Tandem structure integrating plunger pump and gear pump into same inlet

Abstract

The utility model provides a series connection structure integrating a plunger pump and a gear pump into the same inlet, which relates to the technical field of open type hydraulic systems and comprises the plunger pump and the gear pump, the gear pump is connected with the plunger pump through a connecting shaft, and the series connection structure is arranged between the plunger pump and the gear pump. The series connection structure comprises a cavity which is arranged on the axis and allows the connecting shaft to operate. A first oil way is arranged on one side of the cavity, one end of the first oil way is provided with an inlet S in the serial connection structure, and the other end of the first oil way is connected with the plunger pump; a second oil way is arranged on the other side of the cavity, one end of the second oil way is provided with an outlet B1 on the serial connection structure, and the other end of the second oil way is connected with the plunger pump; a third oil way is arranged on the side, facing the gear pump, of the first oil way, and the end, away from the first oil way, of the third oil way is connected with the gear pump. According to the utility model, the serial connection structure is more compact, and the space proportion of the serial pump in an open system is optimized.

Description

Technical Field

[0001] This utility model relates to the field of open hydraulic system technology, and in particular to a series structure that integrates a piston pump and a gear pump into the same inlet. Background Technology

[0002] With the continuous advancement of technology in construction and mining machinery, the functional requirements of main control systems are increasing, no longer satisfied with simply achieving control functions through piston pumps. Many open-system main control units employ a series connection of piston pumps and gear pumps to meet various control needs. For example, by connecting piston pumps and gear pumps in series, the specific pressure and flow required for the lifting and tilting of the loader's working devices, such as the bucket, as well as the vehicle's steering and movement, can be provided. Furthermore, the series connection structure of piston pumps and gear pumps also offers advantages such as complementary flow and pressure, enhanced system stability, improved system efficiency, and reduced production costs.

[0003] However, the current series connection method for piston pumps and gear pumps is relatively simple, requiring a transition flange for connection. The gear pump inlet must be connected separately to the oil tank via a pipeline. This series connection not only occupies more space, but also makes it difficult to dissipate the heat generated by the piston pump during operation, leading to oil leaks. Summary of the Invention

[0004] This utility model provides a series structure that integrates a plunger pump and a gear pump into the same inlet. The purpose is to provide a structure that allows the plunger pump and the gear pump to be connected to the oil tank inlet through the same inlet oil circuit, and to eliminate the connecting flange between the plunger pump and the gear pump, making the series structure more compact.

[0005] This utility model provides the following technical solution to achieve the above objectives:

[0006] A series structure integrating a plunger pump and a gear pump with a single inlet includes a plunger pump and a gear pump, the gear pump being connected to the plunger pump via a connecting shaft. A series structure is provided between the plunger pump and the gear pump, the series structure including a chamber arranged on an axis for the connecting shaft to rotate; a first oil passage is provided on one side of the chamber, one end of which has an inlet S on the series structure, and the other end of which is connected to the plunger pump inlet; a second oil passage is provided on the other side of the chamber, one end of which has an outlet B1 on the series structure, and the other end of which is connected to the plunger pump outlet; a third oil passage is provided on the side of the first oil passage facing the gear pump, the end of the third oil passage furthest from the first oil passage being connected to the gear pump inlet.

[0007] Furthermore, a through hole is provided on one side of the adjacent chamber of the third oil passage.

[0008] Furthermore, the gear pump has an outlet B2 located on the same side as outlet B1.

[0009] Furthermore, a sealing ring is provided on the contact surface between the gear pump and the series structure.

[0010] Furthermore, the gear pump is fixedly mounted on the series structure by connecting screws, which are evenly distributed around the gear pump.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] This invention provides a series structure that allows the plunger pump and gear pump to connect to the oil tank inlet through the same inlet oil circuit, eliminating the connecting flange between the two, making the series structure more compact, and optimizing the space ratio of the series pumps in the open system; and by optimizing the oil circuit structure, the overall oil leakage points are reduced. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0015] Reference numerals in the attached drawings: 1-plunger pump; 2-gear pump; 3-tandem structure; 4-chamber; 5-first oil passage; 6-second oil passage; 7-third oil passage; 8-connecting screw; 9-connecting shaft; 10-sealing ring. Detailed Implementation

