An integrated hydraulic oil tank

Abstract

The utility model discloses to the prior art control valve and oil tank split type setting, connecting control valve and the pipeline of oil tank is complex, space occupies big, pressure loss and energy increase leakage risk high, reliability is bad, long connecting pipe causes the deficiency of system response tardy, provide integrated hydraulic oil tank, this integrated hydraulic oil tank, including oil tank and control valve, control valve is located in the oil tank box body, is provided with at least two control valve connecting port on control valve connecting face, two control valve connecting port as control valve oil inlet and control valve oil outlet, control valve oil inlet and control valve oil outlet are communicated with the valve core cavity of control valve respectively, adopt the integrated hydraulic oil tank provided by the utility model greatly simplifies system, can eliminate external pipeline, significantly reduce the leakage point, reduce pressure loss and energy consumption, improve system response speed.

Description

Technical Field

[0001] This utility model relates to the field of fluid power control technology, and in particular to an integrated hydraulic oil tank. Background Technology

[0002] Hydraulic transmission technology, with its advantages of high power density, rapid response, and high control precision, is widely used in many fields such as industrial machinery, engineering machinery, aerospace, and shipbuilding. For a long time, in most hydraulic system designs, hydraulic control valve assemblies and hydraulic oil tanks have been considered two independent functional units, typically using a separate layout. Various valve assemblies, whether plate-type, cartridge-type, or stacked, are often centrally installed on the valve rack or in specific control areas of the equipment, connected to the hydraulic pump, actuators, and hydraulic oil tank through complex piping networks such as pressure pipes, return pipes, drain pipes, and control pipes. This traditional separate layout has gradually revealed many inherent drawbacks in practice, such as complex piping, large space occupation, increased pressure loss and energy consumption, high leakage risk, decreased reliability, system response lag due to longer piping, increased difficulty in controlling oil contamination, and inconvenience in installation and maintenance. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies where the control valve and oil tank are separate units, resulting in complex piping, large space occupation, increased pressure loss and energy leakage risk, poor reliability, and slow system response due to long connecting pipes. It provides an integrated hydraulic oil tank.

[0004] The technical problem solved by this utility model is achieved through the following technical solution:

[0005] An integrated hydraulic oil tank includes an oil tank and a control valve. The control valve is located inside the oil tank. At least two control valve connection ports are provided on the control valve connection surface. The two control valve connection ports serve as the control valve inlet and the control valve outlet. The control valve inlet and the control valve outlet are respectively connected to the valve core cavity of the control valve. The control valve connection ports are sealed to the external oil passage through the oil tank connection port provided on the oil tank body, or the control valve connection surface seals the oil tank window. The control valve connection ports are arranged opposite to the oil tank window or inside the oil tank window. The control valve connection ports are used to connect to the external oil circuit.

[0006] It also includes an integrated valve block, on which a valve block interface is provided on the mating surface. The integrated valve block interface is sealed to the control valve connection port. The connecting surface of the integrated valve block is provided with a valve block connection port. The valve block interface and the valve block connection port are connected through an internal oil passage provided in the integrated valve block. The valve block interface is sealed to the corresponding control valve connection port. The valve block connection port is sealed to the external oil passage through an oil tank connection port provided on the oil tank body. Alternatively, the integrated valve connecting surface can seal and block the oil tank window. The integrated valve connection port is opposite to or located inside the oil tank window. The control valve connection port is connected to the external oil circuit through the valve block connection port.

[0007] The oil tank suction port is fixedly and sealed to the bottom plate of the oil tank. Its oil inlet side is used to connect to the external oil passage, and its oil outlet side is connected to the inner cavity of the oil tank.

[0008] The oil tank level gauge is installed on the side plate of the oil tank and is used to observe the liquid level in the oil tank;

[0009] The top plate of the fuel tank is provided with a fuel tank inlet. The fuel tank air filter is installed at the fuel tank inlet and fixedly connected to the top plate of the fuel tank. It is used for refueling the fuel tank and filtering impurities in the air.

