EP3978141A1 - Pressure spray device - Google Patents

Abstract

Pressure spray device with a pressure container, an electric pump and an electric storage device for supplying energy to the electric pump, with the electric pump building up a container pressure in the interior of a pressure container. The invention is characterized in that the electrical storage device is arranged outside the interior of the pressure vessel, preferably on the side on the outer wall of the pressure vessel or on the side of the housing of an insert for the pressure sprayer, the insert comprising the electric pump.

Description

The invention relates to a pressure spray device with a pressure container, an electric pump and an electric storage device for supplying energy to the electric pump, with the electric pump building up a container pressure in the interior of the container.

Pressure sprayers for different applications have become known from a large number of publications.

From the DE 94 15 691.3 a pressure spray device, in particular a hand-held fire extinguisher or crop protection spray device, has become known, which comprises a spray agent container that can be acted upon by pressurized gas and a hose connected to the spray agent container with a one-sided valve for dispensing the spray agent.

the DE-U 84 20 572 shows a portable pressure spray device that is characterized in that the spray medium pressure container is provided with an upper filling opening that can be closed by a hand pump that can be used, as well as openings for a pressure indicator and for a pressure relief valve, as well as a connection opening for a spray hose. A disadvantage of all the pressure sprayers mentioned above was that the pressure in the pressure sprayer, which was required to apply the spray and is preferably in the range from 1.5 to 1.6 bar, was built up in particular with the aid of a hand pump. When spraying, the pressure when the spray is applied is reduced. In the prior art, therefore, the pressure in the pressure vessel would have to be increased again by manual pumping after a certain period of time during which the spray agent was applied.

This was time-consuming, especially in the case of large volumes.

From the U.S. 7,207,500 B2 a pressure sprayer has become known in which an electric motor drives the pump. The pump is located in the upper part of the pressure spray tank, and rechargeable battery cells are provided in the lower part of the housing, which protrudes into the liquid tank. Since the battery cells arranged there cannot be removed during operation, the work process must be interrupted when charging or replacing the batteries, either until the empty battery cells are recharged or replaced.

The pressure sprayer from the WO 2012/000578 A1 has become known, which has an insert for a pressure vessel with an electric pump, in particular a diaphragm pump, in which the electric pump is also supplied with batteries or accumulators, for example NiMh accumulators, which protrude into a pressure vessel under the pump and into the pressure vessel Recording housing analogous to U.S. 7,207,500 B2 are arranged.

Similar principles are also shown by the EP 1949972 A1 and the EP 2588247 B1 . In the EP 1949972 A1 the system is designed in such a way that the battery cells can be removed by dismantling part of the pressure vessel. the EP 2588247 B1 solves this problem with a detachable battery compartment that can be removed and protrudes into the pressure vessel housing.

All of the electrical systems mentioned above have a pressure switch that turns the motor off and on again when a predetermined pressure is reached.

From the DE 10 2010 017 988 a pressure spray device for applying a spray with a pressure container has become known, the pressure container comprising a compressor connection and being able to be connected to a compressor. With the help of the compressor, gas is fed into the pressure vessel and in the container the pressure for spraying is built up. The pressure in the pressure vessel can be set and, if necessary, kept constant via an external device.

Instead of the NiMh accumulators as for example in the WO 2012/000578 A1 described, it is also possible to use a lithium-ion battery as the energy source for the electric pump. For example, from the U.S. 10,137,465 B2 a sprayer with a lithium-ion (Li-ion) accumulator has become known. The lithium-ion (Li-ion) battery according to the U.S. 10,137,465 B2 is removable on the front of the sprayer water tank according to the U.S. 10,137,465 B2 arranged. The sprayer according to the U.S. 10,137,465 B2 is connected to the water outlet of the pump.

the U.S. 5,931,207 A discloses a hand-held compressor used to spray liquids from a tank or to inflate inflatable objects. The compressor is supplied with electricity by a storage device, in particular a battery, attached to the housing of the compressor. Not shown in the U.S. 5,931,207 A is how the storage device can be exchanged quickly and easily. Nor does it show U.S. 5,931,207 A how the pressure has to be regulated in order to apply a constant volume flow.

Also the U.S. 6,109,548 A shows a pressure sprayer with an electrically operated pump. Also from the U.S. 6,109,548 A it is not clear how the memory device can be exchanged quickly and easily.

the U.S. 5,409,167 A , US 2005/0 045 75 A as US 2016/0 243 570 A also show sprayers for spraying liquids with a storage device as an energy source.

