EP0031937B1 - Elektropneumatischer oder elektrohydraulischer Wandler - Google Patents

Elektropneumatischer oder elektrohydraulischer Wandler Download PDF

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Publication number
EP0031937B1
EP0031937B1 EP80108033A EP80108033A EP0031937B1 EP 0031937 B1 EP0031937 B1 EP 0031937B1 EP 80108033 A EP80108033 A EP 80108033A EP 80108033 A EP80108033 A EP 80108033A EP 0031937 B1 EP0031937 B1 EP 0031937B1
Authority
EP
European Patent Office
Prior art keywords
flap
transducer
nozzle
electro
pneumatic
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
EP80108033A
Other languages
English (en)
French (fr)
Other versions
EP0031937A1 (de
Inventor
Alpo Dipl.-Ing. Seppänen
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.)
S-INSTALLATION Ky
Original Assignee
S-INSTALLATION Ky
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 S-INSTALLATION Ky filed Critical S-INSTALLATION Ky
Priority to AT80108033T priority Critical patent/ATE16628T1/de
Publication of EP0031937A1 publication Critical patent/EP0031937A1/de
Application granted granted Critical
Publication of EP0031937B1 publication Critical patent/EP0031937B1/de
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
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C3/00—Circuit elements having moving parts
    • F15C3/10—Circuit elements having moving parts using nozzles or jet pipes
    • F15C3/14—Circuit elements having moving parts using nozzles or jet pipes the jet the nozzle being intercepted by a flap
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C3/00—Circuit elements having moving parts
    • F15C3/10—Circuit elements having moving parts using nozzles or jet pipes
    • F15C3/12—Circuit elements having moving parts using nozzles or jet pipes the nozzle or jet pipe being movable

