A plunger pump with automatic rotation and centering of plunger

Abstract

The application belongs to the technical field of plunger pumps, and particularly discloses a plunger pump with automatic rotation and centering of plunger, which comprises a liquid end and a power end, the power end comprises an intermediate rod and a transmission assembly for driving the intermediate rod to move, the liquid end is connected with a plunger piece, the intermediate rod is fixed with a connecting frame, a universal structure is arranged at the fixed end of the intermediate rod and the connecting frame, the part of the universal structure away from the intermediate rod is connected with the plunger piece, and the universal structure comprises a thrust aligning bearing outer ring fixed on the intermediate rod. The plunger piece and the intermediate rod in the plunger pump are connected through the universal structure, so that not only the huge thrust required for pressurization can be transmitted, but also the plunger piece cannot be stuck in the liquid end, the plunger piece can rotate easily during use, the same part of the plunger piece can be avoided from being repeatedly scraped by hard particles, the plunger piece can be deflected through the magnetic force adjusting assembly, and the plunger piece and the connecting structure can be automatically centered and adjusted.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plunger pumps, and particularly discloses a plunger pump with automatic plunger rotation and centering. BACKGROUND

[0002] The plunger pump is a reciprocating volume pump commonly used in the industrial field and is widely applied to the fields of water injection, hydraulic pressure and pressure boosting. The plunger pump is mainly divided into a power end and a hydraulic end. The power end converts the rotary motion into reciprocating linear motion through a crank connecting rod mechanism, thereby driving the plunger to reciprocate in the hydraulic end, realizing the volume change of the hydraulic end cavity and the pressure boosting function. When the plunger is pushed into the hydraulic end, the volume of the hydraulic end cavity becomes smaller, and the internal medium pressure is increased. At this time, the inlet valve is closed, and the outlet valve is opened due to the pressure difference, thereby realizing the pressure boosting and liquid injection. When the plunger runs in the opposite direction, the volume of the hydraulic end cavity becomes larger, and the internal medium pressure is reduced. At this time, the outlet valve is closed, and the inlet valve is opened, thereby realizing the liquid injection.

[0003] The reciprocating plunger is one of the main wearing parts of the plunger pump, and the service life and reliability of the plunger have a crucial effect on the system operation. The scraping of hard particles and the plunger eccentric wear are two important factors affecting the service life of the plunger.

[0004] When the liquid medium contains hard particles, the hard particles will be stuck between the packing and the plunger, and the hard particles will repeatedly scrape the same part of the plunger, so that the scratches on the surface of the plunger are continuously deepened, thereby causing the medium to leak from between the packing and the plunger, and finally causing the plunger to fail, increasing the frequency of replacement of the packing and the plunger. When the plunger or the cross head is not installed properly, the settlement of the cross head wear will cause the eccentric motion of the intermediate rod and the plunger. At this time, the plunger will be eccentrically worn, thereby accelerating the speed of the plunger eccentric wear and significantly reducing the service life of the plunger and the packing. For the plunger pump with large flow, the diameter of the plunger is large, and the sealing area is large. As long as any part of the plunger is worn, the sealing surface of the plunger will be invalid, thereby causing the entire plunger to be replaced, greatly increasing the maintenance cost. Meanwhile, the plunger of the plunger pump with large flow is more prone to eccentric wear due to the greater weight of the cross head.

[0005] In order to solve the problem that the hard particles in the pressurized medium can cause damage to the plunger, by rotating the use angle of the plunger, the repeated scraping of the hard particles on the same position of the plunger can be effectively alleviated, thereby effectively improving the service life of the plunger. For example, in the existing patent CN202310433374.1, a connecting rod and a crankshaft assembly are connected through a universal coupling, a servo motor and a gear are used in cooperation with the plunger, so as to drive the plunger to rotate. This method can indeed solve the above problems in actual use, but the rotation of the plunger needs to be driven by external power, and the control requirement of external force is high, and there is also axial sliding friction in the process of gear meshing and rotating, which is easy to damage the transmission structure.

