A differential transformer feedback device

Abstract

The utility model discloses a differential transformer feedback device, including installation structure, differential transformer and transmission structure, installation structure is used to install in the body of equipment to be detected, differential transformer includes sleeve main part and mobile metal core, and sleeve main part is installed to installation structure, and mobile metal core is along the axial activity and is established in sleeve main part, and when deviating from initial position, the induced electromotive force is generated, transmission structure has two transmission ends of being connected, and transmission end can be opposite another transmission end and is along arbitrary direction activity, and one of two transmission ends is connected mobile metal core, and another is used to install in the regulating door door pole of equipment to be detected. The scheme can make up the difference caused by the insufficient perpendicularity through adjusting the initial telescopic amount of mobile metal core and the universal activity of two transmission ends, so that mobile metal core does not produce the interference between sleeve main part when following regulating door door pole activity, avoids mobile metal core and coil abrasion, prolongs the service life of device.

Description

Technical Field

[0001] This utility model relates to the field of differential transformer technology, and specifically to a differential transformer feedback device. Background Technology

[0002] Linear Variable Displacement Transducer (LVDT) is a widely used precision displacement sensor in the position feedback of turbine control valves in thermal power plants. During on-site installation, the LVDT's sleeve body is welded to the turbine body using a fixed bracket. The LVDT's moving metal core is connected to the control valve stem via a mechanical connecting rod. When the control valve opens or closes, the valve stem moves the moving metal core up and down within the sleeve body, outputting a DC voltage signal proportional to the valve position movement, which is then sent to the electro-hydraulic control system.

[0003] Publication number CN211900706U discloses a novel regulating valve LVDT. The iron core (movable metal core) of the LVDT runs through the interior of the LVDT shell (sleeve body). A limit nut is threaded onto the iron core. The iron core is sequentially connected to a first self-tightening nut, a first spring washer, and a first flat washer. The iron core passes through the regulating valve connecting rod (regulating valve rod), and the LVDT shell is mounted on the turbine body via a fixing plate. Thus, when the regulating valve connecting rod moves, it drives the iron core to extend and retract, completing the measurement.

[0004] However, when the fixing plate is installed on the turbine body, there is a situation where the iron core and the sleeve body interfere due to insufficient verticality, which in turn causes wear on the coils in the iron core and the sleeve body, shortening the service life of the LVDT. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a differential transformer feedback device to solve the technical problem in the prior art where insufficient verticality causes interference between the iron core and the sleeve body when the fixing plate is installed on the turbine body, which in turn leads to wear of the coils in the iron core and the sleeve body and shortens the service life of the LVDT.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a differential transformer feedback device, comprising:

[0008] The mounting structure is used to install it onto the body of the device to be tested;

[0009] A differential transformer includes a bushing body and a movable metal core. The bushing body is mounted on the mounting structure, and the movable metal core is movably disposed on the bushing body along its axial direction, generating an induced electromotive force when deviating from its initial position.

[0010] The transmission structure has two connected transmission ends, each of which can move in any direction relative to the other transmission end. One of the two transmission ends is connected to the movable metal core, and the other is used to install on the adjustment gate rod of the device to be tested.

[0011] In some embodiments, the transmission structure includes a first transmission part and a second transmission part. The first transmission part is rotatably mounted on the adjusting door rod, and the second transmission part is rotatably mounted on the first transmission part, with its rotation axis intersecting the rotation axis of the first transmission part and connected to the movable metal core.

[0012] The two transmission ends are respectively formed in the first transmission part and the second transmission part.

[0013] In some embodiments, the second transmission part is movable relative to the movable metal core along its axial direction and can be maintained in the position after the movement.

[0014] In some embodiments, the second transmission part is provided with a connecting channel along the axial direction of the movable metal core, the inner wall of the connecting channel is provided with an internal thread, the movable metal core is provided with an external thread corresponding to the internal thread, and is threadedly connected to the second transmission part via the internal thread.

[0015] In some embodiments, the first transmission part includes a first transmission arm, a first transmission seat and two first connecting plates. The first transmission arm is rotatably mounted on the adjusting door rod and connected to the first transmission seat. The two first connecting plates are connected to the first transmission seat and located on the side of the first transmission seat away from the first transmission arm, and are spaced apart. Both first connecting plates are provided with a first through hole.

[0016] The transmission structure further includes a first bolt and a first nut. The first bolt passes through two first through holes and has a first rotating shaft section located between the two first through holes, and has a first threaded section located outside the first through holes. The first nut is screwed onto the first threaded section. The second transmission part is provided with a second shaft hole for the first rotating shaft section to pass through.

