Hand-held paint sprayer and method for operating a hand-held paint-sprayer

Abstract

The invention relates to a hand-held paint sprayer (1) which has a housing (2) comprising a handle (3), a spray head (4), a fan motor (7), a filter cover (8) having air-supply openings (9), and an air filter (11), wherein the paint sprayer (1) also has a pressure sensor (17) for measuring an air pressure, which pressure sensor is located between the air filter and the fan motor.

Description

[0001] Handheld paint sprayer and method for operating a handheld paint sprayer

[0002] The invention relates to a hand-held paint sprayer according to the preamble of claim 1 and to a method for operating a hand-held paint sprayer according to the preamble of claim 15.

[0003] WO 2023 / 006861 A1 discloses a hand-held paint sprayer which comprises a housing with a handle, a spray head, a blower motor, a filter cover with air supply openings and a filter box with an air filter, wherein the paint sprayer comprises a pressure chamber as a receiving space for the blower motor and wherein the pressure chamber comprises an air inlet and an air outlet. With such paint sprayers there is a fundamental risk that, particularly when operated with a blocked air filter, false air will be sucked in and that the paint sprayer will experience increased wear and / or be damaged and / or will not function optimally due to this unfiltered false air flowing in uncontrolled paths.

[0004] The object of the invention is to propose a handheld paint sprayer and a method for operating a handheld paint sprayer, with which the intake of false air is avoided and the need for changing the air filter can be reliably detected.

[0005] This object is achieved starting from the features of the preamble of claim 1 and 15 by the characterizing features of claim 1 and 15 respectively. Advantageous and expedient developments are specified in the respective subclaims. According to the invention, the handheld paint sprayer comprises a housing with a handle, a spray head, a blower motor and an air filter, wherein the paint sprayer comprises a pressure sensor for detecting an air pressure, wherein the pressure sensor is arranged between the air filter and the blower motor. By arranging the pressure sensor in this way, a change in the air pressure upstream of the blower motor occurring as a result of an increasingly clogged air filter can be detected during operation, so that the need to change the air filter can be signaled or, if necessary, the blower motor can be switched off.This prevents increased wear and damage as a result of a suboptimal operating point and ensures optimal operation of the dye sprayer.

[0006] It can also be provided that the paint sprayer comprises a filter cover with air supply openings and a filter box with the air filter. The paint sprayer comprises a pressure chamber as a receiving space for the blower motor, wherein the pressure chamber comprises an air inlet and an air outlet. As a result, the blower motor is accommodated in the paint sprayer in such a way that it has a defined suction side and a defined pressure side, thus avoiding unwanted secondary flows during operation.

[0007] Furthermore, it can be provided to arrange the filter box with its air filter opposite the air inlet of the pressure chamber, and to form a pre-chamber through the housing between the pressure chamber and the filter box. The pre-chamber has air inlet openings facing an outer surface of the housing, which are covered by the air filter. This optimally positions the air filter and the blower motor relative to each other so that the air flows straight and is not deflected.

[0008] It can also be provided to form an opening in the housing which leads into the pre-chamber, and for the pressure sensor to detect the pressure prevailing in the pre-chamber, whereby the pre-chamber forms an airtight pre-chamber which has air exchange exclusively with the pressure chamber and the filter box. By arranging the pre-chamber in this way between the pressure chamber and the filter box, designing the pre-chamber as an airtight pre-chamber and detecting the air pressure prevailing in the pre-chamber, it is ensured that unadulterated values ​​are recorded for the prevailing air pressure, which are not changed by increasing intake of false air when the air filter becomes clogged.

[0009] Furthermore, it can be provided to arrange the filter box above the pre-chamber in the region of its air inlet openings located above the air inlet. The filter box has an internal volume corresponding to the volume of the air filter. The filter box is formed by the housing and by the filter cover forming a top side of the paint sprayer, and the air supply openings of the filter cover are at least partially opposite the air inlet. This results in a compact design for an intake unit formed by the filter box and pre-chamber, so that the weight of the handheld paint sprayer is kept low.