Only the US 2016/0 243 570 A shows a sprayer with a system for regulating the application pressure with small deviations from 0.1 psi to 1.0 psi. That from the US 2016/0 243 570 A known system starts the compressor in case of deviations from the preselected pressure. As previously mentioned, the deviations are between 0.1 psi to 1.0 psi. The compressor the US 2016/0 243 570 A1 has a maximum pressure level of 20 psi (1.37 bar), which is significantly lower than the pressure level of the device according to the invention, which preferably ranges from 1.5 bar to 3 bar.

When tested with pressures of up to 30psi using a hand pump US 2016/0 243 570 A a good spray pattern, but there are also drops outside the spray band. This drift and the uncontrolled spray behavior are US 2016/0 243 570 A avoided by lower pressures, preferably less than 1.5 bar, in particular 1.37 bar and less. The Indian U.S. 2016/0 243 570 disclosed compressor prototype is only capable of generating a maximum pressure of 10 psi, which is significantly less than 1.37 bar.

A disadvantage of all pressure sprayers with electric pumps in the prior art was that replacing the energy sources was time-consuming and it was not possible to easily change the accumulators.

A further disadvantage of the prior art was that the pressure in the container dropped when the liquid was dispensed. The pressure reduction meant that the volume flow of the liquid to be sprayed changed. Another disadvantage was that the pressure that could be preset was too low and the application rate could not be set precisely via the pressure. In addition, spray drift could only be avoided with pressures of less than 1.37 bar.

It is therefore the object of the invention to overcome these and other disadvantages of the prior art.

This object is achieved by a pressure sprayer according to claim 1. Developments of the invention are the subject matter of the dependent claims.

In the electrical storage device according to the invention, in particular the accumulator is arranged outside the interior of the container on the side of the outer wall of the container or on the side of the carrying handle of an insert for the pressure sprayer, the insert including the electric pump.

The pressure spray device according to the invention is characterized in that a pressure in the range from 1 to 3 bar, in particular more than 1.37 bar to 3 bar, preferably 1.5 bar to 2.5 bar, preferably in 0.1 bar increments, can be set. Furthermore, the pressure spray device has a sensor and a control which switches the electric pump on and off depending on the container pressure, which is determined by means of a pressure sensor, so that the pressure set on the display is maintained.

The adjustability of the pressure in the range of 1 to 3 bar allows the pressure sprayer according to the invention to be used in four main areas of application.

One area of application is the use against insecticides and fungicides. When it comes to fungicides and insecticides, plants in the garden are preferably sprayed from the underside of the leaves. The pressures are preferably in the range from 2 to 2.5 bar and the volume flow is between 500 and 1500 ml/min. In this area, the droplets, in combination with a 1 mm hollow cone nozzle, are fine enough to wet the underside of the leaves. Pressures that are too low, as in the prior art, result in larger droplets that cannot be sprayed far enough or drip off the underside of the leaf if the distance between the plant leaf and the nozzle is too small.

Another area of application is the spraying of herbicides. In the case of herbicides for eliminating harmful plants, it is undesirable for the droplets to drift off due to the wind, since they can then contaminate crop plants. In coordination with a suitable nozzle (here the nozzle manufacturer specifies a suitable combination of nozzle diameter and system pressure), low-drift spraying can be carried out at a pressure of around 1.5 bar, particularly in the range of 1.37 bar to 1.6 bar.

In addition to spraying plant protection products, it is also possible to spray disinfectants or cleaning agents. When spraying disinfectant on surfaces, e.g. in rooms, an area-wide wetting of the surfaces should preferably be achieved with small drops. The application of these agents leads to the best results at more than 2 bar, in particular 2.5 bar and a volume flow of 2.3 l/min.

Generating foam through a suitable nozzle design requires a pressure of over 2 bar, preferably 2.5 bar. A pump flow rate of at least 4.0 l/min at 2 bar is sufficient. The foam can be sprayed continuously with the pressure spray device according to the invention, with the pump conveying a sufficient volume flow without the pressure in the container dropping below 2 bar during continuous operation. Regarding the foaming is on the EP 2 308 603 A1 referenced, the disclosure of which is incorporated in its entirety in the present application.

Preferably the pump is housed in a housing which is part of the insert. A very particularly easy exchange is made possible if a fastening device, which enables the storage device, in particular the accumulator, to snap into place, is provided on the container or on the housing, which is part of the insert. It is very preferred here if the accumulator is arranged on the outside of the container or on the wall of the housing which accommodates the pump. Preferably, the accumulator can Sliding rails are pushed in until the storage device or the accumulator engages and the power supply is made via electrical contacts from the inserted storage device or accumulator to the pump.

