AIR-COOLED HIGH-PRESSURE CLEANER

Description

[0001] The invention relates to an air-cooled high-pressure cleaning device, comprising a housing and a motor pump unit accommodated therein with a motor and a high-pressure pump driven by the motor, as well as at least one cooling air duct arranged or formed in the housing for cooling air for cooling the motor pump unit, which cooling air duct is fluidly connected to the atmosphere via at least one housing opening.

[0002] Water cooling and air cooling are used to cool high-pressure cleaning equipment. Water cooling can effectively cool the motor pump unit, but requires more equipment than air cooling. To ensure effective air cooling, the motor pump unit should be supplied with the highest possible volume flow of cooling air. For this purpose, it is known to create at least one cooling air duct in the housing through which cooling air is supplied to the motor pump unit, for example, from the atmosphere. In practice, airborne noise due to the flowing cooling air and structure-borne noise due to the motor pump unit in operation lead to a not insignificant emission of operating noise.It is desirable to keep noise emissions as low as possible in order to make working with the high-pressure cleaning device as pleasant as possible for the user and to meet any sound insulation requirements.

[0003] DE 41 06 955 A1 and EP 0 503 298 A1, which has the same content, describe an air-cooled high-pressure cleaning device.

[0004] DE 10 2008 009 246 A1 and WO 2014 / 000824 A1 also describe air-cooled high-pressure cleaning devices.

[0005] DE 103 05 812 A1 describes a high-pressure cleaning device with a housing and a motor-pump unit, which is arranged within the housing and completely surrounded by a sound-absorbing material. In a first embodiment, the inflowing fluid is used to cool the motor of the motor-pump unit. In a second embodiment, air cooling is used.

[0006] Another air-cooled high-pressure cleaning device is described in DE 295 22 275 U1.

[0007] The object of the present invention is to provide a high-pressure cleaning device of the type mentioned above which has a lower noise emission.

[0008] This object is achieved by a high-pressure cleaning device according to the invention having the features of claim 1.

[0009] The high-pressure cleaning device according to the invention includes an air guide part that at least partially surrounds the motor pump unit. Cooling air can flow through the at least one cooling air duct and the air guide part, thereby ensuring effective cooling of the motor pump unit. At least one cooling air duct is provided, in particular a cooling air duct through which cooling air from the atmosphere is supplied to the air guide part. Alternatively or additionally, it can be provided that cooling air is released from the air guide part into the atmosphere via a cooling air duct. The at least one cooling air duct enables the cooling air flow to be evened out, so that the noise emission due to the air flow in the high-pressure cleaning device according to the invention can be kept as low as possible. In addition, the damping elements, via which the air guide part is supported on the housing, are provided.The damping elements ensure vibration isolation of the air guide element from the housing. The air guide element can be supported via the damping elements, for example, on housing walls located within or formed by the housing, or on other types of support elements (projections, bases, partition walls, etc.). Vibration isolation further reduces the noise emissions of the high-pressure cleaning device caused by structure-borne sound, resulting in a particularly quiet high-pressure cleaning device.

[0010] The at least one cooling air duct is formed, at least in sections, between an outer wall of the housing and at least one further duct wall enclosed or formed by the housing, spaced apart from the outer wall. The at least one cooling air duct can thus be formed integrally by the housing. The outer wall can form a wall of the cooling air duct, at least in sections, in order to simplify the design of the at least one cooling air duct.

[0011] It is advantageous if the air guide part is free from direct contact with the housing and / or walls of the at least one cooling air duct. Vibrations of the air guide part are thus not directly transmitted to the housing, especially to the walls of the at least one cooling air duct. Instead, the damping elements act to dampen vibrations of the air guide part.

[0012] Accordingly, it is advantageous if the motor pump unit is free from direct contact with the housing and / or walls of the at least one cooling air duct.

[0013] The air guide member preferably extends over the entire or substantially the entire length of the motor pump unit. This allows a defined cooling air flow to be ensured over the entire or substantially the entire length of the motor pump unit. Individual sections of the motor pump unit, such as a pump head, a pump inlet, or a pump outlet on a front side of the motor pump unit, can be arranged entirely or partially outside the air guide member.

[0014] It is advantageous if the air guide part surrounds the motor pump unit in a jacket-like manner and has an opening on at least one end side, in particular an end face, through which the at least one air guide channel and the air guide part open into one another. The air guide part can surround the motor pump unit on all sides in the circumferential direction and, for this purpose, can have, for example, a cylindrical or substantially cylindrical shape. An opening is preferably present on at least one end side, in particular at least one of the end faces of the air guide part, through which opening a flow connection between the interior of the air guide part and the at least one cooling air channel is ensured.

