Plunger pump and tractor

Abstract

The utility model relates to the technical field of hydraulic pumps, in particular to a plunger pump and a tractor. The plunger pump comprises a booster pump and a main pump, an oil inlet of the booster pump is communicated with an oil tank, and an oil inlet of the main pump is communicated with an oil outlet of the booster pump through a pipeline. A first external connection port, a first one-way valve and a shunting port are sequentially arranged on a pipeline for communicating the booster pump and the main pump, the first external connection port is externally connected with a remote filter, the first one-way valve enables oil to be unidirectionally conducted from the booster pump to the main pump, second external connection ports are arranged on the front side and the rear side of the first one-way valve, and the shunting port is communicated with the first external connection port. The second external connection port is externally connected with a remote cooler, and the flow dividing port is used for being communicated with the outside of the pump. The oil temperature can be effectively reduced, the reliability of the whole pump is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pumps, in particular to a piston pump and a tractor. Background Technique

[0002] A piston pump is a hydraulic component widely used in the fields of construction machinery, agricultural machinery, etc., mainly used to provide high-pressure liquid to drive various hydraulic actuators. The piston pump has the advantages of high efficiency, high pressure, long service life, etc., and is particularly suitable for providing power input for hydraulic systems. With the continuous improvement of the requirements for performance and reliability of mechanical equipment, higher requirements are also put forward for the design of piston pumps.

[0003] At present, the common tractor piston pumps on the market mainly rely on the internal working oil chamber to provide hydraulic oil, and a filter device is usually equipped in the hydraulic system to ensure the cleanliness of the oil. However, under certain specific continuous long-time operation conditions of the tractor, the traditional piston pump has too high oil temperature due to long-time operation, resulting in reduced reliability of the pump or direct damage to the pump. In addition, under the scenario of large load, it cannot provide enough pressure, affecting the normal operation of the hydraulic system, and there will be relatively large noise during the operation process due to poor oil suction or load fluctuation, affecting the use experience of the equipment and the environmental noise level. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the embodiment of the utility model is to provide a piston pump.

[0005] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0006] A piston pump includes: a booster pump and a main pump. The inlet of the booster pump is communicated with the fuel tank, and the inlet of the main pump is communicated with the outlet of the booster pump through a pipeline. A first external port, a first one-way valve and a diversion port are sequentially arranged on the pipeline connecting the booster pump and the main pump. The first external port is externally connected to a remote filter, and the first one-way valve enables the oil to conduct unidirectionally from the booster pump to the main pump. A second external port is arranged on both sides of the first one-way valve, and the second external port is externally connected to a remote cooler. The diversion port is used to communicate with the outside of the pump.

[0007] Optionally, the piston pump includes a housing. One end of the housing is provided with a drive shaft, and a rear end cover is arranged on one side of the housing. The rear end cover has a first step surface and a second step surface. The first step surface is perpendicular to the axis of the drive shaft, and the second step surface is perpendicular to the first step surface. The second external port includes a cooler inlet and a cooler outlet. The cooler inlet is arranged on the first step surface, the cooler outlet is arranged on the second step surface, and the first one-way valve is obliquely arranged on the first step surface.

[0008] Optionally, the rear end cover further includes a third stepped surface perpendicular to both the first stepped surface and the second stepped surface. The diversion port is arranged on the third stepped surface, the first external connection port is the oil inlet / outlet of the filter, and the oil inlet / outlet of the filter is arranged on the second stepped surface.

[0009] Optionally, the plunger pump further includes an internal filter disposed on the pipeline between the booster pump and the fuel tank.

[0010] Optionally, the plunger pump further includes a second one-way valve connected in parallel with the booster pump, and the second one-way valve can achieve one-way conduction from the oil outlet of the booster pump to the oil inlet of the booster pump.

[0011] Optionally, the plunger pump is provided with a fifth pressure measurement port and a sixth pressure measurement port, which are arranged on the pipeline between the booster pump and the remote filter.

