Anti-interference vibration impact composite sensor

Abstract

The utility model discloses an anti-interference vibration and impact composite sensor, which comprises a shell, a circuit board and a cable, an accommodating cavity is formed in the shell, the circuit board is embedded in the accommodating cavity, a vibration and impact sensitive chip is connected onto the circuit board, and one end of the cable penetrates through the shell, enters the accommodating cavity and is connected with a circuit on the circuit board. Compared with the prior art, the anti-interference vibration and impact composite sensor does not adopt a traditional secondary system with a complex structure as a sensitive source any more, the vibration and impact sensitive chip is adopted as the sensitive source, an assembly structure matched with the sensitive chip is designed, and the sensor with the assembly structure is simple in structure, convenient in process and high in anti-interference capability.

Description

Technical Field

[0001] The present application relates to the technical field of vibration and shock detection, and in particular to an anti-interference vibration and shock composite sensor. Background Art

[0002] Motor equipment has high speed and heavy load. To ensure the healthy operation of mechanical equipment, a vibration monitoring system is usually installed to monitor the vibration of the equipment during operation and evaluate the health status of gears, bearings and other operating equipment.

[0003] The commonly used solution at present is to install vibration sensors to monitor vibration acceleration and perform diagnostic evaluation in the airborne system. However, the vibration sensors on the market are usually in the form of piezoelectric chips, which require the construction of a second-order system, with complex structure and high process requirements. In addition, the electromagnetic field environment inside the motor is complex, and the sensor is easily affected by electromagnetic interference, which affects the authenticity of the sensor signal.

[0004] In summary, how to provide a structure that meets the product requirements of the motor industry and solves the problems of traditional vibration sensors, such as complex structure, high process requirements, high assembly difficulty, and signals that are easily interfered by electromagnetic fields, is an urgent problem to be solved by technical personnel in this field. Utility Model Content

[0005] In order to solve the above technical problems, the purpose of the utility model is to provide an anti-interference vibration impact composite sensor with strong anti-interference ability.

[0006] The technical solution provided by the utility model is as follows:

[0007] An anti-interference vibration and impact composite sensor comprises a shell, a circuit board, and a cable. A receiving cavity is formed inside the shell, the circuit board is embedded in the receiving cavity, a vibration and impact sensitive chip is connected to the circuit board, and one end of the cable passes through the shell into the receiving cavity and is connected to the circuit on the circuit board.

[0008] Preferably, it further comprises a shielding ring, which surrounds the circuit board and maintains an insulation distance from the inner wall of the shell.

[0009] Preferably, stoppers for positioning the shielding ring are provided on the upper portions of both side edges of the circuit board.

[0010] Preferably, first protrusions for maintaining an insulating distance between the shielding ring and the inner wall of the shell are respectively provided on both side edges of the circuit board above the stopper.

[0011] Preferably, a second protrusion is provided in the middle of the lower end of the circuit board, and a positioning groove is correspondingly provided on the inner bottom wall of the shell, so that the second protrusion is inserted into the positioning groove to position the circuit board during assembly.

[0012] Preferably, a clearance groove for inserting the front end of the cable is provided in the middle of the top of the circuit board.

[0013] Preferably, the shielding ring is connected to a signal ground on a circuit board.

[0014] Preferably, a filler is further included, and the filler is located in the accommodating cavity and is used to fill the gap between the circuit board and the inner wall of the shell.

[0015] Preferably, the shell includes a base and a pressure cover, the base is a cavity with an open end, and the pressure cover is fixed to the open end of the base.

[0016] Preferably, the outer edge of the gland is annular, and a positioning step is provided at the outer edge corresponding to the inner side wall of the base, so that the outer edge of the gland abuts against the positioning step to position the gland during assembly; the outer edge of the gland and the corresponding inner side wall of the base are interference fit and welded together.

