• 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 sensor arrangement for measuring parameters in melt, in particular the temperature in metal or cryolite melt, with an upper part and with a lower part wherein a coaxially extending tube with an open tube is arranged at an immersion end of the lower part and wherein in the upper part a coaxially running open guide tube is placed movably which is set in motion by means of an elastic body with a pressure and which an opening of the guide tube and the open end of the tube of the lower part coaxially are applied.
    公开号:BE1020060A3
    申请号:E2011/0431
    申请日:2011-07-07
    公开日:2013-04-02
    发明作者:
    申请人:Heraeus Electro Nite Int；
    IPC主号:
    专利说明:

    Sensor arrangement for the measurement of parameters in melt
    The invention relates to a sensor arrangement for measuring parameters in melt, in particular for measuring the temperature and then in particular in metal or cryolite melt with a melting point of more than 500 ° C, with an upper part and with a lower part that can be detached from the upper. The metal melt can for example be a steel melt or an iron melt.
    Similar sensor arrangements are known from, inter alia, DE 44 33 685 C2. It is described there that a thermal element is arranged on a supporting body. That thermal element is inserted in a container where the cooling temperature of the melt is measured. Other sensor arrangements for measuring temperatures in melt are known, inter alia, from DE 103 31 124 B3, wherein glass fibers are used as sensor element. EP 1 034 419 B1 also describes a sensor arrangement that uses a thermal element just like in DE 44 33 685 C2. Another temperature sensor is known, for example, from JP 07 229 791 A. Here, a glass fiber is used for the measurement, which measures the radiation from the melt and forwards it to a measuring unit in which the temperature is determined in the known manner on the basis of the measured radiation.
    The object of this invention is to improve the available installations and to simplify their reliable operation even more.
    This assignment is fulfilled by the invention with the features of the independent claims. The advantageous further elaborations of the invention are described in the sub-claims. Because a submerged end of the lower part remote from the upper part is provided with a tube extending coaxially with respect to a longitudinal axis of the lower part, which tube is closed at its end remote from the upper part and is open at the other end, the upper part is arranged in a guide tube (in particular in the direction of the longitudinal axis) movable coaxially with respect to a longitudinal axis of the upper part extending on both sides in a guide sleeve, that the guide tube is provided by means of an elastic body with a the pressure acting in the direction of the lower portion is set in motion and connects to the lower portion and that an opening of the guide tube and the open end of the tube of the lower portion are coaxially disposed with respect to the longitudinal axis of the lower portion , are the measurement and the forwarding of the light radiation for the temperature (or other para meters such as the content of additives) that can be determined from the radiation of a melt is possible in a simple manner. In addition, an optical fiber placed, for example, in the guide tube of the upper part and the tube of the lower part can be used very simply for several measuring cycles.
    Namely, the optical fiber used preferably for guiding the light and resulting temperature or parameter determination is generally unwound from a roll and passed through the sensor arrangement to the end. The optical fiber consists of a core of glass (preferably quartz glass) surrounded by a metal jacket. The latter makes it possible to handle the glass in the first place and, for example, prevents the glass from accidentally breaking. To this end, the metal shell - which is usually made of steel - fits very closely with the core. Such optical fibers are easily available commercially. For the measurement, the optical fiber is passed through the sensor arrangement to the end of the tube of the lower portion, i.e., to its closed end. The sensor arrangement is immersed in the melt with its immersion end, with the submerged lower part in particular heating up to the same temperature as the melt. The radiation from the melt is recorded by the end of the optical fiber and transmitted for the measurement.
    For measurements in high-temperature melt - such as cryolite or steel melt - the end of the optical fiber that is exposed to the melt is damaged by the effects of the high temperature, so that it can usually only be used once for a reliable measurement used. Therefore, after the measurement, after the sensor arrangement has been pulled out of the melt, the lower part is separated from the upper part. The guide tube is thereby pushed out of the upper part by the pressure of the elastic body over a distance which is determined by the arrangement of the guide tube in the upper part and then in particular by the arrangement of mechanical stops. That distance can, for example, be 1 to 5 cm. The optical fiber, which was originally slid from the upper part to the end of the tube of the lower part, is thereby surrounded by the tube over the displacement distance of the guide tube and is thereby mechanically stabilized. The end of the optical fiber which still projects out of the guide tube can then be broken off in a simple manner, for example by lateral mechanical effects - i.e. by bending -. A new end of the optical fiber is then available for further measurement. For this purpose, a lower portion is placed on the upper portion, the optical fiber is passed through the sensor arrangement into the end of the tube of the lower portion and the measurement can be performed.
