An ultrasonic sensor silica gel structure capable of reducing residual vibration and an ultrasonic sensor

Abstract

The utility model relates to sensor technical field discloses an ultrasonic sensor silica gel structure and sensor that reduce the aftervibration, including the silica gel main part of filling in the ultrasonic sensor shell, the silica gel main part solidification and the shell inner wall adhesion, and the end face of silica gel main part far away from the shell internal part is the working face, wherein, the working face center position is equipped with a boss structure, the boss structure does not contact with the shell, and the diameter of boss structure is less than the diameter of silica gel main part, the utility model discloses a boss structure is added in the silica gel main part working face center, utilizes the boss to increase silica gel end mass to change sensor inherent frequency, avoids the resonance frequency of shell and silica gel, and simultaneously with the damping action of boss in the maximum position of vibration, quickly consumes vibration energy, significantly reduces the vibration of the remaining incentive stop, solves the problem that the existing sensor is led to the aftervibration of big because resonance.

Description

Technical Field

[0001] This utility model relates to the field of sensors, specifically to a silicone structure for reducing residual vibration in an ultrasonic sensor and an ultrasonic sensor. Background Technology

[0002] As a device that uses ultrasound for detection, the operational stability of an ultrasonic sensor is closely related to its vibration characteristics. Residual vibration (i.e., the vibration remaining in the sensor after excitation stops) is a key factor affecting its detection accuracy and response speed. After the internal components of an existing ultrasonic sensor (such as transducers and leads) are assembled, they need to be encapsulated with silicone inside a housing (usually an aluminum housing). After the encapsulated silicone cures, its surface remains flush with the end face of the housing, forming a smooth, continuous structure. Simultaneously, the silicone adheres tightly to the inner wall and end face of the housing, forming a rigidly connected whole. When the sensor is working, the housing is excited and generates radial vibration. This vibration is transmitted to the silicone through the adhesive surface between the housing and the silicone, causing the silicone to vibrate at a frequency similar to that of the housing. The vibration of the silicone then reacts back onto the housing, forming a resonant cycle between the housing and the silicone.

[0003] The aforementioned resonant cycle makes it difficult for vibrational energy to dissipate quickly, causing the sensor to vibrate for a considerable period after the excitation stops. Excessive residual vibration directly affects the sensor's performance: on the one hand, residual vibration interferes with subsequent detection signals, leading to a decrease in measurement accuracy; on the other hand, it prolongs the sensor's response time, making it difficult to meet the requirements of high-frequency detection or fast-response scenarios. Utility Model Content

[0004] The purpose of this invention is to provide an ultrasonic sensor silicone structure and ultrasonic sensor that reduces residual vibration. By adding a boss structure to the silicone end of the sensor, the increased mass of the silicone end by the boss structure changes the natural frequency of the sensor as a whole, thus avoiding resonance between the silicone and the shell. At the same time, the boss structure is designed at the position of maximum vibration of the sensor, and the damping effect of the boss can further consume the vibration, so that the vibration can stop quickly, thereby achieving the effect of reducing residual vibration.

[0005] This utility model is achieved through the following technical solution:

[0006] An ultrasonic sensor silicone structure for reducing residual vibration includes a silicone body encapsulated within an ultrasonic sensor housing. After curing, the silicone body adheres to the inner wall of the housing, and the end face of the silicone body away from the internal parts of the housing serves as the working surface.

[0007] The working surface has a boss structure at its center, the diameter of which is smaller than the diameter of the silicone body, and the boss structure and the outer shell are located on the same axis.

[0008] In this solution, a boss structure with a diameter smaller than that of the silicone body is set at the center of the working surface of the silicone body that is bonded to the inner wall of the shell. The boss can increase the mass of the silicone end and change the natural frequency of the sensor as a whole, thereby avoiding resonance between the silicone and the shell. At the same time, since the boss is located at the center of the greatest vibration, the damping effect of the silicone can be used to further consume the vibration energy and make the vibration stop quickly. This effectively improves the problem of large residual vibration caused by resonance between the silicone and the shell in existing ultrasonic sensors, improves the detection accuracy and response speed of the sensor, and better meets the needs of high-frequency detection or fast response scenarios.

[0009] As a further embodiment of the silicone structure, the boss structure is made of silicone with added high-density material. The high-density material can increase the mass of the boss, further change the inherent frequency of the sensor as a whole, and more effectively avoid the resonant frequency between the silicone and the shell.

[0010] As a further embodiment of the silicone structure, to more effectively avoid the resonant frequency between the silicone and the outer shell, the high-density material is alumina, tungsten powder, barium sulfate, or zinc oxide.

[0011] As a further embodiment of the silicone structure, the boss structure is columnar, with a cross-sectional shape that is one or more combinations of circles, squares, and polygons. This provides more options for different application scenarios and design requirements. Whether it is the simplicity and ease of processing of the circle, the structural stability of the square, or the adaptability of the polygon, the boss can ensure the assembly compatibility with the silicone body or shell, while not affecting its connection strength with the silicone body or its characteristic of not contacting the shell. This allows it to continuously reduce residual vibration in diverse applications, thereby improving the applicability and practicality of the ultrasonic sensor.

