Novel hollow plunger device

Abstract

A novel hollow plunger device comprises a hollow plunger, a plunger plug is arranged in a hollow cavity of the plunger, the plunger plug is connected with the hollow cavity of the plunger through threads, throttling holes are formed in a center shaft of the plunger and a center shaft of the plunger plug, and after the plunger plug is installed in the hollow cavity of the plunger, the throttling holes are connected with the plunger plug through threads. And the throttling hole of the plunger is communicated with the throttling hole of the plunger plug. According to the novel hollow plunger device, the plunger plug is arranged in the plunger through the threads, so that the assembly difficulty is simplified, and the operation is convenient; grooves are formed in the plunger and the plug, so that the overall weight is reduced conveniently; the plunger plug is a double-end plug with a throttling hole, the rotation inertia of the plunger can be reduced, pulsation and impact of the plunger pump can be reduced, then the volume efficiency of the pump and the dynamic response speed of the pump are improved, the pressure impact of the plunger pump is reduced, and the service life of the plunger pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a novel hollow plunger device. Background Art

[0002] An axial piston pump is a reciprocating positive-displacement pump, which is a hydraulic pump that sucks and discharges liquid through the periodic reciprocating movement of the plunger in the cylinder bore of the pump body. The development of piston pumps in China started earlier. In the 1960s, the research and production of axial piston pumps began. However, compared with foreign benchmark products, there are the following problems in axial piston pumps in China: low reliability, short service life, low efficiency, slow dynamic response speed, etc. Among them, the large pressure shock and large leakage caused by the unreasonable plunger structure design are the main reasons for the low reliability, short service life, low efficiency and slow dynamic response of the piston pump.

[0003] In the prior art, the hollow plunger of an axial piston pump usually welds two plunger rods together through a welding process, with a support block in the middle. The welded integral plunger rod has a through hole communicating in the middle. However, this kind of plunger has a complex structure, high processing difficulty, high cost and low yield, seriously affecting the service life and reliability of the piston pump. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the above-mentioned deficiencies of the prior art and provide a novel hollow plunger device with a simple structure and good effect.

[0005] The utility model is realized by the following technical scheme: a novel hollow plunger device, including a hollow plunger, a plunger plug is arranged in the hollow cavity of the plunger, the plunger plug is connected with the hollow cavity of the plunger through a thread, throttle holes are arranged on the central axes of both the plunger and the plunger plug. After the plunger plug is installed into the hollow cavity of the plunger, the throttle hole of the plunger communicates with the throttle hole of the plunger plug.

[0006] Furthermore: the hollow cavity of the plunger is cylindrical, the outer circle of the plunger plug is provided with an external thread, and the inner wall of the hollow cavity of the plunger is provided with a protruding internal thread that cooperates with the external thread.

[0007] A thread sealant is provided at the threaded connection between the hollow cavity of the plunger and the plug.

[0008] Annular grooves are arranged on both the hollow cavity of the plunger and the plunger plug.

[0009] The plunger plug is a double-headed plug, and the double-headed plug is in an I shape.

[0010] Both ends of the plunger plug are connected with the hollow cavity of the plunger through threads.

[0011] The end of the plunger plug is provided with an installation groove for convenient installation and disassembly.

[0012] The utility model has the following advantages: In the novel hollow plunger device of the utility model, the plunger plug is arranged inside the plunger through threads, which simplifies the assembly difficulty and is convenient for operation; grooves are provided both inside the plunger and on the plug, which is convenient for reducing the overall weight; the plunger plug is a double-headed plug with a throttle hole, which can reduce the rotational inertia of the plunger and the pulsation and impact of the plunger pump, thereby improving the volumetric efficiency of the pump and the dynamic response speed of the pump, reducing the pressure impact of the plunger pump, and prolonging the service life of the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings, as part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0014] In the drawings:

[0015] Figure 1 is the overall structural schematic diagram of the present utility model;

[0016] Figure 2 is the structural schematic diagram of the plunger plug of the present utility model;

[0017] Figure 3 is the cross-sectional schematic diagram of the plunger plug of the present utility model;

[0018] Figure 4 is the structural schematic diagram of the plunger of the present utility model.

[0019] In the figure: 1. Plunger, 2. Plunger plug.

[0020] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] As Figures 1 to 4 shown, a novel hollow plunger device includes a hollow plunger 1. A plunger plug 2 is provided in the hollow cavity of the plunger 1. The plunger plug 2 is connected to the hollow cavity of the plunger 1 by a thread. Throttle holes are provided on the central axes of both the plunger 1 and the plunger plug 2. After the plunger plug 2 is installed into the hollow cavity of the plunger 1, the throttle hole of the plunger 1 communicates with the throttle hole of the plunger plug 2. In the novel hollow plunger device of the present utility model, the inside of the plunger adopts a hollow structure. A plunger plug is disposed in the hollow cavity. The plunger plug is fixed inside the plunger by a thread. This assembly method is not only convenient for use, but also reduces the processing difficulty and improves the production efficiency of the equipment. At the same time, throttle holes are provided on the axis of the plunger, and the plunger plug is also provided with throttle holes, which are communicated with the throttle holes of the plunger, so as to reduce the impact of high-pressure oil on the slipper and extend the service life.

