Suction device having a washing valve

Abstract

The invention relates to a suction device, comprising a suction device housing (11), in which a suction turbine (14) for generating a suction flow (SM) is arranged, the suction device housing (11) has a suction inlet (12) for introducing a suction flow (SM) and a dust collection space (15) for collecting dust contained in the suction flow (SM) during a suction operation of the suction device (10), a filter element (25) for blocking dust in the dust collection space (15) being arranged between the dust collection space (15) and the suction turbine (14), wherein a purge valve (40, 140) is arranged between the filter element (25) and the suction turbine (14), the purge valve (40, 140) having a suction flow valve (43A) with a suction flow valve body (43) which closes the suction flow channel (17) in a purge position (AR) and releases the suction flow channel (17) in a suction operating position (SB), the cleaning valve (40, 140) has a suction flow channel (18) which runs between the suction turbine (14) and the filter element (25) and through which the suction flow (SM) can flow, and wherein the cleaning valve (40, 140) has an external air valve (63A, 73A) with an external air valve body (63) which closes the external air channel (18) in a suction operating position (SB) and releases the external air channel (18) in a cleaning position (AR), the external air channel runs between the filter element (25) and an external air inlet (19) provided for the inflow of external air, such that an external air flow (FLS) flowing in through the external air inlet (19) can flow through the filter element (25) in a flow direction opposite the suction flow (SM) in order to wash the filter element. According to the invention, the suction flow valve body (43) has at least one external air passage (55) through which at least part or all of the external air flow (FLS) can flow in a cleaning position (AR).

Description

Technical Field

[0001] The invention relates to a suction device comprising a suction device housing, in which a suction turbine for generating a suction flow is arranged, wherein the suction device housing comprises a suction inlet for admitting the suction flow and a dust collecting space for collecting dust contained in the suction flow during suction operation of the suction device, wherein a filter element for retaining dust in the dust collecting space is arranged between the dust collecting space and the suction turbine, wherein a cleaning valve is arranged between the filter element and the suction turbine, wherein the cleaning valve comprises a suction flow valve with a suction flow valve body, wherein the suction flow valve body is in a cleaning position The suction flow channel is closed and released in the suction operating position, the suction flow channel runs between the suction turbine and the filter element and can be flowed through by the suction flow, and the purge valve has an external air valve with an external air valve body, which closes the external air channel in the suction operating position and releases it in the purge position, the external air channel runs between the filter element and an external air inlet provided for allowing external air to flow in, so that the external air flow flowing in through the external air inlet can flow through the filter element in a flow direction opposite to the suction flow to clean the filter element. Background Art

[0002] Such a purge valve is described, for example, in DE 101 01 219 B4. That is, the purge valve has two valve bodies, wherein the external air valve body opens and closes the external air channel, and the suction flow valve body opens and closes the suction flow channel. Therefore, the structure of such a purge valve is relatively complex.

[0003] Furthermore, DE 10 2010 029 518 A1 as well as DE 276 953 A and EP 1 997 415 A1 relate to a suction device having a purge valve. Summary of the Invention

[0004] It is therefore an object of the present invention to provide a suction appliance having an improved purge valve.

[0005] In order to achieve this object, in a suction device of the type mentioned at the outset, it is provided that the suction flow valve body has at least one external air through-channel, through which at least a part or the entire external air flow can flow in the cleaning position.

[0006] The basic idea of ​​the present invention is that at least part of the external air flow can flow through the external air through-channel in order to clean the filter element. This allows a space-saving design in which, in addition to the external air through-channel of the suction flow valve body, no further external air through-channels are necessary, or an overall larger flow cross section for the external air flow is possible, which can include both the external air through-channel of the suction flow valve body and the additional external air passage.

[0007] In particular, the relative mobility of the external air valve body and the suction flow valve body is advantageous, that is, the suction flow valve body can be fixed in position while the external air valve body moves, or the external air valve body can be fixed in position while the suction flow valve body moves, or the two valve bodies can be movable relative to the suction device housing and relative to each other. It is also possible that the suction flow valve body and the external air valve body can be moved relative to each other at different movement speeds.

[0008] An advantageous concept provides that the external air valve body can be adjusted between a position in which the external air channel is closed and a position in which the external air channel is opened, while the suction flow valve body closes the suction flow channel. This makes it possible, for example, for the suction flow channel to be already closed before the external air channel is opened by the external air valve body. Furthermore, it is possible for the suction flow channel to remain closed while the external air valve body opens the external air channel.

[0009] However, it is also possible that the suction flow valve body is adjustable between a position closing the suction flow channel and a position opening the suction flow channel, while the external air valve body closes the external air channel. Thus, for example, the suction flow valve body can be adjusted or adjusted from the suction operating position in the direction of the cleaning position without the external air valve body opening the external air channel.

[0010] Advantageously, the external air valve body can be adjusted relative to the suction flow valve body along an adjustment path between a cleaning position and a suction operating position. The adjustment path can be, for example, a linear and / or straight adjustment path. However, a curved or arc-shaped adjustment path is also possible without any problems.

[0011] Preferably, the sliding bearing is at least one of the valve bodies, wherein the sliding bearing supports the valve body in a sliding manner along a linear adjustment path axis or adjustment path. Preferably, the sliding bearing is not designed as a spiral receptacle. Preferably, the sliding bearing does not have a spiral thread.

[0012] The sliding bearing concept with such a sliding bearing is then explained:

[0013] The external air valve body is preferably mounted so as to be movable between its positions by means of a sliding bearing.

[0014] The suction flow valve body is preferably mounted so as to be movable between its positions by means of a sliding bearing.

[0015] Preferably, the external air valve body and the suction flow valve body can be adjusted relative to each other between a cleaning position and a suction operating position by means of at least one sliding bearing. For example, the suction flow valve body has a sliding bearing on which the external air valve body is slidingly supported.

[0016] Preferably, the outside air valve body and the suction flow valve body have the same direction of movement when they are moved in the direction towards their respective cleaning position and in the direction towards their respective suction operating position. Preferably, the movement of the outside air valve body and the suction flow valve body into the cleaning position or into the suction operating position is directed in the same direction.

[0017] It is advantageous if at least one of the external air through-channels or one of the external air through-channels runs through the suction flow valve body in a central region of the suction flow valve body.

[0018] Furthermore, the suction flow valve body advantageously has a closing wall for closing the suction flow channel, through which the external air through-channel extends. The closing wall is designed, for example, in the form of a top wall. Preferably, at least one external air through-channel or one of the external air through-channels extends through a central region of the closing wall.

[0019] Although it is basically possible for the closed wall to rest directly on the external air through-channel, for example, on the valve seat at the external air through-channel. However, it is advantageously provided that an elastic seal and / or a sealing profile is arranged between the closed wall and the external air through-channel, for example, the valve seat for the closed wall at the external air through-channel. This advantageously enables the external air channel and the suction flow channel to be completely or substantially sealed from one another when the suction flow valve body occupies the suction operating position. Despite the presence of this seal, small amounts of leakage are still possible without any problem or can still be optionally provided. This, for example, prevents external air from being able to flow from the external air channel into the suction flow channel and thereby flow in the direction of the suction turbine.

[0020] It has essentially been explained that when the suction flow valve body occupies the cleaning position, that is to say when the suction flow channel is closed, the closing wall of the suction flow valve body can rest against the suction flow valve seat. Advantageously, it is provided that when the suction flow valve body rests against the suction flow valve seat in the suction operating position, an elastic seal and / or a sealing contour is arranged between the closing wall and the suction flow valve seat in order to limit the suction flow channel. For example, it is feasible that a sealing contour is arranged at one of the suction flow valve body and the suction flow valve seat, and an elastic seal is arranged at the other of the suction flow valve body and the suction flow valve seat. It is also feasible that both (i.e. the valve body and the valve seat) each have an elastic seal. The elastic seal and / or the sealing contour are, for example, annular or annularly closed.

[0021] It is possible that the external air valve body can be adjusted by suitable flow and / or pressure conditions during cleaning operation and / or during suction operation into a position which closes the external air passage or opens the external air passage.

[0022] Furthermore, it is possible that when the suction appliance housing is oriented for normal suction operation, the external air valve body is held by its weight in a position closing the external air channel. In other words, when the suction appliance is placed on the ground, for example on its rollers, the weight of the external air valve body ensures that it closes or is about to close the external air channel without the influence of other forces.

