Air-cooled high-pressure cleaning equipment

Abstract

The present invention relates to an air-cooled high-pressure cleaning tool (10), comprising an outer housing (12), a motor-pump unit (14) housed within the outer housing (12), the motor-pump unit (14) having a pump (16) and an electric motor (17) for driving the pump (16), and a cooling air duct system (49) arranged or formed within the outer housing (12) for cooling air for cooling the motor-pump unit (14), the cooling air duct system (49) being in flow communication with the atmosphere through a housing opening. In order to further develop a high-pressure cleaning appliance (10) of the type mentioned at the outset so as to have lower noise emissions, it is proposed that the high-pressure cleaning appliance (10) comprises a cover (70) arranged at a distance from the at least one housing opening, a gap (55) being arranged between the cover (70) and the at least one housing opening, and the at least one housing opening being in flow connection with the atmosphere via the gap (55).

Description

[Technical Field]

[0001] The present invention relates to an air-cooled high-pressure cleaning tool comprising an outer housing, a motor-pump unit accommodated within the outer housing, the motor-pump unit having a pump and an electric motor for driving the pump, and a cooling air duct system arranged or formed within the outer housing for cooling air for cooling the motor-pump unit, the cooling air duct system being in flow communication with the atmosphere via a housing opening. [Background technology]

[0002] During operation of a high-pressure cleaning tool, the motor-pump unit heats up. Therefore, to reduce the risk of damage due to overheating and ensure reliable operation of the high-pressure cleaning tool, the motor-pump unit must be adequately cooled. Cooling can be achieved by air or water. Water cooling requires complex structural implementation and a greater amount of material than air cooling. To provide effective air cooling, it is necessary to convey as much cooling air flow as possible over the motor-pump unit. For this purpose, it is known to form a cooling air duct system within the outer housing to cool the motor-pump unit, through which the cooling air can flow. The flowing cooling air can result in significant operating noise emissions during operation of the high-pressure cleaning tool. It is desirable to keep noise emissions as low as possible to make the work as comfortable as possible for the user and to meet any possible sound insulation requirements.

[0003] A generic high-pressure cleaning tool is known from WO 2017 / 060003 A1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] WO 2017 / 060003 A1 Summary of the Invention [Problem to be solved by the invention]

[0005] It is therefore an object of the present invention to further develop a high-pressure cleaning appliance of the type mentioned at the outset in such a way that it has lower noise emissions. [Means for solving the problem]

[0006] This object is achieved according to the invention in that in a high-pressure cleaning tool of a general type, the high-pressure cleaning tool comprises a cover arranged at a distance from at least one housing opening, a gap being arranged between said cover and said at least one housing opening, said at least one housing opening being in flow connection with the atmosphere via said gap.

[0007] A cooling air duct system, through which cooling air flows to cool the motor-pump unit of the high-pressure cleaning tool, is flow-connected to the atmosphere via a housing opening. A cover is associated with at least one housing opening, and the cover is positioned at a distance from the at least one associated housing opening, forming a gap between the cover and the at least one associated housing opening. The at least one housing opening is flow-connected to the atmosphere via the gap. The cover being positioned at a distance from the at least one housing opening has the effect, on the one hand, that noise emanating from the at least one housing opening impinges on the cover and is thereby effectively attenuated. On the other hand, the cooling air is redirected. In practice, it has been shown that noise emissions caused by the flow of the cooling air can be reduced by redirecting the cooling air. Thus, the noise emissions caused by the operation of the high-pressure cleaning tool can be kept low using such an embodiment of the present invention.

[0008] The cover advantageously defines a cover opening that opens into the gap, thereby enabling a large volume of cooling air to be provided through the cover opening in order to achieve effective cooling of the motor-pump unit.

[0009] The cover opening is preferably arranged laterally offset from the at least one housing opening which is in flow communication with the atmosphere via the gap. Due to the offset arrangement of the cover opening relative to the housing opening, the redirection of the cooling air flow can be achieved in a simple manner. As already explained, the noise emissions caused by the flow of the cooling air can be reduced by redirecting the cooling air.

[0010] The cover may be of one piece construction.

[0011] For ease of manufacture, it is advantageous if the cover is of multi-part construction, so that the tools for manufacturing the components forming the cover can be designed with a simple structure.

