Linear differential transformer type displacement sensor iron core assembly structure

Abstract

The utility model belongs to the technology of LVDT (Linear Variable Differential Transformer), and relates to an iron core assembly structure of a linear differential transformer type displacement sensor. The iron core assembly comprises a connecting rod (1) and a mover iron core (2), the connecting rod (1) of the iron core assembly is of a stepped cylinder structure, and the mover iron core (2) is of a cylindrical sleeve structure. The connecting rod (1) and the rotor iron core (2) are installed in a sleeved mode, a side face seam and a bottom face seam are welded and fixed in a laser welding mode, the effect that the rotor iron core (2) affects a magnetic field in a stator assembly is guaranteed, and meanwhile the connecting strength of the rotor iron core (2) is guaranteed through the two welding seams. The risk that the relatively long iron core assembly is broken from the welding position is avoided, the reliability of the product is improved, and the iron core assembly is more suitable for aviation equipment products.

Description

TECHNICAL FIELD

[0001] The utility model belongs to LVDT utility model technology relates to a kind of linear variable differential transformer type displacement sensor core subassembly structure. BACKGROUND

[0002] Linear variable differential transformer type displacement sensor is driven by measured mechanism with mover subassembly, and mover core outputs different voltage signals at different positions.Iron core subassembly is the most important part of the composition mover subassembly, and currently iron core subassembly is assembled and welded using non-magnetic stainless steel and soft magnetic alloy.The structure is assembled with two generally small-diameter cylinders, and the joint is welded and fixed.If the length of iron core subassembly is too large, the strength of one weld may not be sufficient, and the iron core subassembly may break at the weld. SUMMARY

[0003] The utility model aims at: design a kind of novel linear variable differential transformer type displacement sensor core subassembly structure, by changing the structure of connecting rod and mover core, installation mode, so that iron core subassembly meets the effect of mover core in stator subassembly on magnetic field, and the overall strength is strengthened.The risk of breakage of relatively long iron core subassembly at the weld can be effectively avoided, and the reliability of the product is improved.

[0004] The technical scheme of the utility model is: a kind of linear variable differential transformer type displacement sensor core subassembly structure, the iron core subassembly includes connecting rod 1 and mover core 2, and the mover core 2 is installed with connecting rod 1 in sleeve, and side joint 3 and bottom joint 4 are welded and fixed.

[0005] The connecting rod 1 is a stepped cylindrical structure, and the length of the small-diameter end is consistent with the length of the mover core 2.

[0006] The mover core 2 is a cylindrical sleeve structure, and is gap-fitted with the connecting rod 1.

[0007] The diameter of the iron core subassembly is greater than 3 mm.

[0008] The depth of the welding is 0.5 mm-1 mm.

[0009] The welding adopts laser welding.

[0010] The utility model has the beneficial effects of a kind of novel linear variable differential transformer type displacement sensor core subassembly structure, and the side joint and bottom joint of connecting rod 1 and mover core 2 are welded by two laser beams, which meets the effect of mover core in stator subassembly on magnetic field, and also enhances the structural strength.The risk of breakage of relatively long iron core subassembly at the weld can be effectively avoided, and the reliability of the product is improved, which is more suitable for aviation equipment products. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 Novel core assembly structure for linear differential transformer type displacement sensor with nested installation.

[0012] Wherein: 1- connecting rod, 2- mover core, 3- side joint, 4- bottom joint DETAILED DESCRIPTION

[0013] The utility model will be further described in detail. Referring to Figure 1 A linear differential transformer type displacement sensor core assembly structure, the core assembly includes a connecting rod 1 and a mover core 2, the mover core 2 is nested with the connecting rod 1, and the side joint 3 and the bottom joint 4 are welded and fixed.

[0014] The connecting rod 1 is a stepped cylindrical structure, and the length of the small-diameter end is consistent with the length of the mover core 2. The strength of this integrated structure is obviously improved compared with the segmented type. The mover core 2 is a cylindrical sleeve structure.

[0015] The mover core 2 is a cylindrical sleeve structure, and is gap-fitted with the connecting rod 1. This structure can meet the requirements of the magnetic properties of the core and can be installed with the connecting rod 1. After installation, laser welding is used for fixation, which greatly improves the connection strength and can meet the structural strength requirements of longer core assemblies.

[0016] The diameter of the core assembly is greater than 3 mm.

[0017] The welding depth is 0.5-1 mm.

[0018] Laser welding is used for welding. The connection strength is greatly improved, and the structural strength requirements of longer core assemblies can be met.

[0019] After the connecting rod 1 and the mover core 2 are welded, there is a concave at the weld joint. The weld surface is ground flat to improve the appearance.

Claims

1. A linear variable differential transformer displacement sensor core assembly structure, characterized by, The iron core assembly comprises a connecting rod (1) and a mover iron core (2); the mover iron core (2) is fitted with the connecting rod (1) in a sleeve manner, and a side joint (3) and a bottom joint (4) are welded and fixed.

2. A linear differential transformer displacement sensor core assembly structure according to claim 1, characterized in that, The connecting rod (1) is a stepped cylinder structure, and the length of the small-diameter end is consistent with the length of the mover iron core (2).

3. A linear differential transformer displacement sensor core assembly structure according to claim 1, wherein The mover iron core (2) is a cylinder sleeve structure, and is in clearance fit with the connecting rod (1).

4. A linear differential transformer displacement sensor core assembly structure according to claim 1, characterized in that, The diameter of the iron core assembly is greater than 3 mm.

5. A linear differential transformer displacement sensor core assembly structure according to claim 1, wherein The depth of the welding is 0.5-1 mm.

6. A linear differential transformer displacement sensor core assembly structure according to claim 1, wherein The welding is performed by laser welding.

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