A displacement sensor

Abstract

The present invention is applicable to the field of sensor structure technology, and provides a displacement sensor. The displacement sensor of the present invention comprises a coil assembly, an iron core arranged in the coil assembly and capable of axially moving relative to the coil assembly, and a compensation structure sleeved outside the coil assembly, the compensation structure is used to hinder or enhance the magnetic field generated by the movement of the iron core relative to the coil assembly to compensate for the output voltage of the coil assembly. In the actual production process, when the linearity of the coil assembly exceeds the specification requirements and the output voltage deviation is large, the compensation structure can be arranged outside the coil assembly to compensate for the output voltage of the coil assembly, so that the linearity of the coil assembly meets the requirements, thereby reducing the scrap rate of the coil assembly, which can effectively improve production efficiency and reduce production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor structures, and in particular to a displacement sensor. Background Art

[0002] Displacement sensor, also known as linear sensor, is a linear device belonging to metal induction. The function of the sensor is to convert various measured physical quantities into electrical quantities. Existing displacement sensors usually include a coil assembly, which includes an inner cylinder and a coil wound on the inner cylinder. In the actual production process, since the coil is difficult to be wound evenly on the inner cylinder, it is easy to cause the linearity of the coil assembly to exceed the specification requirements, resulting in deviations in the output voltage of the coil assembly, which eventually leads to the scrapping of the coil assembly. Summary of the invention

[0003] The object of the present invention is to provide a displacement sensor, aiming to solve the technical problem that the linearity of the coil assembly of the existing displacement sensor is difficult to meet the specification requirements, resulting in a high scrap rate.

[0004] The present invention is implemented as follows: a displacement sensor includes a coil assembly, an iron core arranged in the coil assembly and capable of axially moving relative to the coil assembly, and a compensation structure sleeved outside the coil assembly, wherein the compensation structure is used to hinder or enhance the magnetic field generated by the movement of the iron core relative to the coil assembly to compensate for the output voltage of the coil assembly.

[0005] In one embodiment, the compensation structure includes at least one first compensation member sleeved outside the coil assembly, and the first compensation member is used to reduce the output voltage of the coil assembly.

[0006] In one embodiment, the first compensating member is spirally wound outside the coil assembly, and two ends of the first compensating member are connected to each other.

[0007] In one embodiment, the first compensating member is an enameled wire.

[0008] In one embodiment, the first compensating member is an O-shaped sleeve.

[0009] In one embodiment, the coil assembly includes an inner cylinder and a coil wound around the inner cylinder; the iron core is disposed in the inner cylinder and can reciprocate along the axial direction of the inner cylinder.

[0010] In one embodiment, the displacement sensor further includes an outer cylinder sleeved outside the coil assembly, and the compensation structure is disposed between the outer cylinder and the coil assembly.

[0011] In one embodiment, the compensation structure includes at least one second compensation member sleeved outside the coil assembly, and the second compensation member is used to increase the output voltage of the coil assembly.

[0012] In one embodiment, the second compensating member is a C-shaped sleeve.

[0013] In one embodiment, the second compensating member is an iron-nickel alloy member.

[0014] In one embodiment, a notch is formed on the second compensating member along its circumference.

[0015] In one embodiment, the notch axially penetrates the second compensating member.

[0016] In one embodiment, the circumferential width of the notch is 0.1 mm to 2 mm.

[0017] The displacement sensor provided by the present invention comprises a coil assembly, an iron core arranged in the coil assembly and capable of axially moving relative to the coil assembly, and a compensation structure sleeved outside the coil assembly. The compensation structure is used to hinder or enhance the magnetic field generated by the movement of the iron core relative to the coil assembly to compensate for the output voltage of the coil assembly. In the actual production process, when the linearity of the coil assembly exceeds the specification requirements and the output voltage deviation is large, the compensation structure can be sleeved outside the coil assembly to compensate for the output voltage of the coil assembly, so that the linearity of the coil assembly meets the requirements, thereby reducing the scrap rate of the coil assembly, which can effectively improve production efficiency and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of a displacement sensor provided by an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the decomposed structure of a displacement sensor provided by an embodiment of the present invention;

[0021] Figure 3 is a schematic cross-sectional structural diagram of a displacement sensor provided by an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of a three-dimensional structure of a first compensation member provided by an embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of a three-dimensional structure of another first compensation member provided by an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of the three-dimensional structure of a second compensation member provided by an embodiment of the present invention;

[0025] Figure 7 It is a test chart of the linearity of the coil assembly of the displacement sensor according to the embodiment of the present invention.

[0026] Among them, the reference numerals in the figure are:

[0027] 100 - coil assembly, 110 - inner cylinder, 111 - hollow cavity, 120 - coil, 200 - iron core, 300 - compensation structure, 310a, 310b - first compensation piece, 320 - second compensation piece, 321 - notch, 400 - outer cylinder, 500 - end cover, 510 - central through hole, 600 - wire. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of this patent. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0030] In order to illustrate the technical solution of the present invention, a detailed description is given below in conjunction with specific drawings and embodiments.