    The length of the end of the optical fiber to be broken down is essentially determined by the length of the tube of the lower part and the movement of the guide casing caused by pressure of the elastic body. So that no substantial distortion can occur at the breaking point of the optical fiber, the inner diameter of the guide tube is large enough on the one hand to allow the optical fiber to move easily in, but on the other hand not much larger than the outer diameter of the optical fiber, to prevent, as far as possible, the optical fiber from bending at the end of the guide tube and to thereby ensure that the diameter of the optical fiber, including the metal jacket at the breaking point, is essentially retained. In that regard, a difference between the two diameters of about 0.5 mm or even less than 0.5 mm proved suitable. The supply of the guide tube is, as already described, limited by the concrete construction of the upper part, so that the tube can be formed such that as little as possible of the optical fiber is broken down, so that as much costs as possible can be achieved. be saved.
    The sensor arrangement is preferably shaped such that the elastic body is formed as a coil spring which can be arranged concentrically about the longitudinal axis of the upper part. In this way the pressure is evenly distributed over the entire guide tube so that it cannot tilt or get stuck. For practical reasons, the end of the guide tube remote from the lower part is accommodated in a housing which surrounds the elastic element. As a result, damage to the movement mechanism from the outside can be effectively prevented. The closures on the front of the inside of the housing can determine the spring travel of the elastic body and therefore also the movement of the guide tube.
    It is advantageous for the elastic element to connect to a collar of the guide tube, preferably within the housing, so that a uniform pressure is exerted on the guide tube. This collar can simultaneously be formed as a surrounding thickening with a stop side remote from the elastic body, which stop is pressed against a stop surface of the housing of the upper part when the guide tube is in its extended position. The housing can therefore be built cylindrical around the longitudinal axis of the upper part, wherein the front facing the lower part is provided with an opening for the guide tube through which the optical fiber is guided and wherein the opposite front side of another opening for the optical fiber is provided.
    The upper part and the lower part are preferably connected to each other by means of one connecting part. It is useful here that at least one of the connecting portions of at least one groove and at least the other connecting portion is provided with at least one thickening, wherein a thickening of the one connecting portion and at least one groove of the other connecting portion engage each other. As a result, a kind of clip connection is possible, which are connected to each other by the pressure of both parts (lower and upper part) and can be released by the opposite tensile force. To this end, at least one of the connecting portions must be made of an elastic material.
    For practical reasons, one of the connecting parts is tubularly shaped at its end facing the other connecting part, the tube also being provided with several slots in the longitudinal direction, in order to guarantee the elasticity required for insertion and release. This tube comprises the other connecting part at the end that is turned towards it. This other connecting part, which is included in the tubular connecting part, can also be in the form of a tube.
    It is useful that the connecting portion disposed on the lower portion of the sensor arrangement is provided with an axially-symmetrical cone, the smaller diameter of which is arranged close to the open end of the tube of the lower portion. When connecting the upper part and the lower part to the end of the larger diameter cone, the end of the guide tube directed towards it, preferably also conically shaped, can engage, so that it is additionally centered and the displacement of the optical fiber is not impeded by steps or the like.
    For practical reasons, at least one slot and at least one thickening run around the longitudinal axes of the upper and lower portion, so that an additional axially-symmetrical guide and an even pressure are ensured and the upper portion and the lower portion do not tilt with respect to each other. This allows the conduction of the optical fiber to be improved.
    It is useful that at the end of the lower part remote from the upper part, a holder is provided with a melt-in opening, into which the closed end of the tube of the lower part protrudes. Melt for measuring the liquidus curve can be included in that holder. The container is closed at its end remote from the lower part and is provided with a lead-in opening, which can be arranged sideways or in the direction of the lower part. It may also be useful for the tube from the lower part to pass through the inlet opening of the container.
    The holder is preferably arranged concentrically around the tube of the lower part and is provided with a closed end at its end remote from the lower part. The end facing the lower portion of the sensor arrangement can be open. However, it is also possible to seal both ends and to provide a lateral opening in the shell surface of the vessel. For practical reasons, the holder is thermally disconnected from the lower part as well as possible. This can be carried out in the manner known to the person skilled in the art with the aid of separate intermediate pieces which are arranged around the longitudinal axis of the holder or the lower part and connect the holder to the lower part. The smaller the cross-sectional area of the spacers in total, the better the thermal decoupling.
