CA1256000A - Washing apparatus - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

A washing apparatus includes a nozzle having a liquid inlet to which a liquid pump is connected for supplying a wash liquid under pressure thereto. The nozzle has an outlet for discharging the wash liquid. A hollow sweeper member is connected at one end to the outlet of the nozzle for discharging the wash liquid in a jet from the other end. The sweeper member has at the other end a sweeper portion comprising a plurality of flexible strips peripherally mounted around the other end whereby the flexible strips are caused to flutter when the jet of wash liquid is discharged from the other end.

Description

~;256000 WASHING APPARATUS

BAC~GROUND-OF THE INVENTION

Field of the Invention _ This invention relates to a washing apparatus or washer 5 which directs jets of wash liquid against an object to be washed to thereby remove dirt and dust therefrom.
Prior Art One conventional method of washing an object such as a vehicle body has been to continuously apply a wash liquid ~uch as 10 water to the object and rub it by a brush. With this method, dirty portions of the object can be cleaned satisfactorily, but it ~s rather difficult to clean rugged portions of the object by the brush. In addition, this method requires much time and labor, and also ~here is the possibility that the object may be 15 damaged by t~e brushing.
Another conventional washing method has been to inject jets of wash liquid from a nozzle and d~rect them against the object to be washed to thereby blow the dirt and dust away therefrom.
T~is method is advantageous in that the washing can be carried 20 out without causing damage to a surface of the object to be washed because of the use of jets of wash liguid. In addition, rugged portions on the object can be easily cleaned. ~owever, generally, the washinq ability of this method is inferior to that of the first-mentioned conventional method using the brush.
25 Therefore, in order to enhance the washing ability, the jets of washing liquid must be rendered stronq, in which case there is the risk that the surface of the object to be washed is subjected to damage by the increased pressure of the jets of wash liquid.

Therefore, this method is not applicable to those cases where it - ~2S6()00 is not desirable to apply an excessive pressure to the surface of the object to be washed, such as the washing of an airplane body.
SUMMARY OF T E INVENTION
It is therefore an object of this invention to provide a washing apparatus of the type which can efficiently wash an object using a jet of washing fluid without applying an excessive pressure to the surface of the object.
According to the present invention, there is provided a washing apparatus comprising: a liquid pump for supplying wash liquid under pressure; and a washing unit including: a nozzle having a liquid inlet to which said liquid pump is connected to apply the wash liquid thereto, said nozzle having an outlet for discharging the wash liquid, and a hollow sweeper member connected at one end to said outlet of said nozzle for discharging the wash liquid in a jet from the other end, said sweeper member having at said other end a sweeper portion comprising a plurality of flexible strips peripherally mounted around said other end whereby said flexible strips are caused to flutter when the jet of wash liquid is discharged, in which said nozzle further has a chamber, a passageway communicating said liquid inlet with said chamber, a bore communicating said chamber with said outlet and disposed in coaxial relation to said passageway, and an air inlet communicating said chamber with the exterior of said nozzle, said passageway having one end, remote from said liquid inlet, disposed in closely spaced ~:' ~25~i00~

relation to one end of said bore remote from said outlet for drawing the ambient air into said bore via said air inlet when the jet of wash liquid is fed from said passageway to said bore, thereby producing a liquid/air mixture.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side-elevational view of a washing apparatus provided in accordance with the present invention;
FIG. 2 is a cross-sectional view of the washing apparatus;
FIG. 3 i5 a schematic view showing the operation of the washing apparatus;
FIG. 4 is a longitudinal section through a washing unit;
FIG. 5 is a washing unit incorporating a plurality of washing apparatuses; and - 2a -1;~5~000 FIG. 6 is a block diagram of a washing system incorporating the washing unit.

