Vacuum apparatus having channel piece

Abstract

The invention relates to a vacuum apparatus comprising: - a suction unit (50) for producing a suction flow, the suction unit (50) comprising a fan (60), which has a fan motor (62); - a fan holder (72) for holding the fan (60) and / or the fan motor (62); and - a guiding device (70) for process air, the guiding device (70) for process air comprising a channel piece (80) which has at least one channel (82) which is connected, on the exhaust air side, to the fan (60), the channel piece (80) sitting on the fan holder (72), and the channel piece (80) sitting on the fan (60) or the fan motor (62).

Description

[0001] The invention relates to a suction device comprising a suction unit device for generating a suction flow, wherein the suction unit device has a blower with a blower motor, a blower holder for holding the blower and / or the blower motor, and a guide device for process air.

[0002] US 2014 / 0026355 A1 discloses a wet / dry vacuum cleaner.

[0003] US 8,297,949 B1 discloses a suction device.

[0004] WO 2013 / 139833 A1 discloses a suction unit for a suction machine.

[0005] CH 440 589 discloses a vacuum cleaner with a spiral housing having a rear end wall inclined to a longitudinal central axis, wherein the spiral housing cross-section increases towards a pipe socket.

[0006] US 2007 / 0151072 A1 discloses a vacuum cleaner with a discharge air flow path.

[0007] DE 20 2018 105 372 U1 discloses a device for extracting exhaust air generated on a hob.

[0008] JP H10-252696 discloses a centrifugal compressor.

[0009] US 2009 / 0095360 A1 discloses a vacuum cleaner with a plurality of exhaust air outlets.

[0010] WO 2018 / 091068 A1 discloses a suction device suitable for sucking liquids.

[0011] US 6,158,083 A discloses a wet / dry vacuum cleaner with improved air flow performance and reduced operating noise.

[0012] The invention is based on the object of providing a suction device of the type mentioned above which can be manufactured in a simple manner and / or has an optimized fluid sealing structure.

[0013] This object is achieved according to the invention in the suction device mentioned at the outset in that the guide device for process air has a duct piece with at least one duct which is connected to the blower on the exhaust air side, that the duct piece is located on the blower holder, and that the duct piece is located on the blower or blower motor.

[0014] The duct piece can be designed multifunctionally: It initially forms a channel for discharging process air from the blower. Because it is located on both the blower mount and the blower or blower motor, it can be designed as a sealing device that creates a fluid-tight seal between the blower or blower motor and the blower mount. Furthermore, a fluid seal to the blower motor can be easily achieved. Furthermore, a sealing device can be integrated into the duct piece, which seals off a cooling air duct for the blower motor.

[0015] Furthermore, the duct system allows for floating mounting, particularly for the blower motor or blower. This can, for example, achieve vibration isolation and minimize noise.

[0016] The duct section provides optimized, low-resistance air flow, allowing energy-efficient suction operation.

[0017] The duct piece allows for easy assembly of the suction device. The duct piece can be easily positioned relative to the blower during production, and its multifunctional design keeps the number of required components to a minimum.

[0018] It is advantageous if the duct piece is formed in one piece and / or the duct piece is formed in one piece and / or the duct piece is a unit that can be handled as a whole, at least during the manufacture of the suction device, and / or the duct piece is made of an elastic material that has a fluid-tight function and / or enables floating mounting. This keeps the number of required components to a minimum.

[0019] In one embodiment, the duct piece has a first opening and a second opening, wherein the second opening is spaced axially from the first opening. This allows the duct piece to be easily fitted over the blower / blower motor. It can be easily positioned relative to the blower. A sealing function can be easily implemented. It is possible to implement the sealing function, for example, on circular surfaces. This results in simple manufacturing.

[0020] In particular, at least one of the following is provided for: the first opening and the second opening are aligned parallel to each other; the first opening and / or the second opening are oriented transversely and in particular perpendicularly to the axial direction; the first opening and / or the second opening are surrounded by a closed wall; the first opening and / or the second opening have a circular cross-section; the blower motor is positioned in the second opening; the blower motor is positioned in at least a partial region of the first opening.

[0021] This makes the duct section easy to manufacture. Furthermore, it can be easily manufactured during the production of the suction device.

[0022] In particular, it is provided that the blower motor is mounted in a floating manner on the blower holder via the duct piece and / or that the duct piece forms a sealing device for sealing the blower motor, in particular with respect to the blower holder and / or a cooling air guide device for the blower motor. This results in a multifunctional design. For example, a single duct piece can achieve both a floating mounting of the blower motor and a seal, in particular with respect to both the blower holder and the cooling air guide device.

[0023] In one embodiment, the duct piece has a first partial region that is supported on the fan holder, and wherein the fan motor is supported on the first partial region, and wherein, in particular, the first partial region is positioned between the fan motor and the fan holder in an axial direction. This allows a fluid seal to be achieved between the fan holder and the fan motor. Furthermore, a floating mounting of the fan motor or the fan holder can also be achieved.

[0024] It is advantageous if the first partial area surrounds a first opening of the duct piece, and in particular, the first partial area forms a wall that surrounds the first opening in a closed manner. The corresponding duct piece can be manufactured in a simple manner. Furthermore, the corresponding suction device can be manufactured in a simple manner.

[0025] For the same reason, it is advantageous if the first opening has a first area that forms, or at least partially forms, an inlet-side connection for process air from the air ducting device to the blower. This allows for a simple connection of the blower to the air ducting device via the duct section.

[0026] Furthermore, it is advantageous if the first opening has a second area where the fan motor is positioned. This allows for simple and optimized positioning between the fan motor and the duct section.

[0027] In particular, at least one of the following is then provided: the second region follows the first region in the axial direction; the second region has a larger cross-sectional area and in particular a larger diameter than the first region; the first partial region of the duct piece has, at the second region of the first opening, a first contact surface for the blower motor for axially supporting the blower motor; the first partial region has, at the second region of the first opening, a second contact surface for the blower motor for radially supporting the blower motor; the first contact surface and / or the second contact surface are annular and in particular circular; the first contact surface and the second contact surface merge continuously into one another.

[0028] This creates a multifunctional duct. The fan is connected to the air ducting system via the duct. A fluid-tight and floating mounting of the fan / fan motor relative to the fan mount can be achieved via the duct.

[0029] Preferably, a cooling air guide device is provided for the fan motor, wherein the duct piece forms a sealing device for the cooling air guide device. In this case, no separate sealing device for fluid sealing of the cooling air guide device needs to be provided in addition to the duct piece.

