CN2642673Y - Pollution control device for brake system reverse flow - Google Patents

Abstract

The utility model relates to a pollution control device for brake system reverse flow, aiming at preventing pollution to servo valves caused by the brake system reverse flow. The structure is that a gate is positioned on a pipe between the outlet of a servo valve and a brake device, so as to separate the pipe shared by braking and oil return; the oil return pipe is provided with an oil filter. The gate is provided with two channels, one of which flows from a shared pipe nozzle to a brake pipe nozzle channel and the other flows from the oil return pipe to the shared pipe nozzle channel; and only one of the channels can be opened during operation. The oil filter makes sure to filter pollutants in the oil returning to the servo valve, the filtering technical indicators of which depend on requirements of the servo valve and the system.

Description

The reverse earial drainage of brake system pollutes control

Technical field the utility model relates to airplane brake system and pollutes control, specifically is the pollution control of the reverse earial drainage of aircraft electronic anti-skid braking system.

Background technology electronic anti-skid braking system and disc brake device are used widely on present generation aircraft.But the electrohydraulic servo valve in the electronic anti-skid braking system is subject to the oil contaminant infringement, makes serviceability deterioration even malfunctioning, finally influences the safe in utilization of aircraft.Have been found that disc brake device is a potential pollution source.In the process of getting off the brakes, the fluid in the brake gear comes oil pipe line oppositely to flow back to the servovalve pressure release by brake.Existing brake system does not have pollution control device on the pipeline between servovalve outlet and the brake gear.Along with increasing of access times, oppositely earial drainage will increase the pollution hazard that servovalve causes, and become the hidden danger of electronic anti-skid braking system reliability service.The possible measure that solves reverse earial drainage pollution is directly to set up oil-filtering apparatus on the servovalve export pipeline, and oil-filtering apparatus perhaps is set on servovalve.But, oil-filtering apparatus need be installed on the pipeline of fluid nonreturn flow could normal operation, and servovalve is a brake fuel feeding and the shared pipeline of oil return that gets off the brakes to brake gear, the fluid two-way flow makes the oil-filtering apparatus cisco unity malfunction under the prior art, thereby preceding a kind of measure is infeasible.Servovalve itself is a very complicated high-accuracy device, if oil-filtering apparatus is set on servovalve again, will enlarge markedly its manufacture difficulty and cost, and the more important thing is that the effect that control is polluted can be not fine, thereby a kind of measure in back also is less feasible.

The summary of the invention the purpose of this utility model is to solve the pollution problem that the reverse earial drainage of electronic anti-skid braking system brings to servovalve, improves the reliability of service of electronic anti-skid braking system.Another purpose of the present utility model is to pollute control device for the outfield provides the reverse earial drainage of brake system, improves working service.

The utility model technical solution is that the pipeline that servovalve exports to brake gear is divided into two, and one is brake line, and one is oil return line, like this, on oil return line oil-filtering apparatus can be installed, and implements control thereby reverse earial drainage polluted.The utility model comprises a strobe unit and an oil-filtering apparatus, and strobe unit has three adapters to chew: a shared pipe is chewed, and it is connected by conduit with the servovalve outlet, a brake pipe is chewed, it links to each other with brake gear, and an oil return pipe is chewed, and it is connected with oil-filtering apparatus.Oil-filtering apparatus has two adapters to chew, and pipe is chewed (fuel-displaced) and chewed with the oil return pipe of strobe unit and be connected, and a pipe is chewed (oil-feed) and linked to each other with brake gear.Switch if normal braking system and emergency brake system adopt changeover valve to carry out oil circuit, so, the brake pipe of strobe unit is chewed to chew with changeover valve with the oil inlet of oil-filtering apparatus and is linked to each other.Strobe unit has according to the function of hydraulic oil flow to the selector channel.It has two passages, and one is to chew from shared pipe to flow to the passage that brake pipe is chewed, and one is to chew from oil return pipe to flow to the passage that shared pipe is chewed, and these two passages can not be open-minded simultaneously.Oil-filtering apparatus can collect and filtering fluid in pollutants, technical indexs such as its filtering performance and service life are determined according to the requirement of servovalve and system.

Principle of the present utility model is as follows:

The return opening of servovalve is closed in when brake, and the hydraulic oil that comes from servovalve brake outlet enters strobe unit, and the shared pipe of strobe unit is chewed the passage that brake pipe chews and opened under the oil pressure effect, and hydraulic oil leads to brake gear and brakes.At this moment, chewing oil return pipe from the shared pipe of strobe unit chews passage and closes.When getting off the brakes, the servovalve oil inlet is closed, return opening is opened, the brake mouth is linked up pressure release with return opening, the strobe unit oil return pipe is chewed the passage that shared pipe chews and is opened, and chew the pathway closure that shared pipe is chewed from brake pipe, the fluid in the brake gear flows back to the servovalve pressure release through behind the oil-filtering apparatus, thereby removes brake.If the fluid that refluxes is unclean, pollutants will be by the oil-filtering apparatus filtering.

