JPH1133308A - Apparatus for purifying working fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To purify a working fluid in a work site and purify basically even a working fluid existing in a hydraulic cylinder. SOLUTION: A working fluid to be purified and a purified working fluid are gathered and stored in one container. The container can be connected with a hydraulic system through a flexible inlet pipe and a flexible outlet pipe by hydraulic quick couplings 2, 4. A high pressure pump 18 to transport the working fluid to the hydraulic system is installed. A pressure holding valve 6 is installed in a returning route of the working fluid. This working fluid purifying apparatus comprises a unit which can run with wheels.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a centrifugal disc device with at least one centrifugal disc, wherein a central supply device for supplying the working fluid to be purified to the centrifuge disc is arranged, The upper region of the centrifugal disc casing communicates with a vacuum pump for extracting the steam after separating the working fluid from the steam through the working fluid steam separator, and the working fluid separated from the steam is discharged by the pump and centrifuged. The lower region of the separation disk casing forms an accumulation section for accumulating the purified working fluid, and a container for the working fluid to be purified and a container for the purified working fluid are provided. The present invention relates to a working fluid purification device.

[0002]

2. Description of the Related Art Hydraulic fluids used in aircraft hydraulic systems are particularly prone to high concentrations of harmful substances such as water and corrosive substances contained therein. Hazardous substances can harm hydraulic equipment and in particular cause corrosion. Therefore, it is necessary to purify the working fluid (hereinafter simply referred to as oil) at regular time intervals to remove this harmful substance and regenerate it. For this reason, stationary devices are used, in which the oil to be purified has to be removed from the hydraulic system, cleaned and then reloaded into the hydraulic system. An apparatus of this kind is known, for example, from U.S. Pat. No. 4,604,109. The main component of this known device is a centrifugal disc device, by means of which water dissolved in the oil is removed from the oil. At the same time, harmful particles are removed from the oil using a suitable filter. In this known device, the supply of the working liquid to be purified to the centrifuge disc takes place via a central supply. The upper region of the centrifugal disc casing communicates with a vacuum pump for drawing out water vapor, and the lower region of the centrifugal disc casing forms an accumulation section for accumulating purified working fluid. Furthermore, this known device has a container for the working fluid to be purified and a container for the purified working fluid.

A disadvantage of this device is that an appropriate amount of spare oil must always be prepared for replacement so that the aircraft is not parked on the ground for a long time. In this manner, some of the contaminated oil will remain in the hydraulic cylinders of the hydraulic system and will not be purified. In addition, this embodiment is troublesome because the necessary cleaning operation cannot be performed directly by an airplane.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic fluid which can be purified on site, and can basically purify the hydraulic fluid in a hydraulic cylinder. Is to constitute a working fluid purifying device.

[0005]

According to the present invention, in order to solve the above-mentioned problems, the working fluid to be purified and the purified working fluid are collected and housed in one container, and the container is flexible. Can be connected to the hydraulic system by a hydraulic quick coupling through a flexible inlet pipe and a flexible outlet pipe, and a high-pressure pump for transporting the hydraulic fluid into the hydraulic system is provided. It is characterized in that a pressure holding valve is provided in the liquid recirculation path, and that the working fluid purifying device forms a unit that can run on wheels.

The invention has the advantage, inter alia, that the hydraulic fluid is purified in the hydraulic system of the aircraft, so that it is not necessary to prepare a replacement hydraulic fluid.

[0007]

Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a process diagram showing a configuration of a purifying device for purifying a working fluid together with main components of the device. The purification device is connected to the hydraulic system of the aircraft using a flexible inlet tube 1 with a quick coupling 2 and a flexible outlet tube 3 with a quick coupling 4. The internal circulatory system has the following stations in the direction of arrow 5: That is, the pressure holding valve 6, the solenoid valve 7, the inlet shut-off valve 8, the inner inlet pipe 9, the mesh grid 10, the centrifugal disc device 11, the intermediate pipe 12, the transport pump 13, the particle filter 14, A check valve 15, an internal outlet pipe 16, an outlet cutoff valve 17, a high-pressure pump 18, an outlet filter device 19, and an outlet valve 20. The outlet valve 20 is in communication with the flexible outlet tube 3. Further, the purification device comprises a container 21 communicating with the inner inlet and pipe 9 and the inner outlet pipe 16.
have. The container 21 includes a filling connection pipe 22, a discharge valve 23, a filling level indicator 24, and a ventilation unit 25. The lower region of the casing of the centrifugal disc device 11 is used as an accumulation unit for accumulating oil, and has a float valve 26 and a level control switch 27. Air accumulates in the upper region of the casing of the centrifuge disk unit 11. The air is at the intake 28,
It enters the casing via the intake filter 29 and the throttle 30. A vacuum pump 32 driven by a prime mover 31 is used for the required pressure drop. Vacuum pump 3
2 draws air from the casing through the oil mist separator 33. In the illustrated embodiment of the purification device, the prime mover 31 is also used to drive the pump 13. This is shown in the figure by matching the reference numerals 31. A negative pressure measuring device 34 and a lubricator 35 are connected to a pipe that connects the oil mist separator 33 to a vacuum pump. The air flowing out from the pressurized side of the vacuum pump 32 is supplied to an outlet filter group (a water separator 36 having an accumulation container 37 and an outlet filter 38).
Consisting of). Further, a pressure switch 39 is connected to the pressure side of the vacuum pump 32. An inlet thermometer 40 is arranged in front of the mesh grid 10 in the flow direction of the oil. A negative pressure switch 41 and an inlet pressure gauge 42 are connected behind the mesh grid 10 in the flow direction.

When purifying the oil in the hydraulic system of the aircraft with the purifier according to the invention, the purifier is connected to the hydraulic system of the aircraft via quick couplings 2 and 4, and the prime mover 31 is a pump. 13 and 32,
The prime mover 43 drives the high-pressure pump 18, and the prime mover 44 drives the centrifuge disk device 11. Thereby, a substantially constant amount of oil is taken out of the container 21 by the action of the vacuum pump 32, guided through the centrifugal disc device 11, and
6 again returns into the container 21. On the other hand, a certain amount of oil is
Via the quick coupling 2 and the open shut-off valve 8 into the container 21 again. In this way, the oil is supplied from inside the container 21 to the two circulation systems, i.e. the internal circulation system is circulated through the centrifugal disc unit 11 and the external circulation system is circulated through the hydraulic system of the aircraft. I do. The oil is purified in the internal circulation system, the supply of oil from the container 21 to the centrifugal disc 11 being effected by the negative pressure created by the vacuum pump 32. The optimum passage speed for the centrifugal disc device 11 is determined by the mesh grid 10. In this case, the supply amount is
The float valve 26 is adjusted depending on the oil level so that the float valve 26 is opened when the oil level decreases and the float valve 26 is closed when the oil level increases. When the oil supply to the centrifuge disk device 11 is interrupted for some reason and the oil supplied by the vacuum pump 32 to the lower casing area of the centrifuge disk device 11 becomes zero, the level control switch 27 is turned on. Since the operation of is stopped, the safety function is used. The centrifugal disc 11a allows the oil to pass through the upper casing area of the centrifuge disc device 11 in the form of fine drops, so that the water dissolved in the oil evaporates under the negative pressure of the vacuum pump 32, It can be discharged via a vessel 36. The oil guided through the particle filter 14 removes harmful particles in the particle filter 14, and is returned into the container 21 via the pipe 16. With the internal circulation system described above, the contaminated oil is constantly taken out of the container 21 and supplied again as purified oil into the container 21. Thus, the purity of the oil in the container 21 increases as the operation time elapses. The purified oil reaches the hydraulic system of the aircraft via the external circulation system, at the same time the contaminated oil returns into the container 21.

