DE6941372U - PORTABLE, MOTOR-DRIVEN SPRAYER - Google Patents

Description

PATENTAfVWALrDl ¹ PL.-ίΝό: HANS LANGOSCH

7ΟΟΟ STUTTGART HERDWEO 62 TELEPHONE (O711) 298925

Applicant: SOLO-KIeinmotoren GmbH Maichingen near Stuttgart Portable, motor-driven sprayer

The invention relates to a portable spraying device with an electric motor, which is fed via an energy storage device arranged on the device and which drives a pump, which supplies liquid spray from a storage container via a line under pressure to a spray nozzle.

If a rechargeable battery is used as energy storage for the electric motor, which is in the portable spraying device is installed, it is important that the weight of the Battery as low as possible, but still a long service life is guaranteed.

The spraying operation has to be interrupted several times during work, the user of the spraying device closes

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then the hand valve of the spray tube with the spray nozzle. With the known motor-driven units the pump continues to run and conveys the liquid via a pressure relief valve and a return line back into the container. So even though no liquid is being applied to the spray tube, the pump is running continues at full power and is thus used in electrical

trischesa drive unnecessarily stress consuming, too if not injected.

To solve the problem, the invention provides that an air tank is connected between the spray nozzle and the reservoir, to which the Pump the spray from the storage tank and the air tank with a pressure switch in There is a connection that drives the pump to _. when a maximum pressure is reached and

in the event of a pressure drop at a minimum pressure again in

Sets gear. At least one switching point of the pressure switch can be set and is special It has been found expedient that the pressure level at the pressure switch is adjusted with the same pressure difference between the maximum and minimum pressure can be. Is the pressure difference between the maximum and minimum pressure is very small, so the efficiency of the system is due to the frequent, with a

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start-up of the drive associated with high inrush current is impaired. If, on the other hand, the pressure difference is large, it must be conveyed against an unnecessarily high pressure at times, with the use of energy likewise deteriorating. The difference between maximum pressure and minimum pressure is _Λ selected such that a minimum in the upstream

nearness results. The best value is achieved when the Duty cycle · the mean pressure and the inrush current that occurs when the drive is switched on additionally verb-auchν becomes, in the most favorable ratio to each other. The pressure switch eliminates the need for an overflow valve. The Punpe and the Drive can always be operated in the range of their most favorable efficiency.

> Energy storage can loadable next recurrent

Batteries also fuel cells or the like

j are used.

An unnecessary idling of the pump when the storage tank is empty is prevented by the fact that the pressure switch switches off the drive if the pressure drops below the minimum pressure.

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Installation and maintenance of the device are particularly important.

times if the air chamber is essentially within | i of the storage container is arranged and the pressure g]

switch sits on one end of the air chamber protruding from the storage container. A particularly preferred embodiment results from the fact that \ the surge tank, the pump and the drive has a ^{construction:}

Form unit and this structural unit at least partially through an opening in the storage container can be pushed in and is tightly fastened there.

For easy storage, a wall is connected to the storage container in one piece, the storage feet

ι has. There is between the adjustable feet and!

The energy storage device, the drive and the pump are arranged in an easily accessible manner at the bottom of the reservoir.

Piston pumps, gear pumps, capsule pumps, membrane pumps or the like can be used as pumps, which have a Gearbox or directly connected to the electric motor. ;

Further details of the invention are based on the drawing, which is only one example embodiment represents, explained in more detail. Show it:

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FIg. 1 shows a section through a spray device along line I - I in FIG. 2,

Fig. 2 is a side view of the device.

In a storage container 1, the filling opening 2 of which for a spray 3 is closed by a cover U, a structural unit 7 is inserted through an opening 6 arranged on a base 5 and fastened tightly. The structural unit 7 consists of an electric drive, namely an electric motor 8 which is coupled to a piston pump 10 via a gear 9 and an air chamber 11 at the lower end protruding from the storage container 1 next to the piston pump 10 a pressure switch 12 are arranged. The piston pump 10 is connected to the reservoir 1 via a suction valve 13 and to the air chamber 11 via a check valve ik.