[0006] In order to solve the problem of plunger eccentric wear, the existing technical means is to adopt the design of automatic centering of the plunger. The basic principle is to adopt the spherical surface connection of the plunger and the intermediate rod. For example, in the existing patent 200510049904.4, a spherical surface sliding assembly is arranged between the connecting rod and the plunger. However, this method has the following problems: first, the spherical surface sliding assembly in this method is completely pressed by the pressing ring and the snap ring to realize the complete fixed connection of the plunger and the intermediate rod, which causes the movement interference between the snap ring, the plunger and the pressing ring when the plunger rotates along the spherical surface, and the parts are easy to be damaged, and the adjustable angle is very limited; in addition, the spherical surface sliding assembly needs to transmit a large axial thrust during operation, and long-time operation will cause the wear of the spherical contact surface, and then the automatic centering function is lost. SUMMARY

[0007] Therefore, the purpose of the present application is to provide a plunger pump with automatic rotation and centering of the plunger to solve the above problems.

[0008] In order to achieve the above purpose, the present application provides a plunger pump with automatic rotation and centering of the plunger, which comprises a hydraulic end and a power end. The power end comprises an intermediate rod and a transmission assembly for driving the movement of the intermediate rod. The hydraulic end is connected with a plunger. The intermediate rod is fixed with a connecting frame. The intermediate rod and the connecting frame are fixed with a universal structure at one end. The part of the universal structure away from the intermediate rod is connected with the plunger.

[0009] The universal structure comprises a thrust self-aligning bearing outer ring fixed on the intermediate rod. The plunger and the thrust self-aligning bearing outer ring are fixed with a thrust self-aligning bearing inner ring at opposite ends. The thrust self-aligning bearing outer ring and the thrust self-aligning bearing inner ring are embedded with thrust self-aligning bearing rollers.

[0010] The inside of the connecting frame is fixed with a limiting assembly. The limiting assembly and the plunger are connected with a magnetic force adjusting assembly. The magnetic force adjusting assembly is used to adjust the axial thrust of the plunger.

[0011] The end of the plunger and the hydraulic end is fixed with a guide vane, the guide vane is used to drive the plunger to rotate on the connecting frame, and the contact surface adjustment of the plunger and the hard particles in the hydraulic end is realized.

[0012] In the above technical solution, further, the limiting assembly includes an inner magnetic shoe support fixed to the inner wall of the connecting frame, a support sleeve is embedded between the inner magnetic shoe support and the intermediate rod, the axis of the support sleeve coincides with the axis of the intermediate rod, the side of the inner magnetic shoe support close to the intermediate rod is fixed with an anti-collision inner ring, and the anti-collision outer ring is abutted on the anti-collision inner ring.

[0013] In the above technical solution, further, the magnetic force adjusting assembly includes an outer magnetic shoe support fixed to the plunger, the anti-collision outer ring abutting on the anti-collision inner ring and the outer magnetic shoe support are fixed, the side of the outer magnetic shoe support away from the anti-collision outer ring is abutted with a second stop ring, and the second stop ring is fixed to the plunger.

[0014] In the above technical solution, further, the side of the outer magnetic shoe support close to the inner magnetic shoe support is provided with a concave surface, the concave surface of the outer magnetic shoe support is fixed with an outer magnetic ring, the opposite surface of the inner magnetic shoe support and the outer magnetic shoe support is provided with a convex surface, the convex surface of the inner magnetic shoe support is fixed with an inner magnetic ring, and the magnetic poles of the inner magnetic ring and the outer magnetic ring repel each other.

[0015] In the above technical solution, further, the outer magnetic ring is fixed with a first fixing sleeve, the first fixing sleeve is fixedly connected with the outer magnetic shoe support, the inner magnetic ring is fixed with a second fixing sleeve, and the second fixing sleeve is fixed with the inner magnetic shoe support.

[0016] In the above technical solution, further, the plunger is fixed with a first stop ring, and the first stop ring is abutted with the inner ring of the thrust aligning bearing.

[0017] In the above technical solution, further, the opposite surfaces of the outer magnetic ring and the inner magnetic ring are provided with tapered surfaces, the opposite surfaces of the inner magnetic ring and the outer magnetic ring are also provided with tapered surfaces, and the magnetization directions of the outer magnetic ring and the inner magnetic ring are opposite.

[0018] In the above technical solution, further, the opposite surface of the anti-collision outer ring close to the anti-collision inner ring is provided with a tapered surface, the opposite surface of the anti-collision inner ring close to the anti-collision outer ring is also provided with a tapered surface, the tapered surface angle of the anti-collision outer ring is the same as the tapered surface angle of the anti-collision inner ring, and the anti-collision outer ring and the anti-collision inner ring are abutted.

