CN220730117U - High-precision eddy current sensor - Google Patents

Abstract

The utility model relates to the technical field of sensors and discloses a high-precision eddy current sensor which comprises a probe, an output cable and a cable connector, wherein an excitation coil and a processing circuit are arranged in a probe shell, a heat dissipation shell is arranged between the probe shell and the excitation coil, the excitation coil and the excitation coil are tightly attached, the processing circuit is arranged in a circuit shell, a liquid cavity is arranged between the processing circuit and the excitation coil, the processing circuit and the excitation coil are connected and transmitted through a receiving coil, a heater is arranged at the tail end of the processing circuit, the temperature of the probe is raised through the heater, so that the overall temperature is constant at a certain value, the measured metal deformation is certain, errors caused by temperature change of the probe are reduced, and compared with refrigeration and heat dissipation constant temperature, the high-precision eddy current sensor is easier to achieve and more energy-saving.

Description

High-precision eddy current sensor

Technical Field

The utility model relates to the technical field of sensors, in particular to a high-precision eddy current sensor.

Background

An eddy current sensor is a non-contact sensor for detecting changes in the surface of a metal conductor based on the eddy current effect that occurs when a conductor material is exposed to a changing magnetic field, which emits a high frequency alternating current magnetic field when the eddy current sensor is in proximity to the metal surface, which induces eddy currents in the metal when the metal surface is in proximity to the sensor.

To improve the accuracy of the eddy current sensor, the influence of temperature change on the deformation of metal is reduced, because heat is generated in the working process of the exciting coil, the metal is easy to deform when being heated, and meanwhile, the physical property is also influenced, so that the temperature is required to be set at a constant value, refrigeration and heat dissipation are required, the temperature is difficult to control, the energy consumption is large, errors are easy to cause, the temperature is increased, and the deformation caused by the current temperature is recorded to be measured more easily and accurately.

Disclosure of Invention

(one) solving the technical problems

Aiming at the defects of the prior art, the utility model provides a high-precision eddy current sensor which has the advantages of constant temperature measurement and higher precision and solves the problem of errors caused by temperature change.

(II) technical scheme

In order to achieve the purposes of constant temperature measurement and higher precision, the utility model provides the following technical scheme: the utility model provides a high accuracy electric vortex sensor, includes probe, output cable and cable joint, the probe includes probe casing, exciting coil, processing circuit and heater, be equipped with exciting coil and processing circuit in the probe casing, be equipped with the heat dissipation shell between probe casing and the exciting coil to the three closely laminates, processing circuit sets up in the circuit casing, is equipped with the liquid chamber with between the exciting coil, and processing circuit passes through receiving coil connection transmission with the exciting coil, processing circuit terminal department is equipped with the heater, and processing circuit passes through output cable connection with cable joint.

Preferably, the probe is cylindrical as a whole.

Preferably, even number of radiating fins which are symmetrically distributed are arranged on the radiating shell and penetrate out of holes in the probe shell, so that heat generated by the exciting coil can be radiated.

Preferably, the end of the probe shell is provided with two clamping nuts and adjusting threads for fixing the position and preventing shaking.

Preferably, the heater is specifically a microwave heater, and is disposed in the middle of the probe housing, so that the reflection of microwaves in the liquid cavity is symmetrical.

Preferably, the liquid filled in the liquid cavity is pure water, and the pure water is not a conductor, so that the whole circuit is ensured not to leak electricity.

Preferably, the circuit shell is made of polypropylene, so that the circuit shell has a good heat insulation effect and prevents the temperature from affecting the processing circuit.

Preferably, the probe housing is made of stainless steel, and provides electromagnetic shielding while having good strength.

(III) beneficial effects

Compared with the prior art, the utility model provides a high-precision eddy current sensor, which has the following beneficial effects:

1. this high accuracy current vortex sensor, through the use of heater, the heater is microwave heater, sends the microwave and heats the pure water in the liquid intracavity, can not lead to the fact the influence to whole circuit in, because set up in the middle to the heating of liquid intracavity pure water more even, adopts liquid to heat the probe is whole simultaneously, and the temperature maintains more stable, and the effect is better.

2. This high accuracy electric vortex sensor, through the use of fin and heater, the fin distributes away the heat that produces on the exciting coil for the heater is to the whole body temperature control more easily, uses through adjusting screw thread and clamping nut's cooperation, makes whole probe fixed more easily, and has the effect of anti-shake.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is a detailed view of the probe of the present utility model.

