CN110725783A - Plunger pump and plunger piston shoe assembly thereof - Google Patents
Plunger pump and plunger piston shoe assembly thereof Download PDFInfo
- Publication number
- CN110725783A CN110725783A CN201911077086.7A CN201911077086A CN110725783A CN 110725783 A CN110725783 A CN 110725783A CN 201911077086 A CN201911077086 A CN 201911077086A CN 110725783 A CN110725783 A CN 110725783A
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- China
- Prior art keywords
- plunger
- face
- plunger rod
- shoe assembly
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
- F04B1/124—Pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
- F04B1/124—Pistons
- F04B1/126—Piston shoe retaining means
Abstract
The invention discloses a plunger pump and a plunger piston shoe assembly thereof, wherein the plunger piston shoe assembly comprises a piston shoe for being attached to a swash plate and a plunger piston with a cylindrical cavity inside, the piston shoe is provided with an inwards concave spherical structure, the plunger piston comprises a plunger rod and a ball head which is arranged at the end part of the plunger rod and forms a spherical kinematic pair with the spherical structure, the ball head is provided with a ball head end surface which is perpendicular to the axial direction of the plunger rod and faces the piston shoe, the plunger rod is provided with a plunger rod end surface which is distributed oppositely to the ball head end surface, and the outer circle diameters and the areas of the ball head end surface and the plunger. According to the plunger piston assembly, the area of the ball end face of the plunger is equal to the area of the end face of the plunger rod, so that the resultant force of high pressure at two ends of the plunger is small and relatively stable, the abrasion problem of the plunger and the piston shoes is solved, and the service life of the plunger piston shoe assembly is prolonged.
Description
Technical Field
The invention relates to the technical field of plunger pump design, in particular to a plunger piston shoe assembly. In addition, the invention also relates to a plunger pump comprising the plunger piston shoe assembly.
Background
The plunger piston shoe assembly serves as a core component of the plunger pump, and plays a crucial role in the flow distribution process of the plunger pump. The plunger shoe assembly has been developed because it has a simple structure, is spherical and cylindrical in basic shape, is easy to process, and can achieve high precision.
In the prior art, a plunger piston shoe assembly generally includes a plunger piston and a piston shoe, the plunger piston is provided with a cylindrical cavity penetrating through the plunger piston in the axial direction, the end of the plunger piston adopts a local spherical surface structure, the piston shoe adopts a concave conical surface structure, and in an assembly state, the local spherical surface structure and the conical surface structure form a linear seal. The fluid pressure acting on the plunger consists mainly of two parts, one part acting on the part spherical structure and the other part acting on the end face of the trailing end of the plunger. During operation, the pressure of the fluid on both ends of the plunger is consistent only when the plunger and the sliding shoe are at a certain angle.
However, in the variable displacement plunger pump, when the angle of the swash plate changes, the angle between the plunger and the slipper changes, and the component force of the ball end of the plunger in the axial direction of the plunger changes, so that the high pressure at the two ends of the plunger cannot be offset, the bearing value of the plunger and the slipper is increased, the abrasion of the plunger and the slipper is aggravated, and the service life of the plunger and slipper assembly is shortened.
In summary, how to reduce the wear between the plunger and the slipper when the angle between the plunger and the slipper changes, so as to prolong the service life of the plunger slipper assembly, is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a plunger and slipper assembly, which has less wear between the plunger and the slipper and longer service life. It is another object of the present invention to provide a plunger pump including the above plunger shoe assembly.
In order to achieve the above purpose, the invention provides the following technical scheme:
the plunger piston shoe assembly comprises a piston shoe which is attached to a swash plate and a plunger with a cylindrical cavity inside, wherein the piston shoe is provided with an inwards concave spherical structure, the plunger comprises a plunger rod and a ball head which is arranged at the end of the plunger rod and forms a spherical kinematic pair with the spherical structure, the ball head is provided with a ball head end face which is perpendicular to the axial direction of the plunger rod and faces the piston shoe, the plunger rod is provided with a plunger rod end face which is distributed oppositely to the ball head end face, and the ball head end face is equal to the excircle diameter of the plunger rod end face and is equal to the excircle diameter of the plunger rod end face.
