EP3508729A1 - Compresseur pourvu de conduite d'aspiration et procédé de commande d'un compresseur - Google Patents
Compresseur pourvu de conduite d'aspiration et procédé de commande d'un compresseur Download PDFInfo
- Publication number
- EP3508729A1 EP3508729A1 EP18150650.2A EP18150650A EP3508729A1 EP 3508729 A1 EP3508729 A1 EP 3508729A1 EP 18150650 A EP18150650 A EP 18150650A EP 3508729 A1 EP3508729 A1 EP 3508729A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compressor
- liquid
- valve
- suction line
- 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.)
- Granted
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0007—Injection of a fluid in the working chamber for sealing, cooling and lubricating
- F04C29/0014—Injection of a fluid in the working chamber for sealing, cooling and lubricating with control systems for the injection of the fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/028—Means for improving or restricting lubricant flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/10—Fluid working
- F04C2210/1005—Air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/86—Detection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/026—Lubricant separation
Definitions
- the invention relates to a compressor, in particular a liquid-injected screw compressor, for the production of compressed air according to claim 1 and a method for controlling a compressor according to claim 14.
- liquid injected in liquid-injected screw compressors for lubrication is typically oil or water.
- oil-injected screw compressors the oil injected into the compressor block or the compressor stage must be separated from the generated compressed air in order to keep the oil in the oil circuit and to be able to produce compressed air with as little residual oil content as possible.
- the oil is usually deposited in so-called oil separation tanks in two stages.
- the first separation stage comprises a mechanical pre-separation, wherein the majority of the oil from the compressed air-oil mixture can be separated and accumulates by gravity in the lower part of the oil separation.
- the second separation stage one or more so-called oil separation cartridges are used in a fine separation in order to be able to deposit even the finest oil droplets.
- These cartridges are equipped with a filter consisting of one or more filter media.
- the filter side facing the first separation stage usually becomes "wet side” called, the compressed air outlet zugte filter side is usually called “dry side".
- the oil drops contained in the compressed air / oil mixture settle on both sides of the filter as they pass through the filter.
- these amounts of oil are extracted via a suction line, which returns the oil to a lower pressure level - e.g. the intake area of the compressor block.
- a suction line returns the oil to a lower pressure level - e.g. the intake area of the compressor block.
- the cross section of the suction line is dimensioned correspondingly small and / or a nozzle used.
- this alone is not sufficient as a measure, as can be promoted via a line that is just enough in terms of their cross-section to suck the accumulated oil, still unacceptably large compressed air flow rates can be promoted.
- the cross section can not be reduced arbitrarily, otherwise dirt particles could clog the suction.
- a suction line is connected to the oil injection line.
- an additional check valve may be required to prevent backflow of oil to the dry side of the second separation stage.
- the EP 0 744 550 A2 shows an additional valve in the suction line, which can be opened and closed. However, this arrangement can not prevent the efficiency-reducing backflow of compressed air into the compressor block.
- US 2015/0343365 A1 describes an extraction system with oil level monitoring in the area of the second separation stage, which is intended to prevent the efficiency-damaging passage of compressed air into the compressor block.
- the technical realization of this solution is complicated and unreliable.
- a described float valve is prone to malfunction, eg due to soiling.
- the present invention therefore has for its object to provide a compressor and a method for controlling a compressor for generating compressed air, wherein the return flow of compressed air from a Liquid separator can be reliably prevented in the compressor block. This should in particular improve the efficiency of the compressor.
- the pressure line, the liquid separator, and the return line in particular form part of a fluid circuit of the compressor, wherein the injected liquid can serve for lubrication and / or cooling of the compressor block.
- the liquid may be oil or water.
- the supply point may be provided in the intake area of the compressor block, in the compressor housing, on a bearing cap, in particular at a position after intake and before reaching the compression end pressure, on a liquid injection line, which in particular forms a portion of the return line, or on a mechanical seal of the compressor block.
- the feed point is (immediately) upstream or downstream an intake valve of the compressor block is provided.
- the supply point can be provided in the range of an atmospheric pressure level (eg in the intake area) or in the region of an intermediate pressure level, ie a pressure level above the atmospheric pressure but below the compression end pressure, for example on the compressor housing, on a bearing cap, on a liquid injection line, or on one Mechanical seal of the compressor block.
- the extraction point is in particular a collection point for separated liquid in the fine separator and preferably arranged in a, opposite to the direction of gravity, the upper region of the liquid separator.
- the return line is preferably connected to the separating vessel in a lower region of the liquid separator.
- the compressor block is in particular connected to a drive, in particular a motor, can be connected or coupled to be driven. Alternatively, instead of compressing air, the compressor block could be designed to compress another gas, in particular nitrogen or helium.
- the suction line connects the suction point to a feed point for supplying (feeding) the extracted liquid or the medium flowing in the suction line (back) to the compressor block.
- a medium flowing in the suction line can be a named liquid or compressed air or a mixture of liquid and compressed air.
- An aspirated liquid flowing in the suction line can be formed as a two-phase flow of liquid and compressed air, for example a shape of air bubbles mixed with compressed air.
- the suction line can also (temporarily) only be traversed by compressed air.
- a media change a transition from a flowing medium, e.g. B. the injected liquid, to another flowing medium, eg.
- a change of media can also be reversed, that is, in particular, be carried out by the generated compressed air or a liquid-compressed air mixture to the injected liquid.
- a change of media takes place in the suction line when the liquid deposited at the suction point has been (almost) completely sucked off and compressed air flows into the suction line due to a pressure gradient between the suction point and a feed point of the suction line.
- a media change sensor is in particular designed to detect a media change on the basis of a detection of a property of the flowing medium.
- the media change sensor detects the volume flow (or the mass flow) of the flowing medium, and is in particular designed to distinguish on the basis of the detected volume flow, the flowing in the suction line media.
- a volume flow that changes suddenly or continuously (temporally) can indicate a change of media.
- a predetermined proportion of compressed air in the volume flow of the medium flowing in the suction line could serve as a criterion for a media change, in particular as a threshold value for the detection of a media change.
- the media change sensor is in particular an electronic sensor and can be based on various physical measuring principles, for example a capacitive, calorimetric, optical or acoustic measuring principle and a detection of a pressure of the medium or of vibrations or oscillations.
- the media change sensor can be a system of several sensors, each of which can be based on different measurement principles.
- the output of a media change sensor is preferably a digital signal, but may also be an analog signal.
- the media change sensor can be designed to generate and transmit media change data, which may include, for example, information about the presence of a certain medium (yes / no) or a volume fraction of a particular medium in the suction line as well as physical parameters of the medium flowing in the suction line.
- the media change sensor may be wired or wireless, in particular via a radio link to be connected to the control unit, wherein an output signal to the control unit of the compressor and / or an external control unit can be transmitted.
- the media change sensor can in particular be a flow sensor for detecting a changing volume flow of the medium in the suction line.
- the control of the valve is preferably carried out based on an output signal of the medium change sensor received by the control unit.
- the control unit comprises in particular a computing unit, for example a CPU or a microprocessor, and can output control commands for an electronically controllable valve or electrical control signals for an electrically controllable valve.
- the flow rate of a medium through the suction line can be regulated via the valve.
- the suction can be fully opened or released by the valve and completely closed or blocked, preferably at least substantially air or liquid-tight.
- the valve according to the invention is in particular not a check valve.
- a compressor according to the invention has the advantage that the suction line is only released as needed as long as it is possible to actually aspirate liquid. As soon as the media change sensor detects a media change from liquid to compressed air, the suction line can be blocked by the valve. In this way, the efficiency-reducing return flow of compressed air is reliably prevented in the compressor block or at least largely avoided. The deposited at the suction liquid is sucked as needed. In addition, the suction line can thereby be dimensioned with a larger cross section and a larger pressure gradient, whereby the operating reliability is increased.
- a known from the prior art check valve in the suction can be omitted because the suction in the operating conditions of the compressor, in which the pressure gradient could reverse over the suction, for example, when switching from load to standstill, or emergency stop, by the Valve can be safely blocked.
- the reliability continues to increase. Overall, the reliability is increased and improved efficiency by a compressor according to the invention with a media change sensor and a controllable valve.
- the media change sensor is arranged at least partially in the suction line and / or designed to detect a change in a physical parameter of the flowing medium in the suction without contact.
- the medium change sensor can be arranged partially or completely in the suction line in order to be in contact with the medium flowing in the suction line for the purpose of detecting a physical parameter or by a physical parameter of the type described in US Pat Suction line flowing medium to detect contactless.
- the media change sensor can alternatively be arranged outside the suction line, preferably on or on the suction line, in order to detect a physical parameter of the medium flowing in the suction line without contact.
- the medium change sensor can be arranged, for example, as a calorimetric sensor, optical sensor, in particular a reflection or turbidity sensor, or as a vibration or vibration sensor in the suction line, ie in contact with the medium.
- a media change sensor as a capacitive sensor or an acoustic sensor, in particular an ultrasonic sensor or as a microphone, be designed to measure without contact, ie without direct contact with the medium.
- a media change sensor may be a sensor based on different measurement principles.
- the media change sensor may be a capacitive sensor.
- a calorimetric sensor may be adapted to detect a media change.
- a reflection sensor comprises, in particular, a sensor head with a plastic hemisphere and an infrared sensor and receiver. When wetting the hemisphere with the medium, the refractive index or the reflection behavior for the reflection sensor can change detectable. With a turbidity sensor, a change in the absorption behavior of the flowing medium can be detected.
- An ultrasound sensor in particular emits an ultrasound signal and evaluates the ultrasound echo. A change in the echo due to a changed transit time or a changed reflection or damping behavior can indicate a change of media.
- a similar sensor could be based on the TDR (Time Domain Reflectometry) method, especially in the microwave spectrum.
- a microphone as a media change sensor could detect a change in the flow noise in the suction line caused by a media change.
- a vibration or vibration sensor could be a, z.
- Fork-shaped, vibratory element e.g. be excited by a piezoelectric crystal to vibrate, with a change in the medium flowing through the element, could indicate a change in media by changing the resonant frequency.
- a media change sensor may include one or more pressure sensors.
- the media change sensor is adapted to a proportion of compressed air in the volume flow of the medium in the To detect suction and detects a media change, especially at a detected compressed air content of more than 10%, preferably more than 20%, more preferably more than 30%, more preferably more than 40%, more preferably more than 50%.
- a media change sensor can generate an output signal which represents or indicates a medium change and, in particular, transmits it to the control unit.
- the medium change sensor is designed as a first pressure sensor for detecting a pressure in the suction line, wherein a nozzle is provided upstream of the pressure sensor in the suction line, the compressor (100) in particular at least one second pressure sensor (42, 43). , preferably upstream of the nozzle (21).
- the second pressure sensor is, for example, a sensor for detecting an operating pressure, e.g. within the separator tank.
- the first and second pressure sensors are in particular connected to the control unit.
- the control unit may be configured to determine a change in the pressure difference between the pressures detected by the first and second pressure sensors.
- a (temporal), in particular abrupt, change in the pressure difference due to a change in the pressure drop across the nozzle can indicate a change of media in the suction line.
- a media change sensor with pressure sensors and a nozzle has the advantage that the implementation is easy and low maintenance, especially if a second pressure sensor in a compressor or a compressor system is already present.
- the valve releases the suction line in a release position for the medium and blocks it in a blocking position for the medium, wherein the valve is designed in particular as an electrically controllable 2/2-way valve, preferably as a solenoid valve.
- the valve can also be designed as a proportional valve or as a 3/2-way valve.
- the valve is designed as a, preferably continuously, controllable proportional valve, wherein in particular in an idling operation of the compressor intermediate positions of the proportional valve between a release position and a blocking position are adjustable by the control unit.
- a proportional valve is advantageous for an idle control of the compressor, in which an idle pressure level by a proportional valve, preferably continuously, is adjustable.
- an idle control of the compressor can be implemented, in which the idling pressure or the liquid injection volume flow is reduced, in particular until a rise in the compression end temperature is detected by a temperature sensor.
- the control unit is designed to switch the valve from the blocking position to the release position after a predetermined blocking time interval, wherein the blocking time interval is preferably determined based on the generated compressed air volume flow of the compressor.
- a generated compressed air volume flow (delivery quantity) could be determined based on a rotational speed of the compressor or the intake volume flow.
- an aspirated volume flow could be determined from the run-time under load.
- the compressor may include a speed sensor for detecting the speed of the compressor and / or a flow sensor for detecting the intake volume flow.
- a blocking time interval may be a stored (stored) fixed or variably determined, for the control unit to be calculated, in particular by the control unit to be calculated value for a period of time. By a suitably selected blocking time interval ensures that after an obstruction of the suction due to a detected media change the now accumulated at the suction point liquid can be sucked.
- the compressor has at least one pressure sensor for detecting an operating pressure and / or a flow sensor for detecting the liquid volume flow in the suction line, wherein the control unit is designed in particular, at least on the basis of a detected operating pressure and / or a detected liquid volume flow Locking period and / or a Absaugzeitintervall to determine.
- a determination or calculation of a blocking time interval can be based on detected system parameters of the compressor, for example on the operating pressure, the volume flow of the suction line, a delivery quantity of the compressor, a nominal value for a drainage value (so-called “inner drainage”). and / or in the maximum volume in the fine separator, in particular on the "dry side" of the fine separator.
- internal drainage can be understood as meaning a liquid volume flow per compressed air volume flow (amount of liquid per delivery quantity) which accumulates in the fine separator, in particular on the "dry side" of the fine separator.
- a value stored in the control unit, a function, a map or a measured value can be understood.
- the lock time interval may be adjusted based on a given or generated compressed air flow rate (ie, a generated delivery rate profile). In this way, the oil accumulated at the suction point within this blocking time interval can be reliably sucked off, in particular so as not to exceed a permissible maximum volume of the separated liquid accumulated at the suction point. As soon as the media change sensor detects a media change, the suction line can be blocked again.
- control unit is adapted to detect a release time interval for the suction, preferably from a switching time of the valve from the blocking position to the release position, and in particular to compare with a predetermined Absaugzeitintervall to preferably a warning or interference signal generate if the release time interval falls below or exceeds the extraction time interval.
- a predetermined buffer time interval can be taken into account in addition to the Absaugzeitintervall.
- the control unit in particular comprises a time detection unit for detecting the release time interval, which can be understood as the actual release duration of the suction line.
- a suction time interval may be understood as a period of time that would be required for trouble-free operation of the suction line to draw a cumulative amount of liquid.
- the Absaugzeitintervall can be determined or calculated from previously mentioned operating parameters of the compressor.
- a warning signal can be generated optically (warning lamp or LED) or acoustically (warning tone) or an error message issued by the control unit or a maintenance message.
- a warning or interference signal is generated in particular in the case of a blockage of the suction line or in case of malfunction of the media change sensor. As a result, the reliable operation of the compressor can be monitored or restored.
- control unit is designed to determine a drainage value, in particular based on the detected release time interval for the suction line and a detected liquid volume flow in the suction line, and to compare with a predetermined drainage threshold, preferably a warning or interference signal when the drainage value is less than or greater than the predetermined drainage threshold.
- a drainage value also referred to as "inner drainage” can be understood as meaning a liquid volume flow per compressed air volume flow which accumulates in the fine separator, in particular on the "dry side" of the fine separator. in particular the proportion of the liquid to be separated from the compressed air volume.
- the fine separator is arranged in the separation vessel of the liquid separator, wherein the fine separator preferably has at least one filter for fine separation of liquid from the compressed air generated, wherein the suction point is provided in particular downstream of the filter.
- the fine separator can also be arranged outside the separating container of the liquid separator, for example as an outer separator cartridge.
- the liquid separator is constructed in two stages, wherein in a first stage, a pre-separation, preferably by gravity, and in the second stage, a fine deposition, preferably by filtering, takes place.
- liquid deposited in the fine separator upstream of the filter can flow back into the separation vessel, in particular drain off.
- the suction line is connected to a feed point upstream of an inlet valve of the compressor, in particular of an inlet valve disk.
- the suction line can be used additionally or alternatively to the suction function for an idle control and / or a bleed control of the compressor.
- the suction line is connected to a feed point of a liquid-lubricated sealing system, preferably a mechanical seal, of the compressor block, wherein preferably a branching from the return line to the suction seal supply line is provided, wherein the seal supply line is connected in particular to the valve, preferably is designed as a 3/2-way valve, wherein the suction line and / or the seal supply line in particular each have at least one nozzle.
- a common nozzle for the suction and the seal supply line may be provided.
- a nozzle may also be provided in the form of a nozzle bore, in particular integrated into a component of the compressor, wherein the nozzle bore is, in particular, determining the cross-section.
- the media change sensor may be located downstream or upstream of the valve.
- the mechanical seal is provided in particular on the drive side of the compressor block, preferably in a passage opening for the drive or rotor shaft of a compressor element, in particular screw rotor, in the housing of the compressor block.
- the method comprises a step of releasing the suction line by actuating the valve by the control unit after a predetermined blocking time interval has elapsed.
- the blocking time interval can be calculated and stored by a computing unit of the control unit based on detected and / or stored operating parameters of the compressor. Alternatively, a fixed predetermined value can be read out for a blocking time interval.
- the process is repeated cyclically, wherein the control unit may provide that for a particular operating condition of the compressor deviated from the method or the method is suspended, in particular in which outputs the control unit independent of the output signal of the media change sensor control commands to the valve in particular during an idle control or a bleed control.
- the inventive method has similar advantages, as have already been described in connection with the compressor according to the invention.
- the method can be carried out by the compressor according to the invention.
- the method may further implement some or all of the process features described in the context of the compressor. The method allows a compressor to operate more reliably and efficiently.
- a further embodiment of the method according to the invention for controlling a compressor, in particular screw compressor, in particular a compressor according to the invention, with a compressor block with liquid injection, one via a pressure line to the compressor block connected liquid separator with a separating vessel and a fine separator, and a return line for returning separated liquid from the separation vessel in the compressor block comprises an idle control of the compressor, wherein the following step is provided: releasing a suction line between a suction of the Feinabscheiders and a feed point of the compressor block by controlling a controllable valve arranged in the suction line, in particular if the compressor has reached a predetermined operating state, in particular a predetermined temperature, preferably at least a predetermined proportion of a predetermined liquid injection temperature or a predetermined final compression temperature.
- the suction line is preferably connected to a feed point upstream of an inlet valve of the compressor, in particular of an inlet valve disk.
- the method further provides for detecting an operating state, in particular an operating temperature, of the compressor by means of a temperature sensor, and preferably a comparison with a setpoint temperature.
- An operating temperature may be, for example, a compression end temperature of the compressed liquid-compressed air mixture or a liquid temperature (oil temperature) of the liquid to be injected (oil), or a percentage, for. B. 70%, 80% or 90%, to reach a target temperature.
- the idle control has the advantage that a further, in particular lower, idle pressure level for idle operation of the compressor can be achieved.
- an idle control of the compressor is further provided with the following step: blocking the suction line by controlling the valve, in particular if the compressor has not reached a predetermined operating state.
- an operating condition can be understood, during which the drive (drive motor) continues to drive the compressor block, but no compressed air is fed into the network.
- the inlet valve can be closed except for a small minimum opening in order to keep the amount of air to be compressed as low as possible.
- a vent valve may be opened between the liquid separator, preferably its dry side, and the atmosphere to reduce the pressure level to a pressure level which ensures safe operation of the compressor, which may be referred to as the idle pressure level.
- an idle pressure level is between 1.0 to 1.8 bar (gauge pressure).
- the suction line is preferably connected to a supply point upstream of an inlet valve of the compressor, in particular of an inlet valve disk.
- the release of the suction line by driving the valve for suction of the liquid in the load run is only performed when the compressor is running at full load or runs in a speed range above a predetermined minimum speed.
- a minimum speed is for example between 70% and 100%, preferably between 80% and 100%, more preferably between 90% and 100% of a maximum speed of the compressor.
- a change of the compressor to idle or standstill can be predicted by an evaluation of the current operating pressure and the pressure gradient. If the current operating pressure in the load run is only slightly below the setpoint operating pressure and continues to rise, it is to be expected that the compressor will shortly change from load run to idle or standstill.
- FIG. 1 shows a first embodiment of a compressor 100, which is designed here as an oil-injected screw compressor, the following description is also applicable to water-injected screw compressor.
- a drive motor 3 drives z. B. via a drive shaft, a belt drive or a gearbox mounted in a housing of the compressor block 4 screw rotors (not shown).
- the compressor block 4 sucks in ambient air through the inlet valve 2 from an air inlet 31 via the air filter 1 and the suction line 51.
- the hot air is compressed by injection of oil for lubrication and cooling in the compressor block 4.
- the intake valve includes a check valve, a 2/2-way valve and a throttle connected in parallel.
- liquid-compressed air mixture is conveyed via the pressure line 52 into the liquid separator 5 (oil separator).
- the majority of the oil is separated by gravity, and possibly by centrifugal forces due to a rotating liquid-compressed air mixture, from the air stream in a first separation stage and collects in the lower part of the separation tank 6.
- the compressed air purified in the liquid separator 5 passes via an outlet line 58, a minimum pressure check valve 11 and an air cooler 12 to a compressed air outlet 32, where the compressed air generated is a compressed air network or a consumer is made available.
- the network pressure is detected via a pressure sensor 43.
- the pressure in the separation tank 6 is detected by the pressure sensor 42.
- a temperature sensor 41 for detecting the compression end temperature (compressor discharge temperature) is provided on the pressure line 52.
- a control line 59a and a vent line 59b branch off to a combined control / vent valve.
- a silencer 16 is arranged in the vent line 59 b.
- the liquid separator 5 is formed in two stages.
- a fine separator 7 is arranged, which has one or more filters, for example in the form of at least one ⁇ labscheidepatrone.
- the liquid (oil) separated in the fine separator 7 collects at a suction point 33 of the fine separator 7.
- a suction line 56 which could also be referred to as a drainage line, in order to feed liquid separated in the fine separator back to the compressor block 4.
- a medium change sensor 18, a controllable valve 19 and a muffler 20 are arranged.
- the suction line 56 opens into the suction line 51 upstream of the inlet valve 2, in particular upstream of an inlet valve disk, at a feed point 34.
- the medium change sensor 18 is arranged upstream of the valve 19.
- the valve 19 is designed as a 2/2-way valve, here as an electrically controllable solenoid valve that regulates the flow rate in the suction line 56 insofar as it in a release position, the suction line 56 (completely) releases or opens and in a blocking position, the suction line 56 (completely) locks or closes.
- the valve 19 is shown in the blocking position, in which the 2/2-way valve is energized.
- the valve 19 is controllable or switchable via the control unit 60.
- the media change sensor 18 may be based on various physical measurement principles and be designed both as a non-contact measuring sensor or be arranged in the suction line 56 in contact with the flowing medium.
- the medium change sensor 18 is designed as a pressure sensor. Upstream of the pressure sensor 18, a nozzle 21 is provided. By means of a second pressure sensor upstream of the nozzle 21, for example pressure sensor 42 for detecting the operating pressure, the control unit 60 can a pressure difference which changes during a change of media is detected via the nozzle 21, which indicates a change of media.
- the valve 19 is shown in the release position, so that liquid can be sucked through the suction line 56.
- An operating pressure of the compressor 100 is for example between 3 and 15 bar (overpressure relative to the environment), but may also be higher.
- the media change sensor 18 detects a change of the medium flowing in the suction line 56 of liquid (oil) to compressed air or a liquid-compressed air mixture with a relatively high compressed air content
- the medium change sensor 18 generates a corresponding output signal via a connecting line 61 to the control unit 60 is transmitted.
- the control unit 60 can control the valve 19 via a connecting line 61 based on this output signal in order to switch it from a release position to a blocking position.
- the suction medium 56 for the flowing medium is blocked and flow to the compressor block 4 is reliably prevented.
- the valve 19 is switched from a blocking position back into a release position to allow a suction.
- the lock time interval may be a fixed predetermined period of time or a period variably calculated based on one or more detected or stored parameters in the controller 60.
- a release time interval detected by the control unit 60 exceeds a predetermined suction time interval, for example, in the case of clogging of the suction pipe 56 or malfunction of the medium change sensor 18, the control unit 60 may output a warning or noise signal.
- a Absaugzeitintervall corresponds to a theoretically required period of time for a suction of the accumulated at the suction point 33 liquid with properly functioning suction line 56th
- the suction line 56 can be used in the idle of the compressor 100 as an additional line for the promotion (circulation) of compressed air, wherein the line cross-section increases overall and the idle pressure level is thereby lowered.
- the control unit 60 can switch the valve 19 in the idling mode to a release position, in particular independently of the output signal of the medium change sensor 18.
- a return flow of compressed air through the suction line 56 is desirable when idling.
- the valve 19 is designed as a proportional valve
- the flow rate through the suction line 56 can be controlled steplessly by corresponding intermediate positions of the valve, so that an idling pressure level matched to the operating state of the compressor 100 is adjustable.
- Such an idle pressure level is between a low idle pressure level established with the exhaust passage 56 released and a higher idle pressure level established with a trapped exhaust passage 56.
- an improvement of the efficiency in the form of a reduced idle power loss can be achieved by a corresponding idling control.
