Improved Wiegand sensor

Abstract

The utility model discloses an improved Wiegand sensor, which comprises a sensitive alloy wire and a detection coil, and the detection coil is wound on the outer ring surface of the sensitive alloy wire. The two ends of the sensitive alloy wire and the two ends of the detection coil are transversely fixed in the shell; the lower part of the pin is arranged inside the periphery of the shell, and outgoing lines at the two ends of the detection coil are welded with the bottom of the pin. A detection coil is sleeved on the outer ring surface of a sensitive alloy wire, and the detection coil and the sensitive alloy wire are transversely arranged in a shell; the pins are arranged inside the periphery of the shell and are in welded connection with the detection coil; the Wiegand sensor is good in stability and relatively accurate in detection; corrosion resistance and oxidation resistance are achieved, and the induction intensity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of Weigand sensors, and mainly relates to an improved Weigand sensor. Background Art

[0002] The existing manufacturing method of Weigand sensors is usually to process the hysteresis alloy wire to reach specific process points, then encapsulate the hysteresis alloy wire into a glass tube with a collecting coil on the outer layer, and then connect the rear encoder through the pins on the plastic shell.

[0003] The existing Weigand sensor process is relatively complex and requires at least steps of precise operation: stuffing the hysteresis alloy wire into the glass tube, installing the magnetic ring, and encapsulating the glass tube; the structure of the glass tube is not impact-resistant. Once the outer layer of the glass tube is damaged, the coil will contact the internal hysteresis alloy wire, which will first cause the sensor to fail, and secondly, there is a risk of short circuit for the overall workpiece. The hysteresis alloy wire itself also has the possibility of being oxidized, and its performance will change after oxidation, affecting the use of the overall sensor. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an improved Weigand sensor with good stability, relatively accurate detection, corrosion resistance, oxidation resistance, and enhanced induction intensity.

[0005] The technical problem to be solved by the utility model can be achieved by adopting the following technical solutions:

[0006] An improved Weigand sensor, characterized by comprising:

[0007] A sensitive alloy wire and a detection coil, the detection coil is wound on the outer circumferential surface of the sensitive alloy wire;

[0008] A housing, both ends of the sensitive alloy wire and the detection coil are horizontally fixed inside the housing;

[0009] Pins, the lower parts of the pins are arranged inside the outer circumference of the housing, and both ends of the detection coil are welded to the bottom of the pins.

[0010] In a preferred embodiment of the utility model, a dense protective layer is arranged on the outer surface of the sensitive alloy wire, and the detection coil is wound on the outer surface of the protective layer.

[0011] In a preferred embodiment of the utility model, magnetic rings are respectively sleeved on the outer circumferential surfaces at both ends of the sensitive alloy wire, and a pair of the magnetic rings are located at both ends of the detection coil.

[0012] In a preferred embodiment of the present utility model, mounting seats are respectively arranged on both sides in the length direction inside the housing. The longitudinal cross-sections on both sides of the mounting seat are respectively in an inverted convex shape, and a U-shaped groove is formed in the middle inside the mounting seat; both ends of the sensitive alloy wire are clamped in the inverted convex-shaped grooves of the mounting seat, and a pair of magnetic rings are respectively installed in the U-shaped grooves of a pair of the mounting seats.

[0013] In a preferred embodiment of the present utility model, the middle and lower part of the housing is in the shape of an open cuboid, and a pair of the mounting seats are respectively arranged on both sides of the middle and lower part of the housing; the cross-sectional shape of the upper part of the housing is an isosceles trapezoid.

[0014] In a preferred embodiment of the present utility model, first slots are respectively arranged at the outer two corners of the cuboid of the housing, and a pair of first pins are respectively arranged in a pair of the first slots.

[0015] In a preferred embodiment of the present utility model, a second slot is longitudinally arranged in the middle of the isosceles trapezoid of the housing, and a second pin is arranged in the second slot.