In the figure: 1. a probe; 2. an output cable; 3. a cable joint; 11. a probe housing; 12. an exciting coil; 121. a receiving coil; 13. a liquid chamber; 14. clamping a nut; 141. adjusting the screw thread; 15. a heater; 16. a processing circuit; 161. a circuit housing; 17. a heat dissipation shell; 171. a heat sink.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-2, a high-precision eddy current sensor comprises a probe 1, an output cable 2 and a cable joint 3, wherein the probe 1 comprises a probe shell 11, an exciting coil 12, a processing circuit 16 and a heater 15, the exciting coil 12 and the processing circuit 16 are arranged in the probe shell 11, a heat dissipation shell 17 is arranged between the probe shell 11 and the exciting coil 12, and the three are tightly attached;

the processing circuit 16 is disposed in the circuit housing 161, a liquid chamber 13 is disposed between the processing circuit 16 and the exciting coil 12, the processing circuit 16 and the exciting coil 12 are connected and transmitted through the receiving coil 121, a heater 15 is disposed at the end of the processing circuit 16, and the processing circuit 16 and the cable connector 3 are connected through the output cable 2.

Further, the circuit housing 161 is made of polypropylene, so that a good heat insulation effect is achieved, and the influence of temperature on the circuit is prevented.

The liquid chamber 13 is filled with pure water to ensure that the whole circuit cannot leak.

Further, the heater 15 is specifically a microwave heater, and is disposed in the middle of the probe housing 11, so as to ensure that the microwaves are reflected symmetrically in the liquid chamber 13.

Further, the heat dissipation shell 17 is provided with even number of symmetrically distributed heat dissipation fins 171, and penetrates out from the hole on the probe shell 11 to dissipate heat generated by the exciting coil 12, and the tail end of the probe shell 11 is provided with two clamping nuts 14 and adjusting threads 141 for fixing positions and preventing shaking.

The probe housing 11 is made of stainless steel, provides electromagnetic shielding while having good strength, and the whole probe 1 is cylindrical.

The working principle is that the whole probe 1 is fixed at a position to be measured through the cooperation of the clamping nut 14 and the adjusting screw thread 141, the exciting coil 12 is connected with a high-frequency alternating current power supply to generate an exciting signal, the eddy current in a target object is excited, the receiving coil 121 receives an induced magnetic field generated by the generated eddy current and transmits the induced magnetic field to the processing circuit 16, the induced magnetic field is transmitted through the output cable 2 and the cable connector 3, the heater 15 is a microwave heater, pure water in the liquid cavity 13 is heated through the heater 15, the whole probe 1 is kept at a constant temperature, heat generated by the exciting coil 12 is emitted through the radiating shell 17 and the radiating fin 171, the temperature is kept at a stable value, the deformation quantity caused by measured metal and the influence on physical characteristics are certain, the measured error can be effectively reduced, the probe shell 11 is made of stainless steel and has the advantages of being easier to control through heating constant temperature than refrigerating and radiating, the electromagnetic interference can be reduced by providing electromagnetic shielding and constant temperature at the same time.

To sum up, this high accuracy electric vortex sensor, through the use of heater 15, heater 15 is microwave heater, send the microwave and heat pure water in to liquid chamber 13, can not lead to the fact the whole circuit in the same time, because set up in the middle to liquid chamber 13 pure water heating more even, adopt liquid to heat probe 1 wholly simultaneously, the temperature maintains more stable, the effect is better, through the use of fin 171 and heater 15, the fin 171 gives off the heat that produces on the exciting coil 12, make heater 15 control more easily to whole temperature, use through adjusting screw thread 141 and clamping nut 14's cooperation, make whole probe 1 fix more easily, and have the effect of anti-shake.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. The utility model provides a high accuracy electric vortex sensor, includes probe (1), output cable (2) and cable joint (3), its characterized in that: the probe (1) comprises a probe shell (11), an exciting coil (12), a processing circuit (16) and a heater (15), wherein the exciting coil (12) and the processing circuit (16) are arranged in the probe shell (11), a heat dissipation shell (17) is arranged between the probe shell (11) and the exciting coil (12), and the three are tightly attached;

the processing circuit (16) is arranged in the circuit shell (161), a liquid cavity (13) is arranged between the processing circuit (16) and the exciting coil (12), the processing circuit (16) and the exciting coil (12) are connected and transmitted through the receiving coil (121), a heater (15) is arranged at the tail end of the processing circuit (16), and the processing circuit (16) and the cable connector (3) are connected through the output cable (2).

2. A high precision eddy current sensor as claimed in claim 1, wherein: the probe (1) is cylindrical as a whole.

3. A high precision eddy current sensor as claimed in claim 1, wherein: the heat dissipation shell (17) is provided with even number of symmetrically distributed heat dissipation fins (171) and penetrates out of holes in the probe shell (11).

4. A high precision eddy current sensor as claimed in claim 1, wherein: the tail end of the probe shell (11) is provided with two clamping nuts (14) and an adjusting thread (141).

5. A high precision eddy current sensor as claimed in claim 1, wherein: the heater (15) is specifically a microwave heater and is arranged in the middle of the probe shell (11).

6. A high precision eddy current sensor as claimed in claim 1, wherein: the liquid cavity (13) is filled with liquid which is pure water.

7. A high precision eddy current sensor as claimed in claim 1, wherein: the circuit housing (161) is made of polypropylene.

8. A high precision eddy current sensor as claimed in claim 1, wherein: the probe shell (11) is made of stainless steel.