• 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:
    The invention relates to a system (10) for cooling an electrical device in a fiber web machine, comprising an electrical device (12), medium lines (16) for supplying medium to an insert object (14) in the fiber web machine and cooling means (22) for conducting the medium from the medium line (16) on or in the electrical device (12) for the purpose of cooling the same with the medium. The medium is circulating lubricating oil for the insert object (14) in the fiber web machine.
    公开号:AT13592U1
    申请号:TGM8042/2013U
    申请日:2013-02-12
    公开日:2014-04-15
    发明作者:Atte Autio
    申请人:Metso Paper Inc；
    IPC主号:
    专利说明:

    Austrian Patent Office AT13 592U1 2014-04-15
    Description: [0001] The subject of this invention is a system for cooling an electrical appliance in a fiber web machine, comprising an electrical appliance, medium conduits for supplying medium to a feed object in the fibrous web machine, and cooling means for conveying the medium from the medium conduit to and into the fibrous web machine electrical device for cooling the same with the medium comprises.
    It is well known that electrical devices are all the more likely to break or age, that is, become weaker, the higher the temperature they are generally used. Electrical equipment can be manufactured to handle higher temperatures. Such electrical devices are, for example, intended for military use electrical equipment and electronics that tolerate temperatures up to about 85 ° C in continuous use. The military electrical equipment, however, requires more expensive investment than ordinary electrical equipment, for example for motor vehicles, to be used at operating temperatures below 65 ° C.
    At several points of the fiber web machine, the process environment has a high temperature of up to about 100 ° C. Such a process environment is found, for example, in the dryer section of the fiber web machine inside the hood. When the web breaks, the temperature rises, especially in the vicinity of the drying cylinder, since then eliminates the cooling of the cylinder material web. The cylinder cools slowly, even when the steam supply is shut off. In such a case, the temperature next to the drying cylinder, for example, rises from 100 ° C to 130 ° C. Another example is the proximity of the impingement flow dryer where excess heat can accumulate. The temperature of, for example, the electrical equipment within the dryer section hood then increases to high levels.
    From the prior art ago from the patent Fl 118274 known to perform the cooling of the electrical device with compressed air. In this case, the electrical device to be cooled is an ultrasonic sensor which serves for determining the position of the fibrous web or the fabric in the transverse direction. However, an intensive use of compressed air for cooling increases the costs considerably, because the consumption of cooling energy adds up to a high value in the year, because in the dryer section of the fiber web machine more than 20 such places to be cooled can be present. In addition, the intensive use of the vortex tubes to be used for compressed air cooling requires an expert setting of the system.
    Object of this invention is to provide a better compared to the systems of the prior art system for cooling electrical equipment in a fiber web machine, with which the energy consumption during cooling can be reduced. The characterizing features of this invention are evident from claim 1.
    Surprisingly, the cooling of electrical equipment in the fiber web machine with the help of the flow of a warm medium can accomplish, because the circulating lubricating oil to be used in the bearing housings of the fiber web machine can be redirected by means of cooling means for cooling at least one electrical device. The warm oil flow is definitely cooler than its surroundings and its temperature can be regulated. In this way can be used for cooling the electrical device liquid medium, which has a much greater heat transfer capacity than gaseous medium. In addition, for cooling, the already existing largely circulation lubricating system can be used, so that the system can be realized without major changes to the fiber web machine.
    Preferably, the cooling means are adapted to lead the leading to an insert object in the fiber web machine, belonging to the medium line flow line in its entirety for cooling to the electrical device and from there back to the mission medium conducting medium. For example, the original for lubricating the bearings of 1/10 Austrian Patent Office AT13 592U1 2014-04-15
    Roll used circulating lubricating oil used for cooling electrical equipment. If the entire flow is passed through the electrical device, the system can be realized without the need for a tapping or control valves and other control devices. At the same time the flow remains unthrottled, so that losses are avoided.
    The cooling means preferably comprise connecting lines for conducting the circulating lubricating oil from the medium line to the electrical device and from there back into the medium line and a housing for isolating the electrical device. With the housing, the electrical device can be shielded against the hot process environment, which reduces the need for cooling.
    In general, as an application point of the invention in the fiber web machine, the interior of the hood of the dryer section, the vicinity of the Impallströmungstrockners, the hot calender or another corresponding point at which the ambient temperature is higher than the temperature of the circulating lubricating oil in question.
    In the housing serving for the elimination of moisture air flow can be brought into effect, which is derived from an opening in the housing from this. With the air flow moisture is removed from the interior of the housing and in this way the condensation of moisture on the surfaces of the housed in the housing cooled electrical device can be avoided or at least reduced.
    Preferably, the cooling means comprise at least one heat exchange element, in whose connection the electronics to be cooled is arranged. Often, the contact of the components with the heat exchange element ensures sufficient cooling.
    Further, the cooling means may comprise a Peltier element for transmitting heat from the electrical device to the circulating lubricating oil adapted to turn on when the temperature of the electrical device is substantially equal to the temperature of the circulating lubricating oil. With the help of the Peltier element, the cooling can be continued to a temperature lower than the temperature of the circulating lubricating oil. Finally, the temperature of the electrical device may be considerably lower than the temperature of the circulating lubricating oil.
    The Peltier element may have a power of 10 - 500 W, preferably 50 - 150 W. Even with low power consumption causes a significant reduction in the temperature of the electrical device below the temperature of the circulating lubricating oil.
    The electrical device may consist of an optical measuring unit, an ultrasonic measuring unit or a mechanical position measuring unit. The measuring units in particular contain slightly aging electronics, such as LEDs, whose cooling brings cost savings in the form of a longer service life.
    The circulation lubricating oil flow rate in the cooling means may be 0.1-10 l / min, preferably 1-3 l / min. Even with relatively small quantities of lubricants, electrical equipment can be sufficiently cooled.
    The circulating lubricating oil may consist of lubricating oil as it is used for the lubrication of the bearings belonging to the fiber web machine rollers. Thus, an existing and already existing recirculating lubrication system can be used if the system is to be installed in existing machines.
    More specifically, it is characteristic of the system according to the invention that circulating lubricating oil serves as a medium for an insert object in the fiber web machine.
    With the system according to the invention, the cooling of electrical equipment is achieved at significantly lower operating costs than with systems of the prior art. In addition, it is possible to intensify the cooling with a Peltier element, and the temperature of the element can be changed by controlling the current intensity of the Peltier element. [0019] In the following, the invention will be described in detail with reference to the accompanying drawings, in which some embodiments of the invention are shown. In the drawings: Fig. 1 shows the system according to the invention, installed in the dryer section of a fiber web machine; Fig. 2 shows the cooling of an electrical device of the system according to the invention in one
    Casing; the housing is shown in section; Fig. 3 is a principle drawing of the Peltier element.
    Fig. 1 shows an embodiment of the system according to the invention, in which with the system 10 an existing in the dryer section of the fiber web machine electrical device 12 is cooled. According to the example of FIG. 1, the electrical device 12 is located inside the hood (not shown in the drawing). In Fig. 1, the drying section is shown without stringing. The warm air under the hood heats the electrical device 12. In this example, the electrical device 12 consists of the observation unit of a web tear detector for monitoring the fibrous web. The observation unit monitors the fiber web from a short distance and triggers an alarm when the web breaks. In the dryer section of the fiber web machine, there are a plurality of insert objects 14 with circulation lubrication, such as here the bearings 48 of the rollers 46, which are lubricated and whose temperature is kept under control with the circulation lubrication. In the system 10 according to the invention, circulating lubricating oil is used for cooling the electrical device 12.
    Generally used in paper machines as well as in the example in Fig. 1 for lubricating the bearings 48 and maintaining the temperature on a suitable for lubrication value circulating lubricating oil, the bearings 48 from the circulation lubricating oil tank 34 with the pump 36 via the Distributor 38 and further via the medium lines 16 is supplied. Preferably, the flow can be regulated in each individual medium line. Heat energy from the bearings 48 passes to the lower temperature recirculating lubricating oil, which is returned to the recirculating lubricating oil tank 34. The recirculating lubricating oil tank is preferably located below the floor level 67 in the basement, where the recirculating lubricating oil is stored at a temperature substantially below the hood temperature. The circulating lubricating oil tank serving cooling purposes has a very large volume, for example, 30 m 3, so that the heat transferred from the insert object does not appreciably increase the temperature of the circulating lubricating oil in the circulation lubricating oil tank 34. In addition, the temperature of the tank can be regulated.
    In the application of the invention causes only one or two degrees increased temperature of the circulating lubricating oil no weakening of the cooling of the actual Einsatzobjekts, that is, for example, the camp. According to the invention, the circulating lubricating oil is conducted from the medium line 16 with the aid of the cooling means 22 to the electrical device 12, from where the oil passes again via the medium line 16 to the insert object 14 and back into the tank 34.