[0017] In some embodiments, the differential transformer feedback device further includes a transition plate and two second connecting plates. The transition plate is used to fix the regulating gate rod. The two second connecting plates are connected at intervals to the same side of the transition plate and each is provided with a second through hole. The axial direction of the second through hole intersects the axial direction of the first through hole.

[0018] The transmission structure further includes a second bolt and a second nut. The second bolt passes through two second through holes and has a second rotating shaft section located between the two second through holes, and a second threaded section located outside the second through holes. The second nut is screwed into the second threaded section. The first transmission arm has a first shaft hole for the second rotating shaft section to pass through, and is rotatably mounted on the adjusting door rod via the second connecting plate and the transition plate.

[0019] In some embodiments, the transition plate includes a fixed plate and a second transmission seat, the fixed plate being fixed to the adjusting door rod, and the second transmission seat being detachably connected to the fixed plate;

[0020] The two second connecting plates are connected to the second transmission seat and are located on the side of the second transmission seat away from the fixed plate.

[0021] In some embodiments, the fixing plate is provided with fixing holes along the axial direction of the movable metal core;

[0022] The second transmission seat is connected to a fixing screw, which passes through the fixing hole. The transition plate also includes a fixing nut, which is screwed onto the end of the fixing screw that extends out of the fixing hole.

[0023] In some embodiments, the transition plate extends radially along the sleeve body, with one end of its extension direction used to fix to the adjusting door rod, and the other end connected to the second connecting plate;

[0024] The mounting structure is provided with a limiting channel for the transition plate to pass through, and the limiting channel extends along the axial direction of the movable metal core.

[0025] In some embodiments, a scale line is provided at the end edge of the limiting channel, and the scale line is arranged along the axial direction of the movable metal core.

[0026] Compared with existing technologies, the differential transformer feedback device provided by this utility model has two transmission ends that are rotatably mounted on the moving metal core of the differential transformer and the regulating valve rod of the turbine, respectively. Furthermore, the two transmission ends are capable of relative universal movement. Therefore, when the sleeve body of the differential transformer is installed on the turbine body via the mounting structure, the moving metal core of the differential transformer and the transmission ends on the regulating valve rod have a certain amount of mobility. Consequently, when the verticality of the sleeve body is insufficient, the initial extension and retraction of the moving metal core and the universal movement of the two transmission ends can compensate for the verticality deficiency. This ensures that the moving metal core does not interfere with the sleeve body when moving with the regulating valve rod, preventing wear on the moving metal core and coils and extending the device's service life. Attached Figure Description

[0027] Figure 1 This is an assembly drawing of the differential transformer feedback device provided in this embodiment of the utility model;

[0028] Figure 2 yes Figure 1 A schematic diagram of the metal core, transmission structure, and transition plate of China Mobile.

[0029] Figure 3 yes Figure 2 Exploded view of the metal core, transmission structure and transition plate of China Mobile;

[0030] Figure 4 yes Figure 2 Exploded view of the first transmission unit, the second transmission unit, and the second transmission base.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Installation structure; 1a. Limiting groove; 11. Scale line; 2. Differential transformer; 21. Sleeve body; 22. Moving metal core; 3. Transmission structure; 31. Transmission end; 32. First transmission part; 321. First transmission arm; 321a. First shaft hole; 322. First transmission seat; 323. First connecting plate; 323a. First through hole; 33. Second transmission part; 33a. Connecting channel; 33b. Second shaft hole; 3 4. First bolt; 341. First shaft section; 342. First threaded section; 35. First nut; 36. Second bolt; 361. Second shaft section; 362. Second threaded section; 37. Second nut; 4. Transition plate; 41. Fixing plate; 41a. Fixing hole; 42. Second transmission seat; 43. Fixing screw; 44. Fixing nut; 5. Second connecting plate; 5a. Second through hole; 6. Turbine body; 7. Adjusting valve rod. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] To address the technical problem of interference between the iron core and the sleeve body due to insufficient verticality when installing the fixed plate on the turbine body, which leads to wear of the coils inside the iron core and sleeve body and shortens the service life of the LVDT, this utility model provides a differential transformer feedback device. It can compensate for the drop caused by insufficient verticality by adjusting the initial extension and retraction of the moving metal core and the universal movement of the two transmission ends. This ensures that the moving metal core will not interfere with the sleeve body when following the movement of the regulating valve rod, avoiding wear of the moving metal core and coils and extending the service life of the device.