Instead of the previously used nickel-metal hydride cells as in the WO 2012/000578 A1 described, lithium-ion batteries are used in the spray device according to the invention as a storage device, which can also be used for other applications in households or power tools. In order to protect the electrical connection between the storage device or accumulator and the housing against the ingress of water, it is advantageously provided for the accumulators or storage device to be surrounded by a protective cover which also has a sealing effect against the housing of the pump.

In order to ensure that the pressure required for the spraying process is always present in the container of the pressure sprayer, pressure sensors are provided in the pressure sprayer according to the invention, which detect the pressure loss when the spray liquid flows out in the container and forward it to a pressure regulator. The pressure sensors are preferably provided in the housing of the insert that accommodates the electric pump. As soon as the pressure loss measured by the pressure sensor reaches a lower limit, the pressure control switches on the electric pump. Compressed air is then fed into the container of the pressure sprayer by the pump until an upper limit value is reached. The pressure control then switches the pump off again. By constantly monitoring the pressure and switching the electric pump on and off, it is possible to maintain a preset pressure in the pressure sprayer tank.

If too tight a tolerance is specified for switching on and off, for example in the form of the prior art US 2016/0 243 570 A , this causes the pump to start and stop constantly. Then this has the disadvantage that there is very high wear on the pump. It is therefore preferably provided that the tolerance for switching off the pump is preferably in the range of 2 to 20%, preferably 10%, in particular 5%. This means that, for example, at a specified target pressure of 2 bar, if the pressure falls below 1.6 bar with a tolerance of 20%, the pump starts again. A very particularly preferred tolerance range for preventing a pump from pulsing is a tolerance of 10%, ie at a setpoint pressure of 2 bar, the pump would be put back into operation if the pressure fell below 1.8 bar. The tolerance is also referred to as hysteresis, by which a lower limit value can be undershot before the pump is put into operation. In the example above, the setpoint pressure is an upper limit value, for example of 2.0 bar, and the lower limit value determined with a hysteresis or tolerance of 10% is a pressure of 1.8 bar.

The pressure, which is preferably kept constant with a tolerance in a predetermined pressure range, means that a constant volume flow is guaranteed. In this way it can be ensured that not an unnecessarily large amount of spray liquid, in particular plant protection products, gets into the environment. On the other hand, the pressure also determines the droplet size of the spray mist. If the pressure is too high, the droplets are smaller and can therefore contaminate plants that should not be sprayed at all by drifting in the wind. Drops that are too large, which occur at low pressure, prevent sufficient wetting of the plant leaves. In the case of insecticides, it is advantageous if the pressure is adjusted so that small droplets are present. In such a case, a fine mist is formed that ensures complete wetting of the leaves. The pressure for applying insecticides is preferably between 2 and 2.5 bar.

In the case of herbicides, a larger droplet size should be aimed for, so that the droplets are prevented from drifting. The pressure is preferably in the range from 1 to 2 bar, preferably around 1.5 bar, in particular not more than 1.5 bar.

A constant pressure is required for use in foam generation in cleaning, for example of motor vehicles, so that the set foam quality remains the same during the foaming process. In order to provide a satisfactory foam quality, the pressure is in the range from 2 to 2.5 bar, but at least 2 bar, since foam formation below 2 bar does not take place. For uniform wetting, it is advantageous if a constant pressure is maintained. A pressure sprayer for applying foam with a hand pump, for example, describes the EP 2 308 603 A1 , the disclosure content of which is incorporated in full in the present application. In particular, in the EP 2 308 603 A1 describes the parameters that are decisive for good foaming.

For the application of formwork oil to formwork, e.g. for concrete as a release agent, different working pressures must be set depending on the viscosity of the oil. A constant pressure can be used to achieve an evenly wetted surface in such an application.

In the event that more volume of air is taken from the container than the pump can deliver, the working pressure will be below the set target pressure and the pump will run.

The pump is preferably designed in such a way that a sufficient volume flow in a pressure range between 1 and 3 bar, particularly preferably between 1.5 and 2.5 bar, is made available for different spray applications and requirements. In particular, the pressure is set on a control panel, preferably a display device, in particular a display, in the range from 1.5 to 2.5 bar. In order to prevent the pump from pulsing, it is provided that the pump is switched on again if there are deviations in the range of 2 to 20%, preferably 10%, from the desired pressure, for example if the pressure falls below an internal limit value. With such a tolerance, there is sufficient time between switching the pump on and off so that wear is minimized.

