DE19532037C1 - Control of pump-compressor with separately controlled suction and pressure valves - Google Patents
Control of pump-compressor with separately controlled suction and pressure valvesInfo
- Publication number
- DE19532037C1 DE19532037C1 DE1995132037 DE19532037A DE19532037C1 DE 19532037 C1 DE19532037 C1 DE 19532037C1 DE 1995132037 DE1995132037 DE 1995132037 DE 19532037 A DE19532037 A DE 19532037A DE 19532037 C1 DE19532037 C1 DE 19532037C1
- Authority
- DE
- Germany
- Prior art keywords
- valves
- pressure
- pump
- compressor
- suction
- 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 - Fee Related
Links
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
- F04B7/00—Piston machines or pumps characterised by having positively-driven valving
- F04B7/0076—Piston machines or pumps characterised by having positively-driven valving the members being actuated by electro-magnetic means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
- A61B5/0235—Valves specially adapted therefor
-
- 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
- F04B49/22—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 by means of 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
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0201—Position of the piston
-
- 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
- F04B2205/03—Pressure in the compression chamber
Abstract
Description
Bei einer herkömmlichen Membranpumpe, angetrieben von einem Motor, werden die Flatterventile durch die Druckverhältnisse zwangsgesteuert. Sie werden durch den Luftstrom und durch die Druckverhältnisse im Pumpenteil mit der Verdichterbewegung synchronisiert. Diese Konstruktionsmerkmale machen die Steuerbarkeit von häufig veränderbaren Pumpenparametern wie Flußmengen, zeitliches Verhalten eines Druckaufbaus in einem Druckvolumen, Entlüftungszeiten, Optimierung des Wirkungsgrades des Antriebs in Abstimmung mit der geforderten Pumpleistung, aufwendig und schwierig.In a conventional diaphragm pump, driven by a motor the flap valves are positively controlled by the pressure conditions. You will be through the air flow and the pressure conditions in the pump section with the Compressor movement synchronized. These design features make it Controllability of frequently changing pump parameters such as flow rates, temporal behavior of a pressure build-up in a pressure volume, venting times, Optimization of the efficiency of the drive in coordination with the required Pump performance, complex and difficult.
Pumpen mit elektromagnetisch ansteuerbaren Saug- und Druckventilen sind an sich beispielsweise aus der US-PS 41 50 925 bekannt.Pumps with electromagnetically controlled Suction and pressure valves are in themselves, for example known from US-PS 41 50 925.
Es ist die Aufgabe der Erfindung, ein kompaktes Gerät zu schaffen, welches ohne Änderung der Drehrichtung des Pumpenmotors sowohl eine Pumpfunktion als auch eine Saugfunktion in einer Einheit ermöglicht.It is the object of the invention to create compact device which without changing the direction of rotation of the Pump motor both a pump function and a suction function in one Unity enables.
Der Erfindung zufolge sollen die üblichen Flatterventile bei Membran- oder Kolbenpumpen durch zwei im Pumpenkörper integrierte diskrete 2/2-Wegeventile ersetzt werden. Bei einer Verwendung dieser Ventile kann durch eine Änderung der Phasenlage der Ventile sowohl die Aufpumpzeit der Pumpe als auch die Aufpumpcharakteristik variiert werden (Fig. 1). Durch die elektronische Ansteuerung der beiden aktiven Ventile lassen sich mit dieser Pumpe vier Betriebsarten verwirklichen: According to the invention, the usual flutter valves in diaphragm or piston pumps are to be replaced by two discrete 2/2-way valves integrated in the pump body. When using these valves, both the pumping-up time of the pump and the pumping-up characteristic can be varied by changing the phase position of the valves ( FIG. 1). The electronic control of the two active valves enables four operating modes to be achieved with this pump:
Der Verdichter wird mit konstanter Drehzahl bewegt und die Ventile so angesteuert, daß durch den Luftstrom vom Einlaßventil zum Auslaßventil ein Druck aufgebaut wird. Wird dabei die Phasenlage der Ansteuerung der Ventile konstant gehalten, baut sich der Druck nach einer Exponentialfunktion auf (Fig. 2).The compressor is moved at a constant speed and the valves are controlled so that a pressure is built up by the air flow from the inlet valve to the outlet valve. If the phase position of the control of the valves is kept constant, the pressure builds up according to an exponential function ( Fig. 2).