[0010] It can also be provided to arrange the opening for the pressure sensor in a recess in the housing, which is formed on a rear side of the housing opposite the spray head, wherein the paint spray device comprises a control board, wherein the control board is received and fixed in the recess, wherein the pressure sensor is arranged on the control board and wherein the pressure sensor (17) is arranged in the region of the opening (19), and the control board rests against the housing in such a way that the opening for the pressure sensor is sealed by the control board.This results in a compact design of the paint sprayer, despite the spatial allocation of the control board to the pre-chamber, since the control board takes over the sealing. Furthermore, the pressure prevailing in the pre-chamber is recorded immediately and directly, so that any undesired influence of the measured values ​​by additional components is reliably avoided. Accordingly, the pressure sensor is arranged between the pressure chamber and the filter box in the flow path of the sucked-in air.

[0011] Additionally, it can be provided that the control board is formed around the pressure sensor by at least one additional sealing element. In this case, the sealing element can be formed, in particular, by a sealing ring with preferably elastic properties or an adhesive compound.

[0012] It can also be provided to pivot the filter cover to an operating unit and, when closed, to additionally lock the filter cover to the housing. This ensures that the filter cover is held captive to the housing and also serves to reinforce and stabilize the housing. Furthermore, the air filter is reliably pressed against the pre-chamber, preventing any potential for leakage of air from the filter housing.

[0013] Furthermore, the paint sprayer can be equipped with a control panel, also referred to as the "our interface," where the recess housing the control board is closed by the control panel. This eliminates the need for long connecting cables to the control board, and the control panel also contributes to further stiffening and stabilizing the paint sprayer's housing.

[0014] It may also be provided to form the control unit together with the control board as a single unit, wherein the unit includes an adjustment device comprising a rotary switch and / or button for selecting one of several power levels of the blower motor, and wherein the pressure sensor and the adjustment device are arranged on opposite outer surfaces of the unit. This also promotes a compact design of the paint sprayer.

[0015] Furthermore, the control panel can be equipped with a filter change indicator. By locating the adjustment mechanism and the filter change indicator close together, intuitive operation and handling of the paint sprayer is facilitated, as the user automatically has the filter change indicator in view during the regular process of selecting a power level.

[0016] It may also be provided to equip the paint sprayer with a rechargeable battery to supply the blower motor and to equip the control unit with a

[0017] Equipped with a battery status indicator for this rechargeable battery. This also allows for intuitive operation and handling of the paint sprayer.

[0018] Furthermore, the housing can be designed with a left side shell and a right side shell, which abut each other with congruent contact surface sections to form the housing. This allows the pressure chamber to be easily integrated into the housing without the need to create a sufficiently dimensioned supply channel for its assembly.

[0019] It can also be provided to fix the pressure chamber between the adjacent side shells in the housing, or to form it by the adjacent side shells. In both cases, a reliable, permanent hold of the pressure chamber in the housing is ensured.

[0020] Furthermore, the pre-chamber can be formed by a left pocket in the left side shell and a right pocket in the right side shell. This simplifies the production of the paint sprayer, as no separate assembly of a pre-chamber is required. Furthermore, the pre-chamber can be connected to the pressure chamber by simply joining the two side shells.

[0021] It can also be provided that the left side shell with the left pocket rests against a nozzle of the pressure chamber with a left-hand curved edge section, and that the right side shell with the right pocket rests against the nozzle of the pressure chamber with a right-hand curved edge section, and that a sealing lip is formed on the nozzle and / or on both edge sections. This ensures a reliable seal between the pressure chamber and the pre-chamber, so that the intake of false air in this area is reliably prevented.

[0022] According to the invention, the method for operating a hand-held paint sprayer, in particular a paint sprayer according to at least one of claims 1 to 14 which comprises a control board, comprises the following steps: an air pressure prevailing between an air filter and a blower motor is repeatedly detected by a pressure sensor, a control device of the control board repeatedly calculates a pressure difference from a first air pressure value detected when the blower motor is stationary and a second air pressure value detected when the blower motor is running, when a predefined pressure difference limit value is reached, the user is signaled that the air filter needs to be changed.

[0023] Such a process makes it possible to reliably detect the need for an air filter change.

