Air-cooled high-pressure cleaning device

Abstract

The invention relates to an air-cooled high-pressure cleaning device (10) comprising an outer housing (12) and a motor pump unit (14) which is received therein and which has a pump (16) and an electric motor (17) that drives the pump (16). The cleaning device also comprises a cooling air channel system (49), which is arranged or formed in the outer housing (12), for cooling the motor pump unit (14), said cooling air channel system being fluidically connected to the atmosphere via housing openings. In order to develop a high-pressure cleaning device (10) of the aforementioned type such that the device has lower noise emissions, the invention proposes that the high-pressure cleaning device (10) has a cover (70) arranged at a distance to at least one housing opening, wherein an intermediate space (55) is arranged between the cover (70) and the at least one housing opening, and the at least one housing opening is fluidically connected to the atmosphere via the intermediate space (55).

Description

[0001] AIR-COOLED HIGH-PRESSURE CLEANER

[0002] The invention relates to an air-cooled high-pressure cleaning device with an outer housing and a motor pump unit accommodated therein, which has a pump and an electric motor driving the pump, and with a cooling air duct system arranged or formed in the outer housing for cooling air for cooling the motor pump unit, which is fluidly connected to the atmosphere via housing openings.

[0003] When high-pressure cleaning equipment is in operation, the motor pump unit heats up. It is therefore necessary to provide sufficient cooling for the motor pump unit to reduce the risk of damage from overheating and to ensure safe operation of the high-pressure cleaning equipment. The cooling can be air or water cooling. Water cooling requires a complex design and greater material usage than air cooling. To provide effective air cooling, it is necessary to convey the highest possible volume flow of cooling air over the motor pump unit. For this purpose, it is known to create a cooling air duct system in the outer casing through which cooling air can flow, cooling the motor pump unit. The flowing cooling air can lead to a significant emission of operating noise when the high-pressure cleaning equipment is in operation.It is desirable to keep noise emissions as low as possible in order to make working comfortable for a user and to meet possible sound insulation requirements.

[0004] A high-pressure cleaning device of this type is known from document WO 2017 / 060003 A1. The object of the present invention is to further develop a high-pressure cleaning device of the type mentioned above in such a way that it has lower noise emissions.

[0005] This object is achieved according to the invention in a high-pressure cleaning device of the generic type in that the high-pressure cleaning device has a cover arranged at a distance from at least one housing opening, wherein an intermediate space is arranged between the cover and the at least one housing opening and the at least one housing opening is fluidly connected to the atmosphere via the intermediate space.

[0006] The cooling air duct system, through which the cooling air flows to cool the motor pump unit of the high-pressure cleaning device, is fluidly connected to the atmosphere via housing openings. At least one housing opening is assigned a cover which is arranged at a distance from the at least one associated housing opening, forming an intermediate space between the cover and the at least one associated housing opening. The at least one housing opening is fluidly connected to the atmosphere via the intermediate space. The cover, which is arranged at a distance from the at least one housing opening, has the effect that the noise escaping from the at least one housing opening can hit the cover and is thus effectively dampened. At the same time, the flowing cooling air is deflected.In practice, it has been shown that the noise emissions caused by the flow of cooling air can be reduced by redirecting the cooling air. With this embodiment of the invention, the noise emissions caused by the operation of the high-pressure cleaning device can thus be kept to a minimum.

[0007] It is advantageous if the cover forms a cover opening that opens into the intermediate space. This allows a cooling air flow with a high volume flow to be provided via the cover opening in order to achieve effective cooling of the motor pump unit. The cover opening is preferably arranged laterally offset from the at least one housing opening, which is fluidly connected to the atmosphere via the intermediate space. Due to the offset arrangement of the cover opening relative to the housing opening, a deflection of the cooling air flow can be achieved in a simple manner. As already explained, the noise emission caused by the flow of the cooling air can be reduced by deflecting the cooling air.

[0008] The cover can be designed in one piece.

[0009] For ease of production, it is advantageous if the cover is designed in several parts. This allows for a simple design of tools for manufacturing the components that make up the cover.

