DE8800847U1 - High pressure cleaning device - Google Patents

Description

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The invention relates to a high-pressure cleaning device according to the preamble of claim 1.

Known high-pressure cleaning devices of this type have, among other things, the disadvantage that the way in which the various parts are arranged in the housing is rather complicated, and therefore the assembly work to be carried out during production is time-consuming. For the same reason, any subsequent repair or maintenance work is also rather complicated to carry out.

The object of the present invention is to create a high-pressure cleaning device of the type mentioned at the outset which avoids the disadvantages mentioned above , and this object is achieved according to the invention by a high-pressure cleaning device which has the features described in the characterizing part of claim 1. This ensures that during production the intermediate part can first be assembled with the motor-pump unit, optionally together with other control and operating elements, and then the high-pressure cleaning device can be completed by assembling the lower part and the upper part. In the event of any repair work, it is normally only necessary to remove either the upper part or the lower part in order to gain access to the parts to be checked.

The embodiment described in claim 2 achieves a further simplification of the production, since firstly the manufacture of the intermediate part is simple, secondly its surrounding casing can form part of the wall in the housing of the high-pressure cleaning device, and thirdly the attachment of the motor-pump unit to the bottom of the intermediate part results in a protected arrangement of the motor-pump unit.

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The embodiment described in claim 3 ensures that the pump is accessible from all sides except the side facing the motor simply by removing the lower part of the housing.

The embodiment described in claim 4 provides good access to the organs arranged on the upwardly directed base of the intermediate part in a corresponding way*

By means of the embodiment described in claim 5, it is achieved, with relatively little additional effort, that the parts arranged in the housing are kept constantly cool.

The embodiment described in claim 6 largely prevents any liquid drops reaching the high-pressure cleaning device from being sucked in by the cooling air.

The invention will be explained in more detail below with reference to the embodiment of a high-pressure cleaning device according to the invention shown in the only figure of the drawing.

The drawing essentially shows only the parts of the high-pressure cleaning device that are necessary to explain the invention. Those skilled in the art will know which parts, in addition to those shown, will be necessary under the operating conditions applicable in the respective cases.

The high-pressure cleaning device shown in the drawing comprises a housing consisting of a lower part 1, an intermediate part 2, 3 arranged on the lower part, and a

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to the upper part 4 arranged on delta ZttfiaclietiCell.

In the embodiment shown, the lower part 1 is designed as a bowl with a flat base so that it can stand on a base, e.g. a floor. And it has the necessary strength to support the rest of the high-pressure cleaning device when it stands on the base.

In the illustrated embodiment, the intermediate part consists of a surrounding casing 2 and a base 3, which is firmly connected to the casing 2 and is preferably made in one piece with it, so that the intermediate part 2, 3 appears as a cup with a base on top.

In the embodiment shown, the upper part 4 is designed as a bowl with a base on top and, in a practical embodiment, is provided with a handle (not shown) which can be attached to the upwardly directed base of the upper part 4 or can be formed as one piece therewith.

The lower part 1, the intermediate part 2, 3 and the upper part 4 are fastened to one another by means of suitable elements (not shown) such as screws, for safety reasons preferably in such a way that they cannot be separated from one another without the use of tools. Both the lower part 1, the intermediate part 2, 3 and the upper part 4 are made of electrically insulating material, such as fiber-reinforced plastic.

The upper bearing plate 5 of an electric motor 6, 7 is fastened to the underside of the base 3 of the intermediate part in such a way that a ventilation opening 8 in the bearing plate 5 and a ventilation opening 9 in the base 3 are in alignment.

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The motor 6, 7 comprises, in a known manner, a stator 6 provided with a winding and a rotor 7. Additional ventilation openings 10 are arranged in the sides of the upper bearing plate 5, while ventilation openings 12 are formed in the sides of the lower bearing plate 11.

The motor's drive 7 is arranged in a known manner on a continuous shaft 13, which is supported in suitable shaft bearings 14 and 15, of which at least the shaft bearing 14 is designed as a combined axial and radial bearing.

The lower end of the shaft 13 continues in an eccentric part 16, which is surrounded by a bearing 17, the non-rotating part of which is connected to a common piston rod 18 for two "boxer pistons" (not shown) that form part of the liquid pump of the high-pressure cleaning device, the housing of which, incidentally, is shown schematically and is designated by the number 19. The pump housing 19 is provided with an inlet nozzle 20 and a drain opening 21 that protrude on opposite sides of the pump housing through the side wall in the bowl-shaped lower part 1, where they are coupled together in a manner not shown in detail with a supply hose 22 and a pressure hose 23, respectively. The opposite end of the pressure hose 23 (not shown) is connected in a known manner, for example to a spray gun, with which a thin jet can be directed under high pressure onto a surface to be cleaned.