    Furthermore, it is advantageous for the end of the upper part remote from the lower part to be attached to a support tube or a submerged lens, so that the sensor arrangement can be immersed in the melt in a simple manner and removed again. For this purpose, the known plug connections can be used, the contacts of which are adapted to the specific application, so that electrical and / or optical contacts can be provided in addition to a mechanical connection. In addition to optical signals, this can also be used to transmit electrical signals from thermal elements or electrochemical sensors, for example.
    To protect the end that is being immersed, a protective cap can be provided at that end in a known manner, which protects the closed end of the tube from the lower part and possibly the arrangement of the container during immersion in the melt against mechanical protects damage.
    In addition, according to the invention, there is an upper part which is provided for use in a sensor arrangement described above, as well as a lower part which is provided for use with such an upper part.
    The invention is explained in more detail below with reference to exemplary embodiments shown in the drawings. In the drawing:
    Figure 1 shows a summary view of the sensor arrangement attached to the immersion lance
    Figure 2 shows a section through the upper part and the lower part of the sensor arrangement, with both parts separated from each other
    Figure 3 shows the cross-section of the sensor arrangement
    Figure 4 shows the cross section of the sensor arrangement with the optical fiber retracted
    Figure 5 shows the sensor arrangement after separating the upper part from the lower part after the measurement and
    Figure 6 breaking the end of the optical fiber
    Figure 1 schematically shows an overview of the sensor arrangement according to the invention. The upper part 1 essentially consists of the contact block 2, which at the same time is connected at its end remote from the immersion end to the lance 4 via contact piece 3 and also comprises the housing, of which from the immersion end the guide tube 5 set in motion with spring tension is visible.
    Figure 2 shows a cross-section through the upper part 1 and the lower part 6. The optical fiber 7 protrudes from the lower part 1 at its upper end through the contact pieces. The optical fiber 7 is unwound from a roll and fed through the lance 4 into the lower part 6. The upper part 1 is largely formed as a kind of housing, which forms a hollow space for receiving a cut-off part of the optical fiber, which contains one end of the guide tube 5 and a coil spring 11.
    The housing 8 is formed of a steel casing which, on its upper front side 9, has a circumferential stop 10 for the upper end of the coil spring 11. The lower end of the coil spring 1 presses against a stop 12 of the guide tube 5, so that the guide tube 5, in the illustrated state of the arrangement, ie when the upper part 1 and the lower part 6 are not connected to each other, is in its extended position state. The sliding movement is thereby limited by the stop 12, which lies in the housing on the lower front side 13 of the housing. In the example shown, the lower front side 13 is represented by the upper boundary of the connecting part 14 of the upper part 1. A circumferential groove is provided in the connecting portion 14 at the opposite end.
    The lower part 6 is provided with a body 16 of ceramic. Tube 17 runs through body 16 and is closed at its immersion end 18. At the immersion end 18, the tube is surrounded by a sample holder 19, which is connected to the body through the intermediate piece 20. At its end that is remote from the immersion end, a connecting part 21 is placed on the lower part 6, which can be inserted at its tubular end 22 onto the connecting part 14 of the upper part 1. For this purpose, a circumferential thickening is provided on its inner side of the tubular end 22, which thrust engages the circumferential groove in the assembled state.
    The connecting part 21 is provided with a coaxial cone 24, the end with the smallest diameter of which connects to the open end of the tube 17 and with its larger end can receive the also conically shaped end of the guide tube 5. Tube 17 can be made of steel or copper or quartz glass; the holder 19 and the intermediate piece 20 can be made of steel. The holder 19 can have a volume of approximately 4 cc with a height of approximately 28 mm and an inner diameter of approximately 14 mm.
    Figure 3 shows the lower part 6 that is placed on the upper part 1, the end of the guide tube 5 facing the immersion end being pressed into the housing 8 of the upper part 1. The coil spring is thereby compressed. When the upper part 1 and the lower part 6 are collapsed, that is, when the coil spring 11 is compressed, the end of the optical fiber 7 which faces the immersion end of the sensor arrangement is pushed into the tube 17 by a few millimeters. For the measurement, the optical fiber 7 is pierced to the closed immersion end 18 of the tube 17. The fiber protrudes about 60 mm from the guide tube 5 of the upper part 1. The collapsed arrangement is shown in Figures 3 and 4, Figure 4 showing the optical fiber 7 pushed forward.
