EP3739209B1 - Kolbenkompressor zur medizinischen verwendung - Google Patents

Kolbenkompressor zur medizinischen verwendung Download PDF

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Publication number
EP3739209B1
EP3739209B1 EP19174030.7A EP19174030A EP3739209B1 EP 3739209 B1 EP3739209 B1 EP 3739209B1 EP 19174030 A EP19174030 A EP 19174030A EP 3739209 B1 EP3739209 B1 EP 3739209B1
Authority
EP
European Patent Office
Prior art keywords
motor
compressor
control module
rotation speed
tank
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.)
Active
Application number
EP19174030.7A
Other languages
English (en)
French (fr)
Other versions
EP3739209A1 (de
Inventor
Ennio Cattani
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.)
Cattani SpA
Original Assignee
Cattani SpA
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Filing date
Publication date
Application filed by Cattani SpA filed Critical Cattani SpA
Priority to EP19174030.7A priority Critical patent/EP3739209B1/de
Priority to US16/843,555 priority patent/US20200362850A1/en
Publication of EP3739209A1 publication Critical patent/EP3739209A1/de
Application granted granted Critical
Publication of EP3739209B1 publication Critical patent/EP3739209B1/de
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Anticipated expiration legal-status Critical

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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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26—Control
    • 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
    • F04B49/225—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 with throttling valves or valves varying the pump inlet opening or the outlet opening
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • 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
    • F04B49/06—Control using electricity
    • 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
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F04B49/10—Other safety measures
    • F04B49/103—Responsive to speed
    • 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
    • F04B49/20—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 changing the driving speed
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed
    • 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
    • F04B2205/04—Pressure in the outlet chamber
    • 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
    • F04B2205/17—Opening width of a throttling device
    • F04B2205/171—Opening width of a throttling device before the pump inlet

