CN111946575A

CN111946575A - Variable system of floating cup type axial plunger pump

Info

Publication number: CN111946575A
Application number: CN202010961990.0A
Authority: CN
Inventors: 何皓; 杨国来; 柴红强; 董季澄; 郭霁贤
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2020-11-17

Abstract

The invention discloses a variable system of a floating cup type axial plunger pump, which comprises a transmission shaft, a plunger disc, two variable swash plates and a floating cup pump mechanism, wherein the plunger disc is arranged on the transmission shaft in an externally sleeved mode, the two variable swash plates are externally sleeved on the transmission shaft and are respectively arranged on two sides of the plunger disc, and the floating cup pump mechanism is arranged between the variable swash plates and the plunger disc; the variable system of the floating cup type axial plunger pump adopts the technical scheme that the servo motor drives the ball screw to realize reciprocating linear motion, so that the variable swash plate is driven to change the inclination angle of the variable swash plate, the variable of the floating cup pump is realized, the precise control of the variable can be realized by utilizing the characteristics of the ball screw of a precise control element, and the self-locking of the structure of the ball screw connected by the servo motor can be realized, so that the implementation process is simple and the reliability is high.

Description

Variable system of floating cup type axial plunger pump

Technical Field

The invention relates to the field of plunger pumps, in particular to a variable system of a floating cup type axial plunger pump.

Background

The plunger pump is an important device of a hydraulic system, and realizes oil absorption and oil pressing by changing the volume of a sealed working cavity through the reciprocating motion of a plunger in a cylinder body. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like.

The novel axial plunger pump with the floating cup type structure invented by Innas of the Netherlands well integrates the advantages of the traditional structure, and has certain advantages in the aspects of improving flow pulsation, improving working efficiency, reducing noise, reducing abrasion and the like compared with the traditional structure. The variable floating cup pump has the characteristics of high efficiency, small torque loss and good starting performance, so the variable floating cup pump has wide application prospect in heavy-duty automobile equipment and industrial equipment. But it adopts a variable manner in the form of a valve-controlled plunger (similar to a valve-controlled cylinder), and hydraulic oil has compressibility, so that it is difficult to achieve precise control when controlling variables.

There is a need for a variable displacement system for a floating cup axial plunger pump that addresses the above-mentioned problems.

Disclosure of Invention

In view of the above, the variable system of the floating cup type axial plunger pump provided by the invention has the advantages that the structure is simple, the operation is convenient, the product research and development cost is greatly reduced, the servo motor drives the ball screw to realize reciprocating linear motion, so that the variable swash plate is driven to change the inclination angle of the variable swash plate, the variable of the floating cup pump is realized, the precise control of the variable can be realized by utilizing the characteristics of the ball screw of a precise control element, the self-locking can be realized by connecting the servo motor with the ball screw, the implementation process is simple, and the reliability is high.

A variable system of a floating cup type axial plunger pump comprises a transmission shaft, a plunger disc arranged on the outer sleeve of the transmission shaft, two variable swash plates arranged on the outer sleeve of the transmission shaft and respectively arranged on two sides of the plunger disc, and a floating cup pump mechanism arranged between the variable swash plates and the plunger disc; the utility model discloses a floating cup type axial plunger pump, including two variable sloping cam plates, a servo motor, two variable sloping cam plates, a deflection mechanism, a deflection system, simple structure, and convenient operation, very big reduction the cost of product research and development, drive ball screw through servo motor and realize reciprocating linear motion, thereby it changes its inclination to drive the variable sloping cam plate, realize the variable of floating cup pump, utilize the characteristics of precision control component ball screw, can realize the accurate control of variable, and servo motor connects ball screw structure and can realize the auto-lock, the implementation process is simple, and the reliability is high.

Furthermore, the deflection mechanism comprises a driving motor, a ball screw nut pair connected with the output end of the driving motor, a variable push rod connected with a nut sleeve of the ball screw nut pair and two swash plate push rods; namely, the servo motor 11 drives the screw rod to rotate so as to drive the nut sleeve to do linear reciprocating motion, the nut sleeve 15 drives the variable push rod 21 to do motion so as to push the swash plate push rod 5 to do motion, and finally the variable swash plate is driven to realize rotation.

Further, the one end of two sloping cam plate push rods is articulated with two variable sloping cam plates respectively, and the other end of two sloping cam plate push rods articulates in variable push rod tip and two sloping cam plate push rods for plunger plate symmetrical arrangement, and variable push rod one end is connected the setting with the nut cover, and the other end realizes articulatedly with two sloping cam plate push rods, and sloping cam plate push rod tip is provided with articulated journal stirrup, is convenient for with variable sloping cam plate location installation, overall structure is simple, simple to operate, and control is accurate.

Furthermore, the bottoms of the two variable swash plates are connected and provided with return springs.

