Pumps – Motor driven – Including means utilizing pump fluid for augmenting cooling,...
Patent
1990-11-08
1992-12-29
Bertsch, Richard A.
Pumps
Motor driven
Including means utilizing pump fluid for augmenting cooling,...
417370, F04B 3902, F04B 3906
Patent
active
051747308
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a high-pressure cleaning apparatus with a high-pressure pump for a cleaning liquid connected on the suction side to a preliminary tank with a feed pipe for cleaning liquid and having in the pressure pipe a bypass pipe branching off from the pressure pipe and leading to the preliminary tank, and with an electromotor driving the high-pressure pump and having a coolant pipe through which cleaning liquid flows.
In high-pressure pumps, it is advantageous for the electromotor to be cooled by the flow of cleaning liquid. However, difficulties may arise when the discharge of cleaning liquid is interrupted for with such apparatus it is customary to allow the pump to continue to operate and to recirculate the liquid conveyed by the pump. Since this liquid is used as coolant, it undergoes constant heating-up in this bypass mode, which is undesired. This applies particularly when heated liquid is to be discharged by the high-pressure cleaning apparatus, i.e., when cleaning liquid which has already undergone heating is fed to the preliminary tank. If the cleaning liquid were discharged into the environment immediately, this heated liquid would still be sufficient to cool the electromotor, but not in the bypass mode where the cleaning liquid flows through the motor repeatedly.
The object of the invention is to so improve a generic high-pressure cleaning apparatus that in the bypass mode, too, adequate cooling of the motor is achievable in any case, while excessive heating of the coolant is avoided.
This object is accomplished in accordance with the invention with a high-pressure cleaning apparatus of the kind described at the beginning by the feed pipe to the preliminary tank having a greater conveying capacity than the coolant pipe, by the coolant pipe leading into the preliminary tank and by a means for limiting the filling level being provided in the preliminary tank.
This means for limiting the filling level may be an overflow pipe. However, provision may also be made for the means for limiting the filling level to include a filling level indicator in the preliminary tank, a closure valve in the coolant pipe actuated by the filling level indicator and a switch for switching off the electromotor.
In the normal mode in which cleaning liquid is discharged, the smaller portion of the cleaning liquid travelling through the coolant pipe into the preliminary tank is thus conveyed away together with the main portion of the cleaning liquid fed directly into the preliminary tank. In the bypass mode, fresh cleaning liquid, i.e., not preheated coolant, is always fed to the coolant pipe. This is then delivered to the preliminary tank and gradually fills the latter up until it is full. The means for limiting the filling level prevents excessive filling of the preliminary tank. Since the component of the entire cleaning liquid that flows through the coolant pipe is small in proportion to the main component, effective cooling of the motor can thus be maintained for a long period of time in the bypass mode with no loss of coolant occurring as it can be collected in the preliminary tank.
It is advantageous for a closure member and a top and a bottom filling level indicator for actuating the closure member to be provided in the preliminary tank. In this way, the preliminary tank is filled essentially through the feed pipe and fully automatically by the two filling level indicators ensuring that the level of filling is always between the top and bottom filling levels.
It is advantageous for the top filling level indicator to be arranged beneath the level of the means for limiting the filling level. In this way, even when the preliminary tank is filled completely by the feed pipe, there is always a certain volume of the preliminary tank left over which can be filled up by the cleaning liquid flowing through the coolant pipe. Since the component of the cleaning liquid which flows through the coolant pipe is relatively small, cooling of the electromotor is thus possible over quite a long period of time in the bypa
REFERENCES:
patent: 2037245 (1936-04-01), Leifheit et al.
patent: 2914253 (1959-11-01), Jobus et al.
patent: 3744935 (1973-07-01), Magni
Bauer Horst
Nieuwkamp Wolfgang
Alfred Karcher GmbH
Basichas Alfred
Bertsch Richard A.
Lipsitz Barry R.
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