Eddy current displacement sensor probe for high-temperature environment

Abstract

The utility model provides an eddy current displacement sensor probe for a high-temperature environment, which relates to the field of displacement sensors and comprises a probe body, an end head is mounted at one end of the probe body, and a cavity is arranged in the end head. A cavity of the end is internally provided with three supporting devices which are of an annular structure, the sizes of the three supporting devices are sequentially reduced, the three supporting devices are arranged in a sleeved mode, a first coil is wound on the supporting device on the outermost side, a second coil is wound on the supporting device in the middle, and a third coil is wound on the supporting device on the innermost side. According to the eddy current displacement sensor probe used in the high-temperature environment provided by the utility model, the heat dissipation holes are reserved between the graphite plate and the two adjacent supporting rods, so that the gas connectivity in the end cavity is enhanced, the heat dissipation effect of the coil I, the coil II and the coil III is facilitated, particularly the heat dissipation effect of the coil III on the innermost side is facilitated, and the heat dissipation effect of the coil I, the coil II and the coil III on the innermost side is improved through the graphite plate. And a heat dissipation effect can be achieved while high temperature resistance is achieved.

Description

Technical Field

[0001] The utility model relates to the field of displacement sensors, in particular to an eddy current displacement sensor probe for high-temperature environments. Background Art

[0002] An eddy current displacement sensor is a non-contact measuring device mainly used to detect the relative displacement change between a metal conductor and the sensor probe. Its working principle is based on the eddy current effect. There is an oscillation circuit inside the preamplifier of the eddy current displacement sensor, which can generate a high-frequency oscillating current. This current is transmitted through a connecting cable to the coil inside the probe. When the high-frequency current passes through the probe coil, a high-frequency alternating magnetic field will be generated around the probe. When the measured metal conductor approaches this alternating magnetic field, eddy currents (eddy currents) will be induced on the metal surface. This is caused by the principle of electromagnetic induction. The generated eddy currents will form a new alternating magnetic field, and the direction of this magnetic field is opposite to the direction of the original magnetic field generated by the probe coil, resulting in a change in the effective impedance of the probe coil. The change in the impedance of the probe coil is converted into a change in voltage or current, and through the voltage detection circuit and amplifier in the preamplifier for further processing, the magnitude of the output electrical signal is directly related to the distance from the probe to the surface of the measured metal. Therefore, the change in displacement can be determined by measuring this electrical signal.

[0003] The utility model with the publication number CN220398457U discloses a displacement sensor probe, including a displacement sensor body. A cable is arranged at the wiring end of the displacement sensor body. One end of the cable is provided with a probe body. Three control buttons are equidistantly arranged on the control end of the displacement sensor body. One end of the probe body is provided with a head. A cavity is arranged inside the head, and a first bobbin is arranged in the cavity inside the head. A second bobbin is sleeved inside the first bobbin, and a third bobbin is sleeved inside the second bobbin. Magnetic induction components are arranged on the circumferential walls of the first bobbin, the second bobbin, and the third bobbin. To a certain extent, this device can operate by enabling the coil with a diameter adapted to the side diameter of the measured object inside the probe body, so as to improve the monitoring sensitivity of the probe body and improve the accuracy of the displacement sensor body to monitor the displacement distance of the measured object through the probe body. However, since this device involves multiple coils and the coils are wound on a relatively closed bobbin, the heat dissipation performance is not good. Especially for the innermost coil, it is not convenient for heat dissipation.

[0004] Therefore, it is necessary to provide a new eddy current displacement sensor probe for high-temperature environments to solve the above technical problems. Summary of the Utility Model

[0005] To solve the above technical problems, the utility model provides an eddy current displacement sensor probe for high-temperature environments.

[0006] The eddy current displacement sensor probe for high-temperature environment provided by the utility model is installed on the eddy current displacement sensor and includes a probe body. One end of the probe body is installed with a head end. A cavity is arranged inside the head end, and three support devices in a ring structure with gradually decreasing sizes are arranged in the cavity of the head end. The three support devices are sleeved. A first coil is wound around the outermost support device, a second coil is wound around the middle support device, and a third coil is wound around the innermost support device.

[0007] The support device includes two support rings. One of the support rings close to the inner wall of the head end is fixedly connected to the inner wall of the cavity of the head end. A plurality of support rods arranged in an equidistant and annular arrangement are fixedly installed between the two support rings. Heat dissipation plates are arranged at the gaps of the plurality of support rods. Two ends of the heat dissipation plate are respectively fixedly connected to the two support rings, and heat dissipation holes are left between the heat dissipation plate and the adjacent two support rods.

[0008] Preferably, the heat dissipation plate is a graphite plate.