[0010] For simple structural implementation, the cover is conveniently designed as part of the outer casing.

[0011] For particularly effective noise reduction, it is advantageous if at least one housing opening, which is fluidly connected to the atmosphere via the intermediate space, forms a housing inlet opening, and the cooling air duct system has a first cooling air duct through which cooling air can be supplied to the motor pump unit and which is fluidly connected to the atmosphere via the housing inlet opening. It has been shown that high noise emissions are caused on the inlet side. Covering at least one housing inlet opening enables an effective reduction in noise emissions.

[0012] In an advantageous embodiment of the invention, the first cooling air duct has a duct section and a cooling air plenum, wherein the duct section is fluidly connected to the cooling air plenum via a passage, and wherein the at least one housing inlet opening adjoins the cooling air plenum upstream, wherein the cross-section of the cooling air plenum is larger than the cross-section of the duct section with respect to the direction of the cooling air flowing through it. With such an embodiment of the invention, a lower flow velocity of the cooling air is enabled in the cooling air plenum compared to the flow velocity of the cooling air in the duct section. Faster-flowing cooling air can generate more noise than slower-flowing cooling air.Because the cross-section of the cooling air collection chamber is larger than the cross-section of the duct section arranged downstream of the cooling air collection chamber, the cooling air is accelerated into the duct section and thus into the interior of the outer casing for effective cooling, so that the resulting noise emission can be further reduced.

[0013] It is advantageous if the high-pressure cleaning device has several housing inlet openings arranged at a distance from one another and leading directly into the cooling air collection chamber. This allows for a simple design for the cooling air collection chamber with a large cross-section.

[0014] It may be provided that the high-pressure cleaning device has a single housing inlet opening.

[0015] For a structurally simple implementation, the at least one housing inlet opening is preferably arranged on an underside of the outer housing.

[0016] Advantageously, the cooling air duct system is lined on the inside, at least in sections, with a sound-absorbing material. The sound-absorbing material, for example a foam material, can dampen, in particular, noise from the motor pump unit and noise caused by the flow of cooling air in the cooling air duct system. This can further reduce the noise emissions of the high-pressure cleaning device. It is advantageous if the cooling air duct system is angled and the cooling air flowing through the cooling air duct system is deflected at least once. It has been shown that bending the cooling air duct system and deflecting the cooling air promotes a reduction in noise emissions.

[0017] Preferably, the cooling air duct system runs at least partially between an outer wall of the outer housing and at least one further duct wall enclosed or formed by the outer housing, which is arranged at a distance from the outer wall of the outer housing. This allows the at least one cooling air duct to be integrated into the outer housing in a simple structural manner.

[0018] It is advantageous if the motor pump unit is supported on the outer casing by means of damping elements. These damping elements reduce the transmission of vibrations from the motor pump unit to the outer casing. Noise emissions due to structure-borne noise can thus be reduced.

[0019] For a compact design, the motor pump unit is advantageously arranged between parallel duct sections of the cooling air duct system. This arrangement allows for relatively long flow paths. With a compact design, a relatively long air flow within the outer casing is thus possible. This allows for a further reduction in noise emissions.

[0020] It is advantageous if the motor pump unit has a pump inlet line and a pump outlet line that pass through a duct section of the cooling air duct system. The pump inlet line and the pump outlet line pass through openings, each of which has a sealing element arranged around it, which annularly encloses the pump inlet line and the pump outlet line, respectively. The sealing element minimizes the risk of an uncontrolled flow of cooling air. The sealing elements can also have a dampening effect, which can further reduce noise emissions.

[0021] The motor pump unit preferably has a fan impeller driven by the electric motor that conveys cooling air to the motor pump unit. The fan impeller draws in cooling air through the at least one housing inlet opening, the intermediate space, and the first cooling air duct and conveys it to the motor pump unit.