[0017] Preferably, the pressure cover includes a cover body, a limiting ring, and a cable fixing cylinder. The limiting ring is located below the cover body and is provided with an opening for inserting a circuit board to clamp and fix the circuit board. The cable fixing cylinder is located above the cover body and is provided with a cylinder hole in the center for the cable to pass through. The cable fixing cylinder can be squeezed and deformed to hold the cable tightly.

[0018] Preferably, the cover body is provided with a receiving groove with a bottom opening, and the anti-interference vibration and impact composite sensor also includes a rubber plug, which is step-shaped and has a through hole in the middle, the wider part of the rubber plug is accommodated in the receiving groove, and the narrower part extends into the barrel hole, and the through hole is used for the cable to pass through, and the cable is pressed tightly by the rubber plug cooperating with the receiving groove wall and the barrel hole wall.

[0019] Preferably, a stud is provided at the lower portion of the base.

[0020] Preferably, the cable includes, from inside to outside, a positive core wire, a plastic insulating sheet, a signal ground metal shielding layer, a plastic insulating layer, a suspended shielding layer, and a wire protection sleeve.

[0021] Compared with the prior art, the utility model anti-interference vibration and shock composite sensor no longer uses the traditional complex structure of the secondary system as the sensitive source, but uses a vibration and shock sensitive chip as the sensitive source, and designs an assembly structure compatible with the sensitive chip. The sensor structure of this assembly structure is simple, the process is convenient, and the anti-interference ability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, 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 recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A three-dimensional diagram of an anti-interference vibration and impact composite sensor according to an embodiment of the utility model;

[0024] Figure 2 for Figure 1 A cross-sectional view of the anti-interference vibration and shock composite sensor shown;

[0025] Figure 3 for Figure 1 A cross-sectional view of the anti-interference vibration and shock composite sensor from another angle;

[0026] Figure 4 for Figure 1 A three-dimensional diagram of the base in the anti-interference vibration and shock composite sensor shown;

[0027] Figure 5 for Figure 1 A three-dimensional diagram of the gland in the anti-interference vibration and shock composite sensor shown;

[0028] Figure 6 for Figure 1 A three-dimensional diagram of a circuit board in the anti-interference vibration and shock composite sensor shown;

[0029] Figure 7 for Figure 1 A three-dimensional diagram of a circuit board and a shielding cover in the anti-interference vibration and shock composite sensor shown;

[0030] Figure 8 for Figure 1 A three-dimensional view of the rubber stopper in the anti-interference vibration and shock composite sensor shown. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0035] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0036] like Figures 1 to 8 As shown, an embodiment of the utility model provides an anti-interference vibration and impact composite sensor, including a housing 1, a rubber plug 2, a circuit board 3, a shielding ring 4, and a cable 5.

[0037] like Figures 2 to 4 As shown, in this embodiment, the housing 1 includes a base 11 and a pressure cover 12. The base 11 is a cavity with an open end, and the pressure cover 12 is fixed to the open end of the base 11 to form a receiving cavity for receiving the circuit board 3.

[0038] like Figures 1 to 4 As shown, in this embodiment, a stud 111 is provided at the bottom of the base 11, which has a thread for easy installation and fastening on the monitored object. A positioning groove 112 is provided in the middle of the inner bottom wall of the base 11, and a positioning step 113 is provided at the upper part of the inner side wall.

[0039] like Figures 1 to 3 and Figure 5 As shown, in this embodiment, the outer edge of the gland 12 is annular. During assembly, the outer edge of the gland abuts against the positioning step of the base to position the gland. The outer edge of the gland and the corresponding inner wall of the base are interference fit and welded together.