[0015] A sealing element is preferably arranged at the edge of the at least one opening to provide a tight flow connection between the at least one cooling air duct and the air guide part. The sealing element, for example an annular seal, ensures the tightest possible flow connection. Any noise from the flowing cooling air that could otherwise escape between the at least one cooling air duct and the air guide part can be avoided in this way. The sealing element can also have a damping effect and, in particular, provide a damping element. This can create an additional vibration-decoupling effect between the air guide part and the at least one cooling air duct at the edge of the at least one opening.

[0016] Advantageously, the motor-pump unit has a fan impeller driven by a motor shaft, which is arranged at an opening in the air guide part and conveys cooling air over the motor-pump unit. The fan impeller is positioned, for example, at a front opening and conveys the cooling air over the motor and pump through the air guide part. This ensures effective cooling of the motor-pump unit.

[0017] It can be provided that a pump inlet line and / or a pump outlet line are routed out of the air guide part through an end opening of the air guide part, or that a pump head of the high-pressure pump passes through the opening. The pump inlet line for supplying pressurized cleaning fluid and / or the pump outlet line for pressurized cleaning fluid can, for example, be routed through the opening of the air guide part and through the cooling air duct, exiting the housing.

[0018] In a different embodiment, it can be provided that the pump inlet line and / or the pump outlet line are led out of the air guide part laterally, for example transversely to the axial direction.

[0019] It is advantageous if the housing has or forms housing walls, between which and the air guide part, the damping elements are positioned for support against the housing walls. The housing walls are arranged or formed inside the housing. The air guide part rests against the housing walls via the damping elements. In an advantageous embodiment, this allows, for example, to ensure flat support of the air guide part inside the housing, whereby vibrations of the air guide part can be dissipated and dampened over a large area.

[0020] The housing walls are advantageously oriented transversely to an axial direction of the motor pump unit. For example, the housing walls are partition walls or separating walls arranged transversely to the axial direction in the housing.

[0021] It is advantageous if the housing walls are double-walled and the damping elements engage between the wall sections of the double-walled housing walls. This makes it possible to fix the damping elements to the housing walls and secure the position of the air guide part within the housing. For example, the damping elements can be supported axially on the wall sections of the housing walls to prevent axial movement of the air guide part. Radial movement of the air guide part can be prevented, for example, by webs connecting the wall sections, on which the damping elements can also be supported.

[0022] In an advantageous embodiment of the high-pressure cleaning device according to the invention, it is favorable if the damping elements are ring-shaped or ring-segment-shaped and each at least partially surround the air guide part. Advantageously, the damping elements are arranged in a plane transverse to an axial direction of the motor-pump unit. It can advantageously be provided that the damping elements are ring-segment sections, at least two of which are arranged at an axial position of the motor-pump unit. This is advantageous, for example, if, as will be discussed below, the housing is constructed from housing half-shells. Each segment can be positioned on a housing half-shell. The motor-pump unit, with the air guide part surrounding it, can then be inserted into the housing half-shell.The additional housing half-shell, with the additional segment attached to it, can then be positioned over the first housing half-shell and joined together. This makes assembly of the high-pressure cleaning device particularly easy.

[0023] It is advantageous if, relative to an axial direction of the motor-pump unit, at least one damping element is arranged at at least two spaced-apart positions for supporting the air guide part on the housing. For example, there are two axial positions, each of which has at least one damping element. For example, a pair of ring-segment-shaped damping elements is provided at each position.

[0024] The damping elements are made of a rubber material or a plastic material, for example.

[0025] The damping elements can be provided for removal after opening the housing, and in particular for manual removal. This makes replacing damping elements as the high-pressure cleaner ages easier, allowing the quiet operation of the high-pressure cleaner to be maintained.

[0026] The at least one additional duct wall is preferably free of contact with the damping elements. Any vibrations not absorbed by the damping elements are thus not directly transmitted to the duct wall. In practice, this proves advantageous for further reducing noise emissions.

[0027] It is advantageous if the at least one cooling air duct runs with a duct section in a longitudinal direction of the high-pressure cleaning device and preferably extends in the transverse direction of the high-pressure cleaning device across its entire or substantially entire width. The at least one cooling air duct can in particular extend across the entire or substantially entire length of the high-pressure cleaning device. The high-pressure cleaning device can thus have a compact design. The motor pump unit with the air guide part is accommodated in the interior formed by the housing and supported on the housing via the damping elements. The at least one cooling air duct can run across the entire length and / or width of the high-pressure cleaning device.