[0010] The control valve and the integrated valve block are stacked and fixedly connected, and the two are fixed and sealed by bolts.

[0011] All valve block connection ports are located on the same valve block connection surface, all valve block mating interfaces are located on the same valve block mating surface, and the control valve connection port is located on the same control valve connection surface.

[0012] A threaded hole is provided on the valve block connection surface. The threaded hole communicates with the internal oil passage. The threaded cartridge valve is installed in the threaded hole. The threaded cartridge valve and each valve block connection port are located on the same valve block connection surface.

[0013] The external oil passage is equipped with power components and actuators, and each valve block connection port is used to seal and connect with the oil pressure port of the power component, the oil inlet of the actuator, and the oil outlet of the power component.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] Integrating hydraulic control valves into the hydraulic tank or forming a closely integrated structure with it has significant theoretical advantages and potential engineering value.

[0016] 1. Significantly simplifies the system, eliminates external piping, and greatly reduces leakage points: The pressure oil lines, return oil lines, and drain oil lines between the control valve and the oil tank can be directly connected within the internal flow channels of the control valve, almost completely eliminating expensive, bulky, and leak-prone external piping, greatly reducing material costs and installation time. The elimination of external piping directly means a significant reduction in leakage sources, greatly improving the system's sealing reliability and environmental friendliness.

[0017] 2. Reduce pressure loss and energy consumption: Internal flow channels are usually shorter and more direct than external pipelines, with fewer bends, which can effectively reduce oil flow resistance and pressure loss, thereby reducing system energy consumption.

[0018] 3. Improve system response speed: The shortened oil circuit (especially the control oil circuit and return oil circuit) reduces the oil compression volume effect, which helps to improve the dynamic response speed and control accuracy of the system.

[0019] When an integrated valve block is provided, the following further advantages are available:

[0020] 1. By further adding an integrated valve block, internal oil passages, valve block connection ports, and valve block mating interfaces are set on the integrated valve block. The valve block mating interface connects to the control valve connection port for a sealed connection, and the valve block connection port enables connection to external oil passages. This allows for the connection of more complex control valve structures to external oil passages, saving space and optimizing the layout: fully utilizing the internal space of the oil tank to accommodate the control valve and integrated valve block, achieving a highly compact design, which is particularly beneficial for space-constrained equipment. Placing the precision control valve inside the oil tank or in a sealed integrated structure provides better dust and impact protection, as well as a certain degree of environmental protection, such as better moisture and splash protection.

[0021] 2. Improved heat dissipation and oil management: The heat generated during the operation of the control valve can be directly absorbed and diffused by the large volume of oil in the tank (especially when the valve assembly is partially immersed in the oil), which helps to balance the system's thermal balance. At the same time, as the oil processing center, the integrated valve block in the tank helps to optimize the internal oil flow path design, promoting the sedimentation of impurities and the separation of air bubbles. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the integrated hydraulic oil tank structure of this utility model.

[0023] Figure label:

[0024] 1-Fuel tank air filter; 2-Fuel tank level gauge; 3-Fuel tank suction port; 4-Fuel tank side plate; 5-Control valve; 6-Threaded cartridge valve; 7-Integrated valve block; 8-Fuel tank bottom plate; 9-Fuel tank top plate; 10-Valve block connection port one; 11-Valve block connection port two; 12-Valve block connection port three; 13-Valve block connection port four; 14-Window; 15-Return port. Detailed Implementation

[0025] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not limiting, and should not be used to limit the protection scope of the present invention.

[0026] This utility model discloses an integrated hydraulic oil tank, comprising an oil tank and a hydraulic control valve 5 (hereinafter referred to as the control valve). The oil tank includes a side plate 4, a bottom plate 8, and a top plate 9. The side plate is located between the bottom plate and the top plate, and the side plate is sealed and fixedly connected to the bottom and top plates to form a closed oil tank body. The control valve 5 is located inside the oil tank body. The control valve 5 has at least two control valve connection ports connected to its valve core cavity, which serve as the control valve inlet and outlet, respectively. At least one oil tank connection port is provided on the oil tank body, and the control valve inlet and outlet are sealed and connected to the corresponding oil tank connection ports. Alternatively, an oil tank window 14 is provided on the oil tank body, and the side surfaces of the control valve 5 with the control valve inlet and outlet are sealed and blocked from the corresponding oil tank window, thereby exposing the control valve inlet and outlet for connection to external oil circuits. The surface of the control valve with the connection port is the control valve connection surface. The control valve has an internal flow channel that communicates with the valve core cavity.