[0030] In one embodiment, a cover is arranged on the blower motor, with at least one channel for guiding cooling air for the blower motor arranged or formed between the cover and the blower motor. This allows the cooling air guiding device to be implemented in a simple manner.

[0031] In particular, at least one of the following is provided for: The duct piece is designed as a sealing device for fluid sealing between the hood and the blower motor; the duct piece comprises a second partial region which is arranged between a wall of the hood and a wall of the blower motor and forms a fluid seal; the duct piece is designed for floating mounting of the hood on the blower motor.

[0032] This allows for the provision of a multifunctional duct piece which also ensures a fluid seal for the cooling air duct system.

[0033] In particular, at least one of the following is provided for: the second partial region is axially spaced from a first partial region of the duct piece, which ensures a fluid seal and / or mounting of the blower motor on the blower holder; the at least one channel of the duct piece is formed between the first partial region and the second partial region; the second partial region is designed as a projecting web which is immersed in a groove on the blower motor; the web extends at least approximately in the axial direction; the web is annular and in particular circular; the second partial region surrounds a second opening of the duct piece; a partial region of the hood is positioned in the second opening.

[0034] In this way, a multifunctional duct piece can be provided and a fluid seal with respect to the cooling air duct device can be easily achieved.

[0035] In particular, it is provided that the duct section has a third sub-region, which forms a wall of the at least one duct. This allows the air guidance function of the duct section to be achieved in a simple manner.

[0036] In particular, the third sub-region is arranged between a first sub-region of the duct piece and a second sub-region of the duct piece, wherein the first sub-region provides a fluid seal and / or mounting on the fan holder, and the second sub-region provides a fluid seal and / or mounting for a hood. This allows for a simple implementation of a multifunctional duct piece.

[0037] It is advantageous if the blower motor forms a further wall of the at least one channel of the duct piece. The at least one channel can thus be closed via the blower motor and, in particular, a housing of the blower motor. This keeps the number of parts to a minimum and results in simple assembly. In particular, the duct piece can be easily slipped over the blower / blower motor, for example.

[0038] In one embodiment, a receptacle, in particular a ring receptacle, is formed on an inner side of the duct piece between the second partial area and the third partial area. This allows a corresponding counter element of the blower / blower motor to be positioned on the receptacle to ensure secure fixation of the duct piece.

[0039] In particular, a recess such as a groove or a shoulder is formed on the inside of the duct piece, with a wall of the blower motor being arranged on the recess. This allows for a secure fixation between the duct piece and the blower motor or blower.

[0040] It is advantageous to provide a fan motor mount, which has at least one mount for the duct piece. This allows for easy axial and radial fixation of the fan / fan motor to a suction head of the vacuum cleaner. For example, it is also possible to clamp the fan or fan motor in the suction head, whereby the number of screws for fixing the fan / fan motor to the fan mount can be kept to a minimum, or even no screws are required.

[0041] In one embodiment, a first receptacle for a web of the channel piece is provided with at least one of the following: the at least one web is arranged on an upper side of the duct piece, which in particular faces away from the fan holder; the at least one web is arranged on a second partial region of the duct piece, which ensures a seal with a hood; the at least one web extends in the axial direction; when the at least one web is immersed in the receptacle, radial displaceability of the duct piece relative to the fan motor is blocked.

[0042] This allows for further fixation and, in particular, rotational locking of the combination of duct piece and blower / blower motor.

[0043] For the same reason, it is advisable to provide a second shot that includes a paragraph with at least one of the following: The duct piece has a shoulder for adaptation to the second receptacle; the shoulder of the duct piece is formed in a first partial area, which provides sealing and / or mounting on the fan holder; the second receptacle blocks radial and / or axial displacement of the fan motor or the fan.

[0044] This makes it easy to attach the blower / blower motor to the vacuum cleaner.

[0045] In particular, a third receptacle is provided, which blocks radial displacement and, in particular, also ensures radial compression of the channel piece. This allows an axial sealing device with radial compression to be achieved via the channel piece.

[0046] It is particularly advantageous if the duct piece forms a first axial sealing device and a second axial sealing device, which is spaced apart from the first sealing device, and at least one of the sealing devices is radially compressed. The first axial sealing device serves in particular for fluid sealing between a fan holder and the fan / fan motor. The second axial sealing device serves in particular for sealing a cooling air guide device for the fan motor. The duct piece is therefore multifunctional.

[0047] In one embodiment, the duct piece has at least one tab, and a counter element for the at least one tab is assigned to the fan holder. When the tab is fixed to the counter element, the rotational mobility of the duct piece relative to the fan holder is blocked. This allows for easy manufacture of the suction device. Furthermore, this predetermines a precise position for the duct piece during manufacture of the suction device.

[0048] In a structurally simple embodiment, the duct piece has at least one tab, and the counter element is a pin for inserting the duct piece through the opening. This allows for easy positioning of the duct piece relative to the fan holder during the manufacture of the suction device.

[0049] It is advantageous if the blower motor / blower is mounted axially. This results in a simple and space-saving design of the suction device.

[0050] The at least one channel of the duct section has an outlet that leads directly via a pipe element into an outlet for discharging process air exhaust to the surroundings of the suction device. This results in an optimized and, in particular, low-resistance flow path for process air exhaust.

[0051] It is advantageous if the outlet of at least one duct has a circular cross-section. This results in low-resistance air flow.

[0052] Advantageously, at least one duct is routed around the blower motor. This results in optimized flow guidance for process air.

[0053] In particular, the at least one channel has a path that runs around an axis that is parallel or coaxial to a motor axis. The path around an axis means that the path can be mathematically represented in polar coordinates with the motor axis as the pole and a corresponding polar angle.

[0054] In particular, the at least one channel has a spiral path, i.e., the at least one channel is designed as a volute. This results in optimized flow guidance.

[0055] In one embodiment, a suction head and a suction container are provided, with the suction head being detachably mounted on the suction container. This allows the suction container to be easily cleaned and emptied when the suction head is removed.

[0056] In particular, the blower motor (and the blower) is arranged on the suction head.

[0057] In one embodiment, the vacuum cleaner has a vertical axis, with a motor axis oriented at an acute angle to the vertical axis. This results in optimized space utilization.

[0058] The vacuum cleaner can be designed as a stand-alone unit, particularly as a wet / dry vacuum cleaner. The multifunctional duct piece also allows for a fluid seal around the blower motor. It is also possible for the vacuum cleaner to be integrated into a vehicle, for example.