[0012] Optionally, the plunger pump is provided with a first pressure measurement port and a third pressure measurement port. The first pressure measurement port is arranged on the pipeline between the remote cooler and the main pump, and the third pressure measurement port is arranged at the oil inlet of the main pump.

[0013] Optionally, the main pump of the plunger pump has a pump liquid outlet, and a second pressure measurement port is arranged on the front side of the pump liquid outlet.

[0014] Optionally, a relief valve is further arranged on the front side of the pump liquid outlet.

[0015] An embodiment of the present invention further provides a tractor, including the plunger pump as described above.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0017] 1. The plunger pump provides a higher oil suction pressure through a booster pump, avoiding insufficient oil suction or cavitation, reducing the load on the main pump, lowering noise, and improving the operating comfort of the system. The setting of a remote cooler can effectively reduce the oil temperature, improve the reliability and lifespan of the entire pump. By equipping with an external cooler port, remote connection of an external cooler can be achieved through the port. Compared with the method of an internal cooler, the modification to the plunger pump is small, and various models can be adapted by connecting an external cooler. While achieving temperature control, it does not affect the installation of the plunger pump, providing more options for the overall machine space layout. Further, the remote cooler is set on the pipeline between the booster pump and the main pump, and is protected by a first one-way valve. The oil is cooled before entering the main pump to prevent high temperature from damaging the main pump. The oil temperature can be more effectively controlled at this position, ensuring that the main pump operates at the optimal temperature. At the same time, the pressure increased by the booster pump helps to more effectively pass through the cooler, thus achieving a better cooling effect.

[0018] 2. When a filter is already set at the outlet of the fuel tank for this plunger pump, adding a filter after the booster pump can ensure that the oil is purer when entering the cooler and the main pump, prevent blockage of the cooler, avoid failures and efficiency reduction caused by particle contamination, thereby reducing wear and extending the equipment lifespan.

[0019] 3. The plunger pump sets a diversion port on the pipeline between the booster pump and the main pump. The diversion port can divert part of the oil, adjust the oil flow for other components, and can adjust the oil flow direction according to different working conditions to optimize the system operation, thereby improving the overall efficiency of the system. Moreover, it avoids the overload of the main pump due to excessive oil suction and ensures its normal operation.

[0020] Advantages of additional aspects of the present utility model will be given in the following description, some of which will become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0021] The specification drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0022] Figure 1 It is the schematic diagram of the plunger pump provided by the embodiment of the present utility model;

[0023] Figure 2 It is the first perspective schematic diagram of the plunger pump provided by the embodiment of the present utility model;

[0024] Figure 3 It is the second perspective schematic diagram of the plunger pump provided by the embodiment of the present utility model;

[0025] In the figure: 1, fuel tank; 2, built-in filter; 3, fourth pressure measuring port; 4, booster pump; 5, second one-way valve; 6, fifth pressure measuring port; 7, sixth pressure measuring port; 8, remote filter; 9, first one-way valve; 10, remote cooler; 11, shunt port; 12, first pressure measuring port; 13, second pressure measuring port; 14, pump liquid outlet; 15, control port; 16, controller; 17, servo system; 18, main pump; 19, third pressure measuring port; 20, drain port; 21, relief valve; 22, drive shaft; 23, housing; 24, cooler inlet; 25, rear end cover; 26, filter inlet and outlet; 27, cooler outlet; 28, suction port;

[0026] The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration. Detailed implementation mode

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Term explanation:

[0029] Plunger pump: An axial piston hydraulic pump used to provide high-pressure liquid for construction machinery;

[0030] Cooler: A device for reducing the oil temperature of the whole machine;

[0031] Filter: Filter the oil to ensure the cleanliness of the hydraulic oil;

[0032] Controller: A device for controlling the flow and pressure of the whole pump;

[0033] As introduced in the background technology, under specific working conditions, the continuous temperature rise of the oil is likely to cause damage to the plunger pump, shorten its service life, fail to meet the requirements of long-term working conditions, affect the reliability and service life of the plunger pump, and there are also problems such as insufficient pressure and noise. To solve the above problems, this embodiment proposes a plunger pump to provide power input for the hydraulic actuator as the main pump of the tractor.

