Structure for solving overturning of sliding shoe of plunger pump

Abstract

The utility model discloses a kind of structures for solving plunger pump sliding shoe overturning, involve plunger pump field.The plunger pump includes main shaft, the inclined disc of sleeve setting on the main shaft, and multiple sliding shoes with the working surface of the inclined disc abuts, further include fixed clearance return mechanism, the fixed clearance return mechanism includes return disc and clearance adjusting ring;The return disc is fixed on the inclined disc by screw, clearance adjusting ring is set between return disc and inclined disc;The main shaft and cylinder body adopt arc type's drum spline connection;The sliding shoe and plunger adopt ball head articulation, the plunger can wrap the ball head rotation of the sliding shoe;The plunger is hollow plunger or hollow plunger;The bottom surface of the sliding shoe is plated with wear-resistant layer.Improvement is carried out to the structure of plunger pump, avoid its generation due to bearing from plunger cavity high-pressure oil axial force outside, sliding shoe axial movement causes centrifugal moment to make sliding shoe relative inclined disc surface produce overturning.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of plunger pump especially relates to a structure for solving plunger pump sliding shoe overturning. BACKGROUND

[0002] In the process of engineering machinery developing towards high speed, the motor gradually replaces the traditional engine, this change not only liberates the driving speed limit of the prime mover, but also brings higher efficiency and performance to the whole mechanical system. The high speed characteristic of the motor makes it an ideal power source for engineering machinery, especially in the application scene needing high torque output. One of the most effective ways for the motor to improve power density is to increase the speed, which directly promotes the increase of the speed demand of the plunger pump in the field of engineering machinery.

[0003] The plunger pump high speed will face three major failure problems of cylinder overturning, sliding shoe overturning and cavitation erosion, at present, the highest speed of the large displacement plunger pump of foreign brands Danfoss, Rexroth, Eaton, Linde, domestic brands Hengli, Lixuan etc. is generally not more than 4000 revolutions, the high speed and high pressure have certain limitations on the structure of the plunger pump, the ordinary conventional structure is prone to appear after high speed, such as large noise, friction pair wear aggravation, efficiency reduction, which seriously affects the service life of the plunger pump.

[0004] Among them, the sliding shoe pair is the intermediate link connecting the swash plate and the plunger, in addition to bearing the axial force of the high pressure oil from the plunger cavity, the centrifugal moment caused by the axial movement of the sliding shoe will make the sliding shoe overturn relative to the surface of the swash plate, which is easy to cause the sliding shoe surface to wear out when the high and low pressure of the plunger cavity is switched. INVENTION CONTENTS

[0005] In view of the defects of the prior art, the utility model provides a structure for solving plunger pump sliding shoe overturning, which improves the structure of the plunger pump to avoid the centrifugal moment caused by the axial movement of the sliding shoe relative to the surface of the swash plate.

[0006] To achieve the above purpose, the application discloses a structure for solving plunger pump cylinder overturning, the plunger pump comprises a main shaft, a swash plate sleeved on the main shaft, a plurality of sliding shoes abutting with the working surface of the swash plate, and a fixed clearance return mechanism, the fixed clearance return mechanism comprises a return disc and a clearance adjusting ring; the return disc is fixed on the swash plate through a screw, and the clearance adjusting ring is arranged between the return disc and the swash plate; the main shaft and the cylinder are connected through a drum spline of arc type; the sliding shoe and the plunger are connected through a ball head, and the plunger can rotate around the ball head of the sliding shoe; the plunger is a hollow plunger or a hollow plunger; the bottom surface of the sliding shoe is plated with a wear-resistant layer.

[0007] Further, the bottom surface of the sliding shoe is also coaxially provided with an inner chamfer and forms a concave shape.

[0008] Further, the bottom surface of the sliding shoe is also provided with an outer chamfer.

[0009] Further, the hollow plunger is coaxially provided with a cylindrical annular cavity in the plunger body.

