EP0041247B1 - Dispositif asservi pour réglage de débit indépendant de la charge - Google Patents

Dispositif asservi pour réglage de débit indépendant de la charge Download PDF

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Publication number
EP0041247B1
EP0041247B1 EP81104114A EP81104114A EP0041247B1 EP 0041247 B1 EP0041247 B1 EP 0041247B1 EP 81104114 A EP81104114 A EP 81104114A EP 81104114 A EP81104114 A EP 81104114A EP 0041247 B1 EP0041247 B1 EP 0041247B1
Authority
EP
European Patent Office
Prior art keywords
valve
pilot
main control
fluid flow
flow sensor
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
Application number
EP81104114A
Other languages
German (de)
English (en)
Other versions
EP0041247A3 (en
EP0041247A2 (fr
Inventor
Yung-Hsiang Lu
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0041247A2 publication Critical patent/EP0041247A2/fr
Publication of EP0041247A3 publication Critical patent/EP0041247A3/de
Application granted granted Critical
Publication of EP0041247B1 publication Critical patent/EP0041247B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0435—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being sliding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/03—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type with electrical control means

Definitions

  • the invention relates to a pilot-controlled device for load-independent volume flow control with a main control valve that regulates the volume flow between an inlet and an outlet, a pilot valve that acts on a control flow branched off from the volume flow for actuating the main control valve, and a force that is proportional to an input signal on the valve body of the pilot valve acting control device, and a arranged in the flow path between the inlet and outlet, designed as a spring-loaded, differential pressure-dependent opening valve designed volume flow sensor, the valve body position is returned by a spring against the force of the control device to the valve body of the pilot valve.
  • a load-independent volume flow control which has a control device which transmits a force proportional to an input signal to a pivotally mounted element.
  • This element acts on a pilot valve, which in turn controls a main control valve that has a slide that is not mechanically connected to the valve housing.
  • the pilot valve influences the pressures that act on the two end faces of the spool and possibly leads to a corresponding displacement of the spool.
  • an inlet is connected to a first or a second outlet by a control edge of a slider section, while at the same time the other outlet is connected to an outlet.
  • a volume flow sensor is provided in each of the two inlets, the valve body position of which is returned via a spring to the pivotably mounted element of the control device.
  • the known volume flow control requires a rather complicated construction and largely the use of components to be specially manufactured for this purpose.
  • the control loop must be regarded as susceptible to vibrations, and the response speed cannot meet high demands.
  • the object of the present invention is now to avoid the disadvantages of the previously known generic device and to achieve better direct current behavior with a compact design.
  • the main control valve is designed as a lift valve, the valve body of which is acted upon in the opening direction by a pressure in the flow path and in the closing direction by the force of a spring and the control pressure controlled by the pilot valve that the Valve body of the pilot valve is designed as a pilot piston, that the main control valve, the pilot valve and the volume flow sensor are arranged in a common housing, the valve body of the volume flow sensor and the pilot piston being displaceable coaxially with one another in aligned bores, and that the control device is arranged coaxially with the pilot piston acts on the pilot piston via a coaxial output member.
  • the embodiment of the invention according to FIG. 1 has a housing 1, which is composed of two parts 1, 3 which are sealingly connected to one another.
  • the housing 1 has an inlet 4 and an outlet 5.
  • inlet 4 and outlet 5 are formed by bores running parallel to one another.
  • the bore for the inlet 4 has an enlarged section 6 in the housing 1, in which a valve body 7 of a main control valve is slidably guided.
  • This valve body 7 is at its end facing the inlet 4 with a Conical surface 8 provided, which forms a control cross section with a valve seat 9 of the housing 1.
  • the expanded section 6 of the inlet bore is closed by a cover 10 at the end opposite the inlet 4.
  • a helical spring 11 is supported at one end on the cover 10 and at the other end on the valve body 7, which has a central cylindrical recess 12 which is open to the cover 10.
  • This cylindrical recess 12 forms with the space between the valve body 7 and the cover 10 the control pressure side 13 of the valve body 7, which is the main control valve of the device.
