• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A vacuum unit (11), a vacuum cleaning system (1) and a method for controlling a vacuum unit (11) is presented. The vacuum unit (11) comprises a compressor suction pump (30), an air valve. (36) arranged at the inlet (40) of the compressor suction pump (30), at least one temperature sensor (32, 33) for sensing the temperature of air flowing through the compressor suction pump (30). A control unit (34) is configured to selectively open the air valve (36) in response to the temperature, wherein surrounding air is admitted into the inlet. The vacuum cleaning system (1) comprises the vacuum unit (11), a filtering system (12), and a pipe system (13) provided with a suction nozzle (14). The method includes creating (102) a first air stream, transferring dust and particles by means of the first air stream through the pipe system, measuring (104) the temperature of the air at the vacuum unit (11), and selectively opening (106) the air valve (36) in response to the temperature, so as to cool the first air stream.Fig. 1
    公开号:SE1550432A1
    申请号:SE1550432
    申请日:2015-04-13
    公开日:2016-10-14
    发明作者:Petersson Mattias
    申请人:Disab-Tella Ab；
    IPC主号:
    专利说明:

    Vacuum unit, cleaning system and method of controlling acleaning system Technical Field The invention relates to vacuum cleaning systems for industrialuse comprising a vacuum unit, a filtering system, and a pipesystem provided with a suction nozzle. The filtering system isarranged in a suction direction between the nozzle and thevacuum unit.
    The invention also relates to a vacuum unit for an industrialvacuum cleaning system, and to a method of controlling acleaning system for sucking in and transferring dust andparticles.
    Background Known industrial vacuum cleaning systems include a vacuumunit provided with a compressor suction pump that has a highpower level in order to provide appropriate suction and air flow.The power level can be of such a magnitude that the vacuumunit may raise the temperature of the air flow significantly duringthe compression, for example the temperature may be raisedabout 50-90 degrees Centigrade. Compressor suction pumpscan be configured so that the risk that they will becomeoverheated when operating in "normal" conditions is small, suchas when operating at a room temperature of 15-25 degreesCentigrade. lf the temperature of the incoming air flow is high,the raise in temperature during compression may lead to atemperature level wherein a safe operation cannot beguaranteed. Vacuum units may comprise a safety system thatbreaks the electric supply to the vacuum unit if the temperaturebecomes too high, say above 150 degrees Centigrade.
    Working with hot dust and particles may therefore not bepossible, since the vacuum unit may be over-heated and/orunnecessarily stopped.
    Document US 2004/0258551 A1 ('551) describes a vacuumsuction pump comprising a screw-type Compressor. The screwcompressor is provided with an air cooler (35 in '551) arrangedto receive a part of the heated air from an exhaust outlet (12 in'551) of the screw compressor, and cool the air. The cooled airis returned into the screw compressor, via an in|et (37 in '551)into a receiving section (17 in '551) at the area of the exhaustoutlet (12) in order to cool the compressed air in the dischargeside. The cooler (35) prevents overheating. A disadvantage withsuch a cooling is that it requires arranging a separate cooler andarranging connections into the screw compressor. The cooling isalso not adapted for varying temperatures of the air that arrivesat the in|et.
    Summary of inventionAn object of the invention is to overcome the disadvantages ofthe prior art.
    An object of the invention is to clean an industry from hot dustand particles, by sucking in and transferring the hot dust andparticles.
    An object of the invention is to provide facilitated means forimplementing a reliable method and system for sucking in andtransferring hot dust and particles.
    An object of the invention is also to provide means for handlingvarying temperatures of the air flow.
    According to a first aspect, the present invention provides avacuum unit comprising: - a compressor suction pump having an in|et and an outlet, - a duct comprising a connection for a pipe system of a cleaningsystem, which duct is arranged at the in|et and configured toprovide an air flow path from the pipe system to the in|et. By connecting the pipe system to the inlet of the Compressorsuction pump a suction is created in the pipe system. Thevacuum unit further comprises - an air valve arranged at the duct between the inlet and thepipe system connection, which air valve is arranged toselectively admit air into the duct; - a control unit operatively connected to the air valve andconfigured to control the air valve, and - at least one temperature sensor for sensing (e.g. measuring)the temperature of air flowing through the compressor suctionpump and which temperature sensor is connected to the controlunit.
    The control unit is configured to selectively open the air valve inresponse to the temperature received from the at least onetemperature sensor.