[0012] For easy structural implementation, said cover is advantageously configured as part of the outer housing.

[0013] For particularly effective noise reduction, it is advantageous if the at least one housing opening flow-connected with the atmosphere via the gap forms a housing inlet opening, and the cooling air duct system comprises a first cooling air duct through which cooling air can be supplied to the motor-pump unit and flow-connected with the atmosphere via the housing inlet opening. It has been shown that high noise emissions occur on the inlet side. By covering the at least one housing inlet opening, an effective reduction in noise emissions is possible.

[0014] In an advantageous embodiment of the present invention, the first cooling air duct comprises a duct piece and a cooling air collection space, the duct piece being flow-connected to the cooling air collection space via a flow passage, the at least one housing inlet opening being adjacent to the cooling air collection space on the upstream side, and the cross-section of the cooling air collection space relative to the direction of the cooling air flowing through the cooling air collection space being larger than the cross-section of the duct piece. In such an embodiment of the present invention, a lower flow velocity of the cooling air in the cooling air collection space is possible compared to the flow velocity of the cooling air in the duct piece. Faster-flowing cooling air can generate more noise than slower-flowing cooling air. Because the cross-section of the cooling air collection space is larger than the cross-section of the duct piece located downstream of the cooling air collection space, the acceleration of the cooling air for effective cooling can be shifted into the duct piece and thus to the interior of the outer housing, further reducing the resulting noise emissions.

[0015] Advantageously, the high-pressure cleaning tool has a plurality of housing inlet openings arranged at a distance from one another and opening directly into the cooling air collection space, which makes it possible to form the cooling air collection space with a large cross section in a structurally simple manner.

[0016] The high pressure cleaning tool may have one single housing inlet opening.

[0017] For structurally simple implementation, the at least one housing inlet opening is preferably located on the bottom surface of the outer housing.

[0018] The cooling air duct system is advantageously at least partially lined on the inside with a sound-absorbing material, such as a foam material, which can attenuate in particular the noise from the motor-pump unit and the noise caused by the flow of the cooling air in the cooling air duct system, thereby further reducing the noise emissions of the high-pressure cleaning tool.

[0019] Advantageously, the cooling air duct system is of an angled configuration and the cooling air flowing through the cooling air duct system is redirected at least once. The angling of the cooling air duct system and the redirection of the cooling air have been shown to facilitate reducing the noise emissions.

[0020] The cooling air duct system preferably extends at least partially between an outer wall of the outer housing and at least one further duct wall constituted or formed by the outer housing and arranged at a distance from the outer wall of the outer housing, as a result of which the at least one cooling air duct can be integrated into the outer housing in a structurally simple manner.

[0021] Advantageously, the motor pump unit is supported on the outer housing by a damping element, which reduces the transmission of vibrations from the motor pump unit to the outer housing, thereby reducing noise emissions due to structure-borne sound.

[0022] For a compact design, the motor-pump unit is advantageously arranged between duct sections of the cooling air duct system that run parallel to one another. Such an arrangement allows for a relatively long flow path. Thus, a relatively long air flow within the outer housing is possible with a compact design. This allows for a further reduction in noise emissions.

[0023] Advantageously, the motor-pump unit comprises a pump inlet conduit and a pump outlet conduit passing through duct pieces of the cooling air duct system, the pump inlet conduit and the pump outlet conduit passing through flow openings each of which is provided with a respective sealing element annularly surrounding the pump inlet conduit and the pump outlet conduit, respectively. The risk of uncontrolled cooling air flow is reduced by the sealing elements. The sealing elements may also have a damping effect, thereby further reducing the noise emissions.

[0024] The motor pump unit preferably comprises a fan wheel driven by an electric motor, the fan wheel drawing cooling air through the at least one housing inlet opening, the gap and the first cooling air duct and delivering the air to the motor pump unit.

[0025] Advantageously, the motor-pump unit is surrounded by an inner housing, which inner housing comprises an inner housing opening, via which the cooling air duct system and the inner housing are flow-connected to one another. A further reduction in noise emissions can be achieved by the inner housing. Furthermore, the inner housing thereby makes it possible to guide the cooling air flow in a targeted manner over the motor-pump unit in order to provide particularly effective cooling.

