PRESSURE SPRAYER

Description

[0001] 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, wherein the electric pump builds up a container pressure in the interior of the container.

[0002] Pressure sprayers for different applications have become known from a variety of publications.

[0003] From DE 94 15 691.3 a pressure sprayer, in particular a hand-held fire extinguisher or crop protection sprayer, has become known, which comprises a spray container which can be filled with pressurised gas and a hose connected to the spray container with a one-sided valve for dispensing the spray.

[0004] DE-U 84 20 572 discloses a portable pressure sprayer which is distinguished by the fact that the pressure container for the spraying agent is provided with an upper filling opening which can be closed by an insertable hand pump, as well as openings for a pressure indicator and for a pressure relief valve and a connection opening for a spray hose. A disadvantage of all of the pressure sprayers mentioned above was that the pressure in the pressure sprayer, which was necessary to dispense the spraying agent and is preferably in the range of 1.5 to 1.6 bar, was built up in particular with the aid of a hand pump. During spraying, the pressure decreases when the spraying agent is dispensed. Therefore, in the prior art, after a certain period of time during which the spraying agent was dispensed, the pressure in the pressure container would have to be increased again by pumping it again by hand.

[0005] This was particularly time-consuming for large volumes.

[0006] US Pat. No. 7,207,500 B2 discloses a pressure sprayer in which an electric motor drives the pump. The pump is located in the upper part of the pressure spray container, and rechargeable battery cells are provided in the lower part of the housing, which extends into the liquid tank. Since the battery cells located there cannot be removed during operation, the process must be interrupted when charging or replacing the batteries, either until the empty battery cells are recharged or replaced.

[0007] The pressure spray device known from WO 2012 / 000578 A1 is constructed in a similar way, comprising 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 are arranged in a receiving housing projecting beneath the pump and into the pressure vessel, analogous to US 7,207,500 B2.

[0008] Similar principles are also demonstrated in EP 1949972 A1 and EP 2588247 B1. In EP 1949972 A1, the system is designed so that the battery cells can be removed by dismantling part of the pressure vessel. EP 2588247 B1 solves this problem by providing a removable battery compartment that extends into the pressure vessel housing.

[0009] All of the electrical systems mentioned above have a pressure switch that switches the motor off and on again when a specified pressure is reached.

[0010] DE 10 2010 017 988 discloses a pressure sprayer for dispensing a spray agent with a pressure vessel. The pressure vessel includes a compressor connection and can be connected to a compressor. The compressor feeds gas into the pressure vessel, and the pressure required to dispense the spray agent is built up in the vessel. The pressure in the pressure vessel can be adjusted and, if necessary, maintained constant via an external device.

[0011] Instead of NiMH batteries, as described, for example, in WO 2012 / 000578 A1, it is also possible to use a lithium-ion battery as the power source for the electric pump. For example, a sprayer with a lithium-ion (Li-ion) battery is known from US 10,137,465 B2. The lithium-ion (Li-ion) battery according to US 10,137,465 B2 is removably mounted on the front of the water tank of the sprayer according to US 10,137,465 B2. The sprayer according to US 10,137,465 B2 is connected to the water outlet of the pump.

[0012] US 5,931,207 A discloses a handheld compressor used for spraying liquids from a tank or for inflating inflatable objects. The compressor is powered by a storage device, particularly a battery, attached to the compressor housing. US 5,931,207 A does not show how the storage device can be replaced quickly and easily. Likewise, US 5,931,207 A does not show how the pressure must be regulated to deliver a constant flow rate.

[0013] US Pat. No. 6,109,548 A also shows a pressure sprayer with an electrically driven pump. US Pat. No. 6,109,548 A also does not explain how the storage device can be replaced quickly and easily.

[0014] US 5 409 167 A, US 2005 / 0 045 75 A and US 2016 / 0 243 570 A also show spraying devices for spraying liquids with a storage device as an energy source.

[0015] Only US 2016 / 0 243 570 A shows a sprayer with a system for regulating the application pressure for minor deviations of 0.1 psi to 1.0 psi. The system known from US 2016 / 0 243 570 A starts the compressor when deviations from the preselected pressure occur. As previously mentioned, the deviations are between 0.1 psi and 1.0 psi. The compressor of 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.