The pump housing 19, and thus the inlet nozzle 20 and the outlet opening 21 and the hoses 22 and 23 connected to it, are electrically insulated from the motor 6, 7, partly by means of Qingr an insulating plate 24 arranged between the pump housing 19 and the lower bearing plate 11 of the motor, partly by means of an electrically insulating jacket 25/ which

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completely surrounds the lower end of the shaft 13 and its eccentric part 16, and partly by means of electrically insulating lining elements 26 which surround a number of rod bolts 27 in the pump housing 19 which are screwed into the lower bearing plate 11, whereby the pump housing 19 is clamped against the bearing plate 11. Residual current paths 28, 29 and 30 around the heads of the rod bolts, at their exit from the pump housing 19 and between the rod bolts and the upper part of the pump housing 19 ensure a satisfactory insulation resistance even in the presence of a certain amount of moisture.

At the upper end of the drive shaft 13, opposite the ventilation openings 8 and 9, a fan rotor 31 is arranged, which in the example shown is designed as a centrifugal rotor with axial inlet and radial outlet.

In the lower part of the housing 1 to 4 of the high-pressure cleaning device a number of ventilation openings 32 are arranged, and in the upper part of the housing above the base 3 of the intermediate part a number of ventilation openings 33 are also provided. When the motor 6, 7 rotates, it partly drives the pump (not shown in detail) located in the pump housing 19, which pumps liquid from the inlet nozzle 20 to the drain opening 21, and partly the fan rotor 31, which sucks cooling air through the motor 6, 7, namely in through the openings 32, then through the openings 12 and 13, and finally out through the opening 8, as the rotor pushes the air from the inside of the upper part 4 out through the ventilation openings 33. In this way, a cooling air flow is generated, through which both the motor 6, 7, the pump arranged in the pump housing 19 and any other parts, e.g. electrical parts, can be cooled during operation of the high-pressure cleaning device.

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In order to prevent moisture from penetrating through the opening 34 arranged therein through which the electrically insulating jacket 25 extends due to the difference in air pressure between the underside and the top of the insulating plate 24, a simple labyrinth seal is provided at this point in the form of a shell collar 35 formed on the jacket 25, the edge of which projects into a groove 36 arranged on the underside of the insulating plate 24.

The motor 6, 7 is connected by a schematically shown branch connection 37 to an electrical unit 38, which may contain e.g. a capacitor, a fuse and other protective devices, and which in turn is connected by a manually operated switch 39, e.g. a pressure switch, which can be operated from the outside of the upper part 4 and is connected by a cable 41 to a two-pole mains connection 40. Since the stator 6 is electrically insulated by the insulating housing 1 to 4 from the environment and by means of the above-mentioned electrically insulating members from the pump housing 19 and thus from the parts in contact with the fluid, it is normally not necessary to use a so-called double-insulated motor or to connect the device to earth. With regard to the earthing connection, it should be noted that less technically experienced users not infrequently remove the earthing pin of a mains connection so that the plug can be inserted into a general socket without earthing. This safety risk is therefore avoided using the high-pressure cleaning device described here.

At least the ventilation openings through which the cooling air flows into the housing, i.e. in the example shown the openings 32 at the bottom, should be protected against the suction of liquid drops. In the example shown this is achieved by means of a mudguard that is closed at the top.

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&rgr; gels 42 so that the air can only flow in from below, whereby the risk of liquid drops being sucked in is considerably reduced.

In order to direct the cooling air in a desired manner, the intermediate part 2, 3 can be provided with suitable air guide elements, e.g. air guide plates 43 and a partition wall 44 which separates the space accommodating the motor 6, 7 from the space in which

jj in which the electrical unit 38 is located. Experts in this field know how to arrange air baffles, partitions and similar devices so that the cooling air is directed to

; is forced to move in the desired paths.

During repair or maintenance work, the lower part 1 and/or the upper part 4 is/are separated from the intermediate part 2, 3 by

The pump housing 19 and the fan rotor 31 are thus easily accessible for repair or cleaning, while the motor 6, which normally only needs to be checked rarely,

remains protected even in the intermediate part 2, 3.

j In the embodiment shown, which shows the preferred embodiment, the pump housing 19 is arranged under the motor 6, 7. This reduces the risk that any moisture in the pump housing can penetrate into the motor.

There is of course no obstacle to using a double-insulated motor, and if necessary, not only will you achieve even better insulation safety, but also a reduction in capacitively transmitted voltages from the mains, which may affect the function of sensitive devices located near the high-pressure cleaning device.