- the suction line 56 can be used for venting of the compressor 100, with a release of the suction line 56 through the valve 19, a faster venting is achieved. Once a certain residual operating pressure of e.g. 2.0 bar is reached, the suction line 56 can be blocked to reduce the ventilation speed and prevent foaming of the oil.
- FIG. 3 shows an embodiment of a compressor 100 according to the invention, in which the suction line 56 at a feed point 34 downstream of the Inlet valve 2 opens into the compressor block 4. Except for in connection with the embodiment according to FIG. 1 described idle control and vent control, the operation of the compressor 100 is the same. There is no silencer provided in the suction line. In particular, the problem of wetting the air filter or the suction area of the compressor block 4 in this embodiment can not occur by design.
- FIG. 4 shows an embodiment of a compressor 100 according to the invention, in which the suction line 56 is connected to a feed point 34 of a mechanical seal of the compressor block 4.
- the return line 53 or the section of the liquid injection line 54 leads the majority of the liquid returned from the liquid separator 5 back into the compressor block 4 for injection, similar to FIGS FIGS. 1 . 2 and 3 .
- a seal supply line 57 branches off to the suction line 56, wherein the liquid volume flow in the seal supply line 57, (in particular) by a suitable choice of the line cross-sections or a nozzle, (less) than the liquid volume flow in the liquid injection line 54.
- the seal supply line 57 is connected to the controllable valve 19, which is designed as a 3/2-way valve.
- the suction line 56 comprises a suction section 56a and a supply section 56b for supplying liquid to a mechanical seal of the compressor block 4.
- the liquid (oil) to be supplied with mechanical seal (not shown) is preferably on the drive side of the compressor block in a through hole for the drive or Rotor shaft of a screw rotor provided in the housing of the compressor block.
- a nozzle 21 for adjusting the pressure levels and the volume flows in the lines is provided in each case.
- liquid is passed from the seal supply line 57 via the nozzle 21 to the mechanical seal.
- liquid is passed from the fine separator 7 via the strainer 17 and a nozzle 21 to the mechanical seal until the medium change sensor 18 detects a change of media in the suction line 56.
- a separate seal supply line 57 in particular instead of provided in the housing of the compressor block 4 supply holes, a very accurate dosing and adjustment of the supplied liquid flow to supply the Mechanical seal possible.
- the amount of the supplied liquid can be reduced. The efficiency of the compressor 100 can be further improved.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18150650.2A EP3508729B1 (fr) | 2018-01-08 | 2018-01-08 | Compresseur pourvu de conduite d'aspiration et procédé de commande d'un compresseur |
FIEP18150650.2T FI3508729T3 (fi) | 2018-01-08 | 2018-01-08 | Imujohdolla varustettu kompressori ja menetelmä kompressorin ohjaamiseksi |
PCT/EP2018/086819 WO2019134869A2 (fr) | 2018-01-08 | 2018-12-21 | Compresseur à conduite d'aspiration et procédé de commande d'un compresseur |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18150650.2A EP3508729B1 (fr) | 2018-01-08 | 2018-01-08 | Compresseur pourvu de conduite d'aspiration et procédé de commande d'un compresseur |
Publications (2)
Publication Number | Publication Date |
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EP3508729A1 true EP3508729A1 (fr) | 2019-07-10 |
EP3508729B1 EP3508729B1 (fr) | 2024-06-05 |
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Application Number | Title | Priority Date | Filing Date |
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EP18150650.2A Active EP3508729B1 (fr) | 2018-01-08 | 2018-01-08 | Compresseur pourvu de conduite d'aspiration et procédé de commande d'un compresseur |
Country Status (3)
Country | Link |
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EP (1) | EP3508729B1 (fr) |
FI (1) | FI3508729T3 (fr) |
