EP2547463B1 - Surface-cleaning head and surface-cleaning arrangement - Google Patents

Surface-cleaning head and surface-cleaning arrangement Download PDF

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Publication number
EP2547463B1
EP2547463B1 EP11708819.5A EP11708819A EP2547463B1 EP 2547463 B1 EP2547463 B1 EP 2547463B1 EP 11708819 A EP11708819 A EP 11708819A EP 2547463 B1 EP2547463 B1 EP 2547463B1
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EP
European Patent Office
Prior art keywords
channel
cleaning head
surface cleaning
cleaning
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11708819.5A
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German (de)
French (fr)
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EP2547463A2 (en
Inventor
Felix Treitz
Stefan Schilpp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfred Kaercher SE and Co KG
Original Assignee
Alfred Kaercher SE and Co KG
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Application filed by Alfred Kaercher SE and Co KG filed Critical Alfred Kaercher SE and Co KG
Publication of EP2547463A2 publication Critical patent/EP2547463A2/en
Application granted granted Critical
Publication of EP2547463B1 publication Critical patent/EP2547463B1/en
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Anticipated expiration legal-status Critical

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/024—Cleaning by means of spray elements moving over the surface to be cleaned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/026—Cleaning by making use of hand-held spray guns; Fluid preparations therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
    • B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
    • B08B2203/0229—Suction chambers for aspirating the sprayed liquid

