed rod. The inner wall of the transmission gear cylinder is provided with tooth grooves, and the transmission gear meshes with the tooth grooves.

[0012] By adopting the above technical solution, the transmission gear is used to drive the transmission gear cylinder to engage and link, so that the linkage ring can be linked synchronously.

[0013] Optionally, the transmission mechanism further includes a driven gear, an adjusting rod, and a driving gear. The driven gear is rotatably connected to the fixed rod and is fixed to the transmission gear. The adjusting rod is rotatably connected in the installation cavity. The driving gear is coaxially rotatably connected to the adjusting rod, and the driving gear meshes with the driven gear.

[0014] By adopting the above technical solution, the rotation of the driving gear is used to drive the driven gear to engage and link, and then the transmission gear is driven by the driven gear to rotate synchronously.

[0015] Optionally, the transmission mechanism further includes a ratchet ring and a ratchet pawl. The ratchet ring is coaxially fixed on one side of the driving gear, and ratchet teeth are provided on the inner wall of the ratchet ring. One end of the ratchet pawl is fixed to the adjusting rod, and the other end slidably abuts against the ratchet teeth.

[0016] By adopting the above technical solution, the ratchet pawl abuts against the ratchet ring, so that when the adjusting rod rotates, the driving gear can be driven to rotate synchronously.

[0017] Optionally, the transmission mechanism further includes a spiral spring. One end of the spiral spring near the axis is clamped and locked with the adjusting rod, and the other end is sleeved on the fixed rod.

[0018] By adopting the above technical solution, the elastic force generated by the spiral spring is used to automatically drive the adjusting rod and other components to link synchronously after the ball is worn, so that the ball can achieve self-compensating abutment with the bearing inner ring.

[0019] Optionally, a strip-shaped notch is provided on the side wall of the adjusting rod. One end of the spiral spring near the axis is provided with a through hole. A convex block is provided on the inner wall of the through hole, and the convex block is slidably clamped in the strip-shaped notch.

[0020] By adopting the above technical solution, the convex block is used to limit the spiral spring, and the setting of the notch enables the spiral spring to be replaced after the elastic force weakens or disappears.

[0021] Optionally, the sliding groove has an arc structure, and a plurality of the sliding grooves are arranged at equal intervals, and the plurality of sliding grooves are arranged along the axial direction of the linkage ring.

[0022] By adopting the above technical solution, with the arc structure, when the linkage ring rotates, the driven rod can drive the support rod to slide under the limiting action of the sliding groove.

[0023] Optionally, the driving gear and the driving gear have the same diameter, and the overall structure of the tooth groove on the inner wall of the driving gear cylinder is larger than that of the driving gear.

[0024] By adopting the above technical solution, with the gear set of different diameters, the overall output torque of the transmission mechanism is increased, so that the ball can firmly abut against the inner ring of the bearing.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: Using the bearing outer ring and the bearing inner ring to form a bearing structure, and through the dynamic adjustment of the elastic element inside the bearing, the worn ball is always in effective contact with the inner ring of the bearing, avoiding the accumulation of axial displacement caused by the expansion of the gap; Using the micro sensor integrated in the bearing to directly measure the displacement compensation amount and the axial offset data, and the anti-interference ability is improved; Using the linkage ring to form a displacement amplification lever mechanism, generating displacement / pressure dual signals through mechanical linkage, cross-verifying the data reliability, and greatly reducing the false alarm rate. Through the integration of mechanical structure innovation and intelligent monitoring technology, the present invention systematically solves the problems of reliability, cost and maintenance in the axial displacement monitoring of canned motor pumps, and provides a high-cost-effective solution for the condition monitoring of industrial equipment. Description of the Drawings

[0026] Figure 1 is a schematic diagram of the overall external connection structure of an axial displacement monitoring device for a canned motor pump in this embodiment.

[0027] Figure 2 is a schematic diagram of the separated structure of the bearing outer ring and the bearing inner ring in this embodiment.

[0028] Figure 3 is a schematic diagram of the self-compensation and monitoring mechanism structure in this embodiment.

[0029] Figure 4 is a schematic diagram of the connection structure of the limiting ring in this embodiment.

[0030] Figure 5 is a schematic diagram of the support rod and its connection structure in this embodiment.

[0031] Figure 6 is a schematic diagram of the transmission mechanism structure in this embodiment.

[0032] Figure 7 It is a schematic diagram of the spring and its overall connection structure in this embodiment.

[0033] Figure 8 It is a schematic diagram of the connection structure of the driving gear in this embodiment.