In a first embodiment of the invention, a pendulum piston pump is used as the electric pump. When using a pendulum piston pump, the piston is sealed to the cylinder with the help of a rubber membrane. As a result, the pendulum piston pump combines the advantages of the diaphragm pump with those of the piston pump. Advantageously, the pendulum piston pump runs more quietly than a piston pump and does not have to be lubricated. It is particularly preferred if the air sucked in from the housing is compressed by the piston of the pump and fed into a pressure hose via an outlet valve. The pressure hose in turn ends in the container of the pressure sprayer. By introducing air with the help of the piston pump via the pressure hose into the container of the pressure sprayer, the gas cushion in the container and thus the pressure in the pressure sprayer are set. Since the pressure sensor measures the pressure in the container, the pressure in the pressure spray device can preferably be set in the range from 1 to 3 bar with the aid of the electric pump and the control or control unit. The pressure sensor is preferably arranged on the back of a circuit board of the control panel. The pressure sensor located there is connected to the container via a hose. In this way, the pressure in the container can then be determined. The pressure hose is preferably made of silicone, polyurethane or PVC. With the help of a preferably flexible hose made of the aforementioned materials, the individual components can be installed better in the relatively small available installation space than, for example, with stiff pipes. The hose itself is preferably connected to a pressure nipple on the housing, so that compressed air can be fed into the tank or pressure vessel via this nipple. Furthermore, an inlet valve is preferably provided between the pump housing and hose, which only opens when compressed air flows in the direction of the nipple and thus into the container. In this way it is possible to maintain the internal pressure in the container even when the pump is switched off. The pressure sensor is preferably connected to the pressure nipple via the pressure hose or another hose.

To protect the motor against seizing, it is advantageous if the pump can be operated in reverse mode. With high tank pressures and an unfavorable piston position, the motor can stall when it starts up. If the pump is equipped with a reverse mode, the reverse mode causes the motor to reverse briefly and restart immediately. For this purpose, the motor current is measured and the reverse current is activated when a specific motor current value is exceeded. This ensures that the motor starts up quickly and without problems, even if the motor is in an unfavorable position.

The invention will be described below by way of example with reference to the drawings.

Fig. 1:

ein Drucksprühgerät gemäß dem Stand der Technik

Fig. 2:

ein Gehäuse eines Einsatzes mit einer elektrischen Pumpe für ein Drucksprühgerät

Fig. 3a:

eine erste Schnittdarstellung des Gehäuses des Einsatzes mit verdeckter Platine.

Fig. 3b:

eine weitere Schnittdarstellung des Gehäuses des Einsatzes mit Platine

Fig. 3c:

Kennlinie Volumenstrom in Abhängigkeit vom Tankdruck

Fig. 4:

Gehäuse des Einsatzes mit angebrachtem Akkumulator

Fig. 5:

Drucksprühgerät mit einem erfindungsgemäßem Einsatz und elektrischer Pumpe

Show it:

Figure 1:

a pressure sprayer according to the prior art

Figure 2:

a housing of an insert with an electric pump for a pressure sprayer

Figure 3a:

a first sectional view of the housing of the insert with hidden circuit board.

Figure 3b:

another sectional view of the housing of the insert with circuit board

Figure 3c:

Characteristic volume flow depending on the tank pressure

Figure 4:

Housing of the insert with attached accumulator

Figure 5:

Pressure sprayer with an insert according to the invention and an electric pump

figure 1 shows a pressure sprayer or a pressure spraying device 1 according to the prior art in a first embodiment with a hand pump in section. the inside 1 The pressure sprayer 1 shown comprises a pressure vessel 3 and a hand pump 5. The hand pump 5 is connected to the pressure vessel 3 via a screw connection 7. The hand pump 5 can be detached from the pressure vessel 3 in order to fill the inside of the pressure vessel 3 with liquid spray. The spray liquid can be filled up to a maximum level of 11. In an embodiment according to 1 the volume V _spray of the spray at the maximum level is 5 l and the volume V _gas of the gas cushion is 2 l. The total volume of the device would then be 7 l. The ratio of the volume V _gas of the gas cushion to the volume V _spray of the spray, after a pressure has been built up in the pressure spray device, determines the application time of the spray.