  • the valve body 7 has an end face 14 facing the inlet 4, in which a constant throttle 15 is provided, which represents a connection between the inlet 4 and the control pressure side 13 of the valve body 7.
  • a bore 16 is provided in the housing 1, which connects the inlet 4 to the outlet 5.
  • This bore 16 has an upper, enlarged section 17, in which a valve body 18 is slidably guided, which forms on its end face 19 a conical surface 20 which cooperates with a valve seat 21 of the housing 1.
  • the valve body 18 is similar to the valve body 7 of the main control valve is pot-shaped.
  • a helical spring 23 is provided on its rear side 22, one end of which is supported on the valve body 18 and the other end of which is supported on the housing 1.
  • Another coil spring 24 also engages with one end on the rear of the valve body 18, while its other end abuts a pilot piston 25.
  • the valve body 18 acts as a volume flow sensor of the device and is also referred to as such.
  • the pilot piston 25 is guided in a cylinder chamber 26. It has a control edge 27.
  • the control pressure side 13 of the valve body 7 acting as the main control valve is connected to the cylinder chamber 26 via a connecting line 8, in which there is a constant throttle 19. Furthermore, a line 30 opens into the cylinder space 26, which is connected to the outlet 5 via a line 31.
  • the control edge 27 of the pilot piston 25 controls the cross section of the connecting line 28 and, if appropriate, establishes a connection via the lines 30 and 31 to the outlet 5 via an annular space 32.
  • lines 33, 34 which act on both sides of pilot piston 25 with the pressure prevailing in outlet 5.
  • a control device 35 is placed on the housing 1, which receives a pressure-resistant proportional magnet 36.
  • a plunger 37 of this proportional magnet 36 acts on the pilot piston 25, the force transmitted by the plunger 37 being proportional to the current flowing through a winding of the proportional magnet 36.
  • An adjusting spring 38 acts on the rear side of the proportional magnet 36, the spring tension of which can be adjusted by means of a spindle 39 in order to be able to carry out a zero point adjustment of the pilot stage, that is to say the pilot piston 25.
  • valve body 7 If the proportional magnet 36 is not energized or if the magnetic force is not sufficient to overcome the pretension specified by the spring 24, the valve body 7 is seated on its valve seat 9 and the valve body 18 is seated on it 21. In this state, therefore, no volume flow flows from inlet 4 to outlet 5.
  • the control pressure on the control pressure side 13 of the main control valve 7 drops, and the valve body of the main control valve 7 is deflected by the pressure in the inlet 4 against the spring 11 and the control pressure on the control pressure side 13.
  • the control cross section on the valve body 7 is thus enlarged.
  • the volume flow over the control cross section of the main control valve 7 increases and deflects the valve body 18 of the volume flow sensor against the spring 23, 24.
  • the change in the spring force of the spring 24 leads on the pilot piston 25 to the force balance between the spring force and the control force of the tappet 37 as soon as the actual volume flow through the device corresponds to the desired value.
  • the opening stroke of the volume flow sensor 18 is kept constant by the position control. At the same time, however, the pressure difference across the opening cross section is constant for each volume flow set. This is determined by the spring forces of the springs 23, 24 and the effective flow forces. Since both the opening cross section at the volume flow sensor and the pressure difference at this cross section are constant, the volume flow flowing through must also be constant.
  • a valve body 51 main control valve is provided, the end face 52 of which is closed, that is to say has no throttle.
  • the control pressure side 53 is connected to the inlet 4 via a connecting line 54, which can be connected by a control edge 55 to a line 56 which opens into the inlet 4.
  • the pilot piston 25 has a second control edge 57, which can establish a connection between the control pressure side 53 of the main control valve 51 and the outlet 5.
  • the embodiment according to FIG. 4 has a two-part housing 60 with an inlet 61, an outlet 62 and a tank connection 63. This device therefore works as a 3-way flow control valve.
  • a valve body 64 as the main control valve and a valve body 65 as the volume flow sensor are arranged parallel to one another.
  • the valve body 64 of the main control valve has on its end face 66 a conical surface 67 which cooperates with a valve seat 68 of the housing.
  • the control cross section between the valve seat 68 and the conical surface 67 connects the inlet 61 to the tank connection 63.
  • a constant throttle 69 is located in the end face 66 of the valve body 64.