[0027] A better design is to use a stacked control valve for control valve 5, and also to install an integrated valve block 7 inside the oil tank. The integrated valve block 7 and the stacked control valve are stacked together. They are fixed together by bolts, welding, or adhesive. The integrated valve block 7 serves as a connection device between the control valve and the external oil passage located outside the oil tank. Both the oil inlet and outlet of the control valve are sealed and connected to the external oil passage located outside the oil tank through the internal oil passage on the integrated valve block. At least two valve block interfaces are provided on the side surface of the integrated valve block for sealing and communicating with the control valve connection port. These are valve block interface one (not shown in the figure) and valve block interface two (not shown in the figure). Both valve block interface one and valve block interface two are connected to internal oil passages. Valve block interface one is sealed and communicated with the control valve inlet, and valve block interface two is sealed and communicated with the control valve outlet. The surface of the integrated valve block where the valve block interfaces are located is called the valve block mating surface. On the surfaces of the valve block other than the valve block mating surface, there are valve block connection ports, such as valve block connection port one 10 and valve block connection port two 11. Valve block connection port one 10 is connected to valve block interface one through an internal oil passage, and valve block connection port two 11 is connected to valve block interface two through an internal oil passage. Both valve block connection ports one 10 and valve block connection port two 11 are used to connect to external oil passages. The surface of the integrated valve block where the valve block connection ports are located is called the valve block connection surface. Ideally, both valve block connection port one and valve block connection port two are located on the same valve block connection surface of the integrated valve block and are positioned opposite the window on the oil tank body. Both valve block mating interfaces one and two are located on the same valve block mating surface. This allows for a direct, face-to-face sealing connection between the integrated valve block and the control valve, eliminating the need for oil pipe connections. This results in a good seal, eliminates the need for extra oil pipes, and shortens the connection distance between the control valve and the external oil passages, improving the hydraulic system response time. The number of control valve connection ports is the same as the number of valve block mating interfaces, and each is mated and sealed. Each valve block mating interface is connected to its corresponding control valve connection port via an internal oil passage. Other valve block connection ports can also be provided on the valve block connection surface, such as valve block connection port three (12) and valve block connection port four (13). At least one threaded interface can also be provided on the valve block connection surface of the integrated valve block, connecting to the internal oil passage. A threaded cartridge valve 6 is installed on the threaded interface, and the threaded cartridge valve 6 is connected to the internal oil passage. Valve block connection ports one, two, three, and four are all used, according to design requirements, to connect to the power element's pressure port, return port, actuator's inlet port, and actuator's outlet port, respectively. Threaded cartridge valves can be safety valves, pressure control valves, etc. When a relief valve is installed on the control valve, the relief valve is connected to the internal cavity of the oil tank.

[0028] Ideally, all fuel tank connection ports should be located on the fuel tank bottom plate 8. A fuel tank suction port 3 is provided on the fuel tank body, welded or bonded to the fuel tank bottom plate 8 and communicating with the inner cavity of the fuel tank, used to connect to the oil pump in the external oil passage. A fuel tank level gauge 2 is installed inside the fuel tank, mounted on the fuel tank side plate 4, for observing the fuel level. Ideally, the fuel tank inlet is located on the fuel tank top plate 9, and a fuel tank air filter 1 is installed at the fuel tank inlet, mounted on the outer surface of the fuel tank top plate 9, for refueling and filtering impurities in the air. Ideally, the integrated valve block is fixedly connected to the fuel tank bottom plate, and the control valve is stacked on the upper surface of the integrated valve block, the two being fixed together by bolts.