Preferably, a return spring is arranged in the columnar cavity, the columnar cavity is provided with a step surface back to the end surface of the ball head, and the end part of the return spring is connected with the step surface.
Preferably, the end part of the plunger rod, which is far away from the ball head, is provided with a tail end face, the area of the end face of the plunger rod is equal to the sum of the areas of the tail end face and the step face, and the excircle diameter of the tail end face is equal to the excircle diameter of the ball head end face.
Preferably, the end face of the tail end, the step face and the end face of the ball head are distributed in parallel.
Preferably, a through hole for communicating the oil hole of the swash plate with the cylindrical cavity is formed in the center of the spherical structure.
A plunger pump comprising any one of the plunger shoe assemblies described above.
The plunger piston shoe assembly provided by the invention comprises a piston shoe and a plunger, wherein a spherical head of the plunger and a spherical surface structure of the piston shoe form a spherical kinematic pair, the spherical head is provided with a spherical head end face, a plunger rod of the plunger is provided with a plunger rod end face which is distributed opposite to the spherical head end face, the diameters of the outer circles of the spherical head end face and the plunger rod end face are equal, and the areas of the spherical head end face and the plunger rod end face are equal.
In the working process, high-pressure oil acts on the end face of the ball head of the plunger and the end face of the plunger rod, and the area of the end face of the ball head of the plunger is equal to that of the end face of the plunger rod, so that the resultant force of high pressure at two ends of the plunger is small and relatively stable, the abrasion problem of the plunger and the sliding shoe is solved, and the service life of the plunger and sliding shoe assembly is prolonged.
The application also provides a plunger pump with the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a cross-sectional view of a plunger shoe assembly;
FIG. 2 is a schematic structural view of a plunger shoe assembly;
FIG. 3 is a schematic view of the plunger;
fig. 4 is a schematic structural view of the slipper.
The reference numerals in FIGS. 1-4 are:
plunger 1, plunger rod 11, bulb 12, piston shoe 2, return spring 3, swash plate 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a plunger piston shoe assembly, which can realize that the resultant force of high pressure at two ends of a plunger is small and relatively stable when the angles of the plunger and the piston shoe are changed, reduce the friction between the plunger and the piston shoe and have the advantage of long service life. Another core of the present invention is to provide a plunger pump comprising the above plunger shoe assembly.
Referring to fig. 1-4, fig. 1 is a cross-sectional view of a plunger shoe assembly, wherein d is the diameter of a cylindrical cavity; FIG. 2 is a schematic structural view of a plunger shoe assembly; FIG. 3 is a schematic view of the plunger; fig. 4 is a schematic structural view of the slipper.
The application provides a plunger piston shoe subassembly, including be used for 2, the inside plunger 1 that has the column cavity of piston shoe 2, the inside laminating with sloping cam plate 4, piston shoe 2 is equipped with the spherical surface structure of indent, plunger 1 includes plunger rod 11, locates the postThe end of the plunger rod 11 and the spherical structure form a ball head 12 of a spherical kinematic pair, the ball head 12 is provided with a ball head end surface which is perpendicular to the axial direction of the plunger rod 11 and faces the sliding shoe 2, the plunger rod 11 is provided with a plunger rod end surface which is distributed opposite to the ball head end surface, and the excircle diameter d of the plunger rod end surface1Diameter d of outer circle of end face of ball head2The area of the end surface of the plunger rod is equal to that of the end surface of the ball head.
