EP4144442A1 - Tête de nettoyage pour surfaces - Google Patents

Tête de nettoyage pour surfaces Download PDF

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Publication number
EP4144442A1
EP4144442A1 EP22191732.1A EP22191732A EP4144442A1 EP 4144442 A1 EP4144442 A1 EP 4144442A1 EP 22191732 A EP22191732 A EP 22191732A EP 4144442 A1 EP4144442 A1 EP 4144442A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
cleaning head
head according
surface cleaning
branch line
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.)
Pending
Application number
EP22191732.1A
Other languages
German (de)
English (en)
Inventor
Tobias GELTZ
Daniel MULLINS
Florian Seybold
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alfred Kaercher SE and Co KG filed Critical Alfred Kaercher SE and Co KG
Publication of EP4144442A1 publication Critical patent/EP4144442A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • B05B1/3421—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with channels emerging substantially tangentially in the swirl chamber
    • B05B1/3431—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with channels emerging substantially tangentially in the swirl chamber the channels being formed at the interface of cooperating elements, e.g. by means of grooves
    • B05B1/3442—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with channels emerging substantially tangentially in the swirl chamber the channels being formed at the interface of cooperating elements, e.g. by means of grooves the interface being a cone having the same axis as the outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • B05B1/3484—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with a by-pass conduit extending from the swirl chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/30—Arrangements for collecting, re-using or eliminating excess spraying material comprising enclosures close to, or in contact with, the object to be sprayed and surrounding or confining the discharged spray or jet but not the object to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/04—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet
    • B05B3/06—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet by jet reaction, i.e. creating a spinning torque due to a tangential component of the jet
    • 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
    • B08B3/028—Spray guns
    • 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, comprising a housing which has a cleaning space which is surrounded by a peripheral wall and is open at the bottom when the surface cleaning head is in a horizontal position of use, in which space at least one spray arm is mounted so that it can rotate freely about an axis of rotation, with the spray arm being a cleaning nozzle that can be subjected to pressurized cleaning liquid is held for applying cleaning liquid to the surface to be cleaned, and further comprising a jet pump for sucking off cleaning liquid applied to the surface to be cleaned, wherein the jet pump has a suction connection which is in flow connection with the cleaning space, which adjoins the peripheral wall and to which an outlet line can be connected, wherein a propulsion nozzle that can be acted upon by pressurized cleaning liquid is arranged in the suction connection to form a suction flow.
  • Such a surface cleaning head is from EP 2 547 463 B1 known.
  • a spray lance of a high-pressure cleaning device can be connected to the surface cleaning head, so that the cleaning nozzle held on a spray arm in a cleaning room can be supplied with pressurized cleaning liquid from the high-pressure cleaning device.
  • the cleaning liquid can be sprayed onto the surface to be cleaned using the cleaning nozzle.
  • the cleaning nozzle generates a jet of liquid which is directed obliquely downwards in the direction of the surface to be cleaned and in the process experiences a recoil so that the spray arm is set in rotation about the axis of rotation together with the cleaning nozzle.
  • at least two diametrically opposed spray arms are used, on each of which a cleaning nozzle is arranged, wherein the cleaning nozzles can be acted upon at the same time with pressurized cleaning liquid.
  • the EP 2 547 463 B1 known surface cleaning head has a jet pump that works on the principle of a Venturi pump. It includes a suction nozzle in which a propulsion nozzle is positioned, which can also be charged with pressurized cleaning fluid. By dispensing pressurized cleaning liquid, a suction flow can be generated inside the suction nozzle by means of the propulsion nozzle.
  • the suction connection is flow-connected to the cleaning chamber of the surface cleaning head, so that under the effect of the suction flow, cleaning liquid applied to the surface can be sucked up together with the dirt that has been cleaned off.