[0024] It can also be provided that a user can select one of several power levels of the blower motor by means of an adjustment device on the control board, whereby upon reaching a pressure difference limit predefined for the respective set power level, the user is signaled that an air filter change is necessary. This allows the method to reliably detect the need to change the air filter, even in paint sprayers with multiple power levels, regardless of the power level being used. It is also provided that the first air pressure values ​​and the second air pressure values ​​are measured by means of the pressure sensor in an interior space of a prechamber, which is arranged between a filter box with the air filter arranged therein and a pressure chamber with the blower motor arranged therein.This allows the pressure sensor to directly and unadulteratedly measure the prevailing air pressure in the prechamber, eliminating the need for additional sealing components. A single pressure sensor is sufficient for monitoring purposes.

[0025] It can also be provided to arrange the pressure sensor on the control board and to be held by the control board in an opening in a wall of the pre-chamber in such a way that the opening is sealed by the control board. The direct arrangement of the pressure sensor on the control board simplifies installation.

[0026] It can also be provided that the first air pressure value, by which the air pressure is detected when the blower motor is stopped, is detected in a time window that lies between the actuation of a main switch of the paint sprayer and the starting of the blower motor. In this case, it is then provided in particular that the starting of the blower motor is controlled in such a way that the control device of the control board only enables the start of the blower motor once the first air pressure value has been detected. In this case, the first air pressure value is detected by at least one measurement and in particular several consecutive measurements. This ensures that a first air pressure value is always present.

[0027] For the purposes of the invention, false air is understood to mean air which is sucked in by the blower motor via unintended paths and without prior filtering by the air filter.

[0028] Further details of the invention are described in the drawing using a schematically illustrated embodiment. Herein:

[0029] Figure 1: a perspective view of a hand-held paint sprayer according to the invention;

[0030] Figure 2: a detailed view of the paint sprayer shown in Figure 1, with components attached to the housing removed;

[0031] Figure 3 : another detailed view of the dye sprayer shown in Figure 1 in exploded view, with the filter cover in service position and the

[0032] air filter is removed;

[0033] Figure 4: another detailed view of the paint sprayer shown in Figure 1 in exploded view, showing only the left side shell of the housing, the control board and the operating unit;

[0034] Figure 5: a cross-section through Figure 2 - according to the section plane V and viewed in the direction of arrow .P5;

[0035] Figure 6: a detailed view of Figure 5 in area VI .

[0036] Figure 1 shows a perspective view of a handheld paint sprayer 1 according to the invention. Figures 2 to 6 show further views and details of this paint sprayer 1. The paint sprayer 1 comprises a housing 2 with a handle 3, a spray head 4, a paint container 5, a rechargeable battery 6, a blower motor 7 (see Figure 5), and a filter cover 8 with air supply openings 9. The filter cover 8, together with the housing 2, forms a filter box 10 in which an air filter 11 (see Figures 2 and 3) is accommodated. The paint sprayer 1 comprises a pressure chamber 13 (see Figure 5) as a receiving space 12 for the blower motor 7. The pressure chamber 13 comprises an air inlet 13a and an air outlet 13b towards the spray head 4. During operation, the blower motor 7 sucks in air in the area of ​​the air inlet 13a.

[0037] The filter box 10 is located with its air filter 11 opposite the air inlet 13a of the pressure chamber 13' (see Figure 5). Through the housing 2, between the pressure chamber 13, which:

[0038] Blower motor 7, and the filter box 10, a pre-chamber 14 is formed (see Figure 5). The pre-chamber 14 has air inlet openings 16 towards an outer surface 15 of the housing 2 (see Figures 2 and 3), which are covered by the air filter 11.

[0039] The paint sprayer 1 includes a pressure sensor 17 for detecting air pressure. This pressure sensor 17 is arranged on a control board 18 (see Figure 4).

[0040] In the housing 2, an opening 19 is formed which leads into the prechamber 14 (see Figures 2 and 41).

[0041] In the installed state, the control board 18 - as shown schematically in Figure 4 by a section of the control board sketched with thin lines, which is designated 18? - is arranged on the housing 2 such that the pressure sensor 17 is held by it in the region of the opening 19 and detects an air pressure prevailing in the pre-chamber 14. The pre-chamber 14 forms an airtight pre-chamber 20 of the pressure chamber 13, wherein this pre-chamber 20 is in air exchange exclusively with the pressure chamber 13 and the filter box 10 and the opening 19 is sealed by the control board 18.