[0059] The following description of preferred embodiments, taken in conjunction with the drawings, serves to further explain the invention. They show: Figure 1 is a schematic sectional view of an embodiment of a suction device according to the invention; Figure 2 is a sectional view along the line 2-2 according to Figure 1 ; Figure 3 an enlarged view of area A according to Figure 1; Figure 4 a sectional view along the line 4-4 according to Figure 3 ; Figure 5 a sectional view along the line 5-5 according to Figure 3 ; Figure 6 a sectional view along the line 6-6 according to Figure 3 ; Figure 7 a sectional view along the line 7-7 according to Figure 3 ; Figure 8 an enlarged view of area B according to Figure 3 ; Figure 9 an enlarged view of area C according to Figure 3 ; Figure 10 shows an embodiment of a channel section in plan view; Figure 11 shows a sectional view along the line 11-11 according to Figure 10 ; Figure 12 a perspective view of the channel section according to Figure 10 ; Figure 13 a further sectional view of the suction device according to Figure 1 ; Figure 14 an enlarged view of the area D according to Figure 13 ; Figure 15 a sectional view along the line 15-15 according to Figure 13 ; Figure 16 an enlarged view of the area E according to Figure 15 ; Figure 17 a similar representation as in Figure 16in a variant; and Figure 18 schematically shows a measuring device for determining a liquid level.

[0060] An embodiment of a vacuum cleaner according to the invention, shown in the figures and designated by 20, is designed as a stand-alone vacuum cleaner. The vacuum cleaner 20 is designed, in particular, as a wet / dry vacuum cleaner capable of sucking up liquids and dust.

[0061] The suction device 20 comprises a suction container 22. The suction container 22 has a base 24 and a wall 26. The wall 26 and the base 24 define an interior space 28. The interior space 28 can accommodate suction material. It is also possible for a suction bag to be positioned in the interior space 28 (for dry vacuuming operation).

[0062] In one embodiment, the suction material container 22 and thus the suction device 20 are designed to be mobile. A wheel device 30 is arranged on the suction material container 22. A wheel axle 32 is in Figure 1oriented transversely to the drawing plane.

[0063] A steerable roller 34 is positioned on the suction material container 22 at a distance from the wheel device 30, or several steerable rollers 34 are positioned.

[0064] A suction head 36 is located on the suction material container 22. The suction head 36 is removable from the suction material container 22 to allow access to the interior 28, in particular to be able to empty and clean the interior 28.

[0065] A fixing device 38 is provided, by means of which the suction head 36 can be fixed to the suction material container 22.

[0066] The suction device 20 has a vertical axis 40 extending from the suction material container 22 to the suction head 36. The vertical axis 40 is transverse and, in particular, perpendicular to the wheel axis 32.

[0067] If the suction device 20 is placed on a flat base 42, then this height axis is perpendicular to this base 42.

[0068] A suction port 44 is assigned to the suction material container 22. In one embodiment, the suction port 44 is positioned on the suction head 36.

[0069] A suction hose 46 can be connected to the suction connection 44.

[0070] From the suction connection 44, a pipe element 46, which is in particular curved, leads into the interior space 28. The pipe element 46 has a nozzle 48 which projects into the interior space 28.

[0071] It is also possible that the suction connection 44 is arranged directly on the suction material container 22.

[0072] If a suction bag is used, a corresponding opening connection of the suction bag can be pushed onto the nozzle 48.

[0073] The suction device 20 comprises a suction unit 50 for generating a suction flow. This suction flow acts on the interior 28 of the suction material container 22. Suction can be achieved via this suction flow. The suction flow is present at the suction connection 44. Figure 1 it is indicated by a double arrow.

[0074] The suction device 20 has a filter device 52. The filter device 52 is removably arranged, for example, on the suction head 36.

[0075] The filter device 52 has a clean side 54 and a dirty side 56. The dirty side 56 faces the interior 28 of the suction material container 22.

[0076] The suction flow flows through the filter device 52 and is cleaned by the filter device 52. Starting from the clean side 54 of the filter device 52, the suction flow is not contaminated.

[0077] A cleaning device 58 for the filter device 52 is arranged on the suction head 36. This allows the filter device 52 to be cleaned. For example, the cleaning device 58 generates air blasts that cause dirt particles adhering to the filter device 52 to fall into the interior 28 of the suction material container 22.

[0078] The suction unit device 50 comprises a blower 60 with a blower motor 62. The blower 60 has an impeller 64 which is driven in rotation by the blower motor 62.

[0079] The blower motor 62 has a motor axis 66 which is coaxial with a rotation axis for the impeller 64.

[0080] In one embodiment, the motor axis 66 is oriented at an acute angle 68 to the height axis 40.

[0081] The acute angle 68 is approximately 65° in one embodiment.

[0082] In principle, it is also possible that the motor axis 66 is oriented parallel to the height axis 40, for example.

[0083] The suction device 20 has a process air guide device, designated as a whole by 70. This process air guide device 70 is arranged on the suction head 36. Process air is guided to the suction head 36 via this guide device and discharged as process air exhaust air. This guided process air is air purified by the filter device 52. During wet operation of the suction device 20, it can generally be contaminated with liquid.

[0084] A fan holder 72 is arranged on the suction head 36. This fan holder 72 forms a base plate for securing the fan motor 62.

[0085] In one embodiment, the blower motor 62 is integrated into the blower 60; the blower motor 62 and the blower 60 in particular have a common housing 74 in which motor elements such as the stator and rotor are arranged, and in which the impeller 64 is arranged.

[0086] In this sense, the blower holder 72 then holds the blower 60 with the blower motor 62.

[0087] A receptacle 76 for the blower 60 / the blower motor 62 is arranged or formed on the suction head 36.

[0088] The guide device 70 for process air has one or more channels 78 which lead from the clean side 54 of the filter device 52 to the blower 60.

[0089] A duct piece 80 is arranged on the fan holder 72 and the fan 60 / fan motor 62. This duct piece 80 has a duct 82, which is connected to the exhaust air side of the fan. Process air exhaust can be discharged to the environment of the suction device 20 via this duct 82. Furthermore, the duct piece 80 is arranged and designed such that it is positioned on the inlet side with respect to the fan 60. This will be explained in more detail below.

[0090] The duct piece 80 is formed in one piece or in one part. It is particularly designed such that it is a unit that can be handled as a whole during the manufacture of the suction device 20 and, in particular, can be fixed as a whole to the suction head 36. One function of the duct piece 80 is to provide the duct 82 of the guide device 70 for process air for discharging exhaust air. The duct piece 80 also has a sealing function and a bearing function. The material for the duct piece 80 is selected accordingly. In particular, the duct piece is made of a single material.

[0091] In one embodiment, the channel piece is made of a vulcanized rubber material such as EPDM (ethylene propylene diene rubber).

