阅读说明：本技术 一种增压供油系统 (Pressure boost oil feeding system ) 是由 闫飞 杨琳 张吉胜 李利民 耿会良 于 2020-11-27 设计创作，主要内容包括：本发明提供了一种增压供油系统,包括主油箱、蓄能器、储气装置和副油箱,所述主油箱、蓄能器和储气装置之间相互连通,在所述主油箱与储气装置间的连通管路上设有第一阀门；所述主油箱与副油箱之间分别经第二阀门和补油泵相连通；所述主油箱上接有液压油泵,所述副油箱上设有真空泵。本发明针对工程机械液压系统流量不均匀且执行件数量多的特点,引入一个副油箱,配合蓄能器和储气装置,以较小的容积解决了主油箱内流量不均匀时的油泵吸油困难问题,缓解了主油箱在流量均匀状态下油液中空气含量过高的困扰。(The invention provides a pressurized oil supply system which comprises a main oil tank, an energy accumulator, a gas storage device and an auxiliary oil tank, wherein the main oil tank, the energy accumulator and the gas storage device are communicated with each other; the main oil tank and the auxiliary oil tank are respectively communicated with each other through a second valve and an oil supplementing pump; the main oil tank is connected with a hydraulic oil pump, and the auxiliary oil tank is provided with a vacuum pump. Aiming at the characteristics of uneven flow and large quantity of executing parts of a hydraulic system of the engineering machinery, the auxiliary oil tank is introduced and matched with the energy accumulator and the gas storage device, so that the problem of difficult oil suction of an oil pump when the flow in the main oil tank is uneven is solved by using a smaller volume, and the trouble of overhigh air content in oil liquid when the flow in the main oil tank is even is relieved.)

1. A pressurized oil supply system is characterized by comprising a main oil tank (1), an energy accumulator (2), an air storage device (3) and an auxiliary oil tank (10),

the main oil tank (1), the energy accumulator (2) and the gas storage device (3) are communicated with each other, and a first valve (4) is arranged on a communication pipeline between the main oil tank (1) and the gas storage device (3);

the main oil tank (1) is communicated with the auxiliary oil tank (10) through a second valve (7) and an oil supplementing pump (15);

the hydraulic oil pump 8 is connected to the main oil tank (1), and the vacuum pump (11) is arranged on the auxiliary oil tank (10).

2. A pressurised oil supply system as claimed in claim 1, characterized in that the accumulator (2) is a bladder accumulator, a piston accumulator or a diaphragm accumulator.

3. The pressurization oil supply system according to claim 1 or 2, characterized in that the accumulator (2) is a piston-type accumulator, and comprises a cylinder (22), a piston (21) and a displacement sensor (23) which are arranged in the cylinder (22), wherein one end of the cylinder (22) is communicated with the gas storage device (3), and the other end is communicated with the main oil tank (1).

4. The system for supplying oil under pressure as claimed in claim 1, characterized in that a first level sensor (5) and a first pressure sensor (6) are provided on the main oil tank (1), and a second level sensor (12) and a second pressure sensor (13) are provided on the secondary oil tank (10).

5. The system for supplying pressurized oil according to claim 4, further comprising a control mechanism, wherein the control mechanism is respectively connected with the first liquid level sensor (5), the first pressure sensor (6), the second liquid level sensor (12) and the second pressure sensor (13) and controls the working states of the vacuum pump (11) and the oil supply pump (15) and the opening and closing of the first valve (4) and the second valve (7).

6. -pressurised oil supply system according to claim 1 or 5, characterised in that the first valve (4) and the second valve (7) are both solenoid valves.

7. The system for supplying oil under pressure according to claim 1, wherein a first switch valve (16) for charging and discharging air of the air storage device (3) is further provided on a communication pipeline between the main oil tank (1) and the air storage device (3).

Technical Field

The invention relates to the technical field of hydraulic equipment, in particular to a pressurization oil supply system.

Background

The current supercharged oil tank has been widely used in military industry fields such as boats and ships, aviation, and it has solved the problem of pump oil pumping difficulty with less volume, also solves and the puzzlement that the air content is too high brings with the fluid in the aerospace field through addding the vacuum pump simultaneously, improves the control rigidity. However, the hydraulic system in the aforementioned field is relatively uniform in flow rate and single in actuator, and is not suitable for a hydraulic system having a large number of actuators and non-uniform in flow rate, and therefore, a booster tank has not been widely used in the field of construction machinery.