    With the arrangement shown in Figure 4, after immersion of the sensor arrangement in the melt, sampling takes place in the sample holder 19. The sensor arrangement is then withdrawn from the melt and the cooling curve can be determined with the aid of the optical fiber. During that process, the sensor arrangement can be made to vibrate via the lance 4 in the known manner. Of course, only the temperature of the melt can also be measured. A holder is not required for this. The radiation emitted by the melt is measured by the optical fiber and transmitted through a detector. The temperature is determined in the known manner on the basis of the radiation.
    In figures 5 and 6 the sensor arrangement according to the measurement is shown. The upper part 1 and the lower part 6 are separated from each other, so that the lower part 6 used in the measurement can be replaced by a new one. During the separation of the lower part 6 from the upper part 1, the pressure on the coil spring 11 falls away, so that the guide tube 5 is pressed out of the housing 8 by about 2 cm. The position of the optical fiber 7 does not change thereby, so that the end of the optical fiber 7 protruding from the guide tube 5 is shortened by the movement of the guide tube 5. Subsequently, the end of the optical fiber 7 protruding from the guide tube 5 and now shortened with the movement of the guide tube is manually broken by moving the end of the guide tube 5 back and forth.
    The broken end of the optical fiber 7 was at least partially damaged in its structure during the measurement, so that it is no longer usable for a further measurement. The feeding mechanism for the guide tube 5 limits the end of the optical fiber 7 to be broken off as much as possible, so that as little as possible of the intact part of the optical fiber is discarded.
    A new lower part 6 can then be put on the upper part and a new measurement can be carried out.
    权利要求:
    Claims (13)
    [1]
    Sensor arrangement for the measurement of parameters in melt, in particular for the measurement of the temperature and in particular in metal or cryolite melt with a melting point of more than 500 ° C, with an upper part and a removable part at the upper part fixed lower part, characterized in that a submerged end of the lower part remote from the upper part is provided with a tube extending coaxially with respect to its longitudinal axis of the lower part, which tube is closed at its end remote from the upper part and the other end is open, in the upper part a guide tube running coaxially with respect to a longitudinal axis of the upper part and open on both sides, the guide tube being provided by means of an elastic body with an in the direction of the lower the working pressure portion is set in motion and connects to the lower portion and that an opening of the guide tube and the open end of the tube of the lower part are arranged next to each other coaxially with respect to the longitudinal axis of the lower part.
    [2]
    Sensor arrangement according to claim 1, characterized in that the elastic body is formed as a coil spring, which is arranged concentrically around the longitudinal axis of the upper part.
    [3]
    3. Sensor arrangement as claimed in claim 1 or 2, characterized in that the end of the guide tube remote from the lower part is placed in a housing which comprises the elastic element.
    [4]
    Sensor arrangement according to at least one of claims 1 to 3, characterized in that the elastic element connects to a collar of the guide tube.
    [5]
    Sensor arrangement according to at least one of claims 1-4, characterized in that the upper part and the lower part are connected to each other with a connecting part.
    [6]
    Sensor arrangement according to claim 5, characterized in that at least one of the connecting parts has at least one groove and at least the other connecting part has at least one thickening, wherein at least one thickening of the one connecting part and at least one groove of the other connecting part in each other grab.
    [7]
    Sensor arrangement according to claim 6, characterized in that the at least one groove and the at least one thickening are arranged around the longitudinal axes of the upper part and the lower part.
    [8]
    Sensor arrangement according to at least one of claims 1-7, characterized in that an optical fiber is arranged in the guide tube of the upper part and the tube of the lower part.
    [9]
    Sensor arrangement according to at least one of claims 1 to 8, characterized in that a holder with a melt-in opening is arranged on the end of the lower part remote from the upper part, in which the closed end of the tube of the lower part.
    [10]
    Sensor arrangement according to claim 9, characterized in that the tube runs from the lower part through the inlet opening of the holder.
    [11]
    Sensor arrangement according to at least one of claims 1 to 10, characterized in that the end of the upper part remote from the lower part is attached to a support tube or a plunger lance.
    [12]
    12. Upper part for use in a sensor arrangement according to at least one of claims 1-11.
    [13]
    13. Lower part for use with an upper part according to claim 12.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102011012175|2011-02-23|
    DE102011012175A|DE102011012175A1|2011-02-23|2011-02-23|Sensor arrangement for measuring parameters in melts|
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