Oiling and cleaning device and oiling and cleaning method

Abstract

The invention belongs to the technical field of hydraulic systems, and relates to an oiling and cleaning device and an oiling and cleaning method.The device comprises an oil tank, a two-position three-way valve, a hydraulic oil filter A, an electric pump, a cleaning and filtering assembly and a three-position six-way valve; a port A1 of the two-position three-way valve is connected with the oil tank, a port A2 is connected with a port B1 of the three-position six-way valve, a port A3 is sequentially connected with the oil filter A, the electric pump and the cleaning and filtering assembly, and the outlet end of the cleaning and filtering assembly is connected with a port B2 of the three-position six-way valve. A port S I and a port P1 of the three-position six-way valve are connected with a system I; and the S2 and P2 ports are connected with the system II.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic systems, and in particular relates to a refueling and cleaning device and a refueling and cleaning method. Background Art

[0002] Currently, all large and medium-sized aircraft (fixed-wing aircraft and helicopters) are equipped with more than two independent hydraulic systems, and each hydraulic system usually has an independent hydraulic oil tank. As the system runs longer, the amount of oil in the hydraulic oil tank gradually decreases, and the amount of pollutants in the hydraulic system gradually increases. In order to ensure the normal operation of the hydraulic system, the hydraulic system needs to be refueled and cleaned.

[0003] At present, in order to facilitate the maintenance of helicopter hydraulic systems, helicopter hydraulic systems are generally equipped with an onboard refueling hand pump, which can manually refuel the oil tanks of multiple hydraulic systems on the aircraft. This refueling hand pump refueling method is inconvenient for maintenance on the one hand, and on the other hand, the refueling hand pump cannot clean the hydraulic system. When cleaning the system, it is necessary to use ground support equipment such as hydraulic oil trucks, which is not convenient for hydraulic system maintenance in the field where there is a lack of ground support equipment.

[0004] Therefore, how to simply and efficiently take into account the refueling and cleaning of the aircraft hydraulic system is a problem that needs to be solved. Summary of the invention

[0005] Purpose of the invention: To solve the problem of pressure refueling and cleaning of hydraulic systems under field conditions, while taking into account the performance and indicators such as the safety of the main hydraulic system, the weight of the refueling / filtration system, and the human-machine efficiency of pressure refueling, a refueling and cleaning device and control method are proposed.

[0006] Technical Solution

[0007] A refueling and cleaning device, comprising: a fuel tank, a two-position three-way valve, an oil filter A, an electric pump, a cleaning filter assembly, and a three-position six-way valve;

[0008] The A1 port of the two-position three-way valve is connected to the oil tank, the A2 port is connected to the B1 port of the three-position six-way valve, the A3 port is connected to the oil filter A, the electric pump and the cleaning filter assembly in sequence, and the outlet end of the cleaning filter assembly is connected to the B2 port of the three-position six-way valve;

[0009] The SI and P1 ports of the three-position six-way valve are connected to system one; the S2 and P2 ports are connected to system two.

[0010] Furthermore, the device also includes: a bypass valve, one end of which is connected to the outlet of the cleaning filter assembly, and the other end of which is connected to the oil tank through an oil return pipeline.

[0011] Furthermore, the device also includes: a first one-way valve, which is connected in parallel with the cleaning filter assembly, and the direction of the first one-way valve is the same as the flow direction of the fluid in the cleaning filter assembly; the first one-way valve opens when the flow resistance of the cleaning filter assembly is too large.

[0012] Furthermore, the device also includes: a safety valve; the safety valve inlet is connected to the outlet of the cleaning filter assembly, and the safety valve outlet is connected to the oil return pipeline.

[0013] Further, the cleaning filter assembly includes four oil filters;

[0014] The four oil filters form two parallel filter channels, and two oil filters are connected in series in each channel.

[0015] Furthermore, the device also includes: a second one-way valve, which is connected to the oil filter A in parallel.

[0016] Further, system one is a system to be refueled or a system to be cleaned; system two is a system to be refueled or a system to be cleaned.