[0092] In another embodiment, the channel piece 80 is made of a thermoplastic elastomer (TPE).

[0093] The duct piece 80 is arranged on the fan holder 72. It is also arranged on the fan 60 / the fan motor 62. Furthermore, a cover 84, which is associated with the fan motor 62, is arranged on the duct piece 80.

[0094] The channel section 80 has a path region 86, along which the channel 82 is formed. This path region 86 has a wall 88 that delimits the channel 82 to the outside, away from the blower 60 / the blower motor 62. The channel section 80 is open opposite the wall 88. A further wall 90 for closing the channel 82 is formed by the blower 60 / the blower motor 62 and thereby by the housing 74.

[0095] The path region 86 has a path around an axis that is coaxial with the motor axis 66. This means that a corresponding path of the path region 86 can be represented by polar coordinates, with the motor axis 66 forming the pole. The corresponding path can be represented by the distance from the pole (from the motor axis 66) and a polar angle.

[0096] For example, the track in track area 86 is circular.

[0097] In one embodiment (compare for example the Figure 6 ), the path of the wall 88, for example, is spiral-shaped. The underlying spiral is, for example, an Archimedean spiral or a logarithmic spiral. The path region 86 is then designed, in particular, as a volute.

[0098] In particular, it is provided that a diameter 92 of the channel 82 (compare Figure 6) continuously widens towards an exit 94 of the channel section 80.

[0099] In particular, the channel 82 is circular in cross-section and the outlet 94 has a circular cross-section (see, for example, also Figure 12 ).

[0100] The channel section 80 has (compare the Figures 10 to 12 ) a first opening 96 and a second opening 100 spaced apart in the axial direction 98. The axial direction 98 is coaxial with the motor axis 66.

[0101] The first opening 96 and the second opening 100 are parallel to each other. They are oriented transversely and, in particular, perpendicularly to the axial direction 98.

[0102] The first opening 96 and the second opening 100 are each bounded on the outside by the wall 88. The duct section 80 is open on the inside. This allows for easy connection to the blower 60.

[0103] The channel piece 80 has a first portion 102. The first portion 102 surrounds the first opening 96 and forms a wall for the first opening 96.

[0104] The channel piece 80 further has a second partial region 104. The second partial region 104 surrounds the second opening 100 and forms a wall for the second opening 100.

[0105] A third portion 106 of the channel section 80 is arranged between the first portion 102 and the second portion 104. This third portion 106 forms the wall 88 as the outer wall for the channel 82.

[0106] The first sub-area 102 is supported by a first side 108 (compare for example the Figures 8 , 9) on the fan holder 72. The fan 60 / fan motor 62 is supported on a second side 110 of the first sub-region 102, opposite the first side 108. The first sub-region 102 is thus positioned between the fan 60 / fan motor 62 and the fan holder 72.

[0107] The duct piece 80 forms a first sealing device over the first partial area 102. This seals the blower motor 62 / the blower 60 from the duct 82.

[0108] The first opening 96, which is formed by the first partial region 102, is designed as a connection or receives a connection via which the channel 82 is connected to the blower 60 on the inlet side with respect to process air.

[0109] The first portion 102 of the duct piece 80 also provides a floating mounting of the blower 60 / the blower motor 62 on the blower holder 72.

[0110] The first opening 96 has a first area 112, which provides for the connection of the channel 82 to the blower 60.

[0111] The first opening 96 further has a second region 114, on which the second side 110 lies, and which adjoins the first region 112 in the axial direction 98.

[0112] The second region 114 has a larger diameter than the first region 112.

[0113] A support surface 116 is formed on the second side 110, against which the blower 60 / the blower motor 62 is supported. The support surface 116 has a first contact surface 118 and a second surface 120. The first contact surface 118 serves to axially support the blower 60 / the blower motor 62 with respect to the axial direction 98. The second contact surface 120 also serves to radially support the blower 60 / the blower motor 62 in a radial direction transverse to the axial direction 98. The first contact surface 118 and the second contact surface 120 merge continuously into one another. The corresponding support surface, which is formed by the first contact surface 118 and the second contact surface 120, is annular.

[0114] The blower 60 / blower motor 62 is positioned and held at the second area 114.

[0115] The blower 60 / the blower motor 62 with the hood 84 is positioned in the first opening 96.

[0116] On its outer side, the first partial area 102 has a shoulder 122.

[0117] The receptacle 76 in the suction head 36 has a (counter) shoulder 124 adapted to the shoulder 22, against which the shoulder 122 of the channel piece 80 rests.

[0118] This blocks axial and radial displacement of the channel piece 80 relative to the suction head 36.

[0119] The counter-step 124 forms a second receptacle for the channel piece 80 on the suction head 36.

[0120] The second partial region 104 has a first web 126 which extends substantially parallel to the axial direction 98 and points in the direction of the second partial region 104.

[0121] The housing 74 has a groove 128. The first web 126 is immersed in this annular groove 128.

[0122] On an inner side 129 of the channel piece 80, a receptacle 130, which is, for example, a groove, is formed on the channel piece 80. This receptacle 130 is formed between the first partial region 102 and the third partial region 106.

[0123] A wall region 132 of the housing 74 of the blower 60 / the blower motor 62 is immersed in this receptacle 130, this wall region 132 delimiting the groove 128.

[0124] A wall region 134 of the hood 84 is also immersed in the groove 128, wherein the first web 126 lies between the wall region 134 of the hood 84 and the wall region 132 of the blower 60 / the blower motor 62.

[0125] The first web 126 and in particular the second portion 104 forms a fluid seal between the hood 84 and the blower 60 / the blower motor 62.

[0126] It is also possible for the hood 84 to be mounted floatingly on the blower 60 / the blower motor 62 via the second portion 104 of the duct piece 80.

[0127] A second axial sealing device is formed by the channel piece 80 over the second partial area 104, which ensures an airtight seal between the hood 84 and the housing 74.

[0128] The hood 84 is dome-shaped. It has an opening 136, particularly coaxial with the motor axis 66 (see Figure 4 ).

[0129] A fan wheel 140 is arranged on a shaft 138 of the blower motor 62 and is associated with the opening 136. The fan wheel 140 is particularly spaced apart from the impeller 64. When the shaft 138 rotates, the fan wheel 140 rotates about the same axis of rotation as the impeller 64, i.e., an axis coaxial with the motor axis 66. Cooling air can thus be drawn in through the opening 136.

[0130] The opening 136 is in corresponding connection with a connection on the suction head 36, through which cooling air can be sucked in.

[0131] The hood 84 surrounds a portion of the blower motor 62. Between it and this portion, one or more channels 142 of an air cooling device for the blower motor 62 are formed.

