Structure for solving overturning problem of plunger pump cylinder body

Abstract

The utility model discloses a structure for solving the overturning problem of a plunger pump cylinder body, and relates to the field of plunger pumps. The plunger pump comprises a cylinder body driven by a driving shaft, a swash plate is connected with a plunger through a sliding shoe, a spring is arranged on the rear portion of the driving shaft in the cylinder body, the driving shaft is connected with the cylinder body through a spline, and the plunger is a hollow plunger or a hollow plunger. By improving the structure of the plunger pump, the problem that the cylinder body overturns due to high-speed operation of the plunger pump is avoided.

Description

TECHNICAL FIELD

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

[0002] In the process of engineering machinery developing towards high speed, the motor gradually replaces the traditional engine, and 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 application scenarios requiring 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] As a key component in engineering machinery, the improvement of the speed of the plunger pump has a direct impact on the efficiency and performance of the whole system. The efficiency of the plunger pump plays an important role in the correlation between the speed and pressure of the pump. The efficiency of the plunger pump determines the efficiency of converting input mechanical power into hydraulic power, and a pump with higher efficiency will convert a higher proportion of input power into useful hydraulic power. With the increase of the speed of the plunger pump, the cylinder body is more likely to overturn after the high-speed rotation of the swash plate type axial plunger pump. Because the plunger rotates with the cylinder body and moves along the cylinder plane in a circular motion, and at the same time, it moves reciprocatingly relative to the cylinder. The combination of the two movements makes the movement trajectory of any point on the plunger axis an ellipse. Cylinder body overturning is a failure that may occur in the plunger pump due to overspeed. The rotating cylinder body may rotate relative to the distribution plate in an overturned posture due to the influence of the axial eccentric load, the plunger centrifugal force and the deflection deformation of the main shaft. When the cylinder spring cannot offset this influence, the cylinder will tilt from the distribution plate, causing the fluid seal between the two components to separate.

[0004] In order to avoid cylinder body overturning, the current swash plate type axial plunger pump mainly uses cylinder spring to offset the cylinder body overturning force. However, the use of spring alone cannot completely avoid the phenomenon of cylinder body overturning. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides a structure for solving plunger pump cylinder body overturning, which improves the structure of the plunger pump to avoid the problem of cylinder body overturning caused by high-speed operation.

[0006] To achieve the above purpose, the application discloses a structure for solving plunger pump cylinder body overturning, the plunger pump comprises a cylinder driven by a drive shaft, a swash plate connected with the plunger through a sliding shoe, a spring arranged at the rear part of the drive shaft in the cylinder, the drive shaft and the cylinder are connected through spline, and the plunger is a hollow plunger or a hollow plunger.

[0007] Further, the outer periphery of the drive shaft is provided with external splines, and the cylinder is provided with internal splines matched with the external splines, and the cross-sectional profile of the external splines and the internal splines at any position in the radial direction is a drum-shaped surface.

[0008] Further, the hollow plunger is coaxially provided with a cylindrical annular cavity in the plunger body.

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

[0010] Further, the cylinder is externally provided with an auxiliary support.

[0011] The beneficial effects of the technical scheme of the utility model

[0012] The application uses the improvement of the structure to propose a comprehensive optimization design scheme for the cylinder overturning failure: the hollow plunger is used to reduce the plunger mass, increase the spring force, and increase the auxiliary support outside the cylinder to offset the overturning force acting on the cylinder. The drum-shaped spline main shaft is used to ensure that the cylinder has good self-positioning ability on the spline and is not prone to overturning and jamming. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. 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 creative labor.

[0014] Figure 1 It is a whole structure schematic view of the utility model;

[0015] Figure 2 It is a spline surface schematic view of the utility model;

[0016] Figure 3 It is a structure schematic view of the hollow plunger in the utility model.

[0017] Figure 4 It is a structure schematic view of the hollow plunger in the utility model.

[0018] Among them: drive shaft-1, cylinder-2, swash plate-3, sliding shoe-4, plunger-5, spring-6, plunger body-51, annular cavity-52, cylindrical cavity-53, drum surface-11. DETAILED DESCRIPTION

[0019] 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 of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0020] Reference Figures 1-3 A structure for solving the overturning of a cylinder of a plunger pump, the plunger pump comprising a cylinder 2 driven by a drive shaft 1, a swash plate 3 connected with a plunger 5 through a sliding shoe 4, a spring 6 arranged at the rear of the drive shaft 1 in the cylinder 2, the drive shaft 1 being connected with the cylinder 2 through a spline, and the plunger 5 being a hollow plunger or a hollow core plunger. An auxiliary support is arranged outside the cylinder 2.

[0021] Preferably, the outer periphery of the drive shaft 1 is provided with an outer spline, and the cylinder 2 is provided with an inner spline matched with the outer spline 1, and the cross-sectional profile of the outer spline and the inner spline at any position in the radial direction is drum-shaped.

[0022] Since the overturning of the cylinder is a possible failure of the plunger pump due to overspeed. The rotating cylinder may rotate relative to the matching plate in an overturned posture due to the influence of the axial eccentric load, the centrifugal force of the plunger and the deflection deformation of the main shaft, and when the cylinder spring cannot offset the influence, the cylinder will tilt from the matching plate, resulting in the separation of the fluid seal between the two components. In combination with the existing structure and process, the comprehensive optimization design scheme for the cylinder overturning failure is proposed: ① the hollow plunger is used to reduce the mass of the plunger. ② the spring force is increased. ③ the auxiliary support is added outside the cylinder to offset the overturning force acting on the cylinder. ④ the drum-shaped spline main shaft is used to ensure that the cylinder has good self-positioning ability on the spline and is not prone to overturning and jamming.

[0023] Reference Figure 3 And 4 A cylindrical annular cavity 52 is coaxially arranged in the plunger body 51 of the hollow plunger. A cylindrical cavity 53 is arranged in the plunger body 51 of the hollow core plunger. The overturning moment is reduced by reducing the weight of the plunger.

[0024] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A structure for solving the problem of piston pump cylinder overturning, the piston pump comprising a cylinder (2) driven by a drive shaft (1), and a swashplate (3) connected to a piston (5) via a slipper (4), characterized in that: The rear part of the driving shaft (1) in the cylinder (2) is provided with a spring (6), the driving shaft (1) is connected with the cylinder (2) through a spline, the plunger (5) is a hollow plunger, the outer periphery of the driving shaft (1) is provided with an outer spline, the cylinder (2) is provided with an inner spline matched with the outer spline, the profile of the outer spline and the inner spline at any position in the radial direction is drum-shaped, and a cylindrical annular cavity (52) is coaxially arranged in the plunger body (51) of the hollow plunger.

2. The structure for solving the problem of the tilting of the plunger pump cylinder according to claim 1, characterized in that: A cylindrical cavity (53) is arranged in the plunger body (51) of the hollow plunger.

3. The structure for solving the problem of the tilting of the plunger pump cylinder according to claim 1, characterized in that: An auxiliary support is arranged outside the cylinder (2).

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