DESCRIPTION-OF THE PREFERRED-EMBODIMENTS OF ~HE INVENTION
A washing apparatus 10 shown in FIG. 1 comprises a nozzle 5 11, a liquid pump 12 for feeding a wash liquid to the nozzle 11, and a sweeper member 13 for directing a jet of wash liquid against a surface of an object to be washed~ As best shown in FIG. 2, the nozzle 11 is of a two-piece construction and comprises a main body 15 and a fitting 16. The main body 15 has 10 a major hollow cylindrical portion 17 and a tubular portion 18 extending perpendicularly from the cylindrical portion 17, the cylindrical portion 17 having an internally-threaded aperture 19 formed therethrough. The cylindrical portion 17 has an aperture 20 disposed in opposed relation to the threaded aperture 19 and 15 communicating with a bore 18a of the tubular portion 18, the aperture 20 tapering toward the tubular portion 18. The free end of the tubular portion lB serves as an outlet 18b for discharging the wash liquid as later described.
The fitting 16 has a cylindrical portion 21, a peripheral 20 flange 22 formed around the cylindrical portion 21 intermediate opposite ends thereof, and a tubular portion 24 extending from one end of the cylindrical portion 21. ~hat part of the cylindrical portion 21 disposed between the flange 22 and the tubular portion 24 is externally-threaded to provide a threaded 25 section 21a which is threaded into the internally-threaded aperture 19 to connect the main body lS and the fitting 16 together. The tubular portion 24 is received within the chamber 17a of the cylindrical portion 17 with its free end disposed in the aperture 20 in closely spaced relation to the bore 18a. The ~256()00 cylindrical portion 21 has a liquid inlet 26 at one end remote from the tubular portion 24 and has a bore 27 formed therein and communicating the inlet 26 with a bore 24a of the tubular portion 24, the bore 27 and the bore 24a jointly providing a continuous 5 straight passageway 28 for the wash liquid. The liquid pump 12 is connected via a pressure-resistant hose 29 to the inlet 26 for feeding the wash liquid under pressure to the nozzle 11. The passageway 28, and the bore 18a of the tubular portion 18 are disposed in coaxial relation to each other.
An open end 31 of the cylindrical portion 17 of the main body 15 serves as an air inlet to which an air compressor 32 (FIG. 3) is connected via a pressure resista~t hose 33. ~he compressed air fed from the compressor 32 to the cha~ber 17a of the cylindrical portion 17 is caused to mix with the wash liquid 15 at the tapered aperture 20 in which the free end of the tubular portion 24 is disposed. This arrangement is similar to an aspirator of the conventional type as hereinafter more fully described.
The sweeper mcmber 13 comprises a tube made of a flexible 20 ~aterial such as a soft synthetic resin and rubber. The flexible tube 13 is secured at one end to the free end of the tubular portion 18 which is reduced in diameter. The flexible tube or sweeper member 13 has a plurality of slits 13a formed in the other end and extending along the length thereof as best shown in 25 FIGS. 2 and 4 to provide a plurality of strips 13b which constitutes a sweeper portion 13c.
The operation of the washing apparatus 10 will now be described. First, the liquid pump 12 is connected to the inlet 26 of the nozzle ll via the hose 29 for feeding the wash liquid 30 under a preselected pressure to the nozzle 11, and the compressor ~60~0 32 is connected to the inlet 31 via the hose 33 for feeding compressed air under a preselected pressure to the nozzle 11.