  • An outlet line can be connected to the free end of the suction nozzle, via which the cleaning liquid that has been sucked up can be discharged together with the dirt that has been cleaned off.
  • the object of the present invention is therefore to further develop a surface cleaning head of the type mentioned at the outset in such a way that it enables good suction with less cleaning liquid consumption.
  • a surface cleaning head of the generic type according to the invention in that the driving nozzle is designed as a full cone spray nozzle whose nozzle parameter is 0.18 l/min to 0.35 l/min at a reference pressure of 1 bar.
  • the surface cleaning head according to the invention is characterized, among other things, by the use of a driving nozzle in the form of a full cone spray nozzle.
  • a driving nozzle in the form of a full cone spray nozzle.
  • a nozzle emits a cone-shaped jet of liquid, under the effect of which a strong suction flow forms inside the suction socket, so that cleaning liquid and dirt that has been applied to the surface to be cleaned can be sucked up and discharged via the suction socket and the outlet line connected to it.
  • a particularly good suction efficiency i.e. good suction with relatively low consumption of pressurized cleaning liquid, is achieved by the fact that the nozzle parameter of the full cone spray nozzle is 0.18 l/min to 0.35 l/min at a reference pressure of 1 bar.
  • the nozzle characteristic is defined as the flow rate at a specific reference pressure, namely the flow rate of the cleaning liquid flowing through the drive nozzle at a reference pressure of 1 bar is 0.18 l/min to 0.35 l/min.
  • Cleaning liquid under pressure can be provided to the surface cleaning head by a high-pressure cleaning device. Part of the cleaning liquid provided is sprayed onto the surface to be cleaned and the remaining part of the cleaning liquid provided is used to form a suction flow in order to suck up the sprayed cleaning liquid together with the dirt that has been cleaned off.
  • the use of the propulsion nozzle in the form of a full cone spray nozzle with a nozzle parameter of 0.18 l/min to 0.35 l/min at a reference pressure of 1 bar enables effective suction of cleaning liquid applied to the surface and cleaned dirt with relatively low consumption of below Pressurized cleaning liquid, so that a large part of the cleaning liquid provided can be sprayed onto the surface to be cleaned. This allows a surface to be effectively cleaned and vacuumed using the surface cleaning head.
  • the good suction of cleaning liquid applied to the surface to be cleaned and cleaned dirt that can be achieved by means of the surface cleaning head according to the invention allows a dirt liquor to be discharged via the outlet line even if the outlet line overcomes height differences of up to 0.8 m.
  • the pressure of the cleaning liquid fed to the surface cleaning head can be, for example, 50 bar to 180 bar, in particular 70 bar to 120 bar.
  • the total consumption of cleaning liquid for cleaning and suction can be 200 l/h to 700 l/h, for example.
  • the nozzle parameter of the driving nozzle is 0.18 l/min to 0.28 l/min.
  • the driving nozzle comprises a nozzle cap which has a nozzle outlet opening which is arranged at the tip of a conical end section of an interior space of the nozzle cap, a nozzle insert being arranged in the conical end section, the nozzle insert having a cylindrical base which is followed in the direction of the nozzle outlet opening by a truncated cone-shaped extension, the outer surface of which rests in a form-fitting manner on an inner wall of the conical end section of the interior of the nozzle cap, the nozzle insert having a through-channel aligned with the nozzle outlet opening and a plurality of swirl channels molded into the outer surface of the truncated cone-shaped extension, the Through-channel opens into a swirl chamber immediately upstream in the conical end section of the nozzle outlet opening, and wherein the swirl channels are offset laterally to the Through channel open into the swirl chamber.
  • the driving nozzle comprises a nozzle cap which has an interior space.
  • An end section of the inner space is designed in the shape of a cone.
  • the nozzle cap has a nozzle outlet opening, through which the pressurized cleaning liquid can be discharged from the driving nozzle.
  • the nozzle outlet opening extends into the conical end section of the interior the nozzle cap.
  • This end section accommodates a nozzle insert which has a cylindrical base and an adjoining frustoconical extension.
  • a lateral surface of the truncated cone-shaped extension is in positive contact with an inner wall of the conical end section.
  • the nozzle insert has a through-channel aligned with the nozzle outlet opening.