[0022] Advantageously, the motor-pump unit is enclosed by an inner housing, which has openings through which the cooling air duct system and the inner housing are fluidly connected. The inner housing can further reduce noise emissions. Furthermore, the inner housing allows the cooling air flow to be directed over the motor-pump unit in a targeted manner, thus creating particularly effective cooling.

[0023] For particularly targeted cooling air guidance, it is advantageous if the inner housing has an air guide sleeve which projects into a cooling air duct of the cooling air duct system and has an inner housing opening at its end projecting into the cooling air duct.

[0024] It is advantageous if at least one sealing element is arranged at the edge of an inner housing opening to create a tight flow connection between the cooling air duct system and the inner housing. The sealing element creates the tightest possible flow connection between the cooling air duct system and the inner housing, so that any cooling air flow noise at the transition from the cooling air duct system to the inner housing can be kept to a minimum. To generate a particularly effective cooling air flow, it is advantageous if the fan impeller is arranged at an inner housing opening in the inner housing.

[0025] The cooling air supplied to the motor pump unit can be discharged to the atmosphere via at least one housing opening which is fluidly connected to the atmosphere and is designed as a housing outlet opening.

[0026] It is advantageous if a cable holder is arranged on the outer housing, which has at least one air outlet opening, wherein, with respect to the flow direction of the cooling air, at least one housing outlet opening is arranged upstream of the at least one air outlet opening and at a distance from it. With such an embodiment of the invention, cooling air can reach the atmosphere via the at least one housing outlet opening and the downstream air outlet opening of the cable holder. This enables, on the one hand, a reduction in noise emissions on the outlet side and, on the other hand, a space-saving integration of the cable holder, on which, for example, a cable for the power supply of the high-pressure cleaning device can be wound.

[0027] It is particularly advantageous if the high-pressure cleaning device has at least one first housing outlet opening and at least one second housing outlet opening, wherein cooling air can be released directly into the atmosphere via the at least one first housing outlet opening and the at least one second housing outlet opening is arranged upstream of the at least one air outlet opening of the cable holder.

[0028] For easy handling of the high-pressure cleaning device, it is advantageous if at least one accessory holder and / or storage space is arranged on the outer housing. Accessories, in particular a spray gun and / or a spray lance, can be arranged on the accessory holder. Additional accessories, such as a pressure hose or cleaning cloths, can be stored in the storage space. For easy assembly, the outer housing has two outer housing halves, with the motor pump unit positioned between the outer housing halves.

[0029] For the stability of the outer casing, it is advantageous if the outer casing has a honeycomb-like reinforcement structure on the inside. This honeycomb reinforcement structure enables good stability while maintaining a lightweight construction.

[0030] The following description of a preferred embodiment of the invention serves to explain it in more detail in conjunction with the drawings. They show:

[0031] Figure 1: a perspective view of a high-pressure cleaning device having an outer housing with two outer housing half-shells;

[0032] Figure 2: a partially cut-away side view of the high-pressure cleaning device;

[0033] Figure 3: a bottom view of the high-pressure cleaning device;

[0034] Figure 4: a perspective view of the high-pressure cleaning device in the direction of arrow A in Figure 2, wherein an outer housing half shell of the outer housing facing the viewer is hidden;

[0035] Figure 5: a representation corresponding to Figure 4, with an additional

[0036] Inner housing half-shell of an inner housing surrounding a motor pump unit is hidden; Figure 6: a representation corresponding to Figure 5, wherein the motor pump unit and another inner housing half-shell of the inner housing are additionally hidden.

[0037] The drawing schematically shows a preferred embodiment of an air-cooled high-pressure cleaning device according to the invention, which is designated overall by the reference numeral 10.

[0038] The high-pressure cleaning device 10 comprises an outer housing 12 and a motor pump unit 14 accommodated in the outer housing 12 with a pump 16 and an electric motor 17 driving the pump 16 via a belt drive 18. The electric motor 17 also drives a fan wheel 19.