    By configuring the control unit to control the opening and closingof the air valve, the air flow arriving at the inlet can be cooled sothat the air flow through the compressor suction pump becomescooler, the compressor suction pump is cooled, and the airflowing through the outlet becomes cooler. Thus, the vacuumunit has been especially adapted for high temperatures of thearriving air flow, such as leading to a temperature of e.g. 150degrees Centigrade at the outlet, and is suitable for use inprocesses for cleaning of hot material and hot environments.
    By configuring the control unit to selectively open the air valvebased on the sensed temperature, the air valve can be keptclosed so as not to decrease the suction power in the pipesystem when cooling is not needed. The vacuum unit maysuitable be dimensioned to operate without using the air valvewhen cleaning dust and particles of room temperature, i.e. at 15to 25 degrees Centigrade. Thus, the air inlet valve controlled bythe control unit in response to the air flow temperature makes itpossible to also suck in and transfer hot dust and particles when such cleaning is needed. ln this way the vacuum unit may beused both for room temperature cleaning and for cleaning hotareas, and thus the air valve arrangement enhances the userange for the vacuum unit.
    Arranging a duct between the in|et of the compressor suctionpump and a pipe connection, which duct is provided with an airvalve that is controlled by a control unit, simplifies modificationof existing vacuum cleaning systems without the need forreconstruction of the compressor suction pump.
    The air valve is suitable arranged to admit the atmospheric airsurrounding the vacuum unit to blend with the air streamreceived from the areas that are cleaned. The connection for apipe system can be used to arrange the vacuum unit away fromhot areas to be cleaned and to receive the incoming air streamvia the pipe system. ln an embodiment of the first aspect, the at least onetemperature sensor is configured to measure the temperature ofthe air flowing through the outlet of the compressor suctionpump, wherein the control unit is configured to open the airvalve based on the temperature of the air flow at the outlet.
    The temperature sensor is preferably arranged at the outletwhere the temperature of the vacuum unit is the highest. ln an embodiment of the first aspect, the control unit isconfigured to open the air valve in response to the temperatureexceeding a first threshold.
    The first threshold should be slightly lower, e.g. ten degreeslower, than a maximum allowed temperature of the vacuum unit.For a vacuum unit having a maximum allowed temperature forsafe operation of 150 degrees Centigrade, the first thresholdcan be set to about 140 degrees Centigrade. ln an embodiment of the first aspect, the control unit isconfigured to close the air valve in response to the temperaturefalling below a second threshold, which second threshold islower than the first threshold.
    An open air valve decreases the suction power provided by thevacuum unit, and the air valve should be closed when cooling isnot needed. The second threshold should be lower than the firstthreshold to prevent excessive opening and closing of the airvalve. A suitable level for the second threshold can be 125degrees Centigrade. ln an embodiment of the first aspect, a suitable vacuum suctionpump is a compressor suction pump selected from any of: - a rotary lobe compressor, - a screw compressor, and - a rotary displacement blower.
    Preferably, the compressor suction pump is a rotary lobecompressor. A rotary lobe compressor is more suitable to usethan a screw compressor, since the rotating lobes have a moreeven temperature, whereas a screw of a screw compressor iswarmer close to the outlet than at the inlet. Therefore, thecooling provided by air flowing from the air valve will moreefficiently cool a rotary lobe compressor.
    These types of compressors are suitable for compressor suctionpumps in order to create appropriate power. The compressorsuction pump can suitably be selected that has, or bedimensioned to provide, a vacuum level of 500 mbar to 900mbar. Air displacement blowers are also referred to as Roots-type blower or compressors, or rotary displacement blowers.Rotary lobe compressor are a special type of Roots-typecompressors. Screw compressors are also referred to asLysholm-type compressors. The compressor suction pump should be able to provide a suction suitable for industrialcleaning in contrast to domestic cleaning, and the listedcompressor types are suitable for providing comparably highvolume rates of flowing air. lt is preferred to measure the temperature at the outlet of thecompressor suction pump since the compressor suction pumpraises the temperature of the air flowing through the suctionpump due to the compression performed. However, thetemperature of air arriving at the inlet of the compressor suctionpump may be sensed, and used for controlling the selectiveopening and closing of the air valve. ln an embodiment of the first aspect, at least one of the at leastone temperature sensor is configured to measure thetemperature of the air flowing through the inlet of thecompressor suction pump, wherein the control unit is configuredto open the air valve in response to the temperature at the inletexceeding a third threshold.