[0019] In the above technical solution, further, the first fixing sleeve and the second fixing sleeve are both non-magnetic, the first fixing sleeve and the second fixing sleeve are both annular structures, and the outer magnetic ring and the inner magnetic ring are not in contact.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1. The plunger part and the intermediate rod in the plunger pump are connected by a universal structure, which can not only transmit the huge thrust required for pressurization, but also can avoid the plunger part from being stuck in the liquid end, ensure the plunger part to rotate easily during use, and avoid the same part of the plunger part from being repeatedly scraped by hard particles. Meanwhile, the plunger part can be deflected by the magnetic force adjusting assembly to realize automatic centering adjustment of the plunger part and the connecting structure.

[0022] 2. The plunger part and the intermediate rod in the plunger pump are connected with the magnetic force adjusting assembly, which can transmit the thrust through the magnetic field in the air. Meanwhile, the magnetic force adjusting assembly is used in cooperation with the universal structure, which can realize the free rotation of the plunger part along the central axis under extremely low resistance, and can make the plunger part smoothly and greatly deflect on the intermediate rod when the plunger part is abraded, so as to facilitate the automatic centering adjustment of the plunger part.

[0023] 3. The plunger part in the plunger pump is provided with the guide vane, which can provide the rotating force for the plunger part through the guide vane when the plunger part reciprocates, so that the plunger part can automatically rotate without the need of introducing external power, and the scraping part of the plunger part can be quickly adjusted.

[0024] 4. The plunger pump is provided with the anti-collision inner ring and the anti-collision outer ring, which can prevent the inner magnetic ring from colliding with the outer magnetic ring when the plunger part is stuck, realize the magnetic repulsion between the inner magnetic ring and the outer magnetic ring, drive the plunger part to be pulled out from the liquid end, and facilitate the plunger part to quickly return to the normal state. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a sectional view of the structure of the present application;

[0026] Figure 2 It is a connection structure diagram of the guide vane and the plunger part in the present application;

[0027] Figure 3 It is a penetration structure diagram of the plunger part and the connecting frame in the present application;

[0028] Figure 4 It is a distribution diagram of the outer magnetic shoe support and the inner magnetic shoe support in the present application;

[0029] Figure 5 It is a distribution diagram of the outer magnetic ring and the inner magnetic ring in the present application;

[0030] Figure 6 It is a connection structure diagram of the inner magnetic ring and the inner magnetic shoe support in the present application;

[0031] Figure 7 It is a connection structure diagram of the outer magnetic ring and the outer magnetic shoe support in the present application.

[0032] 1, hydraulic end; 2, power end; 3, intermediate rod; 4, plunger part; 5, connecting frame; 6, guide vane; 7, thrust aligning bearing outer ring; 8, thrust aligning bearing inner ring; 9, thrust aligning bearing roller; 10, first check ring; 11, outer magnetic shoe support; 12, second check ring; 13, support sleeve; 14, inner magnetic shoe support; 15, outer magnetic ring; 16, inner magnetic ring; 17, first fixed sleeve; 18, second fixed sleeve; 19, anti-collision inner ring; 20, anti-collision outer ring. DETAILED DESCRIPTION

[0033] In order to enable a more clear understanding of the above-mentioned objects, features and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the present application is not limited to the specific embodiments disclosed below.

[0035] Embodiment one: please refer to Figures 1-7 The present application provides a technical solution as shown:

[0036] The present application is a plunger pump with automatic rotation and centering of plunger, comprising a hydraulic end 1 and a power end 2, the power end 2 comprising an intermediate rod 3 and a transmission assembly for driving the intermediate rod 3 to move, the hydraulic end 1 being connected with a plunger part 4, the intermediate rod 3 being fixed with a connecting frame 5, the intermediate rod 3 and the fixed end of the connecting frame 5 being provided with a universal structure, the part of the universal structure away from the intermediate rod 3 being connected with the plunger part 4;

[0037] The universal structure comprises a thrust aligning bearing outer ring 7 fixed on the intermediate rod 3, the plunger part 4 being fixed with a thrust aligning bearing inner ring 8 at the end opposite to the thrust aligning bearing outer ring 7, the thrust aligning bearing outer ring 7 and the thrust aligning bearing inner ring 8 being embedded with a thrust aligning bearing roller 9;

[0038] The inside of the connecting frame 5 is fixed with a limiting assembly, the limiting assembly and the plunger part 4 being connected with a magnetic force adjusting assembly, the magnetic force adjusting assembly being used for adjusting the axial thrust of the plunger part 4;

[0039] The transmission assembly for driving the intermediate rod 3 to move comprises a transmission motor available on the market, the output shaft of the transmission motor being fixedly connected with the crankshaft of the plunger pump through a shaft coupling, the intermediate rod 3 being driven to move through the connecting rod mechanism on the crankshaft, the intermediate rod 3 driving the plunger part 4 to move on the hydraulic end 1 through the limiting assembly;

[0040] The hydraulic end 1 is a component for conveying liquid medium in the existing plunger pump, this part belongs to the known technology and will not be described in detail here.