Definitions

  • the present invention relates to a compressor system having a piston compressor.
  • the compressor system according to the present invention is particularly, but not exclusively, advantageous for medical use, for example for operating dental tools and equipment.
  • volumetric compressors of the piston type with one or more cylinders are very widespread.
  • the current compressors are equipped with a tank, connected to the delivery of the cylinders.
  • the pressure inside the tank is detected by means of a pressure gauge, in turn connected to the control module of the motor driving the compressor.
  • the control module controls the ignition of the motor in relation to the pressure detected inside the tank.
  • the control module controls the stop of the motor.
  • Some compressors are additionally provided with an inverter for controlling the motor.
  • an inverter for controlling the motor.
  • the actuation of the motor is adjusted on the basis of the variation of the pressure inside the tank over time, varying the rotation speed.
  • the motor in low air demand conditions, and therefore with a modest pressure drop inside the tank, the motor is progressively slowed, and only in the case of a substantially null demand for air is the motor stopped. Therefore, the motor operates at a rather low rotation speed for rather prolonged intervals of time.
  • both motors and mono- or bi-cylindrical compressors with low rotation speeds produce very low frequency vibrations, i.e. they produce oscillations of comparatively high amplitude that can be mechanically problematic to contain and absorb. Furthermore, at low rotation speeds the efficiency of the compressor declines considerably.
  • the object of the present invention is to offer a pneumatic piston compressor which allows the drawbacks summarised above to be overcome.
  • One advantage of the compressor according to the present invention is that it allows drastically reducing the oscillations at low rotation speeds.
  • Another advantage of the compressor according to the present invention is that it has a better yield, in particular at low rotation speeds.
  • Figure 1 schematically shows, for the sake of simplicity, a solution in which the compressor is provided with a single cylinder.
  • the description that follows refers to the solution shown, but it is also valid and consistent in the presence of a greater number of cylinders.
  • the cylinder (2) encloses a cylindrical volume inside which a piston is sealedly movable, according to a reciprocating motion.
  • the cylinder (2) is provided with a suction opening (21) and a discharge opening (22), controlled by respective valves operated by a distribution system of a known type, not shown in detail.
  • the compressor further comprises a motor (5).
  • the motor (5) comprises a drive shaft connected to the piston (2) via a rod-crank linkage.
  • the motor (5) is provided with the possibility of varying its rotation speed.
  • the motor (5) is an electric motor provided with an inverter (51).
  • This solution by virtue of the noiselessness of the electric motor, is particularly adapted for use inside the compressor, for example in medical or dental offices.
  • the motor (5) can be of another type for other uses, for example it could be an internal combustion engine. In this case, the adjustment of the rotation speed of the motor can be performed by adjusting the fuel supply.
  • the compressor is also provided with a suction duct (3), connected to the suction opening (21), and a discharge duct (4), connected to the discharge opening (22).
  • the compressor comprises an adjustment valve (6), arranged along the suction duct (3), which is predisposed to vary the flow rate of the air directed to the suction opening (21).
  • the presence of the adjustment valve (6) along the suction duct (3) produces significant technical effects.
  • the adjustment valve (6) it is possible to vary the flow rate of the air sucked by the compressor as a function of the rotation speed of the motor (5).
  • This allows significantly reducing the oscillations of the compressor at low rotation speeds.
  • reducing the flow rate of sucked air it is possible to reduce the length of the stroke of the piston during which the maximum pressure develops, i.e. the delivery pressure of the compressor.
  • the adjustment valve (6) In the limit condition wherein the adjustment valve (6) is closed, the piston completes its stroke cycle without in fact producing the delivery pressure of the compressor.
  • the condition described above also allows increasing the efficiency of the compressor, since the reduction of the flow rate of sucked air, at equal rotation speeds, allows reducing the power absorbed by the motor (5).
  • the control of the adjustment valve (6) can be carried out in an automatic manner, as a function of the rotation speed of the motor (5).
  • the compressor is provided with a control module (7), connected to the motor (5) and to the adjustment valve (6), which is predisposed to operate the adjustment valve (6) as a function of the rotation speed of the motor (5).
  • the control module (7) receives in input a significant datum of the rotation speed of the motor (5) and, on the basis of the datum received, adjusts the opening of the adjustment valve (6) so as to obtain a predetermined suction flow rate, according to a control algorithm predisposed in the control module (7).
  • the control module (7) in a known manner, comprises a PLC and/or an electronic processor suitable to operate according to a predetermined control algorithm. Thanks to the control module (7) configured as described above, the motor (5) always operates in conditions of maximum efficiency and with much lower oscillations and vibrations compared to what would occur at low frequencies, without a valve.
  • the rotation speed of the motor (5) is considered to substantially coincide with the speed controlled by the inverter (51), i.e. not using the actual motor speed, but the speed that the inverter (51) imposes on the motor. In this way the need to use a sensor for detecting the rotation speed of the motor (5) is avoided. Alternatively, it would be possible to predispose a suitable sensor for detecting the rotation speed of the motor.
  • the compressor according to the present invention further comprises a tank (8), connected to the discharge duct (4).
  • the tank (8) is provided with a pressure gauge (81) that is connected to the control module (7).
  • the control module (7) is predisposed to adjust the rotation speed of the motor (5) as a function of the pressure detected by the pressure gauge (81) inside the tank (8). If the pressure inside the tank rises above a predetermined maximum value, the control module controls the stop of the motor (5), possibly with a predefined delay. If the pressure falls below the predetermined maximum value, the control module controls the ignition of the engine (5), adjusting its rotation speed as a function of the pressure and the pressure variation over time. Simultaneously with the rotation speed of the motor (5), as already pointed out, the control module (7) controls the adjustment valve (6), varying the flow rate of sucked air as a function of the rotation speed of the motor (5).
  • the compressor according to the present invention can also be equipped with further accessory devices, of known type, illustrated by way of example in figure 1 .
  • a cooler (41) can be provided, predisposed to reduce the temperature of the air sent to the tank (8).
  • a condensate trap (42) Downstream of the cooler (41) and upstream of the tank (8) a condensate trap (42) can also be arranged, whose draining can be adjusted by a solenoid valve (45), or by an automatic valve of another type, a dryer (43), to eliminate the moisture in the air sent to the tank (8), and a filter (44).
  • the tank (8) is provided with a maximum pressure safety valve (82).
  • a suction filter (61) is also arranged upstream of the adjustment valve (6), along the suction duct (3).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Claims (3)