[0026] In order to guide the cooling air in a particularly targeted manner, it is advantageous if the inner housing is provided with an air guiding sleeve which projects into the cooling air duct of the cooling air duct system and which is provided with an inner housing opening at the end which projects into the cooling air duct.

[0027] It is advantageous if at least one sealing element is arranged on the edge of the inner housing opening to establish a tight flow connection between the cooling air duct system and the inner housing, which ensures that the tightest possible flow connection between the cooling air duct system and the inner housing is established, thereby minimizing possible flow noise of the cooling air as it passes through the cooling air duct system to the inner housing.

[0028] In order to generate a particularly effective cooling air flow, the fan wheel is advantageously arranged in an inner housing opening of the inner housing.

[0029] The cooling air supplied to the motor-pump unit can be discharged to the atmosphere via at least one housing opening in flow communication with the atmosphere, the housing opening being configured as a housing outlet opening.

[0030] Advantageously, a cable holder is arranged on the outer housing and has at least one air outlet opening, the housing outlet opening being arranged upstream of the at least one air outlet opening and at a distance from the at least one air outlet opening in the flow direction of the cooling air. In such an embodiment of the invention, the cooling air can move to the atmosphere via the at least one housing outlet opening and the downstream-arranged air outlet opening of the cable holder. This allows, on the one hand, a reduction in the noise emissions at the outlet side and, on the other hand, a space-saving integration of the cable holder, around which, for example, a cable for supplying energy to the high-pressure cleaning tool can be wound.

[0031] It is particularly advantageous if the high-pressure cleaning tool has at least one first housing outlet opening and at least one second housing outlet opening, through which cooling air can be discharged directly to the atmosphere, and if the at least one second housing opening is arranged upstream of the at least one air outlet opening of the cable holder.

[0032] For easy handling of the high-pressure cleaning tool, it is advantageous if at least one accessory holder and / or storage space is arranged on the outer housing. For example, accessories, in particular a spray gun and / or a spray lance, can be arranged in the accessory holder. Further accessories, such as a pressure hose or a cleaning cloth, can be stored in the storage space.

[0033] For easy assembly, the outer housing comprises two outer housing half shells, the motor pump unit being arranged between the outer housing half shells.

[0034] For the stability of the outer housing, it is advantageous if the outer housing is provided with an internal honeycomb-like reinforcing structure, by means of which good stability is achieved at the same time as a lightweight structure.

[0035] The following description of preferred embodiments of the invention, taken in conjunction with the drawings, serves to further explain the invention. [Brief explanation of the drawings]

[0036] [Figure 1] 1 is a perspective view of a high pressure cleaning appliance with an outer housing having two outer housing half shells. [Figure 2] Partially split side view of a high pressure cleaning appliance. [Figure 3] Bottom view of a high pressure washer appliance. [Figure 4] 3 is a perspective view of the high-pressure cleaning appliance in the direction of arrow A in FIG. 2 , with the outer housing half shell of the outer housing facing the viewer and hidden. [Figure 5] 5 is a view corresponding to FIG. 4, in which the inner housing half-shell of the inner housing surrounding the motor-pump unit is further hidden. [Figure 6] 6 is a view corresponding to FIG. 5, in which the motor pump unit and the further inner housing half-shell of the inner housing are hidden. DETAILED DESCRIPTION OF THE INVENTION

[0037] A preferred embodiment of an air-cooled high-pressure cleaning appliance according to the present invention is shown generally in the drawings and is designated generally by the reference numeral 10.

[0038] The high pressure cleaning tool 10 comprises an outer housing 12 and a motor pump unit 14 housed within the outer housing 12, the motor pump unit 14 comprising a pump 16 and an electric motor 17 which drives the pump 16 via a belt drive 18. The electric motor 17 also drives a fan wheel 19.

[0039] The pump 16 comprises a pump inlet conduit 20 having a pump inlet 21, through which the 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 by the pump 16 via a pump outlet conduit 22. The pump outlet conduit 22 comprises a pump outlet 23 to which a liquid dispensing conduit, such as a pressure hose, can be connected, which is known and therefore not shown in the drawings for a clearer overview.

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

[0041] Internally, the two outer housing half-shells 24, 26 each include a honeycomb-like reinforcing structure 27.