[0041] The plunger part 4 and the hydraulic end 1 are fixed with a guide vane 6 at one end, the guide vane 6 is used to drive the plunger part 4 to rotate on the connecting frame 5, so as to realize the adjustment of the contact surface between the plunger part 4 and the hard particles in the hydraulic end 1.

[0042] When the transmission assembly drives the plunger part 4 to move in the hydraulic end 1 through the intermediate rod 3, the liquid medium in the hydraulic end 1 will contact the guide vane 6, and the liquid medium flowing in the hydraulic end 1 will drive the plunger part 4 to rotate through the guide vane 6, thereby realizing the adjustment of the contact surface between the plunger part 4 and the hard particles, and avoiding the hard particles in the liquid medium from repeatedly wearing the same part of the plunger part 4.

[0043] When the guide vane 6 drives the plunger part 4 to rotate, the plunger part 4 can drive the thrust self-aligning bearing rollers 9 on the thrust self-aligning bearing outer ring 7 to rotate through the thrust self-aligning bearing inner ring 8, so that the plunger part 4 can stably rotate on the hydraulic end 1. It should be noted that the thrust self-aligning bearing inner ring 8 can rotate in various directions on the thrust self-aligning bearing outer ring 7 through the thrust self-aligning bearing rollers 9.

[0044] Embodiment two: please refer to Figures 1-7 As shown, based on the basis of embodiment one, the application provides a technical solution, which is different from embodiment one. The anti-collision inner ring 19 and the anti-collision outer ring 20 in the embodiment can avoid the axial magnetic force between the inner magnetic ring 16 and the outer magnetic ring 15 from pulling the plunger part 4 when the plunger part 4 suddenly stops running, and can also avoid the inner magnetic ring 16 and the outer magnetic ring 15 from colliding with each other, so as to better protect the inner magnetic ring 16 and the outer magnetic ring 15, and facilitate the repulsive force between the inner magnetic ring 16 and the outer magnetic ring 15 to drive the plunger part 4 to normally run.

[0045] The limiting assembly includes an inner magnetic shoe support 14 fixed on the inner wall of the connecting frame 5, and a support sleeve 13 is embedded between the inner magnetic shoe support 14 and the intermediate rod 3, and the axis of the support sleeve 13 coincides with the axis of the intermediate rod 3. The anti-collision inner ring 19 is fixed on the side of the inner magnetic shoe support 14 close to the intermediate rod 3, and the anti-collision outer ring 20 is abutted on the anti-collision inner ring 19.

[0046] The magnetic force adjusting assembly includes an outer magnetic shoe support 11 fixed on the plunger part 4, the anti-collision outer ring 20 abutting on the anti-collision inner ring 19 and the outer magnetic shoe support 11 are fixed, and the second stop ring 12 is abutted on the side of the outer magnetic shoe support 11 away from the anti-collision outer ring 20. The second stop ring 12 is fixed on the plunger part 4, and the second stop ring 12 can stably connect the outer magnetic shoe support 11 to the plunger part 4;

[0047] The outer magnetic shoe support 11 is provided with a concave surface on the side close to the inner magnetic shoe support 14, and the outer magnetic ring 15 is fixed on the concave surface of the outer magnetic shoe support 11. The opposite surface of the inner magnetic shoe support 14 and the outer magnetic shoe support 11 is provided with a convex surface, and the inner magnetic ring 16 is fixed on the convex surface of the inner magnetic shoe support 14. The magnetic poles of the inner magnetic ring 16 and the outer magnetic ring 15 repel each other.

[0048] The first fixing sleeve 17 is fixed on the outer magnetic ring 15, and the first fixing sleeve 17 is fixedly connected with the outer magnetic shoe support 11. The second fixing sleeve 18 is fixed on the inner magnetic ring 16, and the second fixing sleeve 18 is fixedly connected with the inner magnetic shoe support 14.