The utility model adopts strobe unit, the pipeline that servovalve is exported between the brake gear is divided into two by one, like this, can on oil return line, install oil-filtering apparatus additional, the fluid that flows to servovalve must be filtered by oil-filtering apparatus, prevent pollutants harm servovalve, thereby improve the reliability of service of electronic anti-skid braking system.Brake and oil return line are independent, and the fluid nonreturn flow guarantees the oil-filtering apparatus reliability service.Adopt oil-filtering apparatus, but ground crew's periodic inspection oil contamination degree is in time changed fluid or washing system, ensure the cleaning of hydraulic efficiency pressure system.Oil-filtering apparatus also provides the contamination monitoring means for the outfield, has improved working service.The antiskid brake performance that oil-filtering apparatus can not damage system is set, and on the contrary, oil-filtering apparatus improves braking efficiency and also can produce a little beneficial effects with the shortening braking distance improving the brake stationarity.

Description of drawings the utility model description of drawings:

Code name explanation among the figure: 1-control capsule, 2-servovalve, 3-strobe unit, 4-oil-filtering apparatus, 5-brake gear.

The specific embodiment is seen accompanying drawing.Servovalve 2 and control capsule 1 electricity consumption wire joint.Servovalve 2 and strobe unit 3, strobe unit 3 and oil-filtering apparatus 4 link to each other with hydraulic pipe between the oil-filtering apparatus 4 and brake gear 5, strobe unit 3 and brake gear 5.Strobe unit 3 shared pipes are chewed 2 brakes of (O) and servovalve and mouthful are linked to each other, and strobe unit 3 brake pipes are chewed (B) and linked to each other with brake gear 5, and strobe unit 3 oil return pipes are chewed (R) and chewed with oil-filtering apparatus 4 oil outlet pipes and link to each other.Oil-filtering apparatus 4 oil inlets are chewed with brake gear 5 and are linked to each other, and oil outlet pipe is chewed and chewed (R) with strobe unit 3 oil return pipes and link to each other.When brake, servovalve 2 return openings are closed, and the hydraulic oil that is come by hydraulic power source leads to strobe unit 3.Strobe unit 3 has two passages, and chew the passage that (O) chew (B) to brake pipe from shared pipe and open this moment, chew (O) from shared pipe and chew (R) to oil return pipe and close, thereby hydraulic oil flow enters brake gear 5 through strobe unit 3 and brakes.When getting off the brakes, servovalve 2 after receiving control command is closed oil-feed port, and return opening is opened, and the brake mouth is linked up with return opening.Strobe unit 3 oil return pipes were chewed the passage that (R) chew (O) to shared pipe and were opened this moment, and chew (B) chews (O) to shared pipe pathway closure from brake pipe, fluid in the brake gear flows back to servovalve 2 oil returns through oil-filtering apparatus 5 and strobe unit 3, makes brake gear 5 remove brake.In the process of getting off the brakes, the fluid that flows back to servovalve 2 filters through oil-filtering apparatus 4.Switch if normal braking system and emergency brake system adopt the changeover valve (not shown) to carry out oil circuit, so, just the brake pipe of strobe unit (3) is chewed (B) and is chewed with changeover valve with the oil inlet of oil-filtering apparatus (4) and link to each other.Hydraulic oil flow is chewed (B) through strobe unit 3 brake pipes and is entered brake gear 5 through changeover valve again and brake during brake; In the process of getting off the brakes, the fluid in the brake gear 5 through changeover valve, after oil-filtering apparatus 4 filters, flow back to servovalve 2 again and release, to remove brake.The reverse earial drainage pollution of brake system is avoided in the existence of oil-filtering apparatus 4, assurance servovalve 2, and strobe unit (3) makes brake and the shared pipeline of oil return be divided into two independent pipelines, guarantees that oil-filtering apparatus 4 normally and effectively moves.

Strobe unit (3) and oil-filtering apparatus 4 can be made two discrete devices, also can make a composite set.

Claims (4)

1. the pollution of the reverse earial drainage of brake system control is characterized in that: on the hydraulic tubing between servovalve outlet and the brake gear strobe unit is arranged, an oil-filtering apparatus is arranged on the hydraulic tubing between strobe unit and the brake gear.

2. the pollution control of the reverse earial drainage of brake system according to claim 1, it is characterized in that: strobe unit has three adapters to chew, one is that shared pipe is chewed, in addition two is respectively that brake pipe is chewed with oil return pipe and chewed, these three pipes are chewed and are formed two passages, article one, be to chew from shared pipe to flow to brake pipe and chew passage, one is to chew from oil return pipe to flow to shared pipe and chew passage, and in service only can have a passage to open.

3. the pollution control of the reverse earial drainage of brake system according to claim 1 is characterized in that: the shared pipe of strobe unit is chewed by conduit and is linked to each other with the servovalve outlet, and brake pipe is chewed with brake gear and linked to each other, and oil return pipe is chewed with oil-filtering apparatus and linked to each other; Oil-filtering apparatus has two adapters to chew, and a pipe is chewed (oil-feed) and linked to each other with brake gear, and another pipe is chewed (fuel-displaced) and chewed with the strobe unit oil return pipe and be connected; If normal braking and emergency brake system adopt changeover valve to switch oil circuit, then the strobe unit brake pipe is chewed to chew with changeover valve with the oil-filtering apparatus oil inlet and is connected, and all the other are constant.

4. the pollution control of the reverse earial drainage of brake system according to claim 1, it is characterized in that: two pipelines are arranged between from the strobe unit to the brake gear, oil-filtering apparatus is installed on the oil return line, determine in the serviceability of oil-filtering apparatus and service life by the requirement of servovalve and system, oil-filtering apparatus can be a self contained system, and also can combine with strobe unit constitutes a device.