[0023] Advantageously, the external air valve body is biased into a position closing the external air passage or into a position releasing the external air passage by the external air valve spring assembly. It is possible that the external air valve body is biased into the position closing the external air passage or into the position releasing the external air passage solely by means of the spring assembly, i.e., the air flow and / or pressure conditions during the purge operation or the suction operation do not influence the respective position of the external air valve body. However, it is possible that the spring assembly acts on the external air valve body to support its actuation by the air flow that occurs during the transition from the purge operation to the suction operation or vice versa.

[0024] Furthermore, the external air valve spring arrangement can ensure that the external air channel holds the external air valve body in the suction operating position in the event of an unfavorable position of the suction device housing, for example when the suction device housing is on one side or tilted.

[0025] Advantageously, the external air valve spring assembly is supported on the one hand on the external air valve body and on the other hand on the suction flow valve body of the purge valve or on a supporting structure fixedly connected to the suction unit housing, in particular the valve housing. This means that, for example, the suction flow valve body can at least partially form a seat for the external air valve body. It is also possible for the external air spring assembly to be supported directly or indirectly on the suction unit housing.

[0026] As already mentioned, the flow conditions and / or air flow and / or pressure conditions associated with the cleaning or suction operation can have an effect on the actuation of the external air valve body. This effect can occur with or without the aforementioned external air spring assembly. Preferably, the external air valve body, particularly in a design as a drive body drivable by a valve actuator, has a pressure differential surface that is loaded by a pressure differential when the external air valve body abuts against the external air valve seat, thereby closing the external air passage, the external air valve, or both. Thus, for example, the pressure differential holds the external air valve or external air valve body in a closed position, preventing external air from flowing through the external air passage. When the suction device is in suction operation, a pressure differential exists. This pressure differential is the difference between atmospheric pressure and a pressure or negative pressure less than atmospheric pressure, which is generated or has been generated by the suction turbine in a negative pressure region within the interior of the suction device housing, for example, in the area of ​​the dust collection chamber, during suction operation. The differential pressure surface is acted upon by atmospheric pressure.

[0027] For the suction flow valve body, essentially the same structural options apply as for the external air valve body, i.e. the suction flow valve body can be loaded into the suction operating position or into a position opening the suction flow channel by a spring assembly and / or pressure conditions and / or flow conditions and / or its own weight or the like.

[0028] Therefore, provision can be made for the suction flow valve body to be urged into the suction operating position and / or into a position opening the suction flow channel by the suction flow valve spring assembly.

[0029] Advantageously, the suction flow valve spring assembly is supported on the one hand on the suction flow valve body and on the other hand on the external air valve body of the purge valve or on a supporting structure fixedly connected to the suction unit housing, in particular the valve housing.

[0030] Advantageously, the purge valve has at least one valve actuator, for example, an electromagnetic or electric valve actuator, and a drive element drivable by the valve actuator for adjusting the suction flow valve element between a suction operating position and a purge position, and / or for adjusting the external air valve element between a suction operating position and a purge position. In other words, the drive element can act on both, i.e., the suction flow valve element and the external air valve element, or only on one of the valve elements. It is also possible for the drive element to have the function of a valve element, i.e., to form, for example, the external air valve element or the suction flow valve element.

[0031] Preferably, at least one valve drive is designed to adjust the suction flow valve body between the suction operating position and the cleaning position and / or to adjust the external air valve body between the suction operating position and the cleaning position, and to perform the adjustment within less than 2 seconds or 1.5 seconds, further preferably less than 1 second, further preferably less than 0.5 seconds, further preferably less than 0.4 seconds or 0.3 seconds.

[0032] In particular, the at least one valve drive is designed for abrupt adjustment of the suction flow valve element and / or the external air valve element.

[0033] The at least one valve actuator is preferably an electromagnetic actuator.

[0034] For electromagnetic actuation, it is advantageous if the drive element comprises a magnetically actuable material, so that it can be driven, for example, by an electric coil of a valve actuator or another similar drive element that generates a magnetic field. An example of such a magnetically actuable material is neodymium. It is possible for the external air valve body to also comprise a magnetically actuable material, that is, to be actuated directly by the valve actuator. However, the external air valve body can also be magnetically passive, that is, it can comprise no magnetically actuable material. Thus, for example, a drive element comprising a magnetic material can be provided to actuate the external air valve body.

[0035] Advantageously, the drive body is biased into a position assigned to the cleaning position or into a position assigned to the suction operating position by means of a drive body spring assembly. In other words, the drive body, biased by the drive body spring assembly, can bias the external air valve body in the cleaning position to open the external air passage, or in the suction operating position to close the external air passage. When the drive body actuates the suction flow valve body, the drive body spring assembly can act on the drive body and thereby on the suction flow valve body, for example, in the suction operating position to open the suction flow passage and in the cleaning position to close the suction flow passage.

[0036] An advantageous concept provides that the drive body-spring arrangement is supported on the one hand on the drive body and on the other hand on the suction flow valve body of the purge valve or on a supporting structure fixedly connected to the suction unit housing, in particular the valve housing.

[0037] Advantageously, the drive body is plate-shaped, advantageously made of metal, and / or can be actuated and / or driven by an electromagnet, for example by the valve drive already mentioned.

[0038] Although the drive body can, in principle, be a drive body that performs only a drive function, that is, is not designed in the sense of a valve body or valve unit, it is also possible for the drive body to be designed as an external air valve body, to form the external air valve body, or to be fixedly connected to the external air valve body. Thus, the drive body can be both, for example, an element that is actuated or can be actuated by the valve driver and, in addition, an external air valve body.

[0039] One embodiment of the present invention can be configured such that the drive body is adjustable relative to the external air valve body, in particular between a position for actuating the external air valve body and a position for releasing the external air valve body for movement. When the external air valve body is released for movement by the drive body, the external air valve body can be actuated, for example, by a pressure differential acting thereon and / or its weight.

[0040] Thus, that is to say, optionally, a movement play can exist between the drive body and the external air valve body.

[0041] However, the drive body can also be provided for actuating the suction flow valve body.

[0042] With regard to the suction flow valve body, it is also advantageous if the drive body has movement play relative to the suction flow valve body, for example when the drive body does not actuate or is not intended to actuate the suction flow valve body.

[0043] Preferably, the drive body has a movement clearance with respect to the external air valve body and the suction flow valve body, so that when the purge valve is adjusted from the suction operating position to the purge position, the drive body actuates the suction flow valve body in the direction toward the position of opening the external air passage, ahead of the adjustment of the external air valve body or another external air valve body in the direction toward the position of opening the external air passage, and / or when the purge valve is adjusted from the purge position to the suction operating position, the external air valve body actuates the suction flow valve body in the direction toward the position of closing the external air passage before the suction flow valve body. This movement sequence ensures that when transitioning from suction operation to purge operation, the suction flow passage is first closed and then opened again. When transitioning from purge operation to suction operation, it is advantageous to first close the external air passage and then open again. That is, the drive body can, for example, be the external air valve body and actuate the other external air valve body. However, the drive body can also be a pure drive body and / or not be designed as an external air valve body.

[0044] Advantageously, the drive body is arranged between the external air valve body and the suction flow valve body. Thus, for example, the aforementioned drive concept can be optimally achieved.

[0045] Furthermore, it is preferably provided that the drive body is arranged in the interior space of the external air valve body. For example, the external air valve body can be designed in the form of a cover or lid. The external air valve body can, for example, have a particularly cylindrical interior space which is suitable for accommodating the drive body.

[0046] In principle, it is possible that the purge valve only has an external air valve body. However, an advantageous concept is to provide two or additional external air valve bodies. Advantageously, it can be provided that the external air valve body forms a first external air valve body and that the purge valve has a second external air valve body, which is used to close the external air channel that can be closed by the first external air valve body. The second external air valve body is advantageously separate from the first external air valve body. Advantageously, the second external air valve body can be adjusted relative to the first external air valve body between a position in which the external air channel is closed and a position in which the external air channel is released. Thus, that is to say, each of the two external air valve bodies can close or open the external air channel independently of the other external air valve body. External air can only flow through the external air channel when both external air valve bodies are in a position in which the external air channel is released.