[0049] The support sleeve 13 is arranged inside the connecting frame 5 and between the intermediate rod 3 and the inner magnetic shoe support 14, so that the inner magnetic shoe support 14 can be stably connected inside the connecting frame 5. The arrangement of the anti-collision inner ring 19 and the anti-collision outer ring 20 can prevent the axial magnetic force between the inner magnetic ring 16 and the outer magnetic ring 15 from pulling the plunger 4 when the plunger 4 suddenly stops during operation, and can also prevent the inner magnetic ring 16 and the outer magnetic ring 15 from colliding with each other, thereby providing good protection for the inner magnetic ring 16 and the outer magnetic ring 15 and facilitating the normal operation of the plunger 4 driven by the repulsive force between the inner magnetic ring 16 and the outer magnetic ring 15.

[0050] The first retainer 10 is fixed on the plunger 4, and the first retainer 10 abuts against the inner ring 8 of the thrust angular contact bearing. The first retainer 10 can stably connect the inner ring 8 of the thrust angular contact bearing to the plunger 4.

[0051] The opposite surfaces of the inner magnetic ring 16 and the outer magnetic ring 15 are provided with tapered surfaces. The opposite surfaces of the inner magnetic ring 16 and the outer magnetic ring 15 are also provided with tapered surfaces. The magnetization directions of the outer magnetic ring 15 and the inner magnetic ring 16 are opposite, so that there is a stable magnetic repulsive force between the outer magnetic ring 15 and the inner magnetic ring 16.

[0052] The anti-collision outer ring 20 is provided with a tapered surface on the surface close to the anti-collision inner ring 19. The anti-collision inner ring 19 is also provided with a tapered surface on the surface close to the anti-collision outer ring 20. The tapered surface angle of the anti-collision outer ring 20 is the same as that of the anti-collision inner ring 19. The anti-collision outer ring 20 abuts against the anti-collision inner ring 19.

[0053] As shown in Figure 5 The outer magnetic shoe support 11 is fixed on the plunger 4 through the second retainer 12. The outer magnetic ring 15 is fixedly connected with the outer magnetic shoe support 11 through the first fixing sleeve 17. The material of the first fixing sleeve 17 is a non-magnetic material, such as aluminum alloy. Alternatively, the outer magnetic ring 15 is directly fixed on the outer magnetic shoe support 11 by adhesive, and the installation of the first fixing sleeve 17 is omitted. The inner magnetic ring 16 and the outer magnetic ring 15 are tapered rings with angles. The taper angles of the inner magnetic ring 16 and the outer magnetic ring 15 are the same. Figure 5As shown, the taper angle of the outer magnetic ring 15 relative to the central axis is α1, the outer magnetic ring 15 and the inner magnetic ring 16 are made of magnetic material, such as neodymium iron boron, ferrite, etc., and the magnetization direction of the outer magnetic ring 15 and the inner magnetic ring 16 is perpendicular to the taper surface, and the polarity of the two is repulsive. Figure 6 and Figure 7 As shown, the taper surface of the outer magnetic ring 15 and the inner magnetic ring 16 is perpendicular to the taper surface, and the polarity of the two is repulsive.

[0054] In order to facilitate understanding, the perpendicular distance between the taper surface of the inner magnetic ring 16 and the taper surface of the outer magnetic ring 15 is H1, and the value combination of H1 and the taper angle α1 is selected as follows: ① It is necessary to ensure that the repulsive force of the outer magnetic ring 15 from the inner magnetic ring 16 in the axial direction is greater than the resistance of the plunger 4 when the plunger 4 moves to the power end 2 (the friction between the sealing packing and the plunger in the existing plunger pump minus the thrust of the medium acting on the plunger), so as to ensure that the inner magnetic ring 16 and the outer magnetic ring 15 are relatively fixed when the plunger 4 moves to the power end 2, thereby realizing the axial movement of the plunger 4. ② When the inner magnetic ring 16 rotates relative to the outer magnetic ring 15 along the center of the thrust aligning bearing outer ring 7, the inner magnetic ring 16 and the outer magnetic ring 15 will not collide, thereby realizing the aligning centering of the plunger 4 and the intermediate rod 3 in a larger space;