    1, a distributor 38 can be used in the circulation lubrication, which distributes the circulating lubricating oil flowing to the insert objects 14 on the flow lines 50. According to the invention, in particular the supply line 50 is guided in its entirety on the electrical device 12 to be cooled. In this way, taps in the medium line are avoided which cause flow losses and require additional control valves and flow dividing sensors. The return lines 52 can be routed directly to the recirculating lubricating oil tank 34. If required, the return lines can be routed through heat exchangers so that the heat from the insert objects can be used for heating purposes.
    Further, the cooling means 22 as shown in FIG. 1 connecting lines 28 and a housing 30 for the electrical device 12. The housing 30 preferably has an insulation with which the housing 30 surrounding the warm air is kept as separate as possible from the electrical equipment. For example, the observation unit is located near Wal zen or cylinders 46, so that the added length of the connecting lines is very small, that is preferably less than two meters. In this context, medium, connecting flow line and return lines to understand piping in which the medium, preferably circulating lubricating oil, flows. Preferably, at least the heat transfer element is made of material that allows the most intense heat transfer from the electrical device to the circulating lubricating oil.
    Fig. 2 shows the cooling of the electrical device 12 in the interior of the housing 30, which is shown in section. Fig. 2 is a principle drawing and the dimensional relationships shown may differ from the actual. In Fig. 2, the housing 30 and the electrical device are shown differently from Fig. 1 horizontally. As in FIG. 1, here too the electrical device 12 consists of an observation unit which contains LEDs 40, a sensor 41 for reflected light and its control unit 42. The aforementioned parts are mounted on support plates 44 and 44 ', which consist of good heat conducting material, for example aluminum. Below the carrier plate 44, a Peltier element 24 is preferably attached for additional cooling of the LEDs 40 and the sensor 41. The support plates 44 and 44 'may be separate from each other, since the LEDs 40 and the sensor 41 require more cooling than the control unit 42, and thus it is possible to cool the support plate 44' under the control unit 42 with the heat transfer element 47. These different solutions of the drawing can be used individually in different applications, that is only the Peltier element or only the heat transfer element. It is generally desirable to maintain the LEDs and sensors at a temperature of 45 ° C or below, while the controller can tolerate up to 75 ° C.
    If the cooling requirement is low, the cooling of the electrical device can be performed with the bare heat transfer element. If any electrical device requires a lower temperature than can be achieved with the mere heat transfer element, a Peltier element may be used in addition to this. The cooling can also be done alone with the Peltier element, ie without heat transfer element.
    In the housing 30, the circulating lubricating oil flow is passed through the connecting lines 28, which in turn are connected to the medium line 16. The connecting lines 28 may be joined to the underside of the Peltier element 24 and to the underside of the carrier plate 44 '. Preferably, the Peltier element 24 is secured between the carrier plate 44 and the connecting lines 28. In this way, the heat from the LEDs 40 and the sensor 41 via the support plate 44 using the Peltier element 24 is transferred to the flowing in the connecting line 28 circulating lubricating oil. Accordingly, heat from the control unit 42 via the support plate 44 'and the heat transfer element is transferred directly to the flowing in the connecting line 28 circulating lubricating oil. The circulating lubricating oil transports the heat away from the electrical device 12. In conjunction with the Peltier element 24, a heat pipe can also be used to transfer heat.
    According to Fig. 2, the electrical device 12 is surrounded by a housing 30 which is to protect the electrical device 12 from high temperatures of the surrounding space. For example, because of the extremely high air temperature (e.g., 100 ° C) and humidity (e.g., 97%) under the hood, the condensation of moisture on the surfaces to be cooled presents a problem. This problem can be avoided by causing in the housing 30 a low air flow of 0.1-5.0 m / s, preferably 0.5-1.0 m / s, which is discharged via the opening 45 of the housing to the outside becomes. In the embodiment described here, this opening 45 consists of the opening 45 formed for the LEDs and the sensor on the housing 30. This air flow can be supplied to the housing 30 via the inlet opening 74, wherein it can be sufficiently heated at the connecting lines. In this way, air is passed out of the housing 30, without the moisture absorbed by the air reaches the dew point and immediately upon leaving the housing 30 through the opening to a disturbing the observation nebula. The air flow can be generated, for example, with a small fan or the like, by pneumatics or by gravity. In this context, no means of generating the air stream are shown here.
    The Peltier element 24 serves in this embodiment for cooling the LEDs 40 and the sensor 41 to a temperature which is lower than the temperature of the circulating lubricating oil. The temperature of the circulating lubricating oil may be, for example, 60 ° C, so that with direct cooling as in the control unit 42, a lower temperature of the electrical device can not be achieved when the temperature difference goes to zero. When using a Peltier element, a heat transfer can be achieved by means of electric current, wherein heat can be transferred from a colder object to a warmer object. In this example here, this means that the LEDs 40 and the sensor 41 can be cooled to a value below the recirculating lubricating oil temperature of 60 ° C, for example to 40 ° C. This makes it possible to use (even) more advantageous components in the LEDs and sensors, because the temperature of the electrical device can now be kept at a low level under all conditions. The Peltier element 24 is only used when the temperature of the electrical device is to be lowered to a value below the temperature of the circulating lubricating oil.
    Preferably, the system comprises control means, with which the power supply of the Peltier element 24 is turned on when the temperature of the electrical device is substantially equal to the temperature of the circulating lubricating oil. By "substantially" here is meant a temperature difference in which the heat transfer from the electrical device to the circulating lubricating oil takes place only extremely slowly. The temperature difference may be, for example, 1 -10 ° C, preferably 2-6 ° C.
    In Fig. 2, only one of the possible embodiments of the system according to the invention is shown, and it is understood that the placement of the parts can vary considerably depending on the application object. The system according to the invention can also be realized without a Peltier element. But it can also be used a multi-level Peltier element, which then gives a larger temperature difference. It is also possible to control the cooling power by means of current control.
    Fig. 3 shows a schematic drawing of the Peltier element 24 in a partially sectioned form. The Peltier element 24 may comprise two separate ceramic plates 60 and 62, between which there is a temperature difference. The ceramic plates 60 and 62 are fixed to each other by semiconductors 65. Between the semiconductors 65 and the ceramic plates 60, 62, an adhesive surface 72, for example silicone grease, can be arranged. The semiconductors 65 are separate parts that may be arranged in rows and columns. There are two types of semiconductors 65: p-type semiconductor 70 and n-type semiconductor 68. Electric current is supplied into the ceramic plates 60 and 62; one of the plates 60 serves as a negative pole 64, the other plate 62 as the positive pole 66 of the circuit. The juxtaposed semiconductors 65 are connected in series so that the current in the semiconductors 65 flows alternately from one n-type semiconductor 68 to one p-type semiconductor 70 and from one ceramic plate 60 and 62 to another.
    For example, the current flows in the circuit from the negative pole 64 in the voltage applied to the surface to be cooled ceramic plate 60 and along the attached n-type semiconductor 68 in the heat-receiving surface on the ceramic plate 62. From there the current continues to flow to the p-type semiconductor 70 connected in series with the n-type semiconductor 68, which conducts the current back to the ceramic plate 60 adjacent to the surface to be cooled. In this way, the current alternately flows between the ceramic plate 60 abutting against the surface to be cooled and the ceramic plate 62 abutting the heat receiving surface. The n-type semiconductors 68 carry heat in the current direction, the p-type semiconductors 70 in turn in the opposite direction. In this way, the heat migrates from the surface to be cooled to the heat-receiving surface.
    Depending on the object of use, the Peltier element 24 can have a power of 10 to 500 W, preferably 50 to 150 W. The Peltier element 24 can be single-stage or multi-stage, that is to say it can have a plurality of ceramic plate levels and semiconductor layers located one above the other. With the multi-stage element, a higher cooling capacity is achieved. 5/10 Austrian Patent Office AT13 592U1 2014-04-15 tion. For example, with one level of electrical equipment, a temperature drop of 30 ° C can be achieved. The rules can be easily done with direct current.
    The system according to the invention can be used for cooling electrical equipment in mission objects, in which a liquid circulating lubricant, preferably oil, is available. Alternatively, water can be used as the cooling medium, but then a separate thermal control unit is required. A particularly favorable use object in the dryer section of the fiber web machine is the cooling of the observation units used to display web breaks on bare rolls or cylinders. Blanke rolls heat up quickly when web breaks, increasing the need for cooling the electrical equipment.
    The system according to the invention can also be installed in existing paper machines by making small changes to the medium lines. In the present application, fibrous web machine is to be understood as meaning a paper, board or tissue machine or a pulp drying machine.