[0016] The beneficial effects of the present utility model are: an improved Weigand sensor, the detection coil is sleeved on the outer ring surface of the sensitive alloy wire and is horizontally installed in the housing together; the pins are arranged inside the outer periphery of the housing and are connected by soldering with the detection coil; the Weigand sensor has good stability and relatively accurate detection.

[0017] A dense protective layer is arranged on the outer surface of the sensitive alloy wire, which is corrosion-resistant and oxidation-resistant, preventing the sensor from failing and short-circuiting; the detection coil is directly installed on the hysteresis alloy wire after being coated with the protective layer, reducing the relative distance between the coil and the alloy wire, improving the induction intensity, and enhancing both the technical indicators and stability of the sensor itself. Description of the Drawings

[0018] Figure 1 It is a structural schematic diagram of an improved Weigand sensor of the present utility model.

[0019] Figure 2 It is an exploded structure diagram of an improved Weigand sensor of the present utility model.

[0020] Reference Numerals in the Drawings

[0021] 10 Housing, 11 Cuboid, 12 Isosceles Trapezoid; Mounting Seats: 13 Inverted Convex Shape, 14 U-shaped Groove.

[0022] 21 Sensitive Alloy Wire, 22 Protective Layer; 23 Detection Coil, 24 Magnetic Ring.

[0023] 31 First Slot, 32 First Pin; 33 Second Slot, 34 Second Pin. Detailed Implementation Modes

[0024] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below with reference to specific drawings.

[0025] Refer to Figures 1 to 2 , which shows an improved Weigand sensor, including: a sensitive alloy wire 21 and a detection coil 23, the detection coil 23 is wound around the outer circumferential surface of the sensitive alloy wire 21; a housing 10, both ends of the sensitive alloy wire 21 and the detection coil 23 are horizontally fixed inside the housing 10; pins, the lower part of the pins is arranged inside the outer circumference of the housing 10, and both ends of the detection coil 23 are led out and welded to the bottom of the pins. Specifically, the sensitive alloy wire 21 is also called a hysteresis alloy wire; the coil is connected to a subsequent sensor through the pins on the housing 10 to achieve the function of outputting a signal.

[0026] The detection coil 23 of the present utility model is sleeved on the outer circumferential surface of the sensitive alloy wire 21 and is horizontally installed in the housing 10 together; the pins are arranged inside the outer circumference of the housing 10 and are welded to the detection coil 23; the Weigand sensor has good stability and relatively accurate detection.

[0027] In this preferred embodiment, a dense protective layer 22 is provided on the outer surface of the sensitive alloy wire 21, and the detection coil 23 is wound around the outer surface of the protective layer 22. Specifically, a protective layer 22 with insulation or air isolation function is provided on the outer layer of the sensitive alloy wire 21. The coating material of the protective layer 22 is one or several of materials such as epoxy resin, PET, epoxy resin, PET, paint, metal, oxide, etc. The conductivity of the protective layer 22 is lower than that of the sensitive alloy wire 21.

[0028] The above invention improves the overall structure. A dense protective layer 22 is provided on the outer surface of the sensitive alloy wire 21 (hysteresis alloy wire). The protective layer 22 is made of insulating material, which is corrosion-resistant and oxidation-resistant, preventing the sensor from failing and short-circuiting; the original structure of encapsulating the hysteresis alloy wire into a glass tube is cancelled, and the detection coil 23 (acquisition coil) is directly installed on the hysteresis alloy wire after being coated with the protective layer 22; the relative distance between the coil and the alloy wire is reduced, the induction intensity is increased, and both the technical indexes and stability of the sensor itself are improved.