[0040] In this embodiment, the gland 12 includes a cover body 121, a limiting ring 122, and a cable fixing barrel 123. The limiting ring 122 is located below the cover body 121, and is provided with two openings 1221 for inserting the circuit board 3 to clamp and fix the circuit board 3. The cable fixing barrel 123 is located above the cover body 121, and is provided with a barrel hole 1231 in the center for the cable 5 to pass through. The cable fixing barrel 123 can be squeezed and deformed to hold the cable 5. In the actual process, after the cable is assembled, the cable fixing barrel 123 will be clamped with a wire clamp to allow the cable fixing barrel 123 to deform and hold the cable 5. The cover body 121 is provided with a receiving groove 1211 with a bottom opening for accommodating the rubber plug 2. The rubber plug 2 is in a step shape, and is provided with a through hole 21 in the middle for the cable 5 to pass through. After assembly, the wider part of the rubber plug 2 is accommodated in the accommodating groove 1211, and the narrower part extends into the barrel hole 1231. The rubber plug 2 cooperates with the accommodating groove wall and the barrel hole wall to press the cable 5 to limit its movement and prevent the core wire from loosening. At the same time, the rubber plug is used to ensure the waterproofness of the sensor and the insulation between the cable core wire and the gland.

[0041] like Figure 2 , Figure 3 , Figure 6 As shown, in this embodiment, the circuit board 3 is embedded in the housing cavity of the shell, and a vibration impact sensitive chip (MEMS chip, i.e., micro-electromechanical system chip, not shown) can be welded and connected thereto as a sensitive source. One end of the cable 5 passes through the shell 1 into the housing cavity, and is welded and connected to the circuit on the circuit board 3 (not shown), so that the vibration impact signal collected by the MEMS chip is transmitted to the external processing device through the cable via the circuit on the circuit board. Depending on the selected sensitive chip, a corresponding peripheral processing circuit can also be set on the circuit board to meet the needs of normal use of the sensor. The specific chip model and circuit structure are not limited here.

[0042] In this embodiment, the circuit board 3 is a special-shaped structure, and the top of the two side edges thereof are respectively provided with a first protrusion 31, which is used to cooperate with the inner side wall of the shell to limit the circuit board 3. It should be noted that, in order to facilitate the assembly of the circuit board, there is usually a slight gap between the first protrusion and the inner side wall of the shell. Stopping parts 32 are provided on the upper part of the two side edges of the circuit board 3, which are used to position the shielding ring 4. The first protrusion 31 and the stopper 32 form a step shape. The stopper 32 is located below the first protrusion 31, and its width is narrower than the first protrusion 31. While limiting the shielding ring, the first protrusion 31 ensures that there is an insulating gap between the shielding ring and the inner side wall of the shell. A second protrusion 33 is provided in the middle of the lower end of the circuit board 3 to cooperate with the positioning groove 112 of the inner bottom wall of the shell. When assembling, the second protrusion 33 is inserted into the positioning groove 112 to position the circuit board 3. A clearance groove 34 is provided in the middle of the top of the circuit board 3 for the front end of the cable 5 to be inserted, which is convenient for the cable to be connected to the pad (not shown) on the circuit board, which can reduce the height of the entire sensor and make the structure more compact and small. The circuit board adopts a special-shaped structure, which is matched / fixed with the base, shielding ring and cable. The design is unique and novel, the structure is simple, the processing is convenient, the fixation is reliable, and the overall structure is compact and small.

[0043] like Figure 2 , Figure 3 , Figure 7 As shown, in this embodiment, the shielding ring 4 is a circular ring structure, formed by tin-plated steel plate. The shielding ring 4 surrounds the circuit board 3 and is fixed on both sides of the circuit board 3. In addition, the shielding ring 4 is fixed to the circuit board 3 by soldering, and is connected to the signal ground in the cable through the pad on the circuit board. The shielding ring 4 covers the circuit on the entire circuit board, thereby improving the anti-interference ability of the sensor.

[0044] In this embodiment, after the circuit board 3 and the shielding ring 4 are installed in the base 11, epoxy glue is used as a filler in the accommodating cavity to fill the gap between the circuit board 3 and the base 11, making the circuit board 3 more stable and reliable.

