A distance regulator and a method of regulating
By designing a distance adjuster that includes a base, a long-distance slide rail, a long-distance slider, a differential screwdriver, and a micro-distance slider, the problem of difficulty in adjusting the distance between the eddy current sensor probe and the rotor being measured is solved, achieving a fast, accurate, and stable adjustment effect, and it is applicable to low-temperature turbine expanders of different sizes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
- Filing Date
- 2023-03-13
- Publication Date
- 2026-05-12
AI Technical Summary
The distance between the existing eddy current sensor probe and the rotor being measured is difficult to adjust to a suitable state, resulting in high installation time and cost, as well as the risk of collision or exceeding the detection range.
A distance adjuster was designed, including a base, a long-distance slide rail, a long-distance slider, a differential screwdriver, and a micro-distance slider. Coarse adjustment is achieved by moving the long-distance slider, and fine adjustment is achieved by the differential screwdriver, ensuring that the distance between the eddy current sensor probe and the target being measured can be adjusted quickly, accurately, and stably.
It enables rapid, accurate, and stable adjustment of the distance between the eddy current sensor probe and the target being measured, avoiding the risk of collision, and is applicable to small cryogenic turbine expanders of different sizes, demonstrating wide versatility.
Smart Images
Figure CN116255533B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of distance adjustment technology, and in particular to a distance adjuster and method for adjusting the distance between an eddy current sensor and a target being measured. Background Technology
[0002] The small cryogenic turbine expander is a key component in large cryogenic refrigeration systems, enabling the creation of cryogenic environments. Its main principle is that the rotor system within the small cryogenic turbine expander rotates at high speed and stably within a gas bearing, driving the impeller to rotate at high speed. The refrigerant undergoes isentropic expansion within the rapidly rotating impeller. Therefore, the high-speed and stable rotation of the rotor system within the gas bearing is crucial for the small cryogenic turbine expander to achieve expansion and cooling. During the development of the small cryogenic turbine expander, it is essential to study the rotor dynamics characteristics exhibited by the rotor system within the gas bearing, such as shaft trajectory, vibration amplitude, rotational speed, double harmonic frequency, and low-frequency eddy current frequency.
[0003] In the measurement of rotor dynamic characteristics of a small cryogenic turbine expander, the eddy current sensor system used is a non-contact measurement system. The rotor is made of stainless steel. Based on the principle of electromagnetic induction, when an alternating current passes through the metal coil in the eddy current sensor probe, an alternating magnetic field is generated. When the rotor being measured is in the alternating magnetic field, a current is simultaneously generated within the rotor, and the current generated in the measured target exhibits a vortex pattern within the metal body. The magnitude of the generated eddy current is a function of parameters such as the geometric dimensions of the metal conductor, material properties, the frequency of the coil excitation current, and the distance between the coil and the surface of the metal body. During the rotor characteristic measurement of the small cryogenic turbine expander, the eddy current sensor probe operates in a non-contact state. At this time, the voltage value of the eddy current sensor exhibits a single linear function relationship with the measured distance. The characteristics of the eddy current sensor are high sensitivity, good dynamic performance, and ease of automatic data acquisition.
[0004] However, the rotor of a small cryogenic turbine expander rotates at high speed and stably within a gas bearing, with vibration amplitudes ranging from tens of micrometers. The micro-distance eddy current sensor used has a detection range of 0–500 micrometers, corresponding to a voltage amplitude of 0–10 mV. If the distance between the eddy current sensor and the target is too small, there is a risk of collision; if the distance is too large, it can easily exceed the detection range. Therefore, during the installation of the eddy current sensor probe, the problem of excessively large or small installation distances often arises, and adjusting the installation distance to a suitable state often requires significant time and effort. Currently, there is no equipment that can meet the requirements for adjusting the distance between the eddy current sensor probe and the rotor. Summary of the Invention
[0005] One objective of this invention is to provide a distance adjuster and method that can quickly, accurately, and stably adjust the distance between the eddy current sensor probe and the rotor under test, thereby solving the technical problem that the distance between the existing eddy current sensor probe and the rotor under test is difficult to adjust to a suitable state.