Definitions

  • the invention relates to a surface cleaning head for cleaning a surface, having a housing which has a cleaning chamber surrounded by a peripheral wall, downwardly open cleaning space in which at least one cleaning nozzle is freely rotatably mounted on a spray arm about a rotation axis for applying cleaning liquid to be cleaned Surface, and with a jet pump for sucking on the surface of applied cleaning liquid, the jet pump having a communicating with the cleaning chamber in fluid communication pump inlet channel, which adjoins the peripheral wall of the cleaning chamber and is connected via a mixing chamber with a collecting channel, upstream of the collecting channel a motive nozzle is arranged to form a suction flow.
  • a surface cleaning head is from the US 4,895,179 known.
  • a spray lance of a high-pressure cleaning device can be connected to the surface cleaning head so that the cleaning nozzle arranged on the spray arm can be supplied with pressurized cleaning fluid from the high-pressure cleaning device.
  • the cleaning nozzle By means of the cleaning nozzle, the cleaning liquid can be sprayed onto the surface to be cleaned.
  • the nozzle experiences a recoil, so that the spray arm is rotated about the axis of rotation.
  • at least two diametrically opposite spray arms are used, each carrying a cleaning nozzle, wherein the nozzles are acted upon simultaneously with pressurized cleaning liquid.
  • the known surface cleaning head on a jet pump which operates on the principle of a Venturi pump.
  • the jet pump is arranged above the housing and is in fluid communication with the cleaning space via a connection line leading laterally along the cleaning space.
  • the jet pump comprises a pump inlet channel, to which a mixing chamber and this followed by a capture channel. Upstream of the catch channel a drive nozzle is arranged in alignment with the catch channel, which can be acted upon with pressurized cleaning liquid and thereby forms a suction flow in the mixing chamber and the catch channel.
  • the catching channel is followed by a diffuser. An outlet pipe can be connected to the diffuser.
  • the suction flow generated by the motive nozzle makes it possible to absorb the liquid applied to the surface to be cleaned together with cleaned dirt and to dispense it via the outlet conduit.
  • the pressurized cleaning liquid can be supplied, and with a jet pump for sucking applied to the surface cleaning liquid are also from the DE 100 66 009 B4 and the DE 103 13 396 B4 known. Also in these surface cleaning heads, the supply of cleaning fluid to the motive nozzle is carried out under a high pressure and high flow rate.
  • a surface cleaning head having the features of the preamble of claim 1 is known. He has a jet pump on, the pump inlet channel is designed as a flexible conduit which adjoins the peripheral wall of the cleaning chamber and is oriented obliquely to the vertical.
  • WO 2005/028132 A1 From the WO 2005/028132 A1 is a high-pressure cleaner known with a foam generation system in which an injector is used. With the help of the injector, a cleaning liquid can be mixed with a chemical.
  • the injector has an inlet and an outlet, which are connected to one another via a detergent line passing through the injector.
  • a chemical line opens vertically into the detergent line. Upstream of the mouth region, the cleaning agent line forms a cylindrical drive channel, which opens into the mouth region via a conical end section and upstream of which a feed channel, which continuously tapers in the flow direction, is arranged upstream.
  • the cleaning agent line Downstream of the mouth region, the cleaning agent line forms a cylindrical collecting channel, which has approximately 6 times the length of the driving channel in the flow direction and whose diameter is approximately 1.25 times the diameter of the driving channel.
  • An outlet channel adjoins the capture channel in the flow direction, with a first outlet section, which widens conically in the flow direction with a cone angle of approximately 10 °, and with a second outlet section, which conically tapers with a cone angle of approximately 60 ° up to the exit of the injector extended.
  • Object of the present invention is to develop a generic surface cleaning head such that the pressure and flow rate of the cleaning fluid can be reduced without significant loss of suction of the suction pump.
  • the diameter of the catch channel is 14 mm to 18 mm and the distance between the motive nozzle and the collecting channel is at least 10 mm.
  • the pump inlet channel connects with aligned in the radial direction of the longitudinal axis of the cleaning chamber.
  • the pump inlet channel is connected via the mixing chamber with the capture channel and upstream of the capture channel, the motive nozzle is arranged.
  • the mixing chamber is thus arranged as well as the motive nozzle at a short distance to the cleaning room and thus at a short distance to the surface to be cleaned.
  • an effective suction flow is formed in the cleaning room, with the aid of which the surface to be cleaned can be sucked off, wherein the pressure of the drive nozzle supplied cleaning fluid can be selected smaller than in the surface cleaning head, from the US 4,895,179 is known.
  • the pressure of the cleaning fluid supplied to the motive nozzle may be less than 150 bar and the delivery rate may be less than 800 liters per hour, in particular less than 600 liters per hour.
  • a further increase in the effectiveness of the surface cleaning head is inventively achieved in that the diameter of the catch channel is 14 mm to 18 mm.
  • the diameter of the catch channel is 14 mm to 18 mm.
  • the air passage through the catch channel is relatively small.
  • the cleaning fluid is no longer reliably transported to the free end of an outlet can be discharged through which the pumped by the jet pump liquid.
  • a considerable suction flow can be generated not only in the area of the pump inlet channel but also in the region of one downstream of the one with a capture channel diameter of 14 mm to 18 mm Fangkanals arranged outlet, in particular an outlet hose.
  • This has the advantage that the cleaning liquid extracted from the surface to be cleaned can be discharged via the outlet line even if the outlet line has a certain inclination to the horizontal obliquely upward.
  • This gives the user the option of, for example, cleaning a patio, with the outlet duct running along a rising floor surface or, for example, overcoming a small garden wall.
  • the surface to be cleaned can therefore be effectively sucked off and the extracted cleaning liquid can be set by the jet pump under a considerable delivery pressure, so that it can be reliably dissipated.
  • the distance between the motive nozzle and the capture channel is in an advantageous embodiment of the invention a maximum of 60 mm.
  • a distance of 40 mm between the drive nozzle and the capture channel has been found to be particularly favorable to produce with a very low pressure of the drive nozzle supplied cleaning fluid and with the lowest possible flow rate of the cleaning liquid, a particularly effective suction flow for suction of the surface to be cleaned and To put the extracted liquid under a considerable delivery pressure, so that it can be reliably dissipated.
  • the distance between the motive nozzle and the capture channel is preferably 1.3 to 4.3 times the diameter of the capture channel.
  • the distance between the motive nozzle and the capture channel is at least 1.3 times the diameter of the capture channel.
  • the motive nozzle should not be immediately be arranged at the entrance of the catch channel.
  • the distance between the motive nozzle and the inlet of the capture channel should preferably not be greater than 4.3 times the diameter of the capture channel, since otherwise the suction flow is impaired.
  • the length of the catch channel is preferably at least 10 mm. In particular, a length of 20 mm has proven to be beneficial in order to increase the efficiency of the jet pump.
  • a diffuser connects to the capture channel with an opening angle of 4 ° to 12 °, in particular with an opening angle of 8 °.
  • the diffuser forms a subsequent to the capture channel line section, which expands continuously. As a result, the achievable suction flow can be improved.
  • the capture channel and the diffuser together have a length of at least 30 mm.
  • the ratio between the diameter of the capture channel to the common length of capture channel and diffuser is conveniently 0.13 to 0.25.
  • the motive nozzle is formed in a preferred embodiment of the invention as a cone jet nozzle, wherein the opening angle of the cone beam is 15 ° to 40 °. Conveniently, the opening angle of the cone beam is 20 ° to 25 °.
  • the housing has an outer wall which surrounds the peripheral wall of the cleaning chamber, wherein the pump inlet channel is held on the peripheral wall and on the outer wall.
  • the pump inlet channel protrudes beyond the outer wall to the outside.
  • the pump inlet channel thus runs at least partially within the housing, namely in the region between the peripheral wall of the cleaning chamber and the Outside wall of the housing.
  • the space of the surface cleaning head can be kept relatively low.
  • the pump inlet channel can protrude outward beyond the housing. This increases the stability not only of the pump inlet channel but also the portions of the outer wall and the peripheral wall adjoining the pump inlet channel.
  • the pump inlet channel forms a mechanical reinforcing element which increases the mechanical stability of the surface cleaning head.
  • At least three support elements are favorably arranged for supporting the surface cleaning head on the surface to be cleaned.
  • the support elements may for example be designed in the form of rollers or wheels, with the help of the surface cleaning head can be moved along the surface to be cleaned.
  • the peripheral wall of the cleaning chamber is preferably designed circular-cylindrical and the outer wall of the housing preferably has a triangular shape in plan view with rounded corner regions, wherein in each corner region a support element is arranged.
  • the support elements are thus covered by the housing, the surface cleaning head has a very compact overall design.
  • a pump outlet channel which defines the mixing chamber and the catching channel and possibly also the diffuser, is held on the end of the pump inlet channel facing away from the peripheral wall of the cleaning chamber.
  • the pump outlet channel is aligned coaxially with the pump inlet channel.
  • housing of the surface cleaning head, the pump inlet channel and the pump outlet channel are integrally connected to each other.
  • Housing, pump inlet and Pumpenauslasskanal are preferably designed as a one-piece plastic molding. The manufacturing and assembly costs of the surface cleaning head can be kept low.
  • a simplification of the assembly of the surface cleaning head is achieved in an advantageous embodiment in that the motive nozzle is held on an insertable into the pump inlet channel and mechanically connectable to the pump inlet channel nozzle holder.
  • the nozzle holder is preferably latched to the pump inlet channel.
  • the motive nozzle can be fixed to the nozzle holder, and then the nozzle holder can be inserted with the drive nozzle fixed thereto in the pump inlet channel and mechanically connected to this.
  • the nozzle holder is connected in an advantageous embodiment of the invention via a running within the cleaning chamber above the at least one spray arm second line section with a ceiling wall of the cleaning chamber by cross-first line section.
  • About the line sections of the fixed nozzle holder on the nozzle pressurized cleaning fluid can be supplied.
  • the surface cleaning head is characterized in such a configuration by a particularly compact design.
  • the surface cleaning head has a distributor unit which is connected via a first branch line to the at least one cleaning nozzle and via a second branch line to the motive nozzle, wherein a supply line is pivotably mounted on the distributor unit.
  • the spray lance of a high-pressure cleaning device can be connected to the supply line.
  • pressurized cleaning liquid can be supplied.
  • the first branch line is the distribution unit with the at least one Cleaning nozzle connected so that the surface to be cleaned can be sprayed with cleaning liquid
  • the second branch line the distributor unit is connected to the motive nozzle, so that the motive nozzle can be acted upon with pressurized cleaning liquid to form a suction flow.
  • the second branch line can have a first line section which passes through the top wall of the cleaning chamber, and a second line section, which adjoins the first line section and extends inside the housing as far as the nozzle holder of the drive nozzle.
  • the motive nozzle dips into the mixing chamber.
  • the mixing chamber tapers conically in the direction of the catching channel.
  • the mixing chamber is preferably frusto-conical and extends from the pump inlet channel to the capture channel.
  • the cone angle of the mixing chamber is preferably 20 ° to 50 °, in particular 25 ° to 35 °. A cone angle of 30 ° is of particular advantage.
  • the collecting channel is favorably cylindrical.
  • the pump inlet channel preferably also has a conical taper, that is, the flow cross section of the pump inlet channel decreases in the direction of the mixing chamber.
  • the pump inlet channel is wedge-shaped.
  • the pump inlet channel has two obliquely aligned side walls.
  • the side walls are preferably aligned at an angle of 90 ° to each other.
  • a connection device for connecting the outlet line is arranged downstream of the catching channel.
  • the pump outlet channel via the connection device with the outlet line is detachably connectable.
  • connection device connected to the outlet line with a connection diameter of 28 mm to 40 mm can be connected to the connection device.
  • the outlet conduit and the coupling device may preferably engage with each other.
  • the outlet line can engage in a tubular coupling element of the coupling device or be attached to this.
  • the invention also relates to a surface cleaning arrangement for cleaning a surface with a surface cleaning head, which is preferably configured as described above, and with an outlet line connected to the surface cleaning head, the surface cleaning head comprising a housing having a downwardly open cleaning space surrounded by a peripheral wall at least one cleaning nozzle is freely rotatably mounted on a spray arm about an axis of rotation for applying cleaning liquid to the surface to be cleaned, and wherein the surface cleaning head for sucking the cleaning liquid applied to the surface comprises a jet pump having a pump inlet channel in fluid communication with the cleaning chamber is connected via a mixing chamber with a collecting channel, wherein upstream of the collecting channel, a driving nozzle for forming a suction flow is arranged and downstream of the collecting channel at the surfaces cleaning head the outlet pipe is connected.
  • the longitudinal axis of the pump inlet channel is aligned radially with the axis of rotation of the at least one spray arm and the pump inlet channel adjoins the peripheral wall of the cleaning chamber, and Diameter of the catch channel is one third to two thirds of the inner diameter of the outlet pipe.
  • a surface cleaning arrangement according to the invention 5 is shown schematically with a surface cleaning head 10 according to the invention.
  • the surface cleaning head 10 has a hood-like housing 12, which is configured in the plan view substantially triangular with rounded corners.
  • the housing 12 comprises a ceiling wall 14, to whose Outside edge adjoins an outer wall 16.
  • At a distance from the outer wall 16 is from the ceiling wall 14 down from a circular cylindrical peripheral wall 18, which surrounds a cleaning chamber 20.
  • - each associated with a corner region of the housing 12 are - each associated with a corner region of the housing 12 - support elements in the form of support wheels 22, 23 and 24 are arranged with which the surface cleaning head 10 can be supported on a surface to be cleaned and with which the surface cleaning head 10 can be moved along the surface to be cleaned.
  • a circumferential splash guard and sealing element in the form of a bristle strip 26 is arranged, with the help of the cleaning chamber 20 sealed against the surface to be cleaned and the escape of spray water from the cleaning chamber 20 can be prevented.
  • a distributor unit 28 is arranged with a distribution line 29, whose longitudinal axis 30 is aligned perpendicular to the cylinder axis 31, which is defined by the cylindrical peripheral wall 18.
  • the distributor unit 28 forms a bearing element on which a supply line 33 is mounted pivotably about the longitudinal axis 30 of the distribution line 29.
  • the feed line 33 carries a connection element 34, to which, for example, a spray lance of a high-pressure cleaning device known per se and therefore not shown in the drawing can be connected.
  • the supply line 33 opens into the distribution line 29, which is aligned coaxially with the cylinder axis 31, a first branch line 36 connects, which dips into the cleaning chamber 20 and carries at its free end two diametrically opposed spray arms 37, 38. At their free end, the two spray arms 37 and 38 each carry a cleaning nozzle 39 or 40.
  • a cleaning nozzle 39 or 40 By means of the cleaning nozzles 39 and 40, a surface to be cleaned in the area which is surrounded by the bristle strips 26, with cleaning liquid be sprayed.
  • the cleaning nozzles 39 and 40 produce an obliquely downwardly directed liquid jet of a cleaning liquid, which exerts a torque on the spray arms 37, 38 upon exiting the cleaning nozzles 39, 40 and thereby cause them to rotate about the cylinder axis 31.
  • the distribution line 29 is in flow communication with a jet pump 45.
  • the latter comprises a motive nozzle 46 which is fixed to a nozzle holder 48.
  • the nozzle holder 48 is inserted into a pump inlet channel 50 and mechanically connected thereto.
  • the nozzle holder 48 is latched to the pump inlet channel 50.
  • the pump inlet channel 50 extends from a lateral opening 52 of the peripheral wall 18 with the longitudinal axis 53 aligned radially with respect to the cylinder axis 31 through the outer wall 16, that is to say the pump inlet channel 50 projects outwardly beyond the housing 12. This is especially true FIG. 4 clear.
  • a pump outlet channel 55 Integral to the pump inlet channel 50 is a pump outlet channel 55, which is aligned coaxially with the pump inlet channel 50 and carries a connection device at its free end.
  • the connection device comprises an annular space 61, which surrounds the pump outlet channel 55 at its free end region and is bounded on the outside by a sleeve 62.
  • the sleeve 62 is integrally connected to the pump outlet channel via a radially outwardly projecting shoulder 63.
  • a coupling device 57 is connected to the connection device.
  • the coupling device 57 comprises a coupling flange 58 with a central connection opening 59.
  • a first pipe socket 60 dips into the annular space 61 and is releasably connected to the sleeve 62, for example via a bayonet connection.
  • a coaxial with the longitudinal axis 53 aligned second pipe socket 64 is integrally formed on the coupling flange 58.
  • the second pipe socket 64 forms a tubular coupling element into which an outlet pipe in the form of a flexible outlet hose 76 is inserted.
  • the outlet hose 76 is permanently connected by means of an adhesive to the coupling device 57 and can separated from the pump discharge passage 55 together with the coupling device 57 and connected to it when necessary.
  • the inner diameter of the outlet tube 76 is conveniently identical to the diameter of the connection opening 59 and is preferably 28 mm to 40 mm.
  • the flow cross section of the pump inlet channel 50 decreases in the region between the lateral opening 52 and the pump outlet channel 55. For this purpose, it has two obliquely to each other, namely at an angle of 90 ° to each other aligned side walls 78, 79. This is going out FIG. 4 clear.
  • a mixing chamber 65 adjoins the pump inlet channel 50, which is embodied in the shape of a truncated cone and tapers conically in the direction away from the pump inlet channel 50 with a cone angle of 30 °.
  • Adjoining the mixing chamber 65 in the pump outlet channel 55 is a cylindrical catching channel 67 which has a diameter of 14 to 18 mm and a length of 40 mm.
  • the distance between the motive nozzle 46 and the capture channel 67 is at least 10 mm, in particular at least 15 mm and a maximum of 60 mm. In the illustrated embodiment, the distance is 40 mm.
  • a diffuser 69 which widens conically in the direction away from the pump inlet channel 50, adjoins the catching channel 67 in the direction away from the pump inlet channel 50, the cone angle of the diffuser 69 is 8 ° in the illustrated embodiment.
  • the connection opening 59 connects.
  • the motive nozzle 46 is held on the nozzle holder 48.
  • the motive nozzle 46 is aligned with the capture channel 67 and immersed with its free end in the mixing chamber 65 a.
  • This has a first line section 71 which of the distribution line 29 goes out and at a distance from the first branch line 36, the ceiling wall 14 of the housing 12 passes through.
  • a second line section 72 of the second branch line 43 adjoins the first line section 71 above the spray arms 37, 38, at the free end of which the nozzle holder 48 with the drive nozzle 46 is held.
  • the motive nozzle 46 is designed as a cone jet nozzle, that is, it emits a cone-shaped liquid jet, which is directed to the capture channel 67.
  • the opening angle of the cone beam is about 22 ° in the illustrated embodiment.
  • connection diameter of the coupling device 57 that is to say the diameter of the connection opening 59, as well as the inner diameter of the outlet hose 76 is 28 mm to 40 mm.
  • the ratio of the diameter of the catch channel 67 to the connection diameter of the coupling device 57 and thus to the inner diameter of the outlet tube 76 is one third to two thirds.
  • the jet of liquid emitted by the motive nozzle 46 strikes the capture channel 67 and generates, according to the known venturi principle, a suction flow directed into the pump inlet channel 50 and the subsequent pump outlet channel 55.
  • a suction flow directed into the pump inlet channel 50 and the subsequent pump outlet channel 55.
  • cleaning liquid which has been applied to the surface to be cleaned can be picked up from the surface together with cleaned dirt and discharged via the outlet hose 76.
  • the outlet hose 76 is detachably connected to the pump outlet passage 55. Within the outlet hose 76, under the action of the motive nozzle 46, a liquid flow is formed, which is directed in the direction away from the surface cleaning head 10. Suction cleaning liquid flows through the outlet hose 76 even if it overcomes a certain slope.
  • the surface cleaning head 10 is also characterized by a high mechanical stability.
  • the cleaning nozzles 39, 40 are arranged as well as the driving nozzle 46 within the housing 12 and also the second line section 72 of the second branch line 43 extends within the housing 12 and is thereby protected from mechanical damage.
  • the pump inlet passage 50 is fixed to both the peripheral wall 18 and the outer wall 16 and forms a stable anchorage for the pump outlet passage 55.
  • the housing 12 having the peripheral wall 18 and the outer wall 16 forms a one-piece in combination with the pump inlet passage 50 and the pump outlet passage 55 Plastic molding, which has a high mechanical stability and is inexpensive to produce.
  • the nozzle holder 48 can be inserted through the lateral opening 52 of the peripheral wall 18 into the pump inlet channel 50 and locked with this after previously the drive nozzle 46 has been fixed to the nozzle holder 48.