[0045] In this embodiment, the cable 5 is a three-coaxial double-layer insulated double-layer shielded cable, which includes a positive core wire, a plastic insulating sheet, a signal ground metal shielding layer, a plastic insulating layer, a suspended shielding layer, and a wire protection sleeve from the inside to the outside. It can be seen that the outer shield of the cable 5 is suspended as a cable shielding protection, and the inner shield is used as a negative pole for secondary protection. The inner core of the cable is used as a signal pole.

[0046] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An anti-interference vibration and shock composite sensor, characterized in that: It includes a shell, a circuit board, and a cable. A receiving cavity is formed inside the shell. The circuit board is embedded in the receiving cavity and is connected to a vibration and shock sensitive chip. One end of the cable passes through the shell and enters the receiving cavity and is connected to the circuit on the circuit board.

2. The anti-interference vibration and shock composite sensor according to claim 1, characterized in that: It also includes a shielding ring, which surrounds the circuit board and maintains an insulation distance from the inner wall of the shell.

3. The anti-interference vibration and shock composite sensor according to claim 2, characterized in that: The shielding ring is connected to a signal ground on the circuit board.

4. The anti-interference vibration and shock composite sensor according to claim 2, characterized in that: Stopping parts for positioning the shielding ring are provided on the upper parts of the two side edges of the circuit board.

5. The anti-interference vibration and shock composite sensor according to claim 4, characterized in that: The two side edges of the circuit board are respectively provided with first protrusions above the stopper for keeping the shielding ring and the inner wall of the shell at an insulating distance.

6. The anti-interference vibration and shock composite sensor according to claim 1, characterized in that: A second protrusion is provided in the middle of the lower end of the circuit board, and a positioning groove is correspondingly provided on the inner bottom wall of the shell, so that the second protrusion is inserted into the positioning groove to position the circuit board during assembly.

7. The anti-interference vibration and shock composite sensor according to claim 1, characterized in that: A clearance groove for inserting the front end of the cable is arranged in the middle of the top of the circuit board.

8. The anti-interference vibration and shock composite sensor according to claim 1, characterized in that: The invention also comprises a filler, which is located in the accommodating cavity and is used to fill the gap between the circuit board and the inner wall of the shell.

9. The anti-interference vibration and shock composite sensor according to claim 1, characterized in that: The shell comprises a base and a pressure cover, wherein the base is a cavity with an opening at one end, and the pressure cover is fixed to the open end of the base.

10. The anti-interference vibration and shock composite sensor according to claim 9, characterized in that: The outer edge of the gland is annular, and a positioning step is provided at the corresponding outer edge of the inner side wall of the base, so that the outer edge of the gland abuts against the positioning step to position the gland during assembly; the outer edge of the gland and the corresponding inner side wall of the base are interference fit and welded together.

11. The anti-interference vibration and shock composite sensor according to claim 10, characterized in that: The pressure cover includes a cover body, a limiting ring, and a cable fixing cylinder. The limiting ring is located below the cover body and is provided with an opening for inserting a circuit board to clamp and fix the circuit board. The cable fixing cylinder is located above the cover body and is provided with a cylinder hole in the center for the cable to pass through. The cable fixing cylinder can be squeezed and deformed to hold the cable tightly.

12. The anti-interference vibration and shock composite sensor according to claim 11, characterized in that: The cover body is provided with a receiving groove with a bottom opening, and the anti-interference vibration and impact composite sensor also includes a rubber plug. The rubber plug is step-shaped and has a through hole in the middle. The wider part of the rubber plug is accommodated in the receiving groove, and the narrower part extends into the barrel hole. The through hole is used for the cable to pass through. The cable is pressed tightly by the rubber plug cooperating with the receiving groove wall and the barrel hole wall.

13. The anti-interference vibration and shock composite sensor according to claim 9, characterized in that: A stud is arranged at the lower part of the base.

14. The anti-interference vibration and shock composite sensor according to claim 1, characterized in that: The cable comprises, from the inside to the outside, a positive core wire, a plastic insulating sheet, a signal ground metal shielding layer, a plastic insulating layer, a suspended shielding layer, and a wire protection sleeve.

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