[0047] An advantageous movement sequence or kinematics can be seen as follows: Preferably, it is provided that the first external air valve body opens the external air channel before the second external air valve body when the purge valve is adjusted from the suction operating position to the purge position, and that the second external air valve body closes the external air channel before the first external air valve body when the purge valve is adjusted from the purge position to the suction operating position.

[0048] As already mentioned, the drive body can form the external air valve body. Thus, for example, it is possible that the first external air valve body is formed by the drive body or is fixedly connected to the drive body, and the second external air valve body is separate from the drive body and can be driven by the drive body.

[0049] A mechanically advantageous concept provides for different valve seats and sealing contours to be present for the external air valve body. Furthermore, the external air valve body can have different pressure differential surfaces, wherein the pressure differential surface is the surface that is acted upon or can be acted upon by the pressure differential when the external air valve body rests against its associated valve seat.

[0050] Preferably, it can be provided that, in the suction operating position, the first external air valve body rests with a first sealing contour against the first external air valve seat and the second external air valve body rests against the second external air valve seat, and that a first pressure differential surface of the first external air valve body, enclosed by the first sealing contour, is smaller than a second pressure differential surface of the second external air valve body, enclosed by the second sealing contour, wherein the pressure differential surface is or can be acted upon by a pressure differential when the respective external air valve body rests against its associated external air valve seat. The pressure differential at the first external air valve body can differ from the pressure differential at the second external air valve body.

[0051] Different sizes of differential pressure surfaces can be provided, for example, in order to actuate an external air valve body with a smaller differential pressure surface away from its external air valve seat with less force than an external air valve body with a larger differential pressure surface.

[0052] In addition, the different sizes of pressure difference surfaces realize the movement sequence.

[0053] An advantageous concept provides that the first external air valve body closes the suction flow channel relative to the second external air valve body in the suction operating position. Thus, for example, the second external air valve body can be relieved of pressure by pressure actuation or pressure loading by the first external air valve body when it assumes the suction operating position due to the pressure conditions prevailing in the suction flow channel during suction operation.

[0054] Advantageously, the second external air valve body has at least one leakage opening through which ambient air can act at atmospheric pressure on the first external air valve body. Thus, for example, atmospheric pressure can act on the first external air valve body, preferably in the sense of closing it or, in another embodiment, in the sense of opening it.

[0055] Advantageously, the purge valve has a base guide, which is fixed in position relative to the suction device housing and is in particular designed as a linear guide, on which the suction flow valve body or the external air valve body or the drive body are guided in an adjustable and movable manner. It can be said that the base guide directly guides each of the aforementioned valve bodies or drive bodies.

[0056] However, it is also possible that the valve body or the drive body or both are guided relative to or along one another. Thus, an advantageous measure can provide that the purge valve has a valve body guide, in particular designed as a linear guide, wherein the suction flow valve body and the external air valve body are guided adjustably and movably along one another by means of the valve body guide, or the suction flow valve body and the drive body are guided adjustably and movably along one another by means of the valve body guide.

[0057] The base guide portion and the valve body guide portion can be components separate from each other.

[0058] Advantageously, they interact with one another. An advantageous measure can provide that the base guide and the valve body guide engage in one another.

[0059] It is also possible that the base guide and the valve body guide have coaxial or parallel guide axes along which the component guided by the respective guide is movably mounted. It is also possible that the guide axes of the guides are separate guide axes or are angled relative to each other.

[0060] The measures explained below are also possible for opening and closing the external air channel or for opening and closing the suction flow channel.

[0061] Advantageously, a sealing contour is arranged between at least one of the external air valve body and the suction flow valve body and the valve seat associated with the respective valve body to produce a sealing connection between the valve body and the valve seat. The sealing contour is designed such that, when the two valve bodies perform an adjustment movement in the same direction from the suction operating position into the purging position or vice versa, a sealing connection can be produced between one valve body and its valve seat by means of the sealing contour, while a free distance and / or a flow opening is still present between the other valve body and its valve seat. Thus, for example, it is possible for the suction flow valve body to release the suction flow channel and the external air valve body to close the external air channel, and then for the suction flow valve body to close the suction flow channel and for the external air valve body to then move to open the external air channel only after the suction flow channel has been closed.

[0062] The sealing contour can, for example, include or be formed by an elastic seal, in particular a bellows.

[0063] A concept which is independent in itself and / or presents an independent inventive concept is then provided, which in particular simplifies the maintenance of the suction device or the purge valve. In conjunction with the preamble of claim 1 or with the preceding features, it is advantageously provided that the purge valve is arranged on a support body which can be detachably fastened to a support body receptacle of the suction device housing, wherein the support body receptacle is opposite the filter element and is designed as an opening which can be sealed by the support body.

[0064] This measure makes it possible to remove the support body from the support body receptacle in order to clean the purge valve. For example, it can be provided that at least one valve body opposite the filter element is accessible for cleaning purposes when the support body is accommodated in the support body receptacle. This valve body is, for example, the suction flow valve body and / or the external air valve body, or, if there are multiple, for example two, external air valve bodies, one of the external air valve bodies.

[0065] The support body can have a channel section, for example, for providing a suction flow channel and / or an external air channel. Therefore, a conception can be arranged so that when the support body is accommodated in the support body receiving portion, the suction flow channel and / or the external air channel are moved towards by the support body.

[0066] The typical pressure conditions during suction operation are advantageously designed such that the purge valve assumes the suction operating position without an additional actuator. It is therefore advantageous if, during suction operation of the suction appliance, the external air valve body and / or the actuator are held in the closed position, which closes the external air passage, by the negative pressure within the suction appliance housing.

[0067] Basically, it is possible that the suction device has only a single purge valve.It is also possible that the suction device has a plurality of purge valves that can be actuated simultaneously.

[0068] However, it is also possible for the suction device to have at least two purge valves, each of which is associated with a filter element, wherein the filter elements are fluidically connected to the respective purge valves such that one of the purge valves can assume a purge position for cleaning the associated filter element, while the other purge valve is in a suction operating position and the suction flow can continue to flow through the associated filter element. Furthermore, it is possible for the two or further filter elements to be connected to one another or to be part of a single filter element body. For example, a mechanical separation, flow channel, or the like can be provided so that a section of a single filter element body forms the filter element associated with the purge valve.

[0069] The suction device according to the present invention is preferably a workshop suction device. The suction device housing preferably has rollers or wheels for rolling the suction device on the floor. The suction device is preferably designed to cooperate with a machine tool, in particular a handheld machine tool or a semi-stationary machine tool. For example, the suction device has a suction inlet with a connecting pipe for connecting a suction hose, by means of which a fluid connection can be established between the suction device and the machine tool. The suction device can preferably be controlled by the machine tool, for example, to trigger cleaning.

[0070] Advantageously, the suction device has a control device by means of which at least one purge valve or its valve drive can be controlled, for example in order to actuate the purge valve from the suction operating position into the purge position and / or from the purge position into the suction operating position.

[0071] For example, if the purge valve or parts thereof and / or the filter element are components that can be removed from the suction appliance, it is advantageous to also have at least one additional filter element that fulfills an emergency or police function. Therefore, an advantageous embodiment of the invention provides that the suction appliance has at least one turbine filter element that is arranged between the suction turbine and the purge valve.

