CN219495116U

CN219495116U - Low temperature resistant displacement sensor

Info

Publication number: CN219495116U
Application number: CN202320903067.0U
Authority: CN
Inventors: 王朋成; 余来
Original assignee: Beijing Abeke Sensor Technology Co ltd
Current assignee: Beijing Abeke Sensor Technology Co ltd
Priority date: 2023-04-20
Filing date: 2023-04-20
Publication date: 2023-08-08
Anticipated expiration: 2033-04-20

Abstract

The application relates to a low temperature resistant displacement sensor, including: the coil assembly comprises a shell, a coil assembly, a first heat insulation layer, an iron core and a wire; the outer shell is sleeved with a coil group, the coil group is sleeved with a first heat preservation layer, and the first heat preservation layer is sleeved with an iron core; the coil assembly is provided with a second heat-insulating layer, and the second heat-insulating layer is sleeved with the coil assembly; the wire is connected with the coil group, and the wire is equipped with the third heat preservation, and the wire setting is established to the third heat preservation cover. The application is applicable to improving the cold resistance of a Linear Variable Differential Transformer (LVDT) displacement sensor, the iron core is sleeved on the first heat preservation layer, the coil assembly is sleeved on the second heat preservation layer, the cold resistance of the iron core and the coil assembly in the working state can be improved, and the working state of a lead under low temperature can be guaranteed by the third heat preservation layer.

Description

Low temperature resistant displacement sensor

Technical Field

The application relates to the technical field of testing, in particular to a low-temperature-resistant displacement sensor.

Background

A Linear Variable Differential Transformer (LVDT) type displacement sensor, which can convert the mechanical variation of linear motion of an object into corresponding electronic signals, is composed of a primary coil, two secondary coils, an iron core, a shell and the like. When the core is in the center of the coil, the voltages induced by the secondary coils S1, S2 are equal, and the output voltage is zero (in practice, there is a small zero voltage V0) because the outputs are connected in reverse series. When the iron core moves rightwards, the algebraic sum of the voltage changes of the two coils, corresponding to the voltage changes of the two coils, of V1 and V2, is linearly increased along with the rightwards movement of the iron core, but the phase is 180 degrees different from the leftwards movement, and the relation between the secondary voltage and the distance of the iron core is the output characteristic. Thus, the non-electric quantity-displacement is converted into voltage, and the function of the sensor is completed.

Linear Variable Differential Transformer (LVDT) displacement sensors are often used in a variety of engineering applications to measure accurate data such as elongation, vibration frequency, amplitude, thickness and expansion of an object. However, along with the needs of engineering construction and human fixation, a large amount of engineering needs to be carried out in a low-temperature environment, whether an indoor test or on-site monitoring is carried out, the instrument is in a high-cold environment for a long time, and at the moment, the working efficiency of the instrument is greatly influenced by the cold resistance of the instrument. At present, the Linear Variable Differential Transformer (LVDT) type displacement sensor has few cold-resistant measures adopted in a high-temperature and high-cold environment, for example, the LVDT type displacement sensor and the automobile load measuring system disclosed in patent number 201420145413.4 only adopt a dust cover to ensure that the sensor is not interfered by dust.

How to improve the high and cold resistance of a Linear Variable Differential Transformer (LVDT) displacement sensor is a problem to be solved by those skilled in the art.

Disclosure of Invention

In view of this, the present application proposes a low temperature resistant displacement sensor suitable for improving the cold resistance of a Linear Variable Differential Transformer (LVDT) displacement sensor.

According to an aspect of the present application, there is provided a low temperature resistant displacement sensor, comprising: the coil assembly comprises a shell, a coil assembly, a first heat insulation layer, an iron core and a wire;

the outer shell is sleeved with a coil group, the coil group is sleeved with a first heat preservation layer, and the first heat preservation layer is sleeved with an iron core;

the coil assembly is provided with a second heat-insulating layer, and the second heat-insulating layer is sleeved with the coil assembly;

the wire is connected with the coil group, and the wire is equipped with the third heat preservation, and the wire setting is established to the third heat preservation cover.

In one possible implementation, the coil set includes a first secondary coil and a second secondary coil;

the first secondary coil is arranged adjacent to the second secondary coil;

the second heat preservation is equipped with two, and two second heat preservation overlaps respectively and establishes first secondary coil and second secondary coil setting.

In one possible implementation, the first thermal insulation layer is provided with a fixing portion;

the fixed part is provided with an opening cylinder structure, and one end of the first heat preservation layer is sleeved on the fixed part.

In one possible implementation, one side of the fixing portion is connected to the first heat-preserving layer, and the other side of the first fixing portion abuts against the housing.

In one possible implementation, two fixing portions are provided, and the two fixing portions are respectively disposed at opposite ends of the first heat-preserving layer.

In one possible implementation, the housing is provided with a first upper cover and a second upper cover;

the first upper cover and the second upper cover are oppositely arranged on two opposite sides of the shell, and the first upper cover is provided with a wire guide.

In one possible implementation, the first heat-retaining material is polyetheretherketone.