In the embodiment shown according to the prior art, the pressure in the pressure sprayer is built up by means of the hand pump 5 . According to the invention, the 1 illustrated hand pump by an electric pump, which is preferably used in an application, as in the Figures 2 to 4 shown, housed, exchanged. The pressure build-up then takes place instead of manual pumping by means of the in Figures 2 to 4 illustrated, integrated in the use of the invention, electric pump. It can also be used with an electric pump with the pressure tank via a screw connection like the hand pump figure 1 get connected

By applying the spray, the pressure built up in the container by the hand pump or the electric pump is released. After a certain period of time, the pressure in the pressure vessel must therefore be increased again by re-pumping with the hand pump or the electric pump according to the invention in order to enable the spray medium liquid in the pressure vessel to be discharged again. The larger the gas cushion is compared to the volume of the spray solution or spray liquid, the longer the period after which the pressure can be increased again by pumping must be chosen. According to the invention, a constant pressure in the container can be set, preferably in the range of 1 to 3 bar, by constantly monitoring the pressure in the container and by controlling the electric pump on and off depending on the container pressure, which is determined by the pressure sensor can do what is not possible with a hand pump. With the hand pump, a set pressure drops continuously.

figure 2 shows the housing 100 of the insert with the electric pump, which is used instead of the hand pump, as in 1 shown can be used in the pressure vessel. The housing 100 of the insert includes a carrying handle 102 and a thread, in particular a screw-threaded socket 104 for screwing the insert into the container of the pressure sprayer. The carrying handle 102 is designed in such a way that it is able to take the weight of the filled container. The screw-threaded socket 104 is interchangeable. This means that the pump can also be adapted for other sprayers with different threads and connected to a wide variety of containers. All necessary settings for the pressure sprayer can be made on the display device or the display 106 of the housing in which the pumps are housed. As evident in figure 2 As can be seen, the housing of the insert is constructed asymmetrically. Electrical contacts 110 are provided on the side of the wall 108, which can be connected to the storage device or the accumulator in a simple manner by sliding the storage device onto slide rails 112, which are attached to the side of the housing. The electrical contacts 110 then snap into corresponding openings in the electrical storage device, so that an electrical connection is established between the accumulator and the housing and the electrical supply of the pump arranged in the housing is ensured. The fact that the storage device can be easily removed from the side wall via the slide rails 112 and reattached to it means that the storage device can be changed quickly and easily without having to open the container to change the accumulator.

Figure 3a shows a sectional view of the housing 110 of the insert with the circuit board 210 of the control unit covered. Same components as in figure 1 are given the same reference numbers. The unit or housing 110 includes the electric pump. The so-called motor pump unit 200 with the electric pump is arranged in the housing 110 at an angle. The pump used in the motor pump unit is preferably an oscillating piston pump 202. The piston 210 of the oscillating piston pump is connected to the cylinder head via an elastomer sleeve 207. The cylinder consists of a cylinder cover 204 with an intake valve and an outlet valve 206 The compression process carried out by the piston 210 of the pump generates heat, which is preferably dissipated via the cylinder head. In order to be able to dissipate this heat, both the cylinder head and the cylinder cover 204 are made of a metallic material, preferably an aluminum injection molding. The basic cylinder housing 208, on the other hand, consists of a plastic material since no heat dissipation is required. The air sucked out of the housing of the cartridge is compressed by the piston 210 of the pump and directed via the outlet valve 206 into a pressure hose 220 which leads into the canister of the pressure sprayer which is connected to the cartridge. The pressure hose is made of silicone, PU or PVC. The pressure hose 220 itself is connected to the container by means of a pressure nipple 222. The compressed air is fed via the pressure hose 220 and the pressure nipple 222 into the pressure tank of the pump spray device. The inlet valve of the pump only opens when compressed air flows towards the nipple. This enables the pressure in the connected container of the pressure sprayer to be maintained even when the pump is switched off. In addition to the pressure hose 220, another hose 230 is also provided, which connects a pressure sensor 221 to another nipple 232, which leads into the container (not shown). The additional hose 230 can also be identical to the pressure hose 220 . This arrangement ensures that the pressure in the container is measured by the pressure sensor 221 . The arrangement of the pressure sensor 221 on the circuit board 201 goes out Figure 3b who like Figure 3a shows a sectional view of the housing. Same components as in Figure 3a are given the same reference numbers. Next to the pressure sensor 221, the circuit board also includes all of the control electronics for evaluating the pressure measurement and corresponding control of the electric pump for maintaining a constant pressure in the container (not shown), preferably in the range of 1 bar to 3 bar. In addition to the control electronics for the pump, the circuit board also includes the electronics for the display device, which can be used, for example, to set a predetermined pressure. The pressure sensor 221 sits on the board 201, preferably on the back of the control panel with the display (not shown). The pressure sensor is connected to the housing at the tank opening via hose 230 and allows the pressure in the tank to be determined. As previously described, as the spray liquid flows out, the air pressure in the container drops. This pressure loss is detected by the pressure sensor 221 and processed by the pressure control as part of the control electronics, which is also arranged on the circuit board 201 in the housing of the insert. As soon as the pressure loss has reached a lower limit, the pressure control switches on the pump and compressed air is pumped through the pump into the container until an upper limit pressure is reached. The controller then switches the pump off again when the actual tank pressure measured by the pressure sensor is above the upper limit value. In the event that more volume is removed from the container, in particular from the pressure container, than can be conveyed as a function of the pressure, a working pressure below the set target pressure is established in the container. The consequence of this is that the pump runs, the pump being designed in such a way that a sufficient volume flow in a pressure range of 1 to 3 bar, here in particular 1.5 to 2.5 bar, is made available for various spray applications and requirements. A pressure of 1.5 to 2.5 bar is typical for crop protection applications. If the insecticides are to be wetted as evenly as possible, the pressure is adjusted so that small droplets are present. The pressure is then in the range of 2.0 to 2.5 bar. The tolerance for switching the pump on and off for a given desired value is preferably in the range of 2 to 20%, preferably 10%.