[0132] Cooling air sucked in through the opening 136 can flow in the channel(s) 142 and thereby flow around a corresponding housing area 144 of the blower motor 62.

[0133] An outlet 146 is arranged on the hood 84, to which a pipe 148 is connected, which leads to an outlet 51 for cooling air on the suction head 36 (compare Figure 2 ; in Figure 2 the flow of cooling air is indicated by a double arrow in broken lines).

[0134] Furthermore, a second web 152 or several second webs 152 are arranged on the second partial area 104 (compare the Figures 8 , 10, 12 ).

[0135] These are located on an upper side of the channel piece 80 and point upwards away from the second partial area 104.

[0136] In particular, the second web(s) 152 are aligned at least approximately parallel to the axial direction 98.

[0137] The receptacle 76 on the suction head 36 is a first receptacle 154 (compare Figure 8 ) into which the second web(s) 152 are at least partially immersed.

[0138] On the second portion 104 of the channel piece 80, one or more tabs 156 (see Figure 10 ). A corresponding tab 156 has an opening 158 (see Figure 7 ). A counter element 160 is arranged on the suction head, associated with the blower holder 72. This counter element is designed, in particular, as a pin element that is immersed in the opening 158.

[0139] In one embodiment, two tabs 156 and correspondingly two counter elements 160 are provided.

[0140] During the manufacture of the suction device 20, the duct piece 80 can be positioned in a rotationally fixed manner relative to the blower holder 72 by fixing the tabs 156 to the corresponding counter elements 160 and thereby correctly aligned.

[0141] From the outlet 94 of the channel section 80, a pipe element 162 (compare Figure 6 ) to an outlet on the suction head 36, via which process air exhaust air can be released into the environment of the suction device 20.

[0142] It is also possible that the channel section 80 with its outlet 94 leads directly into the outlet.

[0143] The duct piece 80 is a multifunctional component, which is particularly realized in a one-piece component: It forms the duct 82 through which process air exhaust can be discharged from the blower 60.

[0144] A connection of the blower 60 to the duct 82 is formed at least partially via the first opening 96 of the duct piece 80.

[0145] The channel piece 80 forms a first sealing device over the first portion 102, via which the blower 60 / the blower motor 62 are sealed fluid-tight against the blower holder 72. Furthermore, the channel piece 80 ensures that no liquid-laden suction flow can reach the blower motor 62.

[0146] Furthermore, the blower 60 / blower motor 62 is mounted in a floating manner over the first section 102 of the duct section 80. This allows for a certain degree of vibration isolation and reduces noise generation.

[0147] The first sealing device is in particular an axial sealing device.

[0148] Furthermore, the duct piece 80 forms a second sealing device via the second partial area 104, via which the hood 84 is mounted in a fluid-tight manner on the fan 60 / the fan motor 62. This achieves fluid-tightness of the cooling air guide device for cooling the fan motor 62.

[0149] Furthermore, a certain degree of vibration decoupling of the hood 84 can be achieved.

[0150] The channel piece 80 is in particular radially pressed and positioned in the receptacle 76.

[0151] The blower 60 / the blower motor 62 is clamped axially, in particular. A corresponding mount 162 is provided, which ensures this axial clamping. The blower motor 62 / the blower 60 can thus be easily fixed in the suction head 36. The suction device 20 can be manufactured in a simple manner. This results in a space-saving arrangement with high fluid tightness.

[0152] The duct piece 80 is placed over the blower 60 with the blower motor 62.

[0153] The duct section 80 also allows for effective flow guidance with low flow resistance. This results in high efficiency for the operation of the suction device 20.

[0154] The suction device 20 can be manufactured simply and cost-effectively. The number of components can be minimized thanks to the multifunctional design of the duct section 80.

[0155] The suction device 20 comprises a measuring device 164 (in particular Figures 13 to 18) for determining a liquid level 166 in the suction material container 22. In particular, the measuring device 164 is designed as a threshold device, which checks whether a specific threshold value for a liquid level 166 has been reached; in a wet suction operation of the suction device 20, liquid is sucked in and collected in the suction material container 22. The aim is to prevent the suction device 20 from becoming "flooded." By determining the liquid level 166 and in particular a threshold value, the measuring device 164 can, for example, be used to shut down a suction operation in a timely manner.

[0156] The measuring device 164 comprises a probe device 168. The probe device 168 has a first flexurally elastic element 170 and a second flexurally elastic element 172. The first flexurally elastic element 170 and the second flexurally elastic element 172 are spaced apart from one another in a transverse direction 174, which is in particular parallel to the wheel axle 32.

[0157] In one embodiment, the probe device 168 is arranged on the suction head 36.

[0158] It is also possible in principle for the probe device 168 to be arranged on the suction material container 22, or for it to be arranged with a first part on the suction head 36 and with a second part on the suction material container 22.

[0159] The arrangement of the probe device 168 completely on the suction head 36 has the advantage that electrical components of the measuring device 164, which are arranged in the suction head 36, can be in firm electrical contact with the probe device 168. If the probe device 168 is arranged on the suction material container 22, then appropriate electrical contact must be ensured when the suction head 36 is placed on the suction material container 22.

[0160] The first flexurally elastic element 170 and the second flexurally elastic element 172 protrude into the interior 28 of the suction material container 22 in an operative position when the suction head 36 is placed on the suction material container 22.

[0161] In one embodiment (in particular Figures 15 and 16), the first flexurally elastic element 170 and the second flexurally elastic element 172 are each designed as a linear element 176. It is wire-shaped, rope-shaped, or thread-shaped and made of an electrical conductor.

[0162] The first flexurally elastic element 170 and the second flexurally elastic element 172 are each held on a holder 182 of the suction head 36 via a first fixing point 178 and a second fixing point 180.

[0163] Between the first fixing point 178 and the second fixing point 180, the respective flexible elastic element 170, 172 is freely suspended.

[0164] Relative to the height axis 40, the first fixing point 178 and the second fixing point 180 are at the same height, with the fixing points 178, 180 for both flexurally elastic elements 170, 172 being at the same height.

[0165] The first flexurally elastic element 170 and the second flexurally elastic element 172 have an arcuate shape between the respective first fixation point 178 and the second fixation point 180.

[0166] The first fixation point 178 is located in the region of a first end 184 of the respective flexible element 170, 172. The second fixation point 180 is located in the region of a second end 186.

[0167] In one embodiment, the corresponding flexurally elastic element 170 is fixed to the holder 162 by arranging a pin element 188 in the region of its ends 184, 186, which is fixed to the holder 162 and, for example, is pressed in there. The pin element 188 is, for example, pressed or glued to the linear element 176.