At present, the damage faults of precision hydraulic parts caused by the oil absorption difficulty phenomenon in engineering machinery are increased, partial designers adopt a mode of connecting an oil tank with an air storage cylinder or a booster pump to realize oil tank pressurization, but the mode cannot reduce the air content in oil, and the floating speed of bubbles in the oil is reduced due to the pressurization effect, so that the volume of the oil tank is not obviously reduced or enlarged.

Disclosure of Invention

In view of the above-mentioned defects, the present invention provides a novel pressurized oil supply system, so as to reduce the air content in the oil while performing the pressurization function.

The invention provides a pressurized oil supply system which comprises a main oil tank, an energy accumulator, a gas storage device and an auxiliary oil tank, wherein the main oil tank, the energy accumulator and the gas storage device are communicated with each other; the main oil tank and the auxiliary oil tank are respectively communicated with each other through a second valve and an oil supplementing pump; the main oil tank is connected with a hydraulic oil pump, and the auxiliary oil tank is provided with a vacuum pump.

Preferably, the accumulator is a bladder accumulator, a piston accumulator or a diaphragm accumulator.

Preferably, the energy accumulator is a piston type energy accumulator and comprises a cylinder barrel, a piston and a displacement sensor, wherein the piston and the displacement sensor are arranged in the cylinder barrel, one end of the cylinder barrel is communicated with the gas storage device, and the other end of the cylinder barrel is communicated with the main oil tank.

Preferably, a first liquid level sensor and a first pressure sensor are arranged on the main oil tank, and a second liquid level sensor and a second pressure sensor are arranged on the auxiliary oil tank.

Preferably, the oil-supplementing pump further comprises a control mechanism, and the control mechanism is respectively connected with the first liquid level sensor, the first pressure sensor, the second liquid level sensor and the second pressure sensor, and controls the working states of the vacuum pump and the oil-supplementing pump, and the opening and closing of the first valve and the second valve.

Preferably, the first valve and the second valve are both solenoid valves.

Preferably, a first switch valve for charging and discharging air of the air storage device is further arranged on a communication pipeline between the main oil tank and the air storage device.

Aiming at the characteristics of uneven flow and large quantity of executing parts of a hydraulic system of the engineering machinery, the auxiliary oil tank is introduced and matched with the energy accumulator and the gas storage device, so that the problem of difficult oil suction of an oil pump when the flow in the main oil tank is uneven is solved by using a smaller volume, and the trouble of overhigh air content in oil liquid when the flow in the main oil tank is even is relieved.

Drawings

FIG. 1 is a schematic illustration of a pressurized oil supply system according to the present invention;

fig. 2 is a schematic structural diagram of an accumulator in one embodiment.

Element number description:

1 Main oil tank

2 energy accumulator

21 piston

22 cylinder

23 displacement sensor

24 gas circuit interface

25 oil way interface

3 gas storage device

4 first valve

5 first level sensor

6 first pressure sensor

7 second valve

8 hydraulic oil pump

9 oil return port of main oil tank

10 auxiliary oil tank

11 vacuum pump

12 second liquid level sensor

13 second pressure sensor

14 oil return port of auxiliary oil tank

15 oil supply pump

16 first switch valve

17 second on-off valve

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1, the present invention provides a pressurized oil supply system, which mainly includes a main oil tank 1, an accumulator 2, an air storage device 3, and a secondary oil tank 10. The main oil tank 1, the energy accumulator 2 and the gas storage device 3 are communicated with each other, a first valve 4 and a first switch valve 16 are arranged on a communication pipeline between the main oil tank 1 and the gas storage device 3, the first switch valve 16 is mainly used for charging and discharging gas of the gas storage device 3, and the first switch valve 16 is kept in a normally closed state when the system works; and a second switch valve 17 is arranged on a communication pipeline between the energy accumulator 2 and the gas storage device 3, and the second switch valve 17 is kept in a normally open state when the system works, so that the system can be disconnected when being maintained, and the safety of the system is ensured. The accumulator 2 is used for absorbing flow fluctuation generated in the working process of the main oil tank 1 and can be a bag type accumulator, a piston type accumulator or a diaphragm type accumulator. In an embodiment of the present invention, as shown in fig. 2, the energy accumulator 2 is a piston type energy accumulator, and includes a cylinder 22, a piston 21 disposed in the cylinder 22, and a displacement sensor 23 mounted on the cylinder 22, wherein one end of the cylinder 22 is communicated with the gas storage device 3 through a gas line interface 24, and the other end is communicated with the main oil tank 1 through an oil line interface 25. The accumulator 2 may be disposed inside the main oil tank 1 or outside the main oil tank 1.