WO (1) | WO2019134869A2 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021180797A1 (fr) * | 2020-03-10 | 2021-09-16 | Atlas Copco Airpower N.V. | Système de récupération de lubrifiant |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019003484B4 (de) * | 2019-05-17 | 2024-10-17 | Baumer Electric Ag | Vorrichtung zum Erfassen eines Medienwechsels in einer Leitung |
CN112576490B (zh) * | 2020-11-27 | 2023-02-17 | 苏州寿力气体设备有限公司 | 一种移动式空压机的控制方法和装置 |
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US2701684A (en) * | 1953-10-23 | 1955-02-08 | Worthington Corp | Oil circulating system for rotary fluid compressors |
US4070166A (en) | 1975-01-24 | 1978-01-24 | Atlas Copco Aktiebolag | Method and device for driving liquid from a liquid separator |
EP0744550A2 (fr) | 1995-05-25 | 1996-11-27 | Compair Broomwade Ltd. | Recirculation d'huile dans des compresseurs à vis |
US6116046A (en) * | 1999-03-05 | 2000-09-12 | American Standard Inc. | Refrigeration chiller with assured start-up lubricant supply |
EP1669607A2 (fr) * | 2004-12-13 | 2006-06-14 | Ingersoll-Rand Company | Système de lubrification avec filtration d'acide pour un compresseur |
WO2007076213A1 (fr) * | 2005-12-23 | 2007-07-05 | Gardner Denver, Inc. | Compresseur a vis avec systeme d'injection d'huile |
CN103306981A (zh) * | 2012-03-12 | 2013-09-18 | 上海斯可络压缩机有限公司 | 双螺杆空压机 |
WO2013153970A1 (fr) * | 2012-04-09 | 2013-10-17 | 株式会社神戸製鋼所 | Dispositif compresseur refroidi à l'huile à deux étages |
US20150343365A1 (en) | 2014-05-28 | 2015-12-03 | Ingersoll-Rand Company | Compressor system and oil separation system |
WO2017174129A1 (fr) * | 2016-04-06 | 2017-10-12 | Bitzer Kühlmaschinenbau Gmbh | Ensemble compresseur de fluide réfrigérant |
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2018
- 2018-01-08 EP EP18150650.2A patent/EP3508729B1/fr active Active
- 2018-01-08 FI FIEP18150650.2T patent/FI3508729T3/fi active
- 2018-12-21 WO PCT/EP2018/086819 patent/WO2019134869A2/fr active Application Filing
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
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US2701684A (en) * | 1953-10-23 | 1955-02-08 | Worthington Corp | Oil circulating system for rotary fluid compressors |
US4070166A (en) | 1975-01-24 | 1978-01-24 | Atlas Copco Aktiebolag | Method and device for driving liquid from a liquid separator |
EP0744550A2 (fr) | 1995-05-25 | 1996-11-27 | Compair Broomwade Ltd. | Recirculation d'huile dans des compresseurs à vis |
US6116046A (en) * | 1999-03-05 | 2000-09-12 | American Standard Inc. | Refrigeration chiller with assured start-up lubricant supply |
EP1669607A2 (fr) * | 2004-12-13 | 2006-06-14 | Ingersoll-Rand Company | Système de lubrification avec filtration d'acide pour un compresseur |
WO2007076213A1 (fr) * | 2005-12-23 | 2007-07-05 | Gardner Denver, Inc. | Compresseur a vis avec systeme d'injection d'huile |
CN103306981A (zh) * | 2012-03-12 | 2013-09-18 | 上海斯可络压缩机有限公司 | 双螺杆空压机 |
WO2013153970A1 (fr) * | 2012-04-09 | 2013-10-17 | 株式会社神戸製鋼所 | Dispositif compresseur refroidi à l'huile à deux étages |
US20150343365A1 (en) | 2014-05-28 | 2015-12-03 | Ingersoll-Rand Company | Compressor system and oil separation system |
WO2017174129A1 (fr) * | 2016-04-06 | 2017-10-12 | Bitzer Kühlmaschinenbau Gmbh | Ensemble compresseur de fluide réfrigérant |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2021180797A1 (fr) * | 2020-03-10 | 2021-09-16 | Atlas Copco Airpower N.V. | Système de récupération de lubrifiant |
BE1028138B1 (nl) * | 2020-03-10 | 2021-10-11 | Atlas Copco Airpower Nv | Smeermiddelrecuperatiesysteem en vacuümsysteem omvattende dergelijke smeermiddelrecuperatiesysteem |
US12104597B2 (en) | 2020-03-10 | 2024-10-01 | Atlas Copco Airpower N.V. | Vacuum pump lubricant recovery system returning lubricant from the air filter based on pressure measurements in the vacuum pump |
Also Published As
Publication number | Publication date |
---|---|
WO2019134869A3 (fr) | 2020-01-02 |
EP3508729B1 (fr) | 2024-06-05 |
WO2019134869A2 (fr) | 2019-07-11 |
FI3508729T3 (fi) | 2024-09-03 |
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