[0042] The outer housing 12 includes a front surface 28 and a rear surface 30. The front surface 28 and the rear surface 30 are connected to each other by a first housing narrow side 32 and a second housing narrow side 34 located opposite the first housing narrow side 32. In the upright use position of the pressure cleaning tool 10 shown in Figures 1 to 6, the housing narrow sides 32, 34 are oriented vertically. Furthermore, the outer housing 12 includes a top surface 36 and a bottom surface 38.

[0043] The first foot 40 and the second foot 42 are disposed on the bottom surface 38 of the outer housing 12. The feet 40, 42 are U-shaped and have first legs 40a, 42a and second legs 40b, 42b, respectively, which are connected to each other via webs 40c, 42c. In the upright use position, the pressure cleaning tool 10 stands with the webs 40c, 42c of the feet 40, 42 resting on the mounting surface 44.

[0044] A handle 46 for carrying the pressure cleaning tool 10 is located on the top surface 36 of the outer housing 12.

[0045] A rotary switch 48 is located on the front face 28 of the outer housing 12 for turning the pressure cleaning tool 10 on and off.

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

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

[0048] A cable holder 50 is arranged on the second housing narrow side 34, and a user can wind a cable, for example for supplying energy to the high-pressure cleaning tool 10, onto the cable holder 50, the cable being not shown in the figure.

[0049] Walls constituted or formed by the outer housing 12, for example, outer walls or duct walls forming the cooling air duct system 49 for cooling the air for cooling the motor-pump unit 14, are described below. The respective walls are formed together by the outer housing half-shells 24, 26. The structure of the outer housing 12 with its corresponding walls is described below using the example of the first outer housing half-shell 24. The description also applies to the second outer housing half-shell 26 which forms these walls together with the first outer housing half-shell 24.

[0050] The outer housing 12 has a double-walled bottom surface 38 and, to this end, comprises an outer wall 52 and an inner wall 54, which are spaced apart from one another to form a gap 55 therebetween. This is particularly evident in FIG. 2. The inner wall 54 comprises a plurality of housing inlet openings 56 that are in flow communication with the gap 55. Cooling air can flow through the gap 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.

[0051] The outer wall 52 forms a cover 60 associated with and spaced apart from the housing inlet opening 56, covering the housing inlet opening 56 toward the atmosphere and defining a gap 55 downward. The cover 60 is multi-piece and includes 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 associated with the first outer housing half-shell 24 is formed by the wall of the outer housing 12 in the region of the front face 28 of the outer housing 12, while the first cover piece 63 associated with the second outer housing half-shell 26 is formed by the wall of the outer housing 12 in the region of the rear face 30 of the outer housing 12. The second cover pieces 64, 65 are respectively positioned between the first legs 40a, 42a and the second legs 40b, 42b of the feet 40, 42 and overlap the first cover pieces 62, 63.

[0052] The second cover pieces 64, 65 are spaced apart from one another such that a cover opening 66 is formed between the second cover pieces 64, 65. The cover opening 66 is in flow communication with the housing inlet opening 56 through the gap 55. Furthermore, the cover opening 66 is laterally offset from the housing inlet opening 56 such that the flowing cooling air is redirected within the gap 55.

[0053] The first cooling air duct 58 of the cooling air duct system 49 includes a cooling air collection space 70 and a duct piece 72. The first cooling air duct 58 is configured such that the cooling air collection space 70 is adjacent to the housing inlet opening 56 relative to the cooling air flow direction 59. The cooling air collection space 70 is connected to the duct piece 72 via a flow passage 74. With respect to the upright use position of the high-pressure cleaning tool 10, the cooling air collection space 70 is defined downwardly by the inner wall 54 and upwardly by a horizontally disposed first upper wall portion 76 and a horizontally disposed second upper wall portion 77. The flow passage 74 is disposed between the two upper wall portions 76, 77. The upper wall portions 76, 77 transition outwardly into side wall portions 78, 79, respectively, which connect the first upper wall portion 76 and the second upper wall portion 77 to the inner wall 54 of the outer housing 12. The side wall portions 78, 79 each form a lateral boundary of the cooling air collection space 70. Relative to the direction of the cooling air flowing through the first cooling air duct 58, the cooling air collection space 70 has a larger cross section than the duct piece 72.