Description

Die Erfindung betrifft einen Flächenreinigungskopf zur Reinigung einer Fläche, mit einem Gehäuse, das einen von einer Umfangswand umgebenen, nach unten offenen Reinigungsraum aufweist, in dem zumindest eine Reinigungsdüse an einem Sprüharm um eine Drehachse frei drehbar gelagert ist zum Aufbringen von Reinigungsflüssigkeit auf die zu reinigende Fläche, und mit einer Strahlpumpe zum Absaugen von auf die Fläche aufgebrachter Reinigungsflüssigkeit, wobei die Strahlpumpe einen mit dem Reinigungsraum in Strömungsverbindung stehenden Pumpeneinlasskanal aufweist, der sich an die Umfangswand des Reinigungsraumes anschließt und über eine Mischkammer mit einem Fangkanal verbunden ist, wobei stromaufwärts des Fangkanals eine Treibdüse zur Ausbildung einer Saugströmung angeordnet ist.The invention relates to a surface cleaning head for cleaning a surface, having a housing which has a cleaning chamber surrounded by a peripheral wall, downwardly open cleaning space in which at least one cleaning nozzle is freely rotatably mounted on a spray arm about a rotation axis for applying cleaning liquid to be cleaned Surface, and with a jet pump for sucking on the surface of applied cleaning liquid, the jet pump having a communicating with the cleaning chamber in fluid communication pump inlet channel, which adjoins the peripheral wall of the cleaning chamber and is connected via a mixing chamber with a collecting channel, upstream of the collecting channel a motive nozzle is arranged to form a suction flow.

Ein Flächenreinigungskopf ist aus der US 4,895,179 bekannt. An den Flächenreinigungskopf kann eine Sprühlanze eines Hochdruckreinigungsgerätes angeschlossen werden, so dass der am Sprüharm angeordneten Reinigungsdüse vom Hochdruckreinigungsgerät unter Druck gesetzte Reinigungsflüssigkeit zugeführt werden kann. Mittels der Reinigungsdüse kann die Reinigungsflüssigkeit auf die zu reinigende Fläche gesprüht werden. Die Düse erfährt hierbei einen Rückstoß, so dass der Sprüharm um die Drehachse in Drehung versetzt wird. Üblicherweise kommen mindestens zwei einander diametral gegenüberliegende Sprüharme zum Einsatz, die jeweils eine Reinigungsdüse tragen, wobei die Düsen gleichzeitig mit unter Druck stehender Reinigungsflüssigkeit beaufschlagbar sind.A surface cleaning head is from the US 4,895,179 known. A spray lance of a high-pressure cleaning device can be connected to the surface cleaning head so that the cleaning nozzle arranged on the spray arm can be supplied with pressurized cleaning fluid from the high-pressure cleaning device. By means of the cleaning nozzle, the cleaning liquid can be sprayed onto the surface to be cleaned. The nozzle experiences a recoil, so that the spray arm is rotated about the axis of rotation. Usually, at least two diametrically opposite spray arms are used, each carrying a cleaning nozzle, wherein the nozzles are acted upon simultaneously with pressurized cleaning liquid.

Zusätzlich zu den Reinigungsdüsen weist der bekannte Flächenreinigungskopf eine Strahlpumpe auf, die nach dem Prinzip einer Venturipumpe arbeitet. Die Strahlpumpe ist oberhalb des Gehäuses angeordnet und steht über eine seitlich am Reinigungsraum entlang führende Verbindungsleitung mit dem Reinigungsraum in Strömungsverbindung. Die Strahlpumpe umfasst einen Pumpeneinlasskanal, an den sich eine Mischkammer und dieser nachfolgend ein Fangkanal anschließen. Stromaufwärts des Fangkanals ist fluchtend zum Fangkanal eine Treibdüse angeordnet, die mit unter Druck stehender Reinigungsflüssigkeit beaufschlagt werden kann und dadurch in der Mischkammer und dem Fangkanal eine Saugströmung ausbildet. An den Fangkanal schließt sich ein Diffusor an. An den Diffusor kann eine Auslassleitung angeschlossen werden. Die von der Treibdüse erzeugte Saugströmung ermöglicht es, die auf die zu reinigende Fläche aufgebrachte Flüssigkeit zusammen mit abgereinigtem Schmutz aufzusaugen und über die Auslassleitung abzugeben.In addition to the cleaning nozzles, the known surface cleaning head on a jet pump, which operates on the principle of a Venturi pump. The jet pump is arranged above the housing and is in fluid communication with the cleaning space via a connection line leading laterally along the cleaning space. The jet pump comprises a pump inlet channel, to which a mixing chamber and this followed by a capture channel. Upstream of the catch channel a drive nozzle is arranged in alignment with the catch channel, which can be acted upon with pressurized cleaning liquid and thereby forms a suction flow in the mixing chamber and the catch channel. The catching channel is followed by a diffuser. An outlet pipe can be connected to the diffuser. The suction flow generated by the motive nozzle makes it possible to absorb the liquid applied to the surface to be cleaned together with cleaned dirt and to dispense it via the outlet conduit.

Zum Betrieb des aus der US 4,895,179 bekannten Flächenreinigungskopfes wird diesem die Reinigungsflüssigkeit unter einem Druck von mindestens 207 bar zugeführt mit einer Förderleistung von mindestens 1.620 Liter pro Stunde. Aufgrund des hohen Druckes der Reinigungsflüssigkeit und der hohen Förderleistung lässt sich mittels der Strahlpumpe eine ausreichend starke Saugströmung ausbilden, so dass die auf die zu reinigende Fläche aufgebrachte Reinigungsflüssigkeit wirkungsvoll abgesaugt werden kann.To operate from the US 4,895,179 known surface cleaning head this is supplied to the cleaning liquid under a pressure of at least 207 bar with a capacity of at least 1,620 liters per hour. Due to the high pressure of the cleaning liquid and the high delivery rate, a sufficiently strong suction flow can be formed by means of the jet pump, so that the cleaning liquid applied to the surface to be cleaned can be effectively sucked off.

Flächenreinigungsköpfe mit mindestens einer rotierenden Reinigungsdüse, der unter Druck stehende Reinigungsflüssigkeit zugeführt werden kann, und mit einer Strahlpumpe zum Absaugen von auf die Fläche aufgebrachter Reinigungsflüssigkeit sind auch aus der DE 100 66 009 B4 und der DE 103 13 396 B4 bekannt. Auch bei diesen Flächenreinigungsköpfen erfolgt die Zuführung der Reinigungsflüssigkeit zur Treibdüse unter einem hohen Druck und mit hoher Förderleistung.Surface cleaning heads with at least one rotating cleaning nozzle, the pressurized cleaning liquid can be supplied, and with a jet pump for sucking applied to the surface cleaning liquid are also from the DE 100 66 009 B4 and the DE 103 13 396 B4 known. Also in these surface cleaning heads, the supply of cleaning fluid to the motive nozzle is carried out under a high pressure and high flow rate.

Aus der DE 100 37 082 A1 ist ein Flächenreinigungskopf mit den Merkmalen des Oberbegriffes von Patentanspruch 1 bekannt. Er weist eine Strahlpumpe auf, deren Pumpeneinlasskanal als flexible Leitung ausgebildet ist, die sich an die Umfangswand des Reinigungsraums anschließt und schräg zur Vertikalen ausgerichtet ist.From the DE 100 37 082 A1 a surface cleaning head having the features of the preamble of claim 1 is known. He has a jet pump on, the pump inlet channel is designed as a flexible conduit which adjoins the peripheral wall of the cleaning chamber and is oriented obliquely to the vertical.

Aus der WO 2005/028132 A1 ist ein Hochdruckreinigungsgerät bekannt mit einem Schaumerzeugungssystem, bei dem ein Injektor zum Einsatz kommt. Mit Hilfe des Injektors kann einer Reinigungsflüssigkeit eine Chemikalie beigemischt werden. Der Injektor weist einen Eingang und einen Ausgang auf, die über eine den Injektor durchgreifende Reinigungsmittelleitung miteinander verbunden sind. In die Reinigungsmittelleitung mündet eine Chemikalienleitung senkrecht ein. Stromaufwärts des Mündungsbereichs bildet die Reinigungsmittelleitung einen zylinderförmigen Treibkanal, der über einen konusförmigen Endabschnitt in den Mündungsbereich einmündet und dem stromaufwärts ein sich in Strömungsrichtung kontinuierlich verjüngender Zuleitungskanal vorgelagert ist. Stromabwärts des Mündungsbereichs bildet die Reinigungsmittelleitung einen zylinderförmigen Fangkanal, der in Strömungsrichtung etwa die 6-fache Länge des Treibkanals aufweist und dessen Durchmesser etwa das 1,25-fache des Durchmessers des Treibkanals beträgt. An den Fangkanal schließt sich in Strömungsrichtung ein Auslasskanal an mit einem ersten Auslassabschnitt, der sich in Strömungsrichtung mit einem Konuswinkel von etwa 10° konisch erweitert, und mit einem zweiten Auslassabschnitt, der sich mit einem Konuswinkel von etwa 60° bis zum Ausgang des Injektors konisch erweitert.From the WO 2005/028132 A1 is a high-pressure cleaner known with a foam generation system in which an injector is used. With the help of the injector, a cleaning liquid can be mixed with a chemical. The injector has an inlet and an outlet, which are connected to one another via a detergent line passing through the injector. A chemical line opens vertically into the detergent line. Upstream of the mouth region, the cleaning agent line forms a cylindrical drive channel, which opens into the mouth region via a conical end section and upstream of which a feed channel, which continuously tapers in the flow direction, is arranged upstream. Downstream of the mouth region, the cleaning agent line forms a cylindrical collecting channel, which has approximately 6 times the length of the driving channel in the flow direction and whose diameter is approximately 1.25 times the diameter of the driving channel. An outlet channel adjoins the capture channel in the flow direction, with a first outlet section, which widens conically in the flow direction with a cone angle of approximately 10 °, and with a second outlet section, which conically tapers with a cone angle of approximately 60 ° up to the exit of the injector extended.

Aufgabe der vorliegenden Erfindung ist es, einen gattungsgemäßen Flächenreinigungskopf derart weiterzubilden, dass der Druck und die Förderleistung der Reinigungsflüssigkeit ohne erhebliche Einbußen an Saugkraft der Saugpumpe reduziert werden können.Object of the present invention is to develop a generic surface cleaning head such that the pressure and flow rate of the cleaning fluid can be reduced without significant loss of suction of the suction pump.

Diese Aufgabe wird bei einem Flächenreinigungskopf der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass der Durchmesser des Fangkanals 14 mm bis 18 mm beträgt und dass der Abstand zwischen der Treibdüse und dem Fangkanal mindestens 10 mm beträgt.This object is achieved in a surface cleaning head of the type mentioned in the present invention that the diameter of the catch channel is 14 mm to 18 mm and the distance between the motive nozzle and the collecting channel is at least 10 mm.