[0012] As a further embodiment of the silicone structure, the boss structure and the silicone body are integrally molded, which can enhance the connection strength between the two and avoid the boss from becoming loose or falling off during the operation of the sensor due to unstable connection.

[0013] As a further solution to the silicone structure, the boss structure is fixed to the working surface of the silicone body by adhesive bonding. This adhesive bonding method provides more flexible assembly options for production. In particular, when the boss structure needs to be processed separately or different sizes of bosses need to be replaced to adapt to different vibration scenarios, the production process can be simplified and the reliance on one-piece molding process can be reduced.

[0014] As a further embodiment of the silicone structure, the diameter of the boss structure is between 30% and 70% of the diameter of the silicone body, and the height of the boss structure is between 0.5 and 2 times the diameter of the silicone body. This ensures that the boss effectively increases the mass of the silicone end to change the overall natural frequency of the sensor, while avoiding contact with the outer shell or affecting the overall structural balance of the sensor due to the boss being too large. It also prevents the damping effect from being insufficient and consuming vibration energy due to the boss being too small.

[0015] An ultrasonic sensor, comprising:

[0016] A housing with an opening at the end face;

[0017] Transducer and terminal wires assembled inside the housing;

[0018] A silicone structure is encapsulated within the housing, and the silicone structure encapsulates the transducer and seals the end face opening of the housing.

[0019] As a further embodiment of the ultrasonic sensor, the housing is made of aluminum. The radial vibration amplitude of the housing is greatest at the center position, and the center of the boss structure coincides with the radial center of the housing. This allows the boss structure to correspond to the position of the most intense vibration, thereby fully utilizing the effect of the boss in changing the overall natural frequency of the sensor by increasing its mass and consuming vibration energy through damping. This effectively avoids resonance between the housing and the silicone, accelerates the dissipation of vibration energy, and further reduces the residual vibration of the ultrasonic sensor.

[0020] As a further embodiment of the ultrasonic sensor, to further enhance the suppression of residual vibration, the silicone body is flush with the end face of the outer shell, and the boss structure protrudes from the end face of the outer shell in a direction away from the interior of the outer shell.

[0021] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0022] This invention adds a boss structure to the center of the working surface of the silicone body, thereby increasing the mass of the silicone end and changing the overall natural frequency of the sensor. This avoids the resonance frequency between the shell and the silicone. At the same time, the damping effect of the boss at the position of maximum vibration quickly consumes vibration energy, significantly reducing the residual vibration frequency after the excitation stops. This solves the problem of large residual vibration caused by resonance in existing sensors. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the existing silicone structure of an ultrasonic sensor;

[0025] Figure 2 This is a schematic diagram of the silicone structure of this utility model;

[0026] Figure 3 This is a front view schematic diagram of the silicone structure of this utility model.

[0027] The attached diagram shows the markings and corresponding component names:

[0028] 1-Outer shell, 2-Silicone body, 3-Boss structure, 4-Terminal wire. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0030] Example 1

[0031] like Figure 1 As shown, existing ultrasonic sensors, after assembling their internal components, are encapsulated in silicone. After curing, the silicone has a smooth, single-piece surface and adheres to the aluminum casing. During operation, the vibration of the aluminum casing is ultimately transmitted to the silicone, which in turn generates a vibration at a similar frequency to the casing. This vibration is then transmitted back to the casing, causing resonance between the ultrasonic sensor and the silicone. This continuous vibration leads to a large residual vibration, a defective phenomenon. To solve this problem, the following technical solution is proposed:

[0032] This embodiment 1 provides a silicone structure for an ultrasonic sensor to reduce residual vibration, such as... Figures 2-3 As shown, the device includes a silicone body 2 encapsulated inside the ultrasonic sensor housing 1. After curing, the silicone body 2 is tightly bonded to the inner wall of the housing 1. At the same time, the shape of the silicone body 2 is adapted to the inner wall of the housing 1, and is cylindrical with a diameter slightly smaller than the inner diameter of the housing 1 to ensure full filling during encapsulation. The end face of the silicone body 2 away from the transducer inside the housing 1 is the working surface (i.e., the surface flush with the end face of the housing 1).

[0033] Among them, such as Figure 2As shown, a boss structure 3 is provided at the center of the working surface. The boss structure 3 is integrally formed with the silicone body 2. Of course, in order to provide more flexible assembly options for production, the boss structure 3 can also be fixed to the working surface of the silicone body 2 by adhesive bonding. The boss structure 3 is columnar, and its cross-sectional shape is one or more combinations of circles, squares, and polygons. The diameter of the boss structure 3 is between 30% and 70% of the diameter of the silicone body 2, and the height of the boss structure 3 is between 0.5 and 2 times the diameter of the silicone body 2. In this way, while ensuring that the boss effectively increases the mass of the silicone end to change the overall natural frequency of the sensor, it avoids the boss being too large and causing contact with the shell or affecting the overall structural balance of the sensor. It also prevents the boss from being too small and failing to fully exert its damping effect to consume vibration energy.