[0034] Such as Figure 1As shown in the figure, the piston pump includes a booster pump 4 and a main pump 18. The inlet of the booster pump 4 is connected to the fuel tank 1, and the inlet of the main pump 18 is connected to the outlet of the booster pump 4 through a pipeline. A first external port, a first one-way valve 9, and a diversion port 11 are sequentially arranged on the pipeline connecting the booster pump 4 and the main pump 18. The first external port is externally connected to a remote filter 8. The first one-way valve 9 enables the oil to conduct unidirectionally from the booster pump 4 to the main pump 18. A second external port is arranged on both sides of the first one-way valve 9, and the second external port is externally connected to a remote cooler 10. The diversion port 11 is used to communicate with the outside of the pump.

[0035] The piston pump provides a higher oil suction pressure through the booster pump 4, avoiding insufficient oil suction or cavitation, reducing the load of the main pump 18, lowering the noise, and improving the operating comfort of the system.

[0036] The setting of the remote cooler 10 can effectively reduce the oil temperature, improving the reliability and service life of the whole pump. By equipping the external port of the cooler, the remote connection of the external cooler can be realized through the port. Compared with the built-in cooler, the modification of the piston pump is small, and various models can be adapted through the external cooler. While achieving temperature control, it does not affect the installation of the piston pump, making the selection of the overall machine space layout more flexible.

[0037] Furthermore, the remote cooler 10 is arranged on the pipeline between the booster pump 4 and the main pump 18, and is protected by the first one-way valve 9 at the same time. The oil is cooled before entering the main pump 18, preventing the main pump 18 from being damaged by high temperature. The oil temperature can be more effectively controlled at this position, and the main pump 18 can work at the optimal temperature. At the same time, the pressure increased by the booster pump 4 helps to pass through the cooler more effectively, thus achieving a better cooling effect.

[0038] In the conventional method, a filter is set at the position of the fuel tank 1. In the case where a filter has been set at the outlet of the fuel tank 1 of this piston pump, adding a filter after the booster pump 4 can ensure that the oil is purer when entering the cooler and the main pump 18, preventing the cooler from being blocked, avoiding failures and efficiency reduction caused by particle contamination, thereby reducing wear and extending the service life of the equipment.

[0039] Since the displacement of the booster pump 4 is much larger than the required displacement of the main pump 18, the piston pump is provided with a diversion port 11 on the pipeline between the booster pump 4 and the main pump 18. The diversion port 11 can divert part of the oil, adjust the oil flow for other components, and can adjust the oil flow direction according to different working conditions, optimizing the system operation, thereby improving the overall efficiency of the system. Moreover, it avoids the overload of the main pump 18 due to excessive oil suction, ensuring its normal operation.

[0040] Such as Figure 2 、 Figure 3As shown, a drive shaft 22 is provided at one end of the housing 23. The controller 16 is arranged on the housing 23. The drive shaft 22 is the power input port of the plunger pump. The control oil circuit runs through the interior of the housing 23. A rear end cover 25 is provided on one side of the housing 23. A plurality of oil circuits are arranged inside the rear end cover 25. Oil ports such as check valves, relief valves 21, coolers, filters, and pressure measurement ports are placed on the rear end cover 25. The layout is reasonable and the integration degree is high. Specifically, the rear end cover 25 has a first stepped surface and a second stepped surface. The first stepped surface is perpendicular to the axis of the drive shaft 22, and the second stepped surface is perpendicular to the first stepped surface. In order to achieve the cooling function, the second external port includes a cooler inlet 24 and a cooler outlet 27. The cooler inlet 24 is arranged on the first stepped surface, and the cooler outlet 27 is arranged on the second stepped surface. The first check valve 9 is inclined and arranged on the first stepped surface. The cooler inlet 24 and the first check valve 9 are arranged on the first stepped surface, while the cooler outlet 27 is arranged on the second stepped surface. This arrangement saves space, the external layout is compact, the center of gravity is centered, and it is coordinated and beautiful.

