Linear displacement sensor structural member

Abstract

The utility model discloses a linear displacement sensor structural member, which relates to the technical field of sensors and comprises an outer shell, a PCB (printed circuit board), a terminal, a conductive sliding block and a spring washer, the PCB is arranged in the outer shell, the terminal is arranged on the outer shell and connected with the PCB, an induction part is arranged on the PCB, the conductive sliding block is movably arranged at the lower end of the outer shell, and the spring washer is arranged on the conductive sliding block. A plurality of connecting parts are arranged on the outer wall of the outer shell, and a spring gasket is arranged on each connecting part. According to the utility model, through the arrangement of the conductive sliding block, a magnet or a magnetic mechanism is not needed, the cost can be effectively reduced, and the sensing part is arranged in the outer shell, so that the stray magnetic field resistance is stronger, and additional shielding measures are not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a linear displacement sensor structural component. Background Art

[0002] Linear sensors are currently the primary method for measuring the motion of vehicle systems. These conventional linear sensors consist of an outer housing, a circuit board mounted inside the housing, and a movable magnetic mechanism at the bottom of the housing. These sensors output analog or pulse-width modulated signals based on changes in the magnetic field to measure the system's motion. However, the exposed magnetic mechanism makes the magnetic field susceptible to external interference, requiring additional shielding measures and increasing costs. Utility Model Content

[0003] The purpose of the present utility model is to provide a linear displacement sensor structure to solve the above technical problems.

[0004] The technical solutions adopted in this utility model are as follows:

[0005] A linear displacement sensor structure includes an outer shell, a PCB, terminals, a conductive slider, and a spring washer. The PCB is disposed inside the outer shell, the terminals are disposed on the outer shell, and the terminals are connected to the PCB. The PCB is provided with a sensing portion. The conductive slider is movably disposed at the lower end of the outer shell. Several connecting portions are provided on the outer wall of the outer shell, and each of the connecting portions is provided with a spring washer.

[0006] Preferably, the outer shell includes a cover plate and a base, the cover plate is detachably arranged on the upper end of the base, a receiving cavity is formed between the cover plate and the base, and the PCB board is installed in the receiving cavity.

[0007] As a further preference, a plurality of buckles are provided on the outer peripheral wall of the cover plate, and a plurality of clamping blocks are provided on the outer peripheral wall of the base, and the clamping blocks cooperate with the buckles.

[0008] As a further preference, it further includes positioning posts, a plurality of said positioning posts are arranged inside the base, a plurality of positioning grooves are opened on the outer peripheral wall of the PCB board, and the said positioning posts cooperate with the said positioning grooves.

[0009] As a further preference, a plurality of arc-shaped limiting portions are provided on the inner peripheral wall of the base, and a plurality of arc-shaped notches are correspondingly provided on the outer peripheral wall of the PCB board.

[0010] As a further preference, a plurality of connecting parts are provided on the outer wall of the base, a connecting hole is provided in the middle of each connecting part, a groove is provided on the upper side of the connecting hole, the groove is connected to the connecting hole, and the spring gasket is provided in the groove.

[0011] As a further preference, an annular mounting groove is provided at the lower end of the base, a sealing ring is provided in the mounting groove, and a sliding groove is also provided at the lower end of the base, and the sliding groove is located on the inner side of the mounting groove.

[0012] As a further preference, the conductive slider includes a fixed seat and a sensing element arranged at the upper end of the fixed seat, the upper end of the fixed seat has protruding portions protruding upward on both sides, and the upper end of the fixed seat is provided with embedding grooves on both sides. The sensing element is arranged in a "U" shape, and the two ends of the sensing element are arranged in the two embedding grooves. The fixed seat can drive the sensing element to move in the sliding groove.

[0013] As a further preference, a mounting hole is provided in the middle of the lower end of the fixing seat, and a plurality of strip-shaped grooves are provided on the outer wall of the fixing seat, and the strip-shaped grooves are connected to the mounting hole.

[0014] Preferably, a PIN is further included, and the terminal is connected to the PCB board via the PIN.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the utility model, by setting the conductive slider, no magnet or magnetic mechanism is required, which can effectively reduce costs. The sensing part is set in the outer shell, which has a stronger ability to resist stray magnetic fields and does not require additional shielding measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an exploded schematic diagram of the structural components of the linear displacement sensor in the utility model;

[0018] Figure 2 This is an exploded schematic diagram of the conductive slider in the present utility model;

[0019] Figure 3 This is a schematic diagram of the design of the excitation coil in the present utility model;

[0020] Figure 4 This is a schematic diagram of the working principle of the excitation coil, receiving coil and conductive slider in the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the base in Example 2 Figure 1 ;

[0022] Figure 6This is a schematic diagram of the structure of the base in Example 2 Figure 2 .