[0042] As can be seen from Figure 5, the filter box 10 is arranged above the prechamber 14 in the region of its air inlet openings 16 located above the air inlet 13a of the pressure chamber 13. The air inlet openings 16 of the prechamber 14 are covered by the air filter 11 accommodated in the filter box 10, so that only filtered ambient air can flow into the prechamber 14.

[0043] The filter box 10 has an internal volume V10, which corresponds to a volume V11 of the air filter 11, so that the filter box 10 is completely filled by the air filter 11 and the latter cannot slip in the filter box 10. To ensure this, the air filter 11 is pressed onto the air inlet openings 16 of the prechamber 14 when the filter cover 8 is closed.

[0044] The filter box 10 itself is formed by the housing 2 and by the filter cover 8 forming an upper side 21 of the paint sprayer 1.

[0045] The air supply openings 9 of the filter cover 8 are all located opposite the air inlet 13a of the pressure chamber 13.

[0046] The opening 19 in the pre-chamber 14 is arranged in a recess 22 of the housing 2, which is located on a rear side 23 of the

[0047] Housing 2 is formed opposite to the spray head 4.

[0048] The control board 18 is received in the recess 22 and fixed therein. As described above and shown schematically in Figure 4, the control board 18 rests against the housing 2, and the opening 19 of the prechamber 14, into which the pressure sensor 17 projects, is sealed from the environment U by the control board 18.

[0049] Above the recess 22 of the housing 2, which comprises a left side shell 2a and a right side shell 2b, a first fin 24a is formed on the housing, through which the air filter 11 is positioned over the air inlet openings 16 of the pre-chamber 14. Opposite this first fin 24a is a second fin 24b, T-shaped in plan view, through which the air filter 11 is also positioned. Furthermore, the T-shaped fin 24b also forms a contact surface 25, which also forms a side wall 26 of the filter box 10.

[0050] The paint sprayer 1 also includes a control unit 27 (user interface). This control unit 27 is housed in the recess 22, which also houses the control board 18. The recess 22 is closed by the control unit 27 (see Figure 1).

[0051] The operating unit 27, together with the control board 18, forms a structural unit 28. The structural unit 28 comprises a rotary switch 30 as an adjustment device 29, by means of which one of several power levels of the blower motor 7 can be selected for operating the paint sprayer 1. A zero-power level is also provided, in which the blower motor 7 is switched off. This is implemented by means of a zero position of the rotary switch 30 or, alternatively, can be implemented by an additional on / off switch on the paint sprayer, which forms a main switch. The pressure sensor 17 of the control board 18 and the adjustment device 29 are arranged on opposite outer surfaces 28a, 28b of the structural unit 28. Alternatively, instead of a rotary switch, according to a variant not shown, buttons can also be provided for selecting the power levels.

[0052] The control unit 27 also includes a filter change indicator 31. This includes an LED 32, which lights up green as long as the air filter 11 allows sufficient air supply to the blower motor 7 during operation of the paint sprayer 1 and which lights up red when the blower motor 7 is no longer supplied with sufficient air through the air filter 11 during operation of the paint sprayer 1.

[0053] The filter cover 8 is pivotally connected to the operating part 27 and, in its closed state, which is shown in Figure 1, is additionally connected to the housing in a locking manner (see Figures 1, 3 and 4). The operating part 27 has two laterally arranged, opposite receptacles 33a, 33b (see Figure 4), in each of which an arm 34a, 34b of the filter cover 8 is guided so as to be pivotable about a pivot axis SWA (see Figure 3) lying transversely to a spray axis SPA (see Figure 1).

[0054] The blower motor 7 is powered by the rechargeable battery 6 and the control unit 27 also includes a

[0055] Battery status indicator 35 for this rechargeable battery 6 (see Figure 1).

[0056] The left side shell 2a and the right side shell 2b lie against one another with congruent contact surface sections 36a, 36b to form the housing 2 and are additionally connected to one another in a form-fitting manner (see in particular Figures 4 and 5). The pre-chamber 14 is formed by a left pocket 37a formed in the left side shell 2a (see Figure 5 - diagonal hatching) and by a right pocket 37b formed in the right side shell 2b (see crossed hatching). In the section shown in Figure 5, which runs according to the section line V shown in Figure 2 and is viewed in the spray direction x (see Figure 1), the two pockets 37a and 37b are indicated by the above-mentioned hatching of the cut surfaces. To maintain clarity, the other cut surfaces in Figure 5 are not hatched.