[0041] The rear end cover 25 further includes a third stepped surface. The third stepped surface is perpendicular to both the first stepped surface and the second stepped surface. The shunt port 11 is arranged on the third stepped surface. The first external port is the filter inlet and outlet 26, and the filter inlet and outlet 26 are arranged on the second stepped surface.

[0042] The shunt port 11 is arranged on the third stepped surface to adjust the flow rate of the oil fluid, so as to meet the requirements of different working conditions. The first external port, as the filter inlet and outlet, is arranged on the second stepped surface. Such a layout not only improves the purity of the oil fluid, but also effectively protects the main pump 18 and the cooler, and extends the service life of the equipment.

[0043] The plunger pump further includes a built-in filter 2. The built-in filter 2 is arranged on the pipeline between the booster pump 4 and the fuel tank 1 to remove possible impurities before the oil fluid enters the booster pump 4, so as to ensure the safety and stability of the booster pump 4 and the subsequent system. Through this multi-layer filtering mechanism, the cleanliness of the oil fluid is greatly improved, and the risk of system failure is reduced.

[0044] To further improve the reliability of the system, the plunger pump further includes a second check valve 5. The second check valve 5 is arranged in parallel with the booster pump 4, and the second check valve 5 can achieve one-way conduction from the outlet of the booster pump 4 to the inlet of the booster pump 4. This check valve is arranged in parallel with the booster pump 4 to prevent accidental reverse flow of the booster pump 4, protect the internal structure of the pump, and avoid damage caused by overpressure, thereby extending the service life of the equipment.

[0045] The plunger pump is provided with a fifth pressure measuring port 6 and a sixth pressure measuring port 7. The fifth pressure measuring port 6 and the sixth pressure measuring port 7 are arranged on the pipeline between the booster pump 4 and the remote filter 8, and can monitor the pressure in front of the remote filter 8 in real time, providing immediate information about the filter status, so as to remind the user when maintenance or filter replacement is needed, and ensure the normal operation of the system.

[0046] The plunger pump of this embodiment is further provided with a first pressure measuring port 12 and a third pressure measuring port 19 for monitoring the pressure changes at different positions. The first pressure measuring port 12 is arranged on the pipeline between the remote cooler 10 and the main pump 18 to monitor the pressure of the cooled oil to ensure that it is in the best state before entering the main pump 18. The third pressure measuring port 19 is arranged at the oil inlet of the main pump 18 to monitor the pressure of the oil when it enters the main pump 18. Through the coordinated work of these two pressure measuring ports, the pressure changes of the oil at different stages can be effectively grasped to ensure the stable operation of the plunger pump.

[0047] To further optimize the monitoring ability of the system, a second pressure measuring port 13 is also arranged on the front side of the liquid outlet 14 of the main pump 18 in this embodiment. This pressure measuring port is used to monitor the pressure of the oil output by the main pump 18 to ensure that it reaches the set working standard. Through this design, abnormal pressure conditions in the system can be detected and processed in time to prevent system failures caused by too high or too low pressure.

[0048] In the design of this embodiment, to enhance the safety of the system, a relief valve 21 is also arranged on the front side of the liquid outlet 14 of the main pump 18, and a fourth pressure measuring port 3 is arranged at the position of the relief valve 21. The relief valve 21 is used to discharge the excess oil when the system pressure is too high, so as to protect other components of the system from overpressure damage. Through this dual protection mechanism, the operation of the plunger pump is safer and more reliable, and it is suitable for various complex working conditions.