[0017] A refueling method for a refueling and cleaning device, comprising the following steps:

[0018] Control the A1 and A3 ports of the two-position three-way valve to be connected, and the safety valve is at the opening pressure PS1;

[0019] The electric pump sucks oil from the oil tank and outputs oil at a pressure of P1.

[0020] Control the three-position six-way valve to the left or right position to refuel system one or system two;

[0021] When the three-position six-way valve is controlled to the middle position, the oil output by the electric pump flows back to the oil tank through the safety valve.

[0022] A method for cleaning a refueling and cleaning device comprises the following steps:

[0023] Control the A2 and A3 ports of the two-position three-way valve to be connected, and the safety valve is at the opening pressure PS2;

[0024] Control the three-position six-way valve to the left or right position, and the electric pump draws oil from system one or system two through the three-position six-way valve, pressurizes the oil to pressure P2, and returns to system one or system two through the three-position six-way valve after cleaning the filter assembly.

[0025] In summary, the beneficial effects of the present invention are as follows:

[0026] The present invention relates to a hydraulic system refueling and cleaning device and a control method, which adopts a two-stage pressure output electric pump, and the pump can be used for refueling / system cleaning, thus saving on-board installed controls and reducing system weight; a selection valve is used to adjust the opening pressure of the safety valve to achieve a two-stage opening pressure of the safety valve, thereby avoiding excessive output pressure of the electric pump during pressure refueling and system cleaning; the electric pump start-stop logic design and bypass valve design greatly improve the system safety and avoid non-command operation of the electric pump; a light-weight airborne oil filtration hydraulic system is provided for the helicopter, which takes into account the safety of the main hydraulic system, does not rely on external hydraulic support equipment for pressure refueling and filtration cleaning, and has a light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of a refueling and cleaning device;

[0028] 1. Three-position six-way selector valve; 2. Two-position three-way selector valve; 3. Hydraulic oil tank; 4. Check valve; 5. Hydraulic oil filter; 6. Electric pump; 7-8. Check valve; 9-12. Hydraulic oil filter; 13. Safety valve; 14. Bypass valve. DETAILED DESCRIPTION

[0029] Embodiment 1

[0030] An airborne hydraulic refueling and cleaning device integrates a three-position six-way selection valve, a two-position three-way selection valve, a hydraulic oil tank, a one-way valve, a hydraulic oil filter, an electric pump (including a pressure switch), a safety valve, and a bypass valve. It can provide the aircraft hydraulic system with pressure refueling and system cleaning two-stage pressure hydraulic energy, pressure refueling control, system cleaning control, refueling / cleaning status indication, and prevention of accidental start-up in the air.

[0031] The present invention relates to an onboard hydraulic system refueling and cleaning device, the principle of which is as follows: Figure 1As shown. The oil outlet of the three-position six-way selector valve 1 is connected to the cleaning port of the two-position three-way selector valve 2 through a pipeline, the oil inlet is connected to the oil inlet of the bypass valve 14 through a pipeline, the S1 port is connected to the oil tank of the aircraft #1 hydraulic system, the P1 port is connected to the pressure pipeline of the aircraft #1 hydraulic system, the S2 port is connected to the oil tank of the aircraft #2 hydraulic system, and the P2 port is connected to the pressure pipeline of the aircraft #2 hydraulic system; the refueling port of the two-position three-way selector valve 2 is connected to the oil suction port of the hydraulic oil tank 3 through a pipeline, and the oil outlet of the two-position three-way selector valve 2 is respectively connected to the oil inlet of the check valve 4 and the oil inlet of the hydraulic oil filter 5 through a pipeline; the oil return port of the hydraulic oil tank 3 is respectively connected to the oil outlet of the safety valve 13 and the oil outlet of the bypass valve 14 through a pipeline. ; The oil outlet of the one-way valve 4 and the oil outlet of the hydraulic oil filter 5 are merged and connected to the oil suction port of the electric pump 6 through a pipeline, and the oil outlet of the electric pump 6 is connected to the oil inlet of the one-way valve 7 through a pipeline; the oil outlet of the one-way valve 7 is connected to the oil inlet of the one-way valve 8, the oil inlet of the hydraulic oil filter 9, and the oil inlet of the hydraulic oil filter 10 through a pipeline respectively; the oil outlet of the hydraulic oil filter 9 is connected to the oil inlet of the hydraulic oil filter 11, and the oil outlet of the hydraulic oil filter 10 is connected to the oil inlet of the hydraulic oil filter 12. The oil outlet of the one-way valve 8 is merged with the oil outlet of the hydraulic oil filter 11 and the oil outlet of the hydraulic oil filter 12 and then connected to the oil inlet of the safety valve 13 through a pipeline, and the oil inlet of the safety valve 13 is connected to the oil inlet of the bypass valve 14 through a pipeline.