  1. Kompressorsystem aufweisend einen volumetrischen Kompressor mit einem oder mehreren Zylindern, umfassend:
    mindestens einen Zylinder (2), der mit einer Saugöffnung (21) und einer Abgabeöffnung (22) versehen ist, die durch jeweilige Ventile gesteuert werden;
    eine Saugleitung (3), die mit der Saugöffnung (21) verbunden ist;
    eine Abgabeleitung (4), die mit der Abgabeöffnung verbunden ist;
    einen Motor (5), der den volumetrischen Kompressor antreibt und mit der Möglichkeit versehen ist, seine Rotationsgeschwindigkeit zu verändern;
    mindestens ein Einstellventil (6), das entlang der Saugleitung (3) angeordnet ist und dazu eingerichtet ist, die Strömungsgeschwindigkeit der zu der Saugöffnung geleiteten Luft zu verändern;
    dadurch gekennzeichnet, dass es ein Steuermodul (7) umfasst, das mit dem Motor (5) und dem Einstellventil (6) verbunden ist, das eingerichtet ist, um das Einstellventil (6) als Funktion der Rotationsgeschwindigkeit des Motors (5) zu betätigen.
  2. Kompressorsystem nach Anspruch 1, umfassend einen Tank (8), der mit der Abgabeleitung (4) verbunden und mit einem Druckmesser (81) versehen ist, der mit dem Steuermodul (7) verbunden ist, wobei das Steuermodul (7) eingerichtet ist, um die Rotationsgeschwindigkeit des Motors (5) als Funktion des Drucks einzustellen, der durch das Manometer (81) innerhalb des Tanks (8) gemessen wird.
  3. Kompressorsystem nach Anspruch 1 oder 2, wobei der Motor (5) ein Elektromotor ist, der mit einem Wechselrichter (51) versehen ist, der mit dem Steuermodul (7) verbunden ist.
EP19174030.7A 2019-05-13 2019-05-13 Kolbenkompressor zur medizinischen verwendung Active EP3739209B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19174030.7A EP3739209B1 (de) 2019-05-13 2019-05-13 Kolbenkompressor zur medizinischen verwendung
US16/843,555 US20200362850A1 (en) 2019-05-13 2020-04-08 Piston compressor for medical use

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19174030.7A EP3739209B1 (de) 2019-05-13 2019-05-13 Kolbenkompressor zur medizinischen verwendung

Publications (2)

Publication Number Publication Date
EP3739209A1 EP3739209A1 (de) 2020-11-18
EP3739209B1 true EP3739209B1 (de) 2022-03-23

Family

ID=66751850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19174030.7A Active EP3739209B1 (de) 2019-05-13 2019-05-13 Kolbenkompressor zur medizinischen verwendung

Country Status (2)

Country Link
US (1) US20200362850A1 (de)
EP (1) EP3739209B1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5812861A (ja) * 1981-07-17 1983-01-25 Diesel Kiki Co Ltd 自動車用エア配管系の圧力制御装置
US6109886A (en) * 1997-10-02 2000-08-29 Wabco Gmbh Compressed-air supply installation with reduced idling power
SE0202403L (sv) * 2002-08-13 2004-02-14 Cargine Engineering Ab Styrmetid för reglering av gasflödet vid en kompressor
DE102005038273A1 (de) * 2005-08-02 2007-02-08 Linde Ag Maschine mit einem drehbaren Rotor
DE102016105145A1 (de) * 2016-03-21 2017-09-21 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Kolbenkompressor mit erweitertem Regelbereich

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Publication number Publication date
US20200362850A1 (en) 2020-11-19
EP3739209A1 (de) 2020-11-18

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