In the case of herbicides, a larger droplet size should be aimed for, so that the droplets are prevented from drifting. Therefore, the preferred pressure when applying herbicides is in the range of 1.0 to 2.0 bar, preferably about 1.5 bar.

A higher pressure of more than 2 bar up to 3 bar and a corresponding volume flow is required for foam generation. A satisfactory foam quality is achieved in the range from 2 to 2.5 bar, but at least 2 bar.

That from the WO2012/000578 A1 The well-known pressure sprayer with a maximum pressure of 1.5 - 1.6 bar provides sufficient pressure for use in the plant protection area, but the pressure sprayer is unsuitable for foam sprayers. These requirements for foam formation in the foam spray device can be met with the present invention. For this it is necessary to design the pump and in particular the power supply in the form of a powerful lithium battery. 3c shows the progression of the characteristic curve volume flow over the container pressure for a system according to the prior art, such as in FIG WO 2012/000578 A1 described. This characteristic is marked with the reference number 2000. With the system according to the WO 2012/000578 A1 a flow rate of 2 l/min is possible at a pressure of 1.5 bar. At pressures of only 2.0 bar, there is no delivery at all in the prior art, and it is not possible to dispense liquid. With a system according to the invention, significantly larger volume flows of 5 l/min at a pressure of 2.5 bar can be applied in the container. At a pressure of 2.0 bar, at which no more liquid introduced into the container is conveyed in the prior art, the volume flow to be discharged according to the invention is approximately 6 l/min. The characteristic according to the invention is marked with 2010.

Compared to applications with pressure pumps for sprayers according to the prior art as in the WO 2012/000578 A1 A particular advantage of the present invention is the ability to set a desired container pressure via the display on the housing and the control with the aid of the control device. the The pump is designed in such a way that a pressure in the range between 1 and 3 bar can preferably be set, with an adjustability between 1.5 bar and 2.5 bar being particularly preferred. In this way, a sufficient volume flow of the pressure sprayer is guaranteed. With the help of the control, it is possible to keep the pressure in the container constant and thus deliver a constant volume flow of, for example, 5 l/min at a constant pressure of 2.5 bar. The pressure to be kept constant can preferably be set in stages, for example at 1.6 bar, 1.8 bar, 2.0 bar. The control is now such that, for example, a pressure of 2.0 bar is set. If the pressure value drops by 10% to 1.8 bar, for example, when the spray is applied, then when the pressure sensor 221 on the circuit board 201 detects a pressure of 1.9 bar, the pump in the form of a pendulum piston pump 202 is activated and the pressure in the Container increased to the set pressure of 2.0 bar. This ensures that the volume flow to be applied is always in the range of 6 l/min.