  • the valve body 64 is pot-shaped and has a control pressure side 70 which communicates with the inlet 61 via the throttle 69.
  • the control pressure side 70 is connected via a connecting line 71, in which there is expediently a further throttle 72, to a cylinder 73 in which a pilot piston 74 is guided.
  • the pilot piston 74 has a control edge 75 which controls the cross section of the connecting line 71.
  • the pilot piston 74 forms an annular space 76 into which a line 77 opens which, depending on the position of the control edge 75, communicates with the connecting line 71 and is connected to the tank connection 63.
  • a further control cross section is formed between the inlet 61 and the outlet 62 by a conical surface 78 of a volume flow sensor 79 and a valve seat 80 of the housing 60.
  • the volume flow sensor 79 designed as a valve body is supported on the pilot piston 74 via springs, as already described in the previous embodiments.
  • This pilot piston is pressure-balanced via lines 80, 81, 82.
  • the embodiment according to FIG. 5 differs from that according to FIG. 4 only in that the valve body 64 of the main control valve has no throttle in its end face 66, but that the control pressure side 70 of the main control valve is connected to the cylinder 73 of the pilot piston 74 via a connecting line 85 and there, controlled by a second control edge 86 of the pilot piston 74, communicates with a line 87 which, depending on the position of the pilot piston 74, establishes a connection between the control pressure side 70 and the inlet 4.
  • a second control edge 100 of the pilot piston 74 controls a connecting line 99 to the tank connection 63.
  • the control pressure side 13 of the main control valve is via a connecting line 90 in which a throttle 91 is arranged, connected to a cylinder 92 of a pilot piston 93.
  • a control edge 94 of this pilot piston 93 establishes a connection between the connecting line 90 and a further line 95, which ends in the space between the main control valve 7 and the volume flow sensor 18.
  • the rear of the volume flow sensor is connected to outlet 5 via a line with throttle 97.
  • a two-part housing 101 which has an inlet 102 and an outlet 103.
  • This embodiment has a valve body 104 as a volume flow sensor and a valve body 105 as a main control valve.
  • the main control valve is arranged differently from the previously described embodiments in the flow direction behind the volume flow sensor, the Ven til emotions is closed on its end face 106.
  • the valve body 104 of the volume flow sensor is, as described above for the other embodiments, supported by springs on the housing and on a pilot piston 109.
  • the valve body 105 of the main control valve has an end face 110 with a conical surface 111, which cooperates with a valve seat 112 of the housing.
  • a constant throttle 108 is provided in the end face 110.
  • the valve body 105 of the main control valve is cup-shaped and is supported on the housing via a spring 113.
  • the main control valve 105 has a control pressure side 114, which is connected via a connecting line 115 to a cylinder 116 of the pilot piston 109.
  • a further throttle 117 is located in the connecting line 115.
  • the pilot piston 109 has a control edge 118 which, depending on the position of the pilot piston 109, establishes a connection between the connecting line 115 and a further line 119 which opens into the space between the volume flow sensor 104 and the main control valve 105.
  • Lines 120, 121, 122 act on both sides of the pilot piston 109 with the pressure present at the inlet 102, so that the pilot piston 109 is relieved of pressure.
  • the control device 125 has a housing 126 with a bore 127 in which a pressure-balanced plunger 128 can be displaced, which protrudes out of the housing 126 at one end.
  • the plunger 128 forms a piston with a lower surface 129 and an upper surface 130. These surfaces lie in a cylinder section 131 of the bore 127.
  • the plunger 128 is provided with a blind bore 132 in which a helical spring 133 sits, one end of which bears against one another supports a pilot piston, as shown in FIGS. 1 to 7.
  • This control device thus enables a stroke actuation of the entire device and is suitable, for example, for actuation by control cams or the like.
  • FIG. 9 shows an embodiment of the control device 140 which corresponds very largely to that according to FIG. 8. The only difference is that the upper end of a plunger 141 in this embodiment lies in a cylinder space 142 to which an external control pressure can be applied.
  • control device 150 largely corresponds to that according to FIG. 8. The only difference is that a rotary spindle 152 works with the upper end of a plunger 151, which rotates the position of the plunger and thus that of a coil spring 153 force exerted on the pilot piston.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Fluid-Driven Valves (AREA)