[0029] In a preferred embodiment, the control valve connection ports on the control valve, which are used to mate with the corresponding interfaces on the integrated valve block, are all located on the control valve connection surface. Similarly, the valve block interfaces on the integrated valve block, which are used to mate with the interfaces of the control valve, are also located on the same mating surface of the integrated control valve. This allows for direct mating connection between the integrated valve block and the control valve. It is preferable to provide seals at the interfaces or seals at the two mating points of the integrated valve and the control valve to ensure a leak-proof seal between the corresponding interfaces. Ideally, the valve block connection ports on the integrated valve block used to connect to external oil passages are located on the same surface, opposite to the windows on the oil tank, allowing for centralized connection and easier operation. The valve block mating surface where the valve block interface is located and the valve block connection surface where the valve port connection port is located are positioned opposite each other, resulting in shorter internal oil passages and easier connection to external oil passages.

[0030] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An integrated hydraulic oil tank comprising an oil tank and a control valve, characterized by: The control valve is located inside the oil tank. At least two control valve connection ports are provided on the control valve connection surface. The two control valve connection ports serve as the control valve inlet and the control valve outlet. The control valve inlet and the control valve outlet are respectively connected to the valve core cavity of the control valve. The control valve connection ports are sealed to the external oil passage through the oil tank connection port provided on the oil tank body, or the control valve connection surface seals the oil tank window. The control valve connection ports are set opposite to the oil tank window or inside the oil tank window. The control valve connection ports are used to connect to the external oil circuit.

2. An integrated hydraulic oil tank as claimed in claim 1, characterized in that: It also includes an integrated valve block, on which a valve block interface is provided on the mating surface. The integrated valve block interface is sealed and connected to the control valve connection port. The connecting surface of the integrated valve block is provided with a valve block connection port. The valve block interface and the valve block connection port are connected through an internal oil passage provided in the integrated valve block. The valve block interface is sealed and connected to the corresponding control valve connection port. The valve block connection port is sealed and connected to the external oil passage through an oil tank connection port provided on the oil tank body. Alternatively, the integrated valve connecting surface can seal and block the oil tank window. The integrated valve connection port is opposite to or located inside the oil tank window. The control valve connection port is connected to the external oil circuit through the valve block connection port.

3. An integrated hydraulic oil tank as claimed in claim 1, characterized in that: The oil tank suction port is fixedly and sealed to the bottom plate of the oil tank. Its oil inlet side is used to connect to the external oil passage, and its oil outlet side is connected to the inner cavity of the oil tank.

4. An integrated hydraulic oil tank as claimed in claim 1, characterized in that: The oil tank level gauge is installed on the side plate of the oil tank and is used to observe the liquid level in the oil tank.

5. An integrated hydraulic oil tank as claimed in claim 1, characterized in that: The top plate of the fuel tank is provided with a fuel tank inlet. The fuel tank air filter is installed at the fuel tank inlet and fixedly connected to the top plate of the fuel tank. It is used for refueling the fuel tank and filtering impurities in the air.

6. An integrated hydraulic oil tank as claimed in claim 2, characterized in that: The control valve and the integrated valve block are stacked and fixedly connected, and the two are fixed and sealed together by bolts.

7. An integrated hydraulic oil tank as claimed in claim 2, characterized in that: All valve block connection ports are located on the same valve block connection surface, all valve block mating interfaces are located on the same valve block mating surface, and the control valve connection port is located on the same control valve connection surface.

8. An integrated hydraulic oil tank as claimed in claim 2, characterized in that: A threaded hole is provided on the valve block connection surface. The threaded hole communicates with the internal oil passage. The threaded cartridge valve is installed in the threaded hole. The threaded cartridge valve and each valve block connection port are located on the same valve block connection surface.

9. An integrated hydraulic oil tank as claimed in claim 2, characterized in that: The external oil passage is equipped with power components and actuators, and each valve block connection port is used to seal and connect with the oil pressure port of the power component, the oil inlet of the actuator, and the oil outlet of the power component.

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