A battery 15 »serves as an energy store electrical lines 16, 17, 18 feeds the electric motor 8. The pressure switch 12 interrupts and closes the electrical circuit between the battery 15 and dam motor 8, it can be short-circuited via a short-circuit switch 11.

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The air chamber 11 is via a line 20 in which a manually operated valve 21 is arranged, connected to a spray nozzle 22.

At the upper end of the storage container 1 and on a wall 23 which extends beyond the lower end of the storage container 1 and which has angled adjustable feet Zk, two carrying straps 25 are attached. Between the adjustable feet 2k and the lower floor 5 of the storage container 1 there is a free space in which the battery 15 and the parts of the structural unit 7 protruding from the storage container 1 are easily accessible.

When the short-circuit switch 19 is depressed, the electric motor 8 and thus the piston pump 10 via the transmission 9 are set in motion. It sucks on the suction valve 13 spraying 3 ^au s to the storage container 1 and forces it through the check valve 14 in the surge tank 11. Upon reaching a specific minimum pressure of the pressure switch 12 is closed, by releasing the short-circuit switch 19, the pump then continues until, at A set maximum pressure the pressure switch 12 interrupts the power supply to the electric motor 8. When the valve 21 is opened, this flows under pressure

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standing spray 3 from the air chamber 11 over the line 20 to the spray nozzle 22 and is sprayed there. If the pressure in the air chamber 11 drops below one the minimum pressure set on the pressure switch 12, the electric motor 8 turned on again. As soon as the spray 3 in) storage tank 1 is used up, despite lukewarm,

fender piston pump 10 the pressure in the air chamber 11

f further on. The pressure switch 12 is now appropriate

% designed so that when the pressure continues to fall

the power supply to the electric motor 8 is interrupted. ΐ After filling the reservoir 1 and the

. "Starting" the device via the short-circuit switch

, 19 the device is ready for use again. By a

corresponding training of the pressure switch 12 can

; the short-circuit switch 19 can be saved.

The advantages achieved by the invention exist

especially that with one - battery charge

j with a relatively small battery capacity and low

Battery weight the largest possible amount of fuel

medium can be applied. Because d «» r Battery power is only drawn when the electrical work is actually converted into useful spraying work can be done with a battery

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filling a full working day under normal operating conditions, the battery is then recharged overnight without the need to disconnect it from the Device to solve. Due to the arrangement made, the device is particularly simple, it is light to operate and works trouble-free «

Claims (1)

Protection claims 1) Portable sprayer with one over one on the device -arranged energy storage powered electric motor, which drives a pump that draws liquid spray from a reservoir via a Line feeds a spray nozzle under pressure, characterized in that between the spray nozzle (22) and storage tank (i) an air chamber (11) is connected, to which the pump (1O) the spray agent (3) from the storage container (1) and the air chamber (11) is connected to a pressure switch (12) which stops the drive of the pump (1O) after reaching a maximum pressure and starts up again in the event of a pressure drop at a minimum pressure. 2) Spray device according to claim 1, characterized in that at least one switching point of the pressure switch (12) is adjustable. 3) sprayer according to claim 2, characterized gekennz3lehnet, that with the same pressure difference between the boiling point and minimum pressure; ck the pressure level asa pressure switch (12) is adjustable. .ίο. k) Spray device according to claim 1, characterized in that the Druckachalter (12) at a pressure if the pressure drops below the minimum, shut off the drive ^f tet. 5) Spray device according to claim 1, characterized in that the air chamber (ii) i «is arranged essentially within the storage container (1) and the pressure switch (12) is connected to a, from the storage container (1) protruding end of the air chamber (ii) sits. 6) Spray device according to claim 1, characterized by the fact that the air chamber (ii) is asymmetrical housed in the storage container (1) and the energy storage to achieve a medium The center of gravity is arranged on the opposite side of the container. 7) Spray device according to claim 1, characterized in that a wall (23) is connected in one piece to the reservoir (i), the adjustable feet (2U) and feet between the point {2k) and. the bottom (5) of the storage container (1) the energy storage, the drive and the pump are arranged. - 11 - 8) Spray device according to claim 1, characterized in that the air chamber (11), the pump and the Drive form a structural unit (7) and this structural unit (7) at least partially by a Opening (6) in the storage container (1) can be pushed in and is tightly fastened there.