    The relation between the inlet air temperature and the outlet airtemperature depends on the compression performed by thecompressor suction pump and therefore the relation can beknown, at least approximately, during use. The inlet airtemperature may be used as an alternative to using the outletair temperature. The inlet air temperature and outlet airtemperature may also be used in combination, for example as asafety measure from malfunctioning temperature measurementsat the outlet. l/leasuring the inlet air temperature also providesoperational data for monitoring the performance of thecompressor suction pump. ln an embodiment of the first aspect, the control unit isconfigured to close the air valve in response to the temperatureat the inlet falling below a fourth threshold, which fourththreshold is lower than the third threshold. ln an embodiment of the first aspect, the control unit isconfigured to stop the suction pump when reaching a maximumallowed temperature at the outlet, which maximum temperatureis higher than the first threshold.
    Thus, if enough cooling cannot be provided by opening of the airvalve, the vacuum unit may stop the compressor suction pump.For a compressor suction pump driven by motor, such as anelectrical motor or combustion engine, the control unit may beoperatively connected to the motor and adapted to switch off themotor when the temperature exceeds the maximum allowedtemperature. The control unit can, for example, be configured tobreak the electric power to the motor by means of switching offan electronically controlled power switch of the electric motor orcombustion engine, respectively. ln an embodiment of the first aspect, the vacuum unit comprisesat least one vacuum release valve. The vacuum release valvecan suitable be of a spring-loaded type arranged to open whenthe pressure at the inlet becomes too low, i.e. the vacuum levelbecomes too high. The vacuum release valve is adapted to openwhen the vacuum level exceeds the vacuum level that thecompressor suction pump is dimensioned for. ln an embodiment of the first aspect, the control unit isconfigured with a standby mode of operation, which whenactivated allows running the compressor suction pump in idlingat the same time as keeping the air valve open. ln this way, thevacuum unit can be cooled when a cleaning process is pausedby keeping the compressor suction pump running withoutsucking in and transferring dust and particles.
    According to a second aspect of the invention a vacuumcleaning system for sucking and transferring hot dust and hotparticles is provided. The vacuum cleaning system comprises - a vacuum unit according to the first aspect of the invention, - a filter system, and - a pipe system provided with a suction nozzle, wherein the pipesystem is connected to the suction side connection of thevacuum unit and wherein the filter system is arranged in an airflow direction between the nozzle and the vacuum unit.
    Embodiments of the second aspect comprises the describedembodiments of the first aspect.
    The vacuum unit is suitably arranged in an area of an industrialplant that has a lower temperature than an area with hot dustand particles that are cleaned. ln an embodiment of the second aspect, the vacuum unit isarranged outdoors, the pipe system extends into a building andthe suction nozzle is arranged for sucking in hot dust and hotparticles inside the building.
    The vacuum unit including the air valve can be arranged outsidethe building to selectively admit the air outside the building intothe duct in order to cool the air flow. Arranging the vacuum unitoutside a building with a pipe extending through a wall of thebuilding into hot areas, is beneficial compared to incorporatingcooling equipment in the vacuum cleaning system. The airtemperature outside the building can be utilized and in this waya vacuum cleaning system with a compressor suction pumpdimensioned for normal room temperatures can be utilized alsofor cleaning hot material. ln an embodiment of the second aspect,comprises a pre-separator and a filter unit. the filter system According to a third aspect, the present invention provides amethod for controlling a vacuum cleaning system, especiallytransferring hot dust and particles by means of the vacuum cleaning system. The method preferably controls a vacuumcleaning system that comprises - a vacuum unit comprising a compressor suction pump havingan in|et and an outlet, a control unit, and at least onetemperature sensor, - a pipe system provided with a nozzle for sucking in the dustand particles, - a filtering system for separating dust and particles, whereinsaid pipe system connects the nozzle to the vacuum unit, andwherein the filtering system is arranged in an air flow directionbetween the nozzle and vacuum unit, and wherein the vacuumunit further comprises a duct at the in|et of the compressorsuction pump, which duct connects the in|et to the pipe systemand which duct comprises an air valve.
    The method according to the third aspect of the inventioncomprises: - creating a first air stream for sucking in and transferring dustand particles, which first air stream extends from the nozzle tothe vacuum unit, - sucking in dust and particles, preferably hot dust and particles,by means of the nozzle, - transferring the dust and particles through the pipe system, inorder to filter out the dust and particles by means of the filteringsystem, - measuring the temperature of the air at the vacuum unit, - selectively opening the air valve in response to thetemperature, wherein a second air stream is provided, whichsecond air stream blends with the first air stream at the in|et ofthe vacuum unit so as to cool the first air stream. ln an embodiment of the third aspect, the measuring of thetemperature comprises measuring the temperature at the outletof the vacuum unit. ln an embodiment of the third aspect, the opening of the airvalve is performed when the temperature, e.g. at the outlet,exceeds a first threshold.