[0039] The pump 16 has a pump inlet line 20 with a pump inlet 21, through which cleaning fluid to be pressurized can be supplied to the pump 16. The pump 16 pressurizes the cleaning fluid. The pressurized cleaning fluid can be discharged from the pump 16 via a pump outlet line 22. The pump outlet line 22 has a pump outlet 23, to which a known fluid discharge line, for example a pressure hose, can be connected. This line is therefore not shown in the drawing for clarity.

[0040] In an advantageous embodiment, the outer housing 12 has a first outer housing half-shell 24 and a second outer housing half-shell 26. The second outer housing half-shell 26 is hidden in Figures 4 to 6 to allow a view into the interior of the outer housing 12.

[0041] On the inside, the two outer housing half-shells 24, 26 each have a honeycomb-like reinforcement structure 27.

[0042] The outer housing 12 has a front side 28 and a rear side 30. The front side 28 and the rear side 30 are connected to one another by means of a first narrow housing side 32 and a second narrow housing side 34 opposite the first narrow housing side 32. In the upright use position of the high-pressure cleaning device 10 shown in Figures 1 to 6, the narrow housing sides 32, 34 are aligned vertically. The outer housing 12 also has a top side 36 and a bottom side 38.

[0043] A first base 40 and a second base 42 are arranged on the underside 38 of the outer housing 12. The bases 40, 42 are U-shaped and each have a first leg 40a, 42a and a second leg 40b, 42b, which are connected to each other via a web 40c, 42c. In the upright position, the high-pressure cleaning device 10 rests on a base 44 with the webs 40c, 42c of the bases 40, 42.

[0044] A carrying handle 46 for carrying the high-pressure cleaning device 10 is arranged on the upper side 36 of the outer housing 12.

[0045] A rotary switch 48 for switching the high-pressure cleaning device 10 on and off is arranged on the front side 28 of the outer housing 12.

[0046] A storage compartment 51 for storing accessories, such as the pressure hose, is located on the rear side 30 of the outer housing 12. Accessory holders 51a, 51b are arranged on the outside of the storage compartment 51. Accessories, such as a spray lance and / or a spray gun, can be removably secured to the accessory holders 51a, 51b.

[0047] The pump inlet 21 and the pump outlet 23 are arranged on the first narrow side 32 of the housing.

[0048] A cable holder 50 is arranged on the second narrow housing side 34, onto which a user can wind, for example, a cable (not shown in the drawing) for supplying power to the high-pressure cleaning device 10. The following describes walls encompassed or formed by the outer housing 12, for example an outer wall or channel walls that form a cooling air channel system 49 for cooling air for cooling the motor pump unit 14. The respective walls are formed jointly by the outer housing half-shells 24, 26. The structure of the outer housing 12 with the corresponding walls is explained below using the example of the first outer housing half-shell 24. The explanations also apply to the second outer housing half-shell 26, which forms these walls together with the first outer housing half-shell 24.

[0049] The outer housing 12 is double-walled on its underside 38 and, for this purpose, has an outer wall 52 and an inner wall 54, which are arranged at a distance from one another and between which an intermediate space 55 is formed. This is particularly clear from Figure 2. The inner wall 54 has a plurality of housing inlet openings 56, which are fluidly connected to the intermediate space 55. Cooling air can flow through the intermediate space 55 and the housing inlet openings 56 into a first cooling air duct 58 of the cooling air duct system 49. The flow direction of the cooling air is indicated by arrows 59.

[0050] The outer wall 52 forms a cover 60, which is assigned to the housing inlet openings 56 and arranged at a distance from the housing inlet openings 56. This cover covers the housing inlet openings 56 in the direction of the atmosphere and delimits the intermediate space 55 at the bottom. The cover 60 is designed in several parts and comprises a first cover piece 62, 63 and a second cover piece 64, 65 for each outer housing half-shell 24, 26. The first cover piece 62 assigned to the first outer housing half-shell 24 is formed by a wall of the outer housing 12 in the region of the front side 28 of the outer housing 12, and the first cover piece 63 assigned to the second outer housing half-shell 26 is formed by a wall of the outer housing 12 in the region of the rear side 30 of the outer housing 12.The second cover pieces 64, 65 are each arranged between the first legs 40a, 42a and the second legs 40b, 42b of the feet 40, 42 and are overlapped by the first cover pieces 62, 63.