[0057] The pressure chamber 13, which is formed by an upper pot T13-1 and a lower pot T13-2 and accommodates the blower motor 7, is fixed between the adjacent side shells 2a, 2b in the housing 2. According to a variant not shown, the pressure chamber can also be formed, similarly to the prechamber, by the adjacent side shells themselves. These are then each formed with an additional pocket; these two additional pockets then form the pressure chamber when the half shells are assembled and accommodate the blower motor.

[0058] As can also be seen from the partial illustration of Figure 6, which shows an enlarged view of an area designated VI in Figure 5, the right side shell 2b with the right pocket 37b rests with a right, curved edge section 38b on a nozzle 39 of the pressure chamber 13, and the left side shell 2a with the left pocket 37a rests with a left, curved edge section 38a on the nozzle 39 of the pressure chamber 13, wherein a sealing lip 40b is formed on each of the edge sections 38a, 38b. The assembled side shells 2a, 2b surround the nozzle 39 in a ring-like manner, so that a circumferential seal is provided. According to embodiments not shown, it can also be provided to form a sealing lip on the nozzle of the pressure chamber or both on the nozzle and on the curved

[0059] To form sealing lips on the edge sections, which are then arranged offset from one another in such a way that a double seal is achieved.

[0060] The filter box 10 with the air filter 11 and the pre-chamber 14 form an intake unit 41. This is designed to be so tightly sealed, with the exception of the air supply openings 9 of the filter cover 8, and is connected so tightly to the pressure chamber 13 that the blower motor 7, even at its maximum power, can only draw in air from the filter box 10 through the air filter 11. This prevents the intake of unwanted air and prevents the housing from becoming internally contaminated by the flow of unwanted air and components installed in the housing from becoming contaminated.

[0061] To operate the handheld paint sprayer 1, which comprises the blower motor 7, the pressure chamber 13, the pre-chamber 14, the filter box 10 with the air filter 10 arranged therein and the control board 18, the following steps are provided: the pre-chamber 14 is arranged between the filter box 10 and the pressure chamber 14 and, when the paint sprayer 1 is in operation, is flowed through by air which is sucked in by the blower motor 7 through the air filter from an environment U; the air pressure prevailing in an interior space 43 of the pre-chamber 14 is repeatedly recorded; by means of the setting device 29 on the control board 17, a user can set one of...several power levels of the blower motor 7 are selected; a control device 44 of the control board 17 repeatedly calculates a pressure difference from a first air pressure value detected when the blower motor 7 is stopped and a second air pressure value detected when the blower motor 7 is running; when a pressure difference limit value predefined for each adjustable power level is reached, the user is signaled that the air filter 11 needs to be changed.

[0062] It is provided that the first air pressure value, by which the air pressure is detected when the blower motor 7 is stationary, is detected in a time window which lies between an actuation of a main switch of the paint spray device 1 and the starting of the blower motor 7. In this case, it is provided that the starting of the blower motor 7 is regulated in such a way that the starting of the blower motor 7 is only released by the control device 44 of the control board 18 when the first air pressure value has been detected. In this case, the detection of the first air pressure value takes place by at least one measurement and in particular several successive measurements.

[0063] Here, the air pressure prevailing in the interior 43 of the prechamber 14 is detected by the control board 18 by means of the pressure sensor 17 arranged thereon, wherein the pressure sensor 17 is held by the control board 18 in the opening 19 in the wall 42 of the prechamber 14, and the opening 19 is sealed by the control board 18.

[0064] In principle, the pressure difference between the first air pressure value measured with the blower motor 7 stopped and each second air pressure value measured with the blower motor 7 running increases as the air filter 11 becomes increasingly clogged. The corresponding maximum pressure difference limits are stored in the control device 44 for each power level of the paint sprayer 1.