[0034] Explanation of reference numerals: 1. Outer ring of bearing; 2. Inner ring of bearing; 3. Drive rod of canned motor pump; 4. Self-compensation and monitoring mechanism; 41. Linking ring; 42. Sliding groove; 43. Driven rod; 44. Support rod; 45. Ball; 46. Micro sensor; 47. Limit ring; 5. Transmission mechanism; 51. Transmission gear cylinder; 52. Fixed rod; 53. Transmission gear; 54. Driven gear; 55. Adjusting rod; 56. Driving gear; 57. Ratchet ring; 58. Pawl; 59. Spring. Detailed implementation manners

[0035] The following further elaborates on this application in conjunction with the attached Figure 1-8 drawings for a more detailed description.

[0036] The embodiment of this application discloses a device for monitoring the axial displacement of a canned motor pump.

[0037] It should be noted that in the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0038] Refer to Figure 1 and Figure 2, A monitoring device for the axial displacement of a canned motor pump, comprising an outer bearing ring 1, an inner bearing ring 2, a drive rod 3 of the canned motor pump, a self-compensation and monitoring mechanism 4, and a transmission mechanism 5. The inner bearing ring 2 is rotatably clamped at the axis center of the outer bearing ring 1. The inner bearing ring 2 is sleeved outside the drive rod 3 of the canned motor pump. An installation cavity is arranged inside the outer bearing ring 1. The self-compensation and monitoring mechanism 4 is arranged in the installation cavity. The transmission mechanism 5 is used to drive the overall linkage of the self-compensation and monitoring mechanism 4. By combining the outer bearing ring 1 and the inner bearing ring 2 to form a bearing structure, and through the dynamic adjustment of the elastic element inside the bearing, the worn balls always maintain effective contact with the inner ring of the bearing, avoiding the accumulation of axial displacement caused by the expansion of the gap. And a micro-sensor 46 is integrated inside the bearing to directly measure the displacement compensation amount and the axial offset data, improving the anti-interference ability. Combining with the linkage ring 41 to form a displacement amplification lever mechanism, generating displacement / pressure dual signals through mechanical linkage to cross-verify the data reliability and greatly reducing the false alarm rate. Through the integration of mechanical structure innovation and intelligent monitoring technology, the present invention systematically solves the problems of reliability, cost, and maintenance in the axial displacement monitoring of canned motor pumps, providing a high-cost-effective solution for the condition monitoring of industrial equipment.

[0039] Refer to Figure 3 , Specifically, the self-compensation and monitoring mechanism 4 includes a linkage ring 41, a sliding groove 42, a driven rod 43, a support rod 44, a ball 45, and a micro-sensor 46. The linkage ring 41 is coaxially rotatably connected in the installation cavity. The sliding groove 42 is arranged on the linkage ring 41. One end of the driven rod 43 is slidably clamped in the sliding groove 42. The support rod 44 is fixed at the other end of the driven rod 43. The ball 45 is embedded and rolled on one end of the support rod 44 close to the axis center of the linkage ring 41, and the ball 45 is in rolling contact with the outer wall of the drive rod 3 of the canned motor pump. The micro-sensor 46 is arranged on the peripheral wall of the linkage ring 41, and the micro-sensor 46 is used to directly measure the axial displacement amount of the inner bearing ring 2.

[0040] Refer to Figure 4 , Specifically, in the embodiment of the present application, a limit ring 47 is coaxially fixed in the installation cavity of the outer bearing ring 1. The limit ring 47 is located on one side of the linkage ring 41, and a strip-shaped notch perpendicular to the axis is arranged on the limit ring 47. The support rod 44 is slidably clamped in the strip-shaped notch to limit the support rod 44 by using the limit ring 47 to make it slide directionally.

[0041] Refer to Figure 5 and Figure 6, specifically, in the embodiment of the present application, regarding the transmission mechanism 5, the transmission mechanism 5 includes a transmission gear cylinder 51, a fixed rod 52, a transmission gear 53, a driven gear 54, an adjusting rod 55 and a driving gear 56. The rotation of the driving gear 56 drives the meshing and linkage of the driven gear 54, and then drives the transmission gear 53 to rotate synchronously through the driven gear 54, and drives the transmission gear cylinder 51 to mesh and link through the transmission gear 53, so that the linkage ring 41 can be linked synchronously.