[0051] The second cover pieces 64, 65 are spaced apart from one another, forming a cover opening 66 between the second cover pieces 64, 65. The cover opening 66 communicates with the housing inlet openings 56 via the intermediate space 55. Furthermore, the cover opening 66 is laterally offset from the housing inlet openings 56, so that the flowing cooling air is deflected in the intermediate space 55.

[0052] The first cooling air duct 58 of the cooling air duct system 49 comprises a cooling air collection chamber 70 and a duct section 72. The first cooling air duct 58 is designed such that, with respect to the flow direction 59 of the cooling air, the cooling air collection chamber 70 adjoins the housing inlet openings 56. The cooling air collection chamber 70 is connected to the duct section 72 by means of a passage 74. With respect to the upright use position of the high-pressure cleaning device 10, the cooling air collection chamber 70 is bounded at the bottom by the inner wall 54 and at the top by a horizontally arranged first ceiling wall section 76 and a horizontally arranged second ceiling wall section 77. The passage 74 is arranged between the two ceiling wall sections 76 and 77.The top wall sections 76, 77 each transition outwardly into side wall sections 78, 79, which connect the first top wall section 76 and the second top wall section 77 to the inner wall 54 of the outer housing 12. The side wall sections 78, 79 each form the lateral boundary of the cooling air collection chamber 70. Relative to the direction of the cooling air flowing through the first cooling air duct 58, the cooling air collection chamber 70 has a larger cross-section than the duct section 72.

[0053] In the flow direction 59 of the cooling air, a first duct section 80 of the duct piece 72 adjoins the passage 74. The first duct section 80 runs horizontally and parallel to the cooling air collection chamber 70 relative to the upright operating position of the high-pressure cleaning device 10. The first duct section 80 is bounded at the bottom by the second ceiling wall section 77 of the cooling air collection chamber 70 and at the top by a first duct wall 82 arranged at a distance from the second ceiling wall section 77 and running parallel to it. A duct web 84 connects the first duct wall 82 to the first ceiling wall section 76 of the cooling air collection chamber 70. The duct web 84 forms the upstream, frontal boundary of the first duct section 80.

[0054] Adjoining the first duct section 80 in the cooling air flow direction 59 is a second duct section 86, which runs vertically relative to the upright use position of the high-pressure cleaning device 10. The second duct section 86 is delimited on the one hand by a wall of the outer housing 12 in the region of the first narrow side 32 of the housing and on the other hand by a second duct wall 88, which runs vertically and parallel to this wall in the upright use position of the high-pressure cleaning device 10. The first duct wall 82 merges into the second duct wall 88. The second duct wall 88 has a recess forming a duct opening 90. A third duct wall 92 connects the second duct wall 88 to the wall of the outer housing 12 in the region of the first narrow side 32 of the housing and forms the downstream, end-face boundary of the first cooling air duct 58.

[0055] The pump inlet line 20 and the pump outlet line 22 pass through the second channel section 86 of the channel piece 72 of the first cooling air channel 58. The second channel wall 88 and the wall of the outer housing 12 in the region of the first narrow housing side 32 therefore have through-openings 94, 95, 96, 97. Sealing elements 98, 99 are arranged at the through-openings 94, 96 of the second channel wall 88 in order to prevent cooling air from flowing through the through-openings 94, 96. The sealing elements 98, 99 are each arranged in a ring around the pump inlet line 20 and the pump outlet line 22. The first cooling air channel 58 is lined on the inside in sections with a sound-absorbing material 100. The sound-absorbing material 100 can be, for example, a foam material.The sound-absorbing material 100 is arranged in the first cooling air duct 58 along the second ceiling wall section 77 of the cooling air collection chamber 70, which delimits the first duct section 80 downwards, and extends on the inside along the wall of the outer housing 12 in the region of the first housing narrow side 32 up to the third duct wall 92.

