Anti-loosening firm nut of centrifugal pump
By installing self-locking nuts and anti-loosening washers at the upper and lower ends of the centrifugal pump tie rod, the problem of easy loosening of the tie rod is solved, the stability and reliability of the connection between the motor and the pump body are achieved, and the reliability of the centrifugal pump is improved.
Patent Information
- Application Number
- CN202520859419.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-04-30
AI Technical Summary
In existing centrifugal pumps, the lower end of the tie rod lacks an effective anti-loosening structure, which makes it prone to loosening, resulting in unstable connection between the motor and the pump body and affecting the reliability of use.
An upper nut locking structure and a lower nut locking structure are respectively set at the upper and lower ends of the centrifugal pump pull rod, including components such as self-locking nuts, spring washers, flat washers and double-layered anti-loosening washers. The design of self-locking nuts and anti-loosening washers enhances the contact friction between the nut and the pull rod, and the deformation airbag automatically compensates for the preload loss.
It effectively prevents the tie rod from loosening, improves the reliability of the connection between the motor and the pump body, enhances the stability of the centrifugal pump, and reduces the impact of vibration on the threaded connection.
Smart Images
Figure CN223908593U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to centrifugal pump technical field, concretely is centrifugal pump anti -loosening firm nut. BACKGROUND
[0002] In the production and assembly process of centrifugal pump, the connection of motor and pump body usually adopts vertical installation structure, that is, the motor is located above the pump body, and torque transmission is realized through hollow shaft sleeve and pump shaft. In this structure, the motor flange and the pump shell are fixed concentrically by pull rod. In the prior art, the lower end of the pull rod is usually directly screwed into the threaded hole on the pump body, and the upper end of the pull rod is connected with the motor flange by using the combination of nut + elastic pad + flat pad. This fixing mode of the pull rod makes the threaded connection of the lower end of the pull rod prone to wear due to motor working vibration, but the lower end of the pull rod cannot have an anti-loosening structure like the upper end, so in the continuous vibration caused by motor working, the threaded connection of the pull rod and the pump body is prone to loosening, and this loosening will further intensify the impact of vibration on threaded connection, forming a vicious cycle, which finally affects the use reliability of the centrifugal pump. Based on this, the present application proposes a centrifugal pump anti-loosening firm nut. SUMMARY
[0003] The utility model provides a centrifugal pump anti-loosening firm nut, solves the problem of lacking effective anti-loosening structure at the lower end of the pull rod in the above background technology and being prone to loosening.
[0004] The utility model provides the following technical scheme: a centrifugal pump anti-loosening firm nut, which comprises an upper nut locking structure and a lower nut locking structure, the upper nut locking structure is arranged at the upper end of the centrifugal pump pull rod, the upper nut locking structure comprises a self-locking nut, an elastic pad and a flat pad, the elastic pad is located between the self-locking nut and the flat pad, and the lower end surface of the flat pad is in surface contact with the centrifugal pump motor support; the lower nut locking structure is arranged below the centrifugal pump pull rod, the lower nut locking structure comprises another self-locking nut and a double-stacked anti-loosening gasket, the double-stacked anti-loosening gasket is located between the other self-locking nut and the centrifugal pump body, and the lower surface of the double-stacked anti-loosening gasket is closely attached to the centrifugal pump body.
[0005] The double-stacked anti-loosening gasket comprises two gasket bodies, the outer part of the gasket body is provided with a radial convex grain surface, the inner side of the gasket body is a bevel gear surface, and the inclination angle of the bevel gear surface is greater than the thread angle of the centrifugal pump pull rod.
[0006] Preferably, the outer diameter of the flat pad is greater than the outer diameter of the self-locking nut, and the outer surface of the flat pad is provided with an anti-slip pattern.
[0007] Preferably, the outer diameter of the elastic pad is not greater than the outer diameter of the self-locking nut, and the elastic pad is designed with gradually changing thickness in cross section.
[0008] Preferably, the self-locking nut comprises a nut body threaded with the end of the ion pump pull rod, a deformation air bag connected with the top of the nut body, and a screw pressing part connected with the top of the deformation air bag, the screw pressing part is connected with the self-locking nut through a connecting structure, and the screw pressing part is movably connected with the centrifugal pump pull rod.
[0009] Preferably, the deformation air bag is externally provided with a protective sleeve, one end of the protective sleeve is connected with the nut body, and the other end of the protective sleeve is connected with the screw pressing part.