As described above, the nozzle 11 is of a construction similar to the aspirator, and therefore even if the pressure of the compressed air is lower than the pressure of the wash liquid, the wash liquid discharged in a jet from the free end of the tubular member 24 will not flow toward the inlet 31. Instead, the jet of wash liquid draws the compressed air through the tapered aperture 20 to form a mixture of them, and this liquid/
air mixture is fed through the bore 18a of the tubular member 18 and the flexible tube or sweeper member 13 and is discharged in a jet from the sweeper portion 13c. At this time, the pressure of this mixture is of such a magnitude that the flexible tube 13 bent downwardly so far is caused to extend straight. And, the strips 13b of the sweeper portion 13c are caused by the pressurized liquid/air mixture to flutter or move irregularly. Therefore, when the sweeper portion 13c of the flexible tube 13 is brought into contact with a surface of an object 35 to be washed, the jet of wash fluid is caused to impinge on the surface, and the fluttering strips 13b impart sweeping action to the surface, so that dirt, dust and the like on the surface are swept away therefrom. When the flexible tube 13 is moved along an area 35a of the object surface indicated in a dots-dash line in FIG. 3, this area 35a is cleaned. In this case, even if the surface of the object 35 is rugged, that is, it has projections, the flexible strips 13b flutter and sweep away the dirt and dust on the surface with the aid of the jet of wash fluid. Thus, the surface of the object 35 can be efficiently cleaned without causing damage to it. In addition, the washing medium or fluid is provided in the form of a liquid/air mixture ~56000 having a less specific gravity than the liquid itself, and the fluttering of the strips 13b will further decrease the pressure of the liquid/air mixture to be discharged from the flexible tube 13. Therefore, the possibility of damage to the surface of the 5 object 35 will be further prevented.
When the compressor 32 is not connected to the inlet 31 of the nozzle 11 with the inlet 31 being opened and when the wash liquid is fed to the nozzle 11 from the liquid pump 12, the air is drawn into the bore 18a of the tubular portion 18 thro~uqh the 10 space between the tapered aperture 20 and the tip end of the tubular portion 24 to form the liquid/air mixture together with the wash liquid. In this condition, the flexible tube 13 i~
caused to extend to effect the washing operation to some extent.
~owever, the air content of the mixture or fluid passing through 15 the flexible tube 13 is small, and the flow rate of this fluid is low, so that the flexible tube can not be maintained straight and is subjected to vibration or movement. And, when the inlet 31 is closed with only the wash liquid passing through the flexible tube 13, the flow rate of the fluid p~s~ing through the flexible 20 tube 13 i8 low, so that the flexible tube 13 is not caused to extend with its free end directed downwardly and is subjected to substantial movement. Thus, in this condition, the washing operation can not be carried out. However, if the straight passageway 28 of the nozzle 11 has a relatively large diameter, 25 the washing operation can be effected to some extent. However, in this case, the flexible tube 13 is subjected to wavy action or movement, and a substantially increased flow rate of the wash liquid passing through the flexible tube 13 is required. As a result, the surface of the object 35 is subjected to an increased 30 pressure. This is not desirable.