A safety valve 48 is connected to the high-pressure pump 18 in parallel. Thus, the pressure on the pressurizing side of the high-pressure pump 18 is limited to the maximum allowable value. The power of the high-pressure pump 18 is sufficient to supply operating pressure to the aircraft-side hydraulic operating engine, such as a cylinder and prime mover. Thus, the hydraulics in the aircraft can be operated under any operating conditions, so that the oil in the hydraulics in the aircraft can also be changed during the cleaning process. The hydraulic system on the aircraft side has an oil tank with a storage function. Therefore, the bias pressure depending on the oil level in the oil tank is always effective. The pressure on the high pressure side of the oil in the aircraft hydraulic system can be monitored using the inlet manometer 49. A drain valve 50 is provided for removing oil from the external circulation system. The oil supplied to the airplane side hydraulic system via the quick coupling 4 is at a pressure of about 200 bar on the high pressure side, and after returning through the quick coupling 2 it is at the pressure of said bias pressure. is there. A pressure holding valve 6 is provided to maintain this bias pressure about 2 bar above the operating pressure of the cleaning device during the cleaning process. The pressure of the oil entering through the quick coupling 2 can be monitored by a discharge pressure gauge 51. This pressure also acts on the pressure switch 52, which is a component of the safety circuit. A discharge valve 53 is connected in parallel with the pressure holding valve 6 and the solenoid valve 7. Further, a hand pump 54 having a check valve 55 is connected in parallel with the discharge valve 53. With this hand pump 54, the amount of oil in the hydraulic system on the aircraft side can be replenished from the container 21. Conversely, drain the excess oil on the airplane side 53
The oil can be made to flow back into the container 21 by utilizing the action of the bias pressure. If the amount of oil contained in the container 21 exceeds the capacity of the container 21, excess oil can be discharged via the discharge valve 50.

FIG. 2 shows a lower structure 56 and an upper structure 57.
FIG. 3 is a perspective view of a purification device according to the present invention, comprising: The lower structure 56 has two wheels 58, and the upper structure 57 houses the functional unit of FIG. In FIG.
All operating and monitoring elements required to operate the purifier are shown.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram of a working fluid purification device according to the present invention.

FIG. 2 is a perspective view of a working fluid purifying device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Inlet pipe 2, 4 Quick coupling 3 Outlet pipe 6 Pressure holding valve 18
High pressure pump 28 Inlet 29 Inlet filter 30 Restrictor 32 Vacuum pump 33 Oil mist separator 53 Discharge valve
54 Hand Pump 55 Check Valve 56 Lower Structure
57 Superstructure 58 Wheel

Continued on the front page (72) Inventor Manfred Becher Germany 63303 Dry Eich Felipe Rice Straße 6

Claims (6)

[Claims] 1. A centrifugal disc device with at least one centrifugal disc, a central supply device for supplying a hydraulic fluid to be purified to the centrifuge disc is arranged, and an upper part of the centrifuge disc casing. The region communicates with a vacuum pump for sucking steam after separating the working fluid from the steam through the working fluid steam separator, the working fluid separated from the steam is discharged by the pump, and the lower region of the centrifugal disc casing. Forming an accumulation portion for accumulating the purified hydraulic fluid, in a hydraulic fluid purifying device provided with a container for the hydraulic fluid to be purified and a container for the purified hydraulic fluid, The working fluid to be purified and the purified working fluid are collected and stored in one container (21), and the container (21)
Can be connected to a hydraulic system by a hydraulic quick coupling (2, 4) via a flexible inlet pipe (1) and a flexible outlet pipe (3); A high-pressure pump (18) for conveying into the pressure system, a pressure holding valve (6) in the hydraulic fluid return path, and a unit in which the hydraulic fluid purifying device can travel by wheels A working fluid purifying device, comprising: 2. A hand pump (54), provided with a hydraulic system on the aircraft and having a check valve (55) for adjusting the filling level of the hydraulic fluid on the aircraft side, and a hydraulic pump from the aircraft. The hydraulic fluid purifying device according to claim 1, further comprising a discharge valve (53) for discharging the hydraulic fluid. 3. The centrifuge disk casing according to claim 1, wherein the upper region communicates with the intake via a throttle and an intake filter. 3. The working fluid purifying device according to claim 1. 4. The hydraulic fluid purifying device according to claim 1, wherein the vacuum pump is used to convey the hydraulic fluid to be purified. 5. A vacuum pump (32) for conveying a working fluid to be purified and a pump (1) for discharging the working fluid separated by a working fluid steam separator (33).
The working fluid purifying device according to any one of claims 1 to 4, wherein 3) and (3) are commonly driven by a single prime mover (31). 6. A lower structure (56) and an upper structure (57).
The lower structure (56) comprises two wheels (58) and the upper structure (57) comprises all the functional units, operating elements and monitoring elements necessary for operating the hydraulic fluid purification device. The working fluid purifying apparatus according to any one of claims 1 to 5, further comprising: