EP3739209B1 - Piston compressor for medical use - Google Patents

Piston compressor for medical use Download PDF

Info

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
German (de)
French (fr)
Other versions
EP3739209A1 (en
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
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 Cattani SpA filed Critical Cattani SpA
Priority to EP19174030.7A priority Critical patent/EP3739209B1/en
Priority to US16/843,555 priority patent/US20200362850A1/en
Publication of EP3739209A1 publication Critical patent/EP3739209A1/en
Application granted granted Critical
Publication of EP3739209B1 publication Critical patent/EP3739209B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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).

Description

  • 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.
  • Various types of compressors for dental equipment or medical devices in general are currently available on the market.
  • Among the available compressors, volumetric compressors of the piston type with one or more cylinders are very widespread.
  • In general, 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. In particular, when the pressure drops below a predefined minimum value, the motor is placed in operation. The actuation of the motor leads to an increase in the pressure inside the tank. When the pressure reaches a predefined maximum value detected by the pressure gauge, the control module controls the stop of the motor.
  • Some compressors are additionally provided with an inverter for controlling the motor. In the presence of an inverter, 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.
  • In particular, 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.
  • As is known, 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.
  • In document US2007/031267 it is described a piston compressor having a vacuum limiting device installed the intake of the compressor. The vacuum limiting device only in part contributes to solve the technical problem above summarized, as it is controlled only on the basis of the pressure at the intake of the compressor, while the speed rate of the compressor is not considered.
  • 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.
  • Further characteristics and advantages of the present invention will become more apparent in the following detailed description of an embodiment of the present invention, illustrated by way of non-limiting example in the attached figure 1.
  • 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.
  • In a known manner, 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). In a known manner, 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. To this end, in a preferred but not exclusive embodiment, 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).
  • Advantageously, 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. In fact, thanks to 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). In particular, it is possible to reduce the flow rate of the sucked air with the lowering of the rotation speed of the motor (5). This allows significantly reducing the oscillations of the compressor at low rotation speeds. In fact, 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. 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. In addition to allowing a reduction of the oscillations, 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).
  • Advantageously, in a preferred but not exclusive embodiment of the compressor, 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). To this end, 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.
  • In a preferred embodiment of the compressor, 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. For example, along the discharge duct (4) and upstream of the tank (8), a cooler (41) can be provided, predisposed to reduce the temperature of the air sent to the tank (8). 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).

Claims (3)

  1. A compressor system having a volumetric compressor with one or more cylinders, comprising:
    at least one cylinder (2), provided with a suction opening (21) and a discharge opening (22) controlled by respective valves;
    a suction duct (3), connected to the suction opening (21);
    a discharge duct (4), connected to the discharge opening;
    a motor (5) driving the volumetric compressor, provided with the possibility of varying its rotation speed;
    at least one 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;
    characterised in that it comprises 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).
  2. The compressor system according to claim 1, comprising a tank (8) connected to the discharge duct (4) and provided with a pressure gauge (81) that is connected to the control module (7), wherein 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).
  3. The compressor system according to claim 1 or 2, wherein the motor (5) is an electric motor provided with an inverter (51) connected to the control module (7).
EP19174030.7A 2019-05-13 2019-05-13 Piston compressor for medical use Active EP3739209B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19174030.7A EP3739209B1 (en) 2019-05-13 2019-05-13 Piston compressor for medical use
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 (en) 2019-05-13 2019-05-13 Piston compressor for medical use

Publications (2)

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

Family

ID=66751850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19174030.7A Active EP3739209B1 (en) 2019-05-13 2019-05-13 Piston compressor for medical use

Country Status (2)

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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5812861A (en) * 1981-07-17 1983-01-25 Diesel Kiki Co Ltd Pressure control device for air piping system of car
US6109886A (en) * 1997-10-02 2000-08-29 Wabco Gmbh Compressed-air supply installation with reduced idling power
SE0202403L (en) * 2002-08-13 2004-02-14 Cargine Engineering Ab Control time for regulating the gas flow at a compressor
DE102005038273A1 (en) * 2005-08-02 2007-02-08 Linde Ag Machine with a rotatable rotor
DE102016105145A1 (en) * 2016-03-21 2017-09-21 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Piston compressor with extended control range

Also Published As

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

Similar Documents

Publication Publication Date Title
RU2638231C1 (en) Compressor system and method of compressor system operation depending on rail vehicle operation mode
RU2703046C1 (en) Piston compressor with extended control range
NL1038701C2 (en) Device for extracting humid from air by using a wind-turbine in combination with a mechanically driven heat-pump system, as well as heat-pump system applicable with such a device.
JP5171930B2 (en) Improvements to fuel injection systems for internal combustion engines.
CN104912800B (en) A kind of adjustable single machine two-stage inverter screw compressor of interior volume specific ratio
JP5044611B2 (en) Fuel injection system with high-pressure variable discharge pump
CN102859125B (en) Control arrangement for a gas exchange valve in a piston engine
CN102654082A (en) Method for controlling the speed limit of a combustion engine
RU2013111319A (en) VACUUM FEED METHOD AND VACUUM FEED SYSTEM (OPTIONS)
US6162028A (en) Fuel pumping device for two-stroke engines with an additional driving unit
EP3739209B1 (en) Piston compressor for medical use
JP2006138312A (en) Accumulation chamber type fuel injection system for internal combustion engine
EP3219972A1 (en) Fuel supply apparatus for general purpose engine
EP0877856A1 (en) Internal combustion engines
CN102705031A (en) Stepless variable lift system of engine
JP5163962B2 (en) Steam system
KR100290398B1 (en) Turbo charger control apparatus
WO1995008704A1 (en) Supercharged internal combustion engine
US10711661B2 (en) Method and device for operating a drive unit, drive unit, motor vehicle
CN2593127Y (en) Adjustable control device for rolling rotor decompressor
SE464774B (en) DEVICE FOR REDUCING GAS EXCHANGE LOSSES WITH A COMBUSTION ENGINE
KR102032074B1 (en) Control devices and internal combustion engines of internal combustion engines
CN102877930A (en) Direct-current ventilation four-stroke engine
KR20000017203U (en) structure for reduction vibration of loop-pipe in compressor
KR200380580Y1 (en) Auxiliary intake device for engine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: CATTANI S.P.A.

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20210426

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20211105

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602019012722

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1477601

Country of ref document: AT

Kind code of ref document: T

Effective date: 20220415

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20220323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220623

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220623

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1477601

Country of ref document: AT

Kind code of ref document: T

Effective date: 20220323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220624

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220725

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220723

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602019012722

Country of ref document: DE

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220513

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220531

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220531

26N No opposition filed

Effective date: 20230102

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220513

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220523

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220323

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230519

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20230518

Year of fee payment: 5

Ref country code: DE

Payment date: 20230530

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SK

Payment date: 20230426

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20230525

Year of fee payment: 5

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20230513