[0168] In a starting position (compare for example the Figures 13 , 16), the first flexurally elastic element 170 and the second flexurally elastic element 172 extend along the vertical axis 40 with a point or region 190 that has a minimal distance from the bottom 24 of the suction material container 22. This region 190 is, in particular, an apex point in the case of an arcuate configuration of the flexurally elastic elements 170, 172.

[0169] When the liquid level 166 reaches the range 190, a corresponding threshold value is reached. Range 190 thus defines the threshold value for the level detection of the measuring device 164.

[0170] The area 190 is located at the same height in the height axis 40, particularly for the first flexurally elastic element 170 and the second flexurally elastic element 172. (Due to the oblique cut in Figure 13 the areas 190 of the flexurally elastic elements 170, 172 appear offset there.)

[0171] The first fixation point 178 and the second fixation point 180 are spaced apart from each other in a direction 192 by a distance 194. The direction 192 is transverse to the transverse direction 174 and transverse to the height axis 40.

[0172] In one embodiment, the direction 192 is a longitudinal direction of the suction device 20. In particular, in one embodiment, the suction device 20 has a larger dimension in the direction 192 than in the transverse direction 174.

[0173] The distance 194 is in particular at least 2 cm, preferably at least 4 cm, preferably at least 6 cm, preferably at least 8 cm and in particular preferably at least 10 cm.

[0174] Preferably, the distance 194 is at least 12 cm or at least 14 cm or at least 16 cm.

[0175] In principle, the distance 194 can be selected to be as large as a hanging position of the flexible elements 170, 172 with protrusion into the interior 28 of the suction material container 22 is still possible.

[0176] In the Figures 1 and 15 a variant 196 is indicated in which the flexible elastic element has a greater length, i.e. the distance 194 is greater than in the embodiment according to Figure 13 .

[0177] The first flexurally elastic element 170 and the second flexurally elastic element 172 each have opposing envelope planes 198a, 198b spaced parallel apart. The line element 176 lies between these envelope planes 198a, 198b.

[0178] The first flexurally elastic element 170 and the second flexurally elastic element 172 are designed to be so rigid that they have a fixed position, namely the initial position, without any force influence. They are arranged and designed to be movable so that a deflection from this initial position is possible. This is shown in Figure 14 There, an initial position 200 is shown for the first flexurally elastic element 170 and 172. The double arrow 202 indicates a deflection relative to this initial position 200.

[0179] The flexurally elastic elements 170, 172 are arranged and configured such that, upon deflection from the initial position 200 and upon removal of the corresponding deflection force, they automatically return to their initial position 200. In particular, they are arranged and configured to be resilient such that they snap back into their initial position.

[0180] This reduces the risk of damage to the probe device 168. Furthermore, the snap-back action allows for a type of "automatic" cleaning of the flexible, elastic elements 170, 172.

[0181] When the liquid level 166 reaches the area 190, the flexible elements 170, 172 are generally exposed to contaminated liquid. This can cause dirt to settle on the flexible elements 170, 172.

[0182] If a flexurally elastic element 170, 172 is moved from the initial position 200 and snaps back via the resilient design after the deflection force is removed, then incrustations can detach from the flexurally elastic element 170, 172 (from the line element 176).

[0183] In one embodiment, the flexurally elastic elements 170, 172 are in the initial position 200 at an acute angle 204 (compare Figure 13) is inclined relative to the height axis 40, wherein a distance 206 between the first flexurally elastic element and the second flexurally elastic element 172 decreases towards the region 190.

[0184] At the Figure 14 In the arrangement shown, the distance 206 decreases towards the bottom 24 of the suction material container 22.

[0185] The acute angle 204 is in particular related to the envelope planes 198a, 198b.

[0186] This provides an insertion aid when the suction head 36 with the probe device 168 is placed on the suction material container 22.

[0187] In particular, this makes it possible for the first flexurally elastic element 170 and the second flexurally elastic element 172 to be positioned at a relatively large distance in the transverse direction 174 and in particular at the edge of the suction head 36.

[0188] It is advantageously provided that the first flexurally elastic element 170 and the second flexurally elastic element 172 are arranged at an equal distance in the direction 192. This equal distance in the direction 192 is not absolutely necessary for proper operation.

[0189] The suction head 36 has on its underside (which faces the bottom 24 of the suction material container 22 when the suction head 36 is placed on the suction material container 22) a mounting surface 208 (see Figure 1 ) with a corresponding installation surface. When the suction head 36 is removed from the suction material container 22, it can be placed on a base using this installation surface 208.

[0190] It is intended that the first flexible element 170 and the second flexible element 172, in their initial position 200, lie on the corresponding installation plane for the installation surface 208 or protrude beyond it. (In principle, they can also be set back from this.)

[0191] In particular, if the flexible elements 170, 172 protrude beyond the installation plane in their initial position 200, they are bent when the suction head 36 is placed on a base. When the suction head 26 is then raised, they snap back into their initial position 200. This creates the cleaning effect described.

[0192] By arranging the flexurally elastic elements 170, 172 at the acute angle 204 to the height axis 40, in particular, an inward bending occurs, i.e. the flexurally elastic elements 170, 172 are bent towards each other.

[0193] In a variant of an embodiment, which in Figure 15 As indicated by reference numeral 210, a corresponding flexurally elastic element is fixed to the suction head 22 such that corresponding fixing points 212, 214 are not at the same height relative to the vertical axis 40. For example, the first fixing point 212 is located in the region of an underside of the suction head 36, and the second fixing point 214 is located on the nozzle 48.

[0194] In a variant of an embodiment ( Figure 17 ) A flexible, elastic element 170 is fixed to a holder 216 of the suction head 36, with a receptacle 218 arranged on the holder, respectively associated with the first fixing point 178 and the second fixing point 180. The receptacle 218 has a first part 220, in which a screw is positioned. It has a second part 222, through which the flexible, elastic element 170 extends.

[0195] The flexible elastic element can be fixed and in particular clamped in the second part 222 via the screw in the first part 220.

[0196] The receptacle 218 has an 8-shape with respect to its openings.

[0197] The suction device 20 has a control device 224 ( Figure 18 ), which is arranged in particular in the suction head 36. The control device controls the blower motor 62. The control device 224 is connected to one or more switches.

[0198] The control device 224 controls an optical and / or acoustic display 226.

[0199] The measuring device 164 comprises an evaluation circuit 228. This is implemented, for example, in an ASIC.

[0200] For a measuring operation of the measuring device 164, a voltage VccProbe_enable is applied between the first flexible element 170 and the second flexible element 172 as a loading signal via the evaluation circuit 228. A falling voltage Voltage In is measured as a response signal.