[0010] Compared with the prior art, the centrifugal pump anti-loosening strong nut has the following beneficial effects:
[0011] 1. The centrifugal pump anti-loosening strong nut is characterized in that the nut locking structure is arranged at the upper end and the lower end of the centrifugal pump pull rod, so that the upper end and the lower end of the pull rod can effectively realize anti-loosening, the probability of loosening of the pull rod is reduced, and the reliability of the connection between the centrifugal pump body and the motor is improved.
[0012] 2. The centrifugal pump anti-loosening strong nut is characterized in that the self-locking nut is arranged, the deformation air bag is tightly attached to the surface of the centrifugal pump pull rod, the contact friction between the nut body and the pull rod is enhanced, the self-locking of the nut body is realized, the deformation air bag can automatically compensate when the pre-tightening force is lost due to vibration or thermal deformation, the contact pressure is maintained, and the reliability of the self-locking nut is improved. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a position schematic view of the structure of the utility model on the centrifugal pump pull rod;
[0014] Figure 2 It is a front view schematic view of the structure of the utility model;
[0015] Figure 3 It is a self-locking nut schematic view of the structure of the utility model;
[0016] Figure 4 It is a self-locking nut cross-sectional schematic view of the structure of the utility model;
[0017] Figure 5 It is a self-locking nut explosion schematic view of the structure of the utility model;
[0018] Figure 6 It is a use schematic view of the structure of the utility model.
[0019] In the figure: 1, self-locking nut; 2, elastic pad; 3, flat pad; 4, nut body; 5, washer body; 6, screw pressing part; 7, protective sleeve; 8, deformation air bag; 9, centrifugal pump body; 10, fixing groove; 11, bearing one; 12, bearing two; 13, spring; 14, magnetic block; 15, connecting rod; 16, clamping block; 17, through hole; 18, limiting ring; 19, centrifugal pump motor support. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0021] The embodiments of the utility model provide: please refer to Figures 1-6 The centrifugal pump anti-loosening firm nut comprises an upper nut locking structure and a lower nut locking structure, the upper nut locking structure is arranged at the upper end of the centrifugal pump pull rod, the upper nut locking structure adopts a three-stage anti-loosening structure, and the three-stage anti-loosening structure comprises a self-locking nut 1, an elastic pad 2 and a flat pad 3; the elastic pad 2 is located between the self-locking nut 1 and the flat pad 3; the lower end surface of the flat pad 3 is in surface contact with the centrifugal pump motor support; the outer diameter of the elastic pad 2 is not greater than that of the self-locking nut 1; the elastic pad 2 is designed in a gradually changing thickness cross section, and the thickness of the middle part of the elastic pad 2 is greater than that of the edge part; in this way, the rigidity of the elastic pad 2 changes nonlinearly under different compression amounts, so that the elastic pad 2 can adapt to multiple frequency vibrations, the reliability of the connection between the centrifugal pump motor and the pump body is improved, the outer diameter of the flat pad 3 is greater than that of the self-locking nut 1, so that the stress of the upper nut locking structure can be evenly distributed, the outer surface of the flat pad 3 is provided with anti-skid lines, the anti-skid lines can be wave concave-convex lines and the like, which are not limited herein, the friction between the flat pad 3 and the centrifugal pump motor support is improved, and then the anti-loosening performance of the upper nut locking structure is improved. The sizes of the flat pad 3 and the elastic pad 2 can be designed according to requirements, which are not limited herein.
[0022] The lower nut locking structure is arranged below the pull rod of the centrifugal pump, and the lower nut locking structure comprises another self-locking nut 1 and a double-stacked anti-loosening washer. The double-stacked anti-loosening washer is located between the another self-locking nut 1 and the centrifugal pump body, and the lower surface of the double-stacked anti-loosening washer is tightly attached to the centrifugal pump body. The double-stacked anti-loosening washer comprises two washer bodies 5. The outer part of the washer body 5 is provided with a radial relief surface. The inner side of the washer body 5 is a bevel gear surface, and the inclination angle of the bevel gear surface is greater than the thread angle of the centrifugal pump pull rod. The size of the washer body 5 can be set according to requirements, which is not limited herein. In use, the double-stacked anti-loosening washer can be embedded into the surface of the another self-locking nut and the centrifugal pump body to form mechanical interlocking. The double-stacked anti-loosening washer can generate a continuous axial elastic restoring force to automatically compensate for the loss of pre-tightening force and reduce the probability of loosening of the another self-locking nut.