[0023] In the figure: 1. outer shell; 101. cover plate; 102. base; 2. PCB board; 3. terminal; 4. conductive slider; 401. fixing seat; 402. sensing element; 403. protrusion; 404. embedding groove; 405. strip groove; 5. spring gasket; 601. buckle; 602. snap block; 603. positioning column; 7. limiting part; 8. connecting part; 9. mounting groove; 10. sealing ring; 11. slide groove; 12. PIN; 13. first mounting hole; 14. first mounting groove; 15. second mounting groove; 16. heat dissipation mechanism; 161. heat conducting plate; 162. first connecting plate; 163. second connecting plate; 164. heat dissipation fin; 17. excitation coil; 18. receiving coil. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like are used to indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of this utility model and to simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] Example 1

[0028] See Figures 1 to 4FIG. 1 shows a preferred embodiment of a linear displacement sensor structure, comprising a housing 1, a PCB 2 (printed circuit board), a terminal 3, a conductive slider 4, and a spring washer 5. The housing 1 houses the PCB 2, and the terminal 3 is disposed on the housing 1 and connected to the PCB 2. The PCB 2 is provided with a sensing portion. The conductive slider 4 is movably disposed at the lower end of the housing 1. Several connecting portions 8 are disposed on the outer wall of the housing 1, each of which is provided with a spring washer 5. In this embodiment, the sensing portion disposed on the PCB 2 includes a receiving coil 18 and an excitation coil 17, which are disposed at the lower end of the PCB 2. A processing circuit is also disposed at the upper end of the PCB 2 and connected to the receiving coil 18 and the excitation coil 17. The terminal 3 can be connected to the processing circuit via a pin 12. The excitation coil 17 generates a changing electromagnetic field, and the receiving coil 18 senses the position of the conductive slider 4 within the electromagnetic field. The conductive slider 4 is made of conductive material and generates eddy currents in the changing electromagnetic field, affecting the electromagnetic field in the coverage area. The receiving coil 18 converts the changes in the electromagnetic field into changes in the induced electromotive force, thereby sensing the position of the sensing element 402. The physical principle of eddy current is used to detect the position of the sensing element 402 moving above a set of coils.

[0029] The receiving coil 18, the exciting coil 17 and the processing circuit in this embodiment are all existing structures and will not be described in detail here. A mounting portion for mounting the terminal 3 is provided on one side of the upper end of the outer shell 1, and the terminal 3 is inserted into the mounting portion.

[0030] The connecting portion 8 can be connected to the external structure by means of bolts, and in conjunction with the arrangement of the spring washer 5, a certain pre-tightening force can be provided to avoid loose connection.

[0031] See also Figure 1 As shown, two terminals 3 are provided for connecting to external conductors for receiving or transmitting signals.

[0032] Furthermore, as a preferred embodiment, the outer shell 1 includes a cover 101 and a base 102. The cover 101 is detachably mounted on the upper end of the base 102. A receiving cavity is formed between the cover 101 and the base 102, and the PCB 2 is installed in the receiving cavity. A plurality of clips 601 are provided on the outer peripheral wall of the cover 101, and a plurality of snap-in blocks 602 are provided on the outer peripheral wall of the base 102. The snap-in blocks 602 cooperate with the clips 601 and can be inserted into the clips 601 to facilitate the connection between the cover 101 and the base 102. The snap-in connection between the cover 101 and the base 102 facilitates installation or removal of the cover 101 and the base 102.

[0033] Furthermore, as a preferred embodiment, the base 102 further includes positioning posts 603. Several positioning posts 603 are disposed within the base 102, and several positioning slots are formed on the outer peripheral wall of the PCB board 2. The positioning posts 603 cooperate with the positioning slots. The positioning posts 603 are integrally connected to the lower inner wall of the base 102. The positioning posts 603 cooperate with the positioning slots to facilitate positioning of the PCB board 2, preventing it from shaking. Furthermore, in conjunction with the cover 101, the cover 101 can press down on the PCB board 2, securing it within the accommodating cavity formed by the cover 101 and the base 102.

[0034] Furthermore, as a preferred embodiment, a plurality of arc-shaped limiting portions 7 are provided on the inner peripheral wall of the base 102, and a plurality of arc-shaped notches are correspondingly provided on the outer peripheral wall of the PCB board 2. Figure 1 As shown, the limiting portion 7 is used to cooperate with the notch on the PCB board 2. The limiting portion 7 can enter the notch to fix the position of the PCB board 2 and ensure the stability of the installation of the PCB board 2.

[0035] Furthermore, as a preferred embodiment, a plurality of connecting portions 8 are provided on the outer wall of the base 102. Each connecting portion 8 has a connecting hole in the middle, and a groove is provided above the connecting hole. The groove is connected to the connecting hole, and the spring washer 5 is disposed within the groove. The connecting portion 8 is integrally formed with the base 102, with the connecting hole extending therethrough. The groove is coaxially arranged and connected to the connecting hole. The spring washer 5 is installed in the groove. During installation, a bolt is passed through the spring washer 5 and the connecting hole to connect to the external structure.

[0036] Furthermore, as a preferred embodiment, an annular mounting groove 9 is formed at the lower end of the base 102, and a sealing ring 10 is disposed in the mounting groove 9. A sliding groove 11 is also formed at the lower end of the base 102, and the sliding groove 11 is located inside the mounting groove 9. The sealing ring 10 is provided to seal between the base 102 and the external structure, and the sealing ring 10 at least partially extends out of the mounting groove 9. The sealing ring 10 can contact the external structural parts, and can play a buffering role when the base 102 vibrates.

[0037] Furthermore, as a preferred embodiment, the conductive slider 4 includes a fixing base 401 and a sensing element 402 disposed at the upper end of the fixing base 401. The fixing base 401 has upwardly projecting protrusions 403 on both sides of its upper end. The fixing base 401 has recesses 404 on both sides of its upper end. The sensing element 402 is arranged in a "U" shape, with both ends of the sensing element 402 disposed within the recesses 404. The fixing base 401 is capable of driving the sensing element 402 to move within the slide 11. The fixing base 401 and the sensing element 402 are detachably connected. The sensing element 402 can be made of a conductive material and generate voltage when energized. The sensing element 402 cooperates with the recesses 404 to enable removal of the sensing element 402 for easy replacement. The two protrusions 403 can limit the position of the sensing element 402, and when the sensing element 402 is installed in the embedding groove 404, the sensing element 402 can be flush with the upper ends of the two protrusions 403, which can prevent the sensing element 402 from colliding with the inner wall of the sliding groove 11, thereby protecting the sensing element 402.

[0038] Furthermore, as a preferred embodiment, a mounting hole is provided in the middle of the lower end of the fixing base 401, and a plurality of strip grooves 405 are provided on the outer wall of the fixing base 401, and the strip grooves 405 are connected to the mounting hole. Figure 2 As shown, the strip groove 405 is arranged along the axial direction of the mounting hole, so that the inner diameter of the mounting hole has a certain expansion space, which is convenient for connecting with the external moving part to be measured, and the fixed seat 401 and the sensing element 402 are driven to move in the slide groove 11 by the moving part to be measured.

[0039] Furthermore, as a preferred embodiment, it also includes PIN12, and the terminal 3 is connected to the PCB board 2 through PIN12.

[0040] The linear displacement sensor structure of this embodiment can be used in automotive, industrial, medical and consumer applications. The working principle diagram of the excitation coil 17 and the receiving coil 18 can be found in Figure 4 shown.

[0041] In this embodiment, sensing element 402 is made of a conductive material and can be any type of metal, such as aluminum, steel, or a PCB with a printed copper layer. Eddy currents are generated in the alternating magnetic field of excitation coil 17. These eddy currents always prevent the alternating magnetic field of excitation coil 17 from penetrating sensing element 402. Furthermore, in the portion covered by sensing element 402, the magnetic field lines perpendicular to the plane of sensing element 402 are weakened. The magnetic field amplitude in the portion covered by sensing element 402 is smaller than the magnetic field amplitude in the portion not covered by sensing element 402, resulting in an amplitude step. The magnetic field amplitudes in the covered and uncovered portions are inconsistent, disrupting the uniform alternating magnetic field of excitation coil 17. This amplitude step can be sensed by receiving coil 18, thereby sensing the position of the rotor (the moving component being measured). Receiving coil 18 does not generate an induced voltage in a uniform alternating magnetic field, but generates an induced voltage in the amplitude step. The receiving coil is composed of an even number of radially symmetrical polar coils wound around a single wire, with adjacent polar coils having opposite polarity. This means that no voltage is induced in the polar coils in a uniform alternating magnetic field, and ultimately, no induced electromotive force is generated in the receiving coil 18. However, the addition of inductive element 402 disrupts this stable magnetic field, creating an amplitude step. This results in inconsistent magnetic flux in the oppositely polarized coils of receiving coil 18, and the resulting induced electromotive forces do not cancel each other out. Furthermore, the induced electromotive force in receiving coil 18 varies with the position of inductive element 402. By demodulating and processing the induced electromotive force from receiving coil 18, a position signal of inductive element 402 on the coil can be obtained.

[0042] In this embodiment, the excitation coil 17 and the receiving coil 18 are printed on the PCB board 2 .