[0031] See also Figures 1 to 3The embodiment of the present invention provides a displacement sensor, including a coil assembly 100, an iron core 200 disposed in the coil assembly 100 and capable of axially moving relative to the coil assembly 100, and a compensation structure 300 sleeved outside the coil assembly 100, the compensation structure 300 is used to hinder or enhance the magnetic field generated by the movement of the iron core 200 relative to the coil assembly 100 to compensate for the output voltage of the coil assembly 100. In the embodiment of the present invention, when the iron core 200 reciprocates along the axial direction of the coil assembly 100, the iron core 200 can effectively cut the magnetic flux lines of the coil assembly 100, and the coil assembly 100 generates a corresponding induced electromotive force, so that the coil assembly 100 generates an output voltage, and the magnitude of the output voltage depends on the magnitude of the displacement.

[0032] The displacement sensor of the embodiment of the present invention includes a coil assembly 100, an iron core 200 arranged in the coil assembly 100 and capable of reciprocating along the axial direction of the coil assembly 100, and a compensation structure 300 sleeved on the outside of the coil assembly 100. The compensation structure 300 is used to hinder or enhance the magnetic field generated by the movement of the iron core 200 relative to the coil assembly 100 to compensate for the output voltage of the coil assembly 100. In the actual production process, when the linearity of the coil assembly 100 exceeds the specification requirements and the output voltage deviation is large, the compensation structure 300 can be arranged outside the coil assembly 100 to compensate for the output voltage of the coil assembly 100, so that the linearity of the coil assembly 100 meets the requirements, thereby reducing the scrap rate of the coil assembly 100, which can effectively improve production efficiency and reduce production costs.

[0033] Specifically, in one embodiment of the present invention, the coil assembly 100 includes an inner cylinder 110, and a coil 120 wound on the inner cylinder 110; the iron core 200 is arranged in the inner cylinder 110 and can reciprocate along the axial direction of the inner cylinder 110. When the iron core 200 reciprocates along the axial direction of the inner cylinder 110, the iron core 200 can effectively cut the magnetic flux lines of the coil 120, and the coil 120 generates a corresponding induced electromotive force, so that the coil 120 generates an output voltage, and the magnitude of the output voltage depends on the magnitude of the displacement. In actual production, since it is difficult to evenly wind the coil 120 on the inner cylinder 110, the coil 120 may have a problem of being relatively densely or sparsely wound locally. For the area where the coil 120 is relatively densely wound, when the iron core 200 moves in the corresponding area, the output voltage of the coil 120 in the area will be relatively large; for the area where the coil 120 is relatively sparsely wound, when the iron core 200 moves in the corresponding area, the output voltage of the coil 120 in the area will be relatively small.

[0034] Specifically, in one embodiment of the present invention, Figures 2 to 5As shown, the compensation structure 300 includes at least one first compensation member 310a (or 310b) sleeved outside the coil assembly 100, and the first compensation member 310a (or 310b) is used to reduce the output voltage of the coil assembly 100. When the linearity of the coil assembly 100 exceeds the specification requirements and the output voltage is too large, the first compensation member 310a (or 310b) can be set in the area of ​​the coil assembly 100 corresponding to the large output voltage to reduce the output voltage, so as to make the linearity of the coil assembly 100 meet the requirements.

[0035] Alternatively, if Figures 2 to 4 As shown, the first compensating member 310a can be spirally wound outside the coil assembly 100, and the two ends of the first compensating member 310a are connected to each other. Under this structure, the first compensating member 310a can be used as a self-closing coil. When the iron core 200 reciprocates along the axial direction of the inner cylinder 110, the first compensating member 310a will generate eddy currents, thereby generating a magnetic field that hinders the coil 120, thereby reducing the output voltage of the coil 120. In this embodiment, the first compensating member 310a can be, but is not limited to, an enameled wire, which includes a conductor and an insulating layer wrapped outside the conductor.

[0036] Alternatively, if Figure 2 , Figure 3 and Figure 5 As shown, the first compensating member 310b can be an O-shaped sleeve sleeved outside the coil assembly 100. Under this structure, the first compensating member 310b can be used as a self-closed ring structure. When the iron core 200 reciprocates along the axial direction of the inner tube 110, the first compensating member 310b will generate eddy currents, thereby generating a magnetic field that hinders the generation of the coil 120, thereby reducing the output voltage of the coil 120.

[0037] Specifically, in one embodiment of the present invention, as 2, Figure 3 and Figure 6 As shown, the compensation structure 300 includes at least one second compensation member 320 sleeved outside the coil assembly 100, and the second compensation member 320 is used to increase the output voltage of the coil assembly 100. When the linearity of the coil assembly 100 exceeds the specification requirements and the output voltage is relatively small, the second compensation member 320 can be set in the area of ​​the coil assembly 100 corresponding to the relatively small output voltage to increase the output voltage, thereby making the linearity of the coil assembly 100 meet the requirements.