[0028] Advantageously, the at least one cooling air duct is lined on the inside, at least in sections, with a sound-absorbing material. The sound-absorbing material, for example, a foam material, can further reduce noise emissions. In particular, noise from the motor pump unit can be absorbed. Furthermore, flow noise of the cooling air in the cooling air duct is dampened by the sound-absorbing material.

[0029] In an advantageous embodiment of the high-pressure cleaning device according to the invention, the at least one cooling air duct is angled, and the cooling air flowing through the at least one cooling air duct undergoes at least one deflection. It has been shown in practice that at least one deflection can reduce the noise emissions caused by the air flow. In the area of ​​the bend, which advantageously results in a deflection of the cooling air of approximately 90°, the at least one cooling air duct is advantageously lined with a sound-absorbing material.

[0030] The motor pump unit is advantageously aligned parallel to a duct section of the at least one cooling air duct, and the cooling air flowing through the duct section and the air guide part is advantageously deflected twice, preferably by approximately 90° each time. The cooling air flowing through the duct section and through the air guide part can accordingly flow in opposite directions. With a compact design of the high-pressure cleaning device, this enables a relatively long air flow within the housing and achieves a high level of noise reduction. In this embodiment, the cooling air advantageously flows approximately along a U through the at least one cooling air duct, which can be L-shaped in cross-section, for example, and the air guide part.

[0031] According to the invention, the high-pressure cleaning device comprises a first cooling air duct through which cooling air from the atmosphere can be supplied to the motor-pump unit, and a second cooling air duct through which cooling air from the motor-pump unit can be discharged into the atmosphere. The air guide part then advantageously has a respective opening at opposite end sides and in particular at the front sides, through which the first cooling air duct opens into the air guide part and through which the air guide part opens into the second cooling air duct.

[0032] It is advantageous for the motor pump unit and the air guide part to be arranged between duct sections of the first and second cooling air ducts that run parallel to the motor pump unit, and for the cooling air to flow along a meander, particularly a rectangular meander, through the first cooling air duct, the air guide part, and the second cooling air duct. Along the rectangular meander, the cooling air is deflected several times, particularly along an "S" or "square S." While maintaining a compact design of the high-pressure cleaning device, a relatively long cooling air flow can be ensured for effective cooling and the lowest possible noise emissions.

[0033] Advantageously, the channel section of the first cooling air channel is arranged above and the channel section of the second cooling air channel is arranged below the motor pump unit.

[0034] Alternatively, the channel sections of the cooling channels can be arranged laterally next to the motor pump unit.

[0035] Position and orientation specifications such as "above," "below," "horizontal," or the like are to be understood as referring to the positioning of the high-pressure cleaning device in a use position on a floor surface considered horizontal. In the use position, a contact plane defined by the high-pressure cleaning device coincides with a contact plane defined by the floor surface.

[0036] It is advantageous if a housing opening through which cooling air enters the first cooling air duct and a housing opening through which cooling air exits the second cooling air duct are arranged on opposite sides of the housing. This prevents heated cooling air exiting the second cooling air duct from directly entering the first cooling air duct. This largely prevents any impairment of the cooling effect. If possible, the housing openings can be arranged on the high-pressure cleaning device with maximum distance from each other.

[0037] Furthermore, it is advantageous if a housing opening through which cooling air enters the first cooling air duct is positioned above a housing opening through which cooling air exits the second cooling air duct, relative to a height direction of the high-pressure cleaning device.

[0038] In particular, the housing opening through which cooling air enters the first cooling air duct is located at the top of the high-pressure cleaner. This ensures that foreign matter or dirt particles are relatively unlikely to be sucked into the first cooling air duct, which is particularly advantageous when the high-pressure cleaner is positioned on a floor surface.

[0039] It proves advantageous if the motor pump unit is oriented horizontally in the housing, whereby in this case, the bottom surface is also assumed to be horizontally oriented. The aforementioned channel sections of the first and / or second cooling air channel, advantageously located above and below the motor pump unit, are then preferably also oriented horizontally.

[0040] The first and / or second cooling air duct may have further duct sections which may be vertically aligned, in particular if the respective cooling air duct has an L-shaped cross-section.

[0041] It is advantageous if the housing has two housing halves, with the motor pump unit and its surrounding air guide positioned between the housing halves and supported by the damping elements on the end faces of the housing walls of each housing half, with several end faces facing the other housing half. This allows for easy assembly of the high-pressure cleaning device.

[0042] The high-pressure pump, for example, is an axial piston pump.