[0043] Example 2

[0044] See also Figure 5-6 As shown, the difference between this embodiment 2 and embodiment 1 is that a heat dissipation mechanism 16 is added on the basis of embodiment 1. Figure 5As shown, two first mounting holes 13 are provided on each side wall of the base 102. A first mounting groove 14 is provided between the two first mounting holes 13. The first mounting groove 14 communicates with the two first mounting holes 13. A second mounting groove 15 is provided on the side away from each other of the two first mounting holes 13. The depth of the first mounting groove 14 and the depth of the second mounting groove 15 are both less than the depth of the first mounting holes 13. The heat dissipation mechanism 16 includes two U-shaped heat conducting plates 161. The two heat conducting plates 161 are connected by a first connecting plate 162. A second connecting plate 163 is provided on the end away from each other of the two heat conducting plates 161. A plurality of heat dissipating fins 164 are provided on the inner wall of the heat conducting plates 161. The first connecting plate 162, the heat conducting plate 161, the heat dissipating fins 164, and the second heat conducting plate 161 are integrally formed. During use, the two thermally conductive sheets 161 are installed within the two first mounting holes 13. At this point, the thermally conductive sheets 161 extend into the interior of the base 102, leaving a gap between them and the PCB 2. However, near the PCB 2, the first connecting sheet 162 engages within the first mounting slot 14, and the two second connecting sheets 163 engage within the two second mounting slots 15, completing the installation of the heat dissipation mechanism 16. After installation, the heat dissipation fins 164 of the heat dissipation mechanism 16 have a gap with the plane of the sidewalls of the base 102. This means that the heat dissipation fins 164 are hidden within the first mounting holes 13 and do not protrude from them, preventing contact with the heat dissipation fins 164. The first connecting sheet 162 and the second connecting sheet 163 do not conduct heat. During use, the thermally conductive sheets 161 quickly dissipate heat from within the outer housing 1, preventing the internal temperature of the outer housing 1 from rising and affecting the service life of the PCB 2.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the implementation method and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A linear displacement sensor structure, characterized in that: The invention comprises an outer shell, a PCB board, a terminal, a conductive slider and a spring washer. The PCB board is arranged inside the outer shell, the terminal is arranged on the outer shell, the terminal is connected to the PCB board, the PCB board is provided with a sensing part, the conductive slider is movably provided at the lower end of the outer shell, and a plurality of connecting parts are provided on the outer wall of the outer shell, and each of the connecting parts is provided with a spring washer.

2. The linear displacement sensor structure according to claim 1, wherein: The outer shell includes a cover plate and a base. The cover plate is detachably arranged on the upper end of the base. A receiving cavity is formed between the cover plate and the base. The PCB board is installed in the receiving cavity.

3. The linear displacement sensor structure according to claim 2, wherein: A plurality of buckles are provided on the outer peripheral wall of the cover plate, and a plurality of clamping blocks are provided on the outer peripheral wall of the base, and the clamping blocks cooperate with the buckles.

4. The linear displacement sensor structure according to claim 2, wherein: It also includes positioning posts. A plurality of positioning posts are arranged inside the base. A plurality of positioning grooves are opened on the outer peripheral wall of the PCB board. The positioning posts cooperate with the positioning grooves.

5. The linear displacement sensor structure according to claim 2, wherein: A plurality of arc-shaped limiting portions are provided on the inner peripheral wall of the base, and a plurality of arc-shaped notches are correspondingly provided on the outer peripheral wall of the PCB board.

6. The linear displacement sensor structure according to claim 2, wherein: A plurality of connecting parts are provided on the outer wall of the base, a connecting hole is respectively provided in the middle of each connecting part, a groove is provided on the upper side of the connecting hole, the groove is communicated with the connecting hole, and the spring washer is provided in the groove.

7. The linear displacement sensor structure according to claim 2, wherein: An annular mounting groove is provided at the lower end of the base, a sealing ring is provided in the mounting groove, and a sliding groove is further provided at the lower end of the base, the sliding groove being located on the inner side of the mounting groove.

8. The linear displacement sensor structure according to claim 7, wherein: The conductive slider includes a fixed seat and a sensing element arranged at the upper end of the fixed seat. The upper end of the fixed seat has protruding portions protruding upward on both sides. The upper end of the fixed seat is provided with embedding grooves on both sides. The sensing element is arranged in a "U" shape, and the two ends of the sensing element are arranged in the two embedding grooves. The fixed seat can drive the sensing element to move in the sliding groove.

9. The linear displacement sensor structure according to claim 8, wherein: A mounting hole is provided in the middle of the lower end of the fixing seat, and a plurality of strip-shaped grooves are provided on the outer wall of the fixing seat, and the strip-shaped grooves are communicated with the mounting hole.

10. The linear displacement sensor structure according to claim 1, wherein: It also includes a PIN, and the terminal is connected to the PCB board through the PIN.

Images