CN219366249U - Cylinder body for plunger pump, plunger pump and engineering machinery - Google Patents
Cylinder body for plunger pump, plunger pump and engineering machinery Download PDFInfo
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- CN219366249U CN219366249U CN202320077150.7U CN202320077150U CN219366249U CN 219366249 U CN219366249 U CN 219366249U CN 202320077150 U CN202320077150 U CN 202320077150U CN 219366249 U CN219366249 U CN 219366249U
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- plunger
- hole
- plunger pump
- cylinder
- cylinder body
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Abstract
The utility model relates to a cylinder body for a plunger pump, the plunger pump and engineering machinery, belongs to the technical field of hydraulic pumps, and solves the problem that the existing plunger pump generates a crushing phenomenon when working.
Description
Technical Field
The utility model relates to the technical field of hydraulic pumps, in particular to a cylinder body for a plunger pump, the plunger pump and engineering machinery.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the prior plunger pump technology, as shown in fig. 1, a plunger hole of a cylinder body of the plunger pump is cylindrical, the plunger is also in a cylindrical structure, the plunger is in clearance fit with the plunger hole of the cylinder body, when the plunger pump works, the plunger receives torque in the radial direction in the reciprocating motion process, and a component force F generated by the torque in the radial direction of the plunger RK The plunger can incline, the point contact position of the plunger and the cylinder body is positioned at the edge position of the plunger hole of the cylinder body, and the structure of the contact position is relatively sharp because the edge position is approximately 90 degrees, so that relatively large stress is easily generated at the contact position of the cylinder body and the plunger, the edge position of the plunger hole of the cylinder body is crushed, a crushing point is formed, and the service life of the plunger pump is seriously influenced.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides the cylinder body for the hydraulic pump, so that the crushing phenomenon of the cylinder body caused by the inclination of the plunger is avoided, and the service life of the hydraulic pump is prolonged.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
in a first aspect, an embodiment of the present utility model provides a cylinder for a plunger pump, having a plunger hole inside, and including a first hole portion and a second hole portion that are sequentially disposed along a direction from a liquid outlet end of the plunger hole to an extension end of the plunger, where the first hole portion is a cylindrical structure, the second hole portion is a diverging hole structure, and a hole surface of the second hole portion is an arc surface that is curved toward a center line direction of the plunger hole.
Optionally, the ratio of the length of the second hole portion along the axial direction of the plunger hole to the total length of the plunger hole is 1/5.5-1/4.5.
Optionally, the diameter of the end part of the second hole part with smaller area is equal to that of the first hole part, and the diameter of the end part with larger area is 1.1-1.2 times that of the first hole part.
Optionally, the cylinder for the plunger pump is provided with a plurality of plunger holes.
Optionally, the plurality of plunger holes are distributed at equal intervals along a circumferential direction of a set circumference, and the set circumference is coaxially arranged with the cylinder body for the plunger pump.
Optionally, a drive shaft mounting hole is formed in the center of the cylinder body for the plunger pump.
In a second aspect, an embodiment of the present utility model provides a plunger pump, including a plunger and the cylinder for a plunger pump according to the first aspect, where the plunger is in clearance fit with the plunger hole.
Optionally, the end that the plunger stretches out to the outside of cylinder body for the plunger pump is connected with the eccentric position of sloping cam plate through the skid shoe, and the sloping cam plate is fixed to be set up, and the cylinder body for the plunger pump is connected with actuating mechanism, skid shoe and sloping cam plate sliding connection, and the end of plunger is provided with the bulb, and the bulb embedding is in the spherical groove that the skid shoe set up and with spherical groove sliding connection.
Optionally, a valve plate is arranged at the liquid outlet end of the cylinder body for the plunger pump.
In a third aspect, the present utility model provides an engineering machine provided with the plunger pump according to the second aspect.
The beneficial effects of the utility model are as follows:
according to the cylinder body for the plunger pump, the first hole part and the second hole part are arranged, and the hole surface of the second hole part is an arc surface bent towards the central line direction of the plunger hole, so that the contact position of the plunger when the plunger is inclined is an arc surface, the sharpness of the contact position is greatly reduced, the cylinder body cannot generate larger stress at the contact position, the crushing phenomenon of the cylinder body is avoided, and the service lives of the cylinder body and the whole plunger pump are prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not limit the application.