[0049] The main oil in the plunger pump flows into the booster pump 4 (the booster pump 4 is also provided with an oil drain port 20) and the main pump 18 from the oil suction port 28, and high-pressure oil is output from the main pump 18 under the combined control of the servo system 17 and the control port 15 of the controller 16. Each pressure measuring port is responsible for monitoring the oil port pressure of the plunger pump. By arranging multiple pressure measuring ports at different positions, it is convenient to conduct a full-range monitoring of the plunger pump status, increase the flexibility of the client ports, provide multiple solutions for the customer, and is beneficial to designing the optimal installation layout of the whole machine and saving costs.

[0050] The plunger pump of this embodiment can be widely applied to various engineering machinery and equipment (such as tractors), especially in occasions where high-pressure and high-efficiency hydraulic power are required. Through the coordinated operation of its booster pump 4, main pump 18, remote filter 8, cooler and other components, the plunger pump can provide stable hydraulic power, effectively control the oil temperature and oil cleanliness, meet the usage requirements under long-term and complex working conditions, and improve the overall operation efficiency and reliability of the equipment.

[0051] Although the specific implementation manners of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A plunger pump, characterized in that: include: A booster pump and a main pump, wherein the oil inlet of the booster pump is connected to the oil tank, and the oil inlet of the main pump is connected to the oil outlet of the booster pump through a pipeline; A first external port, a first one-way valve and a diversion port are sequentially arranged on the pipeline connecting the boost pump and the main pump. The first external port is externally connected to a remote filter. The first one-way valve allows oil to flow unidirectionally from the boost pump to the main pump. A second external port is arranged on both sides of the front and rear of the first one-way valve. The second external port is externally connected to a remote cooler. The diversion port is used to communicate with the outside of the pump.

2. The plunger pump according to claim 1, characterized in that The plunger pump includes a shell, a drive shaft is provided at one end of the shell, a rear end cover is provided on one side of the shell, the rear end cover has a first step surface and a second step surface, the first step surface is perpendicular to the axis of the drive shaft, the second step surface is perpendicular to the first step surface, the second external port includes a cooler oil inlet and a cooler oil outlet, the cooler oil inlet is arranged on the first step surface, the cooler oil outlet is arranged on the second step surface, and the first one-way valve is arranged obliquely on the first step surface.

3. The plunger pump according to claim 2, characterized in that The rear end cover also includes a third step surface, which is perpendicular to the first step surface and the second step surface. The diverter port is arranged on the third step surface. The first external port is the oil inlet and outlet of the filter, and the oil inlet and outlet of the filter are arranged on the second step surface.

4. The plunger pump according to claim 1, characterized in that The plunger pump further comprises a built-in filter, which is arranged on a pipeline between the booster pump and the oil tank.

5. The plunger pump according to claim 1, characterized in that The plunger pump further comprises a second one-way valve, which is connected in parallel with the boost pump and can achieve one-way conduction from the oil outlet of the boost pump to the oil inlet of the boost pump.

6. The plunger pump according to claim 1, characterized in that The plunger pump is provided with a fifth pressure measuring port and a sixth pressure measuring port, and the fifth pressure measuring port and the sixth pressure measuring port are arranged on the pipeline between the booster pump and the remote filter.

7. The plunger pump according to claim 1, characterized in that The plunger pump is provided with a first pressure measuring port and a third pressure measuring port. The first pressure measuring port is provided on the pipeline between the remote cooler and the main pump, and the third pressure measuring port is provided at the oil inlet of the main pump.

8. The plunger pump according to claim 1, characterized in that The main pump of the plunger pump has a pump fluid outlet, and a second pressure measuring port is arranged in front of the pump fluid outlet.

9. The plunger pump according to claim 8, characterized in that An overflow valve is also arranged on the front side of the pump fluid outlet.

10. A tractor, characterized in that: Comprising a plunger pump as described in any one of claims 1-9.

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