[0072] The outside air inlet can be arranged on the suction device housing and connected to the purge valve via a flow channel, the outside air inlet being in communication with the purge valve and / or the purge valve being arranged at the outside air inlet. However, it is also possible for the outside air inlet to be arranged directly on the purge valve, for example, on the valve base of the purge valve or on the valve housing of the purge valve. For example, the suction flow valve body and / or the outside air valve body can be movably supported on the valve base or the valve housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Next, embodiments of the present invention will be described with reference to the accompanying drawings, wherein:

[0074] Figure 1 shows a view from above onto the suction device,

[0075] Figure 2 Shown by Figure 1 a longitudinal section of the suction device approximately along a section line VV of the suction device, wherein the longitudinal section runs through the purge valve,

[0076] Figure 3 Show the basis Figure 2 The valve body of the cleaning valve,

[0077] Figure 4 Shown from Figure 2 Detail D5 with purge valve in suction operating position,

[0078] Figure 5 Corresponding to Figure 4 The view of FIG. 1 shows the purge valve in an intermediate position between the suction operating position and the purge position,

[0079] Figure 6 Corresponding to Figure 4 The view shows the purge valve in the purge position,

[0080] Figure 7 A perspective oblique view from below shows a support body which is provided for fastening to a suction device housing of a suction device according to the previous figures and on which the purge valve according to the previous figures is arranged,

[0081] Figure 8 Shown from above in front view Figure 7 The bracket body,

[0082] Figure 9 Show the basis Figure 7 or 8, the bracket body is approximately along the Figure 8 Cross-sectional view of the cutting line CC in

[0083] Figure 10 Shown from Figure 9 Details of D6,

[0084] Figure 11 A further section of the suction device is shown, which corresponds approximately to the section in FIG. Figure 1 The section line AA in FIG. 1 is shown and has a purge valve, which is shown in the suction operating position,

[0085] Figure 12 Show the basis Figure 11 The suction device corresponds approximately to Figure 1The cross-section diagram of the cutting line BB in

[0086] Figure 13 Show the basis Figure 12 However, the suction device has a purge valve in the purge position,

[0087] Figure 14 Shown from Figure 12 Detail D2 with the purge valve shown enlarged,

[0088] Figure 15 Shown from Figure 13 Detail D3 with the purge valve shown enlarged. DETAILED DESCRIPTION

[0089] The suction device 10 has a suction device housing 11 , on which a suction inlet 12 for the inlet of a suction flow SM is arranged.

[0090] The suction inlet 12 is suitable for connecting a suction hose SL, for example.

[0091] The suction hose SL can be connected to a machine tool WZ, for example a cutting or grinding machine tool, in particular a handheld machine tool, schematically shown in the drawing. Dust ST generated by the machine tool WZ can be sucked away by means of the suction device 10 .

[0092] The suction device 10 is, for example, a workshop suction machine.

[0093] In a schematically illustrated manner, the housing 11 can have rollers 11E, by means of which it can be rolled on the ground and / or can be placed on the ground.

[0094] The suction inlet 12 communicates with a dust collecting space 15 for collecting dust ST.

[0095] A filter bag 325 can optionally be arranged in the dust collection space 15, in which dust ST can be accommodated. When the filter bag 325 is arranged in the dust collection space 15, the filter bag 325 is fluidically connected to the suction inlet 12. The filter bag 325 can be connected, for example, to a connection pipe that communicates with the suction inlet 12. However, the suction device 10 can operate without such a filter bag without any problems, in particular due to the effective filter cleaning that will be described later.

[0096] To generate the suction flow SM, the suction device 10 has a suction turbine 14 .

[0097] The exhaust gas AB generated by the suction turbine 14 can be discharged from the housing 11 via an outlet 13 of the housing 11. The outlet 13 is arranged downstream of the suction turbine 14.

[0098] The suction turbine 14 is arranged, for example, in the region of or in the outlet 13 of the housing 11 .

[0099] In the housing 11 , a dust collecting space 15 for collecting dust ST is arranged.

[0100] The housing 11 has a peripheral wall 11B, a bottom wall 11C, and a top wall 11D, wherein the bottom wall 11C and the top wall 11D are connected to each other via the peripheral wall 11B.

[0101] The dust collecting space 15 is limited by the bottom wall 11C and the peripheral wall 11B. On the upper side or on the side opposite to the bottom wall 11C, the dust collecting space 15 can be closed or limited by the top wall 11D of the suction device housing 11 and / or by the intermediate wall 16.

[0102] For example, the suction inlet 12 is arranged at the top wall 11D or at one of the peripheral walls 11B (indicated by the suction inlet 12B) and communicates with the dust collection space 15 .

[0103] A suction flow channel 17 is formed between the intermediate wall 16 and the top wall 11D, which is flow-connected to the suction turbine 14. The suction flow SM flows through the suction flow channel 17 to the suction turbine 14 and is discharged from the suction turbine through the outlet 13 as exhaust gas AB.

[0104] The suction flow channel 17 can have channel sections 17A, 17B which each guide a portion of the suction flow SM, converge upstream of the suction turbine 14 , and via which the suction flow SM flows as a whole to the suction turbine 14 .

[0105] A turbine filter element 14A can be arranged upstream of the suction turbine 14 so that if particles are still present in the suction flow SM, which are not filtered out by the filter component explained later or remain in the suction flow SM in the case of a possibly faulty or non-compliant filter component, the dirt or particles contained in the suction flow SM can be filtered out.

[0106] Arranged between the dust collecting space 15 and the suction turbine 14 is a filter assembly 20 , by means of which dust ST is filtered out of the suction flow SM and retained in the dust collecting space 15 . The filter assembly 20 is arranged on the intermediate wall 16 .

[0107] The suction flow SM is shown with respect to its flow direction by black arrows upstream of the filter assembly 20 and by white arrows downstream of the filter assembly 20 in order to symbolically indicate that the filter assembly 20 filters dust ST out of the suction flow SM.

[0108] The filter assembly 20 includes two filter elements 25A, 25B, which are designed in the same manner and are generally designated and explained below as filter elements 25 .

[0109] The filter assembly 20 includes a filter holder 21 for supporting a filter element 25 .

[0110] The filter holder 21 is held, for example, on the intermediate wall 16 .

[0111] The filter element 25 has a flat outer shape and is formed by, for example, a pleated filter or a pleated filter.

[0112] For example, the filter element 25 is arranged on a holding receptacle 22 of the filter holder 21. The holding receptacle 22 is designed, for example, in the form of a plug-in receptacle into which the filter element 25 can be inserted.

[0113] The filter element 25 is held, for example, in a form-fitting and / or friction-fitting and / or clamping manner on the holding receptacle 22. However, it is also possible that the filter element 25 is held in a materially bonded manner on the holding receptacle 22, for example, is adhesively bonded thereto.

[0114] Preferably, the holding receptacle 22 is elastically yielding. For example, the holding receptacle 22 has an elastic holding element 23, on which the filter element 25 is held, for example, in a friction-fitting and / or form-fitting manner.

[0115] Holder 23 or holding receptacle 22 comprise for example collar, and it is made of elastic material, for example rubber, elastic plastic or similar material.Thus, filter element 25 can be remained on filter support 21 place movably, and this for example has realized the cleaning of filter element 25 and / or makes it become simple.

[0116] A support structure 24 for supporting a filter element 25 is arranged on the filter holder 21 .

[0117] The support structure 24 is air-permeable, so that air flowing through the filter element 25 can flow through the support structure 24 .

[0118] The support structure 24 is designed, for example, in the manner of a support grid or has a support grid or grid structure.

[0119] The filter element 25 rests on the support structure 24 , for example with its flat side or its greatest extension, and is supported thereby.

[0120] In other words, the filter assembly 20 filters out the dust ST contained in the suction flow SM and retains it in the dust collection space 15. Although some of the dust ST falls downward from the filter assembly 20 toward the dust collection space 15 or toward the bottom wall 11C, for example, due to gravity and / or due to vibrations generated by the suction turbine 14 during suction operation of the suction device 10, another portion of the dust ST adheres to the filter assembly 20, for example, to the filter element 25, and thus must be cleaned.

[0121] Each filter element 25A, 25B is correspondingly assigned a cleaning valve 40A, 40B to clean the corresponding filter element 25A, 25B.

[0122] The purge valves 40A, 40B (hereinafter also referred to as purge valves 40 ) have a valve body 41 which is adjustable relative to a valve seat 42 between a closed position SP blocking the suction flow channel 17 and an open position OP releasing the suction flow channel 17 .

[0123] The open position OP corresponds to the suction operating position SB of the purge valve 40, in which the suction turbine 14 can draw in a suction flow SM through the suction inlet 12 and discharge it through the outlet 13. The closed position SP is assigned to or corresponds to the purge position AR, in which the corresponding filter elements 25A, 25B are purge.

[0124] The purge valves 40A, 40B close the suction flow channel 17 in the purge position AR and open it in the suction operation position SB. Thus, the valve body 41 forms a suction flow valve body 43 and the valve seat 42 forms a suction flow valve seat 44.

[0125] Thus, the suction flow valve body 43 and the suction flow valve seat 44 form components of the suction flow valve 43A.