Claims (7)

1. Dispositif asservi pour réglage de débit indépendant de la charge
comprenant
un distributeur principal (6-13) qui règle le débit entre une conduite d'amenée (4) et une conduite de sortie (5),
un distributeur pilote (25-27) qui agit sur un débit de commande branché du débit à fin d'actionner le distributeur principal,
un dispositif d'activation (35) qui agit sur le corps de valve (25) du distributeur pilote avec une force étant proportionnelle à un signal d'entrée, et comprenant un capteur de mesure de débit (17-23) qui est placé sur le trajet d'écoulement entre la conduite d'amenée (4) et la conduite de sortie (5) et qui est réalisé sous forme d'une valve à siège soumise à l'action d'un ressort et ouvrant en fonction de la pression différentielle, la position du corps de valve dudit capteur de mesure de débit étant renvoyée par un ressort (24) contre la force de dispositif d'activation (35) sur le corps de valve (25) du distributeur pilote, caractérisé par le fait
que le distributeur principal (6-13) est réalisé sous forme d'une valve à siège, dont le corps de valve (7) est soumis en sens de l'ouverture à l'action d'une pression du trajet d'écoulement et en sens de la fermeture à la force d'un ressort (11) et à l'action de la pression de commande commandée par le distributeur pilote (25-27),
que le corps de valve du distributeur pilote (25-27) a la forme d'un piston pilote (25),
que le distributeur principal (6-13), le distributeur pilote (25-27) et le capteur de mesure de débit (17-23) sont disposés dans une enveloppe (1) commune, le corps de valve (18) du capteur de mesure de débit et le piston pilote (25) pouvant se déplacer coaxialement l'un par rapport à l'autre dans des forages (16, 17; 26) alignés,
et que le dispositif d'activation (35) est disposé coaxialement par rapport au piston pilote (25)et agit sur le piston pilote (25) par l'intermédiaire d'un élément de transfert (37).
2. Dispositif selon la revendication 1,
caractérisé par le fait
que le côté de commande (13) du distributeur principal (6-13) est relié au côté d'amenée (4) du distributeur principal par une valve d'étranglement (15) constante
et que l'écoulement du liquide de commande du côté de commande (13) à un endroit (5) sous une pression plus basse est commandé par une arête pilotante (27) du piston pilote (25).
3. Dispositif selon la revendication 1,
caractérisé par le fait
que le distributeur pilote (25, 55, 57; 73, 74, 86, 100) est réalisé sous forme d'un distributeur à trois voies et deux positions par lequel la chambre de pression de commande (53; 70) du distributeur principal (51, 53; 64, 66, 70) peut être reliée au choix à la conduite d'amenée (4) ou à un endroit (5; 63) sous pression plus basse.
4. Dispositif selon la revendication 2,
caractérisé par le fait
que l'endroit sous pression plus basse est la conduite de sortie (5)
et qu'un clapet anti-retour (45) ouvrant en direction de la conduite de sortie (5) est placé dans la conduite (30, 31) raccordant le distributeur pilote (25-27) à la conduite de sortie (5)
et que la face arrière (22) du capteur de mesure de débit (17-23) communique avec la conduite
de raccordement (30, 31) entre le clapet anti-retour (45) et le distributeur pilote.
5. Dispositif selon l'une quelconque des revendications 1 à 4,
caractérisé par le fait
que le distributeur principal (6-13) et le capteur de mesure de débit (17-23) sont montés en série
et que l'axe de mouvement du distributeur principal est disposé en travers par rapport à l'axe de mouvement commun du capteur de mesure de débit et du distributeur pilote.
6. Dispositif selon les revendications 2 et 5, caractérisé par le fait
que le distributeur principal (6-13) est disposé - en direction du débit - devant le capteur de mesure de débit (17-23)
et que l'endroit sous pression plus basse est la partie du trajet d'écoulement qui se trouve entre le distributeur principal et le capteur de mesure de débit.
7. Dispositif selon la revendication 2 ou 3, caractérisé par le fait
que le distributeur principal (64, 66-68, 70) a la forme d'une valve d'échappement qui est disposée parallèlement au capteur de mesure de débit (78-80) et qui commande l'échappe du débit en excès à un raccordement (63) du réservoir
et que l'endroit sous pression plus basse est le raccordement (63) du réservoir.
EP81104114A 1980-06-03 1981-05-29 Dispositif asservi pour réglage de débit indépendant de la charge Expired EP0041247B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3020918 1980-06-03
DE19803020918 DE3020918A1 (de) 1980-06-03 1980-06-03 Vorgesteuerte vorrichtung zur lastunabhaengigen volumenstromregelung