[0006] This invention provides a distance adjuster for adjusting the distance between an eddy current sensor and a target. The distance adjuster includes a base for mounting on the target and an adjustment module mounted on the base. The adjustment module includes a long-distance slide rail mounted on the base, a long-distance slider slidably disposed on the long-distance slide rail, a differential threader disposed on the long-distance slide rail, and a micro-distance slider slidably disposed on the long-distance slider. The micro-distance slider is used to mount the eddy current sensor probe, and the differential threader is connected to the micro-distance slider. The adjustment module achieves coarse adjustment of the distance between the eddy current sensor probe and the target by moving the long-distance slider relative to the long-distance slide rail, and achieves fine adjustment of the distance between the eddy current sensor probe and the target by moving the micro-distance slider relative to the long-distance slider through the differential threader.
[0007] In one embodiment of the present invention, the long-distance slider is provided with a slide rail facing inward, so that the micro slider can slide along the long-distance slider; the long-distance slider is also provided with a groove for mounting the probe of the differential screwdriver.
[0008] In one embodiment of the present invention, the gap between the long-distance slide rail and the long-distance slider is 20±1μm, and the gap between the micro-slider and the long-distance slider is 20±1μm.
[0009] In one embodiment of the present invention, the long-distance slide rail is provided with a U-shaped groove, the long-distance slider is provided at the front end of the long-distance slide rail, and the differential threader is provided at the rear end of the long-distance slide rail and is partially located in the U-shaped groove.
[0010] In one embodiment of the present invention, the micro slider is a semi-circular structure; the micro slider has a first mounting hole for mounting an eddy current sensor probe and a second mounting hole for mounting a probe of the differential threader; the adjustment module further includes a retaining ring for fixing the probe of the differential threader and the micro slider.
[0011] In one embodiment of the present invention, the base is an annular structure with a plurality of mounting holes spaced apart, and the long-distance slide rail is mounted on the base by bolts.
[0012] In one embodiment of the present invention, a first fixing member is provided on each side of the long-distance slider, and the first fixing member is used to lock the position of the long-distance slider when the long-distance slider slides to the target position; the differential threader is fixed on the long-distance slider by a second fixing member; a third fixing member is provided on the micro slider, and the third fixing member is used to lock the position of the micro slider when the micro slider moves to the target position; the adjustment module further includes two fourth fixing members for fixing the eddy current sensor probe on the micro slider.
[0013] In one embodiment of the present invention, the first fixing member, the second fixing member and the third fixing member are bolts or screws, and the fourth fixing member is a nut.
[0014] In one embodiment of the present invention, there are two adjustment modules, which are orthogonally mounted on the base, and the target to be measured is the rotor of a turbine expander.
[0015] In another aspect, the present invention also provides an adjustment method for the distance adjuster, used to adjust the distance between the eddy current sensor and the target being measured, comprising the following steps:
[0016] Install the adjustment module on the base to obtain the distance adjuster;
[0017] Install the distance adjuster on the target being measured;
[0018] The long-distance slider of the sliding adjustment module allows the eddy current sensor probe mounted on the long-distance slider to approach the target being measured.
[0019] The position of the long-distance slider is fixed by the first fixing component;
[0020] The rotating differential threader causes the probe of the differential threader to push the micro slider along the long slider, thereby driving the micro movement of the eddy current sensor probe.
[0021] The position of the micro slider is fixed by the third fixing component when the eddy current sensor probe is moved to the target distance.
[0022] The main objective of this invention is to design a distance adjuster for adjusting the distance between the probe of an eddy current sensor and the target being measured. The first step is to adjust the long-distance slider to achieve coarse adjustment of the distance between the eddy current sensor probe and the target being measured. The second step is to adjust the differential screw to achieve fine adjustment of the distance between the eddy current sensor and the target being measured. Thus, through the two processes of coarse adjustment and fine adjustment, the distance between the eddy current sensor probe and the target being measured can be quickly and accurately adjusted to a suitable state to meet the distance adjustment requirements between the eddy current sensor and the rotor of the turbine expander.