[0016] In tests with pressures of up to 30 psi using a hand pump, US 2016 / 0 243 570 A demonstrates a good spray pattern, although drops also occur outside the spray band. This drift and uncontrolled spray behavior are avoided in US 2016 / 0 243 570 A by using lower pressures, preferably less than 1.5 bar, in particular 1.37 bar and below. The compressor prototype disclosed in US 2016 / 0 243 570 is only capable of generating a maximum pressure of 10 psi, which is significantly lower than 1.37 bar. US 2015 / 251204 A1 discloses another pressure spray device according to the prior art.

[0017] The disadvantage of all pressure sprayers with electric pumps in the prior art was that replacing the energy sources was time-consuming and an easy replacement of the batteries was not possible.

[0018] Another disadvantage of the prior art was that the pressure in the container dropped during the application of the liquid. This pressure reduction resulted in a change in the volume flow of the liquid being sprayed. Another disadvantage was that the preset pressure was too low, and the application rate could not be precisely adjusted via the pressure. Furthermore, spray drift could only be avoided at pressures below 1.37 bar.

[0019] The object of the invention is therefore to overcome these and other disadvantages of the prior art.

[0020] This object is achieved by a pressure spray device according to claim 1. Further developments of the invention are the subject of the subclaims.

[0021] In the electrical storage device according to the invention, the accumulator is arranged outside the interior of the container laterally on the outer wall of the container or laterally on the carrying handle of an insert for the pressure sprayer, wherein the insert comprises the electric pump.

[0022] The pressure sprayer according to the invention is characterized in that a pressure in the range of 1 to 3 bar, in particular more than 1.37 bar to 3 bar, preferably 1.5 bar to 2.5 bar, can be set, preferably in 0.1 bar increments. Furthermore, the pressure sprayer has a sensor and a control system that switches the electric pump on and off depending on the container pressure, which is determined by a pressure sensor, so that the pressure set on the display is maintained.

[0023] The adjustability of the pressure in the range 1 to 3 bar allows the use of the pressure sprayer according to the invention in four main areas of application.

[0024] One application is against insecticides and fungicides. When using fungicides and insecticides, plants in the garden are preferably sprayed from the underside of the leaves. Pressures are preferably in the range of 2 to 2.5 bar, and the flow rate is between 500 and 1500 ml / min. In this range, in combination with a 1 mm hollow cone nozzle, the droplets are fine enough to wet the undersides of the leaves. Pressures that are too low, as in the current technology, 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.

[0025] Another application is herbicide spraying. With herbicides used to eliminate weeds, wind drift of the droplets is undesirable, as they can then contaminate crops. When used with a suitable nozzle (the nozzle manufacturer specifies suitable combinations of nozzle diameter and system pressure), low-drift spraying is possible at a pressure of approximately 1.5 bar, particularly in the range of 1.37 bar to 1.6 bar.

[0026] In addition to spraying pesticides, it is also possible to spray disinfectants or cleaning agents. When spraying disinfectants on surfaces, such as in rooms, comprehensive wetting of the surfaces is best achieved, preferably with small droplets. Applying these agents at pressures of more than 2 bar, especially 2.5 bar, and a flow rate of 2.3 l / min.

[0027] The generation of foam using 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. With the pressure sprayer according to the invention, the foam can be sprayed continuously, with the pump delivering a sufficient flow rate without the pressure in the container falling below 2 bar during continuous operation. Regarding foam formation, reference is made to EP 2 308 603 A1, the disclosure of which is incorporated in its entirety into the present application.

[0028] The pump is preferably housed in a housing that is part of the insert. Particularly easy replacement is enabled if a fastening device is provided on the container or on the housing that is part of the insert, which allows the storage device, in particular the accumulator, to be latched into place. It is particularly preferred if the accumulator is arranged on the outside of the container or on the wall of the housing that accommodates the pump. The accumulator can preferably be inserted into slide rails until the storage device or accumulator latches into place and the voltage supply is established via electrical contacts from the inserted storage device or accumulator to the pump.