FIG. 1 is a schematic diagram of a crushing point generated between a plunger and a cylinder in a conventional plunger pump;
FIG. 2 is a schematic view showing the structure of a cylinder for a plunger pump according to embodiment 1 of the present utility model;
FIG. 3 is a schematic view showing the structure of a plunger hole according to embodiment 1 of the present utility model;
FIG. 4 is a schematic diagram showing the assembly of a cylinder, a plunger, and a swash plate for a plunger pump according to embodiment 2 of the present utility model;
the piston pump comprises a cylinder body, a piston hole, a first hole part, a second hole part, an arc-shaped surface, a piston, a liquid flow passage, a driving shaft mounting hole, a swash plate and a sliding shoe.
Detailed Description
In this embodiment, the plunger pump is an axial plunger pump, and is used for providing a hydraulic motor of an engineering machine with a liquid with a set pressure, and its cylinder body rotates along with the driving shaft, and cooperates with the plunger in the plunger hole of the cylinder body to form a variable volume in the plunger hole, and the liquid outlet end of the cylinder body cooperates with the valve plate to repeatedly suck and discharge the liquid, and the plunger is a cylinder reciprocating in the plunger hole of the cylinder body, so as to realize the suction and discharge of the liquid.
Example 1
The embodiment provides a cylinder body 1 for a plunger pump, as shown in fig. 2-3, the structure of the end portion of a plunger hole 2, which is used for extending a plunger 3, is improved, so that the plunger hole 2 in the cylinder body is in a direction from a liquid outlet end to the plunger extending end, and comprises a first hole portion 2-1 and a second hole portion 2-2 which are sequentially arranged, wherein the first hole portion 2-1 and the second hole portion 2-2 are coaxially arranged, one end of the first hole portion 2-1 extends to the liquid outlet end of the plunger hole 2, the other end of the first hole portion 2-1 is communicated with one end of the second hole portion 2-2, the other end of the second hole portion 2-2 extends to the plunger extending end of the plunger hole 2, the structure of the first hole portion 2-1 is the same as that of a traditional plunger hole 2, the second hole portion 2-2 is formed by grinding from the end portion, namely, the cross section size of the second hole portion is gradually increased along the direction from the liquid outlet end of the plunger hole to the plunger extending end, and the hole surface of the second hole portion is in an arc-shaped center line 2-3 which faces towards one side of the plunger hole.
The plunger hole of the traditional cylinder body is of a cylindrical structure as a whole, and when the plunger rotates around the center line of the cylinder body under the action of the cylinder body, as the plunger and the plunger hole are in clearance fit, the component force F of the torque of the cylinder body to the plunger along the radial direction of the plunger is generated RK The plunger can incline, at the moment, the bottom end of the plunger contacts with the edge of the extending end of the plunger hole, and as the plunger hole surfaces at the two sides of the edge are approximately 90 degrees with the end face of the cylinder body and are of a sharper structure, larger stress is easy to be generated at the position of the cylinder body at the edge of the plunger hole, and the crushing phenomenon of the cylinder body at the position is caused.
According to the cylinder body for the plunger pump, the second hole part 2-2 of the gradually-reaming structure is arranged, and the hole surface of the second hole part 2-2 is the arc surface 2-3 bent towards one side direction of the center line of the plunger hole, so that the contact position of the plunger 3 with the cylinder body is the arc surface when the plunger 3 is inclined, and compared with the traditional contact position which is of a sharp structure, the cylinder body is not easy to generate stress concentration, the crushing phenomenon of the cylinder body is avoided, and the service lives of the whole cylinder body and the plunger pump are prolonged.