[0009] Preferably, the two ends of the first coil, the second coil, and the third coil are respectively electrically connected to the eddy current displacement sensor.

[0010] Preferably, a groove is formed on the side wall of the graphite plate away from the center of the head end, and a heat dissipation member is movably arranged in the groove of the graphite plate.

[0011] Preferably, the heat dissipation member includes a heat dissipation plate and a spring. The heat dissipation plate is movably arranged in the groove of the graphite plate. One end of the spring is fixedly connected to the bottom wall of the groove of the graphite plate, and the other end of the spring is fixedly connected to the side wall of the heat dissipation plate.

[0012] Preferably, the heat dissipation plate can be completely moved into the groove of the graphite plate.

[0013] Preferably, the heat dissipation plate is a graphite sheet.

[0014] Compared with the related technology, the eddy current displacement sensor probe for high-temperature environment provided by the utility model has the following beneficial effects:

[0015] 1. Since heat dissipation holes are left between the heat dissipation plate and the adjacent two support rods, the gas connectivity in the cavity of the head end is strengthened, which is convenient for the heat dissipation of the first coil, the second coil, and the third coil, especially for the heat dissipation of the innermost third coil, and is convenient for the long-term use of the device.

[0016] 2. The first coil, the second coil, and the third coil are respectively wound around the three support devices. After winding, due to the extrusion of the coils, the graphite sheet moves into the groove of the graphite plate. At this time, the spring is in a compressed state. Under the action of the spring, the graphite sheet is in close contact with the surface of the coil, strengthening the heat dissipation effect on the coil. Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of an eddy current displacement sensor probe for high-temperature environments provided by the present utility model;

[0018] Figure 2 It is Figure 1 a schematic structural diagram of a part of the structure shown;

[0019] Figure 3 It is Figure 1 a schematic cross-sectional structural diagram of a part of the structure shown;

[0020] Figure 4 It is Figure 2 a schematic structural diagram of the support device shown;

[0021] Figure 5 It is Figure 4 a schematic structural diagram of the heat dissipation plate and heat dissipation components shown;

[0022] Figure 6 It is Figure 5 a schematic cross-sectional structural diagram of the structure shown.

[0023] Reference numerals in the figures: 1, probe body; 2, end; 3, coil one; 4, coil two; 5, coil three; 6, support ring; 7, support rod; 8, heat dissipation plate; 9, heat dissipation holes; 10, graphite sheet; 11, spring. Detailed Embodiments

[0024] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0025] Please refer to Figures 1-6 , wherein, Figure 1 It is a schematic structural diagram of an eddy current displacement sensor probe for high-temperature environments provided by the present utility model; Figure 2 It is Figure 1 a schematic structural diagram of a part of the structure shown; Figure 3 It is Figure 1 a schematic cross-sectional structural diagram of a part of the structure shown; Figure 4 It is Figure 2 a schematic structural diagram of the support device shown; Figure 5 It is Figure 4 a schematic structural diagram of the heat dissipation plate and heat dissipation components shown; Figure 6 It is Figure 5 a schematic cross-sectional structural diagram of the structure shown.

[0026] In the specific implementation process, as Figures 1-6As shown, the probe is installed on an eddy current displacement sensor, including a probe body 1. One end of the probe body 1 is installed with a tip 2. A cavity is provided inside the tip 2. Inside the cavity of the tip 2, there are three support devices in a ring structure with gradually decreasing sizes. The three support devices are sleeved. A first coil 3 is wound around the outermost support device, a second coil 4 is wound around the middle support device, and a third coil 5 is wound around the innermost support device;

[0027] The support device includes two support rings 6. One of the support rings 6 close to the inner wall of the tip 2 is fixedly connected to the inner wall of the cavity of the tip 2. A plurality of support rods 7 arranged in an equidistant and annular manner are fixedly installed between the two support rings 6. Heat dissipation plates 8 are provided at the gaps between the plurality of support rods 7. Both ends of the heat dissipation plates 8 are respectively fixedly connected to the two support rings 6. Heat dissipation holes 9 are left between the heat dissipation plates 8 and the adjacent two support rods 7. The heat dissipation plates 8 are graphite plates. The two ends of the first coil 3, the second coil 4, and the third coil 5 are respectively electrically connected to the eddy current displacement sensor (not shown in the figure). Since heat dissipation holes 9 are left between the heat dissipation plates 8 and the adjacent two support rods 7, the gas connectivity inside the cavity of the tip 2 is enhanced, facilitating the heat dissipation effect of the first coil 3, the second coil 4, and the third coil 5, especially the heat dissipation of the innermost third coil 5. It should be noted that in order for this device to be used in a high-temperature environment, when manufacturing, high-temperature-resistant materials can be selected for the tip 2 and the spring 11;

[0028] A groove is provided on the side wall of the graphite plate away from the center of the tip 2, and a heat dissipation member is movably arranged in the groove of the graphite plate. The heat dissipation member includes a heat dissipation plate 8 and a spring 11. The heat dissipation plate 8 is movably arranged in the groove of the graphite plate. One end of the spring 11 is fixedly connected to the bottom wall of the groove of the graphite plate, and the other end of the spring 11 is fixedly connected to the side wall of the heat dissipation plate 8. The heat dissipation plate 8 can be completely moved into the groove of the graphite plate. The heat dissipation plate 8 is a graphite sheet 10. After the first coil 3, the second coil 4, and the third coil 5 are respectively wound around the three support devices, due to the extrusion of the coils, the graphite sheet 10 moves into the groove of the graphite plate. At this time, the spring 11 is in a compressed state. Under the action of the spring 11, the graphite sheet 10 is in close contact with the surface of the coil, enhancing the heat dissipation effect on the coil.

[0029] The working principle provided by the present utility model is as follows: When using this device, since there are heat dissipation holes 9 left between the graphite plate and the adjacent two support rods 7, the gas connectivity inside the cavity of the end 2 is strengthened, facilitating the heat dissipation effect of coil one 3, coil two 4, and coil three 5, especially the heat dissipation of the innermost coil three 5. Through the provided graphite plate, graphite is composed of carbon atoms, and these carbon atoms are arranged in a layered structure. The carbon atoms within each layer are connected by strong covalent bonds, forming a stable hexagonal lattice. This structure endows graphite with extremely high stability, enabling it to maintain the integrity of its structure even in high-temperature environments and not easily decompose. In addition, the density of the graphite material is relatively low, which means that in the same volume, compared with heavy metal materials, graphite products can provide less thermal mass resistance and are convenient for heat dissipation. In addition, when using this device, coil one 3, coil two 4, and coil three 5 are respectively wound around three support devices. After winding, due to the extrusion of the coils, the graphite sheet 10 moves into the groove of the graphite plate. At this time, the spring 11 is in a compressed state. Under the action of the spring 11, the graphite sheet 10 is in close contact with the surface of the coil, strengthening the heat dissipation effect on the coil.

[0030] The circuits and controls involved in the present utility model are all prior arts and will not be elaborated here too much.

[0031] The above are only the embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present utility model.

Claims

1. An eddy current displacement sensor probe for high temperature environment, the probe is installed on the eddy current displacement sensor, characterized in that: The invention comprises a probe body (1), one end of which is provided with a terminal (2), a cavity being provided in the terminal (2), and three supporting devices having an annular structure and decreasing in size being provided in the cavity of the terminal (2), the three supporting devices being arranged in a sleeve relationship, the outermost supporting device being wound with a coil one (3), the middle supporting device being wound with a coil two (4), and the innermost supporting device being wound with a coil three (5); the supporting device comprising two supporting rings (6), one of the supporting rings (6) close to the inner wall of the terminal (2) being fixedly connected to the inner wall of the cavity of the terminal (2), a plurality of supporting rods (7) being equidistantly distributed and arranged in an annular shape being fixedly installed between the two supporting rings (6), a heat dissipation plate (8) being provided at the gaps between the plurality of supporting rods (7), the two ends of the heat dissipation plate (8) being respectively fixedly connected to the two supporting rings (6), and a heat dissipation hole (9) being left between the heat dissipation plate (8) and two adjacent supporting rods (7).

2. The eddy current displacement sensor probe for high temperature environment according to claim 1, characterized in that: The heat dissipation plate (8) is a graphite plate.

3. The eddy current displacement sensor probe for high temperature environment according to claim 2, characterized in that: The two end connections of the coil 1 (3), the coil 2 (4) and the coil 3 (5) are electrically connected to the eddy current displacement sensor respectively.

4. The eddy current displacement sensor probe for high temperature environment according to claim 3, characterized in that: A groove is provided on the side wall of the graphite plate away from the center of the end head (2), and a heat sink is movably arranged in the groove of the graphite plate.

5. The eddy current displacement sensor probe for high temperature environment according to claim 4, characterized in that: The heat sink comprises a heat sink (8) and a spring (11); the heat sink (8) is movably disposed in a groove of the graphite plate; one end of the spring (11) is fixedly connected to the bottom wall of the groove of the graphite plate; and the other end of the spring (11) is fixedly connected to the side wall of the heat sink (8).

6. The eddy current displacement sensor probe for high temperature environment according to claim 5, characterized in that: The heat dissipation plate (8) can be completely moved into the groove of the graphite plate.

7. The eddy current displacement sensor probe for high temperature environment according to claim 6, characterized in that: The heat dissipation plate (8) is a graphite sheet (10).

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