[0065] List of reference symbols:

[0066] 1 paint sprayer

[0067] 2 housing of 1 2a left side shell of 2

[0068] 2b right side shell of 2

[0069] 3 handles of 1

[0070] 4 spray heads of 1

[0071] 5 paint containers of 1 6 rechargeable batteries of 1

[0072] 7 Blower motor

[0073] 8 filter covers

[0074] 9 air supply opening of 8

[0075] 10 Filter boxes 11 Air filters

[0076] 12 Recording room

[0077] 13 Pressure chamber

[0078] 13a Air inlet of 13

[0079] 13b Air outlet from 13 14 prechamber

[0080] 15 exterior area of ​​2

[0081] 16 air intake opening of 14

[0082] 17 Pressure sensor

[0083] 18 Control board 19 Opening in 14

[0084] 20 Anteroom

[0085] 21 Top of 1

[0086] 22 recess in 2 '

[0087] 23 back of 2 24a first fin on 2

[0088] 24b second, T-shaped fin on 2

[0089] 25 contact surface formed by 24b

[0090] 26 Side wall formed by 24b 27 Control unit 28 Assembly formed by 18 and 27 28a First outer surface of 28 28b Second outer surface of 28 29 Adjustment device 30 Rotary switch as 29 31 Filter change indicator of 27 32 LED 33a, 33b Holder on 27 for 34a, 34b 34a, 34b Arm of 8

[0091] 35 Battery status indicator 36a, 63b Contact surface section of 2a, 2b 37a, 37b Pocket in 2a, 2b 38a Left, curved edge section of 37a 38b Right curved edge section of 37b 39 Nozzle of 14 40b Sealing lip on 38b 41 Suction unit 42 Wall of the pre-chamber 43 Interior of the pre-chamber

[0092] 44 Control device

[0093] SPA spray axis of 1 SWA swivel axis of 8 to 2 T13-1 upper pot of 33 T13-2 lower pot of 13 U environment V10 internal volume of 10 V11 volume of 11 x spray direction

Claims

Claims:

1. Hand-held paint sprayer (1) comprising - a housing (2) with a handle (3), - a spray head (4), -- a blower motor (7), - an air filter (11), characterized in that - that the paint spray device (1) comprises a pressure sensor (17) for detecting an air pressure, wherein the pressure sensor is arranged between the air filter and the blower motor.

2. Hand-held paint sprayer (1) according to claim 1, characterized in that — the paint sprayer (1) has a filter cover (8) with air supply openings (9) and a filter box (10) with the air filter (11), - that the paint spraying device (1) comprises a pressure chamber (13) as a receiving space (12) for the blower motor (7), - wherein the pressure chamber (13) has an air inlet (13a) and a Air outlet (13b).

3. Hand-held paint sprayer (1) according to claim 2, characterized in that - the filter box (10) with its air filter (11) is Air inlet (13 a) is located opposite the pressure chamber (13) and a pre-chamber (14) is formed by the housing (2) between the pressure chamber (13) and the filter box (10), - that the pre-chamber (14) has air inlet openings (16) towards an outer surface (15) of the housing (2), which are covered by the air filter (11).

4. Hand-held paint sprayer (1) according to claim 3, characterized in that - that an opening (19) is formed in the housing (2) which leads into the pre-chamber (14), - that the pressure sensor (17) detects a pressure prevailing in the pre-chamber (14), wherein the pre-chamber (14) forms an airtight pre-chamber (20) which is in air exchange exclusively with the pressure chamber (13) and the filter box (10).

5. Hand-held paint sprayer according to at least one of the preceding claims, characterized in that - that the filter box (10) is arranged above the pre-chamber (14) in the region of its air inlet openings (16) located above the air inlet (13a), - that the filter box (10) comprises an internal volume (V10) which corresponds to a volume (Vll) of the air filter (11), - that the filter box (10) is formed by the housing (2) and by the filter cover (8) forming an upper side (21) of the paint sprayer (1) and - that the air supply openings (9) of the filter cover (8) are at least partially opposite the air inlet (13a).

6. Hand-held paint sprayer according to at least one of the preceding claims, characterized in that the opening (19) is arranged in a recess (22) which is formed on a rear side (23) of the housing (2) opposite the spray head (4), that the paint sprayer (1) comprises a control board (18) and that the control board (18) is received and fixed in the recess (22), that the pressure sensor (17) is arranged on the control board (18) and that the pressure sensor (17) is arranged in the region of the opening (19), that the control board (18) rests against the housing (2) in such a way that: the opening (19) is sealed by the control board (18).