[0029] Instead of the previously used nickel-metal hydride cells as described in WO 2012 / 000578 A1, the spray device according to the invention uses lithium-ion batteries as the storage device, which can also be used for other applications in households or power tools. To protect the electrical connection between the storage device or battery and the housing against water ingress, it is advantageous to surround the batteries or storage device with a protective sheath, which also acts as a seal against the pump housing.

[0030] In order to ensure that the pressure required for the spraying process is always present in the container of the pressure sprayer, the pressure sprayer according to the invention is provided with pressure sensors which detect the pressure loss as spray liquid flows out of the container and feeds this information to a pressure control system. The pressure sensors are preferably provided in the housing of the insert which houses the electric pump. As soon as the pressure loss measured by the pressure sensor reaches a lower limit, the pressure control system switches the electric pump on. The pump then pumps compressed air into the container of the pressure sprayer until an upper limit is reached. The pressure control system 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 container of the pressure sprayer.

[0031] If the tolerance specified for switching on and off is too narrow, as is the case in the prior art in the form of US 2016 / 0 243 570 A, for example, this will result in the pump constantly starting and switching off. This has the disadvantage of causing very high wear on the pump. It is therefore preferably provided that the tolerance for switching off the pump is preferably in the range 2 to 20%, preferably 10%, in particular 5%. This means that, for example, with a specified target pressure of 2 bar, the pump will start again with a tolerance of 20% if the pressure falls below 1.6 bar. A particularly preferred tolerance range to prevent pump pulsation is a tolerance of 10%, i.e. with a target pressure of 2 bar, the pump would start again when the pressure falls below 1.8 bar. The tolerance is also referred to as hysteresis, by which a lower limit can be undercut before the pump is put into operation.In the above example, the target pressure is an upper limit, for example 2.0 bar, and the lower limit determined with a hysteresis or tolerance of 10% is a pressure of 1.8 bar.

[0032] The pressure, which is preferably kept constant within a tolerance within a specified pressure range, ensures a constant volume flow.

[0033] This ensures that unnecessary amounts of spray liquid, especially pesticides, are not released into the environment. Pressure also determines the droplet size of the spray mist. If the pressure is too high, the droplets are smaller and can therefore drift in windy conditions and contaminate plants that are not intended to be sprayed. Droplets that are too large, which form at low pressure, prevent the plant leaves from being adequately wetting. When applying insecticides, it is advantageous to adjust the pressure so that the droplets are small. This creates a fine mist that ensures complete wetting of the leaves. The preferred pressure for applying insecticides is between 2 and 2.5 bar.

[0034] For herbicides, a larger droplet size is desirable to prevent drift. The pressure is preferably in the range of 1 to 2 bar, preferably approximately 1.5 bar, and in particular not exceeding 1.5 bar.

[0035] For application in foam generation in the cleaning of motor vehicles, for example, a constant pressure is required so that the set foam quality remains constant throughout the foaming process. To provide satisfactory foam quality, the pressure is in the range of 2 to 2.5 bar, but at least 2 bar, since foam formation does not occur below 2 bar. For even wetting, it is advantageous if a constant pressure is maintained. A pressure sprayer for dispensing foam with a hand pump is described, for example, in EP 2 308 603 A1, the disclosure content of which is incorporated in full into the present application. In particular, EP 2 308 603 A1 describes the parameters that are decisive for good foaming.

[0036] When applying formwork oil to formwork, for example, as a release agent for concrete, different working pressures must be set depending on the viscosity of the oil. A constant pressure can achieve a uniformly wetted surface in this type of application.

[0037] If more air is taken from the container than the pump can deliver, the working pressure is below the set target pressure and the pump runs through.

[0038] The pump is preferably designed such that a sufficient volume flow is provided for various spray applications and requirements in a pressure range between 1 and 3 bar, particularly preferably between 1.5 and 2.5 bar. In particular, the pressure is set on a control panel, preferably an indicator device, in particular a display, in the range 1.5 to 2.5 bar. To prevent pulsation of the pump, provision is made for the pump to be switched back on if deviations in the range 2 to 20%, preferably 10%, of the target pressure occur, e.g. if the pressure falls below an internal limit value. With such a tolerance, there is a sufficient period of time between switching the pump on and off, so that wear is minimized.