    An embodiment of the third aspect further comprises closing theair valve when the measured temperature falls below a secondthreshold. Preferably, the second threshold is lower than thefirst threshold.
    An embodiment of the third aspect includes controlling thevacuum cleaning system in a standby mode in order to cool thecompressor suction pump when pausing from sucking in andtransferring dust and particles. The standby mode comprisesrunning/idling the compressor suction pump and keeping the airvalve open.
    Description of drawings Fig. 1 is a side view of vacuum cleaning system; Fig. 2 is a perspective view of the vacuum cleaning system infig. 1; Fig. 3 is a side view of a vacuum unit; Fig. 4 is a perspective view of the vacuum unit of fig. 3; Fig. 5 illustrates, schematically, details of a pump of the priorart, which shares design features with a first embodiment of acompressor suction of a vacuum unit of the invention; Fig. 6 illustrates an embodiment of a duct suitable for a vacuumunit in accordance with the invention; Fig. 7 illustrates a method of controlling a vacuum unit; Fig. 8 illustrates a method of controlling a vacuum cleaningsystem.
    Detailed description Fig. 1 illustrates a vacuum cleaning system 1 for cleaning anindustrial plant by sucking and transferring particles and dust,especially hot particles and hot dust, from for example a castingmold 2. The vacuum cleaning system comprises a vacuum unit 11 11, a filtering system 12, a pipe system 13a-e that includes aflexible steel hose 13d, and a movable end section 13e providedwith a suction nozzle 14. The end section 13e is maneuvered byan industrial robot 20 in order to remove hot particles and dustfrom the mold 2 by sucking in and transferring the dust andparticles through the pipe system, sections 13d, 13c, to thefiltering system 12. The pipe system 13a-e connects the vacuumunit 11 to the nozzle 14 via the filtering system 12, in order toprovide a vacuum suction at the nozzle 14 and provides adirection of the flow of air from the nozzle 14 through thefiltering system 12 and further to the vacuum unit 11.
    The filtering system 12 comprises a pre-separator 12a and afilter unit 12b. A respective container or bag 16a, 16b isarranged below the pre-separator 12a and the filter unit 12b tocollect dust and particles from each respective unit 12a, 12b.
    The pipe system 13a-e comprises a first section, or end section,13e provided with the nozzle 14, a maneuverable steel hose 13dand a second pipe section 13c arranged from the steel hose 13d14 to the filtering system 12. A third pipe section 13b isarranged between the pre-separator 12a and the filter unit 12b.A fourth pipe section 13a, exemplified as two individual pipes,connects the filtering unit 12b of the filtering system 12 to thevacuum unit 11.
    The components in the interior of the vacuum unit 11 areillustrated in more detail in figs. 3-4.
    The vacuum unit 11 comprises a compressor suction pump 30,which is driven by an electric motor 31. The vacuum unit 11comprises a temperature sensor, the outlet temperature sensor33, arranged at the outlet (50 in fig. 5) of the compressorsuction pump 30, and a temperature sensor, or inlet temperaturesensor 32, arranged at the inlet (40 in fig.5) of the compressorsuction pump 30. The temperature sensors 32, 33 are arranged 12 inside the inlet and outlet, respectively, and arranged to sensethe temperature of the incoming and outgoing air stream,respectively. The vacuum unit 11 has two pipe connections 35,or alternatively only one pipe connection, for connecting theinlet of the compressor suction pump 30 to the pipe system 13.The vacuum unit 11 also comprises an air valve 36 forselectively admitting surrounding air to the inlet (40 in fig. 5) ofthe compressor suction pump 30. The vacuum unit 11 comprisesa control unit 34 configured to control the air valve 36 based onthe temperature at the outlet (50 in fig. 5) of the compressorsuction pump 30, as measured by the outlet temperature sensor33.
    An air filter 39 is arranged to filter the air flow entering at thepipe connections 35 and the air valve 36 before the air flowreaches the inlet (40 in fig. 5) of the compressor suction pump30. The air filter 39 is arranged in a compartment of the vacuumunit 11, which compartment forms an air duct 38 (see 38 in fig.6), which air duct extends between the air valve 36, the pipeconnection 35 and the inlet 40 of the compressor suction pump30.