Auch hier besitzt der Verdichter eine konstante Drehzahl. Die Ventile werden im Un terschied zur Pumpfunktion 180° phasenverschoben angesteuert, so daß ein Luftstrom vom Auslaß- zum Einlaßventil entsteht, der im angeschlossenen Druck volumen den Druck bis zur Erreichung des maximalen Unterdrucks abbaut. Es lassen sich durch elektronische Phasenschieber beliebiger Übergänge zwischen beiden Betriebsarten Pumpen und Saugen realisieren. Nur eingeschränkt durch die maximale Druckwerte lassen sich beliebige Kurvenverläufe im positiven und negativen Druckbereich erzeugen, durch Variieren der Phasenverschiebung der Ventilansteuerung (Fig. 3).Here too the compressor has a constant speed. The valves are driven 180 degrees out of phase with the pump function so that an air flow from the outlet to the inlet valve is created, which in the connected pressure volume reduces the pressure until the maximum negative pressure is reached. Electronic phase shifters can be used to implement any transitions between the two operating modes, pumping and suction. Any curve shapes in the positive and negative pressure range can only be generated by the maximum pressure values, by varying the phase shift of the valve control ( Fig. 3).
Insbesondere in der Anwendung bei Blutdruckmessungen, wird das Volumen der Blutdruckmanschette gezielt nach bestimmten Kurvenverläufen entlüftet. Die Pumpe mit den aktiven, extern steuerbaren Ventilen erlaubt es, Entlüftungszeiten und belie bige Ablaßkurven zu verwirklichen. Bei stehendem Verdichter werden Ein- und Auslaßventil gleichzeitig geöffnet bzw. geschlossen. Die Steuerung kann sowohl analog (Proportionalverhalten) als auch durch eine pulsbreitenmodulierte Ansteuerung erfolgen. So kann eine Grundfrequenz von 50 Hz bei einer konstanten Pulsbreite eine fallende Exponentialfunktion der Ablaßkurve erzeugen. Diese Möglichkeit ersetzt die sonst übliche feste Ablaßdüse am Auslaß des Ventils, deren Durchmesser und Länge die Entlüftungszeit des Druckvolumen bestimmen (Fig. 4).Especially when used for blood pressure measurements, the volume of the blood pressure cuff is vented in a targeted manner according to certain curve profiles. The pump with the active, externally controllable valves makes it possible to implement venting times and any drain curves. When the compressor is stopped, the inlet and outlet valves are opened and closed simultaneously. The control can take place analog (proportional behavior) as well as by a pulse width modulated control. A basic frequency of 50 Hz with a constant pulse width can produce a falling exponential function of the drain curve. This option replaces the otherwise customary fixed drain nozzle at the outlet of the valve, the diameter and length of which determine the venting time of the pressure volume ( FIG. 4).
Auch in der Anordnung bei Blutdruckmessungen wird aus Sicherheitsgründen ge fordert, das Manschettenvolumen in kürzester Zeit zu entlüften. Dies wird gewähr leistet, in dem man Ventile verwendet, welche im stromlosen Zustand geöffnet sind (Fig. 5).For safety reasons, the arrangement of blood pressure measurements also requires venting the cuff volume in the shortest possible time. This is guaranteed by using valves that are open when de-energized ( Fig. 5).
Ein wesentliches Merkmal für die Erfindung ist die Erkennung der Membranstellung. Grundsätzlich sind 2 verschiedene Verfahren denkbar: Die Erfassung der oberen und unteren Totlagen des Verdichters, z. B. der Membranstellung oder ein konti nuierliches Überwachen der Membranbewegung (Fig. 6).An essential feature of the invention is the detection of the membrane position. Basically 2 different methods are conceivable: The detection of the upper and lower dead positions of the compressor, e.g. B. the membrane position or a continuous monitoring of the membrane movement ( Fig. 6).