[0201] A resistance R_probe exists between the first flexurally elastic element 170 and the second flexurally elastic element 172 due to the presence of a medium between them. If there is no fluid between the first flexurally elastic element 170 and the second flexurally elastic element 172, this resistance can be ideally considered infinite.

[0202] If fluid is present between the first flexible element 170 and the second flexible element 172, a current, particularly a short-circuit current, can flow. As a result, the resistance becomes finite, and the voltage Voltage In changes. This change is a measure that the fluid level 166 has reached the area 190. This allows the threshold value to be detected accordingly, and the fluid level 166 can be determined, at least digitally.

[0203] Corresponding measurement signals are provided by the evaluation circuit 228 and the control device 224. In one embodiment, the control device 224 then switches off the suction operation by appropriately applying pressure to the blower motor 62.

[0204] A warning may be issued. It is also possible, for example, that if the corresponding threshold is detected, the suction device 20 may not be able to be restarted for suction operation.

[0205] In particular, the VccProbe_enable signal, which is an actuation signal, is pulsed over time, so that a measurement is not performed continuously. The Voltage In signal is a corresponding response signal and contains, at least in digital form, the liquid level 166, i.e., whether the threshold value has been reached or not.

[0206] According to the invention, a probe device 168 is provided that is flexible. The flexible elements 170, 172 greatly reduce the risk of breakage. The probe device 168 occupies relatively little space in the suction container 22 due to the linear elements 176. A flexible design aids in the self-cleaning of the flexible elements 170, 172. This allows for easy breakage of incrustations.

[0207] The self-cleaning effect can also occur automatically when the suction head 36 is placed on the support surface 208.

[0208] The first flexible elements 170, 172 are each made of an electrical conductor. They are rope-shaped with a certain inherent rigidity, although they can also be designed to be flexible. They are made, for example, of a wire material or of a thread or fiber material with conductive fibers, such as carbon fibers.

[0209] In one embodiment, the flexible elements 170, 172 are arranged centrally on the suction device 20 with respect to the direction 192. In particular, they are arranged spaced apart from one another in the transverse direction 174. This allows for a simple and reliable determination of when a threshold value for the liquid level has been reached.

[0210] By a flexurally elastic design of the flexurally elastic elements 170, 172, a snapping back from the initial position 200 can be achieved for a self-cleaning effect.

[0211] By suspending them at spaced-apart fixing points 178, 180, air can flow through the flexible elements 170, 172. The suction air flow is not obstructed.

[0212] The probe device 168 can be arranged in such a way that, due to the acute angle 204, an insertion aid for placing the suction head 36 on the suction material container 22 is achieved. List of reference symbols

[0213] 20Suction unit 22Suction material container 24Floor 26Wall 28Interior 30Wheel device 32Wheel axle 34Rollers 36Suction head 38Fixing device 40Elevation axis 42Base 44Suction connection 46Pipe element 48Connector 50Suction unit device 52Filter device 54Clean side 56Dirty side 58Cleaning device 60Blower 62Blower motor 64Impeller 66Motor axle 68Acute angle 70Guide device for process air 72Blower holder 74Housing 76Receptacle 78Duct 80Duct section 82Duct 84Hood 86Track area 88Wall 90Wall 92Diameter 94Outlet 96First opening 98Axial direction 100Second opening 102First section 104Second section 106Third section 108First side 110Second side 112First section 114Second section 116Support surface 118First support surface 120Second support surface 122Step 124(Counter) step 126First web 128Groove 129Inside 130Receptacle 132Wall area 134Wall area 136Opening 138Shaft 140Fan wheel 142Channel 144Housing area 146Outlet 148Tube 150Outlet 152SecondWeb 154First receptacle 156Tab 158Opening 160Counter element 162Holder 164Measuring device 166Liquid level 168Probe device 170First flexible element 172Second flexible element 174Transverse direction 176Line element 178First fixation point 180Second fixation point 182Holder 184First end 186Second end 188Pin element 190Area 192Direction 194Distance 196Variant 198aEnvelope plane 198bEnvelope plane 200Starting position 202Double arrow 204Acute angle 206Distance 208Installation surface 210Variant 212First fixation point 214Second fixation point 216Holder 218Receptacle 220First part 222Second part 224Control device 226Display 228Evaluation circuit

Claims

1. Suction apparatus, comprising a suction unit device (50) for creating a suction flow, wherein the suction unit device (50) comprises a fan (60) having a fan motor (62), a fan holder (72) for holding the fan (60) and / or the fan motor (62), and a routing device (70) for process air, wherein the routing device (70) for process air comprises a conduit piece (80) having at least one conduit (82) which is connected to the fan (60) on the exhaust air side thereof, wherein the conduit piece (80) is located at the fan holder (72), characterized in that the conduit piece (80) is located at the fan (60) or the fan motor (62).

2. Suction apparatus in accordance with claim 1, characterized by at least one of the following: - the conduit piece (80) is of one-piece configuration; - the conduit piece (80) is of one-part configuration; - the conduit piece (80) is a unit which is handleable as a whole during at least the process of manufacturing the suction apparatus; - the conduit piece (80) is made of an elastic material that has a fluid sealing function and / or enables a floating support to be effected.

3. Suction apparatus in accordance with claim 1 or 2, characterized in that the conduit piece (80) comprises a first opening (96) and a second opening (100), wherein the second opening (100) is in spaced relation to the first opening (96) in an axial direction (98), and in particular characterized by at least one of the following: - the first opening (96) and the second opening (100) are oriented parallel to one another; - the first opening (96) and / or the second opening (100) is oriented transversely, and in particular perpendicularly, to the axial direction; - the first opening (96) and / or the second opening (100) is surrounded by a closed wall; - the first opening (96) and / or the second opening (100) has a circular cross-section; - the fan motor (62) is positioned in the second opening (100); - the fan motor (62) is positioned in at least a portion of the first opening (96).

4. Suction apparatus in accordance with any one of the preceding claims, <b>characterized by at least one of the following: - the fan motor (62) is floatingly supported on the fan holder (72) via the conduit piece (80); - the conduit piece (80) forms a sealing device for sealing the fan motor (62), in particular towards the fan holder (72) and / or a cooling air routing device for the fan motor; and in particular characterized by at least one of the following: - the conduit piece (80) comprises a first portion (102) which is supported on the fan holder (72), and wherein the fan motor (62) is supported on the first portion (102), and in particular wherein the first portion (102) is positioned between the fan motor (62) and the fan holder (72), relative to an axial direction (98); - the first portion (102) surrounds a first opening (96) of the conduit piece (80) and, in particular, the first portion (102) forms a wall which extends around the first opening (96) in a closed path, preferably wherein the first opening (96) comprises a first region (112) which forms or at least partially comprises an inlet-side connection for process air of the air routing device (70) for process air to the fan (60), and preferably wherein the first opening (96) comprises a second region (114) at which the fan motor (62) is positioned.