Specifically, the slipper 2 is a hollow structure, wherein the hollow structure is an envelope surface of a spherical surface. The ball head 12 of the plunger 1 is placed in the envelope surface of the slipper 2 and forms a spherical kinematic pair relationship therewith. The plunger 1 is a hollow structure with a cylindrical cavity inside, the cylindrical cavity penetrates through the plunger 1 along the axial direction of the plunger 1, and oil flows into and out of the valve plate when the plunger pump is used for oil distribution. In order to allow the oil hole of the swash plate 4 to communicate with the cylindrical cavity of the plunger 1, a through hole is required to be provided in the shoe 2, and preferably the through hole is located at the center of the spherical structure.
The end face of the plunger rod refers to a projection which is back to the ball head 12 and is obtained along the axial direction of the plunger rod 11, the area of the end face of the plunger rod and the diameter d of the excircle of the end face of the plunger rod1Respectively, the area and diameter of the projection. In addition, the end surface of the plunger rod can be a single plane or can comprise more than two planes.
When the valve plate on the sliding shoe side rotates, the plunger 1 moves axially to distribute oil, so that oil absorption and oil pressing of the plunger pump are realized. When the flow distribution is carried out, high-pressure oil acts on the ball end surface of the plunger 1 and the end surface of the plunger rod due to the excircle diameter d of the end surface of the plunger rod1Excircle diameter d approximately equal to ball head end face2Oil pressure p of plunger rod end face1Oil pressure p approximately equal to ball end face2The oil pressure loss is ignored, and the area of the end face of the ball head is approximately equal to that of the end face of the plunger rod. Therefore, even if the angles of the plunger 1 and the piston shoe 2 are changed, the high pressures at the two ends of the plunger 1 can be mutually offset, the resultant force on the plunger 1 is still small and kept relatively stable, and the friction between the plunger 1 and the piston shoe 2 is almost zero, so that the stress problem of the piston shoe 2 and the plunger 1 in the relative movement process is solved, and the service life of the plunger piston shoe assembly is prolonged.
It should be noted that, in an ideal case, the outer diameters of the ball end surface and the plunger rod end surface are equal, the areas thereof are equal, and the oil pressures thereof are equal, but in consideration of factors such as machining precision and oil pressure loss, after the plunger shoe assembly is put into use, various parameters of the ball end surface and the plunger rod end surface are basically kept consistent, and a certain deviation is allowed to float in a small range.
Optionally, in an embodiment provided by the present application, a return spring 3 is disposed in the cylindrical cavity, a step surface facing away from the end surface of the ball head is disposed on an inner side wall of the plunger rod 11, and an end of the return spring 3 is attached to the step surface. Specifically, the return spring 3 is placed in a cylindrical cavity of the plunger 1, the cylindrical cavity is of a stepped structure, the end of the return spring 3 is connected with or abutted against a step surface of the cylindrical cavity, and the return spring 3 controls the plunger 1 to axially reset by utilizing the elastic restoring force of the return spring 3.
It will be appreciated that when only the step surface for limiting the position of the return spring 3 is provided in the cylindrical cavity of the plunger rod 11, and no other step surface is provided, the area of the end surface of the plunger rod is equal to the sum of the area of the end surface and the step surface, and the diameter of the end surface is equal to the diameter d of the ball end surface2Wherein, the end surface of the end refers to the end surface of the plunger rod 11 far away from the end of the ball head 12. When in design, the end face of the tail end, the step face and the end face of the ball head are distributed in parallel.
In addition to the plunger shoe assembly, the invention also provides a plunger pump comprising any one of the plunger shoe assemblies, wherein the abrasion between the plunger 1 and the shoe 2 of the plunger pump is small, and the service life of the plunger pump is long. The structure of other parts of the plunger pump is referred to the prior art, and is not described herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The plunger pump and the plunger shoe assembly thereof provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a plunger piston boots subassembly, includes piston boots (2) that are used for with sloping cam plate (4) laminating, inside has plunger (1) of column cavity, its characterized in that, piston boots (2) are equipped with the spherical surface structure of indent, plunger (1) include plunger rod (11), locate the tip of plunger rod (11) and with spherical surface structure forms bulb (12) of spherical kinematic pair, bulb (12) are equipped with the perpendicular to axial of plunger rod (11), and towards the bulb terminal surface of piston boots (2), plunger rod (11) have with the relative plunger rod terminal surface that distributes of bulb terminal surface, the bulb terminal surface with the excircle diameter of plunger rod terminal surface equals, and the area equals.