[0016] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0017] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Example. A series structure integrating a plunger pump and a gear pump with the same inlet, structural reference. Figures 1 to 2 The system includes a plunger pump 1 and a gear pump 2. The gear pump 2 is connected to the plunger pump 1 via a connecting shaft 9. A series structure 3 is provided between the plunger pump 1 and the gear pump 2. The series structure 3 includes a chamber 4 arranged on the axis for the connecting shaft 9 to rotate. A first oil passage 5 is provided on one side of the chamber 4. One end of the first oil passage 5 has an inlet S on the series structure 3, and the other end of the first oil passage 5 is connected to the inlet of the plunger pump 1. A second oil passage 6 is provided on the other side of the chamber 4. One end of the second oil passage 6 has an outlet B1 on the series structure 3, and the other end of the second oil passage 6 is connected to the outlet of the plunger pump 1. A third oil passage 7 is provided on the side of the first oil passage 5 facing the gear pump 2. The end of the third oil passage 7 away from the first oil passage 5 is connected to the inlet of the gear pump 2. The gear pump 2 is fixedly mounted on the series structure 3 by connecting screws, which are evenly distributed around the gear pump 2.

[0020] By setting up chamber 4, the internal leakage generated inside the plunger pump 1 flows into chamber 4. Utilizing the self-priming capability of gear pump 2, the internal leakage is carried into gear pump 2 along with the hydraulic oil through the third oil passage 7 and finally discharged from the entire structure, simultaneously dissipating the waste heat generated during the operation of plunger pump 1. The inlet of gear pump 2 is designed on the contact surface with the series structure 3 and is connected to the inlet of plunger pump 1 through the first oil passage 5 and the third oil passage 7. Compared with the existing structure, the mounting flange is eliminated, and connecting bolts are used to connect the front cover of gear pump 2 and the rear cover of plunger pump 1 in series, resulting in a more compact overall structure. This effectively reduces the volume of gear pump 2 and plunger pump 1, significantly shortens the overall length of the series pump, and reduces the volume of the series pump. The aforementioned structural method reduces the connection between the inlet pipeline of gear pump 2 and the return oil pipeline of plunger pump 1, lowering the overall cost and reducing the number of oil leakage points.

[0021] A through hole is provided on one side of the adjacent chamber 4 of the third oil passage 7. An outlet B2 is provided on the same side as the outlet B1 of the gear pump 2. The through hole allows oil leaking from the connecting shaft 9 during operation to enter the gear pump 2 through the third oil passage 7 and finally be discharged from the outlet B2.

[0022] A sealing ring 10 is provided on the contact surface between the gear pump 2 and the series structure 3. The sealing ring 10 ensures the sealing of the contact surface between the gear pump 2 and the series structure 3, preventing oil from leaking out from the contact surface.

[0023] Obviously, the above description is only a part of the embodiments of this utility model, and not all of them. The above embodiments are not intended to limit this utility model, and various modifications and variations can be made to this utility model by those skilled in the art. Any combination, modification, equivalent substitution, improvement, and all other embodiments that can be made by those skilled in the art within the spirit and principles of this utility model should be within the protection scope of this utility model.

Claims

1. A series structure integrating a plunger pump and a gear pump in the same inlet, comprising a plunger pump (1) and a gear pump (2), the gear pump (2) being connected with the plunger pump (1) through a connecting shaft (9), characterized in that: The plunger pump (1) and gear pump (2) are provided with a series structure (3), the series structure (3) includes a cavity (4) provided on the axis for the operation of the connecting shaft (9); one side of the cavity (4) is provided with a first oil path (5), one end of the first oil path (5) is provided with an inlet S on the series structure (3), the other end of the first oil path (5) is connected with the inlet of the plunger pump (1); the other side of the cavity (4) is provided with a second oil path (6), one end of the second oil path (6) is provided with an outlet B1 on the series structure (3), the other end of the second oil path (6) is connected with the outlet of the plunger pump (1); the first oil path (5) is provided with a third oil path (7) on the side facing the gear pump (2), the end of the third oil path (7) away from the first oil path (5) is connected with the inlet of the gear pump (2).

2. The series connection structure of integrating the plunger pump and the gear pump into the same inlet according to claim 1, characterized in that: The third oil path (7) is provided with a through hole on the side adjacent to the cavity (4).

3. The series connection structure of integrating the plunger pump and the gear pump into the same inlet according to claim 1, characterized in that: The gear pump (2) is provided with an outlet B2 on the same side as the outlet B1.

4. The series connection structure of integrating the plunger pump and the gear pump into the same inlet according to claim 1, characterized in that: The contact surface of the gear pump (2) and the series structure (3) is provided with a sealing ring (10).

5. The series connection structure of integrating the plunger pump and the gear pump into the same inlet according to claim 1, characterized in that: The gear pump (2) is fixedly installed on the series structure (3) through connecting screws, and the connecting screws are uniformly arranged around the gear pump (2).

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