Beim erfindungsgemäßen Flächenreinigungskopf schließt sich der Pumpeneinlasskanal mit in radialer Richtung ausgerichteter Längsachse an den Reinigungsraum an. Der Pumpeneinlasskanal ist über die Mischkammer mit dem Fangkanal verbunden und stromaufwärts des Fangkanals ist die Treibdüse angeordnet. Die Mischkammer ist somit ebenso wie die Treibdüse in kurzem Abstand zum Reinigungsraum und damit auch in kurzem Abstand zu der zu reinigenden Fläche angeordnet. Dies hat zur Folge, dass sich im Reinigungsraum eine wirkungsvolle Saugströmung ausbildet, mit deren Hilfe die zu reinigende Fläche abgesaugt werden kann, wobei der Druck der der Treibdüse zugeführten Reinigungsflüssigkeit geringer gewählt werden kann als bei dem Flächenreinigungskopf, der aus der US 4,895,179 bekannt ist. Beispielsweise kann der Druck der der Treibdüse zugeführten Reinigungsflüssigkeit weniger als 150 bar betragen und die Förderleistung kann weniger als 800 Liter pro Stunde betragen, insbesondere weniger als 600 Liter pro Stunde.In the surface cleaning head according to the invention, the pump inlet channel connects with aligned in the radial direction of the longitudinal axis of the cleaning chamber. The pump inlet channel is connected via the mixing chamber with the capture channel and upstream of the capture channel, the motive nozzle is arranged. The mixing chamber is thus arranged as well as the motive nozzle at a short distance to the cleaning room and thus at a short distance to the surface to be cleaned. This has the consequence that an effective suction flow is formed in the cleaning room, with the aid of which the surface to be cleaned can be sucked off, wherein the pressure of the drive nozzle supplied cleaning fluid can be selected smaller than in the surface cleaning head, from the US 4,895,179 is known. For example, the pressure of the cleaning fluid supplied to the motive nozzle may be less than 150 bar and the delivery rate may be less than 800 liters per hour, in particular less than 600 liters per hour.

Eine weitere Steigerung der Effektivität des Flächenreinigungskopfes wird erfindungsgemäß dadurch erzielt, dass der Durchmesser des Fangkanals 14 mm bis 18 mm beträgt. Bei kleineren Fangkanaldurchmessern bildet sich zwar am Ausgang des Fangkanals ein beachtlicher Förderdruck aus, allerdings ist der Luftdurchlass durch den Fangkanal verhältnismäßig gering. Bei großen Durchmessern ergibt sich ein hoher Luftdurchlass, allerdings bildet sich dann am Ausgang des Fangkanals nur noch ein verhältnismäßig geringer Förderdruck aus, so dass die Gefahr besteht, dass die Reinigungsflüssigkeit nicht mehr zuverlässig bis an das freie Ende einer Auslassleitung transportiert werden kann, über die die von der Strahlpumpe geförderte Flüssigkeit abgegeben wird. In Kombination mit einem Abstand zwischen Treibdüse und Fangkanal von mindestens 10 mm, insbesondere einem Abstand von mindestens 15 mm, kann bei einem Fangkanaldurchmesser von 14 mm bis 18 mm nicht nur im Bereich des Pumpeneinlasskanals eine beachtliche Saugströmung erzeugt werden sondern auch im Bereich einer stromabwärts der Fangkanals angeordneten Auslassleitung, insbesondere einem Auslassschlauch. Dies hat den Vorteil, dass die von der zu reinigenden Fläche abgesaugte Reinigungsflüssigkeit über die Auslassleitung selbst dann abgeführt werden kann, wenn die Auslassleitung eine gewisse Neigung zur Horizontalen schräg nach oben aufweist. Dies gibt dem Benutzer die Möglichkeit, beispielsweise eine Terrasse zu reinigen, wobei die Auslassleitung entlang einer ansteigenden Bodenfläche verläuft oder beispielsweise eine kleine Gartenmauer überwindet. Die zu reinigende Fläche kann folglich wirkungsvoll abgesaugt werden und die abgesaugte Reinigungsflüssigkeit kann von der Strahlpumpe unter einen beachtlichen Förderdruck gesetzt werden, so dass sie zuverlässig abgeführt werden kann.A further increase in the effectiveness of the surface cleaning head is inventively achieved in that the diameter of the catch channel is 14 mm to 18 mm. For smaller catch channel diameters, although a considerable delivery pressure is formed at the outlet of the catch channel, the air passage through the catch channel is relatively small. For large diameters results in a high air passage, but then forms at the output of the catch channel only a relatively low discharge pressure, so that there is a risk that the cleaning fluid is no longer reliably transported to the free end of an outlet can be discharged through which the pumped by the jet pump liquid. In combination with a distance between the motive nozzle and the capture channel of at least 10 mm, in particular a distance of at least 15 mm, a considerable suction flow can be generated not only in the area of the pump inlet channel but also in the region of one downstream of the one with a capture channel diameter of 14 mm to 18 mm Fangkanals arranged outlet, in particular an outlet hose. This has the advantage that the cleaning liquid extracted from the surface to be cleaned can be discharged via the outlet line even if the outlet line has a certain inclination to the horizontal obliquely upward. This gives the user the option of, for example, cleaning a patio, with the outlet duct running along a rising floor surface or, for example, overcoming a small garden wall. The surface to be cleaned can therefore be effectively sucked off and the extracted cleaning liquid can be set by the jet pump under a considerable delivery pressure, so that it can be reliably dissipated.

Der Abstand zwischen der Treibdüse und dem Fangkanal beträgt bei einer vorteilhaften Ausführungsform der Erfindung maximal 60 mm.The distance between the motive nozzle and the capture channel is in an advantageous embodiment of the invention a maximum of 60 mm.

Insbesondere ein Abstand von 40 mm zwischen der Treibdüse und dem Fangkanal hat sich als besonders günstig erwiesen, um mit einem möglichst geringen Druck der der Treibdüse zugeführten Reinigungsflüssigkeit und mit möglichst geringer Förderleistung der Reinigungsflüssigkeit eine besonders wirksame Saugströmung zum Absaugen der zu reinigenden Fläche zu erzeugen und die abgesaugte Flüssigkeit unter einen beachtlichen Förderdruck zu setzen, so dass sie zuverlässig abgeführt werden kann.In particular, a distance of 40 mm between the drive nozzle and the capture channel has been found to be particularly favorable to produce with a very low pressure of the drive nozzle supplied cleaning fluid and with the lowest possible flow rate of the cleaning liquid, a particularly effective suction flow for suction of the surface to be cleaned and To put the extracted liquid under a considerable delivery pressure, so that it can be reliably dissipated.

Der Abstand zwischen der Treibdüse und dem Fangkanal beträgt vorzugsweise das 1,3- bis 4,3-fache des Durchmessers des Fangkanals. Zur Ausbildung einer wirkungsvollen Saugströmung ist es von Vorteil, wenn der Abstand zwischen der Treibdüse und dem Fangkanal mindestens das 1,3-fache des Durchmessers des Fangkanals beträgt. Die Treibdüse sollte also nicht unmittelbar am Eingang des Fangkanals angeordnet sein. Andererseits sollte der Abstand zwischen der Treibdüse und dem Eingang des Fangkanals vorzugsweise auch nicht größer sein als das 4,3-fache des Durchmessers des Fangkanals, da ansonsten die Saugströmung beeinträchtigt wird.The distance between the motive nozzle and the capture channel is preferably 1.3 to 4.3 times the diameter of the capture channel. To form an effective suction flow, it is advantageous if the distance between the motive nozzle and the capture channel is at least 1.3 times the diameter of the capture channel. The motive nozzle should not be immediately be arranged at the entrance of the catch channel. On the other hand, the distance between the motive nozzle and the inlet of the capture channel should preferably not be greater than 4.3 times the diameter of the capture channel, since otherwise the suction flow is impaired.

Die Länge des Fangkanals beträgt bevorzugt mindestens 10 mm. Insbesondere eine Länge von 20 mm hat sich als günstig erwiesen, um die Wirksamkeit der Strahlpumpe zu steigern.The length of the catch channel is preferably at least 10 mm. In particular, a length of 20 mm has proven to be beneficial in order to increase the efficiency of the jet pump.

Von Vorteil ist es, wenn sich an den Fangkanal ein Diffusor anschließt mit einem Öffnungswinkel von 4° bis 12°, insbesondere mit einem Öffnungswinkel von 8°. Der Diffusor bildet einen sich an den Fangkanal anschließenden Leitungsabschnitt, der sich kontinuierlich erweitert. Dadurch kann die erzielbare Saugströmung verbessert werden.It is advantageous if a diffuser connects to the capture channel with an opening angle of 4 ° to 12 °, in particular with an opening angle of 8 °. The diffuser forms a subsequent to the capture channel line section, which expands continuously. As a result, the achievable suction flow can be improved.

Günstigerweise haben der Fangkanal und der Diffusor gemeinsam eine Länge von mindestens 30 mm.Conveniently, the capture channel and the diffuser together have a length of at least 30 mm.

Das Verhältnis zwischen dem Durchmesser des Fangkanals zur gemeinsamen Länge von Fangkanal und Diffusor beträgt günstigerweise 0,13 bis 0,25.The ratio between the diameter of the capture channel to the common length of capture channel and diffuser is conveniently 0.13 to 0.25.

Die Treibdüse ist bei einer bevorzugten Ausgestaltung der Erfindung als Kegelstrahldüse ausgebildet, wobei der Öffnungswinkel des Kegelstrahls 15° bis 40° beträgt. Günstigerweise beträgt der Öffnungswinkel des Kegelstrahls 20° bis 25°.The motive nozzle is formed in a preferred embodiment of the invention as a cone jet nozzle, wherein the opening angle of the cone beam is 15 ° to 40 °. Conveniently, the opening angle of the cone beam is 20 ° to 25 °.

Bei einer besonders bevorzugten Ausgestaltung der Erfindung weist das Gehäuse eine Außenwand auf, die die Umfangswand des Reinigungsraums umgibt, wobei der Pumpeneinlasskanal an der Umfangswand und an der Außenwand gehalten ist. Insbesondere kann vorgesehen sein, dass der Pumpeneinlasskanal über die Außenwand nach außen hervorsteht. Der Pumpeneinlasskanal verläuft somit zumindest teilweise innerhalb des Gehäuses, nämlich im Bereich zwischen der Umfangswand des Reinigungsraums und der Außenwand des Gehäuses. Dadurch kann der Bauraum des Flächenreinigungskopfes verhältnismäßig gering gehalten werden. Mit seinem dem Reinigungsraum abgewandten Endbereich kann der Pumpeneinlasskanal nach außen über das Gehäuse hervorstehen. Dies erhöht die Stabilität nicht nur des Pumpeneinlasskanals sondern auch der an den Pumpeneinlasskanal anschließenden Abschnitte der Außenwand und der Umfangswand. Der Pumpeneinlasskanal hat somit nicht nur die Funktion, eine Strömungsverbindung herzustellen zwischen dem Reinigungsraum und der Mischkammer der Strahlpumpe, sondern zusätzlich bildet der Pumpeneinlasskanal ein mechanisches Verstärkungselement, das die mechanische Stabilität des Flächenreinigungskopfes erhöht.In a particularly preferred embodiment of the invention, the housing has an outer wall which surrounds the peripheral wall of the cleaning chamber, wherein the pump inlet channel is held on the peripheral wall and on the outer wall. In particular, it can be provided that the pump inlet channel protrudes beyond the outer wall to the outside. The pump inlet channel thus runs at least partially within the housing, namely in the region between the peripheral wall of the cleaning chamber and the Outside wall of the housing. As a result, the space of the surface cleaning head can be kept relatively low. With its end region facing away from the cleaning chamber, the pump inlet channel can protrude outward beyond the housing. This increases the stability not only of the pump inlet channel but also the portions of the outer wall and the peripheral wall adjoining the pump inlet channel. Thus, not only does the pump inlet channel function to establish a flow connection between the cleaning space and the mixing chamber of the jet pump, but in addition the pump inlet channel forms a mechanical reinforcing element which increases the mechanical stability of the surface cleaning head.