[0039] 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 using a rubber diaphragm. The pendulum piston pump thus combines the advantages of a diaphragm pump with those of a piston pump. Advantageously, the pendulum piston pump runs more smoothly than a piston pump and does not require lubrication. It is particularly preferred if the air sucked in from the housing is compressed by the pump's piston and fed via an outlet valve into a pressure hose. The pressure hose, in turn, opens into 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 is adjusted. Since the pressure sensor measures the pressure in the container, the electric pump and the control orThe pressure in the pressure sprayer can preferably be set in the range of 1 to 3 bar using the control unit. The pressure sensor is preferably located on a circuit board on the back 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 more easily in the relatively small available installation space than, for example, with rigid 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 container via this nipple. Furthermore, an inlet valve is preferably provided between the pump housing and the hose, which only opens when compressed air flows towards the nipple and thus into the container.This makes it possible to maintain the internal pressure in the tank even when the pump is switched off. The pressure sensor is preferably connected to the pressure nipple via the pressure hose or another hose.

[0040] To protect the motor from jamming, it is advantageous if the pump can be operated in reverse mode. High reservoir pressures and an unfavorable piston position can cause the motor to jam upon starting. If the pump is equipped with a reverse mode, this ensures that the motor runs briefly in reverse and immediately restarts. For this purpose, the motor current is measured and, if a certain motor current value is exceeded, the reverse current is activated. This ensures that the motor starts quickly and smoothly, even in unfavorable positions.

[0041] The invention will now be described by way of example with reference to the drawings.

[0042] They show: Fig. 1: A pressure sprayer according to the prior art. Fig. 2: A housing of an insert with an electric pump for a pressure sprayer. Fig. 3a: A first sectional view of the housing of the insert with a concealed circuit board. Fig. 3b: Another sectional view of the housing of the insert with a circuit board. Fig. 3c: Characteristic curve of volume flow as a function of tank pressure. Fig. 4: Housing of the insert with an attached accumulator. Fig. 5: Pressure sprayer with an insert according to the invention and an electric pump.

[0043] Figure 1 shows a pressure sprayer or pressure spray device 1 according to the prior art in a first embodiment with a hand pump in section. Fig. 1The 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 interior of the pressure vessel 3 with spray liquid. The spray liquid can be filled up to a maximum of the fill level 11. Preferably, in an embodiment according to Fig. 1 the volume V spray of the spray agent at maximum fill 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 agent determines the application time of the spray agent after pressure has been built up in the pressure sprayer.

[0044] In the illustrated embodiment 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 Fig. 1The hand pump shown here is replaced by an electric pump, which is preferably used in an application such as in the Figures 2 to 4 The pressure is then built up instead of manually pumping using the Fig. 2 to Fig. 4 The electric pump shown in the insert according to the invention is integrated into the insert. The insert with electric pump can also be connected to the pressure vessel via a screw connection like the hand pump according to Figure 1 be connected

[0045] By discharging the spray agent, the pressure built up in the container by the hand pump or the electric pump is reduced. After a certain period of time, the pressure in the pressure container 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 agent liquid in the pressure container to be discharged again. The larger the gas cushion is in comparison to the volume of the spray solution or spray agent liquid, the longer the period can be after which the pressure must be increased again by re-pumping. According to the invention, it is provided that by constantly monitoring the pressure in the container and by a control system that switches the electric pump on and off depending on the container pressure, which is determined by the pressure sensor, a constant pressure in the container can be set, preferably in the range of 1 to 3 bar, which is not possible with a hand pump.With the hand pump, a set pressure decreases continuously.