[0055] The anti-collision inner ring 19 and the anti-collision outer ring 20 are coaxially arranged, the two faces closest to each other are taper surfaces, the two taper surfaces have the same taper angle α2, and can be used as the matching surfaces when colliding, the perpendicular distance between the two matching taper surfaces of the anti-collision inner ring 19 and the anti-collision outer ring 20 is H2, the selection value of the taper angle α2 is the same as that of the taper angle α1, and the selection value of H2 is less than the thickness of the second fixed sleeve 18 covering the taper surface of the inner magnetic ring 16 and the thickness of the first fixed sleeve 17 on the taper surface of the outer magnetic ring 15, that is, the distance between the anti-collision inner ring 19 and the anti-collision outer ring 20 is less than the distance between the second fixed sleeve 18 and the first fixed sleeve 17, so that when the plunger 4 is stuck at any position or at any angle, the anti-collision inner ring 19 and the anti-collision outer ring 20 can first contact, thereby avoiding the collision between the inner magnetic ring 16 and the outer magnetic ring 15.

[0056] The first fixed sleeve 17 and the second fixed sleeve 18 are non-magnetic, the first fixed sleeve 17 and the second fixed sleeve 18 are annular structures, and the outer magnetic ring 15 and the inner magnetic ring 16 do not contact;

[0057] In actual use, the plunger 4, the outer magnetic shoe supporting member 11, the thrust aligning bearing inner ring 8 and the thrust aligning bearing roller 9 can deflect along the track ball center of the thrust aligning bearing outer ring 7, thereby realizing automatic centering of the plunger 4. The deflection centering process only needs to overcome the sliding friction between the thrust aligning bearing outer ring 7 and the thrust aligning bearing roller 9. Since the magnetic force of the outer magnetic ring 15 and the inner magnetic ring 16 is used for non-contact transmission of tension, there is no part interference problem in the deflection process, and large-angle centering can be realized.

[0058] Working principle: the transmission assembly driving the movement of the intermediate rod 3 includes a transmission motor available on the market, the output shaft of the transmission motor is fixedly connected with the plunger pump crankshaft through a shaft coupling, the intermediate rod 3 is driven to move by the crank connecting rod mechanism on the crankshaft, and the intermediate rod 3 drives the plunger 4 to move on the hydraulic end 1 through the limiting assembly;

[0059] When the transmission assembly drives the plunger 4 to move inside the hydraulic end 1 through the intermediate rod 3, the liquid medium inside the hydraulic end 1 will contact the guide vane 6, and the liquid medium flowing inside the hydraulic end 1 will drive the plunger 4 to rotate through the guide vane 6, thereby the contact surface adjustment of the plunger 4 and the hard particles can be realized, and the repeated wear of the same part of the plunger 4 by the hard particles in the liquid medium can be avoided;

[0060] When the guide vane 6 drives the plunger 4 to rotate, the plunger 4 can drive the thrust self-aligning bearing rollers 9 on the thrust self-aligning bearing outer ring 7 to rotate through the thrust self-aligning bearing inner ring 8, so that the plunger 4 can stably rotate on the hydraulic end 1, and it should be noted that the thrust self-aligning bearing inner ring 8 can rotate in various directions on the thrust self-aligning bearing outer ring 7 through the thrust self-aligning bearing rollers 9;

[0061] The support sleeve 13 is arranged inside the connecting frame 5 and between the intermediate rod 3 and the inner magnetic shoe support 14, so that the inner magnetic shoe support 14 can be stably connected inside the connecting frame 5, the arrangement of the anti-collision inner ring 19 and the anti-collision outer ring 20 can avoid that the axial magnetic force between the inner magnetic ring 16 and the outer magnetic ring 15 cannot pull the plunger 4 when the plunger 4 suddenly jams during operation, and can also avoid the mutual impact of the inner magnetic ring 16 and the outer magnetic ring 15, so as to better protect the inner magnetic ring 16 and the outer magnetic ring 15, and facilitate the repulsive force between the inner magnetic ring 16 and the outer magnetic ring 15 to drive the plunger 4 to normally operate;

[0062] In actual use, the plunger 4 can be deflected along the track ball center of the thrust self-aligning bearing outer ring 7, so as to realize the automatic centering of the plunger 4, and the deflection centering process only needs to overcome the sliding friction between the thrust self-aligning bearing outer ring 7 and the thrust self-aligning bearing rollers 9, and there is no component movement interference in the deflection process, so that large-angle centering can be realized.

