EP0618362B1 - Regel- und Steuervorrichtung für eine Flüssigkeits-Druckerhöhungsanlage - Google Patents

Regel- und Steuervorrichtung für eine Flüssigkeits-Druckerhöhungsanlage Download PDF

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Publication number
EP0618362B1
EP0618362B1 EP94100026A EP94100026A EP0618362B1 EP 0618362 B1 EP0618362 B1 EP 0618362B1 EP 94100026 A EP94100026 A EP 94100026A EP 94100026 A EP94100026 A EP 94100026A EP 0618362 B1 EP0618362 B1 EP 0618362B1
Authority
EP
European Patent Office
Prior art keywords
pressure
piston
piston rod
cylinder
switch
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.)
Expired - Lifetime
Application number
EP94100026A
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German (de)
English (en)
French (fr)
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EP0618362A1 (de
Inventor
Helmut Stöger
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Individual
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Individual
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Publication date
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Publication of EP0618362A1 publication Critical patent/EP0618362A1/de
Application granted granted Critical
Publication of EP0618362B1 publication Critical patent/EP0618362B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/022—Stopping, starting, unloading or idling control by means of pressure
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/08—Pressure difference over a throttle

Definitions

  • Such regulating and control devices are known.
  • a pressure switch with a large ON-OFF switching differential which goes, for example, at a pressure of 150 bar in the OFF position and a pressure of 20 bar in the ON position (or by using two separately set pressure switches for the switch-on and the switch-off process)
  • these at least to a limited extent eliminate the problem of short-period switch-on and switch-off processes (go-and-stop operation).
  • the pressure booster systems generally do not contain any storage components, such as a gas-laden storage container. In this sense, practically only hose connections that may exist in the system, which slightly expand the enclosed volume when the pressure increases due to expansion of the walls. If the pump has the working fluid at a nominal pressure of e.g.
  • a known attempt to solve this problem is to use a specially designed relief valve which contains a limit switch which is controlled by the valve spindle, which is movable in a pressure-dependent manner against the valve spring.
  • the limit switch switches off the motor for a given, generally small spindle stroke. Since the spindle responds even with small pressure changes and thus also causes the pressure switch to change its switching state, the motor is continuously switched on and off. Again, it is known to counteract this switching on and off by means of a further pressure switch.
  • a plurality of pressure switches is therefore required, to which a contactor is added, since the force available on the spindle of the relief valve is only sufficient to drive an auxiliary limit switch.
  • the object of the invention is to develop a regulating and control device of the type mentioned in such a way that there is no longer-lasting circulation promotion and thus overheating of the working fluid and it is unnecessary to make the pressure switch operationally adjustable with regard to its switch-off pressure or to also have to readjust the pressure switch if this is used to adjust the pressure at the pressure outlet of the System used relief valve is changed in its pressure setting.
  • a water heater for heating the permeated working fluid in a system of the type mentioned at the outset, which can contain, for example, an oil burner as the heat source.
  • a minimum amount of working fluid is also passed through, ie. H.
  • Working fluid escapes at the pressure outlet of the system (e.g. at the spray nozzle of a manual valve).
  • this problem is solved in that a limit switch with one of its actuating levers in the movement path the third piston-piston rod unit fixed cam is arranged that the cam brings the limit switch to the ON position when this piston-piston rod unit is at or near its outer limit position, which corresponds to the system at the outer stop and that electrical connections of the water heater are connected in series with the electrical connections of the limit switch and the pressure switch to the mains or a main switch.
  • the electrical connections of the water heater are connected to a time switch, which in turn are connected in series with the electrical connections of the limit switch and pressure switch and that the time switch applies voltage to the electrical connections of the water heater with a time delay after its own excitation.
  • the indication "stationary" means that the position of a component in the operating state of the device is fixed in relation to the switch frame of the pressure switch.
  • “Working liquid” or “liquid” is to be understood as the liquid which has passed through the system and is delivered to its pressure outlet, which liquid generally consists of water which can contain additives such as cleaning agents or the like.
  • the pressure generating unit 1 (Fig. 1) contains a pump 5 driven by a motor 4 with a suction port 6 and a pressure port 7.