Definitions

  • the present invention relates to an electro-pneumatic or electro-hydraulic transducer, in which there is a pneumatic or hydraulic nozzle-flap system, which flap is controlled by an electric control signal, as described in the preamble of claim 1.
  • a transducer comprising the features of the preamble of claim 1 is known from US-A-3 099 995.
  • an oscillating control signal with variable duty-cycle is applied to the flap, and thereby it is ensured that the adjustment drive for the flap and the flap itself can have a smaller mass, and thus a high response speed can be achieved.
  • the known transducer operates in the manner that the flap opens and closes alternatingly the nozzle.
  • the pressure in the pressure chamber upstream of the nozzle shall change between inlet pressure and atmospheric pressure, and this necessitates an extremely small pressure chamber.
  • the known transducer Due to the necessity to have a small pressure chamber, the known transducer is subject to considerable precision requirements and constructive restrictions. Besides, an increase of the frequency is limited by the size of the pressure chamber. Moreover, the customary nozzle-flap systems, i.e. systems with the usual dimensions, cannot be used in the known transducer.
  • the input pressure or the atmospheric pressure need not be produced in its pressure chamber. Therefore the pressure chamber resp. the volume between the nozzle and the restricted inlet orifice can be much greater in the transducer of the invention than in the known transducer (US-A-3 009 995).
  • An extensive correspondence of the duty-cyle of the applied electric control signal to the output pressure out is still ensured, namely by limiting the range of movement of the nozzle flap.
  • the precision requirements to the design of a small pressure chamber are therefore not as strict as in the case of the known transducer, and the increase of the frequency is not limited by the volume of the pressure chamber.
  • An electro-pneumatic transducer illustrated in Figure 1 comprises a nozzle-flap device, essentially known as such.
  • This device comprises flap 10 made of flexible material or supported by bearings at 11.
  • the nozzle-flap device comprises pipe 15 with throttle 16 forming a restricted inlet orifice and, near flap 10, nozzle 14.
  • Nozzle pipe 15 the interior of which is forming a pressure chamber is connected by pipe 17 to variable- pressure tank (pressure P), where the output pressure Pout of the transducer is taken from.
  • pressure P variable- pressure tank
  • the duty-cycle T fT o of the pulse that raises and lowers the pneumatic or hydraulic pressure proportionally to input signal l in is varied within cycle period To corresponding to basic frequency f o .
  • pulse Ti whose amplitude is 1 0 is very short compared with the cycle period To; therefore the output pressure Pout of Figure 1 is rather low.
  • the pressure-raising pulse T2 is approx.
  • 0,5xT o and Pout then is in the middle area of its dynamic range.
  • the pressure-raising pulse T3 is relatively long, and output pressure Pout is in the top area of its dynamic range. It has been emphasized that pulses can of course be pressure-lowering pulses as well.
  • Figure 2 illustrates the ratio of the adjusted pressure P and the input pressure P as a function of the distance S between the nozzle 14 and the flap 10.
  • a S illustrates the linear operation range, on which the transducers in accordance with the invention function.
  • nozzle 14 is never completely closed or opened much enough to enter the unlinear bottom section of the characteristic curve.
  • the flap 10 is made to vibrate, for instance magnetically.
  • An electro-pneumatic system illustrated in Figure 4 comprises a device 21 comprised of the above described elements 15, 16, 17 and 18, to which the pneumatic input pressure P s is brought.
  • Output pressure Pout of the nozzle-flap system 10,14 operating as described above is adjusted so to be proportional to input signal l in .
  • a feedback loop of the system comprises pneumatic bellows 27 and element 37 which converts the force of the bellows 27 into an electrical feedback signal l 1 .
  • Feedback control l 1 is conducted via wire 26 to unit 20.
  • Control signal I(T) illustrated in Figure 3 is formed according to the difference signal l in -l 1 .
  • Figure 5 illustrates an electro-pneumatic transducer in accordance with the invention, as provided to actuate a valve 23.
  • the system comprises the device 21, whose pressure Pout is conducted to diaphragm motor 22 actuating the control valve 23.
  • the feedback loop of the system comprises an element 24 that converts the position of valve 23 into an electrical signal. This element 24 conducts the feedback signal 1 1 via wire 26 to unit 20.
  • the output quantity of the system is for instance the flow F out controlled by valve 23.
  • the electric control signal is a current signal, it should be within range 4...20 mA.
  • the nozzle-flap system 10;14 can be made operate in the linear area AS shown in Figure 2 in such a way that nozzle 14 is never completely closed or opened.
  • the lower limit of frequency f o is approx. 15 Hz.
  • the most favourable frequency range from the point of view of the invention is over 30 Hz, for instance 30...40 Hz.
  • the frequency can be of the order of 100 Hz.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Valve Device For Special Equipments (AREA)
  • Servomotors (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Claims (5)

1. Elektro-pneumatischer oder elektrohydraulischer Wandler, der eine geregelte Druckkammer (15) aufweist, die durch eine begrenzte Einlaßöffnung (16) unter Druck gesetzt wird un den Druck abbaut durch ein elektrisch betätigtes pneumatisches oder hydraulisches Düsenklappensystem (10, 11, 14), daß eine Klappe (10) eine Düse (14) aufweist, wobei die Bewegung der Klappe (10) von einem elektrischen Steuersignal gesteuert wird, wobei das Steuersignal eine Pulsfolge (I(T)) ist, die in einer bestimmten Frequenz (f oderfo) schwingt, in welcher Pulsfolge der Abeitszyklus (τ/To) der Impulse proportional zu einem Eingangssignal (lin) und innerhalb der Schwingungsperiode (To) entsprechend der Frequenz (f oder fo) verändert wird, dadurch gekennzeichnet, daß das Düsenklappensystem (10, 11, 14) eine charakteristische Kurve mit einem linearen Bereich (Δ S) aufweist, wobei die Kurve bestimmt wird von der Abhängigkeit des relativ eingestellten Druckes (P/Ps) auf der Strecke (S) zwischen der Düse (14) und der Klappe (10), sowie dadurch daß die Bewegung der Kläppe (10) während des Betriebs des Wandlers im wesentlichen begrenzt ist auf den linearen Bereich (Δ S) der charakteristischen Kurve (Fig. 2), so daß die Klappe (10) die Düse (14) nie vollständig öffnet oder schließt, wobei diese Vorteil durch mechanische Stopper und/oder ausreichend hohe Auswahl der Frequenz (f oder fo) erzielt wird.
2. Wandler nach Anspruch 1, dadurch gekennzeichnet, daß die bestimmte Frequenz (fo) höber ist als ca. 30 Hz.
3. Wandler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die bestimmte Frequenz (fo) der Impulsfolge (I(T)) im Bereich von 30 bis 40 Hz liegt.
4. Wandler nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß eine elektromagnetische Spule (12) zum Oszillieren der Klappe (10) vorgesehen ist.
5. Wandler nach Anspruch 1, 2, 3 oder 4, dadurch gekennzeichnet, daß ein elektrisches rückgeleitetes Signal (11) von dem Ausgangssignal (Pout) des Wandler gebildet wird und daß das rückgeleitete Signal (11) zu einer elektronischen Einheit (20) geführt wird, die zusätzlich mit dem Eingangssignal (lin) an analoger Form versorgt wird und die die Impulsfolge (l(τ)) als Differenzsignal (lin-l1) vorsieht.
EP80108033A 1979-12-21 1980-12-18 Elektropneumatischer oder elektrohydraulischer Wandler Expired EP0031937B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80108033T ATE16628T1 (de) 1979-12-21 1980-12-18 Elektropneumatischer oder elektrohydraulischer wandler.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI794041A FI59653C (fi) 1979-12-21 1979-12-21 Elpneumatisk eller -hydraulisk omvandlare eller laegedon
FI794041 1979-12-21