[0042] The transmission gear cylinder 51 is coaxially fixed on one side of the linkage ring 41 away from the sliding groove 42. The fixed rod 52 is fixed in the installation cavity of the outer ring 1 of the bearing. The transmission gear 53 is rotatably connected to the fixed rod 52. Tooth grooves are provided on the inner wall of the transmission gear cylinder 51, and the transmission gear 53 meshes with the tooth grooves. The driven gear 54 is rotatably connected to the fixed rod 52 and is fixed to the transmission gear 53. The adjusting rod 55 is rotatably connected in the installation cavity, and the driving gear 56 is coaxially rotatably connected to the adjusting rod 55, and the driving gear 56 meshes with the driven gear 54.

[0043] Referring to Figure 7 and Figure 8 , in the embodiment of the present application regarding the transmission mechanism 5, the transmission mechanism 5 further includes a ratchet ring 57, a ratchet pawl 58 and a spring 59. By using the ratchet pawl 58 to abut against the ratchet ring 57, when the adjusting rod 55 rotates, it can drive the driving gear 56 to rotate synchronously, and the spring 59 generates elastic force, so that after the ball 45 is worn, it can automatically drive the adjusting rod 55 and other components to link synchronously, so that the ball 45 can achieve self-compensating abutment with the inner ring 2 of the bearing.

[0044] In the embodiment of the present application, the ratchet ring 57 is coaxially fixed on one side of the driving gear 56, and ratchet teeth are provided on the inner wall of the ratchet ring 57. One end of the ratchet pawl 58 is fixed to the adjusting rod 55, and the other end slides and abuts against the ratchet teeth. One end of the spring 59 near the axis is clamped and locked with the adjusting rod 55, and the other end is sleeved on the fixed rod 52.

[0045] Specifically, in the embodiment of the present application, a strip-shaped notch is provided on the side wall of the adjusting rod 55. A through hole is provided at one end of the spring 59 near the axis, and a convex block is provided on the inner wall of the through hole. The convex block slides and is clamped in the strip-shaped notch to limit the spring 59, and through the setting of the strip-shaped notch, the spring 59 can be replaced after the elastic force weakens or disappears.

[0046] In the embodiment of the present application, the sliding groove 42 has an arc-shaped structure, and a plurality of sliding grooves 42 are equidistantly arranged. The plurality of sliding grooves 42 are arranged along the axial direction of the linkage ring 41. By using the arc-shaped structure, when the linkage ring 41 rotates, the driven rod 43 can drive the support rod 44 to slide under the limiting action of the sliding groove 42.

[0047] The driving gear 53 and the driving gear 56 have the same diameter. The overall structure of the tooth grooves on the inner wall of the driving tooth cylinder 51 is larger than that of the driving gear 53. By using a gear set with different diameters, the overall output torque of the transmission mechanism 5 is increased, so that the ball 45 can firmly abut against the inner ring 2 of the bearing.

[0048] In the embodiment of the present application, regarding the driven rod 43, the driven rod 43 and the support rod 44 are detachably connected by screws, and the overall structure formed by the support rod 44 and the ball 45 is provided with a corresponding replacement component. By using a detachable and replaceable connection structure, after the ball 45 is worn, it can be disassembled and replaced, avoiding replacing the whole device and reducing economic losses.

[0049] The implementation principle of the axial displacement monitoring device of the canned motor pump in the embodiment of the present application is as follows: First, connect and lock the inner ring 2 of the bearing with the transmission rod 3 of the canned motor pump, then rotate the adjusting rod 55 to wind up the spring 59. Driven by the elastic force of the spring 59, the adjusting rod 55 rotates in the reverse direction. At the same time, the pawl 58 drives the ratchet ring 57 and the driving gear 56 to rotate. The driving gear 56 drives the driven gear 54 to engage and link. At the same time, the driving gear 53 rotates. The driving gear 53 drives the driving tooth cylinder 51 to engage and link, and drives the linkage ring 41 to rotate through the driving tooth cylinder 51. At this time, the driven rod 43 drives the support rod 44 to move under the limiting action of the sliding groove 42, and makes the ball 45 abut against the inner ring 2 of the bearing. During monitoring, the displacement compensation amount and the axial offset data can be directly measured by the micro sensor 46.