[0023] The self-locking nut 1 comprises a nut body 4 threadedly connected to the end of the pull rod of the centrifugal pump, a deformation air bag 8 connected to the top of the nut body 4, and a screwing and pressing part 6 connected to the top of the deformation air bag 8. The screwing and pressing part 6 is connected to the self-locking nut 1 through a connecting structure, and the screwing and pressing part 6 is movably connected to the pull rod of the centrifugal pump. Through the arrangement of the screwing and pressing part 6, the user can press the screwing and pressing part 6 to deform the deformation air bag 8, so that the deformation air bag 8 can be tightly attached to the surface of the pull rod of the centrifugal pump, thereby enhancing the contact friction force between the nut body 4 and the pull rod, achieving self-locking of the nut body 4, and when the pre-tightening force is lost due to vibration or thermal deformation, the deformation air bag 8 can automatically compensate to maintain the contact pressure. The material of the deformation air bag 8 can be set according to requirements, which is not limited herein. In an embodiment of the present application, the material of the deformation air bag 8 is graphene reinforced rubber.
[0024] The deformation air bag 8 is provided with a protective sleeve 7. One end of the protective sleeve 7 is connected to the nut body 4, and the other end of the protective sleeve 7 is connected to the screwing and pressing part 6. Through the arrangement of the protective sleeve 7, the protective sleeve 7 can protect the deformation air bag 8, reduce the probability of damage to the deformation air bag 8, and prolong the service life of the deformation air bag 8. The protective sleeve 7 can be compressed under external pressure, thereby solving the limitation of the protective sleeve 7. The protective sleeve 7 can restore to its original state. The material of the protective sleeve 7 can be rubber, and the material of the protective sleeve 7 can be set according to requirements, which is not limited herein.
[0025] In one embodiment of the present application, the deformation air bag 8 is connected with the screwing pressing part 6 through bearing one 11, the protective sleeve 7 is connected with the screwing pressing part 6 through bearing two 12, the top end of the nut body 4 is provided with a fixed groove 10, the connecting structure comprises a clamping block 16 connected with the inner cavity bottom of the fixed groove 10 uniformly, a magnetic attraction block 14 connected with the top end of the fixed groove 10, and a limiting ring 18 movably connected with the inner cavity of the fixed groove 10, the limiting ring 18 is located between the clamping block 16 and the magnetic attraction block 14, the limiting ring 18 is uniformly provided with a through hole 17 matched with the clamping block 16, the magnetic attraction block 14 is connected with the bearing two 12 through a spring 13, the limiting ring 18 is connected with the screwing pressing part 6 through a connecting rod 15, the connecting rod 15 is movably connected with the inner cavity of the fixed groove 10, and the bottom end of the connecting rod 15 is provided with a clamping groove matched with the clamping block 16.
[0026] When the screwing pressing part 6 is pressed, the screwing pressing part 6 can drive the connecting rod 15 to move downward, the connecting rod 15 can drive the limiting ring 18 to move downward, until the limiting ring 18 is tightly attached to the bottom of the fixed groove 10, at this time, the end of the clamping block 16 close to the screwing pressing part 6 moves above the limiting ring 18 through the through hole 17, and the end of the clamping block 16 close to the screwing pressing part 6 is at the same height as the clamping groove, when the user rotates the screwing pressing part 6, the screwing pressing part 6 drives the connecting rod 15 to rotate, the clamping block and the end of the clamping block 16 close to the screwing pressing part 6 can be clamped, the position of the screwing pressing part 6 is fixed, and under the action of the elastic force of the spring 13, the connecting rod 15 and the clamping block 16 are tightly attached, avoiding the rotation of the screwing pressing part 6 under the vibration, in addition, the limiting ring 18, the bottom of the fixed groove 10 and the magnetic attraction block 14 are all in the state of magnetic attraction, further improving the stability of the position of the screwing pressing part 6, the bottom of the fixed groove 10 is provided with a permanent magnet, the material of the magnetic attraction block 14 is a permanent magnet, and the material of the limiting ring 18 is a ferromagnetic metal.