[0054] The flow passage 74 is adjacent to a first duct portion 80 of the duct piece 72 in the cooling air flow direction 59. The first duct portion 80 extends horizontally relative to the upright use position of the high-pressure cleaning tool 10 and parallel to the cooling air collection space 70. The first duct portion 80 is defined downwardly by a second upper wall portion 77 of the cooling air collection space 70 and upwardly by a first duct wall 82 that is spaced apart from and extends parallel to the second upper wall portion 77. A duct web 84 connects the first duct wall 82 to the first upper wall portion 76 of the cooling air collection space 70. The duct web 84 forms the upstream boundary of the first duct portion 80 on the face side.

[0055] The first duct section 80 is adjacent to a second duct section 86, which extends perpendicularly to the upright use position of the high-pressure cleaning tool 10, in the cooling air flow direction 59. The second duct section 86 is bounded, on the one hand, by the wall of the outer housing 12 in the region of the first housing narrow side 32, and, on the other hand, by a second duct wall 88, which extends parallel to this wall in the upright use position of the high-pressure cleaning tool 10 in the vertical direction. The first duct wall 82 merges into the second duct wall 88, which comprises 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 housing narrow side 32 and forms, on the face side, the downstream boundary of the first cooling air duct 58.

[0056] The pump inlet conduit 20 and the pump outlet conduit 22 pass through a second duct portion 86 of the duct piece 72 of the first cooling air duct 58. The second duct wall 88 and the wall of the outer housing 12 in the region of the first housing narrow side 32 therefore have flow passage openings 94, 95, 96, 97. Sealing elements 98, 99 are arranged at the flow passage openings 94, 96 of the second duct wall 88 to prevent the flow of cooling air through the flow passage openings 94, 96. The sealing elements 98, 99 are arranged annularly around the pump inlet conduit 20 and the pump outlet conduit 22, respectively.

[0057] The first cooling air duct 58 is partially lined on the inside with a sound-absorbing material 100, which may be, for example, a foam material. The sound-absorbing material 100 is arranged in the first cooling air duct 58 along the second upper wall portion 77 of the cooling air collection space 70, which defines the first duct section 80 below, and extends inwardly along the wall of the outer housing 12 in the region from the first housing narrow side surface 32 to the third duct wall 92.

[0058] 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 housing narrow side surface 34. The cooling air can be discharged directly to the atmosphere through the first housing outlet openings 102, but the cable holder 50 arranged on the second housing narrow side surface 34 also 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 moves to the atmosphere through the air outlet openings 104 of the cable holder 50. This makes it possible to further reduce noise emissions on the outlet side.

[0059] The second cooling air duct 106 comprises a first duct section 108 and a second duct section 110 .

[0060] The first duct portion 108 extends perpendicular to the upright use position of the high-pressure cleaning tool 10. The first duct portion 108 is defined by a wall of the outer housing 12 in the region of the second housing narrow side 34 and a first duct wall 112 oriented parallel to said wall and spaced apart from said wall. 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 housing narrow side 34. The second duct wall 114 forms the downstream boundary of the first duct portion 108 of the second cooling air duct 106 on its face side.

[0061] The first duct portion 108 of the second cooling air duct 106 is adjacent upstream to a second duct portion 110 that extends horizontally relative to the upright use position of the high-pressure cleaning tool 10. The second duct portion 110 is bounded downward by the first upper wall portion 76 of the cooling air collection space 70 and upward by a third duct wall 118. The first duct wall 112 and the third duct wall 118 merge into each other. The upstream boundary of the second duct portion 110 of the second cooling air duct 106 on the face side is formed by the duct web 84, which also forms the face-side boundary of the first duct portion 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 to define a duct opening 120 .

[0062] The second cooling air duct 106, like the first cooling air duct 58, is partially lined with an acoustic absorption material 100. The acoustic absorption material 100 is disposed within the second cooling air duct 106 along a first duct wall 112 that defines the first duct portion 108 and along a third duct wall 118 that defines the second duct portion 110. Additionally, the acoustic absorption material 100 is disposed on the first upper wall portion 76 of the cooling air collection space 70 that defines the second duct portion 110 below, and extends to the duct web 84.

[0063] Between the first cooling air duct 58 and the second cooling air duct 106 , the cooling air duct system 49 includes an accommodation space 122 .

[0064] The accommodation space 122 is surrounded by an inner housing 124, in which the motor pump unit 14 is disposed. The inner housing 124 includes two inner housing half shells 125, 127.