Folgende Sensortypen sind verwendbar:
Reflexionslichtschranke, Hallsensor, induktive Sensoren, kapazitiver Sensor durch
Abstandsmessung. Diese Sensoren bestimmen prinzipiell die Synchronisation zwi
schen Verdichterbewegung und Ventilstellung unter Anwendung einer elektroni
schen Schaltung, welche auch geeignet ist, sämtliche für eine Blutdruckmessung
erforderlichen Funktionen zu übernehmen. Die Struktur der Schaltung ist wie folgt
vorgesehen (Fig. 7):The following sensor types can be used:
Reflection light barrier, Hall sensor, inductive sensors, capacitive sensor by distance measurement. In principle, these sensors determine the synchronization between the compressor movement and valve position using an electronic circuit, which is also suitable for performing all the functions required for a blood pressure measurement. The structure of the circuit is provided as follows ( Fig. 7):
Aktueller Druck in der Blutdruckmanschette, Signal des Posi tionssensors zur Erkennung der oberen Membrantotlage, Signal des Positionssen sors zur Erkennung der unteren Membrantotlage. Current pressure in the blood pressure cuff, signal from the Posi tion sensor to detect the upper diaphragm dead position, signal from the position sensor sensors for the detection of the lower membrane dead position.
Es sind die Ansteuersignale für das Ventil A (Einlaßventil) und das Steuersignal für das Ventil B (Auslaßventil).These are the control signals for valve A (intake valve) and the control signal for valve B (exhaust valve).
Diese Meß- und Regelelektronik muß optimiert werden, damit die Schalteigen schaften der verwendeten Ventiltechnologie berücksichtigt wird. Alle Ventile sind ge eignet, welche eine Schaltzeit von kleiner 5 ms aufweisen. Die Nennweite der Ven tile hängt vom Verwendungszweck der Pumpe ab. Als geeignet herausgestellt und leicht im Pumpenkörper integrierbar haben sich Mikromagnetventile mit einer masse armen Formfeder als Träger der Ventildichtung im Gegensatz zu der herkömm lichen Plungerventiltechnik. Sehr attraktiv sind auch Ventiltypen, welche als Aktor Bimorph-Piezoplättchen verwenden. Die bekannten Vorteile dieser Technologie sind sehr kleine Schaltzeiten (< 1 ms), geringer Leistungsbedarf und dadurch eine vernachlässigbare Verlustwärme. Es wird ausdrücklich nochmals auf die Wichtigkeit kleiner Schaltzeiten hingewiesen. Dieser Parameter ist entscheidend für die gesamte Funktion der Pumpe, wie sie die Erfindung festlegt. Werden die Schaltzeiten im Verhältnis zur Periodendauer des Verdichtungsvorgangs zu lang, treten erhebliche Verluste am Ende des Verdichtungsvorganges auf, was die Effektivität der Pumpe erheblich reduziert. Bei einer Verdichtungsfrequenz von 50 Hz, d. h. einer Periodendauer von 20 ms liegt die Grenze der Schaltzeit bei ca. 3 ms. Hinsichtlich dieser Forderung nach kurzen Schaltzeiten ist das Piezoprinzip als Ventiltechnologie dem Mikromagnetventil vorzuziehen.This measuring and control electronics must be optimized so that the switching properties the valve technology used is taken into account. All valves are ge suitable, which have a switching time of less than 5 ms. The nominal size of the Ven tile depends on the intended use of the pump. Exposed as suitable and Micromagnetic valves with a mass can be easily integrated into the pump body poor shaped spring as a carrier of the valve seal in contrast to the conventional plunger valve technology. Valve types that act as actuators are also very attractive Use bimorph piezoplates. The known advantages of this technology are very short switching times (<1 ms), low power consumption and therefore one negligible heat loss. It is explicitly reiterated on the importance short switching times indicated. This parameter is critical to that overall function of the pump as it defines the invention. Will the Switching times too long in relation to the period of the compression process, significant losses occur at the end of the compression process, which the Effectiveness of the pump significantly reduced. At a compression frequency of 50 Hz, i.e. H. After a period of 20 ms, the switching time limit is approx. 