Publications (2)

Publication Number Publication Date
EP0031937A1 EP0031937A1 (de) 1981-07-15
EP0031937B1 true EP0031937B1 (de) 1985-11-21

Family

ID=8513151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80108033A Expired EP0031937B1 (de) 1979-12-21 1980-12-18 Elektropneumatischer oder elektrohydraulischer Wandler

Country Status (6)

Country Link
EP (1) EP0031937B1 (de)
AT (1) ATE16628T1 (de)
DE (1) DE3071256D1 (de)
DK (1) DK541380A (de)
FI (1) FI59653C (de)
NO (1) NO156390C (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4538644A (en) * 1983-06-09 1985-09-03 Applied Power Inc. Pressure regulator
DE4105062C2 (de) * 1990-09-19 1997-01-23 Helmut Prof Dipl Ing Hoenicke Elektropneumatischer Stellungsregler mit Pulsbreitenansteuerung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099995A (en) * 1960-05-19 1963-08-06 Joens & Co Gmbh W H Electro-pneumatic transducer
US3456669A (en) * 1966-10-20 1969-07-22 Fisher Governor Co Piezoelectric transducer
DE2239060A1 (de) * 1971-10-26 1973-05-10 Machida Endoscope Co Ltd Luftzufuhrgeraet zur einstellung eines konstanten luftdruckes
DE2511752A1 (de) * 1975-03-18 1976-10-07 Ver Flugtechnische Werke Signalwandlerstufe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2811345C2 (de) * 1978-03-16 1986-12-11 Knorr-Bremse AG, 8000 München Druckregler für pneumatische Drücke, insbesondere in Fahrzeugen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099995A (en) * 1960-05-19 1963-08-06 Joens & Co Gmbh W H Electro-pneumatic transducer
US3456669A (en) * 1966-10-20 1969-07-22 Fisher Governor Co Piezoelectric transducer
DE2239060A1 (de) * 1971-10-26 1973-05-10 Machida Endoscope Co Ltd Luftzufuhrgeraet zur einstellung eines konstanten luftdruckes
DE2511752A1 (de) * 1975-03-18 1976-10-07 Ver Flugtechnische Werke Signalwandlerstufe

Also Published As

Publication number Publication date
FI59653C (fi) 1981-09-10
NO156390C (no) 1987-09-09
FI59653B (fi) 1981-05-29
EP0031937A1 (de) 1981-07-15
NO156390B (no) 1987-06-01
DE3071256D1 (en) 1986-01-02
DK541380A (da) 1981-06-22
NO803813L (no) 1981-06-22
ATE16628T1 (de) 1985-12-15

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