In this embodiment, in order to ensure that the contact position with the cylinder body 1 for the plunger pump is an arc surface of the second hole portion 2-2 when the plunger 3 is inclined, the length of the second hole portion 2-2 along the axial direction of the plunger hole 2 is 1/5.5-1/4.5 of the total length of the plunger hole 2, preferably, the length of the second hole portion 2-2 along the axial direction of the plunger hole 2 is 1/5 of the total length of the plunger hole, so that the contact position between the plunger 3 and the port side of the plunger hole 2 of the cylinder body 1 for the plunger pump is located on the arc surface 2-3 instead of the end outer side edge during the reciprocating movement of the plunger 3, thereby avoiding crushing.
In this embodiment, the cross-sectional dimension of the end portion of the second hole portion 2-2 with smaller area is equal to the cross-sectional dimension of the first hole portion 2-1, and the cross-sectional dimension of the end portion of the second hole portion 2-2 with larger area is 1.1-1.2 times, preferably 1.1 times, of the cross-sectional area of the first hole portion 2-1.
The cylinder body for the plunger pump of the embodiment only carries out structural improvement on the plunger extending end of the plunger hole 2, and other structures adopt the structure of the cylinder body for the existing plunger pump.
The cylinder body is provided with a plurality of plunger holes 2, the number of the plunger holes 2 is 8-10, preferably 9, the plunger holes 2 are distributed at equal intervals along the circumferential direction of a set circumference, the set circumference and the cylinder body 1 for the plunger pump are coaxially arranged, namely, the center line of the circumference and the center line of the cylinder body 1 for the plunger pump are in the same straight line.
One end of the plunger hole 1 extends to one end face of the plunger pump cylinder 1, and the other end of the plunger hole is communicated with a liquid flow passage 4 formed in the plunger pump cylinder 1 as a plunger extending end, and is used for extruding and flowing out or sucking liquid entering the plunger hole through the plunger 3.
The center position of the cylinder body 1 for the plunger pump is provided with a driving shaft mounting hole 5 which is coaxially arranged with the driving shaft mounting hole, the driving shaft mounting hole adopts a stepped hole, a part of the hole section of the driving shaft is provided with a spline groove, and the driving shaft can drive the spline groove of the driving shaft mounting hole to be fixedly connected with the cylinder body, so that the cylinder body is driven to rotate around the axis of the cylinder body.
Other structures of the cylinder body are required to be conventional structures, and detailed description thereof is omitted herein.
Example 2
The present embodiment provides a plunger pump, as shown in fig. 4, provided with the cylinder 1 for a plunger pump described in embodiment 1, and other structures of the plunger pump may be adopted in the prior art.
The plunger pump of this embodiment adopts sloping cam type axial plunger pump, all is equipped with plunger 3 in the plunger hole 2 of plunger pump cylinder body 1, and plunger 3 is cylindrical structure, and plunger 3 and plunger hole 2 clearance fit, plunger 3 stretch out the end through the plunger of plunger hole 2 and stretch out to the cylinder body outside and connect the eccentric position of sloping cam plate 6.
The swash plate 6 is fixed with the housing of the plunger pump such that the swash plate 6 is fixedly disposed.
The disc surface of the swash plate 6 is disposed at a set acute angle to the center line of the plunger pump cylinder 1, and the end of the plunger 3 extending outside the plunger pump cylinder 1 is connected to the swash plate 6 via a shoe 7.
In this embodiment, the end of the plunger 3 extending to the outside of the cylinder 1 for the plunger pump is provided with a ball head, the sliding shoe 7 is provided with a first part with a smaller diameter and a second part with a larger diameter, wherein the first part is provided with a spherical groove matched with the ball head, and the ball head is embedded into the spherical groove and is in sliding connection with the groove surface of the spherical groove, so that the universal connection between the plunger and the sliding shoe is realized.
The second part is jointed with the disc surface of the swash plate 6 through a plane and is connected with the swash plate 6 in a sliding way.
The middle part of cylinder body for the plunger pump is passed there is the drive shaft, and drive shaft liquid passes sloping cam plate 6 through the through-hole in sloping cam plate middle part, and the drive shaft passes through the spline groove of drive shaft mounting hole and cylinder body 1 fixed connection for the plunger pump, and the drive shaft is not connected with sloping cam plate 6, and the drive shaft is used for being connected with the engine, can be with the output power transmission of engine to the cylinder body, drives the cylinder body and rotates around self axis.