3 ms. With regard to this requirement for short switching times, the piezo principle is as Valve technology preferable to the micro solenoid valve.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1995132037 DE19532037C1 (en) | 1995-08-31 | 1995-08-31 | Control of pump-compressor with separately controlled suction and pressure valves |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1995132037 DE19532037C1 (en) | 1995-08-31 | 1995-08-31 | Control of pump-compressor with separately controlled suction and pressure valves |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19532037C1 true DE19532037C1 (en) | 1996-12-19 |
Family
ID=7770839
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1995132037 Expired - Fee Related DE19532037C1 (en) | 1995-08-31 | 1995-08-31 | Control of pump-compressor with separately controlled suction and pressure valves |
Country Status (1)
Country | Link |
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DE (1) | DE19532037C1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19961852A1 (en) * | 1999-12-22 | 2001-06-28 | Continental Teves Ag & Co Ohg | Pump has valve(s), preferably inlet valve(s), that determines parameter(s) dependent on pressure in pump cylinder and switching time of valve depending on the measured parameter |
EP1338794A1 (en) * | 2002-02-26 | 2003-08-27 | Whirlpool Corporation | Reciprocating pump, particularly for vacuum insulated domestic refrigerators |
DE202005013089U1 (en) * | 2005-08-19 | 2007-01-04 | Prominent Dosiertechnik Gmbh | Magnetic dosing pump, with a pressure piece and push rod acting on a membrane, has a reference unit for them with a non-contact position sensor to give an actual position signal for a control setting against a nominal value profile |
DE202005013090U1 (en) * | 2005-08-19 | 2007-01-04 | Prominent Dosiertechnik Gmbh | Motor e.g. asynchronous motor, dosing pump for dosing e.g. oil, has position sensor providing motion sequence of displacement organ so that electronic controlling of pump responds to operating conditions of dosing circle and dosing pump |
DE102005039772A1 (en) * | 2005-08-22 | 2007-03-08 | Prominent Dosiertechnik Gmbh | solenoid |
DE102004033862B4 (en) * | 2003-07-14 | 2008-10-23 | Kabushiki Kaisha Toyota Jidoshokki, Kariya | Machine that serves as an expansion and compression machine |
DE102008059205A1 (en) | 2008-11-27 | 2010-06-02 | Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. | Device for supplying medium along pipeline system, has inlet and outlet for medium, and hoisting device, which has pressure side and suction side |
EP2354546A1 (en) * | 2010-02-09 | 2011-08-10 | Vacuubrand Gmbh + Co Kg | Membrane vacuum pump |
EP2206918B1 (en) * | 2008-12-29 | 2012-02-08 | Vacuubrand Gmbh + Co Kg | Oscillating displacement vacuum pump |
IT201800004099A1 (en) * | 2018-03-29 | 2019-09-29 | Magneti Marelli Spa | PISTON PUMP AND RELEVANT CONTROL METHOD |
WO2022011874A1 (en) * | 2020-07-16 | 2022-01-20 | 深圳市捷美瑞科技有限公司 | Mechanical two-way valve, air pump, and electronic sphygmomanometer |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2785638A (en) * | 1954-04-08 | 1957-03-19 | Clifford B Moller | Force pump for slurries |