Im Bereich zwischen der Umfangswand des Reinigungsraums und der Außenwand des Gehäuses sind günstigerweise mindestens drei Stützelemente angeordnet zum Abstützen des Flächenreinigungskopfes an der zu reinigenden Fläche. Die Stützelemente können beispielsweise in Form von Laufrollen oder Laufrädern ausgestaltet sein, mit deren Hilfe der Flächenreinigungskopf an der zu reinigenden Fläche entlang verfahren werden kann.In the area between the peripheral wall of the cleaning chamber and the outer wall of the housing, at least three support elements are favorably arranged for supporting the surface cleaning head on the surface to be cleaned. The support elements may for example be designed in the form of rollers or wheels, with the help of the surface cleaning head can be moved along the surface to be cleaned.

Die Umfangswand des Reinigungsraums ist bevorzugt kreiszylindrisch ausgestaltet und die Außenwand des Gehäuses weist in der Draufsicht bevorzugt eine dreieckförmige Gestalt auf mit abgerundeten Eckbereichen, wobei in jedem Eckbereich ein Stützelement angeordnet ist. Die Stützelemente werden somit vom Gehäuse überdeckt, der Flächenreinigungskopf weist insgesamt eine sehr kompakte Bauform auf.The peripheral wall of the cleaning chamber is preferably designed circular-cylindrical and the outer wall of the housing preferably has a triangular shape in plan view with rounded corner regions, wherein in each corner region a support element is arranged. The support elements are thus covered by the housing, the surface cleaning head has a very compact overall design.

Günstig ist es, wenn an dem der Umfangswand des Reinigungsraums abgewandten Ende des Pumpeneinlasskanals ein Pumpenauslasskanal gehalten ist, der die Mischkammer und den Fangkanal und gegebenenfalls auch den Diffusor definiert. Bevorzugt ist der Pumpenauslasskanal koaxial zum Pumpeneinlasskanal ausgerichtet.It is advantageous if a pump outlet channel, which defines the mixing chamber and the catching channel and possibly also the diffuser, is held on the end of the pump inlet channel facing away from the peripheral wall of the cleaning chamber. Preferably, the pump outlet channel is aligned coaxially with the pump inlet channel.

Von Vorteil ist es, wenn das Gehäuse des Flächenreinigungskopfes, der Pumpeneinlasskanal und der Pumpenauslasskanal einteilig miteinander verbunden sind. Gehäuse, Pumpeneinlass- und Pumpenauslasskanal sind bevorzugt als einteiliges Kunststoffformteil ausgestaltet. Die Herstellungs- und Montagekosten des Flächenreinigungskopfes können dadurch gering gehalten werden.It is advantageous if the housing of the surface cleaning head, the pump inlet channel and the pump outlet channel are integrally connected to each other. Housing, pump inlet and Pumpenauslasskanal are preferably designed as a one-piece plastic molding. The manufacturing and assembly costs of the surface cleaning head can be kept low.

Eine Vereinfachung der Montage des Flächenreinigungskopfes wird bei einer vorteilhaften Ausführungsform dadurch erzielt, dass die Treibdüse an einer in den Pumpeneinlasskanal einsetzbaren und mit dem Pumpeneinlasskanal mechanisch verbindbaren Düsenhalterung gehalten ist. Die Düsenhalterung ist mit dem Pumpeneinlasskanal bevorzugt verrastbar. In einem ersten Montageschritt kann die Treibdüse an der Düsenhalterung festgelegt werden, und anschließend kann die Düsenhalterung mit der daran festgelegten Treibdüse in den Pumpeneinlasskanal eingesetzt und mit diesem mechanisch verbunden werden.A simplification of the assembly of the surface cleaning head is achieved in an advantageous embodiment in that the motive nozzle is held on an insertable into the pump inlet channel and mechanically connectable to the pump inlet channel nozzle holder. The nozzle holder is preferably latched to the pump inlet channel. In a first assembly step, the motive nozzle can be fixed to the nozzle holder, and then the nozzle holder can be inserted with the drive nozzle fixed thereto in the pump inlet channel and mechanically connected to this.

Die Düsenhalterung ist bei einer vorteilhaften Ausführungsform der Erfindung über einen innerhalb des Reinigungsraums oberhalb des mindestens einen Sprüharms verlaufenden zweiten Leitungsabschnitt mit einem eine Deckenwand des Reinigungsraums durchgreifenden ersten Leitungsabschnitt verbunden. Über die Leitungsabschnitte kann der an der Düsenhalterung festgelegten Treibdüse unter Druck stehende Reinigungsflüssigkeit zugeführt werden. Der Flächenreinigungskopf zeichnet sich bei einer derartigen Ausgestaltung durch eine besonders kompakte Bauform aus.The nozzle holder is connected in an advantageous embodiment of the invention via a running within the cleaning chamber above the at least one spray arm second line section with a ceiling wall of the cleaning chamber by cross-first line section. About the line sections of the fixed nozzle holder on the nozzle pressurized cleaning fluid can be supplied. The surface cleaning head is characterized in such a configuration by a particularly compact design.

Von Vorteil ist es, wenn der Flächenreinigungskopf eine Verteilereinheit aufweist, die über eine erste Zweigleitung mit der mindestens einen Reinigungsdüse und über eine zweite Zweigleitung mit der Treibdüse verbunden ist, wobei an der Verteilereinheit eine Zuleitung verschwenkbar gelagert ist. An die Zuleitung kann beispielsweise die Sprühlanze eines Hochdruckreinigungsgerätes angeschlossen werden. Über die Sprühlanze und die Zuleitung kann der Verteilereinheit unter Druck stehende Reinigungsflüssigkeit zugeführt werden. Über die erste Zweigleitung ist die Verteilereinheit mit der mindestens einen Reinigungsdüse verbunden, so dass die zu reinigende Fläche mit Reinigungsflüssigkeit besprüht werden kann, und über die zweite Zweigleitung ist die Verteilereinheit mit der Treibdüse verbunden, so dass die Treibdüse mit unter Druck stehender Reinigungsflüssigkeit beaufschlagt werden kann zur Ausbildung einer Saugströmung. Die zweite Zweigleitung kann hierbei, wie bereit erwähnt, einen ersten Leitungsabschnitt aufweisen, der die Deckenwand des Reinigungsraums durchgreift, sowie einen zweiten Leitungsabschnitt, der sich an den ersten Leitungsabschnitt anschließt und sich innerhalb des Gehäuses bis zur Düsenhalterung der Treibdüse erstreckt.It is advantageous if the surface cleaning head has a distributor unit which is connected via a first branch line to the at least one cleaning nozzle and via a second branch line to the motive nozzle, wherein a supply line is pivotably mounted on the distributor unit. For example, the spray lance of a high-pressure cleaning device can be connected to the supply line. About the spray lance and the supply line of the distribution unit pressurized cleaning liquid can be supplied. About the first branch line is the distribution unit with the at least one Cleaning nozzle connected so that the surface to be cleaned can be sprayed with cleaning liquid, and the second branch line, the distributor unit is connected to the motive nozzle, so that the motive nozzle can be acted upon with pressurized cleaning liquid to form a suction flow. As already mentioned, the second branch line can have a first line section which passes through the top wall of the cleaning chamber, and a second line section, which adjoins the first line section and extends inside the housing as far as the nozzle holder of the drive nozzle.

Günstigerweise taucht die Treibdüse in die Mischkammer ein.Conveniently, the motive nozzle dips into the mixing chamber.

Von Vorteil ist es, wenn sich die Mischkammer in Richtung des Fangkanals konisch verjüngt. Die Mischkammer ist vorzugsweise kegelstumpfförmig ausgebildet und erstreckt sich vom Pumpeneinlasskanal bis zum Fangkanal. Der Kegelwinkel der Mischkammer beträgt bevorzugt 20° bis 50°, insbesondere 25° bis 35°. Ein Kegelwinkel von 30° ist von besonderem Vorteil.It is advantageous if the mixing chamber tapers conically in the direction of the catching channel. The mixing chamber is preferably frusto-conical and extends from the pump inlet channel to the capture channel. The cone angle of the mixing chamber is preferably 20 ° to 50 °, in particular 25 ° to 35 °. A cone angle of 30 ° is of particular advantage.

Der Fangkanal ist günstigerweise zylindrisch ausgestaltet.The collecting channel is favorably cylindrical.

Der Pumpeneinlasskanal weist bevorzugt ebenfalls eine konische Verjüngung auf, das heißt der Strömungsquerschnitt des Pumpeneinlasskanals verringert sich in Richtung der Mischkammer.The pump inlet channel preferably also has a conical taper, that is, the flow cross section of the pump inlet channel decreases in the direction of the mixing chamber.

Günstigerweise ist der Pumpeneinlasskanal keilförmig ausgebildet.Conveniently, the pump inlet channel is wedge-shaped.

Bei einer vorteilhaften Ausführungsform weist der Pumpeneinlasskanal zwei schräg zueinander ausgerichtete Seitenwände auf. Die Seitenwände sind bevorzugt in einem Winkel von 90° zueinander ausgerichtet.In an advantageous embodiment, the pump inlet channel has two obliquely aligned side walls. The side walls are preferably aligned at an angle of 90 ° to each other.

Günstigerweise ist stromabwärts des Fangkanals eine Anschlusseinrichtung zum Anschluss der Auslassleitung angeordnet. Insbesondere kann vorgesehen sein, dass der Pumpenauslasskanal über die Anschlusseinrichtung mit der Auslassleitung lösbar verbindbar ist.Conveniently, a connection device for connecting the outlet line is arranged downstream of the catching channel. In particular, can be provided be that the pump outlet channel via the connection device with the outlet line is detachably connectable.

Von Vorteil ist es, wenn an die Anschlusseinrichtung eine mit der Auslassleitung verbundene Kupplungsvorrichtung mit einem Anschlussdurchmesser von 28 mm bis 40 mm anschließbar ist. Dadurch können Druckverluste beim Ausgeben der abgesaugten Flüssigkeit gering gehalten werden, und dennoch kann sich eine beachtliche Strömungsgeschwindigkeit ausbilden. Die Auslassleitung und die Kupplungsvorrichtung können bevorzugt ineinander greifen. Beispielsweise kann die Auslassleitung in ein rohrförmiges Kupplungselement der Kupplungsvorrichtung eingreifen oder auf dieses aufgesteckt werden.It is advantageous if a connection device connected to the outlet line with a connection diameter of 28 mm to 40 mm can be connected to the connection device. As a result, pressure losses when dispensing the extracted liquid can be kept low, and yet can form a considerable flow rate. The outlet conduit and the coupling device may preferably engage with each other. For example, the outlet line can engage in a tubular coupling element of the coupling device or be attached to this.