[0038] Furthermore, as 2, Figure 3 and Figure 6As shown, the second compensating member 320 is a C-shaped sleeve, and the second compensating member 320 is an iron-nickel alloy member with high magnetic permeability. The second compensating member 320 can be coupled with the coil 120 to enhance the magnetic field, thereby increasing the output voltage of the coil 120. In this embodiment, the axial length of the second compensating member 320 in the coil assembly 100 needs to be adjusted according to the original small output voltage of the coil 120, and the present invention is not limited thereto.

[0039] Furthermore, as 2, Figure 3 and Figure 6 As shown, a notch 321 is provided on the second compensation member 320 along its circumference, and the notch 321 axially penetrates the second compensation member 320 . The circumferential width of the notch 321 is 0.1 mm to 2 mm, so that the second compensation member 320 can be coupled with the coil 120 to enhance the magnetic field of the coil 120 and increase the output voltage of the coil 120 .

[0040] Specifically, in one embodiment of the present invention, the inner cylinder 110 is provided with a hollow cavity 111 along its axial direction, the iron core 200 is disposed in the hollow cavity 111, and the iron core 200 reciprocates along the axial direction of the inner cylinder 110. When the iron core 200 reciprocates along the axial direction of the inner cylinder 110 in the hollow cavity 111, the iron core 200 can effectively cut the magnetic flux lines of the coil 120, and the coil 120 generates a corresponding induced electromotive force, so that the coil 120 generates an output voltage, and the magnitude of the output voltage depends on the magnitude of the displacement.

[0041] Specifically, in one embodiment of the present invention, the displacement sensor further includes an outer cylinder 400 sleeved outside the coil assembly 100, and the compensation structure 300 is disposed between the outer cylinder 400 and the coil assembly 100. In this embodiment, the outer cylinder 400 mainly plays a protective and isolating role to prevent external factors from affecting the displacement measurement results.

[0042] Specifically, in one embodiment of the present invention, the displacement sensor further includes end caps 500 respectively disposed at both ends of the outer cylinder 400, and the coil assembly 100 is disposed between the two end caps 500. In this embodiment, the end caps 500 may be, but are not limited to, clamped at both ends of the outer cylinder 400, thereby restricting the coil assembly 100 within the outer cylinder 400.

[0043] Specifically, in one embodiment of the present invention, the displacement sensor further includes a wire 600, wherein a lead hole is opened on one of the end caps 500, and the wire 600 passes through the lead hole and is electrically connected to the coil assembly 100 (coil 120), thereby deriving the output voltage of the coil assembly 100.

[0044] Specifically, in one embodiment of the present invention, a central through hole 510 is opened on the end cover 500 corresponding to the iron core 200 to facilitate the connection of the iron core 200 with an external driving device, and the driving device is used to drive the iron core 200 to reciprocate in the hollow cavity 111 along the axial direction of the inner tube 110.

[0045] It is worth mentioning that Figure 7 This is a test diagram of the linearity of the coil assembly 100 of the displacement sensor according to an embodiment of the present invention. When the compensation structure 300 is not used, the linearity of the coil assembly 100 is poor. After the compensation structure 300 is used, the linearity of the coil assembly 100 is significantly improved.

[0046] The above descriptions are merely optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A displacement sensor, characterized in that: It includes a coil assembly, an iron core arranged in the coil assembly and capable of axially moving relative to the coil assembly, and a compensation structure sleeved outside the coil assembly, wherein the compensation structure is used to hinder or enhance the magnetic field generated by the movement of the iron core relative to the coil assembly to compensate for the output voltage of the coil assembly; the compensation structure includes at least one first compensation piece sleeved outside the coil assembly, and the first compensation piece is used to reduce the output voltage of the coil assembly; the first compensation piece is spirally wound outside the coil assembly, and the two ends of the first compensation piece are connected to each other; the compensation structure also includes at least one second compensation piece sleeved outside the coil assembly, and the second compensation piece is used to increase the output voltage of the coil assembly; the second compensation piece is a C-shaped sleeve; a notch is opened on the second compensation piece along its circumference.

2. The displacement sensor according to claim 1, characterized in that: The first compensation member is an enameled wire.

3. The displacement sensor according to claim 1, characterized in that: The first compensating member is an O-shaped sleeve.

4. The displacement sensor according to claim 1, characterized in that: The coil assembly comprises an inner cylinder and a coil wound on the inner cylinder; the iron core is arranged in the inner cylinder and can reciprocate along the axial direction of the inner cylinder.

5. The displacement sensor according to claim 1, characterized in that: The displacement sensor further comprises an outer cylinder sleeved outside the coil assembly, and the compensation structure is arranged between the outer cylinder and the coil assembly.

6. The displacement sensor according to claim 1, characterized in that: The second compensating member is an iron-nickel alloy member.

7. The displacement sensor according to claim 1, characterized in that: The notch axially penetrates the second compensating member.

8. The displacement sensor according to claim 1, characterized in that: The circumferential width of the notch is 0.1 mm to 2 mm.

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