[0032] like Figure 1As shown, the valve core of the three-position six-way selector valve 1 has three positions, and the system can be selected for pressure refueling / cleaning. The three-position six-way selector valve 1 has an integrated pressure sensor to monitor the internal pressure of the device in real time; when the valve core is in the "middle position" default position, the oil outlet of the three-position six-way selector valve 1 is disconnected from the S1 and S2 ports, and the oil inlet of the three-position six-way selector valve 1 is disconnected from the P1 and P2 ports; when the valve core is in the "left position", the oil outlet of the three-position six-way selector valve 1 is connected to the S1 port, the oil outlet of the three-position six-way selector valve 1 is disconnected from the S2 port, the oil inlet of the three-position six-way selector valve 1 is connected to the P1 port, and the oil inlet of the three-position six-way selector valve 1 is disconnected from the P2 port; when the valve core is in the "right position", the oil outlet of the three-position six-way selector valve 1 is connected to the S2 port, the oil outlet of the three-position six-way selector valve 1 is disconnected from the S1 port, the oil inlet of the three-position six-way selector valve 1 is connected to the P2 port, and the oil inlet of the three-position six-way selector valve 1 is disconnected from the P1 port. The valve core of the two-position three-way selector valve 2 has two positions. When the two-position three-way selector valve 2 is in the default position of "left position", the refueling port of the two-position three-way selector valve 2 is connected to the oil outlet, the cleaning port of the two-position three-way selector valve 2 is disconnected from the oil outlet, and the electric pump 6 sucks oil from the hydraulic oil tank 3; when the two-position three-way selector valve 2 is in the "right position", the cleaning port of the two-position three-way selector valve 2 is connected to the oil outlet, and the refueling port of the two-position three-way selector valve 2 is disconnected from the oil outlet. The open non-pressurized hydraulic oil tank 3 contains an air filter to provide the hydraulic oil required for pressure refueling, and the air filter prevents pollutants in the air from entering the hydraulic oil tank. The hydraulic oil filter 5 filters pollutants in the oil; the one-way valve 4 opens when the flow resistance of the hydraulic oil filter 5 is too large; the start and stop of the electric pump 6 is controlled by the rotor speed and wheel load signal, and can output hydraulic oil with pressures of P1 and P2 respectively. The one-way valve 7 prevents the reverse flow of oil; the hydraulic oil filter 9-12 filters the hydraulic oil output by the electric pump; the one-way valve 8 opens when the flow resistance of the hydraulic oil filter 9-12 is too large; the safety valve 13 prevents the hydraulic pump output pressure from being too high, and the safety valve 13 has two levels of opening pressure: PS1 and PS2. The valve core of the bypass valve 14 has two positions. When the rotor speed and wheel load signal do not meet the set value, it is automatically located in the "left position"; when the bypass valve 14 is in the "left position" default position, the oil inlet and oil outlet of the bypass valve 14 are connected, and the electric pump is depressurized; when the bypass valve 14 is in the "right position" default position, the oil inlet and oil outlet of the bypass valve 14 are disconnected, and the electric pump can be started to build pressure.

[0033] When the valve core of the two-position three-way selector valve 2 is in the "left position", the opening pressure of the safety valve 13 is PS1, and the output pressure of the electric pump 6 is P1. When the valve core of the two-position three-way selector valve 2 is in the "right position", the opening pressure of the safety valve 13 is PS2, and the output pressure of the electric pump 6 is P2.