2. Plunger shoe assembly according to claim 1, characterized in that a return spring (3) is arranged in the cylindrical cavity, that the cylindrical cavity is provided with a step surface facing away from the ball end surface, and that the end of the return spring (3) is connected with the step surface.
3. Plunger shoe assembly according to claim 2, characterized in that the end of the plunger rod (11) remote from the ball head (12) has a terminal end face with an area equal to the sum of the areas of the terminal end face and the step face, the outer circular diameter of the terminal end face being equal to the outer circular diameter of the ball head end face.
4. The plunger shoe assembly of claim 3 wherein said tip end face, said step face, and said ball end face run parallel.
5. Plunger shoe assembly according to claim 4, characterized in that the centre of the spherical structure is provided with a through hole for communicating the oil bore of the swash plate (4) with the cylindrical cavity.
6. A plunger pump comprising a plunger shoe assembly according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911077086.7A CN110725783B (en) | 2019-11-06 | 2019-11-06 | Plunger pump and plunger piston shoe assembly thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911077086.7A CN110725783B (en) | 2019-11-06 | 2019-11-06 | Plunger pump and plunger piston shoe assembly thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110725783A true CN110725783A (en) | 2020-01-24 |
| CN110725783B CN110725783B (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911077086.7A Active CN110725783B (en) | 2019-11-06 | 2019-11-06 | Plunger pump and plunger piston shoe assembly thereof |
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| Country | Link |
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| CN (1) | CN110725783B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2527744Y (en) * | 2001-12-20 | 2002-12-25 | 华中科技大学 | Plunger-piston shoes assembly |
| CN102606378A (en) * | 2012-03-21 | 2012-07-25 | 北京工业大学 | Full water lubrication pass shaft type water hydraulic piston motor |
| CN102734109A (en) * | 2012-05-29 | 2012-10-17 | 武汉华喜特种液压设备有限公司 | Fully water-lubricated valve distribution plunger pump |
| CN203239555U (en) * | 2013-05-24 | 2013-10-16 | 宁波市鄞州华康工程液压件厂(普通合伙) | Plunger sliding shoe component |
| CN104074738A (en) * | 2014-06-30 | 2014-10-01 | 徐州徐工液压件有限公司 | Plunger pump and plunger motor and closing-in-prevention forward-packet plunger sliding boot assembly thereof |
| CN109236597A (en) * | 2018-11-08 | 2019-01-18 | 四川航天烽火伺服控制技术有限公司 | A kind of piston shoes plunger assembly and a kind of plunger pump |
-
2019
- 2019-11-06 CN CN201911077086.7A patent/CN110725783B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2527744Y (en) * | 2001-12-20 | 2002-12-25 | 华中科技大学 | Plunger-piston shoes assembly |
| CN102606378A (en) * | 2012-03-21 | 2012-07-25 | 北京工业大学 | Full water lubrication pass shaft type water hydraulic piston motor |
| CN102734109A (en) * | 2012-05-29 | 2012-10-17 | 武汉华喜特种液压设备有限公司 | Fully water-lubricated valve distribution plunger pump |
| CN203239555U (en) * | 2013-05-24 | 2013-10-16 | 宁波市鄞州华康工程液压件厂(普通合伙) | Plunger sliding shoe component |
| CN104074738A (en) * | 2014-06-30 | 2014-10-01 | 徐州徐工液压件有限公司 | Plunger pump and plunger motor and closing-in-prevention forward-packet plunger sliding boot assembly thereof |
| CN109236597A (en) * | 2018-11-08 | 2019-01-18 | 四川航天烽火伺服控制技术有限公司 | A kind of piston shoes plunger assembly and a kind of plunger pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110725783B (en) | 2022-04-12 |
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