    As illustrated in fig. 4, the vacuum unit 1 preferably alsocomprises safety valves, or vacuum release valves 37, whichare spring-loaded in order to open if the vacuum (or underpressure) in the vacuum unit 11, becomes too low. The vacuumrelease valves 37 can suitably be configured in dependence ofthe maximum vacuum level of the compressor suction pump 30to open at for example 50% to 90% vacuum in order to letsurrounding air into the vacuum unit 11. The vacuum releasevalves 37 are also arranged at the air duct 38 compartment.
    Fig. 4 also illustrates a pipe connection 51 for releasing outletair from the vacuum unit 30. The outlet (50 in fig. 5) of thecompressor suction pump 30 feeds the outlet air into a containerbeneath the floor of the vacuum unit 11, and the pipe connection 13 51 is arranged in the floor to convey the ejected air away fromthe vacuum unit 11 through the floor, for example by means of apipe (not shown) connected to the pipe connection 51 and actingas a chimney.
    Fig. 5 illustrates an example of a compressor suction pump 30,a so called Roots pump, which is provided with an inlet 40 forsucking in air and an outlet 50 for ejecting air. The illustratedroots pump also comprises intermediate inlets 60a-b for drawingin air in order to cool the pump, which intermediate inlets arearranged between the inlet 40 and the outlet 50 in the air flowdirection. The compressor suction pump 30, exemplified as aRoots pump, comprises two counter rotating lobes 70a-b tocompress the air. The configuration of the Roots pump issuitable for performing the invention. However, the compressorsuction pump used may, but need not, be provided with theintermediate inlets 60a, 60b as illustrated in fig. 5. Thus aRoots-pump that have an inlet 40 and an outlet 50, but nointermediate inlets can be selected as a compressor suctionpump 30 in accordance with the invention.
    An alternative to a Roots pump is to use a screw compressor asa compressor suction pump 30, which screw compressor can besimilar to the screw compressor of the previously citeddocument '551 (US 2004/0258551 A1), which, however, can beused without the cooler described in '551.
    The control unit 34 is configured to open the air valve 36, inorder to let surrounding air enter and blend with the air streamreceived from the pipe system 13, when the temperature at theoutlet 50 reaches a first temperature threshold, which firsttemperature threshold is slightly below a maximum allowedtemperature. The control unit 34 is further configured to closethe air valve 36 when the temperature at the outlet 50 falls to asecond temperature threshold below the first temperaturethreshold. Opening the air valve 36 decreases the vacuum (i.e. 14 the pressure level below atmospheric pressure) provided by thevacuum unit 11, but ensures the air flow from the vacuum unit11 does not become overheated. The air valve 36 is arranged toadmit air surrounding into the vacuum unit 11, which air shouldbe at atmospheric pressure. The vacuum unit 11, including theair valve 36, can be arranged outside an industrial buildinginside which heated materials are handled, wherein the pipesystem 13 may be arranged to extend through a wall of thebuilding.
    As an example the compressor suction pump 30 may have amaximum allowed temperature of 150 degrees Centigrade at theoutlet, and the control unit 34 may be configured to open the airvalve 36 in order to cool the inlet air stream when the outlet airstream reaches 140 degrees Centigrade. The control unit 34may be configured to close the air valve 36 when the airtemperature at the outlet falls below a second temperaturethreshold of 125 degrees Centigrade. The control unit 34 mayalso be configured to stop the compressor suction pump 30 byswitching off the electric power (not illustrated) that is fed to theelectric motor 31 when the air temperature at the outlet 50reaches the maximum allowed temperature of 150 degreesCentigrade.
    Thus, the control unit 30 selectively opens and closes the airvalve 36 so that the temperature of the outlet 50 is kept belowthe maximum temperature and controls the temperature byregulating the air flow when the outlet temperature is within arange from 125 to 140 degrees Centigrade when cleaning hotareas in for example a metal working plant, iron works plant, oraluminum smelting plant.
    The air valve 36 is an electronically controlled air valve, and canpreferably constitute an electronically controlled sliding valve.
    Fig. 6 illustrates a vacuum unit 11 comprising a Compressorsuction pump 30 having an inlet 40 and an outlet 50. A duct 38comprising a connection 35 for a pipe system 13 , is connectedto the inlet 40 of the compressor suction pump 30. An air valve36, in the form of a sliding valve 36, is arranged at the duct 38.Fig. 6 is simplified in order to illustrate main features of theinvention in a detailed embodiment. The compressor suctionpump 30 creates a first air stream through the duct 38 enteringthrough the pipe connection 35. The first air stream iscompressed by the compressor suction pump 30 and exitsthrough the outlet 50. The vacuum unit 11 may be provided withan air filter (39 in fig. 3 but not illustrated in fig.6) arranged inthe duct 38. The temperature of the first air stream rises duringthe compression, and the control unit 34 is configured toselectively admit a second air stream to enter through the airinlet valve 36 in order to lower the temperature of the incomingfirst air stream.