7. Hand-held paint spray device according to at least one of the preceding claims, characterized in that the filter cover (8) is pivotally connected to an operating part (27) and that the filter cover (8) is additionally connected to the housing (2) in a latching manner in a closed state.

8. Hand-held paint spray device according to at least one of the preceding claims, characterized in that the paint spray device (1) comprises a / the operating part (27), wherein the recess (22) in which the control board (18) is received is closed by the operating part (27).

9. Hand-held paint sprayer according to claim 8, characterized in that the operating part (27) together with the control board (18) forms a structural unit (28), wherein the structural unit (28) comprises an adjusting device (29) for selecting one of several power levels of the blower motor (7) and wherein the pressure sensor (17) and the adjusting device (29) are arranged on opposite outer surfaces (28a, 28b) of the structural unit (28).

10. Hand-held paint sprayer according to claim , characterized in that the operating part (27) further comprises a filter change indicator (31) and / or that the paint sprayer (1) for supplying the blower motor (7) has a rechargeable battery (6) and that the control unit (27) comprises a battery status indicator (35) for this rechargeable battery (6).

11. Hand-held paint spray device according to at least one of the preceding claims, characterized in that the housing (2) comprises a left side shell (2a) and a right side shell (2b) which abut one another with congruent contact surface sections (36a, 36b) to form the housing (2).

12. Hand-held paint spray device according to claim 11, characterized in that the pressure chamber (13) is fixed between the adjacent side shells (2a, 2b) in the housing (2) or is formed by the adjacent side shells (2a, 2b).

13. Hand-held paint spray device according to claim 11 or according to claims 11 and 12, characterized in that the pre-chamber (14) is formed by a left pocket (37a) formed in the left side shell (2a) and by a right pocket (37b) formed in the right side shell (2b).

14. Hand-held paint spray device according to claim 13, characterized in that the left side shell (2a) with the left pocket (37a) rests with a left arcuate edge section (38a) on a nozzle (39) of the pressure chamber (13) and that the right side shell (2b) with the right pocket (37b) rests with a right arcuate edge section (38b) on the nozzle (39) of the pressure chamber (13) and that a sealing lip (40b) is formed on the nozzle (39) and / or on both edge sections (38a, 38b).

15. Procedure for operating a handheld paint sprayer ( 1 ), in particular a paint spraying device according to at least one of claims 1 to 14, which comprises a control board (18), wherein a pressure sensor (17) repeatedly detects a pressure prevailing between an air filter and a blower motor Air pressure is detected, wherein a control device (44) of the control board (18) repeatedly calculates a value from a first air pressure value detected when the blower motor (7) is stopped and a second air pressure value detected when the blower motor (7) is running. Pressure difference is calculated, whereby when a predefined pressure difference limit is reached, the user is signaled that it is necessary to change the air filter (11).

16. Method for operating a handheld paint sprayer (1) according to claim 15, comprising the further steps that one of several power levels of the blower motor (7) is selected by a user by means of an adjusting device (29) of the control board (18), that when a pressure difference limit value predefined for the respectively set power level is reached, the user is signaled that a change of the air filter (11) is necessary.

17. Procedure for operating a handheld paint sprayer ( 1 ) according to claim 15 or 16, characterized in that the first air pressure values ​​and the second air pressure values ​​are measured by the pressure sensor ( 17 ) in an interior space ( 43 ) of a pre-chamber ( 14 ) which is arranged between a filter box ( 10 ) with the air filter ( 11 ) arranged therein and a pressure chamber ( 13 ) with the blower motor ( 7 ) arranged therein.

18. Method according to claim 17, characterized in that the pressure sensor (17) is arranged on the control board (18) and is held by the control board (18) in an opening (19) in a wall (42) of the prechamber (14) such that the opening (19) is sealed by the control board (18).

19. Method according to at least one of claims 15 to 18, characterized in that the first air pressure value, by means of which the air pressure is detected when the blower motor is at a standstill, is detected in a time window which lies between the actuation of a main switch of the paint spray device and the starting of the blower motor, wherein it is provided in particular that the starting of the blower motor is only released by the control device of the control board when the first air pressure value has been detected, wherein it is provided in particular that the first air pressure value is detected by at least one measurement and preferably several successive measurements.

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