EP0407812A1 - Appareil pour le nettoyage haute pression - Google Patents

Appareil pour le nettoyage haute pression Download PDF

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Publication number
EP0407812A1
EP0407812A1 EP90112196A EP90112196A EP0407812A1 EP 0407812 A1 EP0407812 A1 EP 0407812A1 EP 90112196 A EP90112196 A EP 90112196A EP 90112196 A EP90112196 A EP 90112196A EP 0407812 A1 EP0407812 A1 EP 0407812A1
Authority
EP
European Patent Office
Prior art keywords
pressure
line
bypass line
closing valve
outlet
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.)
Withdrawn
Application number
EP90112196A
Other languages
German (de)
English (en)
Inventor
Jürgen Binder
Helmut Gassert
Roland Schick
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 EP0407812A1 publication Critical patent/EP0407812A1/fr
Withdrawn legal-status Critical Current

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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
    • 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, a pressure line leading from the latter to a closable outlet, a bypass line leading from this to the suction side of the pump, and a closing valve closing the bypass line.
  • Such a high-pressure cleaning device is known from DE-PS 32 48 622.
  • the flow monitor releases the bypass line when the outlet is closed, so that the liquid conveyed by the high-pressure pump can in this case be conveyed through the bypass line in the circuit.
  • the high-pressure pump runs continuously regardless of whether the pressure line is open or closed.
  • bypass lines of this type are also provided, however, when in normal operation, in which the outlet is open, part of the liquid delivered by the pump is passed through a bypass line to meter the amount of liquid dispensed, while the rest is passed through the outlet is delivered normally. It is an object of the invention to enable automatic shutdown of the high pressure pump when the outlet is closed in such an arrangement.
  • a flow monitor is provided upstream of the outlet and downstream of the branching of the bypass line, which closes the closing valve of the bypass line when the outlet is closed.
  • the bypass line is not opened in this arrangement, but closed when the outlet is closed, ie when no liquid flows through the outlet.
  • this inevitably results in an increase in pressure, which leads to the automatic shutdown of the high-pressure pump via a pressure switch in a manner known per se. If the outlet is opened again, the pressure drops so that the high pressure pump switches on again. Via the flow monitor, this also leads to the bypass line being opened again, so that part of the liquid conveyed by the pump is circulated through the bypass line.
  • the cross-section of the bypass line for example, the amount dispensed can be metered in this way.
  • the flow monitor comprises a control piston actuating the closing valve, the control piston on one side from the liquid in a region of the pressure line with a narrowed cross-section and on the other side from the liquid in the pressure line in a region upstream is applied to the constriction, so that the control piston closes the closing valve of the bypass line when the pressure difference on both sides of the control piston falls below a certain value.
  • a very particularly advantageous embodiment is obtained when the closing valve is a metering valve and when an adjustable stop is provided with which the opening movement of the closing valve can be limited.
  • the closing valve simultaneously assumes the function of metering the amount of liquid flowing back through the bypass line, since the amount of liquid flowing back through the bypass line is reduced if the closing valve is only partially opened.
  • the stop can preferably be formed by a screw spindle.
  • the pressure line is adjoined on one side by a cylindrical control space which is divided by the control piston into two chambers, one of which is directly connected to the pressure line, while the other with the narrowed area of the pressure line in Connection is established that the bypass line branches off from the pressure line on the side opposite the control chamber and that a valve body which closes the bypass line and is held on the control piston passes through the pressure line.
  • the closing valve can be designed as a needle valve.
  • the drawing shows a longitudinal sectional view through the cylinder head of a high-pressure piston pump with bypass line and automatically operating closure device for the bypass line.
  • a high-pressure pump in the drawing, only a part of a high-pressure pump is shown, as is usually used in high-pressure cleaning devices, for example, it can be a swash plate pump with a plurality of pistons 1, which can be moved periodically in the axial direction and which each immerse in a pump chamber 2 of a cylinder head 3.
  • a suction line 5 opens into the pump chamber 2, which is closed by means of a spring-loaded suction valve 4 and can be opened in the inlet direction.
  • a line 6 leads from the pump chamber 2 to a pressure line 7, a spring-loaded pressure valve 8, which can be opened in the outlet direction against the action of the spring load, being arranged in the transition region from line 6 to line 7.
  • the pressure line 7 leads to a pressure-side outlet 9, to which, for example, a spray lance is connected via a flexible high-pressure hose, not shown in the drawing, which can be closed by means of a closing valve.
  • a bypass line 10 branches off from the pressure line 7 downstream of the pressure valve 8 and is connected to the suction line 5.
  • a valve seat 11 is screwed into the bypass line 10, which has a cylindrical passage opening 12 with a small cross section.
  • a needle-shaped valve body 13 interacts with this through-opening 12, which passes through the pressure line 7 vertically and is mounted in the cylinder head 3 so as to be displaceable in the longitudinal direction of the through-opening 12.
  • a cylindrical control chamber 14 is arranged on the side of the pressure line 7 opposite the bypass line 10, which is connected to the pressure line 7 and which is moved from a longitudinally displaceable control piston 15 into a first chamber 16 facing the pressure line 7 and in a second chamber 17 facing away from it is divided.
  • the control piston 15 is sealed off from the inner wall of the control chamber 14. It carries the valve body 13, which can be moved by the movement of the control piston 15 from the closed position closing the through opening 12 into an open position raised from the through opening 12. Downstream of the branching of the bypass line 10, a cross-sectional constriction 19 is provided in the pressure line 7, in the form of an injector-like insert 20. In the region of the narrowest cross-section, a control line 21 branches off radially from the pressure line constricted in this way, via a connecting line 22 in the cylinder head communicates with the second chamber 17 of the control chamber 14.
  • the control chamber 14 is closed on the side facing the chamber 17 by a sealing plug 23, which is screwed sealed and screwed into a corresponding internal threaded hole in the control chamber 14.
  • a spindle 24 is sealed, which is arranged coaxially to the longitudinal axis of the control chamber 14 and passes through the sealing plug 23.
  • the spindle At its end 25 protruding from the sealing plug 23 on the outside, the spindle carries a handle 26 by means of which it can be screwed more or less deeply into the sealing plug 23, so that its opposite end 27 is more or less deep into the chamber 17 of the control chamber 14 immersed and thus forms a variable stop for the control piston 15, the displacement thereof in the direction of the opening of the through opening 12 is thereby more or less limited.
  • the pump conveys liquid to the outlet 9 via the line 6 and the pressure line 7.
  • the chamber 16 facing the pressure line 9 has the static pressure of the liquid conveyed, in the opposite chamber 17 on the other hand, the pressure reduced by the constriction and due to the flow of the liquid, which is established in the constriction area.
  • the control piston 15 As a result of this pressure difference on the control piston 15, the latter is displaced in the direction of the chamber 17, so that the valve body 13 is lifted from the through opening 12 and the bypass line 10 is released. How far the valve body 13 moves from the valve seat 11 depends on how deep the spindle 24 is screwed into the sealing plug 23, ie the opening movement the valve body is limited by the spindle 24 at different heights above the through opening 12.