Publications (3)

Publication Number Publication Date
EP0041247A2 EP0041247A2 (fr) 1981-12-09
EP0041247A3 EP0041247A3 (en) 1982-05-26
EP0041247B1 true EP0041247B1 (fr) 1985-11-13

Family

ID=6103791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81104114A Expired EP0041247B1 (fr) 1980-06-03 1981-05-29 Dispositif asservi pour réglage de débit indépendant de la charge

Country Status (2)

Country Link
EP (1) EP0041247B1 (fr)
DE (2) DE3020918A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040521A1 (de) * 1980-10-28 1982-05-27 Robert Bosch Gmbh, 7000 Stuttgart Vorgesteuerte vorrichtung zur lastunabbhaengigen regelung wenigstens eines volumenstromes proportional zu einem eingangssignal
WO2015130469A1 (fr) * 2014-02-28 2015-09-03 Mks Instruments, Inc. Structures de vanne pilote et dispositifs de commande de débit massique

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Publication number Priority date Publication date Assignee Title
DE3135855A1 (de) * 1981-09-10 1983-03-24 Backé, Wolfgang, Prof.Dr.-Ing., 5100 Aachen Vorrichtung zur lastunabhaengigen, einem eingangssignal proportionalen hub- und winkelregelung
DE3305093A1 (de) * 1983-02-14 1984-08-16 Herion-Werke Kg, 7012 Fellbach Mengenventil
EP0150308A3 (fr) * 1984-01-30 1986-10-01 Trw Inc. Appareil pour contrôler un courant de fluide
JPS61105381A (ja) * 1984-10-29 1986-05-23 Kawasaki Heavy Ind Ltd 電磁流量制御弁
DE3532591A1 (de) * 1985-09-12 1987-03-19 Rexroth Mannesmann Gmbh Hydraulische vorrichtung, insbesondere 2-wege-proportionaldrosselventil
DE3733642A1 (de) * 1987-10-05 1989-04-20 Daimler Benz Ag Mengenregelventil
AT393301B (de) * 1989-08-30 1991-09-25 Woutschuk Alfred Steuervorrichtung fuer ein hydraulisches druckventil
DE29713293U1 (de) 1997-07-25 1997-10-23 Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 81673 München Magnetbetätigtes Ablaßventil

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GB1335042A (en) * 1970-01-05 1973-10-24 Sperry Rand Ltd Hydraulic actuator controls

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US3044480A (en) * 1956-11-16 1962-07-17 Lee Shih-Ying Fluid flow controller
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DE1498284B2 (de) * 1965-05-08 1970-12-23 Bopp & Reuther Gmbh, 6800 Mannheim Absperrventil für eine Flüssigkeits-Menge nmeßeinr ic htung
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DE2056461C3 (de) * 1970-11-17 1979-04-26 Robert Bosch Gmbh, 7000 Stuttgart Ventil zum Begrenzen eines Druckmittelstroms
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DE2506923C3 (de) * 1975-02-19 1983-01-27 Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 8000 München Ventilvorrichtung
JPS5270283A (en) * 1975-12-08 1977-06-11 Deere & Co Fluid circuit
DE2754878A1 (de) * 1977-12-09 1979-06-13 Rexroth Gmbh G L Lastunabhaengig arbeitendes elektrisch ansteuerbares wegeventil
DD136524A5 (de) * 1977-12-16 1979-07-11 Technomatic Ag Sicherheitsventil
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Publication number Priority date Publication date Assignee Title
GB1335042A (en) * 1970-01-05 1973-10-24 Sperry Rand Ltd Hydraulic actuator controls

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040521A1 (de) * 1980-10-28 1982-05-27 Robert Bosch Gmbh, 7000 Stuttgart Vorgesteuerte vorrichtung zur lastunabbhaengigen regelung wenigstens eines volumenstromes proportional zu einem eingangssignal
WO2015130469A1 (fr) * 2014-02-28 2015-09-03 Mks Instruments, Inc. Structures de vanne pilote et dispositifs de commande de débit massique

Also Published As

Publication number Publication date
EP0041247A3 (en) 1982-05-26
EP0041247A2 (fr) 1981-12-09
DE3020918A1 (de) 1981-12-10
DE3172883D1 (en) 1985-12-19

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