In figure 4 1 is a plan view of the housing of the insert with the memory device attached. The same components as in the previous figures are given the same reference numbers. It can be clearly seen in figure 4 , the display 106 and the insert control panel, which shows the inserted tank pressure in bar or PSI. The display is switched off using the button 400. The button 402 allows the pressure to be preset, preferably in 0.1 bar increments via the buttons 404, 406. It is also provided that the device preferably shows the battery charge status for a time when it is switched on from 0.5 to 10 seconds, in particular 3 to 6 seconds.

To protect the motor against blocking, it can be provided that a reverse mode is implemented in the motor. As a result, the motor is prevented from blocking if the piston position is unfavorable by operating it in reverse mode, ie the motor runs backwards for a short time and then restarts. The motor is activated into reverse mode when the motor current exceeds a certain value.

The storage device 500 arranged on the side of the housing, in particular the accumulator, preferably the Li-ion accumulator, is very popular figure 4 to see. The storage device, in particular the accumulator 500, snaps into the provided holder with slide rails in a form-fitting manner and can be removed again for recharging by simply pressing a button on the storage device. The accumulator can be exchanged very easily due to the ease of use via the slide rails on the housing, which allow the accumulator or the storage device to be slid on until the contacts are connected to the storage device.

The storage devices used, in particular accumulators, have a nominal voltage of 18V. Accumulators with different capacities between 1.5 and 8 Ah can be used. With a capacity of 2.5 Ah, the theoretical usage capacity for one battery charge is approx. 60-80 liters of liquid that can be sprayed. The advantage of these accumulators is that they can also be used for other compatible electronic devices.

It is particularly preferred if the accumulator is provided with an additional protective cover in order to protect the electrical connection of the accumulator to the housing against the ingress of moisture.

In figure 5 a pressure sprayer with the insert 1000 according to the invention is shown. The container 1100 in the insert 1000 according to the invention with the electric pump according to the invention can be clearly seen.

The container 1100 of the pressure sprayer is provided with a carrying strap 1102 . Also clearly visible is the pressure lance 1104 attached to the container of the pressure sprayer, with which the liquid in the container can be discharged. Furthermore, the use with the pump also includes a carrying handle 1010. If there is no carrying strap 1002, this can be done Pressure sprayer can be carried alone with the carrying handle 1010. The carrying handle is designed in such a way that the carrying handle is also able to take the weight of the filled container.

With the invention, a pressure sprayer with an electric pump is specified for the first time, in which the electrical supply device can be exchanged in a simple manner without, for example, pressure having to be released from the container. Furthermore, the use of the pressure sprayer according to the invention is characterized in that a container pressure can be set and maintained with the aid of the control even when liquid is being discharged from the container of the pressure sprayer.

The invention includes aspects disclosed in subsequent sentences forming part of the description according to J 15/88, but not claims

sentences

1. 1. Pressure sprayer (1) with
   • a pressure vessel (1100),
   • an electric pump (200),
   • an electrical storage device (500) for supplying energy to the electric pump (200), with the electric pump (200) building up a container pressure in the interior of a pressure container,
   • characterized in that
   • the electrical storage device (500) is arranged outside the interior of the pressure vessel (1100), preferably laterally on the outer wall of the pressure vessel or laterally on the housing (100) of an insert for the pressure spray device, the insert comprising the electric pump.
2. 2. pressure sprayer according to sentence 1,
   characterized in that
   the pressure spray device comprises at least one pressure sensor, which is particularly preferably provided in the housing of the insert.
3. 3. Pressure sprayer according to any one of clauses 1 to 2
   characterized in that
   the electric pump is a pendulum piston pump.
4. 4. Pressure sprayer according to at least one of sentences 1 to 3,
   characterized in that
   the pressure spray device, in particular the insert for the pressure spray device, comprises an outlet valve (206) and a pressure hose (210) and the air compressed by a piston of the pump is fed via the outlet valve (206) into the pressure hose (210).
5. 5. pressure sprayer, according to at least one of sentences 1 to 4,
   characterized in that
   the pressure vessel (1100) includes a pressure nipple (222) connected to the pressure hose (210).
6. 6. pressure sprayer, according to at least one of sentences 1 to 5,
   characterized in that
   • the pressure sprayer (1) includes a pressure regulator,
   • in which an upper limit value is preferably set in stages, preferably of 1.6 bar, 1.8 bar, 2.0 bar.
7. 7. pressure sprayer, according to at least one of sentences 1 to 6,
   characterized in that
   the pressure control when falling below a lower limit value, which is preferably the upper limit value reduced by a hysteresis, preferably of 5%, puts the pump into operation and/or puts it out of operation when the limit value, which is preferably set in stages, is exceeded.
8. 8. Pressure sprayer, according to at least one of sentences 1 to 7,
   characterized in that
   the pressure range in which the upper limit is set is between 1 and 3 bar, preferably 1.5 and 2.5 bar.
9. 9. Pressure sprayers according to at least one of sentences 1 to 8,
   characterized in that
   the pump includes a reverse mode.
10. 10. pressure sprayer according to at least one of sentences 1 to 9,
    characterized in that
    the housing (100) of the insert comprises a carrying handle (1010) which is designed in such a way that it bears the weight of the filled container picks up.
11. 11. pressure sprayer according to one of sentences 1 to 10,
    characterized in that
    the insert includes a housing (104), the weight being interchangeable so that the insert is adaptable to containers with different threads.