Die Erfindung betrifft auch eine Flächenreinigungsanordnung zur Reinigung einer Fläche mit einem Flächenreinigungskopf, der vorzugsweise wie voranstehend beschrieben ausgestaltet ist, und mit einer an den Flächenreinigungskopf angeschlossenen Auslassleitung, wobei der Flächenreinigungskopf ein Gehäuse umfasst mit einem von einer Umfangswand umgebenen, nach unten offenen Reinigungsraum, in dem zumindest eine Reinigungsdüse an einem Sprüharm um eine Drehachse frei drehbar gelagert ist zum Aufbringen von Reinigungsflüssigkeit auf die zu reinigende Fläche, und wobei der Flächenreinigungskopf zum Absaugen von auf die Fläche aufgebrachter Reinigungsflüssigkeit eine Strahlpumpe umfasst mit einem mit dem Reinigungsraum in Strömungsverbindung stehenden Pumpeneinlasskanal, der über eine Mischkammer mit einem Fangkanal verbunden ist, wobei stromaufwärts des Fangkanals eine Treibdüse zur Ausbildung einer Saugströmung angeordnet ist und stromabwärts des Fangkanals an den Flächenreinigungskopf die Auslassleitung angeschlossen ist. Um den Druck und die Förderleistung der der Flächenreinigungsanordnung zugeführten Reinigungsflüssigkeit reduzieren zu können, ohne die Saugkraft der Strahlpumpe zu beeinträchtigen, ist die Längsachse des Pumpeneinlasskanals radial zur Drehachse des mindestens einen Sprüharms ausgerichtet und der Pumpeneinlasskanal schließt sich an die Umfangswand des Reinigungsraums an, und der Durchmesser des Fangkanals beträgt ein Drittel bis zwei Drittel des Innendurchmessers der Auslassleitung.The invention also relates to a surface cleaning arrangement for cleaning a surface with a surface cleaning head, which is preferably configured as described above, and with an outlet line connected to the surface cleaning head, the surface cleaning head comprising a housing having a downwardly open cleaning space surrounded by a peripheral wall at least one cleaning nozzle is freely rotatably mounted on a spray arm about an axis of rotation for applying cleaning liquid to the surface to be cleaned, and wherein the surface cleaning head for sucking the cleaning liquid applied to the surface comprises a jet pump having a pump inlet channel in fluid communication with the cleaning chamber is connected via a mixing chamber with a collecting channel, wherein upstream of the collecting channel, a driving nozzle for forming a suction flow is arranged and downstream of the collecting channel at the surfaces cleaning head the outlet pipe is connected. In order to be able to reduce the pressure and the delivery rate of the cleaning liquid supplied to the surface cleaning arrangement without impairing the suction force of the jet pump, the longitudinal axis of the pump inlet channel is aligned radially with the axis of rotation of the at least one spray arm and the pump inlet channel adjoins the peripheral wall of the cleaning chamber, and Diameter of the catch channel is one third to two thirds of the inner diameter of the outlet pipe.

Durch die radiale Ausrichtung des Pumpeneinlasskanals, der sich unmittelbar an die Umfangswand des Reinigungsraumes anschließt, und durch die Wahl der Durchmesser von Fangkanal und Auslassleitung in einem Verhältnis von ein Drittel bis zwei Drittel können eine effektive Absaugung der mit Reinigungsflüssigkeit besprühten Fläche und eine wirksame Ableitung der abgesaugten Flüssigkeit und des gelösten Schmutzes bei verringertem Druck und verringerter Förderleistung der dem Flächenreinigungskopf zugeführten Reinigungsflüssigkeit erzielt werden. Insbesondere ein Innendurchmesser der Auslassleitung von 28 mm bis 40 mm ist von Vorteil.Due to the radial orientation of the pump inlet channel, which adjoins directly to the peripheral wall of the cleaning chamber, and by the choice of the diameter of the collecting channel and outlet pipe in a ratio of one third to two thirds, effective suction of the sprayed with cleaning liquid surface and effective discharge of the aspirated liquid and the dissolved dirt at reduced pressure and reduced flow rate of the surface cleaning head supplied cleaning liquid can be achieved. In particular, an inner diameter of the outlet line of 28 mm to 40 mm is advantageous.

Die nachfolgende Beschreibung einer bevorzugten Ausführungsform der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:

Figur 1:
eine schematische Draufsicht auf eine Flächenreinigungsanordnung mit einem Flächenreinigungskopf, an den eine Auslassleitung angeschlossen ist;
Figur 2:
eine Schnittansicht des Flächenreinigungskopfes entlang der Linie 2-2 in Figur 1;
Figur 3:
eine Schnittansicht des Flächenreinigungskopfes entlang der Linie 3-3 in Figur 1 und
Figur 4:
eine Schnittansicht des Flächenreinigungskopfes entlang der Linie 4-4 in Figur 2.
The following description of a preferred embodiment of the invention serves in conjunction with the drawings for further explanation. Show it:
FIG. 1:
a schematic plan view of a surface cleaning arrangement with a surface cleaning head to which an outlet pipe is connected;
FIG. 2:
a sectional view of the surface cleaning head along the line 2-2 in FIG. 1 ;
FIG. 3:
a sectional view of the surface cleaning head along the line 3-3 in FIG. 1 and
FIG. 4:
a sectional view of the surface cleaning head along the line 4-4 in FIG. 2 ,

In der Zeichnung ist schematisch eine erfindungsgemäße Flächenreinigungsanordnung 5 dargestellt mit einem erfindungsgemäßen Flächenreinigungskopf 10. Der Flächenreinigungskopf 10 weist ein haubenartiges Gehäuse 12 auf, das in der Draufsicht im Wesentlichen dreieckförmig mit abgerundeten Ecken ausgestaltet ist. Das Gehäuse 12 umfasst eine Deckenwand 14, an deren Außenrand sich eine Außenwand 16 anschließt. Im Abstand zur Außenwand 16 steht von der Deckenwand 14 nach unten eine kreiszylindrische Umfangswand 18 ab, die einen Reinigungsraum 20 umgibt. Im Bereich zwischen der Außenwand 16 und der Umfangswand 18 sind - jeweils einem Eckbereich des Gehäuses 12 zugeordnet - Stützelemente in Form von Stützrädern 22, 23 und 24 angeordnet, mit denen sich der Flächenreinigungskopf 10 an einer zu reinigenden Fläche abstützen kann und mit denen der Flächenreinigungskopf 10 an der zu reinigenden Fläche entlang verfahren werden kann.In the drawing, a surface cleaning arrangement according to the invention 5 is shown schematically with a surface cleaning head 10 according to the invention. The surface cleaning head 10 has a hood-like housing 12, which is configured in the plan view substantially triangular with rounded corners. The housing 12 comprises a ceiling wall 14, to whose Outside edge adjoins an outer wall 16. At a distance from the outer wall 16 is from the ceiling wall 14 down from a circular cylindrical peripheral wall 18, which surrounds a cleaning chamber 20. In the area between the outer wall 16 and the peripheral wall 18 are - each associated with a corner region of the housing 12 - support elements in the form of support wheels 22, 23 and 24 are arranged with which the surface cleaning head 10 can be supported on a surface to be cleaned and with which the surface cleaning head 10 can be moved along the surface to be cleaned.

Am freien Rand der Umfangswand 18 ist ein umlaufendes Spritzschutz- und Dichtelement in Form eines Borstenstreifens 26 angeordnet, mit dessen Hilfe der Reinigungsraum 20 gegenüber der zu reinigenden Fläche abgedichtet und das Austreten von Spritzwasser aus dem Reinigungsraum 20 verhindert werden kann.At the free edge of the peripheral wall 18, a circumferential splash guard and sealing element in the form of a bristle strip 26 is arranged, with the help of the cleaning chamber 20 sealed against the surface to be cleaned and the escape of spray water from the cleaning chamber 20 can be prevented.

Oberhalb der Deckenwand 14 ist eine Verteilereinheit 28 angeordnet mit einer Verteilerleitung 29, deren Längsachse 30 senkrecht zur Zylinderachse 31 ausgerichtet ist, welche von der zylindrischen Umfangswand 18 definiert wird.Above the ceiling wall 14, a distributor unit 28 is arranged with a distribution line 29, whose longitudinal axis 30 is aligned perpendicular to the cylinder axis 31, which is defined by the cylindrical peripheral wall 18.

Die Verteilereinheit 28 bildet ein Lagerelement aus, an dem eine Zuleitung 33 um die Längsachse 30 der Verteilerleitung 29 verschwenkbar gelagert ist. An ihrem dem Gehäuse 12 abgewandten freien Ende trägt die Zuleitung 33 ein Anschlusselement 34, an das beispielsweise eine an sich bekannte und deshalb in der Zeichnung nicht dargestellte Sprühlanze eines Hochdruckreinigungsgerätes angeschlossen werden kann.The distributor unit 28 forms a bearing element on which a supply line 33 is mounted pivotably about the longitudinal axis 30 of the distribution line 29. At its free end facing away from the housing 12, the feed line 33 carries a connection element 34, to which, for example, a spray lance of a high-pressure cleaning device known per se and therefore not shown in the drawing can be connected.

Die Zuleitung 33 mündet in die Verteilerleitung 29, an die sich koaxial zur Zylinderachse 31 ausgerichtet eine erste Zweigleitung 36 anschließt, die in den Reinigungsraum 20 eintaucht und an ihrem freien Ende zwei einander diametral gegenüberliegende Sprüharme 37, 38 trägt. An ihrem freien Ende tragen die beiden Sprüharme 37 und 38 jeweils eine Reinigungsdüse 39 bzw. 40. Mittels der Reinigungsdüsen 39 und 40 kann eine zu reinigende Fläche in dem Bereich, der von den Borstenstreifen 26 umgeben ist, mit Reinigungsflüssigkeit besprüht werden. Die Reinigungsdüsen 39 und 40 erzeugen einen schräg nach unten gerichteten Flüssigkeitsstrahl einer Reinigungsflüssigkeit, die beim Austritt aus den Reinigungsdüsen 39, 40 ein Drehmoment auf die Sprüharme 37, 38 ausübt und diese dadurch um die Zylinderachse 31 in Drehung versetzen.The supply line 33 opens into the distribution line 29, which is aligned coaxially with the cylinder axis 31, a first branch line 36 connects, which dips into the cleaning chamber 20 and carries at its free end two diametrically opposed spray arms 37, 38. At their free end, the two spray arms 37 and 38 each carry a cleaning nozzle 39 or 40. By means of the cleaning nozzles 39 and 40, a surface to be cleaned in the area which is surrounded by the bristle strips 26, with cleaning liquid be sprayed. The cleaning nozzles 39 and 40 produce an obliquely downwardly directed liquid jet of a cleaning liquid, which exerts a torque on the spray arms 37, 38 upon exiting the cleaning nozzles 39, 40 and thereby cause them to rotate about the cylinder axis 31.