[0023] The distance adjuster of the present invention has the advantages of easy disassembly and assembly, fast, accurate and stable adjustment. Moreover, the distance adjuster can be adapted to small low temperature turbine expanders of different sizes by changing the base of different sizes, and has the characteristics of wide versatility.
[0024] The further objects and advantages of the invention will become fully apparent from the following description and accompanying drawings. Attached Figure Description
[0025] Figure 1 This is a top view schematic diagram of the distance adjuster according to a preferred embodiment of the present invention.
[0026] Figure 2 for Figure 1 The diagram shows a three-dimensional structural schematic of the adjustment module of the distance adjuster.
[0027] Figure 3 for Figure 2 The diagram shows a top view of the adjustment module.
[0028] Figure 4 for Figure 1 The diagram shown illustrates the distance adjuster installed on a small turbine expander.
[0029] Explanation of icon numbers:
[0030] Distance adjuster 100; base 10; mounting hole 11; adjustment module 20; long-distance slide rail 21; U-shaped groove 211; long-distance slider 22; slide groove 221; differential threader 23; micro-distance slider 24; snap ring 25; first fixing part 26; second fixing part 27; third fixing part 28; fourth fixing part 29; eddy current sensor probe 30; turbine expander 40; rotor 41. Detailed Implementation
[0031] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.
[0032] Those skilled in the art should understand that, in the disclosure of this invention, the terms "vertical," "horizontal," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.
[0033] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.
[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0035] This invention aims to provide a distance adjuster 100 that can quickly and accurately adjust the distance between the eddy current sensor probe 30 and the rotor 41 under test during the measurement of the dynamic characteristics of a small cryogenic turbine expander rotor system. Figures 1 to 4 As shown, the specific structure and adjustment method of the distance adjuster 100 will be specifically described below, taking the application of the distance adjuster 100 in quickly adjusting the distance between the eddy current sensor probe 30 and the rotor 41 under test as an example.
[0036] Specifically, such as Figure 1 As shown, the distance adjuster 100 includes a base 10 for mounting on the target and an adjustment module 20 mounted on the base 10. The adjustment module 20 includes a long-distance slide rail 21 mounted on the base 10, a long-distance slider 22 slidably mounted on the long-distance slide rail 21, a differential threader 23 mounted on the long-distance slide rail 21, and a micro slider 24 slidably mounted on the long-distance slider 22. The micro slider 24 is used to mount an eddy current sensor probe 30, and the differential threader 23 is connected to the micro slider 24.
[0037] Specifically, the adjustment module 20 achieves coarse adjustment of the distance between the eddy current sensor probe 30 and the target being measured by moving the long-distance slider 22 relative to the long-distance slide rail 21, and achieves fine adjustment of the distance between the eddy current sensor probe 30 and the target being measured by moving the micro-distance slider 24 relative to the long-distance slider 22 through the differential screwdriver 23.
[0038] It is understood that the first step of this invention can achieve coarse adjustment of the distance between the eddy current sensor probe 30 and the target by adjusting the long-distance slider 22, and the second step can achieve fine adjustment of the distance between the eddy current sensor and the target by adjusting the differential screw 23. In this way, through the two processes of coarse adjustment and fine adjustment, the distance between the eddy current sensor probe 30 and the target can be quickly and accurately adjusted to a suitable state to meet the distance adjustment requirements between the eddy current sensor and the rotor 41 of the turbine expander 40.
[0039] It is worth mentioning that, such as Figure 1 As shown, the base 10 is an annular structure with a plurality of mounting holes 11 spaced apart, so that the distance adjuster 100 can be fitted onto the rotor 41 of the turbine expander 40; the long-distance slide rail 21 is mounted on the base 10 by bolts.
[0040] It should be understood that the base 10 can be configured into other shapes depending on the target being measured, and the present invention does not limit this.
[0041] It is understood that the distance adjuster 100 of the present invention may include one or more of the adjustment modules 20. In this specific embodiment, there are two adjustment modules 20, which are orthogonally mounted on the base 10. The target to be measured is the rotor 41 of the turbine expander 40.