  • the nozzle insert has a plurality of swirl channels which are formed into the outer surface of the frustoconical extension.
  • the conical end section of the interior of the nozzle cap forms a swirl chamber between the nozzle insert and the nozzle outlet opening.
  • the through-channel of the nozzle insert opens centrally into the swirl chamber and the swirl channels open into the swirl chamber laterally offset to the through-channel.
  • the passage channel and the nozzle outlet opening are preferably arranged collinear to a central axis of the propulsion nozzle.
  • 2, 3, 4, 5 or 6 swirl ducts are formed in the outer surface of the frustoconical extension.
  • the swirl channels are distributed uniformly over the circumference of the frustoconical extension.
  • the swirl channels are preferably designed in a straight line. This makes it possible to keep the production costs for the swirl ducts low.
  • the longitudinal axes of the swirl ducts are aligned skewed to the longitudinal axis of the through-duct.
  • the flow cross section of the nozzle outlet opening is at most one third of the sum of the flow cross sections of the through channel and the swirl channels.
  • pressurized cleaning liquid can be supplied to the swirl chamber via relatively large flow cross sections, and the cleaning liquid can be discharged from the swirl chamber via a relatively small flow cross section. It has been shown that this can improve the suction efficiency of the jet pump.
  • the flow cross-section of the nozzle outlet opening is preferably at most as large as the flow cross-section of the through-channel and is at most half the sum of the flow cross-sections of the swirl channels.
  • the flow cross section of the nozzle outlet opening is at most one fifth of the sum of the flow cross sections of the through channel and the swirl channels.
  • the flow cross section of the nozzle outlet opening is favorably smaller than the flow cross section of the through channel and also smaller than the flow cross section of each individual swirl channel.
  • the surface cleaning head has an inlet line for supplying pressurized cleaning liquid, with the inlet line being followed by a liquid distributor device which is connected to the driving nozzle via a first branch line and to the at least one cleaning nozzle via a second branch line.
  • a liquid distributor device which is connected to the driving nozzle via a first branch line and to the at least one cleaning nozzle via a second branch line.
  • an end region of the first branch line which is remote from the liquid distribution device protrudes into the suction connection piece and carries the propulsion nozzle.
  • the nozzle cap of the propulsion nozzle is held in a detachable and liquid-tight manner on the end region of the first branch line protruding into the suction socket, with the nozzle insert of the propulsion nozzle bearing against one or more support surfaces of the first branch line.
  • the nozzle insert rests with its base on one or more support surfaces of the first branch line and with a lateral surface of the frustoconical extension on the inner wall of the conical end section of the interior of the nozzle cap. This allows the nozzle insert to be clamped between the inner wall of the end section and the at least one support surface of the first branch line and thereby fixed mechanically.
  • the nozzle cap is screwed to the end region of the first branch line that protrudes into the suction connector.
  • the nozzle cap can be screwed onto the end region of the first branch line, surrounding the nozzle insert, which is supported on one side on an inner wall of the nozzle cap and on the other side on one or more support surfaces of the first branch line.
  • a sealing element is arranged between the nozzle cap and the end region of the first branch line that protrudes into the suction connector.
  • a sealing ring for example, can be used as a sealing element, which can be positioned in an annular groove that surrounds the end region of the first branch line in the circumferential direction.
  • the first branch line establishes a flow connection between the liquid distribution device and the propulsion nozzle. It is advantageous if the first branch line is detachably connected to the liquid distributor device is. This allows easy installation of the first branch line and also makes it possible to remove the first branch line together with the driving nozzle held on it from the surface cleaning head, so that the driving nozzle can then be removed from the first branch line, for example for cleaning purposes or to replace the nozzle insert .
  • the flow rate of the cleaning liquid that can be fed to the driving nozzle via the first branch line is smaller than the flow rate of the cleaning liquid that can be fed to the at least one cleaning nozzle via the second branch line.