[0034] When the pressure refueling function is executed, the bypass valve 14 is placed in the "right position" and the two-position three-way selector valve 2 is placed in the "left position". At this time, the opening pressure of the safety valve 13 is PS1, and the electric pump 6 will suck oil from the hydraulic oil tank 3. The output pressure of the electric pump 6 is P1, and the hydraulic oil passes through the one-way valve 7 and the hydraulic oil filter 9-12 and then enters the oil inlet of the three-position six-way selector valve 1.

[0035] a. If the 3-position 6-way selector valve 1 is set to the "left position", the hydraulic oil output by the electric pump will enter the aircraft #1 hydraulic system pressure pipeline through the P1 port of the 3-position 6-way selector valve 1 and then reach the aircraft #1 hydraulic system oil tank, completing the refueling of the #1 hydraulic system oil tank;

[0036] b. If the three-position six-way selector valve 1 is set to the "right position", the hydraulic oil output by the electric pump will enter the aircraft #2 hydraulic system pressure pipeline through the P2 port of the three-position six-way selector valve 1 and then reach the aircraft #2 hydraulic system oil tank, completing the refueling of the #2 hydraulic system oil tank;

[0037] c. If the three-position six-way selector valve 1 is placed in the "neutral position", the oil output by the electric pump 6 will overflow into the hydraulic oil tank 3 through the safety valve 13.

[0038] When executing the system cleaning function, the bypass valve 14 is placed in the "right position" and the two-position three-way selector valve 2 is placed in the "right position". At this time, the opening pressure of the safety valve 13 is PS2, and the electric pump 6 will suck oil from the aircraft hydraulic oil tank through the three-position six-way selector valve 1. The output pressure of the electric pump 6 is P2, and the hydraulic oil passes through the one-way valve 7 and the hydraulic oil filters 9-12 and then enters the oil inlet of the three-position six-way selector valve 1.

[0039] a. If the three-position six-way selector valve 1 is set to the "left position", the electric pump 6 will suck oil from the aircraft #1 hydraulic system tank through the three-position six-way selector valve 1, and the hydraulic oil output by the electric pump will enter the aircraft #1 hydraulic system pressure pipeline through the P1 port of the three-position six-way selector valve 1 and then reach the aircraft #1 hydraulic system tank, and the #1 hydraulic system will circulate and filter the primary oil;

[0040] b. If the three-position six-way selector valve 1 is set to the "right position", the electric pump 6 will suck oil from the aircraft #2 hydraulic system tank through the three-position six-way selector valve 1, and the hydraulic oil output by the electric pump will enter the aircraft #2 hydraulic system pressure pipeline through the P2 port of the three-position six-way selector valve 1 and then reach the aircraft #2 hydraulic system tank, and the #2 hydraulic system will circulate and filter the primary oil;

[0041] c. If the three-position six-way selector valve 1 is placed in the "neutral position", the oil outlet of the three-position six-way selector valve 1 is disconnected from the S1 and S2 ports, and the oil inlet of the three-position six-way selector valve 1 is disconnected from the P1 and P2 ports. The electric pump 6 cannot draw oil from the aircraft hydraulic oil tank through the three-position six-way selector valve 1 to build up pressure.

[0042] When the refueling or cleaning function is not performed, the two-position three-way selector valve 2 is placed in the "left position" and the bypass valve 14 is placed in the "left position"; at this time, the opening pressure of the safety valve 13 is PS1, and the electric pump is depressurized.

[0043] When the two-position three-way selector valve 2 is not placed in the "left position" after refueling or cleaning, because the rotor speed and wheel load signals in the air do not meet the regulations, the valve core of the bypass valve 14 automatically returns to the "left position" default position, keeping the electric pump outlet connected to the return oil. The system is pressure-free at this time. Even if the valve core of the three-position six-way selector valve 1 is not in the "middle position", the system oil is not cross-linked with the aircraft hydraulic system, and does not affect the safety of the onboard hydraulic system.