12~000 A washing system 40 shown in FIG. 5 comprises a washing unit 4Oa which comprises a movable base 41 and a plurality of washing apparatuses 10 shown in FIG. 1. The washing apparatuses 10 are mounted on the base 41 in juxtaposed relation, and the base 41 is 5 moved by a drive means (not shown) in both directions X and Y in PIG. 5. A photosensor 43 is mounted on the base 41 to sense the distance between the base 41 and the object 35 to be washed. A
detector 45 is also mounted on the base 41 through an elongated support member 46. The detector 45 comprises an oval body made 10 of a soft material and is operated to feed a detection signal upon contact with the surface of the object 35.
The operation of the washing system 40 will now be described with reference to FIG. 6. The base 41 is moved in the direction Y in FIG. 5, and the base 41 is also moved in the direction X
lS toward the object 35. When ~he distance between the base 41 and the surface of the object 35 reaches a predetermined distance, the photosensor 43 feeds a sensing signal to a control circuit 46 under the control of which the liguid pump 12 and the compressor 32 are operated to feed the wash liquid and the compressed air, 20 respectively, to the nozzle of each washing appar~tus o the washing system 40. As a result, the flexible tubes 13 are caused to extend straight by the fluid passing therethrough to bring the sweeper portion 13c of each washing apparatus into contact with - the surface of the object 35. Thus, the surface of the object 35 25 is washed and cleaned in the manner described above for the washing apparatus 10 in FIG. 1. The distance between the base 41 and the surface of the object 35 is kept constant by the photesensor 43 during the movement of the base 41 in the direction Y. Upon contact with the surface of the object 35 or a 30 projection thereon, the detector 46 feeds the detection signal to ~;~56000 the control circuit 46 under the control of which the base 41 is moved away from the surface of the object 35 to cause the sweeper portion 13c to properly contact with the surface of the object 35.
The washing system may comprises a plurality of washing units 40a to effect the washing over a greater area easily and quickly.
The washing tests were carried out using samples 1 to 11 shown in TABLE below, and two kinds of nozzles 11 having~flow 10 paths 28 having respective diameters of 4 ~m and 5 m~ were prepared for each sample except for sample 11. The washing test was made to clean a honeycomb part of ~n airplane which required a fluid pressure of 100 g/cm2 for the cleaning. The nozzle for sample 11 had no inlet 31 and the diameter of its passaqeway 28 15 was 6 m~. The flexible hose~ 13 were made of various materials shown in TABLE were used. The flexible hose 13 for sample 2 comprised a hose of vinyl and a sweeper portion 13c secured to the free end of the hose and composed of cotton strings. The results of the washing tests are also shown in TABLE. As seen 20 from TABLE~ sample 10 achieved the most excellent washing, and sample 2 was acceptable. The sweeper portion formed by cutting the distal end of the flexible tube longitudinally achieved a better cleaning effect than that formed by the cotton strings of sample 2. It was preferred that the length of the strips 13b and 25 therefore the length of the slits 13a were 60 mm. With respect to sample 11, the washing medium was solely made of the wash liquid, and therefore it was necessary to increase the flow rate of the liquid. This increased the pressure to which the objected to be washed was subjected, and therefore was not desirable. It 0 was concluded that the flexible tube 13 was caused to extend ~;~5600~) straight with the sweeper portion 13c effecting a satisfactory movement when the parameters of the nozzle 11 of the aspirator type and the pressures of the wa~h liquid and compressed air were optimally selected, in which case a relatively small pre~sure of 5 not more than 20 g/cm2 was applied to the surface of the object to be washed.
In the case where no pressure limitation i3 imposed upon the ~urf~ce of the object to be wa~hed, only the use of wa~h liquid of a high pressure as the washing medium can move or flu~ter the 10 sweeper portion 13c and achieve ~ satisfactory clean~ng. Al80, in the c~se where the sweeper portion 13c secured to a hose of either a flexible or a rigid materi~l i8 ~ade of stringer~ of cotton, sponge or the like, a satisf~ctory washing can be carried out if the pressure of the washing fluid i~ increased to 15 necessary extent.
As aescribed above, with the washinq apparatu~ according to the pre~ent in~entio~, the jet of wa~hing fluid ~nd the sweeper portion can jointly provide for a sati~factory washinq operation without exerting an undue pre~sure on the surface o~ the object 20 to be washed.

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Claims (2)

Claims:

1. A washing apparatus comprising:
a liquid pump for supplying wash liquid under pressure;
and a washing unit including:
a nozzle having a liquid inlet to which said liquid pump is connected to apply the wash liquid thereto, said nozzle having an outlet for discharging the wash liquid, and a hollow sweeper member connected at one end to said outlet of said nozzle for discharging the wash liquid in a jet from the other end, said sweeper member having at said other end a sweeper portion comprising a plurality of flexible strips peripherally mounted around said other end whereby said flexible strips are caused to flutter when the jet of wash liquid is discharged, in which said nozzle further has a chamber, a passageway communicating said liquid inlet with said chamber, a bore communicating said chamber with said outlet and disposed in coaxial relation to said passageway, and an air inlet communicating said chamber with the exterior of said nozzle, said passageway having one end, remote from said liquid inlet, disposed in closely spaced relation to one end of said bore remote from said outlet for drawing the ambient air into said bore via said air inlet when the jet of wash liquid is fed from said passageway to said bore, thereby producing a liquid/air mixture.

2. A washing apparatus according to claim 1, in which said air inlet is connected to an air compressor for feeding air under pressure into said chamber.