  • the amount of cleaning liquid that is released from the driving nozzle per unit of time is therefore less than the amount of cleaning liquid that is released via the at least one cleaning nozzle.
  • the flow rate of the cleaning liquid that can be supplied to the driving nozzle via the first branch line is preferably at most 50% of the flow rate of the cleaning liquid that can be supplied to the at least one cleaning nozzle via the second branch line.
  • a filter device is arranged in the flow path of the pressurized cleaning liquid upstream of the nozzle insert of the propulsion nozzle. Dirt particles can be held back by means of the filter device, so that they cannot impair the driving nozzle.
  • the filter device has a convexly curved filter surface.
  • the convex curvature allows a provide a relatively large filter area without this requiring a large amount of space for the filter device.
  • the filter device can have a cup-shaped or bell-shaped filter surface.
  • the filter device preferably has a sieve.
  • the mesh size of the sieve is preferably at most 0.6 mm, in particular at most 0.3 mm.
  • the screen preferably consists of metal, in particular steel, and/or a plastic material.
  • the filter device is located directly in front of the nozzle insert.
  • the filter device can be arranged upstream of the nozzle insert in the interior of the nozzle cap of the driving nozzle.
  • the propulsion nozzle in combination with the filter device, forms an assembly that is positioned on the end region of the first branch line that protrudes into the suction connector.
  • the filter device is advantageously arranged between an end face of the first branch line which faces the nozzle insert of the driving nozzle and the base of the nozzle insert.
  • the filter device is clamped between the end face of the first branch line and the base of the nozzle insert.
  • the driving nozzle is arranged in a suction connection of the jet pump of the surface cleaning head.
  • the suction connector preferably forms an inlet channel which is followed by a mixing channel which tapers conically in the direction of flow of the cleaning liquid.
  • the mixing channel is followed by a collecting channel, via which the mixing channel is connected to a diffuser.
  • the catching channel is preferably configured in a cylindrical shape.
  • the diameter of the catching channel is preferably at least 20 mm, in particular 20 mm to 25 mm, for example 23 mm.
  • the distance between the driving nozzle and the catching channel is preferably a maximum of 40 mm.
  • the diameter of the nozzle outlet opening of the driving nozzle is approximately 0.7 mm.
  • the diameter of the passage channel of the nozzle insert of the driving nozzle is preferably about 0.8 mm.
  • the flow cross section of the swirl channels is preferably about 0.6 mm 2 to 0.7 mm 2 in each case.
  • a surface cleaning head according to the invention is shown schematically in a horizontal position of use and assigned the reference numeral 10 overall.
  • a surface 12 to be cleaned can be subjected to pressurized cleaning fluid in order to clean the surface 12, and cleaning fluid applied to the surface 12 can be sucked up together with the dirt that has been cleaned off and discharged via an outlet line 14.
  • the surface cleaning head 10 has a hood-like housing 16 on which three support wheels 18, 20, 22 are rotatably mounted. With the help of the support wheels 18, 20, 22, the surface cleaning head 10 can be moved along the surface 12 to be cleaned.
  • the housing 16 has an intermediate wall 24 which is adjoined by a circular-cylindrical peripheral wall 26 in the direction of the surface 12 to be cleaned.
  • the peripheral wall 26 surrounds a cleaning chamber 28 and, on its edge facing the surface 12 to be cleaned, carries a peripheral splash protection element 30 which, in the exemplary embodiment shown, is designed in the form of a bristle strip.
  • the housing 16 defines a distributor space 32 which accommodates a liquid distributor device 34.
  • An inlet line 36 protrudes into the distribution space 32, which is connected to the liquid distribution device 34 and, at its end remote from the liquid distribution device 34, carries a connection element 38, to which, for example, a spray lance known per se and therefore not shown in the drawing to achieve a better overview of a high-pressure cleaning device can be connected.
  • a cleaning liquid preferably water
  • the pressure of the cleaning liquid can be, for example, 50 bar to 180 bar, in particular 70 bar to 120 bar.
  • the flow rate of the cleaning liquid supplied to the surface cleaning head 10 is preferably about 200 l/h to about 700 l/h.