Further, the floating cup pump mechanism comprises a valve plate which is attached to the variable swash plate, a roller plate which is coaxial with the valve plate, and a floating cup assembly which is arranged between the roller plate and the plunger plate. The floating cup components are symmetrically arranged between the two variable swash plates and the plunger plate relative to the plunger plate, so that the stress of the floating cup components is more balanced in the working process.

Further, the floating cup assembly comprises a plurality of floating cups uniformly arranged along the circumferential direction of the roller plate and a plurality of plungers uniformly arranged along the circumferential direction of the plunger disc; the plungers are arranged in one-to-one correspondence with the floating cups. A plurality of mounting points are arranged on the roller plate along the circumferential direction, the floating cups are uniformly arranged on the mounting points at intervals, a plurality of mounting positions for mounting the plungers are correspondingly arranged on the plunger disc, the plungers are fixedly mounted on the plunger disc at uniform intervals, and the integral structure is convenient to mount.

Further, the floating cup is sleeved on the plunger and can deflect relative to the plunger along the axial direction.

Furthermore, the two floating cup mechanisms are symmetrically arranged relative to the plunger disc.

Furthermore, an elastic pressing sheet used for limiting the floating cup is arranged between the plunger disc and the roller plate.

The invention has the beneficial effects that:

the variable system of the floating cup type axial plunger pump is simple in structure and convenient to operate, the product research and development cost is greatly reduced, the servo motor drives the ball screw to realize reciprocating linear motion, so that the variable swash plate is driven to change the inclination angle of the variable swash plate, the variable of the floating cup pump is realized, the precise control of the variable can be realized by utilizing the characteristic of the ball screw of a precise control element, and the self-locking can be realized by connecting the servo motor with the ball screw, so that the implementation process is simple and the reliability is high.

Drawings

The invention is further described below with reference to the following figures and examples:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a schematic view of a variable push rod according to the present invention;

FIG. 4 is a schematic view of the structure of the swashplate pushrod of the present invention.

Detailed Description

FIG. 1 is a schematic structural view of the present invention; FIG. 2 is a top view of the present invention; FIG. 3 is a schematic view of a variable push rod according to the present invention; fig. 4 is a schematic structural diagram of a swash plate push rod of the present invention, and as shown in the figure, a variable displacement system of a floating cup type axial plunger pump includes a transmission shaft 1, a plunger disc 9 sleeved on the transmission shaft 1, two variable swash plates 4 sleeved on the transmission shaft 1 and respectively disposed on two sides of the plunger disc 9, and a floating cup pump mechanism disposed between the variable swash plates and the plunger disc; a deflection mechanism for driving the two variable swash plates to rotate relatively is arranged between the two variable swash plates; this technical scheme's floating cup formula axial plunger pump's variable system, simple structure, the operation of being convenient for, very big reduction the cost of product research and development, drive ball screw through servo motor and realize reciprocating linear motion to drive the variable sloping cam plate and change its inclination, realize the variable of floating cup pump, utilize the characteristics of precision control component ball screw, can realize the accurate control of variable, and servo motor connects ball screw structure and can realize the auto-lock, and the implementation process is simple, and the reliability is high.

In this embodiment, the deflection mechanism includes a driving motor, a ball screw nut pair connected to an output end of the driving motor, a variable push rod connected to a nut sleeve of the ball screw nut pair, and two swash plate push rods. The driving motor adopts a servo motor 11 with a self-locking function, and the output end of the servo motor 11 is connected with a ball screw 14 through a coupling 16 by key connection (a bolt 17 and a nut 18 are matched with the coupling to realize positioning and installation with other components). The nut sleeve 15 is connected with the variable push rod 21, the variable push rod 21 is connected with the swash plate push rod 5 through the bolt 13, the swash plate push rod 5 is connected with the variable swash plate 4 through the bolt group 2, the nut sleeve 15 is matched with a matched limiting device (such as a slide rail and a guide rod) in the sliding process for use, namely, the servo motor 11 drives the screw rod to rotate so as to drive the nut sleeve to do linear reciprocating motion, the nut sleeve 15 drives the variable push rod 21 to move so as to push the swash plate push rod 5 to move, and finally the variable swash plate is driven to realize rotation.

In this embodiment, one end of each of the two swash plate push rods is hinged to each of the two variable swash plates, the other end of each of the two swash plate push rods is hinged to an end of each of the variable push rods, and the two swash plate push rods are symmetrically arranged with respect to the plunger plate 9. The variable push rod is "n" style of calligraphy structure, and variable push rod one end is connected the setting with the nut cover, and the other end realizes articulatedly with two sloping cam plate push rods, and sloping cam plate push rod tip is provided with articulated journal stirrup, is convenient for fix a position the installation with the variable sloping cam plate, and overall structure is simple, simple to operate, and control is accurate.