As shown in fig. 1, the main oil tank 1 and the auxiliary oil tank 10 are communicated through two communication pipelines, one of the two communication pipelines is provided with a second valve 7, and the other communication pipeline is provided with an oil replenishing pump 15. The main oil tank 1 is also provided with an access port of a hydraulic oil pump 8 for supplying oil to equipment, a main oil tank oil return port 9, a first liquid level sensor 5 and a first pressure sensor 6, and the auxiliary oil tank 10 is provided with a vacuum pump 11, an auxiliary oil tank oil return port 14, a second liquid level sensor 12 and a second pressure sensor 13.

The pressurizing oil supply system also comprises a control mechanism which can be a PLC (programmable logic controller) and is respectively connected with the first liquid level sensor 5, the first pressure sensor 6, the second liquid level sensor 12 and the second pressure sensor 13 through a signal processing module, and controls the working states of the vacuum pump 11 and the oil supplementing pump 15 and the opening and closing of the first valve 4 and the second valve 7 according to signals of the sensors. The first valve 4 and the second valve 7 are preferably solenoid valves to facilitate automated control.

The working mode of the pressurized oil supply system is as follows:

1) when the main oil tank 1 is in a flow uniform state (i.e. the difference between the oil suction of the hydraulic oil pump 8 and the oil discharge of the main oil tank oil return port 9 is not large or the volume of the stored liquid in the accumulator 2 is larger than the oil required by the corresponding actuator to complete the action):

the main oil tank 1 is filled with oil, the piston 21 of the energy accumulator 2 freely floats to reach pressure balance at two sides, the first valve 4 and the second valve 7 are in a closed state at the moment, and the first liquid level sensor 5 and the first pressure sensor 6 do not send signals;

when the second liquid level sensor 12 detects that the interior of the auxiliary oil tank 10 is at a high liquid level, the oil supplementing pump 15 works to pump oil in the auxiliary oil tank 10 into the main oil tank 1;

when the second liquid level sensor 12 detects that the inside of the auxiliary oil tank 10 is at a low liquid level, the vacuum pump 11 works to pump out gas in oil in the auxiliary oil tank 10 until the second pressure sensor 13 detects that the pressure inside the auxiliary oil tank 10 reaches a preset low pressure value, and the vacuum pump 11 stops working.

2) When the main oil tank 1 is in a non-uniform flow state (namely the oil absorption of the hydraulic oil pump 8 is far greater than the oil output and return amount of the main oil tank oil return port 9 or the liquid storage volume in the energy accumulator 2 is less than the oil required by the corresponding executing part to complete the action:

at this time, the piston 21 of the energy accumulator 2 rapidly slides to the side of the oil line interface 25 due to the overlarge pressure difference between the two sides, the displacement sensor 23 sends a signal, the first valve 4 is opened, and the compressed gas in the gas storage device 3 enters the main oil tank 1 to pressurize the interior of the main oil tank 1, so that the hydraulic oil pump 8 is ensured to normally absorb oil;

when the liquid level in the main oil tank 1 is reduced to a preset low liquid level value, the first liquid level sensor 5 sends a signal, the oil supplementing pump 15 works, the auxiliary oil tank 10 supplements oil for the main oil tank 1 until the auxiliary oil tank 10 is at the low liquid level, and the oil supplementing pump 15 stops working;

when the liquid level in the main oil tank 1 rises, the pressure in the main oil tank 1 rises along with the liquid level, when the first liquid level sensor 5 detects that the liquid level in the main oil tank 1 reaches a preset high liquid level value, a signal is sent out, the first valve 4 is closed, and the main oil tank 2 is disconnected from the gas storage device 3;

when the first pressure sensor 6 detects that the internal pressure of the main oil tank 1 reaches a preset high pressure value, the second valve 7 is opened, and oil in the main oil tank 1 overflows to the auxiliary oil tank 10.

In actual work, a designer selects the capacities of the main oil tank 1, the auxiliary oil tank 10 and the energy accumulator 2 according to needs, wherein the volumes of the storage liquid of the auxiliary oil tank 10 and the volume of the storage liquid of the energy accumulator 2 are equivalent, the auxiliary oil tank 10 can supplement and absorb the flow fluctuation which cannot be absorbed by the energy accumulator 2 when the main oil tank 1 is in a non-uniform flow state, and the auxiliary oil tank is matched with the gas storage device 3 to pressurize the main oil tank 1, so that the phenomenon that the hydraulic oil pump 8 difficultly absorbs oil is avoided; when the main oil tank 1 is in a uniform flow state, the auxiliary oil tank 1 can timely pump gas out of oil according to needs, so that the control rigidity of a hydraulic system is improved, the damage to elements caused by cavitation erosion and cavitation is reduced, the small oil tank volume is facilitated, and the requirement of compact structural design is well met.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.