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WO1998006514A1 - Appareil de nettoyage haute pression - Google Patents

Appareil de nettoyage haute pression Download PDF

Info

Publication number
WO1998006514A1
WO1998006514A1 PCT/EP1996/003528 EP9603528W WO9806514A1 WO 1998006514 A1 WO1998006514 A1 WO 1998006514A1 EP 9603528 W EP9603528 W EP 9603528W WO 9806514 A1 WO9806514 A1 WO 9806514A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
line
section
suction
cross
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.)
Ceased
Application number
PCT/EP1996/003528
Other languages
German (de)
English (en)
Inventor
Johann G. Wesch
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
Priority to PCT/EP1996/003528 priority Critical patent/WO1998006514A1/fr
Publication of WO1998006514A1 publication Critical patent/WO1998006514A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • 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
    • B08B2203/0205—Bypass pressure relief valves

Definitions

  • the invention relates to a high-pressure cleaning device with a high-pressure pump for a cleaning liquid, a pressure line leading from the latter to a delivery point and with an injector in the pressure line which produces a constriction and which has a suction or control line branching off in the vacuum region.
  • Such high-pressure cleaning devices are known for example from DE 32 48 622 C2.
  • An injector in the pressure line which practically represents a constriction with subsequent widening, creates a negative pressure in the region of the constriction when a liquid flows through the pressure line.
  • This negative pressure is used to either suck in chemicals in a line branching off in this area or to use this negative pressure for control purposes, for example for displacing a control piston for a bypass line.
  • the parabolic cross-sectional widening is preceded by a flow path with a constant cross-section, which is also downstream of the branch of the intake or control line.
  • the injector therefore does not expand immediately after the suction or control line has branched off, but rather the expansion only begins downstream of this branch.
  • the length L 2 over which the cross-section of the pressure line widens parabolically, corresponds to six to fifteen times the diameter d 2 of the pressure line immediately downstream of the branching of the suction or control line.
  • the length L lf over which the constant cross section of the pressure line extends between the branching of the intake or control line and the beginning of the parabolic extension zero to six times the diameter d 2 of the pressure line immediately downstream of the branching of the intake - or control line.
  • a further reduction in flow losses can be achieved if the cross-section of the pressure line upstream of the branch of the suction or control line is reduced in a parabolic direction, this effect having a significantly less influence on the size of the flow.
  • loss of loss has the form of the cross-sectional expansion downstream of the branch of the intake or control line.
  • Figure 1 is a schematic longitudinal sectional view of the essential parts of a high-pressure cleaning device with an injector in the area of an intake line and a control line and
  • Figure 2 is a longitudinal sectional view through a special embodiment of an injector.
  • the pump head 1 of a high-pressure cleaning device shown in longitudinal section in FIG. 1 comprises a plurality of pumping chambers 2, of which only one is shown in the drawing. These are connected via an inlet valve 3 to a suction line 4 and via an outlet valve 5 to a pressure line 6.
  • a piston 7 is immersed in the pump chamber, which piston can be displaced reciprocally by a drive (not shown in the drawing), so that the volume of the Pump chambers 2 changes periodically.
  • the pressure line leads via a check valve 8 to an injector 9, which essentially has a section 10 which narrows in cross section, a section 11 adjoining it downstream with a constant cross section, and subsequently a widening section 12 downstream thereof.
  • a high-pressure line (not shown in the drawing) can be connected downstream of the injector 9, for example by screwing a union nut onto an external thread 13.
  • a suction line 15 which is closed by a check valve 14, branches off from the pressure line 6 and leads to a chemical supply (not shown in the drawing), for example to a cleaning chemical.
  • a control line 16 branches off in section 11, which leads to a control chamber 17.
  • This control chamber 17 is formed by a cavity 18 in the pump head 1, which is divided into two chambers by a piston 19 which is displaceably mounted in this cavity 18 and is sealed with respect to this, namely the control chamber 17 and the other a further control chamber 20 which is connected to the Pressure line 6 upstream of the check valve 8 is connected via a connecting line 21.
  • the piston 19 is connected to a valve body 22 which, depending on the position of the piston 19 Bypass line 23 opens or closes, which leads from the control chamber 20 to the suction line 4.
  • cleaning liquid is pumped from the pump chamber 2 into the pressure line 6 under high pressure and reaches a delivery point, for example a spray lance, via the connected high pressure line.
  • a delivery point for example a spray lance
  • the flow is accelerated by the constriction, and this leads to a drop in pressure in this area.
  • This pressure reduction is used to suck in chemical via the suction line 15 and to reduce the pressure in the control chamber 17.
  • the reduction of this pressure in the control chamber 17 leads to the piston being displaced into the closed position of the bypass line 23 under the effect of the higher pressure in the control chamber 20.
  • FIG. 9 A new and special cross-sectional shape of an injector 9 is shown in FIG.
  • This injector 9 has a narrowing section 10 in which the cross-sectional shape decreases in a parabolic manner, that is to say in cross-section the contour of the delimiting inner wall is parabolic.
  • the cross-section of the pressure line widens in the form of a step 25, and this step 25 is followed by section 11 with a constant diameter.
  • the suction line 15 and the control line 16 branch off from the section 11 transversely to the direction of flow.
  • Section 11 with a constant cross-section is followed by a section 12 with a widening cross-section, the contour of the delimiting wall being described in cross-section by a parabola which merges into section 11 with a constant cross-section parallel to the direction of flow and without changing direction.
  • d, Cd- ,.
  • C is a coefficient between 1.0 and 1.4.
  • the length of the section 11 with a constant cross section is denoted by h-
  • the length of the section 12 which widens parabolically is denoted by L 2 .
  • the length L is usually zero to six times as large as the diameter d 2 of the section 11, the length L 2 is usually six to fifteen times as large as d 2 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