In this embodiment, the two variable swash plates are connected at the bottom to form a return spring 22. The reset springs are arranged at the bottoms of the two variable swash plates and used for achieving the reset function of the variable swash plates, and when the variable swash plates need to return after deflection, the use requirements can be met through the reset springs.

In this embodiment, the float cup pump mechanism includes a port plate 6 attached to the variable swash plate 4, a roller plate 7 disposed coaxially with the port plate 6, and a float cup assembly disposed between the roller plate 7 and the plunger plate 9. The valve plate 6 is fixedly arranged on the variable swash plate 4, the roller plate 7 is arranged on the variable swash plate 6 and used for realizing the positioning and installation of the floating cups, and meanwhile, the floating cup assembly plays a role of a protective part, and is symmetrically arranged between the two variable swash plates and the plunger plate 9 relative to the plunger plate 9, so that the floating cup assembly is more balanced in stress in the working process.

In this embodiment, the float cup assembly includes a plurality of float cups 8 uniformly arranged in the circumferential direction of the drum plate and a plurality of plungers 10 uniformly arranged in the circumferential direction of a plunger disc 9; the plungers are arranged in one-to-one correspondence with the floating cups. A plurality of mounting points are arranged on the roller plate along the circumferential direction, the floating cups 8 are uniformly arranged on the mounting points at intervals, a plurality of mounting positions for mounting the plungers 10 are correspondingly arranged on the plunger disc 9, the plungers 10 are fixedly arranged on the plunger disc at uniform intervals, and the whole structure is convenient to install.

In this embodiment, the float cup 8 is sleeved on the plunger 10 and the float cup can relatively deflect in the axial direction relative to the plunger. The plungers 10 are arranged in the floating cups 8, the floating cups 8 can rotate relative to the plungers, and the floating cups and the plungers are the same in number, namely the floating cups and the plungers are arranged in a one-to-one correspondence mode.

In this embodiment, the two floating cup mechanisms are symmetrically arranged relative to the plunger disc. Two sets of cup mechanisms of floating are for 9 symmetrical arrangement of plunger dish, adopt the key-type connection between transmission shaft and the plunger dish, and overall structure is simple, the operation of being convenient for.

In this embodiment, an elastic pressing sheet 12 for limiting the position of the float cup is disposed between the plunger disc 9 and the roller plate 7. The elastic pressing sheet 12 is used for pressing each floating cup to ensure that the floating cup is not displaced in the using process.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. The utility model provides a variable system of floating cup formula axial plunger pump which characterized in that: the variable swash plate type variable swash plate pump comprises a transmission shaft, a plunger plate arranged on the transmission shaft in an externally sleeved mode, two variable swash plates arranged on the transmission shaft in an externally sleeved mode and arranged on two sides of the plunger plate respectively, and a floating cup pump mechanism arranged between the variable swash plates and the plunger plate; and a deflection mechanism for driving the two variable swash plates to rotate relatively is arranged between the two variable swash plates.

2. The variable displacement system of a floating-cup axial piston pump as set forth in claim 1, wherein: the deflection mechanism comprises a driving motor, a ball screw nut pair connected with the output end of the driving motor, a variable push rod connected with a nut sleeve of the ball screw nut pair, and two swash plate push rods.

3. The variable displacement system of a floating-cup axial piston pump as set forth in claim 2, wherein: one ends of the two swash plate push rods are hinged with the two variable swash plates respectively, the other ends of the two swash plate push rods are hinged to the end parts of the variable push rods, and the two swash plate push rods are symmetrically arranged relative to the plunger plate.

4. The variable displacement system of a floating-cup axial piston pump as set forth in claim 1, wherein: and the bottoms of the two variable swash plates are connected and provided with return springs.

5. The variable displacement system of a floating-cup axial piston pump as set forth in claim 1, wherein: the floating cup pump mechanism comprises a valve plate, a roller plate and a floating cup assembly, wherein the valve plate is attached to the variable swash plate, the roller plate and the valve plate are coaxially arranged, and the floating cup assembly is arranged between the roller plate and the plunger plate.

6. The variable displacement system of a floating-cup axial piston pump as set forth in claim 5, wherein: the floating cup assembly comprises a plurality of floating cups uniformly arranged along the circumferential direction of the roller plate and a plurality of plungers uniformly arranged along the circumferential direction of the plunger disc; the plungers are arranged in one-to-one correspondence with the floating cups.

7. The variable displacement system of a floating-cup axial piston pump as set forth in claim 6, wherein: the floating cup is sleeved on the plunger and can deflect relative to the plunger along the axial direction.

8. The variable displacement system of a floating-cup axial piston pump as set forth in claim 7, wherein: the floating cup mechanisms are two and are symmetrically arranged relative to the plunger disc.

9. The variable displacement system of a floating-cup axial piston pump as set forth in claim 8, wherein: and an elastic pressing sheet for limiting the floating cup is arranged between the plunger disc and the roller plate.