[0043] The following description of a preferred embodiment of the invention, in conjunction with the drawings, serves to explain the invention in more detail. They show: Figure 1: a perspective view of an advantageous embodiment of a high-pressure cleaning device according to the invention, which has a housing with two housing half-shells; Figure 2: a view corresponding Figure 1 , in which the housing is shown open with a housing half-shell facing the viewer and an electrical switching element hidden; Figure 3: a representation corresponding Figure 2 , wherein a motor pump unit of the high-pressure cleaning device accommodated in the housing and an air guide part surrounding it are hidden; and Figure 4: a horizontal sectional view of the high-pressure cleaning device in the closed state of the housing along the line 4-4 in Figure 2 .

[0044] The drawing shows an advantageous embodiment of an air-cooled high-pressure cleaning device according to the invention, designated by the reference numeral 10. The high-pressure cleaning device 10 comprises a housing 12, which in an advantageous embodiment is constructed from two housing half-shells 14, 16. Figure 1 The housing half-shell 14 shown facing the user is in the Figures 2 and 3 hidden to allow a view into the interior of the housing 12.

[0045] The housing 12 has a bottom side 18, a top side 20, a front side 22 and a back side 24. Via the bottom side 12, which defines a contact plane, the high-pressure cleaning device 10 can be positioned in a use position on a floor surface (not shown) assumed to be horizontal.

[0046] The housing 12 is designed like a suitcase and includes a carrying handle 26 on the top side 12 for carrying the high-pressure cleaning device 10.

[0047] The following describes the walls encompassed or formed by the housing 12, for example, an outer wall or channel walls of cooling channels or partition walls. The respective walls are formed jointly by the housing half-shells 14, 16, i.e., in the advantageous embodiment of the high-pressure cleaning device 10, each housing half-shell 14, 16 forms a section of the corresponding wall. The structure of the housing 12 with the corresponding walls is explained below using the example of the housing half-shell 16 ( Figures 2 and 3 ), whereby the corresponding statements also apply to the other housing half-shell 14, which forms these walls together with the housing half-shell 16.

[0048] The housing 12 has an outer wall 28. The outer wall 28 is double-walled on the top side 20 and the bottom side 18 to reinforce the housing 12. A plurality of openings in the outer wall 28 are present at the transition from the top side 20 to the front side 22. These openings are collectively referred to as the housing opening 30.

[0049] Similarly, a plurality of openings are formed in the outer wall 28 at the transition from the bottom side 18 to the rear side 24. These openings are collectively referred to as the housing opening 32.

[0050] At the rear side 24, approximately midway between the bottom side 18 and the top side 20, the outer wall 28 is single-walled. A channel wall 34 branches off from the outer wall 28 into the housing interior, which is connected at the top side 20 to the double-walled section of the outer wall 28.

[0051] Similarly, the outer wall 28 on the front side 22 is single-walled approximately centrally between the bottom side 18 and the top side 20. Above this, the outer wall 28 is double-walled over a small section. Toward the bottom side 18, a channel wall 36 branches off from the outer wall 28 into the interior of the housing 12. This channel wall 36 is connected to the outer wall 28 at the bottom side 18, near the double-walled section of the outer wall 28 there.

[0052] Another channel wall 38 is formed inside the housing 12. The channel wall 38 has four sections. A first section 40 begins at the front 22 below the housing opening 30. The first section 40 slopes slightly upwards and transitions into a second section 42. The second section 42 runs horizontally and parallel to the outer wall 38 at its double-walled portion, approximately the length of the carrying handle 26.

[0053] The second section 42 transitions into an approximately vertically extending third section 44, which extends toward the bottom 18, beyond the center of the high-pressure cleaning device 10 between the top 20 and the bottom 18. The third section 44 has a recess 48 that is semicircular.

[0054] A fourth section 46 connects the third section 44 approximately horizontally to the outer wall 28 at the rear 24.

[0055] Another channel wall 50 is formed inside the housing 12. Starting from the rear side 24 toward the front side 22, the channel wall 50 comprises a first section 52. The first section 52 extends from the outer wall 28 at the rear side 24 above the housing opening 32. The first section 52 slopes slightly toward the underside 18 and merges into a second section 52. The second section 54 runs horizontally and parallel to the outer wall 28 at its double-walled section.

[0056] The second section 54 merges into a third section 56 which is C-shaped in cross section, so that the channel wall 50 is first curved towards the top side 20 and then towards the back side 24.