[0044] 1. Design an onboard hydraulic refueling and cleaning device that can pressure refuel and filter and clean the aircraft hydraulic system without relying on external hydraulic equipment;

[0045] 2. Design an electric pump with an internal integrated pressure switch to achieve dual-stage pressure output for pressure refueling / system cleaning, one pump for dual purposes, saving on-board installed controls and reducing system weight;

[0046] 3. Design a control logic that uses rotor speed and wheel load signals to control the start and stop of the electric pump to prevent the electric pump from starting while flying in the air;

[0047] 4. Design a two-stage opening pressure safety valve that can use a selector valve to adjust the opening pressure to avoid excessive output pressure of the electric pump during pressure refueling and system cleaning;

[0048] 5. Design a bypass valve that can be controlled by rotor speed and wheel load signal, and a bypass valve with position lock to ensure that the electric pump outlet is connected to return oil when the aircraft is flying or not performing refueling / cleaning functions;

[0049] 6. Design a three-position six-way selector valve with position locking that can be electrically or mechanically controlled to achieve the selection of the hydraulic system on the pressure refueling / cleaning machine;

[0050] 7. Design a two-position three-way selector valve with position locking that can be electrically or mechanically controlled to realize the pressure refueling / system cleaning function selection.

[0051] Embodiment 2

[0052] Basically the same as the first embodiment, the S1, P1, S2, and P2 ports of the three-position six-way valve can also be connected to the fuel system for refueling the fuel system and for recycling, cleaning, and reusing the oil.

Claims

1. A refueling and cleaning device, characterized in that: The device includes: Oil tank, two-position three-way valve, oil filter A, electric pump, cleaning filter assembly, three-position six-way valve; The A1 port of the two-position three-way valve is connected to the oil tank, the A2 port is connected to the B1 port of the three-position six-way valve, the A3 port is connected to the oil filter A, the electric pump and the cleaning filter assembly in sequence, and the outlet end of the cleaning filter assembly is connected to the B2 port of the three-position six-way valve; The SI and P1 ports of the three-position six-way valve are connected to system one; the S2 and P2 ports are connected to system two.

2. The device according to claim 1, characterized in that: The device also includes a bypass valve, one end of which is connected to the outlet of the cleaning filter assembly, and the other end of which is connected to the oil tank through an oil return pipeline.

3. The device according to claim 2, characterized in that: The device also includes: a first one-way valve, which is connected in parallel with the cleaning filter assembly, and the direction of the first one-way valve is the same as the flow direction of the fluid in the cleaning filter assembly; the first one-way valve opens when the flow resistance of the cleaning filter assembly is too large.

4. The device according to claim 3, characterized in that: The device also includes: a safety valve; the safety valve inlet is connected to the outlet of the cleaning filter assembly, and the safety valve outlet is connected to the oil return pipeline.

5. The device according to claim 1, characterized in that: The cleaning filter assembly includes four oil filters; The four oil filters form two parallel filter channels, and two oil filters are connected in series in each channel.

6. The device according to claim 1, characterized in that: The device also includes: a second one-way valve, which is connected to the oil filter A in parallel.

7. The device according to claim 1, characterized in that: System one is a system to be refueled or a system to be cleaned; system two is a system to be refueled or a system to be cleaned.

8. A refueling method for a refueling and cleaning device, implemented based on any of the above-mentioned devices, characterized in that: The following steps are involved: Control the A1 and A3 ports of the two-position three-way valve to be connected, and the safety valve is at the opening pressure PS1; The electric pump sucks oil from the oil tank and outputs oil at a pressure of P1. Control the three-position six-way valve to the left or right position to refuel system one or system two; When the three-position six-way valve is controlled to the middle position, the oil output by the electric pump flows back to the oil tank through the safety valve.

9. A method for cleaning a refueling and cleaning device, implemented based on any of the above-mentioned devices, characterized in that: The following steps are involved: Control the A2 and A3 ports of the two-position three-way valve to be connected, and the safety valve is at the opening pressure PS2; Control the three-position six-way valve to the left or right position, and the electric pump draws oil from system one or system two through the three-position six-way valve, pressurizes the oil to pressure P2, and returns to system one or system two through the three-position six-way valve after cleaning the filter assembly.

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