• 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 leading tip of an eddy current testing probe (1) is connected to a feed tube (6) via elastic tube sections (3a - 3m) with a plurality of coils (4a - 4h) inserted in between. Said feed tube (6) can be pushed into a tube in the bundle to be tested by means of a feed device. The pressure-contact surfaces (9) of the coils (4a - 4h) each extend over only a section of the internal circumference of the tube and the coils (4a - 4h) are offset with respect to one another at the circumference of the testing probe (1) and in the longitudinal axis of the probe. A position-detection unit (25) is fitted in the testing probe (1). The apparatus according to the invention can be used to test even those tubes which have a narrow radius of curvature, flaws being located by a length and angle indication. …<IMAGE>…
    公开号:SU1722252A3
    申请号:SU894613950
    申请日:1989-04-25
    公开日:1992-03-23
    发明作者:Аданс Хельмар；Бегеляйн Георг；Якоб Хайнц
    申请人:Сименс Аг (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to airflow flaw detection and can be used to control tubes of a heat exchanger with U-shaped tubes.
    A device for eddy current testing of heat exchanger tubes with U-shaped tubes is known, in which the test probe is made with ring coils installed in two parallel planes across the pipe axis and pressed into the coil body. On the one hand, the test probe is connected to an extension hose through a flexible sleeve carrying a guide element, and on the other hand through a sleeve carrying a guide element to an insertion tip, Flexible sleeves have greater flexibility than an extension sleeve through which : device test probe can be inserted into the tube tube U-shaped tube. In this case, both coil axes are located coaxially with the longitudinal axis of the test probe and two defects can be identified in the rectilinear and curved part of the pipe under test, but it is impossible to determine the exact position around the pipe circumference
    A device for eddy current testing tubes is known, the probe of which has a plurality of axial elastic plastic hollow tubes that form the circumference of the flaw detector. On each strip is strengthened, eddy-current coil.
    When extending through the coils, the entire inner surface of the pipe under test is touched. However, the device is only suitable for checking straight pipes. The location of the defect is indicated only by the longitudinal dimension so that from this one can only conclude at what height of the pipe the defect is located.
    The closest in technical essence is a device for eddy current testing of heat exchanger tubes with U-shaped tubes, containing a test probe consisting of elements interconnected by a flexible coupling and comprising at least three sections,. located along a common axis, each of which is made in the form of a housing in which a coil holder with an inductor mounted on it is installed, an extension hose, elastic hoses connecting the probe elements to each other and with an extension hose, as well as a signal processing unit sections are displaced one relative to another in a circle.
    A disadvantage of the known device is that when inspecting the pipe (especially
    its curved part) coil unevenly adjacent to the inner wall of the pipe. In practice, the internal diameters in bent as well as in straight pipes are not
    exactly equal. Therefore, the coils do not fit with sufficient reliability around the inner perimeter, which leads to a decrease in the accuracy of control.
    The aim of the invention is to improve the accuracy of control,
    A device for eddy current testing of heat exchanger tubes with U-shaped tubes, containing a test probe consisting of elements interconnected between themselves by a flexible connection; and includes at least three sections located along a common axis, each of which is made in the form of a housing in which a coil of inductance attached to it is installed, an extension hose, elastic hoses connecting the probe elements to each other and with the extension hose, and signal processing unit, with coils inductance
    5 sections are displaced relative to each other around the circumference, provided with springs according to the number of inductors, and in the section housings there are grooves perpendicular to the axis of the probe, in which tubular holders are placed, which by means of springs are damped relative to the axis of the probe.-.
    The slots in the walls of the grooves are perpendicular to the axis of the probe, and the coils 5 have pins that are parallel to the axis of the probe and interact with the slots; In the slots of the sections there are two coil holders each with coils inductance oriented on them
    0 diametrically opposed to one another. In addition, the device has four sections, the grooves of the sections are offset from one another by an angle of 45 °, and the length L of the working surface of the coil is in5R
    the efficiency is chosen from the condition where
    R is the outer radius of the section body.
    In addition, the device is equipped with printed circuit boards for the number of sections, for-.
    0 mounted on the coil holders and connected to the terminals of the corresponding inductors. The probe elements have hollow cylindrical nozzles at the ends, and the hoses with their outer surface are connected to the inner surface of the nozzles by a threaded connection.
    One of the probe elements is a block for determining the position of defects and is made in the form of a hollow cylinder, the perimeter of which evenly distributes the contacts connected through resistances to the contacts of printed circuit boards, and also in the form of a contact element in the form of an electrically conducting ball fixed in the cavity of the cylinder on the tensioned cable along the probe and connected by electrical wires to the signal processing unit. The cable is made of two parts, one ends of which are connected by a cylindrical spring, and the other ends, respectively, with the first element of the probe and the node connecting the probe with the extension hose.