[0034] like Figures 2-3 As shown, the boss structure 3 does not contact the outer shell 1, and the axis of the boss structure 3 is completely coincident with the radial center of the outer shell 1. Since the vibration mode of the sensor is radial vibration, the vibration is greatest at the center position in the radial direction. In this way, the vibration energy can be quickly consumed by the damping effect of the boss at the position of maximum vibration, and the residual vibration after the excitation stops can be significantly reduced.

[0035] In this embodiment, to further and effectively avoid the resonant frequency between the silicone and the outer shell, the above-mentioned boss structure 3 is made of high-density silicone. The high-density silicone is silicone containing metal powder, such as alumina, tungsten powder, barium sulfate, or zinc oxide, or it can also be silicone containing ceramic particles. By increasing the mass of the boss through the characteristics of high-density materials, the inherent frequency of the sensor as a whole is further changed, and the resonant frequency between the silicone and the outer shell is avoided more effectively.

[0036] Example 2

[0037] This embodiment 2 provides an ultrasonic sensor, which includes a housing 1 with an end face opening, a transducer and terminal wire 4 assembled inside the housing 1, and a silicone structure encapsulated inside the housing 1. The silicone structure is the same as the silicone structure in Embodiment 1, and the silicone structure wraps around the transducer and closes the end face opening of the housing 1.

[0038] The outer shell 1 is made of aluminum. The radial vibration amplitude of the outer shell 1 is the largest at the center position. The center of the boss structure 3 coincides with the radial center of the outer shell, which allows the boss structure to correspond to the position of the most intense vibration. This fully utilizes the effect of the boss to change the overall natural frequency of the sensor by increasing its mass and to consume vibration energy through damping.

[0039] Meanwhile, to further enhance the suppression effect on residual vibration, the silicone body 2 is flush with the end face of the outer shell 1, and the boss structure 3 protrudes from the end face of the outer shell 1 in a direction away from the interior of the outer shell 1.

[0040] Working principle: After assembling the transducer and terminal wires 4 inside the sensor, a cylindrical mold matching the boss structure 3 is placed on the end face of the housing 1. Silicone rubber mixed with tungsten powder is poured into the housing 1. After curing for 24 hours, the mold is removed, forming the silicone structure 3 with the boss. When the sensor is working, the aluminum housing 1 generates radial vibration. The vibration is transmitted to the boss structure 3 through the silicone body 2. Since the boss is located at the center of the maximum vibration, its extra mass causes the sensor's natural frequency to deviate from the resonance point. Furthermore, the high-damping silicone quickly absorbs the vibration energy, causing the vibration to decay to below the initial amplitude after the excitation stops, significantly reducing residual vibration.

[0041] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A silicone structure for an ultrasonic sensor to reduce residual vibration, characterized in that, The device includes a silicone body (2) encapsulated inside the ultrasonic sensor housing (1). After curing, the silicone body (2) adheres to the inner wall of the housing (1), and the end face of the silicone body (2) away from the internal parts of the housing (1) is the working surface. The working surface has a boss structure (3) at its center. The diameter of the boss structure (3) is smaller than the diameter of the silicone body (2), and the boss structure (3) and the outer shell (1) are located on the same axis.

2. The ultrasonic sensor silicone structure for reducing residual vibration according to claim 1, characterized in that, The boss structure (3) is a component made of high-density silicone.

3. The ultrasonic sensor silicone structure for reducing residual vibration according to claim 2, characterized in that, The high-density silicone is silicone containing metal powder or ceramic particles.

4. The ultrasonic sensor silicone structure for reducing residual vibration according to claim 1, characterized in that, The boss structure (3) is columnar, and its cross-sectional shape is one or more combinations of circles, squares, and polygons.

5. The ultrasonic sensor silicone structure for reducing residual vibration according to claim 4, characterized in that, The boss structure (3) and the silicone body (2) are integrally molded.

6. The ultrasonic sensor silicone structure for reducing residual vibration according to claim 4, characterized in that, The boss structure (3) is fixed to the working surface of the silicone body (2) by adhesive bonding.

7. The ultrasonic sensor silicone structure for reducing residual vibration according to claim 1, characterized in that, The diameter of the boss structure (3) is between 30% and 70% of the diameter of the silicone body (2), and the height of the boss structure (3) is between 0.5 and 2 times the diameter of the silicone body (2).

8. An ultrasonic sensor, characterized in that, include: A housing with an end face opening (1); Transducer and terminal wire (4) assembled inside the housing (1); A silicone structure is encapsulated within the housing (1), the silicone structure being the silicone structure according to any one of claims 1-7, and the silicone structure encapsulates the transducer and closes the end face opening of the housing (1).

9. An ultrasonic sensor according to claim 8, characterized in that, The outer shell (1) is an aluminum shell. The radial vibration amplitude of the shell is the largest at the center position, and the center of the boss structure (3) coincides with the radial center of the outer shell (1).

10. An ultrasonic sensor according to claim 9, characterized in that, The silicone body (2) is flush with the end face of the outer shell (1), and the boss structure (3) protrudes from the end face of the outer shell (1) in a direction away from the interior of the outer shell (1).

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