[0050] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A canned motor pump axial displacement monitoring device, characterized in that: include: A bearing outer ring (1), wherein the bearing outer ring (1) is rotatably clamped with a bearing inner ring (2) at the axis thereof, and the bearing inner ring (2) is sleeved on the outside of a canned pump transmission rod (3); The self-compensation and monitoring mechanism (4) is used for displacement self-compensation and real-time monitoring of axial displacement, and the bearing outer ring (1) is provided with a mounting cavity, the self-compensation and monitoring mechanism (4) is arranged in the mounting cavity, and the self-compensation and monitoring mechanism (4) comprises a linkage ring (41), a sliding groove (42), a driven rod (43), a support rod (44), a ball (45) and a micro sensor (46), the linkage ring (41) is coaxially rotatably connected in the mounting cavity, the sliding groove (42) is arranged on the linkage ring (41), and the One end of the driven rod (43) is slidably engaged in the sliding groove (42), the support rod (44) is fixed to the other end of the driven rod (43), the ball (45) is embedded and rollingly arranged on the support rod (44) at one end close to the axis of the linkage ring (41), and the ball (45) is in rolling contact with the outer wall of the shielded pump transmission rod (3), the micro sensor (46) is arranged on the peripheral wall of the linkage ring (41), and the micro sensor (46) is used to directly measure the axial displacement of the bearing inner ring (2); A transmission mechanism (5), the transmission mechanism (5) is used to drive the self-compensation and monitoring mechanism (4) to be linked as a whole, and the transmission mechanism (5) is arranged in the installation cavity and located on one side of the linkage ring (41).

2. The canned motor pump axial displacement monitoring device according to claim 1 is characterized in that: A limiting ring (47) is coaxially fixed in the mounting cavity of the bearing outer ring (1); the limiting ring (47) is located on one side of the linkage ring (41); and a strip-shaped notch perpendicular to the axial direction is provided on the limiting ring (47); the support rod (44) is slidably engaged in the strip-shaped notch.

3. The canned motor pump axial displacement monitoring device according to claim 1 is characterized in that: The driven rod (43) and the support rod (44) are detachably connected via screws, and the overall structure formed by the combination of the support rod (44) and the ball (45) is provided with a corresponding replacement component.

4. The canned motor pump axial displacement monitoring device according to claim 1 is characterized in that: The transmission mechanism (5) comprises a transmission gear cylinder (51), a fixing rod (52) and a transmission gear (53); the transmission gear cylinder (51) is coaxially fixed to a side of the linkage ring (41) away from the sliding groove (42); the fixing rod (52) is fixed in a mounting cavity of the bearing outer ring (1); the transmission gear (53) is rotatably connected to the fixing rod (52); a tooth groove is provided on an inner wall of the transmission gear cylinder (51), and the transmission gear (53) meshes with the tooth groove.

5. The canned motor pump axial displacement monitoring device according to claim 4 is characterized in that: The transmission mechanism (5) further comprises a driven gear (54), an adjusting rod (55) and a driving gear (56); the driven gear (54) is rotatably connected to the fixing rod (52) and fixed to the transmission gear (53); the adjusting rod (55) is rotatably connected in the mounting cavity; the driving gear (56) is coaxially rotatably connected to the adjusting rod (55), and the driving gear (56) is meshed with the driven gear (54).

6. The canned motor pump axial displacement monitoring device according to claim 5, characterized in that: The transmission mechanism (5) further comprises a ratchet ring (57) and a ratchet pawl (58); the ratchet ring (57) is coaxially fixed to one side of the driving gear (56), and ratchet teeth are arranged on the inner wall of the ratchet ring (57); one end of the ratchet pawl (58) is fixed to the adjusting rod (55), and the other end is in sliding contact with the ratchet teeth.

7. The canned motor pump axial displacement monitoring device according to claim 6 is characterized in that: The transmission mechanism (5) further comprises a spring (59), one end of the spring (59) close to the axis is locked with the adjustment rod (55), and the other end is sleeved on the fixing rod (52).

8. The canned motor pump axial displacement monitoring device according to claim 7 is characterized in that: A strip-shaped notch is provided on the side wall of the adjusting rod (55); a through hole is provided through one end of the mainspring (59) near the axis; a convex block is provided on the inner wall of the through hole; the convex block is slidably engaged in the strip-shaped notch.

9. The canned motor pump axial displacement monitoring device according to claim 1, characterized in that: The sliding groove (42) is in an arc-shaped structure, and a plurality of the sliding grooves (42) are arranged at equal intervals, and the plurality of sliding grooves (42) are arranged axially along the linkage ring (41).

10. The canned motor pump axial displacement monitoring device according to claim 5, characterized in that: The transmission gear (53) and the driving gear (56) have the same diameter, and the overall structure of the tooth groove on the inner wall of the transmission gear cylinder (51) is larger than that of the transmission gear (53).

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