L'invention concerne un appareil de nettoyage haute pression comportant une pompe haute pression pour un liquide de nettoyage, une conduite sous pression (6) menant de la pompe à un point de distribution, ainsi qu'un injecteur (9) placé dans la conduite sous pression (6), qui produit un rétrécissement et comporte une conduite d'aspiration ou de commande (15, 16) présentant une ramification dans la zone de dépression. L'invention vise à minimiser les pertes d'écoulement dans l'injecteur (9). A cet effet, la section transversale de l'injecteur (9) s'élargit de façon parabolique en aval de la ramification de la conduite d'aspiration ou de commande (15, 16).
PCT/EP1996/003528 1996-08-09 1996-08-09 Appareil de nettoyage haute pression Ceased WO1998006514A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP1996/003528 WO1998006514A1 (fr) 1996-08-09 1996-08-09 Appareil de nettoyage haute pression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1996/003528 WO1998006514A1 (fr) 1996-08-09 1996-08-09 Appareil de nettoyage haute pression

Publications (1)

Publication Number Publication Date
WO1998006514A1 true WO1998006514A1 (fr) 1998-02-19

Family

ID=8166282

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/003528 Ceased WO1998006514A1 (fr) 1996-08-09 1996-08-09 Appareil de nettoyage haute pression

Country Status (1)

Country Link
WO (1) WO1998006514A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1074731A1 (ru) * 1982-05-28 1984-02-23 Государственный Научно-Исследовательский Институт Строительных Материалов И Изделий Устройство дл приготовлени технической пены
DE3248622A1 (de) * 1982-12-30 1984-07-12 Alfred Kärcher GmbH & Co, 7057 Winnenden Hochdruckreinigungsgeraet
US4545317A (en) * 1981-04-01 1985-10-08 Gkss-Forschungszentrum Geesthacht Gmbh Device for treating the surfaces of structures and ships
WO1988001912A1 (fr) * 1986-09-16 1988-03-24 Westergaard, Knud, Erik Dispositif d'ejection de liquide sous haute pression destine en particulier a des fins de nettoyage
DE3724386A1 (de) * 1987-07-23 1989-02-09 Kaercher Gmbh & Co Alfred Hochdruck-reinigungsgeraet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4545317A (en) * 1981-04-01 1985-10-08 Gkss-Forschungszentrum Geesthacht Gmbh Device for treating the surfaces of structures and ships
SU1074731A1 (ru) * 1982-05-28 1984-02-23 Государственный Научно-Исследовательский Институт Строительных Материалов И Изделий Устройство дл приготовлени технической пены
DE3248622A1 (de) * 1982-12-30 1984-07-12 Alfred Kärcher GmbH & Co, 7057 Winnenden Hochdruckreinigungsgeraet
WO1988001912A1 (fr) * 1986-09-16 1988-03-24 Westergaard, Knud, Erik Dispositif d'ejection de liquide sous haute pression destine en particulier a des fins de nettoyage
DE3724386A1 (de) * 1987-07-23 1989-02-09 Kaercher Gmbh & Co Alfred Hochdruck-reinigungsgeraet

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED Section PQ Week 8442, 28 November 1984 Derwent World Patents Index; Class P64, AN 84-261893-42, XP002021799 *

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