  • the suction port 6 is acted upon by the working fluid.
  • the working fluid is usually supplied with a relatively low pressure (a few bar), for example by connecting to a drinking water supply network.
  • a safety valve (pressure relief valve) 8 is switched on, which is set to a trigger pressure p-ü of 165 bar.
  • the pressure generating unit 1 can also contain a water heater 9, which serves to heat the working fluid and which preferably has an oil burner as the heat source 10.
  • the heat source is switched on by applying a voltage to its electrical connections 11a, 11b.
  • the water heater 9 is advantageously arranged such that the working fluid flows through it as one of the last components before it leaves the valve assembly 2 and thus the entire system at its pressure outlet 12.
  • the valve assembly 2 (FIGS. 1 and 3) is connected with its pressure inlet 7a to the pressure connection 7 of the pressure generating unit 1. It contains, one after the other in the flow direction of the working fluid, a check valve 13 connected to the pressure inlet and an outlet valve 14 connected to its outlet side 13a.
  • the outlet valve 14 serves to block or to release the pressure provided by the system at its pressure outlet 12, working fluid under high pressure.
  • the outlet valve is formed by a manual valve which is connected to the outlet side 13a of the check valve 13 via a hose 15 and which contains an actuating lever 16, a valve plug controlled thereby and a spray nozzle 17.
  • the outlet valve can also be designed differently, for example as a solenoid valve.
  • the valve assembly 2 also contains a relief valve 19, which with its inlet 20 to the pressure inlet 7a, with its control inlet 21 to the outlet side 13a of the check valve 13 and with its outlet 22 to the suction port 6 of the pressure generating unit 1 connected.
  • the relief valve contains a piston 23 displaceable in a cylinder bore, which a valve spring 24, which is adjustable in its force, prestresses in the direction of a first limit position and which, depending on its pressurization via the control inlet 21, counteracts the spring action in the direction of a second limit position is displaceable and thereby lifts a valve body 25 from its seat and opens a flow path for the working fluid from the inlet 20 to the outlet 22 and thus to the suction port 6.
  • the pressure switch unit 3 (Fig. 1 and Fig. 2) contains a pressure switch 26 (Fig. 2), which is designed for a large on-off difference, i.e. at a switch-on pressure p-1a of 20 bar, it transfers its movable contacts 26a to an ON position in which they establish a connection between its electrical connections 26b, 26c and it transfers at a switch-off pressure p-1b (nominal pressure of the system) from 150 bar to an OFF position.
  • the pressure desired by the operator at the pressure outlet 12 of the system is carried out by adjusting the relief valve (changing the tension of the valve spring 24). With such a pressure setting, it is not necessary to adjust the pressure switch 26 accordingly or to make it operationally adjustable.
  • the pressure switch 26 has a first cylinder-piston arrangement, designated 27 in its entirety, with a longitudinal axis A (which also defines the pressure switch longitudinal axis).
  • This arrangement contains a first cylinder 29 fixed to the switch frame 28, which in the area of its otherwise closed bottom has a first pressure connection 30 for the application of the working liquid, which is connected to the outlet side 13a of the check valve 13.
  • the cylinder 29 In the area of its free cylinder end facing away from the ground, the cylinder 29 is connected to the free atmosphere.
  • a piston 31 is displaceable in the cylinder and is fixedly connected to a piston rod 32, which is designed as a fork-shaped body 33 at its free end.
  • the stroke of the piston-piston rod unit 31, 32 is limited by an inner stop which defines a first limit position and which is formed by the contact of the body 33 with the free end of the cylinder 29.
  • the body 33 In the event of a movement starting from the inner stop, the body 33, after a predetermined free stroke, strikes a prestressed, strong working spring 34 supported on the switch frame 28 (hereinafter referred to as the first spring) is biased in the direction of a first limit position and which, via a snap arrangement 37, drives a contact carrier 38 which holds the movable contacts 26a and is movably mounted in the switch frame.
  • the intermediate member 35 is pressed by the first spring 36 onto rollers 39 supported by the body 33.
  • the pressure switch assembly 2 further comprises a second cylinder-piston arrangement, designated 40 in its entirety, with a longitudinal axis B.
  • a relief opening 46 is provided in the area of the free cylinder end 45 facing away from the floor.
  • a second piston 47 is displaceable in the cylinder 42 and is fixedly connected to a piston rod 48. The stroke of the second piston-piston rod unit 47, 48 is limited by an outer stop 49 in the direction of the free cylinder end and an inner stop 50 in the direction of the cylinder bottom 43.
  • a second spring 51 is fixedly supported at one end and, at the other end, biases the second piston-piston rod unit 47, 48 in the direction of the cylinder base 43, that is to say the inner stop 50.