    The control unit 34 may be configured to provide a step wiseopening of the air valve 36, and provide a successive opening ofthe air valve 36 within a temperature range, for examplebetween 130-140 degrees Centigrade. Thus, regulating theopening of the air valve from a closed position at 130 degrees toa fully open position at 140 degrees.
    An embodiment of a method for controlling a vacuum unit 11 ofa vacuum cleaning system 1 is illustrated in figure 7.
    The method includes creating 102 a first air stream for suckingin and transferring dust and particles.
    The method includes measuring 104 the temperature of the airflow at the vacuum unit 11, especially the temperature at theoutlet 50 of the compressor suction pump 30. 16 The temperature is measured 104 during the cleaning in order todetect an overheated air flow.
    The method further includes controlling 106 the air valve 36, byselectively opening 106A and closing 106B the air valve 36 inresponse to the temperature, i.e. preferably the temperature ofthe outgoing air stream as sensed by the outlet temperaturesensor 33.
    The opening 106A includes opening the air valve 36 to the airsurrounding the vacuum unit 11, wherein a second air stream isprovided in the duct 38 in order to cool the first air stream,which second air stream blends with the first air stream and theblended air stream enters at the inlet 40 of the vacuum unit 11.The closing 106B includes closing the air valve 36 when thetemperature has decreased to a safe level, wherein the fullsuction power is provided to the pipe system of the vacuumcleaning system.
    A detailed embodiment of a method for controlling a vacuumcleaning system 1 is illustrated in figure 8.
    The method of controlling a vacuum cleaning system starts withcreating 102 an air stream by starting the compressor suctionpump 30 of the vacuum unit 11, in order to create a vacuumsuction, especially in the pipe system 13 connected to thevacuum unit 11. The end section 13e of the pipe system 13 ismaneuvered towards dust and particles to be cleaned, e.g. bymeans of an industrial robot 20. The starting of the compressorsuction pump and the maneuvering of the nozzle 14 at the endsection 13e creates 102 a first air stream for sucking in andtransferring the dust and particles, which first air stream extendsfrom the nozzle 14 to the vacuum unit 11.
    The method further includes cleaning 103 including sucking103A in the dust and particles, especially hot dust and particles, 17 by means of the nozzle 14, and transferring 103B the dust andparticles through the pipe system 13, in order to filter out 103Cthe dust and particles by means of the filtering system 12.
    The dust and particles are filtered 103C out by means of thefiltering system 12 arranged in the air flow direction of the firstair stream between the nozzle 14 and the vacuum unit 11.
    The first air stream arrives at the in|et 40, where the first airstream is compressed by means of the compressor suctionpump 30, wherein the temperature of the air flowing throughvacuum unit 11 is raised.
    The method further comprises measuring 104 the temperature ofthe air at the vacuum unit 11. The measuring 104 preferablyincludes measuring the temperature of the air flow at the outlet50. The measuring 104 may include both measuring thetemperature at the in|et 40 and the temperature at the outlet 50.
    The method further includes controlling the air valve 36including selectively opening 106A and selectively closing 106Bthe air valve 36 in response to the temperature, wherein opening106A of the air valve provides a second air stream into the duct38. The second air stream blends with the first air stream at thein|et 40 of the vacuum unit 11 so as to cool the first air stream,and thereby lower the temperature at the outlet 50.
    The controlling 106 of the air valve 36 includes selectivelyclosing 106B the air valve 36 in response to the temperature,especially the outlet air temperature. When the temperaturereaches a first threshold, the air valve 36 is opened 106A andwhen the air temperature falls to a second threshold, the airvalve 36 is closed 106B.
    The method may include stopping 108 the compressor suctionpump 30, by turning off the electric motor 31, based on the 18 temperature, especially stopping 108 the Compressor suctionpump 30 if the temperature reaches a predefined maximumtemperature. The first threshold is set lower than the allowedmaximum temperature, and the second threshold is set lowerthan the first threshold.
    The selective opening and closing 106 of the air valve 36 canalso include a partial opening and a partial closing, respectively,of the air valve 36 performed at respective third and fourththresholds. Thus, a third threshold for partial opening is setlower than the first threshold for full opening, and a fourththreshold for partial closing is set higher than the secondthreshold for fully closing the air valve. The third and fourththresholds may be set to the same temperature, the air valve 36will then be partially opened when the temperature level risesabove the third threshold and if the air valve 36 subsequently isfully opened, the air valve 36 will be partially closed when thetemperature falls below the forth threshold at the sametemperature level as the temperature for partial opening.
    Examples of a vacuum unit 11, a vacuum cleaning system 1 andmethods of controlling a vacuum unit 11 and a cleaning systemhas been presented, which are especially adapted for cleaningof hot dust and particles. The vacuum unit 11 comprises acompressor suction pump 30, an air valve 36 arranged at theinlet 40 of the compressor suction pump 30, at least onetemperature sensor 32, 33 for sensing the temperature of airflowing through the compressor suction pump 30. A control unit34 is configured to selectively open the air valve 36 in responseto the temperature, wherein surrounding air is admitted into theinlet. The vacuum cleaning system 1 comprises the vacuum unit11, a filtering system 12, and a pipe system 13 provided with asuction nozzle 14. The method includes creating 102 a first airstream, transferring dust and particles by means of the first airstream through the pipe system, measuring 104 the temperatureof the air at the vacuum unit 11, and selectively opening 106 the 19 air valve 36 in response to the temperature, so as to cool thefirst air stream.
    These examples have been provided to fascilitate enabling theinvention. The invention is however not limited to the illustratedexamples, but may be varied within the scope of the followingclaims.
    权利要求:
    Claims (19)
    [1] 1. A vacuum unit (11) comprising: - a Compressor suction pump (30) having an inlet (40) and anoutlet (50), - a duct (38) comprising a connection (35) for a pipe system (13)of a cleaning system (1), which duct (38) is arranged at the inlet(40) and configured to provide an air flow path from the pipesystem (13) to the inlet (40); - an air valve (36) arranged at the duct (38) between the inlet(40) and the connection (35), which air valve (36) is arranged toselectively admit air into the duct (38); - a control unit (34) operatively connected to the air valve (36)and configured to control the air valve (36), and - at least one temperature sensor (32, 33) for sensing thetemperature of air flowing through the compressor suction pump(30) and which temperature sensor (32, 33) is connected to thecontrol unit (34), wherein the control unit (34) is configured toselectively open the air valve (36) in response to thetemperature sensed by the at least one temperature sensor (32,33).
    [2] 2. The vacuum unit (11) of claim 1, wherein at least one ofthe at least one temperature sensor (32, 33) is configured tomeasure the temperature of the air flowing through the outlet(50) of the compressor suction pump (30), wherein the controlunit (34) is configured to open the air valve (36) based on thetemperature of the air flow at the outlet (51).
    [3] 3. The vacuum unit (11) according to claim 1 or 2, whereinthe control unit (34) is configured to open the air valve (36) inresponse to the temperature exceeding a first threshold.
    [4] 4. The vacuum unit (11) according to claim 3, wherein thecontrol unit (34) is configured to close the air valve (36) inresponse to the temperature falling below a second threshold,which second threshold is lower than the first threshold. 21
    [5] 5. The vacuum unit according to any of claims 1 to 4, whereinthe Compressor suction pump (30) is selected from any of: - a rotary lobe compressor, - a screw compressor, and - a displacement blower.
    [6] 6. The vacuum unit according to claim 5, wherein thecompressor suction pump (30) is a rotary lobe compressor.
    [7] 7. The vacuum unit (11) according to any of claims 1 to 6,wherein at least one of the at least one temperature sensor (32,33) is configured to measure the temperature of the air flowingthrough the in|et (40) of the compressor suction pump (30),wherein the control unit (34) is configured to open the air valve(36) in response to the temperature at the in|et (40) exceeding athird threshold.
    [8] 8. The vacuum unit (11) according to claim 7, wherein thecontrol unit (34) is configured to close the air valve (36) inresponse to the temperature at the in|et falling below a fourththreshold, which fourth threshold is lower than the thirdthreshold.
    [9] 9. The vacuum unit (11) according to any of claims 1 to 8,wherein the control unit (34) is configured to stop the suctionpump (30) when the temperature reaches a maximum allowedtemperature threshold.
    [10] 10. The vacuum unit (11) according to any of claims 1 to 9,wherein the vacuum unit (11) comprises at least one vacuumrelease valve (37).