    As an electrical device to be cooled is any electrical device exposed to high ambient temperature, preferably an electrical device for optical measurement, ultrasonic measurement or mechanical position measurement in question. Electric motors, for example, can also be cooled in this way.
    According to one embodiment, a plurality of juxtaposed electrical equipment to be cooled can be connected to the feed stream leading to an insert object, provided that the temperature rise of the circulating lubricating oil remains moderate. The circulation lubricating oil flow rate in the cooling means may be, for example, 0.1-10 l / min, preferably 1-3 l / min, but is highly dependent on the object of use. 6.10
    权利要求:
    Claims (10)
    [1]
    Austrian Patent Office AT13 592U1 2014-04-15 Claims 1. System (10) for cooling an electrical device in a fiber web-type machine (10), comprising an electrical device (12), medium lines (16) for supplying medium to an insert object ( 14) in the fiber web machine and cooling means (22) for conveying the medium from the medium line (16) to the electrical device (12) for cooling the same with the medium, characterized in that the medium circulating lubricating oil for the insert object (14 ) in the fiber web machine.
    [2]
    2. System according to claim 1, characterized in that the to the use object (14) in the fiber web machine leading medium line associated flow line (50) for cooling the electrical device (12) in its entirety to the electrical device (12) and of since back to the use object (14) in the fiber web machine leading medium line (16) is guided.
    [3]
    3. System according to claim 1 or 2, characterized in that the cooling means (22) connecting lines (28) for conducting circulating lubricating oil from the medium line (16) in or on the electrical device (12) and back into the medium line (16) and a housing (30) for insulating the electrical device (12).
    [4]
    4. System according to claim 3, characterized in that for the removal of moisture in the interior of the housing (30) an air flow is brought to effect, which is discharged via an opening (45) in the housing (30) to the outside.
    [5]
    A system according to any one of claims 1 to 4, characterized in that the cooling means (22) comprise at least one Peltier element (24) serving to transfer heat from the electrical appliance (12) to the circulating lubricating oil, which is arranged to: to turn on when the temperature of the electrical appliance (12) is substantially equal to the temperature of the circulating lubricating oil.
    [6]
    6. System according to claim 5, characterized in that the Peltier element (24) is adapted to cool only a part of the electrical device (12).
    [7]
    7. System according to claim 5 or 6, characterized in that the Peltier element (24) has a power of 10 - 500 W, preferably 50-150 W.
    [8]
    8. System according to one of claims 1 to 7, characterized in that the electrical device (12) is an optical measuring unit, an ultrasonic measuring unit or a mechanical position measuring unit.
    [9]
    9. System according to one of claims 1 to 8, characterized in that the circulation lubricating oil flow rate in the cooling means (22) 0.1-10 l / min, preferably 1 - 3 l / min, is.
    [10]
    10. System according to any one of claims 1 to 9, characterized in that the circulating lubricating oil for lubricating the bearing (48) of the fiber web machine belonging to rolls (46) is to be inserted circulating lubricating oil. 3 sheets of drawings 7/10
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    同族专利:
    公开号 | 公开日
    FI20125162A|2013-08-15|
    FI126286B|2016-09-15|
    CN203256539U|2013-10-30|
    DE102013202237A1|2013-08-14|
    DE202013003323U1|2013-04-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE10035578A1|2000-07-21|2002-01-31|Voith Paper Patent Gmbh|Drive unit is for rotating paper and board machine parts|
    FI118274B|2004-02-05|2007-09-14|Metso Paper Inc|Method and apparatus for determining the lateral position of the edge of a web or tissue in a sheet forming machine|
    EP2143841A2|2008-07-07|2010-01-13|Voith Patent GmbH|Cooling system|
    DE118274C|DE102015218048B4|2015-09-21|2018-01-04|Voith Patent Gmbh|measuring unit|
    DE102015223533A1|2015-11-27|2016-12-29|Voith Patent Gmbh|Measuring device with water cooling|
    DE102015223525A1|2015-11-27|2016-11-03|Voith Patent Gmbh|measuring device|
    DE102018122341A1|2018-09-13|2020-03-19|Voith Patent Gmbh|Component of a machine for producing and / or treating a fibrous web|
    法律状态:
    2019-10-15| MM01| Lapse because of not paying annual fees|Effective date: 20190228 |
    优先权:
    申请号 | 申请日 | 专利标题
    FI20125162A|FI126286B|2012-02-14|2012-02-14|System for cooling an electrical apparatus in a fiber web machine|
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