  • This spring is designed in such a way that the piston-piston rod unit 47, 48 is present at the inner stop 50 up to a second lower pressure p-2a of approx. 38 bar at the pressure connection 44, and lifts off from this stop when the pressure increases further, and is in Moved towards the outer stop 49 and comes to bear against the outer stop at a second upper pressure p-2b of 40 bar.
  • the piston-piston rod unit remains in its position specified by the outer stop, this stop 49 absorbing the force exerted by the piston 47.
  • the pressure switch assembly 2 further comprises a third cylinder-piston arrangement, designated in its entirety by 52, with a longitudinal axis C.
  • This contains a stationary third cylinder 53, which has a pressure connection 55 in the otherwise closed area of its base 54. Has exposure to the working fluid, which is connected to the pressure inlet 7 a of the valve assembly 2.
  • a relief opening 57 is provided which is connected to the free atmosphere.
  • a third piston 58 is displaceable in the cylinder 53 and is fixedly connected to a piston rod 59.
  • An external stop 60 in the direction of the free cylinder end and an inner stop 61 in the direction of the cylinder base 54 limit the stroke of the third piston-piston rod unit 58, 59.
  • a third spring 62 is fixedly supported at one end and biases the third piston-piston rod unit 58, 59 towards the cylinder bottom 54, ie towards the inner stop 61, at its other end.
  • This spring is designed such that the piston-piston rod unit 58, 59 is present at the inner stop 61 up to a third lower pressure p-3a of approx moves in the direction of the outer stop 60 and at a third upper pressure p-3b of 30 bar comes to bear against the outer stop.
  • the piston-piston rod unit remains in the position predetermined by the outer stop, this stop absorbing the force exerted by the piston 58.
  • the free end of the second and third cylinders 42/53 is provided with a cover 63/64, in the central bore of which the piston rod 48/59 is guided and the spring 51/62 is designed as a helical compression spring , which, surrounding the piston rod 48/59, is clamped between the inside of the cover and the piston 47/58.
  • the inner stop 50/61 is formed by a central projection on the bottom of the piston which can come to bear on an inner surface of the cylinder bottom 43/54 and it is the outer stop 49/60 by a member projecting from the inner wall of the cylinder 65/66 formed (e.g. a sleeve surrounding the spring and supported on the cover) on which the piston can come to rest.
  • the longitudinal axes A, B, C of the first, second and third cylinder-piston arrangements 27/40/52 lie in a common longitudinal plane and run parallel to one another. All three cylinder-piston arrangements 27/40/52 are directed in the same direction, i.e. their piston-piston rod units 31.32 / 47.48 / 58.59 move in the same direction when the pressure is increased.
  • the pressure switch unit also comprises a gear arrangement, designated in its entirety by 67, which is driven by the second piston-piston rod unit 47, 48 and by the third piston-piston rod unit 58, 59.
  • the gear arrangement 67 contains a movable trigger member 68 which has a pressure surface 69 which can be moved from the gear arrangement 67 from a first inactive limit position to a second active limit position (and back).
  • the pressure surface 69 or the release member 68 is outside and in the active limit position within the movement path of the intermediate member 35 of the pressure switch 26.
  • the arrangement is also such that the pressure surface 69 moves from the inactive to the active limit position can exert on the intermediate member 35 by exerting a compressive force N and can move it towards its second limit position at least to such an extent that the snap arrangement 37 transfers the movable contacts 26a to the OFF position, ie acts on the intermediate member in the same way as the first piston-piston rod unit 31, 32 by means of its rollers 39.
  • the intermediate member 35 lifts off the rollers 39 so that it, without the pistons Need to drag the piston rod unit 31, 32 only by overcoming the sum of the forces exerted by the first spring 36 and the snap arrangement 37 on the intermediate member.
  • the basic function of the gear arrangement 67 is that it determines the position of the trigger member 68 depending on the position that the second and third piston-piston rod units 47, 48, 59, 60 assume. More precisely, the transmission arrangement transfers the triggering member into the aforementioned active limit position only when the second piston-piston rod unit 47, 48 is located on its outer stop 49 (or is immediately adjacent to it) and the third piston Piston rod unit 59,60 bears against its inner stop 61 (or is directly adjacent to it).
  • the trigger member 68 is then brought into the active limit position by the gear arrangement 67 and thereby brings the pressure switch 26 into its OFF position when the pressure on the outlet side 13a of the check valve 13 (which corresponds to the pressure at the system outlet valve 14) is equal to or greater than the upper second pressure p-2b of 40 bar, in any case greater than the lower second pressure p-2a of 38 bar and if as a second condition the pressure at the pressure inlet 7a Valve assembly 2 is equal to or less than the lower third pressure p-2a of 28.5 bar, in any case less than the upper third pressure p-2b of 30 bar.