Über eine zweite Zweigleitung 43 steht die Verteilerleitung 29 mit einer Strahlpumpe 45 in Strömungsverbindung. Letztere umfasst eine Treibdüse 46, die an einer Düsenhalterung 48 festgelegt ist. Die Düsenhalterung 48 ist in einen Pumpeneinlasskanal 50 eingesetzt und mit diesem mechanisch verbunden. In der dargestellten Ausführungsform ist die Düsenhalterung 48 mit dem Pumpeneinlasskanal 50 verrastet. Der Pumpeneinlasskanal 50 erstreckt sich von einer seitlichen Durchbrechung 52 der Umfangswand 18 mit radial zur Zylinderachse 31 ausgerichteter Längsachse 53 durch die Außenwand 16 hindurch, das heißt der Pumpeneinlasskanal 50 steht nach außen über das Gehäuse 12 hervor. Dies wird insbesondere aus Figur 4 deutlich. An den Pumpeneinlasskanal 50 schließt sich einstückig ein Pumpenauslasskanal 55 an, der koaxial zum Pumpeneinlasskanal 50 ausgerichtet ist und an seinem freien Ende eine Anschlusseinrichtung trägt. Die Anschlusseinrichtung umfasst einen Ringraum 61, der den Pumpenauslasskanal 55 an seinem freien Endbereich umgibt und außenseitig von einer Hülse 62 begrenzt ist. Die Hülse 62 ist mit dem Pumpenauslasskanal über eine radial nach außen abstehende Schulter 63 einstückig verbunden. An die Anschlusseinrichtung ist eine Kupplungsvorrichtung 57 angeschlossen. Die Kupplungsvorrichtung 57 umfasst einen Kupplungsflansch 58 mit einer zentralen Anschlussöffnung 59. Ein erster Rohrstutzen 60 taucht in den Ringraum 61 ein und ist mit der Hülse 62 lösbar verbunden, beispielsweise über eine Bajonettverbindung. Auf der dem ersten Rohrstutzen 60 abgewandten Seite ist an den Kupplungsflansch 58 ein koaxial zur Längsachse 53 ausgerichteter zweiter Rohrstutzen 64 angeformt. Der zweite Rohrstutzen 64 bildet ein rohrförmiges Kupplungselement aus, in das eine Auslassleitung in Form eines flexiblen Auslassschlauchs 76 eingesetzt ist. Der Auslassschlauch 76 ist mittels eines Klebers mit der Kupplungsvorrichtung 57 unlösbar verbunden und kann zusammen mit der Kupplungsvorrichtung 57 vom Pumpenauslasskanal 55 getrennt und bei Bedarf an diesen angeschlossen werden. Der Innendurchmesser des Auslassschlauchs 76 ist günstigerweise mit dem Durchmesser der Anschlussöffnung 59 identisch und beträgt vorzugsweise 28 mm bis 40 mm.Via a second branch line 43, the distribution line 29 is in flow communication with a jet pump 45. The latter comprises a motive nozzle 46 which is fixed to a nozzle holder 48. The nozzle holder 48 is inserted into a pump inlet channel 50 and mechanically connected thereto. In the illustrated embodiment, the nozzle holder 48 is latched to the pump inlet channel 50. The pump inlet channel 50 extends from a lateral opening 52 of the peripheral wall 18 with the longitudinal axis 53 aligned radially with respect to the cylinder axis 31 through the outer wall 16, that is to say the pump inlet channel 50 projects outwardly beyond the housing 12. This is especially true FIG. 4 clear. Integral to the pump inlet channel 50 is a pump outlet channel 55, which is aligned coaxially with the pump inlet channel 50 and carries a connection device at its free end. The connection device comprises an annular space 61, which surrounds the pump outlet channel 55 at its free end region and is bounded on the outside by a sleeve 62. The sleeve 62 is integrally connected to the pump outlet channel via a radially outwardly projecting shoulder 63. To the connection device, a coupling device 57 is connected. The coupling device 57 comprises a coupling flange 58 with a central connection opening 59. A first pipe socket 60 dips into the annular space 61 and is releasably connected to the sleeve 62, for example via a bayonet connection. On the side facing away from the first pipe socket 60, a coaxial with the longitudinal axis 53 aligned second pipe socket 64 is integrally formed on the coupling flange 58. The second pipe socket 64 forms a tubular coupling element into which an outlet pipe in the form of a flexible outlet hose 76 is inserted. The outlet hose 76 is permanently connected by means of an adhesive to the coupling device 57 and can separated from the pump discharge passage 55 together with the coupling device 57 and connected to it when necessary. The inner diameter of the outlet tube 76 is conveniently identical to the diameter of the connection opening 59 and is preferably 28 mm to 40 mm.

Der Strömungsquerschnitt des Pumpeneinlasskanals 50 vermindert sich im Bereich zwischen der seitlichen Durchbrechung 52 und dem Pumpenauslasskanal 55. Er weist hierzu zwei schräg zueinander, nämlich in einem Winkel von 90° zueinander ausgerichtete Seitenwände 78, 79 auf. Dies wird aus Figur 4 deutlich.The flow cross section of the pump inlet channel 50 decreases in the region between the lateral opening 52 and the pump outlet channel 55. For this purpose, it has two obliquely to each other, namely at an angle of 90 ° to each other aligned side walls 78, 79. This is going out FIG. 4 clear.

Innerhalb des Pumpenauslasskanals 55 schließt sich an den Pumpeneinlasskanal 50 eine Mischkammer 65 an, die kegelstumpfförmig ausgestaltet ist und sich in die dem Pumpeneinlasskanal 50 abgewandte Richtung konisch verjüngt mit einem Kegelwinkel von 30°. An die Mischkammer 65 schließt sich im Pumpenauslasskanal 55 ein zylindrischer Fangkanal 67 an, der einen Durchmesser von 14 bis 18 mm und eine Länge von 40 mm aufweist. Der Abstand zwischen der Treibdüse 46 und dem Fangkanal 67 beträgt mindestens 10 mm, insbesondere mindestens 15 mm und maximal 60 mm. Im dargestellten Ausführungsbeispiel beträgt der Abstand 40 mm. An den Fangkanal 67 schließt sich in die dem Pumpeneinlasskanal 50 abgewandte Richtung innerhalb des Pumpenauslasskanals 55 ein Diffusor 69 an, der sich in die dem Pumpeneinlasskanal 50 abgewandte Richtung konisch erweitert, der Konuswinkel des Diffusors 69 beträgt in der dargestellten Ausführungsform 8°. In seinem Endbereich ist der Diffusor 69 vom Ringraum 61 umgeben, in den der erste Rohrstutzen 60 der Kupplungsvorrichtung 57 eintaucht. An das Ende des Diffusors schließt sich die Anschlussöffnung 59 an.Within the pump outlet channel 55, a mixing chamber 65 adjoins the pump inlet channel 50, which is embodied in the shape of a truncated cone and tapers conically in the direction away from the pump inlet channel 50 with a cone angle of 30 °. Adjoining the mixing chamber 65 in the pump outlet channel 55 is a cylindrical catching channel 67 which has a diameter of 14 to 18 mm and a length of 40 mm. The distance between the motive nozzle 46 and the capture channel 67 is at least 10 mm, in particular at least 15 mm and a maximum of 60 mm. In the illustrated embodiment, the distance is 40 mm. A diffuser 69, which widens conically in the direction away from the pump inlet channel 50, adjoins the catching channel 67 in the direction away from the pump inlet channel 50, the cone angle of the diffuser 69 is 8 ° in the illustrated embodiment. In its end region of the diffuser 69 is surrounded by the annular space 61, in which the first pipe socket 60 of the coupling device 57 is immersed. At the end of the diffuser, the connection opening 59 connects.

Wie bereits erwähnt, ist die Treibdüse 46 an der Düsenhalterung 48 gehalten. Die Treibdüse 46 ist fluchtend zum Fangkanal 67 ausgerichtet und taucht mit ihrem freien Ende in die Mischkammer 65 ein. Die Strömungsverbindung zwischen der Treibdüse 46 und der Verteilerleitung 29 erfolgt über die zweite Zweigleitung 43. Diese weist einen ersten Leitungsabschnitt 71 auf, der von der Verteilerleitung 29 ausgeht und im Abstand zur ersten Zweigleitung 36 die Deckenwand 14 des Gehäuses 12 durchgreift. Innerhalb des Reinigungsraums 20 schließt sich oberhalb des Sprüharme 37, 38 an den ersten Leitungsabschnitt 71 ein zweiter Leitungsabschnitt 72 der zweiten Zweigleitung 43 an, an dessen freiem Ende die Düsenhalterung 48 mit der Treibdüse 46 gehalten ist. Die Treibdüse 46 ist als Kegelstrahldüse ausgestaltet, das heißt sie gibt einen kegelstrahlförmigen Flüssigkeitsstrahl ab, der auf den Fangkanal 67 gerichtet ist. Der Öffnungswinkel des Kegelstrahls beträgt in der dargestellten Ausführungsform etwa 22°.As already mentioned, the motive nozzle 46 is held on the nozzle holder 48. The motive nozzle 46 is aligned with the capture channel 67 and immersed with its free end in the mixing chamber 65 a. The flow connection between the motive nozzle 46 and the manifold 29 via the second branch line 43. This has a first line section 71 which of the distribution line 29 goes out and at a distance from the first branch line 36, the ceiling wall 14 of the housing 12 passes through. Within the cleaning chamber 20, a second line section 72 of the second branch line 43 adjoins the first line section 71 above the spray arms 37, 38, at the free end of which the nozzle holder 48 with the drive nozzle 46 is held. The motive nozzle 46 is designed as a cone jet nozzle, that is, it emits a cone-shaped liquid jet, which is directed to the capture channel 67. The opening angle of the cone beam is about 22 ° in the illustrated embodiment.

Wie bereits erwähnt, beträgt der Anschlussdurchmesser der Kupplungsvorrichtung 57, das heißt der Durchmesser der Anschlussöffnung 59, ebenso wie der Innendurchmesser des Auslassschlauches 76 28 mm bis 40 mm. Das Verhältnis des Durchmessers des Fangkanals 67 zum Anschlussdurchmesser der Kupplungsvorrichtung 57 und damit zum Innendurchmesser des Auslassschlauches 76 beträgt ein Drittel bis zwei Drittel.As already mentioned, the connection diameter of the coupling device 57, that is to say the diameter of the connection opening 59, as well as the inner diameter of the outlet hose 76 is 28 mm to 40 mm. The ratio of the diameter of the catch channel 67 to the connection diameter of the coupling device 57 and thus to the inner diameter of the outlet tube 76 is one third to two thirds.

Der von der Treibdüse 46 abgegebene Flüssigkeitsstrahl trifft auf den Fangkanal 67 und erzeugt nach dem bekannten Venturiprinzip eine in den Pumpeneinlasskanal 50 und den sich daran anschließenden Pumpenauslasskanal 55 gerichtete Saugströmung. Mittels der Saugströmung kann Reinigungsflüssigkeit, die auf die zu reinigende Fläche aufgebracht wurde, zusammen mit abgereinigtem Schmutz von der Fläche aufgenommen und über den Auslassschlauch 76 abgegeben werden. Der Auslassschlauch 76 ist lösbar mit dem Pumpenauslasskanal 55 verbunden. Innerhalb des Auslassschlauches 76 bildet sich unter der Wirkung der Treibdüse 46 eine Flüssigkeitsströmung aus, die in die dem Flächenreinigungskopf 10 abgewandte Richtung gerichtet ist. Abgesaugte Reinigungsflüssigkeit durchströmt den Auslassschlauch 76 selbst dann, wenn dieser eine gewisse Steigung überwindet. Aufgrund der radialen Ausrichtung des sich an die Umfangswand 18 anschließenden Pumpeneinlasskanals 50 und des sich an diesen anschließenden Pumpenauslasskanals 55 sowie aufgrund des Durchmessers des Fangkanals 67 und des Anschlussdurchmessers der Kupplungsvorrichtung 57 sowie der gewählten Abstände zwischen der Treibdüse 46 und dem Fangkanal 67 ist die Gefahr gering, dass Flüssigkeit im Auslassschlauch 76 wieder zurück zum Flächenreinigungskopf 10 strömt.The jet of liquid emitted by the motive nozzle 46 strikes the capture channel 67 and generates, according to the known venturi principle, a suction flow directed into the pump inlet channel 50 and the subsequent pump outlet channel 55. By means of the suction flow, cleaning liquid which has been applied to the surface to be cleaned can be picked up from the surface together with cleaned dirt and discharged via the outlet hose 76. The outlet hose 76 is detachably connected to the pump outlet passage 55. Within the outlet hose 76, under the action of the motive nozzle 46, a liquid flow is formed, which is directed in the direction away from the surface cleaning head 10. Suction cleaning liquid flows through the outlet hose 76 even if it overcomes a certain slope. Due to the radial orientation of the adjoining the peripheral wall 18 pump inlet channel 50 and the subsequent thereto Pumpenauslasskanals 55 and due to the diameter of the catch channel 67 and the connection diameter of the coupling device 57 and the selected distances between the driving nozzle 46 and the catching channel 67, the risk is low that liquid in the outlet hose 76 flows back to the surface cleaning head 10 again.