  • the peripheral wall 26 has a lateral opening 40, which is followed by a suction nozzle 42 of a jet pump 44, explained in more detail below.
  • the suction connection 42 forms an inlet duct 46, which immediately adjoins the lateral opening 40 and which is adjoined via a mixing duct 48, which tapers conically in the direction away from the inlet duct 46, to a cylindrical collecting duct 50, which in turn is adjoined by a diffuser 52 connects.
  • the capture channel 50 is cylindrical and the diffuser 52 widens conically in the direction away from the capture channel 50 .
  • the outlet line 14 can be connected to the diffuser 52 . If desired, the outlet line 14 can be disconnected from the diffuser 52.
  • the cleaning liquid supplied to the surface cleaning head 10 via the inlet line 36 is divided by the liquid distribution device 34, a first portion of the cleaning liquid being supplied via a first branch line 54 to a propulsion nozzle 56 arranged in the inlet channel 46 of the suction connection 42 of the jet pump 44, and a second portion of the cleaning liquid being supplied via a second branch line 58 to a cleaning nozzle arrangement 60 which is arranged in the cleaning chamber .
  • the cleaning nozzle arrangement 60 has a first cleaning nozzle 62 and a second cleaning nozzle 64 .
  • the first cleaning nozzle 62 is arranged on a first spray arm 66 and the second cleaning nozzle 64 is arranged on a second spray arm 68 .
  • the two spray arms 66, 68 are diametrically opposite one another and are mounted on the second branch line 58 so as to be freely rotatable about an axis of rotation 70 oriented perpendicularly to the surface 12 to be cleaned. Pressurized cleaning liquid can be sprayed onto the surface 12 to be cleaned via the first cleaning nozzle 62 and the second cleaning nozzle 64 .
  • the cleaning nozzles 62, 64 experience a recoil under the effect of which the spray arms 66, 68 are set in rotation about the axis of rotation 70.
  • the first branch line 54 can be detachably connected to the liquid distribution device 34 by means of a connecting element 72 which is formed onto the end of the first branch line 54 facing the liquid distribution device 34 .
  • a holding arm 74 pointing obliquely upwards is formed approximately centrally on the first branch line 54 and can be used to detachably hold the first branch line 54 on the intermediate wall 24 .
  • the first branch line 34 dips into the suction port 42 with an end region 76 facing away from the liquid distribution device 34 .
  • the propulsion nozzle 56 is detachably held at this end region 76 .
  • the driving nozzle 56 is designed as a full cone spray nozzle. Like in particular figure 5 becomes clear, the driving nozzle 56 has a nozzle cap 78, the interior space 80 of which accommodates the end region 76 of the first branch line 54, the nozzle cap 78 has an internal thread 82 which can be releasably screwed to a complementary external thread 84 of the end region 76 .
  • a sealing element in the form of a sealing ring 86 is used, which is arranged in an annular groove 88 of the end area 76 .
  • the interior 80 of the nozzle cap 78 has a conical end section 90, at the tip of which a nozzle outlet opening 92 is arranged.
  • a nozzle insert 94 Arranged in the conical end section 90 is a nozzle insert 94 which has a cylindrical base 96 which is adjoined by a frustoconical extension 98 in the direction of the nozzle outlet opening 92 .
  • the nozzle insert 94 is penetrated by a through-channel 100 which is aligned with the nozzle outlet opening 92 .
  • the nozzle outlet opening 92 and the through channel 100 are aligned collinear to a central axis 102 of the propulsion nozzle 56 .
  • the frustoconical extension 98 of the nozzle insert 94 has a lateral surface 104 which bears against the inner wall 106 of the conical end section 90 in a form-fitting manner.
  • Formed into the lateral surface 104 are four identical swirl channels 108 , each straight, which are distributed evenly over the circumference of the frustoconical extension 98 .
  • the longitudinal axes 109 of the swirl ducts 108 are skewed relative to the longitudinal axis 101 of the through-duct 100 .
  • the flow cross sections of the swirl channels 108 are larger than the flow cross section of the nozzle outlet opening 92.
  • the flow cross sections of the swirl channels are preferably also larger than the flow cross section of the through channel 100.
  • the swirl channels 108 have a U-shaped cross section.
  • the nozzle outlet opening 92 has a circular cross-section and the through-channel 100 also has a circular cross-section.
  • the diameter of the passage channel 100 can be 0.8 mm, for example, and the diameter of the nozzle outlet opening can be 0.7 mm, for example.
  • the conical end section 90 forms a conical swirl chamber 110 into which both the through channel 100 and the swirl channels 108 open.