[0046] Figure 2 shows the housing 100 of the insert with the electric pump, which is used instead of the hand pump, as in Fig. 1 shown, can be inserted into the pressure container. The housing 100 of the insert comprises a carrying handle 102, as well as a thread, in particular a screw threaded connector 104 for screwing the insert into the container of the pressure sprayer. The carrying handle 102 is designed such that it is able to support the weight of the filled container. The screw threaded connector 104 is interchangeable. This means that the pump can also be adapted for other sprayers with different threads and can be connected to a wide variety of containers. All necessary settings for the pressure sprayer can be made on the display device or display 106 of the housing in which the pumps are housed. As clearly shown in Figure 2As 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 easily connected to the storage device or the accumulator by sliding the storage device onto slide rails 112 that are attached to the side of the housing. The electrical contacts 110 then engage in corresponding recesses in the electrical storage device, thus establishing an electrical connection between the accumulator and the housing and ensuring the electrical supply to the pump arranged in the housing. Because the storage device can be easily removed from the side wall via the slide rails 112 and reattached thereto, the storage device can be changed quickly and easily without the container having to be opened to change the accumulator.

[0047] Figure 3ashows a sectional view of the housing 110 of the insert with concealed circuit board 210 of the control unit. The same components as in Figure 1are assigned the same reference numerals. The unit or housing 110 comprises the electric pump. The so-called motor pump unit 200 with the electric pump is arranged at an angle in the housing 110. The pump used in the motor pump unit is preferably a pendulum piston pump 202. The piston 210 of the pendulum 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 exhaust valve 206. The compression process carried out with the aid of 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 cylinder base housing 208, on the other hand, is made of a plastic material since no heat dissipation is required.The air sucked from the insert housing is compressed by the pump's piston 210 and fed via the outlet valve 206 into a pressure hose 220, which leads into the pressure sprayer's container connected to the insert. The pressure hose is made of silicone, PU, ​​or PVC. The pressure hose 220 itself is connected to the container using a pressure nipple 222. The compressed air is fed into the pressure container of the pump sprayer via the pressure hose 220 and the pressure nipple 222. The pump's inlet valve only opens when compressed air flows toward the nipple. This allows 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, a further hose 230 is provided, which connects a pressure sensor 221 to another nipple 232, which leads into the container (not shown). The further 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 is shown in . Fig. 3b , which like Fig. 3a a cross-sectional view of the housing. The same components as in Fig. 3aare assigned the same reference numerals. In addition to the pressure sensor 221, the circuit board also includes all of the control electronics for evaluating the pressure measurement and correspondingly controlling the electric pump to maintain 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 with the help of which, for example, a predetermined pressure can be set. The pressure sensor 221 is located on the circuit 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 container opening via the hose 230 and allows the pressure in the container to be determined. As previously described, the air pressure in the container drops when the spray liquid flows out.This pressure loss is detected by pressure sensor 221 and processed by the pressure control as part of the control electronics, which is also located in the insert housing on circuit board 201. As soon as the pressure loss reaches a lower limit, the pressure control switches the pump on, and compressed air is pumped into the tank until an upper limit pressure is reached. Then, if the actual tank pressure measured by the pressure sensor is above the upper limit, the control switches the pump off again. In the event that more volume is withdrawn from the tank, particularly from the pressure tank, than can be pumped depending on the pressure, a working pressure below the set target pressure is established in the tank.This then causes the pump to run continuously. The pump is designed to provide a sufficient flow rate for various spray applications and requirements within a pressure range of 1 to 3 bar, in this case specifically 1.5 to 2.5 bar. A pressure of 1.5 to 2.5 bar is typical for crop protection applications. If the most even wetting possible is required for insecticides, the pressure is set to produce small droplets. The pressure is then in the range of 2.0 to 2.5 bar. The tolerance for switching the pump on and off at a given setpoint is preferably in the range of 2 to 20%, preferably 10%.

[0048] For herbicides, a larger droplet size is desirable to prevent drift. Therefore, the preferred pressure for applying herbicides is in the range of 1.0 to 2.0 bar, preferably approximately 1.5 bar.

[0049] Foam generation requires a higher pressure of over 2 bar up to 3 bar and a corresponding flow rate. Satisfactory foam quality is achieved in the range of 2 to 2.5 bar, but at least 2 bar.