[0025] As Figure 1 shown, in a novel hollow plunger device, the hollow cavity of the plunger 1 is cylindrical. The outer circle of the plunger plug 2 is provided with an external thread, and the inner wall of the hollow cavity of the plunger 1 is provided with a protruding internal thread that cooperates with the external thread. A thread sealant is provided at the threaded connection between the hollow cavity of the plunger 1 and the plug 2. The hollow cavity of the plunger of the present utility model is cylindrical. In order to facilitate connection with the plunger plug by a thread, the inner wall of the hollow cavity is provided with a protruding internal thread, and the outer circle of the plunger plug is provided with an external thread for assembling with the plunger. Among them, a thread sealant is used for anti-loosening during the assembly of the plunger and the plunger plug to prevent the parts from falling off when the pressure repeatedly impacts during the operation of the plunger, thereby improving the reliability of the equipment in use.

[0026] As Figures 1 to 4A novel hollow plunger device is shown, wherein an annular groove is provided on the hollow cavity of the plunger 1 and the plunger plug 2. The inner hole of the plunger and the outer circle of the plunger plug of the utility model are provided with an annular groove, which is used to reduce the weight of the plunger and the plunger plug, reduce the moment of inertia, and improve the dynamic response of the pump.

[0027] like Figures 1 to 4 A novel hollow plunger device is shown, wherein the plunger plug 2 is a double-headed plug, and the double-headed plug is I-shaped. Both ends of the plunger plug 2 are connected to the hollow cavity of the plunger 1 through threads. The plunger plug of the utility model is a double-headed plug, and both ends of the plunger plug are threadedly connected to the hollow cavity inside the plunger to reduce the pressure loss of the oil.

[0028] like Figure 3 A new hollow plunger device is shown, and the end of the plunger plug 2 is provided with a mounting groove for convenient rotation and disassembly. One end of the plunger plug of the utility model has a slot or a cross slot, which is convenient for locking during assembly and convenient for disassembly.

[0029] The new hollow plunger device of the utility model has a simple structure and is easy to process at a low cost by arranging a plunger plug in the middle of the plunger; by arranging threads in the inner hole of the plunger and on the outer circle of the plunger plug, the plunger plug can be easily installed, the structure is simple and reliable, and the reliability of the pump is improved; by arranging annular grooves in the inner hole of the plunger and on the outer circle of the plunger plug, the weight of the plunger is reduced, the moment of inertia is reduced, and the dynamic response of the pump is improved; a throttle hole is arranged in the middle of the plunger plug and is connected to the plunger throttle hole, so that the impact of high-pressure oil on the sliding shoe is reduced, the life of the plunger pump is improved, and the noise of the entire pump can be reduced; at the same time, a slot or a cross slot or a hexagon socket is arranged on one side of the plunger plug for easy assembly; the plunger and the plunger plug are connected by internal and external threads, and thread glue is used to prevent loosening reliably. The technical scheme of the present application can improve the volumetric efficiency of the pump and the dynamic response speed of the pump, reduce the pressure shock of the plunger pump, and extend the service life.

[0030] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0031] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present utility model and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by the present application.

[0032] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present utility model, can make some changes or modifications using the technical content prompted above to form equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A novel hollow plunger device, characterized in that: It comprises a hollow plunger (1), a plunger plug (2) is provided in the hollow cavity of the plunger (1), the plunger plug (2) is connected to the hollow cavity of the plunger (1) through a thread, the central axis of the plunger (1) and the plunger plug (2) are both provided with a throttle hole, and after the plunger plug (2) is installed in the hollow cavity of the plunger (1), the throttle hole of the plunger (1) and the throttle hole of the plunger plug (2) are interconnected; An annular groove is provided on the hollow cavity of the plunger (1) and the plunger plug (2).

2. A novel hollow plunger device as claimed in claim 1, characterized in that: The hollow cavity of the plunger (1) is cylindrical, the outer circle of the plunger plug (2) is provided with an external thread, and the inner wall of the hollow cavity of the plunger (1) is provided with a protruding internal thread used in conjunction with the external thread.

3. A novel hollow plunger device as claimed in claim 2, characterized in that: A thread glue is provided at the threaded connection between the hollow cavity of the plunger (1) and the plug (2).

4. A novel hollow plunger device as claimed in claim 1, characterized in that: The plunger plug (2) is a double-headed plug, and the double-headed plug is I-shaped.

5. A novel hollow plunger device as claimed in claim 4, characterized in that: Both ends of the plunger plug (2) are connected to the hollow cavity of the plunger (1) via threads.

6. A novel hollow plunger device as claimed in claim 1, characterized in that: The end of the plunger plug (2) is provided with a mounting groove for easy installation and disassembly.

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