In one possible implementation manner, the material of the second heat-insulating layer and the material of the third heat-insulating layer are both polyimide.

In one possible implementation, the device further comprises a magnetic conductive shell;

the magnetic conduction shell is sleeved on the outer side wall of the second heat preservation layer.

The application is applicable to improving the cold resistance of a Linear Variable Differential Transformer (LVDT) displacement sensor, the iron core is sleeved on the first heat preservation layer, the coil assembly is sleeved on the second heat preservation layer, the cold resistance of the iron core and the coil assembly in the working state can be improved, and the working state of a lead under low temperature can be guaranteed by the third heat preservation layer.

Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the present application and together with the description, serve to explain the principles of the present application.

Fig. 1 shows a cross-sectional view of a low temperature resistant displacement sensor according to an embodiment of the present application.

Detailed Description

Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

It should be understood, however, that the terms "center," "longitudinal," "transverse," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the utility model or simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

In addition, numerous specific details are set forth in the following detailed description in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements, and circuits have not been described in detail as not to unnecessarily obscure the present application.

Fig. 1 shows a cross-sectional view of a low temperature resistant displacement sensor according to an embodiment of the present application. As shown in fig. 1, the low temperature resistant displacement sensor includes: the coil assembly comprises a housing 100, a coil assembly 210, a first heat-preserving layer 200, an iron core 400 and a wire 500; the shell 100 is sleeved with the coil group 210, the coil group 210 is sleeved with the first heat preservation layer 200, and the first heat preservation layer 200 is sleeved with the iron core 400; the coil assembly 210 is provided with a second heat insulation layer 300, and the second heat insulation layer 300 is sleeved with the coil assembly 210; the wire 500 is connected with the coil assembly 210, the wire 500 is provided with a third heat insulation layer, and the third heat insulation layer is sleeved with the wire 500.

The application is suitable for improving the cold resistance of a Linear Variable Differential Transformer (LVDT) displacement sensor, the iron core 400 is sleeved on the first heat preservation layer 200, the coil group 210 is sleeved on the second heat preservation layer 300, the cold resistance of the iron core 400 and the coil group 210 in a working state can be improved, meanwhile, the coil group 210 is easy to deform or even break in an extremely low temperature environment, and the second heat preservation layer 300 can protect and prevent the coil group 210, so that the working reliability of the coil group 210 is improved. The first insulation layer 200 can ensure the moving accuracy of the core 400, and the third insulation layer can ensure the working state of the wire 500 at low temperature. If the low temperature displacement sensor works in extremely low temperature liquid, the first heat preservation layer 200, the second heat preservation layer 300 and the third heat preservation layer can also play roles of isolation and protection.

In one possible implementation, the coil assembly 210 includes a first secondary coil and a second secondary coil; the two second heat preservation layers 300 are arranged, the first secondary coil and the second secondary coil are respectively sleeved on the two second heat preservation layers 300, and the two heat preservation layers are adjacently arranged. Further, the coil set 210 further includes a primary coil, where the primary coil is sleeved with a first secondary coil and a second secondary coil, and the first secondary coil is disposed adjacent to the second secondary coil. Polyimide is adopted as the material of the primary coil, the first secondary coil and the second secondary coil.

In one possible implementation, the first thermal insulation layer 200 is provided with a fixing portion 310; the fixing portion 310 is a cylindrical structure with an opening, and one end of the first heat-preserving layer 200 is sleeved on the fixing portion 310. Here, it should be noted that, the first heat-preserving layer 200 is a hollow cylindrical structure, the primary coil is wound on the first heat-preserving layer 200, the fixing portion 310 is suitable for being disposed between the first heat-preserving layer 200 and the housing 100, and can play a role in supporting the housing 100, and can prevent the housing 100 from deformation under low temperature conditions, so as to ensure that the components inside the housing 100 are not worn and affected.

In one possible implementation, one side of the fixing portion 310 is connected to the first heat preservation layer 200, and the other side of the fixing portion 310 is disposed against the case 100. The fixing portion 310 has a hollow disc structure, the inner side wall of the fixing portion 310 is matched with the outer side wall of the first heat preservation layer 200, and the fixing portion 310 is sleeved at one end of the first heat preservation layer 200.

In one possible implementation, two fixing portions 310 are provided, and two fixing portions 310 are provided at opposite ends of the first heat preservation layer 200, respectively. Here, it should be noted that one of the fixing portions 310 is provided with a second wire guide; the wire guide hole of the first upper cover is arranged corresponding to the position of the second wire guide hole. Both the wire guide and the second wire guide are adapted to penetrate the wire 500. Further, silver-plated copper wires are selected as the material of the conductive wires 500.

The number of the wires 500 is more than two, the wires 500 are all provided with a third heat insulation layer, and the wires 500 are respectively connected with the primary coil, the first secondary coil and the second secondary coil.

In one possible implementation, the material of the first thermal insulation layer 200 is polyetheretherketone. The polyether-ether-ketone has high mechanical strength, low temperature resistance, irradiation resistance and good electrical property, and can ensure the insulation property and cold resistance of the wire 500 when immersed in a low-temperature medium.