[0027] In summary: the centrifugal pump anti-loosening strong nut is used, like Figure 6As shown, two self-locking nuts 1 are used at both ends of the pull rod of the centrifugal pump, wherein the upper end of the pull rod is a combination of self-locking nut 1 (main nut) + elastic pad 2 + flat pad 3, and the lower end of the pull rod is a combination of self-locking nut 1 (secondary nut) + double-stacked anti-loosening washer. When installing, the self-locking nut is first screwed into the lower end of the pull rod, and then the double-stacked anti-loosening washer is sleeved, the pull rod is screwed into the threaded hole of the centrifugal pump body 9 for connection, at this time the self-locking nut at the lower end of the pull rod is not tightened, the flat pad 3, the elastic pad 2 and the main nut are sleeved on the upper end of the pull rod after the pull rod is sleeved on the centrifugal pump motor support 19, and the upper end of the pull rod is fixed, then the self-locking nut 1 at the lower end of the pull rod is screwed, until the self-locking nut 1 at the lower end of the pull rod is tightened, the centrifugal pump body and the motor are reliably connected. And after the self-locking nut 1 is tightened, the user presses and twists the pressing part 6 downward until the limiting ring 18 tightly fits the bottom of the fixing groove 10, at this time the end of the clamping block 16 close to the twisting pressing part 6 moves above the limiting ring 18 through the through hole 17, and the end of the clamping block 16 close to the twisting pressing part 6 is at the same height as the clamping groove, when the user rotates the twisting pressing part 6, the twisting pressing part 6 drives the connecting rod 15 to rotate, the clamping block and the end of the clamping block 16 close to the twisting pressing part 6 can be clamped, the position of the twisting pressing part 6 is fixed, at this time the deformed air bag 8 tightly fits the pull rod, the surface of the centrifugal pump pull rod can tightly fit, the contact friction force between the nut body 4 and the pull rod is enhanced, the self-locking of the nut body 4 is realized, and the reliability of the connection between the centrifugal pump body and the motor is further improved.
[0028] The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each structure adopts the conventional technical means such as bolt connection in the prior art, the machinery, parts and equipment adopt the conventional models in the prior art, which will not be described in detail here, the contents not described in detail in the description belong to the prior art known to the person skilled in the art, although the embodiments of the utility model have been shown and described, it can be understood by the person skilled in the art that the embodiments can be changed, modified, replaced and modified in various ways without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A centrifugal pump anti-loose solid nut, comprising an upper nut locking structure and a lower nut locking structure, characterized in that: The upper nut locking structure is arranged at the upper end of the centrifugal pump pull rod, and comprises a self-locking nut (1), an elastic pad (2) and a flat pad (3), the elastic pad (2) is located between the self-locking nut (1) and the flat pad (3), and the lower end surface of the flat pad (3) is in surface contact with the centrifugal pump motor support; the lower nut locking structure is arranged below the centrifugal pump pull rod, and comprises another self-locking nut (1) and a double-stacked anti-loosening gasket, the double-stacked anti-loosening gasket is located between the other self-locking nut (1) and the centrifugal pump body, and the lower surface of the double-stacked anti-loosening gasket is tightly attached to the centrifugal pump body.
2. The anti-loose locking nut for centrifugal pumps according to claim 1, characterized in that: The double-stacked anti-loosening gasket comprises two gasket bodies (5), the outer part of the gasket body (5) is provided with a radial convex surface, the inner side of the gasket body (5) is a bevel gear surface, and the inclination angle of the bevel gear surface is greater than the thread angle of the centrifugal pump pull rod.
3. The anti-loose locking nut for centrifugal pumps according to claim 1, characterized in that: The outer diameter of the flat pad (3) is greater than the outer diameter of the self-locking nut (1), and the outer surface of the flat pad (3) is provided with an anti-skid pattern.
4. The anti-loose locking nut for centrifugal pumps according to claim 1, characterized in that: The outer diameter of the elastic pad (2) is not greater than the outer diameter of the self-locking nut (1), and the elastic pad (2) is designed with a gradually changing thickness cross section.
5. The anti-loose locking nut for centrifugal pumps according to claim 1, characterized in that: The self-locking nut (1) comprises a nut body (4) threadedly connected with the end of the ion pump pull rod, a deformation air bag (8) connected with the top of the nut body (4), and a screw pressing part (6) connected with the top of the deformation air bag (8), the screw pressing part (6) is connected with the self-locking nut (1) through a connecting structure, and the screw pressing part (6) is movably connected with the centrifugal pump pull rod.
6. The anti-loose locking nut for centrifugal pumps according to claim 5, characterized in that: The deformation air bag (8) is provided with a protective sleeve (7) on the outside, one end of the protective sleeve (7) is connected with the nut body (4), and the other end of the protective sleeve (7) is connected with the screw pressing part (6).