[0056] The outer housing 12 has a plurality of first housing outlet openings 102 and a plurality of second housing outlet openings 103 on the second narrow housing side 34. Cooling air can be discharged directly to the atmosphere via the first housing outlet openings 102, whereas the cable holder 50, also arranged on the second narrow housing side 34, has a plurality of air outlet openings 104 downstream of the second housing outlet openings 103, so that the cooling air flowing through the second housing outlet openings 103 reaches the atmosphere via the air outlet openings 104 of the cable holder 50. This allows a reduction in noise emissions on the outlet side.

[0057] The second cooling air duct 106 has a first duct section 108 and a second duct section 110.

[0058] The first duct section 108 runs vertically relative to the upright use position of the high-pressure cleaning device 10. The first duct section 108 is delimited by a wall of the outer housing 12 in the region of the second narrow housing side 34 and by a first duct wall 112 aligned parallel to this wall and spaced apart from it. A second duct wall 114 connects the first duct wall 112 to the wall of the outer housing 12 in the region of the second narrow housing side 34. The second duct wall 114 forms the downstream, end-face boundary of the first duct section 108 of the second cooling air duct 106. The first duct section 108 of the second cooling air duct 106 is adjoined upstream by the second duct section 110, which runs horizontally relative to the upright use position of the high-pressure cleaning device 10.The second duct section 110 is bounded at the bottom by the first ceiling wall section 76 of the cooling air collection chamber 70 and at the top by a third duct wall 118. The first duct wall 112 and the third duct wall 118 merge into one another. The upstream, end-face boundary of the second duct section 110 of the second cooling air duct 106 is formed by the duct web 84, which also forms the end-face boundary of the first duct section 80 of the first cooling air duct 58. The duct web 84 thus separates the first cooling air duct 58 from the second cooling air duct 106. The duct web 84 and the third duct wall 118 of the second cooling air duct 106 are spaced apart from one another, forming a duct opening 120.

[0059] The second cooling air duct 106 is lined on the inside in sections with the sound-absorbing material 100, just like the first cooling air duct 58. The sound-absorbing material 100 is arranged in the second cooling air duct 106 along the first duct wall 112 delimiting the first duct section 108 and along the third duct wall 118 delimiting the second duct section 110. Furthermore, the sound-absorbing material 100 is arranged on the first ceiling wall section 76 of the cooling air plenum 70, which delimits the second duct section 110 at the bottom, and extends to the duct web 84.

[0060] Between the first cooling air duct 58 and the second cooling air duct 106, the cooling air duct system 49 has a receiving space 122.

[0061] The receiving space 122 is enclosed by an inner housing 124, in which the motor pump unit 14 is arranged. The inner housing 124 has two inner housing half-shells 125, 127.

[0062] The inner housing 124 further has a first inner housing opening 126 and a second inner housing opening 128. The first cooling air duct 58 opens into the inner housing 124 via the duct opening 90 and the first inner housing opening 126. The second cooling air duct 106 opens into the inner housing 124 via the duct opening 120 and the second inner housing opening 128. The second inner housing opening 128 is arranged at the free end of an air guide sleeve 129 of the inner housing 124 that projects into the second duct section 110 of the second cooling air duct 106. The first cooling air duct 58 and the second cooling air duct 106 are thus in flow communication with one another via the inner housing 124.

[0063] A sealing element 130 is arranged at the edge of the first inner housing opening 126 in order to establish a tight flow connection between the first cooling air duct 58 and the inner housing 124.

[0064] The fan wheel 19 is arranged at the first inner housing opening 126

[0065] Sealing elements 132, 133 are arranged at the second inner housing opening 128 in order to establish a tight flow connection between the inner housing 124 and the second cooling air duct 106.

[0066] The inner housing 124 is supported on the outer housing 12 by means of damping elements 134. The sealing elements 98, 99, 130, 132, 133 also serve as damping elements to achieve sound decoupling of the motor pump unit 14 from the outer housing 12.