[0065] Furthermore, the inner housing 124 comprises 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 through the duct opening 90 and the first inner housing opening 126. The second cooling air duct 106 opens into the inner housing 124 through 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 portion 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 connection with each other via the inner housing 124.

[0066] A sealing element 130 is disposed at the edge of the first inner housing opening 126 to establish a tight flow connection between the first cooling air duct 58 and the inner housing 124 .

[0067] The fan wheel 19 is disposed in the first inner housing opening 126 .

[0068] Sealing elements 132 , 133 are disposed in the second inner housing opening 128 to establish a tight flow connection between the inner housing 124 and the second cooling air duct 106 .

[0069] The inner housing 124 is supported on the outer housing 12 by damping elements 134. The sealing elements 98, 99, 130, 132, 133 further function as damping elements to achieve acoustic decoupling of the motor pump unit 14 from the outer housing 12.

[0070] During operation of the high-pressure cleaning tool 10, cooling air drawn in by the fan wheel 19 first flows through the cover opening 66, the gap 55, and the housing inlet opening 56 into the cooling air collection space 70 of the first cooling air duct 58. The offset of the cover opening 66 relative to the housing inlet opening 56 redirects the cooling air. The cooling air exits the cooling air collection space 70 and flows through the flow path 74 into the first duct section 80 of the duct piece 72, where it is redirected again. At the transition from the first duct section 80 to the second duct section 86, the cooling air is redirected again. 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, providing a further redirection of the cooling air. In the inner housing 124, the cooling air is directed over the electric motor 17 and the pump 16 of the motor-pump unit 14. The cooling air thereby cools the motor-pump unit 14 and dissipates heat generated by the operation of the high-pressure cleaning tool 10. The cooling air passes through the second inner housing opening 128 and the duct opening 120 of the second cooling air duct 106 into the second duct section 110 of the second cooling air duct 106, whereby it is redirected again. From the second duct section 110, the cooling air flows into the first duct section 108, whereby it is redirected again. At the end of the first duct section 110, the cooling air can exit the outer housing 12 through the air outlet opening 104 of the cable holder 50, which is in flow communication with the first housing outlet opening 102 and the second housing outlet opening 103.

Claims

1. The invention comprises an outer housing (12), a motor pump unit (14) accommodated in the outer housing (12), the motor pump unit (14) having a pump (16) and an electric motor (17) for driving the pump (16), a cooling air duct system (49) for cooling air for cooling the motor-pump unit (14), arranged or formed within the outer housing (12), the cooling air duct system (49) being in flow connection with the atmosphere via a housing opening; In air-cooled high-pressure cleaning equipment, The high-pressure cleaning tool (10) comprises a cover (60) positioned at a distance from at least one housing opening; A gap (55) is arranged between the cover (60) and the at least one housing opening, and the at least one housing opening is in flow communication with the atmosphere through the gap (55). An air-cooled high-pressure cleaning tool characterized by:

2. 2. The high-pressure cleaning tool of claim 1, wherein the cover (60) defines a cover opening (66) that opens into the gap (55).

3. 3. The high pressure cleaning appliance of claim 2, wherein the cover opening (66) is laterally offset from the at least one housing opening that is in flow communication with the atmosphere through the gap (55).

4. 4. A high pressure cleaning tool according to any one of claims 1 to 3, characterized in that the cover (60) is of multi-part construction.

5. 5. The high pressure cleaning tool according to any one of claims 1 to 4, wherein the cover (60) is configured as part of the outer housing (12).

6. 6. The high-pressure cleaning appliance according to claim 1, wherein at least one housing opening that is in flow communication with the atmosphere through the gap (55) forms a housing inlet opening (56), and the cooling air duct system (49) comprises a first cooling air duct (58) through which cooling air can be supplied to the motor-pump unit (14) and that is in flow communication with the atmosphere through the housing inlet opening (56).

7. 7. The high-pressure cleaning tool of claim 6, wherein the first cooling air duct (58) comprises a duct piece (72) and a cooling air collection space (70), the duct piece (72) being in flow connection with the cooling air collection space (70) via a flow path (74), the at least one housing inlet opening (56) being adjacent to the cooling air collection space (70) on the upstream side, and a cross section of the cooling air collection space (70) relative to the direction of the cooling air flowing through the cooling air collection space (70) being larger than a cross section of the duct piece (72).