[0126] The suction flow valve seat 44 extends around a through-hole 44B in the support body 44A, for example, in the intermediate wall 16. The through-hole 44B allows the suction flow SM from the filter assembly 20, for example, the filter element 25, to flow through the purge valve 40 in the direction of the suction flow channel 17, which is fluidically connected to the through-hole 44B. In the closed position SP, the suction flow valve body 43 closes the through-hole 44B. The through-hole 44B forms an integral part of the suction flow channel 48 of the purge valve 40.

[0127] The bracket body 44A can form an integral part of the intermediate wall 16 or an integral part of the purge valve 40. The bracket body 44A is preferably fixedly connected to the intermediate wall 16 or is integral with the intermediate wall 16.

[0128] A sealing arrangement 45 is provided on the valve body 41 , which has a sealing contour 45A which bears against the valve seat 42 in the purge position AR or closed position SP and is removed from the valve seat 42 in the suction operating position SB or open position OP.

[0129] The sealing assembly 45 comprises an annular sealing body or sealing element 46. The sealing element 46 is preferably elastic. The sealing element 46 has, for example, a sealing lip or the like, so as to abut against the valve seat 42.

[0130] In the open position OP or suction operating position SB, a suction flow channel 48 is released, which is formed between the valve seat 42 and a side of the sealing element 46 facing the valve seat 42 and forming, for example, a sealing contour 45A.

[0131] The suction flow channel 48 communicates with the suction flow channel 17 or forms a part of the suction flow channel 17, through which the suction flow SM can flow. In the closed position SP or the purge position AR, the suction flow channel 48 is closed.

[0132] It is easy to arrange an elastic sealing element on the valve seat 42, which cooperates with the sealing element 46 and closes the suction flow channel 17 in the cleaning position AR. However, it is also possible that such a sealing element on the valve seat 42 can directly rest on a fixed component or fixed section of the valve body 41 in the cleaning position AR.

[0133] The valve body 41 can be adjusted along a particularly linear movement path BB between a washing position AR and a suction operation position SB. For example, the valve body 41 is mounted movably on a base guide 50 between the washing position AR and the suction operation position SB.

[0134] The base guide portion 50 includes a guide housing 51 in which a guide body 52, such as a guide protrusion 52A, and the valve body 41 are guided along the movement trajectory BB. For example, the guide housing 51 is a cylindrical guide housing in which a similarly cylindrical guide protrusion 52A or guide body 52 is guided.

[0135] The base guide 50 provides, for example, a sliding bearing or is part of a sliding bearing.

[0136] The suction flow valve body 43 has a closing wall 59. The closing wall 59 is designed as a closing cover, for example. The closing wall 59 has a sealing component 45 at its outer periphery. The guide body 52 protrudes in front of the closing wall 59 in the form of a guide shaft or a guide pin.

[0137] The guide accommodating portion 51 is provided on the valve base body 90. The valve base body 90 is, for example, plate-shaped. The valve base body 90 has the guide accommodating portion 51 in which the guide body 52 of the suction flow valve body 43 is accommodated so as to be linearly movable along the movement trajectory BB.

[0138] The valve base body 90 is opposite to the through-hole 44B and the suction flow valve body 43. The suction flow valve body 43 is supported so as to be movable toward and away from the valve base body 90 along a movement trajectory BB.

[0139] On the side facing the suction flow valve body 43, the valve base body 90 has a valve seat 91 for the suction flow valve body 43. When the purge valve 40 adopts the suction operating position SB, the suction flow valve body 43 is removed from the valve seat 91. When the purge valve 40 adopts the purge position AR, the suction flow valve body 43 adopts the open position OP relative to the suction flow valve seat 44, and the suction flow valve body 43 abuts against the valve seat 91.

[0140] In this position, the external air passage opening 92 on the valve basic body 90 communicates with the external air passage 55 on the suction flow valve body 43 .

[0141] The external air through-channel 55 is provided on the closing wall 59 of the suction flow valve body 43. For example, four external air through-channels 55 are provided annularly around the guide body 52 and / or around the movement axis or central axis M of the purge valve 40, which coincides with the movement trajectory BB.

[0142] The external air through-opening 92 extends annularly around the guide receptacle 51 on the valve basic body 90. The flow cross sections of the external air through-opening 92 and of the external air through-channel 55 are preferably identical or substantially the same.

[0143] For example, connecting webs 55A extend between the closing wall 59 and the guide body 52 , between which connecting webs an external air passage 55 is formed.

[0144] That is, when the suction flow valve body 43 abuts the valve seat 91, external air FL can flow through the external air through-channel 55. In this position of the suction flow valve body 43 (i.e., the closed position SP), the external air through-channel 55 is sealed relative to the suction flow channel 17 by the sealing contour 45B. As a result, external air FL cannot flow into the suction flow channel 17.

[0145] The sealing contour 45B is formed, for example, by an elastic sealing element, preferably a sealing element designed in the same manner as the sealing element 46 .

[0146] The sealing contour 45B and the sealing contour 45A extend annularly and / or concentrically around the center axis M and / or around the guide body 52 .

[0147] Between the sealing contours 45A and 45B, the closure wall 59 can have a step 59A. As a result, the external air through-channel 59 is arranged at a section of the closure wall 59 that projects in the direction of the valve basic body 90 .

[0148] The suction flow valve body 43 is biased toward its open position OP by a spring assembly 54 and thereby into the suction operating position SB of the purge valve 40. The spring assembly 54 comprises, for example, a coil spring. The spring assembly 54 is supported on the valve base 90 on one hand and on the suction flow valve body 43 on the other hand. The spring assembly 54 is passed through, for example, the guide body 52.

[0149] In order to actuate the purge valve 40 and thus the suction flow valve body 43 from the suction operating position SB to the purge position AR, a valve drive 80 is provided. The valve drive 80 comprises a stator 81 and a rotor or drive body 82. The drive body 82 can be actuated magnetically, that is, for example, the drive body 82 can be driven by a magnetic field from the stator 81. For example, a coil assembly 83, such as an electric coil, is arranged on the stator 81.

[0150] The drive body 82 is designed, for example, in the form of a disk or a plate.

[0151] For example, the driving body 82 is configured as a metal plate 84 made of ferromagnetic metal.

[0152] The drive body 82 is guided along the motion path BB in the valve body guide 60, that is, in this case, linearly. The valve body guide 60 has a guide receptacle 61, in which or on which the guide body 62 is guided. The guide body 62 is fixedly connected to the drive body 82. For example, the guide body 62 is designed as a pin protruding from the drive body 82.

[0153] The valve body guide 60 is designed as a sliding bearing or forms a sliding bearing, for example.

[0154] The guide receptacle 61 is provided on the guide body 52 of the suction flow valve body 43 and extends, for example, as a hole or guide receptacle. The guide body 62 engages in the guide receptacle 61. As a result, the drive body 82 is guided on the suction flow valve body 43 along the movement path BB.

[0155] The coil assembly 83 can be energized by means of a current supply device 104. A control device 100 is provided for controlling the current supply device 104. The control device 100 comprises a processor 101 and a memory 102, in which a control program 103 is stored.

[0156] The control program 103 includes instructions that can be executed by the processor 101 in order to control the suction device 10 and / or the power supply mechanism 104 .

[0157] The drive body 82 has a movement clearance relative to the suction flow valve body 43. This means that the drive body 82 can be moved from the suction operation position SB to the cleaning position AR before the suction flow valve body 43. The drive body 82 acts on the suction flow valve body 43 via the drive body spring assembly 87.

[0158] The spring assembly 87 comprises, for example, a coil spring which is supported on the one hand on the valve body 43 and on the other hand on a support contour 88 which is connected to the drive body 82. For example, the support contour 88 is arranged on a free section of the guide body 62 which projects before the guide receptacle 61.

[0159] Premature actuation of the drive body 82 allows it to be actuated from the suction operating position SB before the suction flow valve body 43 , which proves advantageous when the filter assembly 20 is acted upon by an external air flow FS containing external air FL, as will be explained below.

[0160] External air FL can flow into the external air channel 18 through the external air inlet 19 of the suction device 10. The external air channel 18 can be closed by the drive body 82, so that the drive body 82 forms the external air valve body 63. The external air valve body 63 or the drive body 82 is, for example, plate-shaped and can be lifted from the external air valve seat 64, so that the external air FL can flow into the external air passage opening 92 next to the external air valve seat 64.