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  • Details Of Reciprocating Pumps (AREA)
EP90112196A 1989-07-12 1990-06-27 Appareil pour le nettoyage haute pression Withdrawn EP0407812A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3922956A DE3922956A1 (de) 1989-07-12 1989-07-12 Hochdruckreinigungsgeraet
DE3922956 1989-07-12

Publications (1)

Publication Number Publication Date
EP0407812A1 true EP0407812A1 (fr) 1991-01-16

Family

ID=6384843

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90112196A Withdrawn EP0407812A1 (fr) 1989-07-12 1990-06-27 Appareil pour le nettoyage haute pression

Country Status (2)

Country Link
EP (1) EP0407812A1 (fr)
DE (1) DE3922956A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0591660A1 (fr) * 1992-10-06 1994-04-13 Alfred Kärcher GmbH & Co. Appareil pour la nettoyage haute pression
EP0608796A1 (fr) * 1993-01-22 1994-08-03 WAP Reinigungssysteme GmbH & Co. Distributeur de pression/aspiration d'un appareil de nettoyage à haute pression avec valve de commande additionelle
EP0734791A1 (fr) * 1995-03-30 1996-10-02 Kew Industri A/S Appareil de nettoyage à haute pression avec valve de dérivation pour la pompe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9313929U1 (de) * 1993-09-15 1994-10-27 Wap Reinigungssysteme Gmbh & Co, 89287 Bellenberg Ventilblock mit Dampfstufe
EP0892174B1 (fr) 1997-07-17 2001-10-31 Jürgen Weigel Tête de pompe pour pompe à piston
DE29716906U1 (de) * 1997-07-17 1997-11-20 Eberherr, Herbert, 97638 Mellrichstadt Pumpenkopf für eine Hub-Kolbenpumpe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3608824A (en) * 1970-03-30 1971-09-28 Lennawill Inc High-pressure washing equipment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2722353B2 (de) * 1977-05-17 1980-06-04 Oberdorfer, Guido, 7919 Bellenberg Hochdruckreinigungsgerat mit einem Ventil zur Einstellung der Abgabemenge
DE3248622C2 (de) * 1982-12-30 1985-10-17 Alfred Kärcher GmbH & Co, 7057 Winnenden Hochdruckreinigungsgerät
DE3530954A1 (de) * 1985-08-29 1987-03-12 Oberdorfer G Wap Masch Hochdruck-reinigungsgeraet

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3608824A (en) * 1970-03-30 1971-09-28 Lennawill Inc High-pressure washing equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0591660A1 (fr) * 1992-10-06 1994-04-13 Alfred Kärcher GmbH & Co. Appareil pour la nettoyage haute pression
EP0608796A1 (fr) * 1993-01-22 1994-08-03 WAP Reinigungssysteme GmbH & Co. Distributeur de pression/aspiration d'un appareil de nettoyage à haute pression avec valve de commande additionelle
EP0734791A1 (fr) * 1995-03-30 1996-10-02 Kew Industri A/S Appareil de nettoyage à haute pression avec valve de dérivation pour la pompe
US5735461A (en) * 1995-03-30 1998-04-07 Kew Industri A/S High-pressure cleaner with bypass valve for the pump

Also Published As

Publication number Publication date
DE3922956C2 (fr) 1991-12-19
DE3922956A1 (de) 1991-01-17

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