[0035] Please see Figures 1 to 3 , Figures 1 to 3 This is a schematic diagram of the differential transformer 2 feedback device in one embodiment of the present invention. The differential transformer 2 feedback device includes an installation structure 1, a differential transformer 2, and a transmission structure 3. The installation structure 1 is used to install on the body of the device to be tested. The differential transformer 2 includes a sleeve body 21 and a movable metal core 22. The sleeve body 21 is installed on the installation structure 1, and the movable metal core 22 is movably installed on the sleeve body 21 along its axial direction and generates an induced electromotive force when it deviates from the initial position. The transmission structure 3 has two connected transmission ends 31. The transmission end 31 can move in any direction relative to the other transmission end 31. One of the two transmission ends 31 is connected to the movable metal core 22, and the other is used to install on the adjusting gate rod 7 of the device to be tested.

[0036] In the differential transformer 2 feedback device provided by this utility model, since the two transmission ends 31 of the transmission structure 3 are respectively rotatably mounted on the movable metal core 22 of the differential transformer 2 and the regulating valve rod 7 of the turbine, and the two transmission ends 31 can move in a omnidirectional manner relative to each other, when the sleeve body 21 of the differential transformer 2 is installed on the body 6 of the turbine via the mounting structure 1, the movable metal core 22 of the differential transformer 2 and the transmission ends 31 on the regulating valve rod 7 have a certain amount of mobility. Therefore, when the verticality of the sleeve body 21 is insufficient, the drop caused by the insufficient verticality can be compensated by adjusting the initial extension and retraction of the movable metal core 22 and the omnidirectional movement of the two transmission ends, so that the movable metal core 22 will not interfere with the sleeve body 21 when it moves with the regulating valve rod 7, avoiding wear of the movable metal core 2 and the coil, and extending the service life of the device.

[0037] It should be noted that, in this case, the aforementioned equipment to be tested refers to a steam turbine, and the movable metal core 22 is an iron core. Furthermore, the mounting structure 1 can be configured as a mounting bracket, mounting base, or mounting plate. Additionally, the transmission structure 3 can be configured as a universal joint, two connected ball joints, a universal joint and ball joint combination, or other forms.

[0038] In one embodiment, the transmission structure 3 includes a first transmission part 32 and a second transmission part 33. The first transmission part 32 is rotatably mounted on the adjusting door rod 7, and the second transmission part 33 is rotatably mounted on the first transmission part 32, with its rotation axis intersecting the rotation axis of the first transmission part 32 and connected to the movable metal core 22. Two transmission ends 31 are respectively formed in the first transmission part 32 and the second transmission part 33.

[0039] In this embodiment, the axis of rotation of the first transmission part 32 relative to the door handle 7 is the first axis, and the axis of rotation of the second transmission part 33 relative to the first transmission part 32 is the second axis. Since the first axis and the second axis intersect, the two transmission ends 31 on the first transmission part 32 and the second transmission part 33 can move in all directions relative to each other, resulting in a simple and reliable structure. It should be noted that the two transmission parts can be configured as transmission seats, transmission arms, transmission frames, or other forms.

[0040] In one embodiment, the second transmission unit 33 is capable of moving relative to the movable metal core 22 along its axial direction and can maintain the position after the movement.

[0041] In this embodiment, the overall length of the second transmission part 33 and the movable metal core 22 is adjusted by adjusting the position of the second transmission part 33 in the axial direction of the movable metal core 22. This eliminates the need to change the relative position of the movable metal core 22 with respect to the sleeve body 21, avoiding the need to recalibrate the differential transformer 2 and improving assembly convenience. It should be noted that the movable metal core 22 can rotate relative to the sleeve body 21 around its axis.

[0042] In one embodiment, the second transmission part 33 is provided with a connecting channel 33a along the axial direction of the movable metal core 22. The inner wall of the connecting channel 33a is provided with an internal thread, and the movable metal core 22 is provided with an external thread corresponding to the internal thread, and is threadedly connected to the second transmission part 33 via the internal thread.

[0043] In this embodiment, the second transmission part 33 and the movable metal core 22 are connected by a threaded engagement to achieve position adjustment of the second transmission part 33 in the axial direction of the movable metal core 22, resulting in a simple and reliable structure. Specifically, in this solution, the second transmission part 33 is configured as a transmission sleeve.

[0044] In one embodiment, please refer to Figure 3 and Figure 4 The first transmission part 32 includes a first transmission arm 321, a first transmission seat 322, and two first connecting plates 323. The first transmission arm 321 is rotatably mounted on the adjusting door rod 7 and connected to the first transmission seat 322. The two first connecting plates 323 are connected to the first transmission seat 322 and are located on the side of the first transmission seat 322 away from the first transmission arm 321 and are spaced apart. Both first connecting plates 323 are provided with a first through hole 323a. The transmission structure 3 also includes a first bolt 34 and a first nut 35. The first bolt 34 passes through the two first through holes 323a and has a first rotating shaft section 341 located between the two first through holes 323a and a first threaded section 342 located outside the first through hole 323a. The first nut 35 is screwed into the first threaded section 342. The second transmission part 33 is provided with a second shaft hole 33b for the first rotating shaft section 341 to pass through.