[0042] In the measurement of the rotor dynamic characteristics of a small cryogenic turbine expander, the measurement principle is that the eddy current sensor measures the vibration signal of the rotor. A single eddy current sensor performs a Fourier transform on the rotor vibration signal, which can analyze the rotor's vibration frequency, vibration amplitude, rotational speed, low-frequency eddy frequency, and other characteristics. Two orthogonal eddy current sensors process the rotor signal simultaneously, which can plot the rotor's shaft trajectory and present its motion characteristics over time.
[0043] Therefore, the corresponding number of the adjustment modules 20 can be set according to the actual distance adjustment needs, and the present invention does not limit this.
[0044] Furthermore, the long-distance slider 22 is provided with a slide rail facing inward, so that the micro slider 24 can slide along the long-distance slider 22; the long-distance slider 22 is also provided with a groove 221 for mounting the probe of the differential threader 23.
[0045] It should be understood that if the gap between the long slider 22 and the long slide rail 21 is too small, the long slider 22 will have difficulty sliding on the long slide rail 21; if the gap between the long slider 22 and the long slide rail 21 is too large, it will easily lead to excessive error. The same applies to the distance between the micro slider 24 and the long slider 22.
[0046] Therefore, the present invention sets the gap range between the long-distance slide rail 21 and the long-distance slider 22 to 20±1μm, and sets the gap range between the micro-slider 24 and the long-distance slider 22 to 20±1μm, so as to ensure that the slider can slide on the corresponding slide rail while avoiding excessive error.
[0047] Preferably, in this specific embodiment, the gap between the long-distance slide rail 21 and the long-distance slider 22 is 20 μm, and the gap between the micro-slider 24 and the long-distance slider 22 is 20 μm.
[0048] Furthermore, such as Figure 2 and Figure 3 As shown, the long-distance slide rail 21 is provided with a U-shaped groove 211, the long-distance slider 22 is provided at the front end of the long-distance slide rail 21, and the differential threader 23 is provided at the rear end of the long-distance slide rail 21 and is partially located in the U-shaped groove 211.
[0049] Furthermore, the macro slider 24 is a semi-disc structure; the macro slider 24 has a first mounting hole for mounting the eddy current sensor probe 30 and a second mounting hole for mounting the probe of the differential threader 23, wherein the first mounting hole is located in the upper half of the semi-disc structure and the second mounting hole is located in the lower half, so that the probe of the differential threader 23 can pass through the second mounting hole and be mounted on the macro slider 24.
[0050] Specifically, the adjustment module 20 also includes a retaining ring 25 for fixing the probe of the differential threader 23 and the micro slider 24. The retaining ring 25 is used to fix the micro slider 24 and the differential threader 23, and there should be no looseness between them.
[0051] Furthermore, such as Figure 3As shown, a first fixing member 26 is provided on each side of the long-distance slider 22. The first fixing member 26 is used to lock the position of the long-distance slider 22 when it slides to the target position. The differential threader 23 is fixed to the long-distance slider 22 by a second fixing member 27. A third fixing member 28 is provided on the micro slider 24. The third fixing member 28 is used to lock the position of the micro slider 24 when it moves to the target position. The adjustment module 20 also includes two fourth fixing members 29 for fixing the eddy current sensor probe 30 to the micro slider 24.
[0052] Specifically, in this preferred embodiment of the present invention, the first fixing member 26, the second fixing member 27 and the third fixing member 28 are bolts or screws, and the fourth fixing member 29 is a nut.
[0053] The process by which the distance adjuster 100 adjusts the distance between the eddy current sensor and the target being measured is as follows:
[0054] First, assemble the distance adjuster 100:
[0055] The base 10 and the long-distance slide rail 21 of the adjustment module 20 are fixed together by bolts, and the two adjustment modules 20 are installed on the base 10 in an orthogonal state.
[0056] The long slider 22 is installed on the long slide rail 21. The long slider 22 also has a small slide rail, which faces inward. At the same time, two first fixing members 26 are installed on the long slider 22.