8. The high-pressure cleaning tool (10) according to claim 7, characterized in that it comprises a plurality of housing inlet openings (56) arranged at a distance from each other and opening directly into the cooling air collection space (70).

9. The high pressure cleaning appliance according to any one of claims 6 to 8, characterized in that the at least one housing opening (56) is located in a bottom surface (38) of the outer housing (12).

10. 10. The high pressure cleaning appliance according to any one of the preceding claims, characterized in that the cooling air duct system (49) is at least partially lined with a sound absorbing material (100).

11. 11. The high pressure cleaning appliance of any one of claims 1 to 10, wherein the cooling air duct system (49) is of an angled configuration and the cooling air flowing through the cooling air duct system (49) is redirected at least once.

12. 12. The high-pressure cleaning appliance according to any one of claims 1 to 11, characterized in that the cooling air duct system (49) extends at least partially between an outer wall of the outer housing (12) and at least one further duct wall (88, 112) constituted or formed by the outer housing (12) and arranged at a distance from the outer wall of the outer housing (12).

13. 13. A high-pressure cleaning tool according to any one of claims 1 to 12, characterized in that the motor-pump unit (14) is supported on the outer housing (12) by damping elements (98, 99, 130, 132, 133, 134).

14. 14. The high-pressure cleaning tool according to any one of claims 1 to 13, characterized in that the motor pump unit (14) is arranged between duct sections (86, 108) of the cooling air duct system (49) that run parallel to each other.

15. 15. The high-pressure cleaning tool according to any one of claims 1 to 14, characterized in that the motor pump unit (14) comprises a pump inlet conduit (20) and a pump outlet conduit (22) passing through a duct piece (72) of the cooling air duct system (49), the pump inlet conduit (20) and the pump outlet conduit (22) passing through flow passage openings (94, 96) each having a respective sealing element (98, 99) annularly surrounding the pump inlet conduit (20) and the pump outlet conduit (22), respectively.

16. 16. The high-pressure cleaning tool according to any one of claims 1 to 15, characterized in that the motor pump unit (14) comprises a fan wheel (19) driven by the electric motor (17) for conveying cooling air to the motor pump unit (14).

17. 17. The high-pressure cleaning tool according to any one of claims 1 to 16, characterized in that the motor pump unit (14) is surrounded by an inner housing (124), the inner housing (124) having inner housing openings (126, 128), through which the cooling air duct system (49) and the inner housing (124) are flow-connected to each other.

18. 18. The high-pressure cleaning tool of claim 17, wherein the inner housing (124) projects into the cooling air duct (106) of the cooling air duct system (49) and comprises an air guide sleeve (129) having an inner housing opening (128) at the end projecting into the cooling air duct (106).

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

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

21. 21. A high-pressure cleaning tool according to any one of claims 1 to 20, characterized in that the cooling air supplied to the motor pump unit (14) is discharged to the atmosphere via at least one housing opening that is in flow connection with the atmosphere, the housing opening being configured as a housing outlet opening (102, 103).

22. 22. The high-pressure cleaning tool according to claim 21, characterized in that a cable holder (50) is arranged on the outer housing (12) and has at least one air outlet opening (104), and a housing outlet opening (103) is arranged upstream of the at least one air outlet opening (104) and at a distance from the at least one air outlet opening (104) in the flow direction (59) of the cooling air.

23. 23. The high-pressure cleaning tool of claim 22, characterized in that the high-pressure cleaning tool comprises at least one first housing outlet opening (102) and at least one second housing outlet opening (103), through which cooling air can be directly discharged to the atmosphere, and the at least one second housing outlet opening (103) is arranged upstream of the at least one first air outlet opening (104) of the cable holder (50).

24. 24. The high-pressure cleaning appliance according to any one of claims 1 to 23, characterized in that at least one accessory holder (51a, 51b) and / or storage space (51) is arranged on the outer housing (12).

25. 25. The high-pressure cleaning tool according to any one of claims 1 to 24, characterized in that the outer housing (12) comprises two outer housing half-shells (24, 26), and the motor-pump unit (14) is arranged between the outer housing half-shells (24, 26).

26. A high pressure cleaning appliance according to any one of the preceding claims, characterized in that the outer housing (12) is provided with an internal honeycomb-like reinforcing structure (27).

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