[0057] The third section 56 is followed by a fourth section 58. The fourth section runs approximately vertically toward the upper side 22 and is provided, for example, with a step 60. The fourth section 58 is connected to the first section 40 or the second section 42 of the channel wall 38. A semicircular recess 62 is formed in the fourth section 58.

[0058] Due to the channel walls 34 to 38 and 50 explained above, the housing 12 is essentially divided into three sections on the inside, namely a first cooling air channel 64, a receiving space 66 and a second cooling air channel 68.

[0059] The first cooling air duct extends from the housing opening 30 with a duct section 70 in the longitudinal direction 72 of the high-pressure cleaning device 10 and essentially over its entire length. The duct section 70 is bounded at the top by the outer wall 28 and at the bottom by sections 40 and 42 of the duct wall 38.

[0060] Adjoining the channel section 70 is an approximately vertically extending channel section 74, which is formed between the third section 44, the channel wall 34, the outer wall 28, and the fourth section 46. The channel section 74 extends to the lower edge of the recess 48.

[0061] The first cooling air duct 64 extends in the transverse direction 76 of the high-pressure cleaning device 10 over its entire width.

[0062] Cooling air can be supplied to the motor pump unit of the high-pressure cleaning device 10, which will be explained below, through the first cooling air duct 64.

[0063] In cross-section, the first cooling air duct 64 has an approximately L-shape, i.e., the cooling air duct 64 is angled. At the transition from duct section 70 to duct section 74, the cooling air is deflected by approximately 90°. The cooling air undergoes a further deflection of approximately 90° from the second duct section 74 as it passes through the recess 48 (see below).

[0064] On the inside, the first cooling air duct 64 is lined in sections with a sound-absorbing material 78. The sound-absorbing material 78, for example a foam material, is arranged, for example, on the inside of the outer wall 28, at least above the second section 42, and extends to the duct wall 34. Sound-absorbing material 78 can also run on the inside of the duct wall 34 and the outer wall up to the fourth section 46. Advantageously, sound-absorbing material 78 is also arranged on the second section 42.

[0065] The second cooling air duct 68 extends from the recess 62 with a duct section 80 approximately vertically in the direction of the underside 18. The duct section 80 is bounded by the section 40, the sections 56 and 58 of the duct wall 50, the outer wall 28 and the duct wall 36.

[0066] At the bottom 18, the channel section 80 merges into a channel section 82, which extends from the channel wall 36 to the rear side 24. The channel section 82 thus extends in the longitudinal direction 72 almost over the entire length of the high-pressure cleaning device 10. The channel section 82 is bounded at the top by the sections 54 and 52 and at the bottom by the outer wall 28.

[0067] In the transverse direction 76, the cooling air duct 68 also extends over the entire width of the high-pressure cleaning device 10.

[0068] The second cooling air duct 68 also has an L-shaped cross-section with a bend between the duct sections 80, 82. As it flows through the second cooling air duct 68, the cooling air is deflected by approximately 90° shortly after the recess 62. A further deflection of approximately 90° occurs in the area of ​​the bend between the duct sections 80 and 82.

[0069] The second cooling air duct 68 is also lined in sections with sound-absorbing material 78. Sound-absorbing material 78 is arranged, for example, on the inside of the outer wall 28, in particular opposite the second section 54, on which sound-absorbing material 78 is preferably also arranged. Sound-absorbing material 78 is also advantageously arranged along the duct wall 38 and the outer wall 28 up to the first section 40.

[0070] The receiving space 66 is formed between the channel walls 38 and 50. The housing 12 comprises housing walls 84 and 86 in the receiving space 66. Each housing wall 84, 86 is oriented transversely to the longitudinal direction 72 and is double-walled with wall sections 88 and 90. Webs 92 connect the wall sections 88 and 90. A recess 94 is provided on each housing wall 84, 86.

[0071] The housing walls 84, 86 are spaced apart from each other in the longitudinal direction 72. The housing wall 84 is arranged approximately in the region of the rear end of the carrying handle 26, and the housing wall 86 is arranged approximately in the region of the front end of the carrying handle 26. However, this arrangement could also be different.

[0072] In the longitudinal direction 72, from back to front, there follows first the third section 44, at a distance therefrom the housing wall 84, at a distance therefrom the housing wall 86 and at a distance therefrom the fourth section 58.

[0073] The housing walls 84, 86 are, in a sense, partition walls which divide the receiving space 66 in the longitudinal direction 72 and are aligned in the transverse direction 76.