[0057] The differential threader 23 is installed into the long-pitch slider 22 and fixed with the second fastener 27;
[0058] The eddy current sensor probe 30 is passed through the upper hole of the micro slider 24 and fixed with the two fourth fasteners 29.
[0059] The macro slider 24 is installed into the small slide rail in the long slider 22;
[0060] The probe of the differential threader 23 is passed through the hole at the lower end of the micro slider 24, and the micro slider 24 is connected to the differential threader 23 by the snap ring 25.
[0061] Finally, the micro-adjustment is installed onto the small cryogenic turbine expander 40, and the two are fastened together with bolts.
[0062] Coarse distance adjustment:
[0063] After all the parts are installed using the above method, during the distance adjustment process between the eddy current sensor probe 30 and the rotor 41 under test, the first step is to slide the long-distance slider 22 on the long-distance slide rail 21 so that the eddy current sensor probe 30 quickly approaches the rotor 41 under test, while the long-distance slide rail 21 remains relatively stationary.
[0064] Understandably, the coarse adjustment of the distance between the eddy current sensor probe 30 and the rotor 41 under test is achieved by sliding the long-distance slider 22 along the long-distance slide rail 21. This operation makes the distance adjustment fast.
[0065] Distance fine-tuning:
[0066] The second step is to rotate the differential threader 23. The probe of the differential threader 23 pushes the micro slider 24 to move back and forth along the small slide rail inside the long slider 22. The back and forth movement distance can be controlled at the micrometer level until the distance between the eddy current sensor probe 30 and the rotor 41 under test is appropriate. Then, the position of the micro slider 24 is fixed by the third fixing member 28.
[0067] It is understood that the fine adjustment of the distance between the eddy current sensor probe 30 and the rotor 41 under test is achieved by rotating the differential threader 23. The probe of the differential threader 23 pushes the micro-slider 24 along the track, thereby driving the eddy current sensor probe 30. This operation makes the distance adjustment accurate and avoids collisions between the rotor 41 under test and the eddy current sensor probe 30 during the high-speed rotation of the rotor 41.
[0068] It is also understood that when the coarse adjustment is in place, the first fixing member 26 should be tightened to fix the position of the long-distance slider 22; when the fine adjustment is in place, the third fixing member 28 should be tightened to fix the position of the fine-distance slider 24. This operation makes the distance adjustment stable.
[0069] It should be understood that the differential threader 23 achieves its probe's ability to move back and forth in a micro-range by rotation. The micro-slider 24, constrained by the small slide rail within the long slider 22, converts the rotational motion into translational motion, ultimately achieving the micro-translational motion of the eddy current sensor probe 30.
[0070] In another aspect, the present invention also provides an adjustment method for the distance adjuster 100, used to adjust the distance between the eddy current sensor and the target being measured, comprising the following steps:
[0071] The adjustment module 20 is installed on the base 10 to obtain the distance adjuster 100;
[0072] Install the distance adjuster 100 on the target being measured;
[0073] The long-distance slider 22 of the sliding adjustment module 20 allows the eddy current sensor probe 30 mounted on the long-distance slider 22 to approach the target being measured.
[0074] The position of the long-distance slider 22 is fixed by the first fixing member 26;
[0075] Rotating the differential threader 23 causes the probe of the differential threader 23 to push the micro slider 24 to slide along the long slider 22, thereby driving the eddy current sensor probe 30 to move micro-distance.
[0076] The position of the micro slider 24 is fixed by the third fixing member 28 until the eddy current sensor probe 30 is moved to the target distance.
[0077] This invention provides a distance adjuster 100 and a method. In the first step, the distance between the eddy current sensor probe 30 and the target being measured can be coarsely adjusted by adjusting the long-distance slider 22. In the second step, the distance between the eddy current sensor and the target being measured can be finely adjusted by adjusting the differential screwdriver 23. Thus, through the two processes of coarse adjustment and fine adjustment, the distance between the eddy current sensor probe 30 and the target being measured can be quickly and accurately adjusted to a suitable state to meet the distance adjustment requirements between the eddy current sensor and the rotor 41 of the turbine expander 40.