The plunger pump is characterized in that a return disc is further arranged between the cylinder body 1 and the swash plate 6, the return disc is arranged in parallel with the swash plate surface of the swash plate, a plurality of through holes are formed in the return disc, the diameter of each through hole is larger than the outer diameter of the first part of the sliding shoe and smaller than the outer diameter of the second part of the sliding shoe, the first part of the sliding shoe penetrates through the return disc through the through holes, the center of the return disc penetrates through a driving shaft and is fixed with the driving shaft, the return disc can synchronously rotate with the cylinder body, and the return disc is used for driving the plunger to move towards the swash plate direction, so that liquid in a plunger groove is sucked.
The end face of the liquid outlet end of the cylinder body 1 for the plunger pump is also provided with a valve plate in a matched mode, and the valve plate and the cylinder body are connected in the prior art.
In this embodiment, the cylinder body rotates about its own axis under the action of the drive shaft, so that the plunger reciprocates in the plunger hole under the action of the swash plate and the return plate, thereby achieving suction and discharge of liquid.
Other structures of the plunger pump are known in the art and will not be described in detail herein.
Example 3
The present embodiment provides a construction machine provided with the plunger pump described in embodiment 2, and the construction machine is a construction machine provided with the plunger pump, such as an excavator, and other construction machines may be constructed by using the conventional technology, and will not be described in detail herein.
While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.
Claims (10)
1. The utility model provides a cylinder body for plunger pump, inside has plunger hole, its characterized in that, along plunger hole liquid end to plunger extension end direction, the plunger hole is including first hole portion and the second hole portion that sets gradually, and first hole portion is cylindrical structure, and the second hole portion is the hole structure of expanding gradually, and the hole surface of second hole portion is the curved arcwall face of orientation plunger hole central line direction.
2. A cylinder for a plunger pump according to claim 1, wherein the ratio of the length of the second hole portion in the axial direction of the plunger hole to the total length of the plunger hole is 1/5.5 to 1/4.5.
3. A cylinder for a plunger pump according to claim 1, wherein the diameter of the smaller end of the second hole is equal to the diameter of the first hole, and the diameter of the larger end is 1.1 to 1.2 times the diameter of the first hole.
4. A cylinder for a plunger pump according to claim 1, wherein the cylinder for a plunger pump is provided with a plurality of plunger holes.
5. A cylinder for a plunger pump according to claim 1, wherein the plurality of plunger holes are equally spaced circumferentially around a set circumference, and the set circumference is disposed coaxially with the cylinder for a plunger pump.
6. A cylinder for a plunger pump as set forth in claim 1, wherein a drive shaft mounting hole is provided at the center thereof.
7. A plunger pump comprising a plunger and the cylinder for a plunger pump according to any one of claims 1 to 6, wherein the plunger is in clearance fit with the plunger hole.
8. The plunger pump according to claim 7, wherein the end portion of the plunger extending to the outside of the cylinder body for the plunger pump is connected to the eccentric position of the swash plate by a shoe, the swash plate is fixedly provided, the cylinder body for the plunger pump is connected to the driving mechanism, the shoe is slidably connected to the swash plate, the end portion of the plunger is provided with a ball head, and the ball head is inserted into a ball groove provided in the shoe and slidably connected to the ball groove.
9. The plunger pump according to claim 7, wherein the liquid outlet end of the cylinder for the plunger pump is provided with a valve plate.
10. A construction machine provided with the plunger pump according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320077150.7U CN219366249U (en) | 2023-01-09 | 2023-01-09 | Cylinder body for plunger pump, plunger pump and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320077150.7U CN219366249U (en) | 2023-01-09 | 2023-01-09 | Cylinder body for plunger pump, plunger pump and engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219366249U true CN219366249U (en) | 2023-07-18 |
Family
ID=87117976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320077150.7U Active CN219366249U (en) | 2023-01-09 | 2023-01-09 | Cylinder body for plunger pump, plunger pump and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219366249U (en) |
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2023
- 2023-01-09 CN CN202320077150.7U patent/CN219366249U/en active Active
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