[0161] The external air valve seat 64 is provided at the valve base body 90. The external air valve seat 64 and the valve seat 91 are arranged at sides of the valve base body 90 that are opposite to each other.

[0162] The outside air valve body 63 and the outside air valve seat 64 form components of the outside air valve 63A.

[0163] An external air sealing assembly 65 is arranged on the external air valve seat 64. The external air sealing assembly 65 comprises, for example, a sealing element 66. When the drive body 82 and thus the external air valve body 63 abut against the external air valve seat 64, the external air valve seat abuts against the sealing element 66, thereby closing the external air channel 18.

[0164] The function of the drive body 82 as the external air valve body 63 is an optional solution, that is, it is not necessarily required. That is, the purge valve 40 has an additional external air valve body 73, so that the external air valve body 63 forms the first external air valve body and the external air valve body 73 forms the second external air valve body.

[0165] The external air valve body 73 is suitable for closing the external air channel 18. The external air valve body 73 is lifted from the external air valve seat 74 into the open position OP, thereby opening the external air channel 18 and / or allowing external air FL to flow into the external air passage opening 92 next to the external air valve seat 74. Conversely, in the closed position SP, the external air valve body 73 abuts the external air valve seat 74, thereby closing the external air channel 18. An external air sealing assembly 75 having an external air sealing element 76 is advantageously arranged on the external air valve seat 74.

[0166] The outside air valve body 73 and the outside air valve seat 74 form components of the outside air valve 73A.

[0167] The outside air sealing element 66 is arranged in the interior space of the outside air valve 73 and / or in the interior space bounded by the outside air sealing element 76 and / or within the outside air sealing element 76. The outside air sealing elements 66 and 76 are arranged concentrically. Thus, when atmospheric pressure acts on the outside air valve bodies 63 and 73 in their closed position SP, and when there is a negative pressure generated by the suction turbine 14 or a pressure lower than atmospheric pressure within the suction unit housing 11, the pressure differential surface DD1 of the outside air valve body 63 is smaller than the pressure differential surface DD2 of the outside air valve body 73.

[0168] Alternatively, it is possible to provide a leakage opening 79 on the external air valve body 73 , through which the atmospheric pressure can act on the external air valve body 63 .

[0169] The foreign air sealing elements 66 and 76 are, for example, concentric with respect to one another.

[0170] Foreign air sealing elements 66 and 76 provide sealing contours for foreign air valve bodies 63 and 73 at valve seats 64 and 74 .

[0171] The foreign air sealing elements 66 and 76 are preferably designed as annular seals.

[0172] The external air valve body 73 is held and guided at the guide holder 70 .

[0173] The guide holder 70 is provided, for example, on a driver support 89 of the valve driver 80. A coil assembly 83 is arranged on the driver support 89. The driver support 89 is, for example, the stator 81 of the valve driver 80.

[0174] The driver support 89 is designed as a plate-shaped body or a cover-shaped body, for example.

[0175] The drive holder 89 can be designed as a component that can be subsequently mounted on the suction device 10 and / or the purge valve 40 , so that the purge valve 40 can subsequently be equipped with the valve drive 80 and the external air valve 73A.

[0176] The guide holder 70 has a spring receptacle 71 for an external air valve spring assembly 72. The spring assembly 72 comprises, for example, a coil spring 72A. The coil spring 72A is supported on the one hand on the guide holder 70, in particular at the bottom of the spring receptacle 71, and on the other hand on the external air valve body 73, for example, on a flange projection 77 or a flange of the external air valve body 73.

[0177] The spring assembly 72 guides the external air valve body 73 parallel to the movement path BB. Here, the external air valve body 73 has a certain movement play transversely to the movement path BB due to the elastic properties of the spring assembly 72.

[0178] The external air valve body 73 is designed in the manner of a closing cap for closing the external air valve seat 74. The external air valve body 73 has a receptacle 78 or an interior space in which the drive body 82 or the external air valve body 63 is accommodated.

[0179] The outside air valve body 63 or the drive body 82 has a movement play relative to the outside air valve body 73. As a result, it is possible that the drive body 82 is first adjusted from the position assigned to the suction operating position SB in the direction of its position assigned to the rinse position AR, that is, is lifted from the outside air valve seat 64, before the drive body acts on the outside air valve body 73 in the sense of being lifted from its outside air valve seat 74 and / or in the sense of adjusting the outside air valve body 73 into the open position OP.

[0180] Even with the leakage opening 79 , the external air valve body 73 still has a sealing function, so that the influence of external air or atmospheric pressure on the external air valve body 63 is reduced even when the external air valve body 73 does not rest completely sealingly on the external air valve seat 74 .

[0181] The valve drive 80 can be partially disassembled. Thus, for example, it is possible to remove the drive holder 63 and thus the stator 81 from the purge valve 40 without the external air FL being able to flow through the purge valve 40. In other words, in this case, during suction operation of the suction device 10, atmospheric pressure acts on the external air valve body 63, even if it is not actively driven or can be driven, for example by energizing the coil assembly, so that the valve body 63 remains in its closed position SP.

[0182] Subsequently, an advantageous maintenance concept for the suction device 10 is provided, which is possible but not necessary.

[0183] The valve basic body 90 is arranged, for example, on the support body 30 or is provided by the support body 30. The support body 30 is, for example, a component of a cover or forms a cover which can be detachably fastened to the vacuum appliance housing 11.

[0184] For example, the support body 30 can be releasably fixed to a support body receptacle 31 of the suction device housing. The support body receptacle 31 is opposite the filter element 25 of the filter assembly 20. For example, two support body receptacles 31 for each support body 30 are arranged on the upper wall or top wall 11D of the suction device housing 11. When the support body 30 is removed from the support body receptacle 31, the components of the purge valve 40 facing the filter element 25 when the support body 30 is installed in the support body receptacle 31 are easily accessible.

[0185] The support body 30 has, for example, a base wall 32, to which the purge valve 40 is fixed and / or which provides the valve base 90. A plug-in contour 33 projects from the base wall 32, for example at the outer periphery of the base wall 32. The plug-in contour 33 can be inserted into a support body receptacle 31 designed as a plug-in receptacle.

[0186] Furthermore, latching means 34 are provided for securing the support body 30 on the support body receptacle 31. The latching means 34 comprise, for example, latching straps and / or latching noses 35, which can be brought out of engagement with a latching contour 36 of the support body receptacle 31 by actuating an actuating projection 37. The support body 30 can then be removed from the support body receptacle 31. The latching contour 36 is arranged on the support body receptacle 31.

[0187] In this regard, it should be noted that the purge valves 40A, 40B are advantageously switched alternately to the purge position AR by the control device 100, that is, one of the purge valves 40A or 40B is in the suction operating position SB, while the other purge valve 40A or 40B performs the cleaning of the associated filter element 25. As a result, the suction device 10 can continue to perform suction operation even if one of the filter elements 25A or 25B is being cleaned.

[0188] The suction device 10B has two identically designed purge valves 140A and 140B, which will be generally described below as purge valves 140. In the purge valves 140 and the suction device 10B, mechanical cleaning of the filter elements 25 is combined with cleaning of the filter elements 25 using external air or according to the counterflow principle (wherein, during cleaning, external air flows through the respective filter element 25 in the opposite direction of the suction flow). A purge valve 140A, 140B is associated with each filter element 25A, 25B.

[0189] The suction device 10B has the suction device housing 11, the suction turbine 14, and the outlet 13 and suction inlet 12 already explained. The suction device 10B is provided with purge valves 140A and 140B. The suction devices 10 and 10B differ only in the purge valves 40A and 40B and 140A and 140B. That is, unlike the suction device 10, the suction device 10B does not have purge valves 40A and 40B, but rather has purge valves 140A and 140B.

[0190] The purge valve 140 has a valve body 141, which is mounted so as to be movable along a movement path BB by means of a base guide 150, wherein the valve body 141 is lifted from the valve seat 142 in the suction operating position SB and thereby adopts an open position OP, thereby releasing the suction flow channel 48 that is fluidically connected to the suction flow channel 17. In the purge position AR, the valve body 141 rests on the valve seat, so that it adopts a closed position SP and closes the suction flow channel 17.

[0191] The valve body 141 forms the suction flow valve body 43. The valve seat 142 is the suction flow valve seat 44. The suction flow valve body 43 and the suction flow valve seat 44 form an integral part of a suction flow valve 143A.