[0078] The distance adjuster 100 of the present invention has the advantages of easy disassembly and assembly, fast, accurate and stable adjustment. Moreover, the distance adjuster 100 can be adapted to small low temperature turbine expanders 40 of different sizes by replacing the base 10 of different sizes, and has the characteristics of wide versatility.
[0079] It should be understood that the distance adjuster 100 of the present invention can be used not only to adjust the distance between the eddy current sensor probe 30 and the rotor 41 under test, but also to adjust the distance between the eddy current sensor probe 30 and other targets under test, or between other probes and other detection targets. The present invention does not impose specific limitations on the application of the distance adjuster 100.
[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0081] The above embodiments merely illustrate preferred implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention should be determined by the appended claims.
Claims
1. A distance adjuster, characterized in that, The distance adjuster, used to adjust the distance between an eddy current sensor and a target, includes a base for mounting on the target and an adjustment module mounted on the base. The adjustment module includes a long-distance slide rail mounted on the base, a long-distance slider slidably mounted on the long-distance slide rail, a differential threaded joint mounted on the long-distance slide rail, and a micro-distance slider slidably mounted on the long-distance slider. The micro-distance slider is used to mount the eddy current sensor probe, and the differential threaded joint is connected to the micro-distance slider. The adjustment module achieves coarse adjustment of the distance between the eddy current sensor probe and the target by moving the long-distance slider relative to the long-distance slide rail. The differential threader drives the micro-slider to move relative to the long-distance slider, thereby achieving fine adjustment of the distance between the eddy current sensor probe and the target being measured. A first fixing member is provided on each side of the long-distance slider, which locks the position of the long-distance slider when it slides to the target position. The differential threader is fixed to the long-distance slider by a second fixing member. A third fixing member is provided on the micro-slider, which locks the position of the micro-slider when it moves to the target position. The adjustment module also includes two fourth fixing members for fixing the eddy current sensor probe to the micro-slider.
2. The distance adjuster according to claim 1, characterized in that, The long-distance slider is provided with a slide rail facing inward, so that the micro slider can slide along the long-distance slider; the long-distance slider is also provided with a slide groove for mounting the probe of the differential threader.
3. The distance adjuster according to claim 1, characterized in that, The gap between the long-distance slide rail and the long-distance slider is 20±1μm, and the gap between the micro-slider and the long-distance slider is 20±1μm.
4. The distance adjuster according to claim 1, characterized in that, The long-distance slide rail is provided with a U-shaped groove, the long-distance slider is provided at the front end of the long-distance slide rail, and the differential threader is provided at the rear end of the long-distance slide rail and is partially located in the U-shaped groove.
5. The distance adjuster according to claim 1, characterized in that, The micro slider has a semi-circular structure; the micro slider has a first mounting hole for mounting the eddy current sensor probe and a second mounting hole for mounting the probe of the differential threader; the adjustment module also includes a retaining ring for fixing the probe of the differential threader and the micro slider.
6. The distance adjuster according to claim 1, characterized in that, The base is a ring-shaped structure with multiple mounting holes spaced apart, and the long-distance slide rail is mounted on the base by bolts.
7. The distance adjuster according to claim 1, characterized in that, The first, second, and third fixing components are bolts or screws, and the fourth fixing component is a nut.
8. The distance adjuster according to any one of claims 1 to 7, characterized in that, There are two adjustment modules, which are installed orthogonally on the base. The target being measured is the rotor of a turbine expander.
9. A method for adjusting a distance adjuster according to any one of claims 1 to 8, characterized in that, The steps for adjusting the distance between the eddy current sensor and the target being measured include: Install the adjustment module on the base to obtain the distance adjuster; Install the distance adjuster on the target being measured; The long-distance slider of the sliding adjustment module allows the eddy current sensor probe mounted on the long-distance slider to approach the target being measured. The position of the long-distance slider is fixed by the first fixing component; The rotating differential threader causes the probe of the differential threader to push the micro slider along the long slider, thereby driving the micro movement of the eddy current sensor probe. The position of the micro slider is fixed by the third fixing component when the eddy current sensor probe is moved to the target distance.