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Claims (1)

EUROPEAN PATENT ATTORNEYS; "... &bull; ■ ■ MANITZ, FINSTERWALD & ROTERMUND Knud Erik Westergaard Rolighedsvej 28 DK-9560 Hadsund Denmark GERMAN PATENT ATTORNEYS DR. GERHART MANITZ ■ dipl.-phys. MANFRED RNSTERWALD · Dipl.-Ing., Dipl.-Wirtsch.-Ing. HANNS-JÖRG ROTERMUND · DiPL phys. DR. HEUANE HEYN dipl-chem. WERNER GRÄMKOW ■ dipl-ing (1939-1982) BRITISH CHARTERED PATENT AGENT JAMES G. MOHGAN · B SC (Physj. d.m.S. REPRESENTATIVES BEFORE THE EUROPEAN PATENT OFFICE MANDATA1RES AGREES PRES UOFF)CE EUROPEEN DES BREVETS 8000 MUNICH 22 ■ ROBERT-KOCH-STRASSE1 TELEPHONE (089) 224211 ■ TELEX 529672 PATMF FAX (0 89) 29 75 75 (Gr. Il + III) TELEGRAMMS INDUSTRIAL PATENT MUNICH Munich, the
P/Ml-W 2233 Jan 1983 High pressure cleaning device Protection claims High pressure cleaning device with at least a) a motor-pump unit (6, 7, 19) and b) a substantially closed housing (1, 2, 4) in which the motor-pump unit is arranged, characterized , c) that the housing (1, 2, 4) comprises at least three main parts, namely el) an intermediate part (2, 3) to which the motor-puffer pump inlet unit (6, 7, 19) is attached,
c2) a lower part (1), by means of which the intermediate part (2, 3) can stand on a base, e.g. a floor, and MANlTZ FlMSfERWALD HEYN MORGAN 8000 MUNICH 22 ROBERT-KOCH-STRASSE 1 TEL. (069) 224211 TELEX 529 672 PATMF FAX (089) 297S 75 HANNS-JÖRG ROTERMUND 7D00 SULTTGART 5(MBAD &bgr;&Agr;&Ngr;&Ngr;&bgr;&Tgr;&Agr;&Tgr;&Ogr; · SBELBERGSTR. 23/25 TEL. (0711) 56 72 61 &EEgr;&Udigr;&Rgr;&Ogr;&Lgr;&Ngr;&Kgr; MUNICH 6 8B0119 980 BLZ 70020001 ' PJ)SIbJROAMT |{(Ü>!O|EnA??)6S-805 Bl2 700100 80 VEREINSBANK MUNICH 578 351 DLZ7U020270 c3) an upper part (4) covering the upper side of the intermediate part (2, 3). 2. High-pressure cleaning device according to claim 1, characterized in that the intermediate part (2, 3) has the shape of a cup with a surrounding shell (2) and an upwardly directed base (3) to which the motor-pump unit (6, 7, 19) is attached. 3. High-pressure cleaning device according to claim 1 or 2, characterized in that a) that the motor-pump unit (6, 7, 19) is arranged in the intermediate part (2, 3) and has dimensions in relation thereto such that the pump (19) projects beyond the lower limit of the intermediate part, and b) that the lower part (1) is designed as a shell surrounding the pump. 4. High-pressure cleaning device according to one or more of claims 1 to 3, characterized , a) that any auxiliary devices, such as a fan rotor (31) and/or an electrical switch (39), are arranged at the very top of the intermediate part (2, 3) and extend beyond it, and b) that the upper part (4) is designed as a curved shell surrounding the auxiliary organs. 5. High-pressure cleaning device according to one or more of claims 2 to 4, characterized , a) that the motor-pump unit (6, 7, 19) comprises three main parts, namely
al) the drive motor (6, 7) , 1*1111114« ltlllt«·««! I I I I · ■ <>··«<· Wed It a2) the pump (19) connected to one end of the shaft of the artificial pump and a3) a fan rotor (31) connected to the other shaft end of the drive motor , b) that the motor-pump unit (6, 7, 19) is attached to the upwardly directed base (3) of the intermediate part (2, 3) in such a way that only the fan rotor (31) is above the ground, c) that the floor (3) is substantially airtight; and d) that the housing (1, 2, 4) and the motor have ventilation openings (9, 32, 33) and (8, 10, 12) respectively, which are designed and arranged in such a way _that cooling air can be passed through the openings by means of the fan rotor (31). (32) in the lower part of the housing and can be discharged through the motor (6, 7) and through the openings (33) in the upper part of the housing or vice versa 4 6. High-pressure cleaning device according to claim 5, characterized in that at least the ventilation openings (32) arranged in the housing through which the cooling air flows into the housing are covered by a fender (42).