  • a person skilled in the art is readily able, on the basis of the above-described mode of operation, to implement a gear arrangement 67 suitable for the invention.
  • a particularly simple embodiment of the gear arrangement 67 illustrated in FIG. 2 consists of a lever 70 which is fastened at its first end to the third piston rod 59 with a joint, the joint axis E of which is parallel to the pivot axis D of the intermediate member contained in the pressure switch 26 35 and perpendicular to the common longitudinal plane containing the longitudinal axes A, B, C of the three cylinder-piston arrangements.
  • the lever 70 can therefore perform a pivoting movement in the latter plane (practically the plane of the drawing in FIG. 2).
  • the pressure surface 69 which is designed to reduce friction as a roller 71 with an axis of rotation F parallel to the joint axis E.
  • the lever 70 therefore also forms the trigger member 68 with its region adjoining the free end.
  • a limit switch 73 for example a microswitch, is arranged with its actuating lever 74 in the movement path of a cam 75 fastened to the third piston-piston rod unit 58, 59 in such a way that it establishes a conductive connection between its electrical connections 73a, 73b when it is established the piston-piston rod unit has lifted from its inner stop 59 and is approaching its outer stop 60.
  • the limit switch 73 is therefore always brought into the ON position when the pressure in the third cylinder-piston arrangement 52 and thus the pressure at the pressure inlet 7a of the valve assembly 2 reaches the third lower pressure p-3a of FIG. Exceeds 5 bar.
  • a timer switch (timer relay) 76 is connected in series with the electrical connections 26b, 26c / 73a, 73b of the pressure switch 26 and the limit switch 73 to the mains or to a main switch. This timer is in turn connected to the electrical connections 11a, 11b of the heat source (oil burner) 10 of the water heater 9 in such a way that the heat source is only activated after a predetermined time delay after the timer 76 has received voltage, i. H. after the pressure switch 26 and the limit switch 73 have reached the ON position.
  • Has the first spring 36 a relative to the design of the pressure switch 26 cooperating with the gear arrangement 67 strong compressive force and / or the second cylinder-piston arrangement 40 is designed so that its compressive force is just sufficient to bring the intermediate member 35 into its second limit position via the transmission arrangement, an unstable equilibrium position of this cylinder-piston arrangement can be detrimental to affect the function.
  • the mentioned lability occurs when the value p-2b of 40 bar is reached when the second pressure drops and the hydraulic force on the piston 47 is in equilibrium with the force of the second spring 51 (force-free application of the second piston-piston rod unit 47.48 on the outer stop 49).
  • FIGS. 4 and 4A namely by means of a locking device, generally designated 77.
  • a two-armed angle lever 78 is provided as the locking device, which can be pivoted about a fixed joint axis G. This penetrates the angle lever near the junction of its two legs 78a and 78b.
  • the first leg 78a lies against the free end of the second piston-piston rod unit 47, 48.
  • the second leg 78b has at its free end a sliding surface 79 which bears on the contact surface 72 of the lever 70.
  • This contact surface 72 contains a section 72a, which as one of the boundary surfaces of a triangular notch of the lever 70 is formed.
  • the position and orientation of the section 72a and the position of the hinge axis G of the angle lever 78 is selected so that with a second piston-piston rod unit 47, 48 resting on the outer stop and a third piston-piston rod unit resting on the inner stop 61 58, 59 the sliding surface 79 on the second leg 78b touches the section 72a and that a straight line which is laid through the point of contact and through the hinge axis G is at least approximately perpendicular to the section.
  • the lever 70 is supported via the hinge axis G, so that the lever (regardless of whether the second piston-piston rod unit 47, 48 is in an unstable state) with its contact surface section 72a is articulated around the sliding surface 79 can rotate and its trigger member 68 brings into the active limit position (conditionally OFF position of the limit switch 26) when the third piston-piston rod unit 58, 59 moves to its inner stop 61.
  • a return spring (not shown in the drawing) or a non-positive or positive connection of the second leg to the second piston-piston rod unit causes the angle lever 78 to leave its locked position when it returns to the retracted position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP94100026A 1993-03-29 1994-01-03 Regel- und Steuervorrichtung für eine Flüssigkeits-Druckerhöhungsanlage Expired - Lifetime EP0618362B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4310155 1993-03-29
DE4310155A DE4310155C1 (de) 1993-03-29 1993-03-29 Regel- und Steuervorrichtung für eine Flüssigkeits-Druckerhöhungsanlage