[0067] During operation of the high-pressure cleaning device 10, cooling air, which is sucked in by the fan wheel 19, initially flows through the cover opening 66, the intermediate space 55 and the housing inlet openings 56 into the cooling air collection chamber 70 of the first cooling air duct 58. The offset arrangement of the cover opening 66 relative to the housing inlet openings 56 redirects the cooling air. From the cooling air collection chamber 70, the cooling air flows through the passage 74 into the first duct section 80 of the duct piece 72 and is redirected again. At the transition from the first duct section 80 to the second duct section 86, the cooling air is redirected once more. At the end of the second duct section 86, the cooling air enters the inner housing 124 through the duct opening 90 and the first inner housing opening 126. This redirects the cooling air further. In the inner housing 124, the cooling air is passed over the electric motor 17 and the pump 16 of the motor pump unit 14.The cooling air cools the motor pump unit 14 and dissipates the heat generated by the operation of the high-pressure cleaning device 10. The cooling air enters the second channel section 110 of the second cooling air channel 106 through the second inner housing opening 128 and the channel opening 120 of the second cooling air channel 106, where it is redirected again. The cooling air flows from the second channel section 110 into the first channel section 108, where it is redirected once more. At the end of the first channel section 110, the cooling air can exit the outer housing 12 through the first housing outlet openings 102 and the air outlet openings 104 of the cable holder 50, which are fluidly connected to the second housing outlet openings 103.

Claims

PATENT CLAIMS 1. An air-cooled high-pressure cleaning device having an outer housing (12) and a motor pump unit (14) accommodated therein, which motor pump unit has a pump (16) and an electric motor (17) driving the pump (16), and having a cooling air duct system (49) arranged or formed in the outer housing (12) for cooling air for cooling the motor pump unit (14), which is fluidically connected to the atmosphere via housing openings, characterized in that the high-pressure cleaning device (10) has a cover (60) arranged at a distance from at least one housing opening, wherein an intermediate space (55) is arranged between the cover (60) and the at least one housing opening, and the at least one housing opening is fluidically connected to the atmosphere via the intermediate space (55).

2. High-pressure cleaning device according to claim 1, characterized in that the cover (60) forms a cover opening (66) which opens into the intermediate space (55).

3. High-pressure cleaning device according to claim 2, characterized in that the cover opening (66) is arranged laterally offset from the at least one housing opening which is fluidly connected to the atmosphere via the intermediate space (55).

4. High-pressure cleaning device according to one of claims 1 to 3, characterized in that the cover (60) is designed in several parts.

5. High-pressure cleaning device according to one of the preceding claims, characterized in that the cover (60) is designed as part of the outer housing (12).

6. High-pressure cleaning device according to one of the preceding claims, characterized in that at least one over the space (55) a housing opening flow-connected to the atmosphere forms a housing inlet opening (56), and the cooling air duct system (49) has a first cooling air duct (58) through which cooling air can be supplied to the motor pump unit (14) and which is flow-connected to the atmosphere via the housing inlet opening (56).

7. High-pressure cleaning device according to claim 6, characterized in that the first cooling air duct (58) has a duct piece (72) and a cooling air collection chamber (70), wherein the duct piece (72) is fluidly connected to the cooling air collection chamber (70) via a passage (74), and wherein the at least one housing inlet opening (56) adjoins the cooling air collecting chamber (70) upstream, wherein the cross section of the cooling air collecting chamber (70) is larger than the cross section of the duct section (72) with respect to the direction of the cooling air flowing through it.

8. High-pressure cleaning device according to claim 7, characterized in that the high-pressure cleaning device (10) has a plurality of housing inlet openings (56) which are arranged at a distance from one another and open directly into the cooling air collecting chamber (70).

9. High-pressure cleaning device according to one of claims 6 to 8, characterized in that the at least one housing inlet opening (56) is arranged on an underside (38) of the outer housing (12).

10. High-pressure cleaning device according to one of the preceding claims, characterized in that the cooling air duct system (49) is lined on the inside at least in sections with a sound-absorbing material (100).