[0074] The high-pressure cleaning device 10 has a motor pump unit 96. The motor pump unit 96 comprises a motor 98 with a shaft 100 that defines an axis 102. In this case, the motor pump unit 96 is arranged on the high-pressure cleaning device 10 such that the axis 102 runs in the longitudinal direction 72, i.e., the longitudinal direction 72 is an axial direction. The axis 102 is oriented horizontally, i.e., it runs parallel to the contact plane defined by the high-pressure cleaning device 10.

[0075] The motor pump unit 96 further comprises a high-pressure pump 104, which is designed as an axial piston pump. The high-pressure pump 104 comprises a pump head 106, on which a pump inlet line 108 and a pump outlet line 110 are arranged.

[0076] A fan wheel 112 is held non-rotatably on the shaft 100.

[0077] The motor pump unit 96 is accommodated in the housing 12 in such a way that, starting from the rear side 24, first the fan wheel 112 follows, then the motor 98 and then the high-pressure pump 104 with the lines 108, 110 extending from it.

[0078] The high-pressure cleaning device 10 has an air guide part 114. The air guide part 114 has a substantially cylindrical shape and is aligned concentrically with the motor pump unit 96. The air guide part 114 surrounds the motor pump unit 96 on all sides in the circumferential direction of the axis 102 and extends from its end facing the rear side 24 to the pump head 106.

[0079] At one end section, namely at the end face 116 facing the rear side 24, an opening 118 is formed in the air guide part 114. The opening 118 is aligned with the recess 48, which, in combination with the corresponding recess on the housing half-shell 14, forms an outlet opening for the first cooling air duct 64. A sealing element 120 in the form of a ring is arranged at the edge of the opening 118.

[0080] Correspondingly, an opening 124 is formed in the air guide part 114 at an end section, namely the end face 122, facing the front side 22. The opening 124 is aligned with the recess 62, which, in combination with the corresponding recess on the housing half-shell 16, forms an inlet opening into the second cooling air duct 68. A sealing element 126 is arranged at the edge of the opening 124, in particular in the form of a ring, partial ring, or ring segment. In the present case, the sealing element 126 is not a ring segment. Further sealing at the edge of the opening 124 is achieved by a sealing element (not shown) arranged on an electrical switching element 127.

[0081] The sealing element 120 ensures a tight flow connection between the first cooling air duct 64 and the air guide part 114, and the sealing element 126 and the further sealing element (not shown) ensure a tight flow connection between the air guide part 114 and the second cooling air duct 68.

[0082] The high-pressure cleaning device 10 further comprises damping elements 128, via which the air guide part 114 is supported on the housing 12.

[0083] The damping elements 128 are made, for example, of a vibration-absorbing elastic rubber material or plastic material and serve to absorb vibrations between the air guide part 114 due to the operation of the motor pump unit 96 and the housing 12.

[0084] The damping elements 128 are in the present case annular and in particular as ring segments 130. Each damping element 128 extends over an arc of almost 180° in the circumferential direction of the axis 102 ( Figure 3 ), for example, from approximately 150° to approximately 170°. Two damping elements 128 are assigned to each housing wall 84 and each housing wall 86 (including the corresponding housing walls of the respective other housing half-shell 14).

[0085] The damping elements 128 surround the air guide part 114 in the circumferential direction of the axis 102 and transversely thereto.

[0086] A respective damping element 128 is held on the housing wall 84, being inserted in the region of the recess 94 in the axial direction between the wall sections 88 and 90 thereof. In the radial direction, the damping element 128 can be supported on the webs 92 of the housing wall 84. The same applies to a further damping element 128, which can be supported in the region of the recess 94 on the wall sections 88 and 90 and the webs 92 of the further housing wall 86.

[0087] In this way, it is possible for the air guide part 114 to be supported on the housing 12, namely its housing walls 84, 86, via the damping elements 128. Fixation is possible both in the axial direction and in the radial direction.

[0088] The high-pressure cleaning device 10 is characterized by particularly quiet operation. This is achieved by providing at least one cooling air duct 64, 68, as well as by providing damping elements 128, which allow the air guide part 114 to be supported on the housing 12.

[0089] During operation of the high-pressure cleaning device 10, cooling air is drawn in from the atmosphere through the housing opening 30. The cooling air flows through the first cooling air duct 64, is deflected twice, and enters the air guide part 114 via the opening 118. In the air guide part 114, the motor pump unit 96 is effectively cooled by the cooling air.

[0090] The cooling air then exits the air guide part 114 through opening 124 and is redirected twice as it flows through the second cooling air duct 68 to the housing opening 32 and through it into the atmosphere. Arrows 132 symbolize the flow direction of the cooling air.