[0045] In this embodiment, the second transmission part 33 is rotatably mounted on the first shaft section 341 of the first bolt 34 via the second shaft hole 33b. When maintenance of the second transmission part 33 is required, the first nut 35 can be removed, and the first bolt 34 and the second transmission part 33 can be taken off, making the operation relatively convenient. In addition, the two first connecting plates 323 can protect the shaft hole portion of the second transmission part 33.

[0046] In one embodiment, the differential transformer 2 feedback device further includes a transition plate 4 and two second connecting plates 5. The transition plate 4 is used to fix to the regulating gate rod 7. The two second connecting plates 5 are connected at intervals on the same side of the transition plate 4 and each has a second through hole 5a. The axial direction of the second through hole 5a intersects the axial direction of the first through hole 323a. The transmission structure 3 further includes a second bolt 36 and a second nut 37. The second bolt 36 passes through the two second through holes 5a and has a second rotating shaft section 361 located between the two second through holes 5a and a second threaded section 362 located outside the second through hole 5a. The second nut 37 is screwed into the second threaded section 362. The first transmission arm 321 has a first shaft hole 321a for the second rotating shaft section 361 to pass through and is rotatably mounted on the regulating gate rod 7 via the second connecting plate 5 and the transition plate 4.

[0047] In this embodiment, the first transmission arm 321 is rotatably mounted on the first rotating shaft section 341 of the second bolt 36 via the first shaft hole 321a thereon. Similarly, when the first transmission part 32 needs maintenance, the second nut 37 can be removed, and then the second bolt 36 and the first transmission part 32 can be removed.

[0048] In one embodiment, the transition plate 4 includes a fixed plate 41 and a second transmission seat 42. The fixed plate 41 is used to fix the door rod 7, and the second transmission seat 42 is detachably connected to the fixed plate 41. Two second connecting plates 5 are connected to the second transmission seat 42 and are located on the side of the second transmission seat 42 away from the fixed plate 41.

[0049] In this embodiment, the fixing plate 41 is first fixed to the adjusting door rod 7, then the second transmission part 33 and the first transmission part 32 are sequentially connected to the movable metal core 22, then the second transmission seat 42 is connected to the first transmission arm 321 via two second connecting plates 5, and finally the second transmission seat 42 is fixed to the fixing plate 41, thereby improving the ease of assembly.

[0050] It should be noted that the second transmission seat 42 and the fixed plate 41 can be detachably connected by bolts, clips, pins or other structures.

[0051] In one embodiment, the fixing plate 41 is provided with a fixing hole 41a along the axial direction of the movable metal core 22; the second transmission seat 42 is connected to a fixing screw 43, which passes through the fixing hole 41a; the transition plate 4 also includes a fixing nut 44, which is screwed onto the end of the fixing screw 43 that extends out of the fixing hole 41a.

[0052] In this embodiment, the second transmission seat 42 is detachably connected to the fixed plate 41 by the cooperation of the fixing screw 43 and the fixing nut 44, which is simple and reliable.

[0053] In one embodiment, the transition plate 4 extends radially along the sleeve body 21, and one end of its extension direction is used to fix it to the adjusting door rod 7, while the other end is connected to the second connecting plate 5; the mounting structure 1 is provided with a limiting channel 1a through which the transition plate 4 passes, and the limiting channel 1a extends axially along the movable metal core 22.

[0054] In this embodiment, the transition plate 4 can be limited by the limiting channel 1a, thereby restricting the movement of the adjusting door rod 7 to an excessive position and improving safety.

[0055] In one embodiment, a scale line 11 is provided at the end edge of the limiting channel 1a, and the scale line 11 is arranged along the axial direction of the movable metal core 22.

[0056] In this embodiment, the opening degree of the adjusting door rod 7 can be intuitively confirmed via the scale line 11, improving convenience. It should be noted that, in one embodiment, the fixing plate 41 includes two splicing plates, which are connected by bolts and surround a channel to be fitted and fixed to the outer periphery of the adjusting door rod 7.