  • the through-channel 100 aligned collinear to the central axis 102 opens centrally into the swirl chamber 110, whereas the swirl channels 108 open into the swirl chamber 110 offset laterally to the through-channel 100; figure 6 clearly.
  • the end region 76 of the first branch line 54 has at its free end three holding fingers 112, 113, and 114 which are arranged at equal angular distances from one another and face the conical end section 90 of the interior space 80.
  • a filter device in the form of a sieve 116 arranged, which is the nozzle insert 94 immediately upstream.
  • the nozzle insert 94 is supported on its rear side facing the first branch line 54 on supporting surfaces 118 of the holding fingers 112, 113, 114. The nozzle insert 94 is clamped between the support surfaces 118 and the inner wall 106 of the conical end section 90 and holds the screen 116 between the retaining fingers 112, 113, 114 in position.
  • the screen 116 is preferably made of metal, in particular steel, and/or a plastic material.
  • the mesh size of the screen 116 is at most 0.6 mm, preferably the mesh size of the screen 116 is at most 0.3 mm.
  • the screen 116 forms a filter or screen surface 120 through which pressurized cleaning fluid can flow.
  • the filter surface 120 is preferably cup-shaped or bell-shaped or convexly curved.
  • cleaning liquid under pressure can be applied to the surface 12 to be cleaned by means of the cleaning nozzle arrangement 60 .
  • the applied liquid can then be sucked up by means of the jet pump 44 together with the dirt that has been cleaned off and discharged via the suction connection 42 and the outlet line 14 .
  • the propulsion nozzle 56 can be supplied with pressurized cleaning liquid via the first branch line 54 , with part of the supplied cleaning liquid flowing through the through channel 100 and another part of the supplied cleaning liquid flowing through the swirl channels 108 . In this way, the cleaning liquid reaches the swirl chamber 110, from which the cleaning liquid is discharged via the nozzle outlet opening 92 in the form of a full cone jet.
  • the flow cross section of the nozzle outlet opening 92 is smaller than the flow cross section of the through channel 100 and also smaller than the flow cross section of the swirl channels 108.
  • the flow cross section of the nozzle outlet opening 92 is at most one third, in particular at most one fifth, of the sum of the flow cross sections of the through channel 100 and the swirl channels 108.
  • the flow rate of the cleaning liquid that can be fed to the driving nozzle 56 via the first branch line 54 is smaller than the flow rate of the cleaning liquid that can be fed to the at least one cleaning nozzle 62, 64 via the second branch line 58.
  • the flow rate of the cleaning liquid that can be supplied to the propulsion nozzle 56 via the first branch line 54 is at most 50% of the flow rate via the second Branch line 58 the cleaning nozzles 62, 64 feedable cleaning liquid.
  • pressurized cleaning liquid is discharged from the motive nozzle 56 in the form of a full cone jet.
  • the driving nozzle 56 consequently forms a full cone spray nozzle.
  • the nozzle parameter of the driving nozzle 56 is 0.18 l/min to 0.35 l/min, in particular 0.18 l/min to 0.28 l/min, at a reference pressure of 1 bar.
  • the jet pump 44 has a high suction efficiency, ie it enables a strong suction flow to be formed with a relatively small consumption of pressurized cleaning liquid. About one third of the cleaning liquid that is provided to the surface cleaning head 10 is used to generate the suction flow and about two thirds of the cleaning liquid that is provided to the surface cleaning head 10 is sprayed onto the surface 12 .

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  • Cleaning By Liquid Or Steam (AREA)
EP22191732.1A 2021-09-02 2022-08-23 Tête de nettoyage pour surfaces Pending EP4144442A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021122708.9A DE102021122708A1 (de) 2021-09-02 2021-09-02 Flächenreinigungskopf

Publications (1)

Publication Number Publication Date
EP4144442A1 true EP4144442A1 (fr) 2023-03-08

Family

ID=83050089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22191732.1A Pending EP4144442A1 (fr) 2021-09-02 2022-08-23 Tête de nettoyage pour surfaces

Country Status (3)

Country Link
EP (1) EP4144442A1 (fr)
CN (1) CN115722477A (fr)
DE (1) DE102021122708A1 (fr)

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EP2883618B1 (fr) * 2013-12-11 2020-10-28 Lechler GmbH Tuyère d'injecteur
GB2537605A (en) * 2015-04-15 2016-10-26 Techtronic Ind Co Ltd Cleaning apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022128567A1 (de) 2022-10-27 2024-05-02 Alfred Kärcher SE & Co. KG Flächenreinigungskopf

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