[0091] As a result, the cooling air in the high-pressure cleaning device 10 flows along a rectangular meander through the cooling air duct 64, the air guide part 114, and the cooling air duct 68. The multiple deflections of the cooling air allow the noise emissions caused by the air flow to be kept to a minimum. The provision of the sound-absorbing material 78 in the cooling air ducts 64 and 68 is also particularly advantageous. Their slot-like design along the top side 20 and the bottom side 18 further ensures even quieter operation of the high-pressure cleaning device 10.

[0092] Noises generated by the cooling air flow in the air guide part 114 can be dampened by the air guide part 114 itself. Any vibrations of the air guide part 114 caused by the air flow, but especially also by structure-borne noise due to the operation of the motor pump unit 96, can be effectively absorbed by the damping elements 128. The vibrations on the housing 12 are significantly reduced, resulting in a particularly quiet high-pressure cleaning device 10.

[0093] The pump inlet line 108 and the pump outlet line 110 pass through the channel section 80, the sound-absorbing material 78, and the outer wall 28 at the front 22. The lines 108, 110 are spaced from the edges of the openings in the outer wall 28 through which they pass. Therefore, no vibration is transmitted to the housing 12 via the lines 108, 110.

[0094] At the same time, the high-pressure cleaning device 10 has a particularly compact design due to the angled cooling air ducts 64, 68. This makes the high-pressure cleaning device 10 easy to transport.

[0095] It is further advantageous that the housing openings 30, 32 are arranged on opposite sides of the housing 12. This largely prevents the intake of heated cooling air, which enters the atmosphere through the housing opening 32, and then immediately recirculates through the housing opening 30 into the cooling air duct 64.

[0096] Furthermore, it is advantageous that the housing opening 30 is located at the top of the high-pressure cleaning device 10. This reduces the likelihood of foreign objects such as dirt being sucked into the housing. List of reference symbols:

[0097] 10High-pressure cleaner 12Housing 14Housing half-shell 16Housing half-shell 18Bottom 20Top 22Front 24Rear 26Carrying handle 28Outer wall 30Housing opening 32Housing opening 34Duct wall 36Duct wall 38Duct wall 40First section 42Second section 44Third section 46Fourth section 48Recess 50Duct wall 52First section 54Second section 56Third section 58Fourth section 60Step 62Recess 64First cooling air duct 66Receiving space 68Second cooling air duct 70Duct section 72Longitudinal direction 74Duct section 76Transverse direction 78Sound-absorbing material 80Duct section 82Duct section 84Housing wall 86 Housing wall 88 Wall section 90 Wall section 92 Web 94 Recess 96 Motor pump unit 98 Motor 100 Shaft 102 Axle 104 High-pressure pump 106 Pump head 108 Pump inlet line 110 Pump outlet line 112 Fan wheel 114 Air guide part 116 Front end 118 Opening 120 Sealing element 122 Front end 124 Opening 126 Sealing element 127 Switching element 128 Damping element130Ring segment 132Arrows flow direction

Claims

1. An air-cooled high pressure cleaning device, comprising a housing (12) and a motor pump unit (96) received therein having a motor (98) and a high pressure pump (104) driven by said motor (98), as well as at least one cooling air channel (64, 68) for cooling air, arranged or formed in the housing (12), for cooling the motor pump unit (96), said cooling air channel (64, 68) being fluidically connected to the atmosphere by at least one housing opening (30, 32), wherein the high pressure cleaning device comprises an air guiding part (114) which is fluidically connected to the at least one cooling air channel (64, 68) and at least partially surrounds the motor pump unit (96), and damping elements (128), by means of which the air guiding part (114) is supported on the housing (12), wherein the at least one cooling air channel (64, 68) is formed, at least in sections, between an outer wall (28) of the housing (12) and at least one further channel wall (34, 36, 38, 50) comprised or formed by the housing (12) at a distance from the outer wall (28), wherein the high pressure cleaning device (10) has a first cooling air channel (64), through which cooling air out of the atmosphere is suppliable to the motor pump unit (96), and a second cooling air channel (68), through which cooling air is removable from the motor pump unit (96) into the atmosphere, and wherein the motor pump unit (96) and the air guiding part (114) are arranged between channel sections (70, 82) of the first and the second cooling air channel (64, 68) which run parallel to the motor pump unit (96), wherein the cooling air flows along a meander through the first cooling air channel (64), the air guiding part (114), and the second cooling air channel (68).

2. The high pressure cleaning device in accordance with Claim 1, characterized in that the air guiding part (114) is free of direct contact with the housing (12) and / or walls of the at least one cooling air channel (64, 68).