11. High-pressure cleaning device according to one of the preceding claims, characterized in that the cooling air duct system (49) is designed to be angled and the cooling air flowing through the cooling air duct system (49) undergoes at least one deflection.

12. High-pressure cleaning device according to one of the preceding claims, characterized in that the cooling air duct system (49) runs at least in sections between an outer wall of the outer housing (12) and at least one further duct wall (88, 112) encompassed or formed by the outer housing (12), which is arranged at a distance from the outer wall of the outer housing (12).

13. High-pressure cleaning device according to one of the preceding claims, characterized in that the motor pump unit (14) is supported on the outer housing (12) by means of damping elements (98, 99, 130, 132, 133, 134).

14. High-pressure cleaning device according to one of the preceding claims, characterized in that the motor pump unit (14) is arranged between mutually parallel channel sections (86, 108) of the cooling air channel system (49).

15. High-pressure cleaning device according to one of the preceding claims, characterized in that the motor pump unit (14) has a pump inlet line (20) and a pump outlet line (22) which pass through a channel section (72) of the cooling air channel system (49), wherein the pump inlet line (20) and the pump outlet line (22) pass through through openings (94, 96) on each of which a sealing element (98, 99) is arranged, which annularly encloses the pump inlet line (20) or the pump outlet line (22).

16. High-pressure cleaning device according to one of the preceding claims, High-pressure cleaning device according to one of the preceding claims, characterized in that the motor pump unit (14) has a fan wheel (19) driven by the electric motor (17) which conveys cooling air to the motor pump unit (14).

17. High-pressure cleaning device according to one of the preceding claims, characterized in that the motor pump unit (14) is surrounded by an inner housing (124), wherein the inner housing (124) has inner housing openings (126, 128) via which the cooling air duct system (49) and the inner housing (124) are fluidly connected to one another.

18. High-pressure cleaning device according to claim 17, characterized in that the inner housing (124) has an air guide sleeve (129) which projects into a cooling air duct (106) of the cooling air duct system (49) and has an inner housing opening (128) at its end projecting into the cooling air duct (106).

19. High-pressure cleaning device according to claim 17 or 18, characterized in that at least one sealing element (130, 132, 133) is arranged on the edge of an inner housing opening (126, 128) in order to establish a tight flow connection between the cooling air duct system (49) and the inner housing (124).

20. High-pressure cleaning device according to one of claims 17 to 19 in conjunction with claim 16, characterized in that the fan wheel (19) is arranged at an inner housing opening (126) of the inner housing (124).

21. High-pressure cleaning device according to one of the preceding claims, characterized in that the cooling air supplied to the motor pump unit (14) is released into the atmosphere via at least one housing opening which is fluidly connected to the atmosphere and which is designed as a housing outlet opening (102, 103).

22. High-pressure cleaning device according to claim 21, characterized in that a cable holder (50) is arranged on the outer housing (12), which has at least one air outlet opening (104), wherein, with respect to the flow direction (59) of the cooling air, at least one housing outlet opening (103) is arranged upstream of the at least one air outlet opening (104) and at a distance therefrom.

23. High-pressure cleaning device according to claim 22, characterized in that the high-pressure cleaning device has at least one first housing outlet opening (102) and at least one second housing outlet opening (103), wherein cooling air can be released directly into the atmosphere via the at least one first housing outlet opening (102) and the at least one second housing outlet opening (103) is arranged upstream of the at least one air outlet opening (104) of the cable holder (50).

24. High-pressure cleaning device according to one of the preceding claims, characterized in that at least one accessory holder (51a, 51b) and / or a storage space (51) is arranged on the outer housing (12).

25. High-pressure cleaning device according to one of the preceding claims, characterized in that the outer housing (12) has two outer housing half-shells (24, 26), wherein the motor pump unit (14) is positioned between the outer housing half-shells (24, 26).

26. High-pressure cleaning device according to one of the preceding claims, characterized in that the outer housing (12) has a honeycomb-like reinforcing structure (27) on the inside.

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