[0010] Further, the hollow plunger is coaxially provided with a cylindrical annular cavity in the plunger body.

[0011] Further, the sliding shoe and the plunger are reversely wrapped spherical hinges.

[0012] Further, the sliding shoe is a multi-cavity independent sliding shoe.

[0013] The beneficial effects of the technical scheme of the utility model

[0014] The utility model improves the anti-overturning capacity of the sliding shoe by increasing the inner and outer chamfers at the bottom of the sliding shoe. The constant-gap return mechanism is used to offset the overturning of the sliding shoe. The coating treatment is added at the bottom of the sliding shoe, which can effectively reduce the friction coefficient of the sliding shoe pair. The hollow or hollow plunger is used to reduce the mass of the plunger to improve the anti-overturning capacity of the sliding shoe. The reversely wrapped plunger is used to reduce the distance between the mass center of the sliding shoe and the center of the spherical hinge, thereby reducing the centrifugal overturning moment of the sliding shoe. The multi-cavity independent sliding shoe is used to improve the anti-overturning capacity of the sliding shoe. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0016] Figure 1 It is a whole structure schematic view of the utility model;

[0017] Figure 2 It is a main shaft structure schematic view of the utility model;

[0018] Figure 3 It is a hollow plunger structure schematic view of the utility model.

[0019] Figure 4 It is a hollow plunger structure schematic view of the utility model.

[0020] Figure 5 It is a sectional view schematic view of the bottom surface of the sliding shoe.

[0021] Figure 6 It is another sectional view schematic view of the bottom surface of the sliding shoe.

[0022] Wherein: main shaft-1, swash plate-2, sliding shoe-3, return plate-4, gap adjustment ring-5, screw-6, cylinder-7, plunger-8, drum spline-9, inner chamfer-31, outer chamfer-32, plunger body-81, annular cavity-82, cylindrical cavity-83. DETAILED DESCRIPTION

[0023] In the description of the present application, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0024] In the description of the present application, it should be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "communication" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements inside. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] The following specific embodiments illustrate the embodiments of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0026] Reference Figures 1-6The application discloses a structure for solving the overturning of a cylinder body of a plunger pump, the plunger pump comprising a main shaft, a swash plate 2 sleeved on the main shaft 1, a plurality of sliding shoes 3 abutting against working surfaces of the swash plate, and a constant-clearance return mechanism, wherein the constant-clearance return mechanism comprises a return disc 4 and a clearance adjusting ring 5; the return disc is fixed on the swash plate 2 through a screw 6, and the clearance adjusting ring 5 is arranged between the return disc 4 and the swash plate 2; the main shaft 1 and the cylinder body 7 are connected through a circular-arc-shaped drum spline 9; the sliding shoe 3 and the plunger 8 are connected through a ball joint, and the plunger 8 can rotate around the ball head of the sliding shoe 3; the plunger 8 is a hollow plunger; and the bottom surface of the sliding shoe 3 is plated with a wear-resistant layer. The sliding shoe and the plunger are connected through a ball joint, the plunger can rotate around the ball head of the sliding shoe, and thus an inverse wrapping structure is formed, the inverse wrapping structure can reduce the distance between the mass center of the sliding shoe and the center of the ball joint, thereby reducing the centrifugal overturning moment of the sliding shoe and improving the overturning resistance of the sliding shoe; a cylindrical annular cavity is coaxially arranged in the plunger body of the hollow plunger, thereby reducing the mass of the plunger, reducing the centrifugal influence of the plunger on the sliding shoe and the cylinder body during movement, and avoiding the overturning problem of the sliding shoe and the cylinder body; and the bottom surface of the sliding shoe is plated with a wear-resistant layer, the wear-resistant layer can reduce the wear degree of the bottom surface of the sliding shoe, reduce the overturning probability of the sliding shoe, and thus improve the service life of the whole plunger pump.