Claims (15)

Pressure sprayer (1) with a pressure vessel (1100), an electric pump (200), an electrical storage device (500) for supplying energy to the electric pump (200), with the electric pump (200) building up a container pressure in the interior of a pressure container, whereby the electrical storage device (500) is arranged outside the interior of the pressure vessel (1100), preferably on the side on the outer wall of the pressure vessel or on the side on a housing (100) of an insert for the pressure spray device, the insert comprising the electric pump, characterized in that the insert comprises a display (106) with a button (404, 406) for setting a pressure in the range of 1 to 3 bar, preferably 1.5 bar to 2.5 bar, preferably in 0.1 bar increments, and a pressure sensor (221 ) and a controller that switches the electric pump on and off depending on the tank pressure, which is determined by the pressure sensor (221), so that the pressure set on the display (106) is maintained. Pressure sprayer according to claim 1,
characterized in that
the pressure sensor is arranged in the housing of the insert, in particular on a circuit board (201). Pressure sprayer according to claim 2,
characterized in that
the circuit board (201) next to the pressure sensor (221) as part of the regulation, the control electronics for evaluating the pressure measurement and controlling the electric pump to maintain the on the display set pressure in the container includes. Pressure sprayer according to one of Claims 1 to 3
characterized in that
the electric pump is a pendulum piston pump. Pressure sprayer according to at least one of claims 1 to 4,
characterized in that
the pressure spray device, in particular the insert for the pressure spray device, comprises an outlet valve (206) and a pressure hose (210) and the air compressed by a piston of the pump is fed via the outlet valve (206) into the pressure hose (210). Pressure sprayer according to at least one of claims 1 to 5,
characterized in that
the pressure vessel (1100) includes a pressure nipple (222) connected to the pressure hose (210). Pressure sprayer according to at least one of claims 1 to 6,
characterized in that
the pressure control an upper Limit includes, where the upper limit can be set in stages, preferably from 1.6 bar, 1.8 bar, 2.0 bar. Pressure sprayer according to at least one of claims 1 to 7,
characterized in that the pressure control includes an internal limit value and the pressure control is designed such that when falling below a lower limit value, which preferably reduces the upper limit value by a hysteresis, very preferably in the range of 2% to 20%, preferably 10%, the pump is put into operation and/or at Exceeding the upper limit value, which is preferably set in stages, is put out of operation. Pressure sprayer according to at least one of claims 1 to 8,
characterized in that
the pressure range in which the upper limit is set is between 1 and 3 bar, preferably 1.5 and 2.5 bar. Pressure sprayers, according to at least one of claims 1 to 9, characterized in that
the pump includes a reverse mode. Pressure sprayer according to at least one of claims 1 to 10,
characterized in that
the housing (100) of the insert comprises a carrying handle (1010) which is designed in such a way that it takes up the weight of the filled container. Pressure sprayer according to one of claims 1 to 11,
characterized in that
the insert includes a housing (104), the weight being interchangeable so that the insert is adaptable to containers with different threads. Pressure sprayer according to any one of claims 1 to 12
characterized in that
Electrical contacts (110) are arranged laterally on a wall (108) of the housing of the insert, into which the outlets of the electrical storage device (500) for the energy supply engage, and slide rails (112) are provided for guiding and sliding the electrical storage device onto the contacts (110 ). Pressure sprayer according to one of claims 1 to 3,
characterized in that
the electrical storage device comprises a lithium-ion battery, in particular with a capacity of 1.5 Ah to 8 Ah, preferably 2.5 Ah. Pressure sprayer according to one of claims 1 to 14,
characterized in that
the electrical storage device, in particular the lithium-ion battery, includes a protective cover which is designed in such a way that electrical connections of the electrical storage device are protected from moisture entering.

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