Publications (2)

Publication Number Publication Date
EP0618362A1 EP0618362A1 (de) 1994-10-05
EP0618362B1 true EP0618362B1 (de) 1997-05-02

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EP94100026A Expired - Lifetime EP0618362B1 (de) 1993-03-29 1994-01-03 Regel- und Steuervorrichtung für eine Flüssigkeits-Druckerhöhungsanlage

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Country Link
US (1) US5464328A (ja)
EP (1) EP0618362B1 (ja)
JP (1) JPH0739831A (ja)
DE (2) DE4310155C1 (ja)

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US6302516B1 (en) * 1997-01-14 2001-10-16 Markem Corporation Ink supply system for ink jet printhead
US6247903B1 (en) * 1999-03-26 2001-06-19 Lam Research Corporation Pressure fluctuation dampening system
US6685440B2 (en) 2001-05-18 2004-02-03 Lam Research Corporation Methods of pressure fluctuation dampening
US6826356B1 (en) 2003-09-30 2004-11-30 Eugene C. Wanecski System and method for water heater protection
US8469677B1 (en) * 2007-10-01 2013-06-25 Sauer-Danfoss Inc. Check valve pump with electric bypass valve
US8052418B2 (en) 2008-09-05 2011-11-08 Energy Efficiency Solutions, Llc Oil burning system
CN102493949B (zh) * 2011-11-30 2015-04-15 中国科学院自动化研究所 消防车水泵控制系统
SG11201705793TA (en) * 2015-03-10 2017-08-30 Sonderhoff Eng Gmbh Method for compensating leakage losses and conveyor system for conveying a defined volume of a liquid

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Also Published As

Publication number Publication date
EP0618362A1 (de) 1994-10-05
DE59402584D1 (de) 1997-06-05
US5464328A (en) 1995-11-07
DE4310155C1 (de) 1994-06-30
JPH0739831A (ja) 1995-02-10

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