[0057] To better understand this utility model, the following is combined with... Figures 1 to 4 The technical solution of this utility model is described in detail below:

[0058] In this embodiment, during assembly, the mounting structure 1 is first installed on the turbine body 6. Then, the second transmission part 33 is threadedly connected to the movable metal core 22 via the connecting channel 33a. Next, the shaft hole of the second transmission part 33 is fitted onto the first bolt 34 of the first transmission part 32, and then assembled onto the first connecting plate 323 via the first nut 35. Thus, when the first transmission arm 321 is installed on the second connecting plate 5, the first transmission seat 322 can be rotated flexibly, and the first transmission part 32 can move axially along the movable metal core 22. Simultaneously, the relative position of the first transmission arm 321 and the second bolt 36 is adjusted to compensate for the drop caused by insufficient verticality, preventing interference and wear between the movable metal core 22 and the sleeve body 21 during movement, thereby extending its service life.

[0059] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A differential transformer feedback device, characterized in that, include: The mounting structure is used to install it onto the body of the device to be tested; A differential transformer includes a bushing body and a movable metal core. The bushing body is mounted on the mounting structure, and the movable metal core is movably disposed on the bushing body along its axial direction, generating an induced electromotive force when deviating from its initial position. The transmission structure has two connected transmission ends, each of which can move in any direction relative to the other transmission end. One of the two transmission ends is connected to the movable metal core, and the other is used to install on the adjustment gate rod of the device to be tested.

2. The differential transformer feedback device according to claim 1, characterized in that, The transmission structure includes a first transmission part and a second transmission part. The first transmission part is rotatably mounted on the adjusting door rod, and the second transmission part is rotatably mounted on the first transmission part, with its rotation axis intersecting the rotation axis of the first transmission part, and connected to the movable metal core. The two transmission ends are respectively formed in the first transmission part and the second transmission part.

3. The differential transformer feedback device according to claim 2, characterized in that, The second transmission unit can move relative to the movable metal core along its axial direction and can maintain the position after the movement.

4. The differential transformer feedback device according to claim 3, characterized in that, The second transmission part is provided with a connecting channel along the axial direction of the movable metal core. The inner wall of the connecting channel is provided with an internal thread. The movable metal core is provided with an external thread corresponding to the internal thread and is threadedly connected to the second transmission part via the internal thread.

5. The differential transformer feedback device according to claim 2, characterized in that, The first transmission part includes a first transmission arm, a first transmission seat and two first connecting plates. The first transmission arm is rotatably mounted on the adjusting door rod and connected to the first transmission seat. The two first connecting plates are connected to the first transmission seat and located on the side of the first transmission seat away from the first transmission arm, and are spaced apart. Both first connecting plates are provided with a first through hole. The transmission structure further includes a first bolt and a first nut. The first bolt passes through two first through holes and has a first rotating shaft section located between the two first through holes, and has a first threaded section located outside the first through holes. The first nut is screwed onto the first threaded section. The second transmission part is provided with a second shaft hole for the first rotating shaft section to pass through.

6. The differential transformer feedback device according to claim 5, characterized in that, The differential transformer feedback device further includes a transition plate and two second connecting plates. The transition plate is used to fix the regulating gate rod. The two second connecting plates are connected to the same side of the transition plate at intervals and each is provided with a second through hole. The axial direction of the second through hole intersects the axial direction of the first through hole. The transmission structure further includes a second bolt and a second nut. The second bolt passes through two second through holes and has a second rotating shaft section located between the two second through holes, and a second threaded section located outside the second through holes. The second nut is screwed into the second threaded section. The first transmission arm has a first shaft hole for the second rotating shaft section to pass through, and is rotatably mounted on the adjusting door rod via the second connecting plate and the transition plate.

7. The differential transformer feedback device according to claim 6, characterized in that, The transition plate includes a fixed plate and a second transmission seat. The fixed plate is used to fix the adjusting door rod, and the second transmission seat is detachably connected to the fixed plate. The two second connecting plates are connected to the second transmission seat and are located on the side of the second transmission seat away from the fixed plate.

8. The differential transformer feedback device according to claim 7, characterized in that, The fixing plate is provided with fixing holes along the axial direction of the movable metal core; The second transmission seat is connected to a fixing screw, which passes through the fixing hole. The transition plate also includes a fixing nut, which is screwed onto the end of the fixing screw that extends out of the fixing hole.

9. The differential transformer feedback device according to claim 6, characterized in that, The transition plate extends radially along the sleeve body, with one end of its extension direction used to fix to the adjusting door rod, and the other end connected to the second connecting plate. The mounting structure is provided with a limiting channel for the transition plate to pass through, and the limiting channel extends along the axial direction of the movable metal core.

10. The differential transformer feedback device according to claim 9, characterized in that, The limiting channel has scale lines at its end edge, and the scale lines are arranged along the axial direction of the movable metal core.

Images