[0027] Preferably, the bottom surface of the sliding shoe 3 is coaxially provided with an inner chamfer 31 and is formed in a concave shape. The bottom surface of the sliding shoe 3 is also provided with an outer chamfer 32. The sliding shoe and the plunger are connected through an inverse wrapping ball joint. The sliding shoe is a multi-cavity independent sliding shoe.

[0028] The bottom surface of the sliding shoe is provided with the inner chamfer, is formed in the concave shape, or is simultaneously provided with the inner and outer chamfers, the anti-overturning capacity of the sliding shoe can be effectively improved, and the dirt holding capacity is also enhanced. The constant-clearance return mechanism is also a new structure for improving the overturning failure of the plunger pump. The coating treatment is added to the bottom surface of the sliding shoe, the friction coefficient of the sliding shoe pair can be effectively reduced. The hollow plunger is used to reduce the mass of the plunger and improve the anti-overturning capacity of the sliding shoe. The wrapping mode of the sliding shoe and the plunger is improved from the common positive wrapping of the sliding shoe ball socket and the plunger ball head to the inverse wrapping of the sliding shoe ball head and the plunger ball socket. The inverse wrapping structure can reduce the distance between the mass center of the sliding shoe and the center of the ball joint, thereby reducing the centrifugal overturning moment of the sliding shoe. The multi-cavity independent supporting sliding shoe is an innovative structure for improving the anti-overturning capacity of the sliding shoe, has the ability of independently and automatically adjusting the supporting rigidity of the sliding shoe pair, improves the anti-overturning capacity of the sliding shoe, and thus avoids the eccentric wear phenomenon of the sliding shoe.

[0029] In another embodiment, a cylindrical annular cavity 82 is coaxially arranged in the plunger body 81 of the hollow plunger. A cylindrical cavity 83 is arranged in the plunger body 81 of the hollow plunger.

[0030] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A structure for solving the overturning of a sliding shoe of a plunger pump, the plunger pump comprising a main shaft, a swash plate (2) sleeved on the main shaft (1), and a plurality of sliding shoes (3) abutting against the working surface of the swash plate, characterized in that: the swash plate (2) is provided with a plurality of sliding shoe supporting grooves (4) arranged in a staggered manner, and the sliding shoe supporting grooves (4) are arranged in a staggered manner. It also comprises a constant clearance return mechanism, which comprises a return disc (4) and a clearance adjusting ring (5); the return disc is fixed on the swash plate (2) by a screw (6), and the clearance adjusting ring (5) is arranged between the return disc (4) and the swash plate (2); the main shaft (1) and the cylinder body (7) are connected by a drum spline (9) in an arc shape; the slide shoe (3) and the plunger (8) are connected by a ball joint, the plunger (8) can rotate around the ball head of the slide shoe (3); the plunger (8) is a hollow plunger; the bottom surface of the slide shoe (3) is plated with a wear-resistant layer.

2. The structure for solving the problem of the sliding shoe overturning of the plunger pump according to claim 1, characterized in that: The bottom surface of the slide shoe (3) is also coaxially provided with an inner chamfer (31) and forms a concave shape.

3. The structure for solving the problem of the sliding shoe overturning of the plunger pump according to claim 1, characterized in that: The bottom surface of the slide shoe (3) is also provided with an outer chamfer (32).

4. The structure for solving the problem of the sliding shoe overturning of the plunger pump according to claim 1, characterized in that: The plunger body (81) of the hollow plunger is coaxially provided with a cylindrical annular cavity (82) inside.

5. The structure for solving the problem of the sliding shoe overturning of the plunger pump according to claim 1, characterized in that: The plunger body (81) of the hollow plunger is provided with a cylindrical cavity (83) inside.

6. The structure for solving the problem of the sliding shoe overturning of the plunger pump according to claim 1, characterized in that: The slide shoe and the plunger are connected by a reverse wrap ball joint.

7. The structure for solving the problem of the sliding shoe overturning of the plunger pump according to claim 1, characterized in that: The slide shoe is a multi-cavity independent slide shoe.

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