DE2018952A1 (en) * | 1969-07-23 | 1971-02-04 | VEB Kombinat Luft und Kältetechnik, χ 8010 Dresden | Output control of compressors |
US4150925A (en) * | 1977-09-02 | 1979-04-24 | California Institute Of Technology | Fast acting check valve |
-
1995
- 1995-08-31 DE DE1995132037 patent/DE19532037C1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2785638A (en) * | 1954-04-08 | 1957-03-19 | Clifford B Moller | Force pump for slurries |
DE2018952A1 (en) * | 1969-07-23 | 1971-02-04 | VEB Kombinat Luft und Kältetechnik, χ 8010 Dresden | Output control of compressors |
US4150925A (en) * | 1977-09-02 | 1979-04-24 | California Institute Of Technology | Fast acting check valve |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19961852A1 (en) * | 1999-12-22 | 2001-06-28 | Continental Teves Ag & Co Ohg | Pump has valve(s), preferably inlet valve(s), that determines parameter(s) dependent on pressure in pump cylinder and switching time of valve depending on the measured parameter |
EP1338794A1 (en) * | 2002-02-26 | 2003-08-27 | Whirlpool Corporation | Reciprocating pump, particularly for vacuum insulated domestic refrigerators |
DE102004033862B4 (en) * | 2003-07-14 | 2008-10-23 | Kabushiki Kaisha Toyota Jidoshokki, Kariya | Machine that serves as an expansion and compression machine |
DE202005013089U1 (en) * | 2005-08-19 | 2007-01-04 | Prominent Dosiertechnik Gmbh | Magnetic dosing pump, with a pressure piece and push rod acting on a membrane, has a reference unit for them with a non-contact position sensor to give an actual position signal for a control setting against a nominal value profile |
DE202005013090U1 (en) * | 2005-08-19 | 2007-01-04 | Prominent Dosiertechnik Gmbh | Motor e.g. asynchronous motor, dosing pump for dosing e.g. oil, has position sensor providing motion sequence of displacement organ so that electronic controlling of pump responds to operating conditions of dosing circle and dosing pump |
US8267667B2 (en) | 2005-08-22 | 2012-09-18 | Prominent Dosiertechnik Gmbh | Magnetic drive metering pump |
DE102005039772A1 (en) * | 2005-08-22 | 2007-03-08 | Prominent Dosiertechnik Gmbh | solenoid |
DE102008059205B4 (en) * | 2008-11-27 | 2012-10-04 | Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. | Bidirectional conveyor |
DE102008059205A1 (en) | 2008-11-27 | 2010-06-02 | Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. | Device for supplying medium along pipeline system, has inlet and outlet for medium, and hoisting device, which has pressure side and suction side |
DE102008059205B9 (en) * | 2008-11-27 | 2012-12-27 | Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. | Bidirectional conveyor |
EP2206918B1 (en) * | 2008-12-29 | 2012-02-08 | Vacuubrand Gmbh + Co Kg | Oscillating displacement vacuum pump |
EP2444666A1 (en) * | 2008-12-29 | 2012-04-25 | Vacuubrand Gmbh + Co Kg | Oscillating displacement vacuum pump |
DE202010002145U1 (en) * | 2010-02-09 | 2011-09-07 | Vacuubrand Gmbh + Co Kg | Diaphragm vacuum pump |
EP2354546A1 (en) * | 2010-02-09 | 2011-08-10 | Vacuubrand Gmbh + Co Kg | Membrane vacuum pump |
IT201800004099A1 (en) * | 2018-03-29 | 2019-09-29 | Magneti Marelli Spa | PISTON PUMP AND RELEVANT CONTROL METHOD |
EP3546746A1 (en) * | 2018-03-29 | 2019-10-02 | Magneti Marelli S.p.A. | Piston pump and relative control method |
CN110318968A (en) * | 2018-03-29 | 2019-10-11 | 马涅蒂-马瑞利公司 | Piston pump and corresponding control methods |
US10914295B2 (en) | 2018-03-29 | 2021-02-09 | Marelli Europe S.P.A. | Piston pump and relative control method |
WO2022011874A1 (en) * | 2020-07-16 | 2022-01-20 | 深圳市捷美瑞科技有限公司 | Mechanical two-way valve, air pump, and electronic sphygmomanometer |
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