[0192] For contact with the suction flow valve seat 44 , a sealing arrangement 145 is provided, which is arranged on the valve body 141 or 43 .

[0193] The sealing assembly 145 comprises a cylindrical sealing body or cylindrical sealing element 146. When the sealing contour 145A of the sealing assembly 145, that is, for example, the free end side of the sealing element 146, abuts against the suction flow valve seat 44, that is, when the cleaning position AR is occupied, it is still possible to move the valve body 141 along the movement path BB to a predetermined extent in order to mechanically actuate the filter element 25.

[0194] Projecting in front of the valve body 141 is a filter drive element 185 which is mechanically connected to the filter element 25 or which can act on the filter element 25. For example, the filter drive element 185 is arranged in the interior of the sealing element 146 and projects in front of it.

[0195] The basic guide 150 for guiding the valve body 141 has a guide receptacle 151 provided, for example, by the inner wall surface of the cylindrical valve base body 190. The valve body 141 is guided along the movement path BB in the guide receptacle 151 and thus forms a guide body 152.

[0196] At the same time, the valve base body 190 forms a channel body for forming the outside air flow channel 68 of the outside air channel 18, through which the outside air FL flowing in through the outside air inlet 19 can flow as the outside air flow FLS. The valve base body 190 limits the outside air channel 18 or the outside air flow channel 68 on the peripheral side.

[0197] The valve base body 190 extends as far as the external air inlet 19 of the suction appliance housing 11 and can be closed, as it were, by the valve body 141 on the side opposite the external air inlet 19 .

[0198] However, an external air through-channel 155 is provided at the valve body 141, through which external air FL flowing into the external air inlet 19 can flow from the external air channel 18 to the filter element 25. The external air channel 18 passes through the filter drive element 185, for example, and opens at its free end region having the external air outflow opening 157B, so that the external air FL can flow through the filter drive element 185 or its drive protrusion 186 in the direction toward the filter element 25.

[0199] In order to close the external air channel 18, an external air valve body 163 of the purge valve 140 is provided, which in the suction operating position SB rests on the external air valve seat 164 and closes the external air channel 18, and in the purge position AR is lifted from the external air valve seat 164 so that external air FL can flow into the external air channel 18 through the external air inlet 19. For example, the external air valve seat 164 is provided on the inner circumference of the external air inlet 19.

[0200] A schematically shown outside air sealing assembly 165 can be provided at the outside air inlet 19. For example, an elastic sealing body or a sealing element 166 of the outside air sealing assembly 165, such as an annular seal or the like, can be provided at the inner periphery of the outside air inlet 19 and / or at the outer periphery of the outside air valve body 163.

[0201] The external air valve body 163 is provided on the channel body 156. The channel body 156 has an inflow opening or a flow-through opening 157 on its outer circumference, through which external air FL can flow into the channel section 158 of the channel body 156.

[0202] The channel section 158 is flow-connected to the external air through-channel 155 at the drive protrusion 186 or forms a section of the external air through-channel 155, so that the external air FL flowing into the channel body 156 can flow in the direction toward the filter element 25 at the free end area of ​​the external air through-channel 155.

[0203] That is to say, the outside air valve body 163 thus forms a valve unit or a valve body of an outside air valve 163A, by means of which the outside air flow passage 68 through which the outside air FL can flow can be opened or closed.

[0204] The valve actuator 180 has, for example, a stator 81 with a coil assembly 183. The coil assembly 183 acts on a magnet 184 connected to the valve body 141. In other words, the valve body 141 forms the rotor or drive body 82 of the valve actuator 180 or comprises the rotor or drive body 82.

[0205] The current supply mechanism 104 is used to supply current to the coil assembly 183 . Thus, the control mechanism 100 can control the valve drive 180 by correspondingly controlling the current supply mechanism 104 .

[0206] The cleaning valve 140 is designed for mechanical actuation of the filter element 25 and for cleaning with external air FL or by means of the counterflow principle. That is, the external air FL flows through the filter element 25 counter to the flow direction of the suction flow SM, so that the filter element 25 is cleaned mechanically and / or by the external air flow.

[0207] For example, the control mechanism 100 controls the valve drive 180 to perform an oscillating operation, a pulsed movement, or the like on the filter element 25. By means of the oscillating operation, the pulsed movement, or the like, the filter element 25 can be mechanically loaded so that dust ST adhering to the filter element 25 can be shaken off during the cleaning operation AR.

Claims

1. A suction device comprising a suction device housing (11) in which a suction turbine (14) for generating a suction flow (SM) is arranged, wherein: The suction device housing (11) has a suction inlet (12) for admitting the suction flow (SM) and a dust collecting space (15) for collecting dust contained in the suction flow (SM) during suction operation of the suction device (10), wherein a filter element (25) for retaining dust in the dust collecting space (15) is arranged between the dust collecting space (15) and the suction turbine (14), wherein a cleaning valve (40, 140) is arranged between the filter element (25) and the suction turbine (14), wherein the cleaning valve (40, 140) has a suction flow valve (43A) with a suction flow valve body (43), which closes a suction flow channel (17) in a cleaning position (AR) and releases it in a suction operating position (SB), the suction flow channel extending between the suction turbine (14) and the filter element (25) and capable of being removed by the suction flow (SM). Flowing through, and wherein the cleaning valve (40, 140) has an external air valve (63A, 73A) with an external air valve body (63, 73), the external air valve body closes the external air channel (18) in the suction operating position (SB) and releases it in the cleaning position (AR), the external air channel runs between the filter element (25) and an external air inlet (19) provided for allowing external air to flow in, so that the external air flow (FLS) flowing in through the external air inlet (19) can flow through the filter element (25) in a flow direction opposite to the suction flow (SM) to clean the filter element, characterized in that the suction flow valve body (43) has at least one external air through-channel (55), through which at least a part of or all of the external air flow (FLS) can flow in the cleaning position (AR).

2. The suction device according to claim 1, characterized in that The external air valve body (63, 73) is adjustable between a position closing the external air passage (18) and a position opening the external air passage (18), while the suction flow valve body (43) closes the suction flow passage (17), and / or the suction flow valve body (43) is adjustable between a position closing the suction flow passage (17) and a position opening the suction flow passage (17), while the external air valve body (63) closes the external air passage (18).

3. The suction device according to claim 1 or 2, characterized in that The external air valve body (63, 73) is adjustable relative to the suction flow valve body (43) along a particularly linear adjustment path (BB) between the cleaning position (AR) and the suction operating position (SB), particularly by means of at least one sliding bearing.

4. Suction device according to any one of the preceding claims, characterized in that The suction flow valve body (43) has a closing wall (59) for closing the suction flow channel (17) through which the external air through-channel (55) runs, in particular in the central region of the suction flow valve body (43).

5. The suction device according to claim 4, characterized in that An elastic seal and / or a sealing contour is arranged between the closing wall (59) and the external air through-channel (55) for sealing the external air channel (18) and the suction flow channel (17) relative to one another, so that the external air channel (18) and the suction flow channel (17) are advantageously sealed substantially or completely relative to one another in the suction operating position (SW) of the suction flow valve body (43).

6. The suction device according to claim 4 or 5, characterized in that An elastic seal and / or a sealing contour is arranged between the closing wall (59) and the suction flow valve seat (44) in order to limit the suction flow channel (17) when the suction flow valve body (43) abuts against the suction flow valve seat (44) in the suction operating position (SB).

7. Suction device according to any one of the preceding claims, characterized in that The external air valve body (63, 73) is loaded into a position closing the external air passage (18) or a position releasing the external air passage (18) by an external air valve spring assembly (72).

8. Suction device according to claim 7, characterized in that The external air valve spring assembly (72) is supported on the one hand on the external air valve body (63, 73) and on the other hand on the suction flow valve body (43) of the purge valve (40, 140) or on a supporting structure fixedly connected to the suction device housing (11), in particular a valve housing.

9. Suction device according to any one of the preceding claims, characterized in that The external air valve body (63, 73), in particular in the design of a drive body (82) that can be driven by a valve drive (80; 180), has a pressure difference surface (FL1, FL2), when the external air valve body (63, 73) is in contact with the external air valve seat (164), the pressure difference surface is loaded by the pressure difference in the sense of closing the external air valve (63A, 73A) and / or closing the external air channel (18).