    Figure 1 shows a device for eddy current testing of heat exchanger tubes with U-shaped tubes, a longitudinal section; FIG. 2 is a section A-A in FIG. on fig.Z - section BB in figure 1; figure 4 is a section bb In figure 1; figure 5 is a section of GG in figure 1; 6 is a side view of the device for eddy current testing; Fig. 7 is an electrical circuit diagram of a unit for determining the location of a defect; FIG. 3 shows a contact diagram of a block, a location, a cross section; Fig. 9 is a distribution resistance circuit.
    A device for eddy current testing of heat exchanger tubes with U-shaped tubes (Figures 1 and 6) consists of a test probe 1 with an introductory tip 2, elastic hoses Z-3m, intermediate supports 4a-4e and coils 5a-5h connected to a connecting element 6, made in the form of a plug, which is pushed into the controlled pipe by means of the sliding block 7. Over-Zt hoses, the flexibility of which is greater than the flexibility of the extension sleeve 8, are installed in a controlled pipe by means of supports 4e-4d, having an annular shape.
    The clamping surfaces 9 (FIG. 2) of the coils 5a-5h in each case pass along a portion of the outer circumference (sector) of the probe 1. The coils 5a-5h are displaced one relative to the other around the circumference of the probe 1 at a predetermined angle a (FIGS. 2 and 3) and also along the longitudinal axis of the probe for a length a (Fig. 6) so that as the probe 1 advances along a test tube, each coil 5a-5h probes a given portion of the inner surface of the tube. The coils 5a-5h at the same time with their winding axes W are installed parallel to the axis of the probe and at least partially poured into the coil holders 10a, 10b. The coil blocks 1-Oa, 10b are movably mounted in the slots 11-14 of the housings 15a-15d vertical to the axis of the probe (FIGS. 2-5). In this case, the coil holders 10a, 10b have axial pins 16 and 17 (FIG. 1) installed parallel to the axis of the probe, which allow swinging
    vertical movement and mounted for this purpose with the possibility of movement in slots 18 and 19 in the walls of the grooves 11-14. Due to this, a good fit of the clamping surfaces of the 9 coils to the inner surface of the pipe and in the bends of the pipe is achieved. The coil holders 10a, 10b by the springs 20 in the grooves 11-14 are pressed outward (damped relative to the axis of the probe).
    In the device in each case, two spool holders 10a, 10b, respectively, with one coil in each spring, are installed in a groove. Thus, the probe 1 has four grooves 11-14 s displaced along the longitudinal axis of the probe, respectively, with two coil holders, for example 10a, 10b each, with the grooves 11-14 displaced one, relative to the other, by an angle a equal to 45 °, that the pressing surfaces 9 of the coils 5a-5h mutually overlap.
    The conductive ends 21 and 22 of the coils are connected to terminals 23 and 24 on the roller coil (figure 2). From there, the movable wires 5 and 26 go to electrical printed circuit boards 27, which inside the housings 15a-15d are fixed by pins 28 with slots 29. From each printed circuit board 27, two electrical cables 28 and 29 go to the channels in the coils and from there to the inside hoses ZA-3T (Fig. 1) and along the extension hose are passed in the terminal box 30 or to the connecting element 6 (Fig. 6) and from there through the extension hose 8 to the terminal box 30 connected to the signal processing unit 31.
    To determine the location of the defect in probe 1, a block 32 for determining the position of defects is provided. Block 32 (Fig.7-9) is formed from an electrical distribution circuit 33 resistances with several taps going to the contacts 34-41. Contacts 34-41 with the same spacing are located along the inner perimeter of a hollow cylinder placed in a detachable hollow additional support 4a with intermediately included insulating elements (Fig. 8). With contacts 34-41 distributed along the perimeter of the cylinder, the contact element 42 (Fig. 1) interacts in the form of an electrically conductive ball, mounted on a weight along the axis of the probe on a cable 43 tensioned in the probe 1. The cable 43 is on one side with a bracket 44 using a screw 45 mounted inside the inlet tip 2, conducted through additional supports 4a-4e and placed on the coil holders in the channels (FIGS. 2-5), and on the other hand mounted on the connecting element 5 for the extension arm ga 8 and from there stretched
    if necessary, through an extension sleeve to the terminal box 30 (figure 1). In order for the cable 43 to be constantly held in a tensioned state, a tension spring 46 is installed in one of the guiding elements Ac. Resistances 47-54 of the resistance distribution circuit 33 are also placed in the cavity of the additional support 4b. Distribution circuit 33 of resistances by electrical wires 55 and 56 and contact element 42 by electrical wire 57 is connected to signal processing unit 31, equipped with indicator and / or recording devices 58-60 (Fig. 6).