[0063] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A plunger pump with automatic plunger rotation and alignment, comprising a hydraulic end (1) and a power end (2), characterized in that: The power end (2) includes an intermediate rod (3) and a transmission assembly for driving the intermediate rod (3) to move. A plunger (4) is connected to the hydraulic end (1). A connecting frame (5) is fixed on the intermediate rod (3). A universal structure is provided at one end of the intermediate rod (3) and the connecting frame (5). The part of the universal structure that is away from the intermediate rod (3) is connected to the plunger (4). The universal structure includes a thrust self-aligning bearing outer ring (7) fixed on the intermediate rod (3), a thrust self-aligning bearing inner ring (8) fixed at one end opposite to the plunger (4) and the thrust self-aligning bearing outer ring (7), and a thrust self-aligning bearing roller (9) embedded between the thrust self-aligning bearing outer ring (7) and the thrust self-aligning bearing inner ring (8). The connecting frame (5) has a fixed limiting component inside, and a magnetic adjustment component is connected between the limiting component and the plunger (4). The magnetic adjustment component is used to adjust the axial thrust of the plunger (4). A guide vane (6) is fixed at one end through which the plunger (4) and the hydraulic end (1) pass. The guide vane (6) is used to drive the plunger (4) to rotate on the connecting frame (5) to adjust the contact surface of the hard particles inside the plunger (4) and the hydraulic end (1). The limiting component includes an inner magnetic boot support (14) fixed to the inner wall of the connecting frame (5), a support sleeve (13) is embedded between the inner magnetic boot support (14) and the intermediate rod (3), the axis of the support sleeve (13) coincides with the axis of the intermediate rod (3), an anti-collision inner ring (19) is fixed on the side of the inner magnetic boot support (14) near the intermediate rod (3), and an anti-collision outer ring (20) abuts on the anti-collision inner ring (19). The magnetic force adjustment assembly includes an outer magnetic boot support (11) fixed on the plunger (4), an outer anti-collision ring (20) abutting on the inner anti-collision ring (19) and the outer magnetic boot support (11) are fixed, and a second retaining ring (12) abuts on the side of the outer magnetic boot support (11) away from the outer anti-collision ring (20), and the second retaining ring (12) is fixed on the plunger (4); The outer magnetic boot support (11) has a concave surface on the side near the inner magnetic boot support (14), and an outer magnetic ring (15) is fixed on the concave surface of the outer magnetic boot support (11). The inner magnetic boot support (14) and the outer magnetic boot support (11) have a convex surface on the opposite side, and an inner magnetic ring (16) is fixed on the convex surface of the inner magnetic boot support (14). The magnetic poles of the inner magnetic ring (16) and the outer magnetic ring (15) repel each other.

2. The plunger pump with automatic plunger rotation and alignment according to claim 1, characterized in that, The outer magnetic ring (15) is fixed with a first fixing sleeve (17), which is fixedly connected to the outer magnetic boot support (11). The inner magnetic ring (16) is fixed with a second fixing sleeve (18), which is fixed to the inner magnetic boot support (14).

3. A plunger pump with automatic plunger rotation and alignment according to claim 1, characterized in that, The plunger (4) is fixed with a first retaining ring (10), which abuts against the inner ring (8) of the thrust self-aligning bearing.

4. A plunger pump with automatic plunger rotation and alignment according to claim 1, characterized in that, The outer magnetic ring (15) and the inner magnetic ring (16) have a conical surface on their opposite sides, and the inner magnetic ring (16) and the outer magnetic ring (15) also have a conical surface on their opposite sides. The magnetization directions of the outer magnetic ring (15) and the inner magnetic ring (16) are opposite.

5. A plunger pump with automatic plunger rotation and alignment according to claim 1, characterized in that, The outer anti-collision ring (20) has a conical surface on the side near the inner anti-collision ring (19), and the inner anti-collision ring (19) also has a conical surface on the side near the outer anti-collision ring (20). The conical angle of the outer anti-collision ring (20) is the same as that of the inner anti-collision ring (19), and the outer anti-collision ring (20) and the inner anti-collision ring (19) abut against each other.

6. A plunger pump with automatic plunger rotation and alignment according to claim 2, characterized in that, The first fixing sleeve (17) and the second fixing sleeve (18) are both non-magnetic. The first fixing sleeve (17) and the second fixing sleeve (18) are both ring structures. The outer magnetic ring (15) and the inner magnetic ring (16) do not contact each other.

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