Der Flächenreinigungskopf 10 zeichnet sich auch durch eine hohe mechanische Stabilität aus. Die Reinigungsdüsen 39, 40 sind ebenso wie die Treibdüse 46 innerhalb des Gehäuses 12 angeordnet und auch der zweite Leitungsabschnitt 72 der zweiten Zweigleitung 43 verläuft innerhalb des Gehäuses 12 und ist dadurch vor mechanischen Beeinträchtigungen geschützt. Der Pumpeneinlasskanal 50 ist sowohl an der Umfangswand 18 als auch an der Außenwand 16 fixiert und bildet eine stabile Verankerung für den Pumpenauslasskanal 55. Das Gehäuse 12 mit der Umfangswand 18 und der Außenwand 16 bildet in Kombination mit dem Pumpeneinlasskanal 50 und dem Pumpenauslasskanal 55 ein einteiliges Kunststoffformteil aus, das eine hohe mechanische Stabilität aufweist und kostengünstig herstellbar ist. Die Düsenhalterung 48 kann durch die seitliche Durchbrechung 52 der Umfangswand 18 hindurch in den Pumpeneinlasskanal 50 eingesetzt und mit diesem verrastet werden, nachdem zuvor die Treibdüse 46 an der Düsenhalterung 48 festgelegt wurde.The surface cleaning head 10 is also characterized by a high mechanical stability. The cleaning nozzles 39, 40 are arranged as well as the driving nozzle 46 within the housing 12 and also the second line section 72 of the second branch line 43 extends within the housing 12 and is thereby protected from mechanical damage. The pump inlet passage 50 is fixed to both the peripheral wall 18 and the outer wall 16 and forms a stable anchorage for the pump outlet passage 55. The housing 12 having the peripheral wall 18 and the outer wall 16 forms a one-piece in combination with the pump inlet passage 50 and the pump outlet passage 55 Plastic molding, which has a high mechanical stability and is inexpensive to produce. The nozzle holder 48 can be inserted through the lateral opening 52 of the peripheral wall 18 into the pump inlet channel 50 and locked with this after previously the drive nozzle 46 has been fixed to the nozzle holder 48.

Claims (16)

  1. Surface cleaning head (10) for cleaning a surface, comprising a housing (12) having a cleaning chamber (20) which is surrounded by a peripheral wall (18) and is open downwards, and in which at least one cleaning nozzle (39, 40) is mounted on a spray arm (37, 38) so as to be freely rotatable about an axis of rotation (31) for applying cleaning fluid to the surface to be cleaned, and comprising a jet pump (45) for suctioning off cleaning fluid that is applied to the surface, the jet pump (45) having a pump inlet channel (50) which is in flow connection with the cleaning chamber (20) and which adjoins the peripheral wall (18) of the cleaning chamber (20) and which is connected to a combining channel (67) via a mixing chamber (65), a motive nozzle (46) for forming a suction flow being situated upstream from the combining channel (67), and the longitudinal axis (53) of the pump inlet channel (50) being oriented radially with respect to the axis of rotation (31) of the at least one spray arm (37, 38), characterized in that the diameter of the combining channel (67) is 14 mm to 18 mm, and that the distance between the motive nozzle (46) and the combining channel (67) is at least 10 mm.
  2. Surface cleaning head according to claim 1, characterized in that the distance between the motive nozzle (46) and the combining channel (67) is at most 60 mm.
  3. Surface cleaning head according to claim 1 or 2, characterized in that the distance between the motive nozzle (46) and the combining channel (67) is 1.3 to 4.3 times the diameter of the combining channel (67).
  4. Surface cleaning head according to one of the preceding claims, characterized in that the length of the combining channel (67) is at least 10 mm.
  5. Surface cleaning head according to one of the preceding claims, characterized in that a diffuser (69) adjoins the combining channel (67) and has an opening angle of 4° to 12°.
  6. Surface cleaning head according to claim 5, characterized in that the combining channel (67) and the diffuser (69) have a combined length of at least 30 mm.
  7. Surface cleaning head according to one of the preceding claims, characterized in that the motive nozzle (46) is configured as a cone jet nozzle, the opening angle of the cone jet being 15° to 40°.
  8. Surface cleaning head according to one of the preceding claims, characterized in that the housing has an outer wall (16) which surrounds the peripheral wall (18) of the cleaning chamber (20), the pump inlet channel (50) being mounted on the peripheral wall (18) and on the outer wall (16).
  9. Surface cleaning head according to claim 8, characterized in that at least three support elements (22, 23, 24) are situated in the region between the peripheral wall (18) and the outer wall (16) for supporting the surface cleaning head (10) on the surface to be cleaned, the peripheral wall (18) having a circular cylindrical shape, and in top view, the outer wall (16) having a triangular shape with rounded corner regions, and one support element (22, 23, 24) being situated in each corner region.
  10. Surface cleaning head according to one of the preceding claims, characterized in that a pump outlet channel (55) which defines the mixing chamber (65) and the combining channel (67) and is connectable to an outlet line (76) is mounted at the end of the pump inlet channel (50) that faces away from the peripheral wall (18).
  11. Surface cleaning head according to one of the preceding claims, characterized in that the motive nozzle (46) is mounted on a nozzle mounting (48) which is insertable into the pump inlet channel (50) and mechanically connectable to the pump inlet channel (50).
  12. Surface cleaning head according to claim 11, characterized in that the nozzle mounting (48) is connected, via a second line portion (72) extending above the at least one spray arm (37, 38) within the cleaning chamber (20), to a first line portion (71) which passes through a top wall (14) of the cleaning chamber (20).
  13. Surface cleaning head according to one of the preceding claims, characterized in that the surface cleaning head (10) has a distributor unit (28) which is connected to the at least one cleaning nozzle (39, 40) via a first branch line (36) and to the motive nozzle (46) via a second branch line (43), a supply line (33) being pivotably mounted on the distributor unit (28).
  14. Surface cleaning head according to one of the preceding claims, characterized in that a connecting device (61, 62) for connecting an outlet line (76) is situated downstream from the combining channel (67).
  15. Surface cleaning head according to claim 14, characterized in that a coupling device (57) which has a connection diameter of 28 mm to 40 mm and which is connected to the outlet line (76) is connectable to the connecting device (61, 62).
  16. Surface cleaning arrangement for cleaning a surface, comprising a surface cleaning head (10) according to one of the preceding claims, and comprising an outlet line (76) which is connected to the surface cleaning head (10), the surface cleaning head (10) comprising a housing (12) having a cleaning chamber (20) which is surrounded by a peripheral wall (18) and is open downwards, and in which at least one cleaning nozzle (39, 40) is mounted on a spray arm (37, 38) so as to be freely rotatable about an axis of rotation (31) for applying cleaning fluid to the surface to be cleaned, and the surface cleaning head (10) for suctioning off cleaning fluid that is applied to the surface comprising a jet pump (45) having a pump inlet channel (50) which is in flow connection with the cleaning chamber (20) and is connected to a combining channel (67) via a mixing chamber (65), a motive nozzle (46) for forming a suction flow being situated upstream from the combining channel (67), and the outlet line (76) being connected to the surface cleaning head (10) downstream from the combining channel (67), the longitudinal axis (53) of the pump inlet channel (50) being oriented radially with respect to the axis of rotation (31) of the at least one spray arm (37, 38), and the pump inlet channel (50) adjoining the peripheral wall (18) of the cleaning chamber (20), and the diameter of the combining channel (67) being one-third to two-thirds the internal diameter of the outlet line (76).
EP11708819.5A 2010-03-19 2011-03-14 Surface-cleaning head and surface-cleaning arrangement Active EP2547463B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010003079A DE102010003079A1 (en) 2010-03-19 2010-03-19 Surface cleaning head and surface cleaning arrangement
PCT/EP2011/053778 WO2011113784A2 (en) 2010-03-19 2011-03-14 Surface-cleaning head and surface-cleaning arrangement

Publications (2)

Publication Number Publication Date
EP2547463A2 EP2547463A2 (en) 2013-01-23
EP2547463B1 true EP2547463B1 (en) 2015-01-14

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Application Number Title Priority Date Filing Date
EP11708819.5A Active EP2547463B1 (en) 2010-03-19 2011-03-14 Surface-cleaning head and surface-cleaning arrangement

Country Status (8)

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US (1) US8695153B2 (en)
EP (1) EP2547463B1 (en)
CN (1) CN102802820B (en)
BR (1) BR112012023618A2 (en)
DE (1) DE102010003079A1 (en)
DK (1) DK2547463T3 (en)
RU (1) RU2527986C2 (en)
WO (1) WO2011113784A2 (en)

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DE102021122710A1 (en) 2021-09-02 2023-03-02 Alfred Kärcher SE & Co. KG POWER NOZZLE AND SURFACE CLEANING HEAD WITH ONE POWER NOZZLE
DE102021122708A1 (en) 2021-09-02 2023-03-02 Alfred Kärcher SE & Co. KG SURFACE CLEANING HEAD

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DE102020126790A1 (en) 2020-10-13 2022-04-14 Mosmatic Ag Surface cleaner with multiple uses

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DE102021122710A1 (en) 2021-09-02 2023-03-02 Alfred Kärcher SE & Co. KG POWER NOZZLE AND SURFACE CLEANING HEAD WITH ONE POWER NOZZLE
DE102021122708A1 (en) 2021-09-02 2023-03-02 Alfred Kärcher SE & Co. KG SURFACE CLEANING HEAD
EP4144442A1 (en) 2021-09-02 2023-03-08 Alfred Kärcher SE & Co. KG Surface cleaning head
WO2023030966A1 (en) 2021-09-02 2023-03-09 Alfred Kärcher SE & Co. KG Motive fluid nozzle and surface cleaning head having a motive fluid nozzle

Also Published As

Publication number Publication date
US20130061418A1 (en) 2013-03-14
CN102802820A (en) 2012-11-28
BR112012023618A2 (en) 2016-08-02
RU2527986C2 (en) 2014-09-10
RU2012144393A (en) 2014-04-27
WO2011113784A3 (en) 2011-11-24
CN102802820B (en) 2014-10-22
WO2011113784A2 (en) 2011-09-22
DK2547463T3 (en) 2015-03-02
DE102010003079A1 (en) 2011-09-22
EP2547463A2 (en) 2013-01-23
US8695153B2 (en) 2014-04-15

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