[0029] The technological process of the present utility model is as follows: First, the sensitive alloy wire 21 (hysteresis alloy wire) is processed into a sensitive alloy wire with rapid magnetic reversal ability through a combination of a series of deformation processing techniques, heat treatment techniques, and surface treatment techniques; then, the above-mentioned sensitive alloy wire 21 (hysteresis alloy wire) is subjected to a film covering treatment to manufacture a dense protective layer 22 on its outer part; finally, the film-covered sensitive alloy wire 21 is assembled into the prepared coil.

[0030] In this preferred embodiment, magnetic rings 24 are respectively sleeved on the outer ring surfaces at both ends of the sensitive alloy wire 21, and a pair of the magnetic rings 24 are located at both ends of the detection coil 23.

[0031] In this preferred embodiment, mounting seats are respectively arranged on both sides in the length direction inside the housing 10. The longitudinal cross-sections on both sides of the mounting seats are respectively in an inverted convex shape 13, and a U-shaped groove 14 is formed in the middle inside the mounting seats; both ends of the sensitive alloy wire 21 are clamped in the inverted convex-shaped 13 grooves of the mounting seats, and a pair of the magnetic rings 24 are respectively installed in the U-shaped grooves 14 of a pair of the mounting seats.

[0032] In this preferred embodiment, the middle and lower part of the housing 10 is in the shape of an open-top cuboid 11, and a pair of the mounting seats are respectively arranged on both sides of the middle and lower part of the housing 10; the cross-sectional shape of the upper part of the housing 10 is an isosceles trapezoid 12.

[0033] In this preferred embodiment, the pins include a pair of first pins 32 and a second pin 34; first slots 31 are respectively arranged at the outer corners of the cuboid 11 of the housing 10, and a pair of first pins 32 are respectively arranged in a pair of the first slots 31.

[0034] Furthermore, a second slot 33 is longitudinally arranged in the middle of the isosceles trapezoid 12 of the housing 10, and the second pin 34 is arranged in the second slot 33.

[0035] The above has shown and described the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An improved Wiegand sensor, characterized in that: include: A sensitive alloy wire and a detection coil, wherein the detection coil is wound around the outer ring surface of the sensitive alloy wire; A housing, wherein the sensitive alloy wire and two ends of the detection coil are transversely fixed inside the housing; The lower part of the pin is arranged inside the outer periphery of the shell, and the two ends of the detection coil are welded to the bottom of the pin.

2. An improved Wiegand sensor as claimed in claim 1, characterized in that: A dense protective layer is arranged on the outer surface of the sensitive alloy wire, and the detection coil is wound on the outer surface of the protective layer.

3. An improved Wiegand sensor as claimed in claim 2, characterized in that: Magnetic rings are respectively sleeved on the outer ring surfaces at both ends of the sensitive alloy wire, and a pair of the magnetic rings are located at both ends of the detection coil.

4. An improved Wiegand sensor as claimed in claim 3, characterized in that: Mounting seats are respectively arranged on both sides of the length direction inside the shell, and the longitudinal sections of the two sides of the mounting seats are respectively in the shape of an inverted convex letter, and a U-shaped groove is formed in the inner middle part of the mounting seat; both ends of the sensitive alloy wire are clamped in the inverted convex letter groove of the mounting seat, and a pair of the magnetic rings are respectively installed in the U-shaped grooves of a pair of the mounting seats.

5. An improved Wiegand sensor as claimed in claim 4, characterized in that: The middle and lower part of the shell is in the shape of a rectangular parallelepiped with an open cover, and a pair of mounting seats are respectively arranged on both sides of the middle and lower part of the shell; the cross-sectional shape of the upper part of the shell is an isosceles trapezoid.

6. An improved Wiegand sensor as claimed in claim 5, characterized in that: First slots are respectively arranged at two outer corners of the cuboid of the shell, and a pair of first pins are respectively arranged in the pair of first slots.

7. An improved Wiegand sensor as claimed in claim 6, characterized in that: A second slot is longitudinally arranged in the middle of the isosceles trapezoid of the housing, and the second pin is arranged in the second slot.

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