5. Suction apparatus in accordance with claim 4, <b>characterized by at least one of the following: - the second region (114) follows the first region (112) in an axial direction (98); - the second region (114) has a larger cross-sectional area and, in particular, a larger diameter than the first region (112); - the first portion (102) of the conduit piece (80) has, at the second region (114) of the first opening (96), a first contact surface (118) for the fan motor (62) for axially supporting the fan motor (62); - the first portion (102) has, at the second region (114) of the first opening (96), a second contact surface (120) for the fan motor (62) for radially supporting the fan motor (62); - the first contact surface (118) and / or the second contact surface (120) is configured in a ring shape, and a circular ring shape in particular; - the first contact surface (118) and the second contact surface (120) continuously pass one into the other.

6. Suction apparatus in accordance with any one of the preceding claims, characterized by a cooling air routing device for the fan motor (62), wherein the conduit piece (80) forms a sealing device for the cooling air routing device.

7. Suction apparatus in accordance with any one of the preceding claims, characterized in that a hood (84) is arranged at the fan motor (62), wherein at least one conduit for routing cooling air for the fan motor (62) is arranged or formed between the hood (84) and the fan motor (62), and in particular characterized by at least one of the following: - the conduit piece (80) is configured as a sealing device for fluid sealing between the hood (84) and the fan motor (62); - the conduit piece (80) comprises a second portion (104) which is arranged between a wall of the hood (84) and a wall of the fan motor (62) and forms a fluid seal therebetween; - the conduit piece (80) is configured for floating support of the hood (84) on the fan motor (62), preferably comprising at least one of the following: - the second portion (104) is in axially spaced relation to a first portion (102) of the conduit piece (80), which first portion (102) provides for fluid sealing to and / or support on the fan holder (72) for the fan motor (62); - the at least one conduit (82) of the conduit piece (80) is formed between the first portion (102) and the second portion (104); the second portion (104) is configured as a projecting web (126) which is entered in a groove (128) at the fan motor (62); - the web (126) extends at least approximately in an axial direction (98); - the web (126) is configured in a ring shape, and a circular ring shape in particular; - the second portion (104) surrounds a second opening (100) of the conduit piece (80); - a portion of the hood (84) is positioned in the second opening (100).

8. Suction apparatus in accordance with any one of the preceding claims, characterized in that the conduit piece (80) comprises a third portion (106) which forms a wall of the at least one conduit (82), and in particular characterized by at least one of the following: - the third portion (106) is arranged between a first portion (102) of the conduit piece (80) and a second portion (104) of the conduit piece (80), wherein the first portion (102) provides for fluid sealing to and / or support on the fan holder (72) and the second portion (194) provides for fluid sealing and / or support for a hood (84); - the fan motor (62) forms a further wall of the at least one conduit (82) of the conduit piece (80); - a receptacle (130) is formed on an inner side of the conduit piece (80), between the second portion (104) and the third portion (106), which receptacle (130) is in particular an annular receptacle.

9. Suction apparatus in accordance with any one of the preceding claims, characterized in that a receptacle (130) is formed on an inner side of the conduit piece (80), wherein a wall of the fan motor (62) is arranged at the receptacle (130).

10. Suction apparatus in accordance with any one of the preceding claims, characterized by a fan motor receptacle (76) at which at least one receptacle for the conduit piece (80) is formed, and in particular characterized by a first receptacle (154) for a web (152) of the conduit piece (80), comprising at least one of the following: - the at least one web (152) is arranged at an upper side of the conduit piece (80) which, in particular, faces away from the fan holder (72); - the at least one web (152) is arranged at a second portion (104) of the conduit piece (80) which provides for sealing to a hood (84); - the at least one web (152) extends in an axial direction (98); - radial displaceability of the conduit piece (80) relative to the fan motor (62) is blocked when the at least one web (152) is entered in the receptacle (154).

11. Suction apparatus in accordance with claim 10, <b>characterized by a second receptacle which comprises a step (124), and comprising at least one of the following: - the conduit piece (80) comprises a step (122) for conforming to the second receptacle; - the step (122) of the conduit piece (80) is formed at a first portion (102) which provides for sealing to and / or support on the fan holder (72); - the second receptacle blocks radial displaceability and / or axial displaceability of the fan motor (62); and preferably characterized by a third receptacle which blocks radial displaceability and, in particular, also provides for compression of the conduit piece (80) in a radial direction.

12. Suction apparatus in accordance with any one of the preceding claims, characterized in that the conduit piece (80) forms a first axial sealing device and forms a second axial sealing device which is in spaced relation to the first axial sealing device, and in that at least one of the sealing devices is placed in radial compression, and / or characterized in that the conduit piece (80) comprises at least one lug (156) and the fan holder (72) has associated therewith a counter element (160) for the at least one lug (156), wherein, when the lug (156) is in fixed relation to the counter element (160), the conduit piece (80) is blocked against rotational movement relative to the fan holder (72), and in particular characterized in that the at least one lug (156) comprises an opening (158) and the counter element (160) is a pin for passing through the opening.

13. Suction apparatus in accordance with any one of the preceding claims, characterized in that the fan motor (62) is axially clamped.

14. Suction apparatus in accordance with any one of the preceding claims, characterized in that the at least one conduit (82) of the conduit piece (80) comprises an outlet (94) which opens directly or via a tube element into an exit for discharging process air exhaust into a surrounding environment of the suction apparatus, and in particular characterized in that the outlet (94) of the at least one conduit (82) has a circular cross-section.

15. Suction apparatus in accordance with any one of the preceding claims, characterized by at least one of the following: - the at least one conduit (82) is routed around the fan motor (62); - the at least one conduit (82) has a path course that extends about an axis which is parallel or coaxial to a motor axis (66); - the at least one conduit (82) has a spiral-shaped path course.

16. Suction apparatus in accordance with any one of the preceding claims, characterized by a suction head (36) and a suctioned material container (22), wherein the suction head (36) is releasably arranged at the suctioned material container (22), and in particular characterized in that the fan motor (62) is arranged at the suction head (36).

17. Suction apparatus in accordance with any one of the preceding claims, characterized by a height axis (40), wherein a motor axis (46) is oriented at an acute angle (68) to the height axis (40).

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