10. Suction device according to any one of the preceding claims, characterized in that The suction flow valve body (43) is urged into a suction operation position (SB) and / or into a position opening the suction flow channel (17) by a suction flow valve spring assembly (54).

11. Suction device according to claim 10, characterized in that The suction flow valve spring assembly (54) is supported on the one hand on the suction flow valve body (43) and on the other hand on the external air valve body (63, 73) of the purge valve (40, 140) or on a supporting structure fixedly connected to the suction device housing (11), in particular a valve housing or a valve base (90).

12. Suction device according to any one of the preceding claims, characterized in that The purge valve (40, 140) has a valve drive (80; 180), in particular an electromagnetic or electric one, and a drive body (82) that can be driven by the valve drive (80; 180) for adjusting the suction flow valve body (43) between the suction operating position (SB) and the purge position (AR) and / or for adjusting the external air valve body (63, 73) between the suction operating position (SB) and the purge position (AR).

13. The suction device according to claim 12, characterized in that The drive body (82) comprises a magnetically actuatable material and / or the external air valve body (63, 73) does not comprise a magnetically actuatable material.

14. The suction device according to claim 12 or 13, characterized in that The drive body (82) is urged by a drive body spring assembly (87) into a position assigned to the cleaning position (AR) or into a position assigned to the suction operating position (SB).

15. The suction device according to claim 14, characterized in that The drive body spring assembly (87) is supported on the one hand on the drive body (82) and on the other hand on the suction flow valve body (43) of the cleaning valve (40, 140) or on a supporting structure fixedly connected to the suction device housing (11), in particular a valve housing.

16. The suction device according to any one of claims 12 to 15, characterized in that The drive body (82) is designed in a plate-shaped manner and / or is made of metal and / or can be driven by an electromagnet.

17. The suction device according to any one of claims 12 to 16, characterized in that The driving body (82) is designed as an external air valve body (63) or forms the external air valve body (63) or is fixedly connected to the external air valve body (63).

18. The suction device according to any one of claims 12 to 17, characterized in that The drive body (82) is adjustable relative to the external air valve body (73), in particular between a position for operating the external air valve body (73) and a position for releasing the external air valve body (73) for movement.

19. The suction device according to any one of claims 12 to 18, characterized in that The drive body (82) has a movement clearance with respect to the external air valve body (73) and with respect to the suction flow valve body (43), so that the drive body (82) operates the suction flow valve body (43) in a direction toward a position for closing the suction flow channel (17) in advance of the adjustment of the external air valve body (73) in a direction toward a position for releasing the external air channel (18) when adjusting the cleaning valve (40, 140) from the suction operation position (SB) to the cleaning position (AR), and / or operates the external air valve body (73) in a direction toward a position for closing the external air channel (18) before the suction flow valve body (43) when adjusting the cleaning valve (40, 140) from the cleaning position (AR) to the suction operation position (SB).

20. The suction device according to any one of claims 12 to 19, characterized in that The driving body (82) is arranged between the external air valve body (73) and the suction flow valve body (43), and / or the driving body (82) is arranged in the inner space of the external air valve body (73).

21. Suction device according to any one of the preceding claims, characterized in that The external air valve body forms a first external air valve body (63), and the purge valve (40, 140) has a second external air valve body (73), which is used to close the external air channel (18) that can be closed by the first external air valve body, and the second external air valve body is separated from the first external air valve body (63) and / or can be adjusted between a position of closing the external air channel (18) and a position of releasing the external air channel (18) relative to the first external air valve body (63).

22. The suction device according to claim 21, characterized in that The first external air valve body (63) releases the external air channel (18) before the second external air valve body (73) when the cleaning valve (40, 140) is adjusted from the suction operating position (SB) to the cleaning position (AR), and the second external air valve body (73) closes the external air channel (18) before the first external air valve body (63) when the cleaning valve (40, 140) is adjusted from the cleaning position (AR) to the suction operating position (SB).

23. The suction device according to claim 21 or 22, characterized in that The first external air valve body (63) is formed by the drive body (82) or is fixedly connected to the drive body (82), and the second external air valve body (73) is separated from the drive body (82) and can be driven by the drive body (82).

24. The suction device according to any one of claims 21 to 23, characterized in that In the suction operating position (SB), the first external air valve body (63) abuts against the first external air valve seat (64) with a first sealing contour and the second external air valve body (73) abuts against the second external air valve seat (74), and a first pressure difference surface (DD1) of the first external air valve body surrounded by the first sealing contour is smaller than a second pressure difference surface (DD2) of the second external air valve body surrounded by the second sealing contour, wherein, when the corresponding external air valve body (63, 73) abuts against its assigned external air valve seat (64, 74), the pressure difference surfaces (DD1, DD2) are loaded by the pressure difference.

25. The suction device according to any one of claims 21 to 24, characterized in that The first external air valve body (63) closes the suction flow channel (17) relative to the second external air valve body (73) in the suction operating position (SB).

26. The suction device according to any one of claims 21 to 25, characterized in that The second external air valve body (73) has at least one leakage opening (79) through which ambient air at atmospheric pressure can act on the first external air valve body (63).

27. Suction device according to any one of the preceding claims, characterized in that The purge valve (40, 140) has a base guide (50) which is fixed in position relative to the suction device housing (11) and is in particular designed as a linear guide, on which the suction flow valve body (43) or the external air valve body (63) or the drive body (82) is guided in an adjustably movable manner.

28. Suction device according to any one of the preceding claims, characterized in that The purge valve (40, 140) has a valve body guide (60) which is particularly designed as a linear guide, wherein the suction flow valve body (43) and the external air valve body (63), in particular the first external air valve body (63), are guided relative to each other in an adjustably movable manner by means of the valve body guide (60), or the suction flow valve body (43) and the drive body (82) are guided relative to each other in an adjustably movably manner by means of the valve body guide (60).

29. The suction device according to claim 28, characterized in that The base guide (50) and the valve body guide (60) engage with one another and / or have coaxial or parallel guide axes relative to one another, along which a component guided by the respective guide is movably mounted on the guide.

30. Suction device according to any one of the preceding claims, characterized in that A sealing contour (145A) is arranged between at least one of the external air valve body (63) and the suction flow valve body (43) and the valve seat (142) assigned to the corresponding valve body in order to establish a sealed connection between the valve body (141) and the valve seat (142). The sealing contour is designed so that when the two valve bodies perform an adjustment movement in the same direction from the suction operating position (SB) to the cleaning position (AR) or vice versa from the cleaning position (AR) to the suction operating position (SB), a sealed connection can be established between one valve body and its valve seat by means of the sealing contour, while there is still a free distance and / or a flow opening between the other valve body and its valve seat.

31. The suction device according to claim 30, characterized in that The sealing contour comprises an elastic seal, in particular a bellows.

32. Suction device according to any of the preceding claims or according to the preamble of claim 1, characterized in that The cleaning valve (40, 140) is arranged on a support body (30), which can be detachably fixed to a support body receptacle (31) of the suction device housing (11), wherein the support body receptacle (31) is opposite to the filter element (25) and is designed as an opening, which can be sealed by the support body (30).

33. The suction device according to claim 32, characterized in that When the support body (30) is accommodated in the support body accommodating portion (31), the suction flow channel (17) and / or the external air channel (18) run through the support body (30).

34. Suction device according to any one of the preceding claims, characterized in that When the suction device (10) is in suction operation, the external air valve body (63) and / or the drive body (82) are held in a closed position that closes the external air channel (18) by the negative pressure within the suction device housing (11).

35. Suction device according to any one of the preceding claims, characterized in that The suction device has at least two cleaning valves (40A, 40B), each of which is assigned a filter element (25A, 25B), wherein the filter element (25A, 25B) is flow-connected to the corresponding cleaning valve (40A, 40B) so that one of the cleaning valves (40A, 40B) can occupy the cleaning position (AR) for cleaning the filter element (25A, 25B) assigned thereto, while the other cleaning valve (40A, 40B) is in the suction operating position (SB) and the suction flow (SM) can continue to flow through the filter element (25A, 25B) assigned thereto.

36. Suction device according to any one of the preceding claims, characterized in that The suction device has at least one turbine filter element (14A) arranged between the suction turbine (14) and the purge valve (40, 140).

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