[0050] The pressure sprayer known from WO2012 / 000578 A1 delivers a maximum pressure of 1.5 - 1.6 bar, which is sufficient for use in crop protection, but is unsuitable for foam sprayers. The present invention allows these requirements for foam formation in the foam sprayer to be met. This requires the pump and, in particular, the power supply in the form of a high-performance lithium-ion battery to be designed accordingly. Fig. 3cshows the course of the characteristic curve volume flow against the tank pressure for a system according to the prior art, as described, for example, in WO 2012 / 000578 A1. This characteristic curve is marked with reference number 2000. With the system according to WO 2012 / 000578 A1, a volume flow of 2 l / min is possible at a pressure of 1.5 bar. At pressures of only 2.0 bar, no conveying takes place at all in the prior art, and dispensing of liquid is not possible. With a system according to the invention, significantly larger volume flows of 5 l / min can be dispensed at 2.5 bar in the tank. At a pressure of 2.0 bar, at which in the prior art no liquid is conveyed into the tank at all, the volume flow to be dispensed with the invention is approximately 6 l / min. The characteristic curve according to the invention is marked with 2010.

[0051] Compared to applications with pressure pumps for spray devices according to the prior art, such as in WO 2012 / 000578 A1, a particular advantage of the present invention is the adjustability of a desired container pressure via the display on the housing and the control with the aid of the control device. The pump is designed so that a pressure in the range between 1 and 3 bar can preferably be set, with adjustability between 1.5 bar and 2.5 bar being particularly preferred. In this way, a sufficient volume flow of the pressure sprayer is ensured. With the aid of the control, it is possible to keep the pressure in the container constant and thus apply a constant volume flow of, for example, 5 l / min at a constant pressure of 2.5 bar. The setting of the pressure to be kept constant can preferably be made in steps, for example at 1.6 bar, 1.8 bar, 2.0 bar. The control is now carried out such that, for example, a pressure of 2.0 bar is set.If the pressure drops by 10% to 1.8 bar, for example, due to the application of the spray agent, the pump, in the form of a pendulum piston pump 202, is activated upon detection of a pressure of 1.9 bar by the pressure sensor 221 on the circuit board 201, and the pressure in the container is increased to the set pressure of 2.0 bar. This ensures that the volume flow to be applied always remains in the range of around 6 l / min.

[0052] In Figure 4 A top view of the housing of the insert with the storage device attached is shown. The same components as in the previous figures are designated with the same reference numerals. It is clearly visible in Figure 4, the display 106 and the control panel of the insert, on which the used container pressure is displayed in bar or PSI. The display is switched off using button 400. Button 402 allows the pressure to be preset, preferably in 0.1 bar increments using buttons 404, 406. Furthermore, it is provided that the device displays the battery charge level upon switching on, preferably for a period of 0.5 to 10 seconds, in particular 3 to 6 seconds.

[0053] To protect the motor from stalling, a reverse mode can be implemented. This prevents the motor from stalling in the event of an unfavorable piston position by operating it in reverse mode, meaning the motor briefly runs backward and then restarts. The motor's reverse mode is activated when the motor current exceeds a certain value.

[0054] The storage device 500 arranged laterally on the housing, in particular the accumulator, preferably the Li-ion accumulator, is well Figure 4 The storage device, in particular the accumulator 500, snaps into the provided holder with slide rails and can be removed for recharging by simply pressing a button on the storage device. Due to its easy insertion via the slide rails located on the housing, which allow the accumulator or storage device to be slid on until the contacts are connected to the storage device, the accumulator can be replaced very easily.

[0055] The storage devices used, especially the rechargeable batteries, have a nominal voltage of 18V. Batteries of various capacities between 1.5 and 8 Ah can be used. With a capacity of 2.5 Ah, the theoretical usable capacity for one battery charge is approximately 60-80 liters of sprayable liquid. Another advantage of these batteries is that they can also be used for other compatible electrical devices.

[0056] 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 from the ingress of moisture.

[0057] In Figure 5 A pressure sprayer with the insert 1000 according to the invention is shown. Clearly visible is the container 1100 into which the insert 1000 according to the invention is located, along with the electric pump according to the invention.