In one possible implementation, the material of the second thermal insulation layer 300 and the material of the third thermal insulation layer are both polyimide. Further, the second heat-insulating layer 300 and the third heat-insulating layer are both polyimide films, the second heat-insulating layer 300 is tightly wrapped on the surface of the coil assembly 210, the third heat-insulating layer is tightly wrapped on the surface of the wire 500, the polyimide has low heat conductivity index, has strong low temperature resistance, and can resist low temperature of-196 ℃.

In one possible implementation, the housing 100 is provided with a first upper cover and a second upper cover; the first upper cover and the second upper cover are oppositely arranged at two opposite sides of the shell 100, and the first upper cover is provided with a wire guide. Here, it should be noted that the first upper cover is a disc structure, the housing 100 is a hollow cylinder structure, the first upper cover is matched with a port of the housing 100, the first upper cover is detachably connected with the housing 100, and the wire guide is suitable for the wire 500 to pass out of the housing 100. The second upper cover has a disk structure provided with openings, the end surfaces of which are concentric rings, the openings are provided in the middle of the second upper cover, and the testing device 700 is inserted into the openings to be connected with the iron core 400.

In one possible implementation, the device further comprises a magnetically permeable shell 600; the magnetic conductive shell 600 is sleeved on the outer sidewall of the second insulation layer 300. The magnetic conductive shell 600 is a hollow cylinder structure, and has the function of further protecting and isolating the second insulating layer 300 and the coil assembly 210.

In one possible implementation, the device further comprises a testing device 700; further, the test device 700 is a test stick.

The outer shell 100 is a hollow tube, the first insulating layer 200 is a hollow tube, and the magnetic conductive shell is a hollow tube. The first heat-insulating layer 200 is coaxially installed inside the magnetically permeable shell, which is coaxially installed inside the housing. The fixed part 310 at two ends of the first heat preservation 200 contacts and supports the shell 100, the coil group 210 is sleeved on the outer wall of the first heat preservation 200, further, the primary coil is sleeved on the outer wall of the first heat preservation 200, the first secondary coil and the second secondary coil are adjacently arranged, the first secondary coil and the second secondary coil are attached and sleeved on the outer wall of the primary coil side by side, the iron core 400 penetrates into the first heat preservation 200, one end of the iron core 400 is connected with the testing device 700, one end of the testing device 700 is connected with the iron core 400, and the other end of the testing device 700 penetrates through the through hole of the testing device 700 to protrude out of the shell.

When the core 400 of a Linear Variable Differential Transformer (LVDT) displacement sensor is in the center of the coil, the voltages induced by the secondary coil are equal, and the output voltage is zero (in practice, there is a small zero voltage V0) because the output is in reverse series. When the core 400 moves to the right, the algebraic sum of the two coil voltage changes corresponding to the opposite v1+v2 increases linearly with the movement of the core 400 to the right, but the phase is 180 ° different from the movement to the left, and the relationship between the secondary voltage and the distance of the core 400, namely the output characteristic. Thus, the non-electric quantity-displacement is converted into voltage, and the function of the sensor is completed.

The embodiments of the present application have been described above, the foregoing description is exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A low temperature displacement sensor, comprising: the coil assembly comprises a shell, a coil assembly, a first heat insulation layer, an iron core and a wire;

the outer shell is sleeved with the coil assembly, the coil assembly is sleeved with the first heat insulation layer, and the first heat insulation layer is sleeved with the iron core;

the wire is connected with the coil assembly, the wire is provided with a third heat insulation layer, and the third heat insulation layer is sleeved with the wire.

2. The low temperature resistant displacement sensor of claim 1, wherein the coil set comprises a first secondary coil and a second secondary coil;

the first secondary coil is arranged adjacent to the second secondary coil;

the second heat preservation is equipped with two, two the second heat preservation overlaps respectively establish first secondary coil with the setting of second secondary coil.

3. The low temperature resistant displacement sensor according to claim 1, wherein the first heat insulating layer is provided with a fixing portion;

the fixed part is of a cylindrical structure with an opening, and one end of the first heat preservation layer is sleeved on the fixed part.

4. The low temperature resistant displacement sensor according to claim 3, wherein one side of the fixing portion is connected to the first heat insulating layer, and the other side of the fixing portion abuts against the housing.

5. The low temperature resistant displacement sensor according to claim 4, wherein two of the fixing portions are provided, and the two fixing portions are provided at opposite ends of the first heat insulating layer, respectively.

6. The low temperature resistant displacement sensor of claim 1, wherein the housing is provided with a first upper cover and a second upper cover;

7. The low temperature resistant displacement sensor of claim 1, wherein the first thermal insulation layer is polyetheretherketone.

8. The low temperature resistant displacement sensor of claim 1, wherein the material of the second thermal insulation layer and the material of the third thermal insulation layer are both polyimide.

9. The low temperature resistant displacement sensor of claim 1, further comprising a magnetically permeable shell;