3. The high pressure cleaning device in accordance with Claim 1 or Claim 2, characterized in that the air guiding part (114) extends over the entire or substantially entire length of the motor pump unit (96) and / or in that the air guiding part (114) surrounds the motor pump unit (96) in the form of a shell and has on at least one end side, in particular an end face (116, 122), an opening (118, 124) via which the at least one cooling air channel (64, 68) and the air guiding part (114) open into each other.

4. The high pressure cleaning device in accordance with Claim 3, characterized in that at least one of the following applies: - a sealing element (120, 126) is arranged on the rim of the at least one opening (118, 124), in order to provide a sealed fluidic connection between the at least one cooling air channel (64, 68) and the air guiding part (114); - the motor pump unit (96) has a fan wheel (112) driven by a shaft (100) of the motor (98), said fan wheel (112) being arranged at an opening (118) of the air guiding part (114) and conveying cooling air over the motor pump unit (96); - a pump input conduit (108) and / or a pump output conduit (110) are fed out of the air guiding part (114) through an end-side opening (124) thereof, or a pump head (106) of the high pressure pump (104) passes through the opening (124).

5. The high pressure cleaning device in accordance with any one of the preceding claims, characterized in that the housing (12) has or forms housing walls (84, 86), the damping elements (128) being positioned between the housing walls (84, 86) and the air guiding part (114) and for support on the housing walls (84, 86), and / or in that the housing walls (84, 86) are oriented transversely to an axial direction of the motor pump unit (96).

6. The high pressure cleaning device in accordance with any one of the preceding claims, characterized in that at least one of the following applies: - the damping elements (128) are configured annularly or in the shape of a ring segment and each at least partially surround the air guiding part (114), preferably in a plane transverse to an axial direction of the motor pump unit (96); - with respect to an axial direction of the motor pump unit (96), at least at two positions spaced apart from each other, in each case at least one damping element (128) is arranged for supporting the air guiding part (114) on the housing (12); - the damping elements (128) are made out of a rubber material or a plastics material.

7. The high pressure cleaning device in accordance with any one of the preceding claims, characterized in that the at least one cooling air channel (64, 68) with a channel section (70, 82) runs in a longitudinal direction (72) of the high pressure cleaning device (10) and extends in the transverse direction (76) of the high pressure cleaning device (10) over its entire or substantially entire width.

8. The high pressure cleaning device in accordance with any one of the preceding claims, characterized in that the at least one cooling air channel (64, 68) is lined on the interior, at least in sections, with a sound-absorbing material (78).

9. The high pressure cleaning device in accordance with any one of the preceding claims, characterized in that the at least one cooling air channel (64, 68) is configured in an angled manner and in that the cooling air flowing through the at least one cooling air channel (64, 68) undergoes at least a single redirection, preferably of about 90°.

10. The high pressure cleaning device in accordance with any one of the preceding claims, characterized in that the motor pump unit (96) is oriented in parallel to a channel section (70, 82) of the at least one cooling air channel (64, 68) and the cooling air flowing through the channel section (70, 82) and the air guiding part (114) twice undergoes a redirection of preferably about 90° in each case.

11. The high pressure cleaning device in accordance with any one of the preceding claims, characterized in that at least one of the following applies: - the cooling air flows along a right angle meander through the first cooling air channel (64), the air guiding part (114), and the second cooling air channel (68); - the channel section (70) of the first cooling air channel (64) is arranged above and the channel section (82) of the second cooling air channel (68) is arranged below the motor pump unit (96); - a housing opening (30), via which cooling air enters into the first cooling air channel (64), and a housing opening (32), via which cooling air exits out of the second cooling air channel (68), are arranged on the housing (12) on sides which are remote from each other; - a housing opening (30), via which cooling air enters into the first cooling air channel (64), is positioned above a housing opening (32), via which cooling air exits out of the second cooling air channel (68).

12. The high pressure cleaning device in accordance with any one of the preceding claims, characterized in that the motor pump unit (96) is oriented horizontally in the housing (12).

13. The high pressure cleaning device in accordance with any one of the preceding claims, characterized in that the housing (12) has two housing half-shells (14, 16), wherein the motor pump unit (96) with the air guiding part (114) surrounding it is positioned between the housing half-shells (14, 16) and is supported by means of the damping elements (128) on end faces of housing walls (84, 86) of a respective housing half-shell (14, 16), which are faced toward the respective other housing half-shell (14, 16).

14. The high pressure cleaning device in accordance with any one of the preceding claims, characterized in that the high pressure pump (104) is an axial piston pump.