[0058] The container 1100 of the pressure sprayer is equipped with a carrying strap 1102. Also clearly visible is the pressure lance 1104 attached to the container of the pressure sprayer, which can be used to dispense the liquid contained in the container. Furthermore, the insert with the pump also includes a carrying handle 1010. If no carrying strap 1002 is present, the pressure sprayer can be carried using the carrying handle 1010 alone. The carrying handle is designed to support the weight of the filled container.

[0059] The invention provides, for the first time, a pressure sprayer with an electric pump in which the electrical supply unit can be easily replaced without, for example, having to release pressure from the container. Furthermore, the use of the pressure sprayer according to the invention is characterized by the fact that a container pressure can be set and maintained with the help of the control system even when liquid is being dispensed from the container of the pressure sprayer.

Claims

1. Pressure spray device (1) having a pressure container (1100), an insert which comprises an electric pump (200), an electric storage device (500) for supplying energy to the electric pump (200), wherein a container pressure is built up in the interior of a pressure container by means of the electric pump (200), wherein the electric storage device (500) is arranged outside the interior of the pressure container (1100), preferably laterally on the outer wall of the pressure container or laterally on a housing (100) of the insert for the pressure spray device, characterized in in that the housing (100) of the insert comprises a screw-threaded connection piece (104) for screwing the insert into the pressure container (100) and furthermore a display (106) with a button (404, 406) for setting a pressure in the range from 1 to 3 bar, preferably 1.5 bar to 2.5 bar, preferably in 0.1 bar steps, wherein the set pressure is shown on the display (106) and the pressure spray device has a pressure sensor (221) and a control system which switches the electric pump on and off depending on the container pressure determined by means of the pressure sensor (221), so that the pressure set on the display (106) is maintained.

2. Pressure spray device 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).

3. Pressure spray device according to claim 2, characterized in that the circuit board (201) comprises, in addition to the pressure sensor (221) as part of the control system, the control electronics for evaluating the pressure measurement and actuating the electric pump to maintain the pressure in the container set on the display.

4. Pressure spray device according to one of claims 1 to 3, characterized in that the electric pump is a pendulum piston pump.

5. Pressure spray device 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 into the pressure hose (210) via the outlet valve (206).

6. Pressure spray device according to claim 5, characterized in that the pressure container (1100) comprises a pressure nipple (222) which is connected to the pressure hose (210).

7. Pressure spray device according to at least one of claims 1 to 6, characterized in that the pressure control comprises an upper limit value, wherein the upper limit value is adjustable in steps, preferably of 1.6 bar, 1.8 bar, 2.0 bar.

8. Pressure spray device according to at least one of claims 1 to 7, characterized in that the pressure control comprises an internal limit value and the pressure control is designed in such a way that when the pressure falls below a lower limit value, which is preferably the upper limit value reduced by a hysteresis, very preferably in the range of 2% to 20%, preferably 10%, the pump is put into operation and / or is put out of operation when the upper limit value, which is preferably set in stages, is exceeded.

9. Pressure spray device according to at least one of claims 1 to 8, characterized in that the pressure range in which the upper limit value is set is between 1 and 3 bar, preferably 1.5 and 2.5 bar.

10. Pressure spray device according to at least one of claims 1 to 9, characterized in that the pump comprises a reverse mode.

11. Pressure spray device 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 to take the weight of the filled container.

12. Pressure spray device according to one of claims 1 to 11, characterized in that the insert comprises a housing (104), wherein the thread is designed to be interchangeable, so that the insert can be adapted to containers with different threads.

13. Pressure spray device according to 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 openings of the electrical storage device (500) for the power supply engage, and slide rails (112) are provided for guiding and sliding the electrical storage device onto the contacts (110).

14. Pressure spray device according to one of claims 1 to 3, characterized in that the electrical storage device comprises a Li-ion accumulator, in particular with a capacity of 1.5 Ah to 8 Ah, preferably 2.5 Ah.

15. Pressure spray device according to one of claims 1 to 14, characterized in that the electrical storage device, in particular the Li-ion accumulator, comprises a protective cover which is designed in such a way that electrical connections of the electrical storage device are protected from moisture ingress.