    [11] 11. The vacuum unit (11) according to any of claims 1 to 10,wherein the control unit (34) is configured to control the vacuum 22 unit in a standby mode, wherein the air valve (36) is kept openduring idling of the Compressor suction pump (30).
    [12] 12. A vacuum cleaning system (1) for sucking and transferringhot dust and hot particles, which vacuum cleaning system (1)comprises - a vacuum unit (11) according to any of claims 1 to 10, - a filtering system (12), and - a pipe system (13) provided with a suction nozzle (14),wherein the pipe system (13) is connected to a suction sideconnection (35) of the duct (38) of the vacuum unit (11) andwherein the filter system (12) is arranged in an air flow pathbetween the suction nozzle (14) and the vacuum unit (11).
    [13] 13. A vacuum cleaning system (1) according to claim 12,wherein the vacuum unit (11) is arranged outdoors, the pipesystem extends into a building and the suction nozzle (14) isarranged for sucking in hot dust and hot particles inside thebuilding.
    [14] 14. A vacuum cleaning system (1) according to claim 12 or 13,wherein the filtering system (12) comprises a pre-separator(12a) and a filter unit (12b).
    [15] 15. A method of controlling a vacuum cleaning system (1),which vacuum cleaning system (1) comprises: - a vacuum unit (11) having an inlet (40), and an outlet (50), acontrol unit (34) and at least one temperature sensor (32, 33), - a pipe system (13) provided with a nozzle (14) for sucking indust and particles, - a filtering system (12) for separating dust and particles, - said pipe system (13) connecting the nozzle (14) to thevacuum unit (11), and wherein the filtering system (12) isarranged in an air flow direction between the nozzle (14) andvacuum unit (11), and wherein the vacuum unit (11) furthercomprises a duct (38) arranged at the inlet (40), which duct 23 connects the inlet (40) to the pipe system (13), and which duct(38) comprises an air valve (36), wherein said methodcomprises: - creating (102) a first air stream for sucking in and transferringdust and particles, which first air stream extends from the nozzle(14) to the vacuum unit (11), and is compressed by the vacuumunit (11), - sucking in dust and particles by means of the nozzle (14), - transferring the dust and particles by means of the first airstream through the pipe system, - measuring (104) the temperature of the air at the vacuum unit(11), and - selectively opening (106) the air valve (36) in response to thetemperature, such that a second air stream is provided from theair valve (36), which second air stream blends with the first airstream at the inlet (40) of the vacuum unit (11), so as to cool thefirst air stream.
    [16] 16. A method according to claim 15, wherein the measuring(104) of the temperature comprises measuring the temperatureat the outlet (50) of the vacuum unit.
    [17] 17. A method according to claim 15 or 16, wherein opening(106A) of the air valve (36) is performed when the temperature,e.g. at the outlet (50), exceeds a first threshold.
    [18] 18. A method according to claim 17, further comprising closing(106B) the air valve (36) when the measured temperature fallsbelow a second threshold, which second threshold is lower thanthe first threshold.
    [19] 19. A method according to any of claims 15 to 18, furtherincluding controlling the vacuum cleaning system (1) in astandby mode, which standby mode comprises idling thecompressor suction pump (30), and keeping the air valve (36)open.
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    同族专利:
    公开号 | 公开日
    WO2016166033A1|2016-10-20|
    SE541665C2|2019-11-19|
    EP3283769A1|2018-02-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP2644040B2|1989-05-02|1997-08-25|大晃機械工業株式会社|Operation method of vacuum pump|
    JPH11270484A|1998-03-24|1999-10-05|Taiko Kikai Industries Co Ltd|Screw rotor type wet vacuum pump|
    JP3673744B2|2001-09-27|2005-07-20|大晃機械工業株式会社|Vacuum pump|
    SE0202111D0|2002-07-05|2002-07-05|Delaval Holding Ab|An arrangement and a method for the treatment of a vacuum pump|CN110976419A|2019-11-24|2020-04-10|南京公汇科技有限公司|Automatic cleaning system of vacuum processor|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1550432A|SE541665C2|2015-04-13|2015-04-13|Vacuum cleaning system for hot dust and particles|SE1550432A| SE541665C2|2015-04-13|2015-04-13|Vacuum cleaning system for hot dust and particles|
    EP16715523.3A| EP3283769A1|2015-04-13|2016-04-08|Vacuum unit, cleaning system and method of controlling a cleaning system|
    PCT/EP2016/057796| WO2016166033A1|2015-04-13|2016-04-08|Vacuum unit, cleaning system and method of controlling a cleaning system|
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