    In a recording device 58 having an oscillograph screen, the results of eddy current testing are presented graphically. The sliding block 7 is provided with a reference unit 61, from which electric wires are drawn to the indicator device 53, indicating the length of the probe extension in the pipe being tested.
    Wires 55-57 run through the internal volume of flexible hoses ZA-3, while on housings 15a-15d, wires 55-57, along with cables 28 and 29, are placed in channels 58 (Fig. 5). Electrical wires 55-56 are connected to a constant voltage source 59 (Fig. 7). The resistance distribution circuit 33 forms a voltage divider, on whose outlets certain voltages are set, having, for example, values of 2, 4, 6, 8. 10, 12, 14, 16 V. If the probe enters the rounding of the pipe being tested, the contact element 42 relates to one of pins 34-41. Since the coils 5a-5h are rigidly connected to the contacts 34-41, the position of the individual coils in the knee of the pipe under test is thereby fixed. The voltage applied between wires 56 and 57 is a measure for the angular position of the individual coils in the knee of the pipe being tested. The corresponding voltage value is recorded by the device 60, made in the form of a voltage recorder.
    Located between the additional supports 4a-4e and the housings 15a-15h, the elastic hoses Za-Zm are formed by elements of the hollow shaft, consisting mainly of a flexible wire helix with mutual radial adhesion of the spirals (Fig. 1). The additional supports 4a-4e and the housings 15-15d have a central through-hole, and at both ends there are nozzles with internal threaded turns for screwing in elements of the hollow shaft.
    0
    five
    0
    The accuracy of the registration of the angular position of the defect can be increased by the number of coils, if it is not enough to cover the inscribed 45 ° angle with four pairs of coils. If only minor requirements are placed on the determination of the location of the defect, then less than four pairs of coils can also be avoided, if necessary also with three coils offset by 120 °.
    权利要求:
    Claims (8)
    [1]
    1. A device for eddy current testing of heat exchanger tubes with U-shaped tubes, containing a test probe consisting of elements interconnected by a flexible link and including at least three sections along a common axis, each of which made in the form of a housing in which a coil-holder with an inductance coil mounted on it is installed,
    extension hose, elastic hoses connecting the probe elements to each other and with the extension hose, as well as signal processing unit 5, the section inductors being displaced relative to one another around the circumference, so that, in order to improve the accuracy of control, it is equipped springs according to the number of inductors, and in the case sections there are grooves perpendicular to the axis of the probe, in which the coil holders are placed, which by means of springs are damped relative to the axis of the probe.
    [2]
    2. The device according to claim 1, wherein the slots are perpendicular to the axis of the probe in the groove walls, and the coil holders have pins parallel to the axis of the probe and interacting with the slots.
    [3]
    3. The device according to paragraphs. 2, that is, with the fact that there are two coil holders in the slots of the sections, with inductance coils fixed on them, oriented diametrically opposite to each other.
    [4]
    4. The device according to claims 1 to 3, characterized in that it has four sections, the grooves of the sections are offset from each other by an angle of 45 °, and the length L of the working surface of the inductor is chosen from the condition
    R
    where R is the outer radius of the body
    0
    five
    0
    five
    0
    L
    2
    sections.
    [5]
    5 5. The device according to PP, 1-4, excluding the fact that it is equipped with printed circuit boards according to the number of sections attached to the coil holders and connected to the terminals of the respective inductors.
    [6]
    6. A device according to claims 1-5, characterized in that the probe elements have hollow cylindrical nozzles at the ends, and the hoses with their outer surface are connected to the inner surface of the nozzles by a threaded connection.
    [7]
    7. The device on PP, 1-6, about tl and ch yu e e e. the fact that one of the probe elements is a block for determining the position of defects and is made in the form of a hollow cylinder, the perimeter of which evenly distributes the contacts connected through resistances to the contacts of the print 0
    as well as in the form of a contact element in the form of an electrically conducting ball fixed in the cavity of the cylinder on a cable tensioned along the probe and connected by means of electrical wires to the signal processing unit.
    [8]
    8. The device according to claim 7, which is different from the fact that the cable is made of two parts, one ends of which are connected by a cylindrical spring and the other ends, respectively, with the first element of the probe and the node connecting the probe with an extension sleeve.
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    引用文献:
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    法律状态:
    优先权:
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    DE3820423|1988-06-15|
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