Integrated shell structure and ultrasonic sensor

Abstract

The utility model relates to the technical field of sensors, in particular to an integrated shell structure and an ultrasonic sensor, the integrated shell structure comprises an inner shell and an outer shell which are coaxially arranged, a connecting rib is arranged between the inner shell and the outer shell, and two ends of the connecting rib are respectively connected with the inner shell and the outer shell; and the inner shell, the outer shell and the connecting ribs are integrally formed. The inner shell and the outer shell are connected through the connecting rib, so that the inner shell and the outer shell form a whole, and compared with a conventional sensor shell, the sensor shell has the advantages that the assembly procedures of different shells are reduced, the production efficiency is improved, the assembly error occurring when the different shells are assembled is also avoided, the product quality is ensured, and further, the production cost is reduced. The inner shell, the outer shell and the connecting ribs are integrally formed, so that the parts are tightly combined, meanwhile, the integrally formed inner shell, the outer shell and the connecting ribs can effectively control the assembly precision size, the machining difficulty is reduced, the product consistency is improved, and the yield is high.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to an integrated housing structure and an ultrasonic sensor. Background Technology

[0002] An air-medium piezoelectric ceramic ultrasonic sensor is a device that utilizes the propagation characteristics of ultrasound in air or other media. Its core principle is that piezoelectric ceramics generate an electric charge when subjected to pressure, and conversely, generate mechanical stress when a voltage is applied. This interconversion between electrical and mechanical energy is the basis of the ultrasonic sensor's operation. When an excitation voltage is applied to the piezoelectric ceramic, it undergoes mechanical deformation and emits ultrasonic waves. When these ultrasonic waves encounter an obstacle, they are reflected back and received by the same piezoelectric ceramic, thus converting into an electrical signal. Based on the round-trip time difference of the sound and its known speed (usually the speed of sound in air), the distance between the target object and the sensor can be accurately calculated.

[0003] Ultrasonic sensors have a wide range of applications in industrial automation, automotive safety, and smart homes. For example, they can be used to detect the movement of people or objects, measure distances, monitor video, and are widely used in smart offices and smart service robots for obstacle avoidance and material recognition.

[0004] Currently, piezoelectric ceramic ultrasonic sensors generally use two housings of different sizes. The piezoelectric ceramic sheet and matching layer are assembled in the smaller housing, and then the smaller housing is installed inside the larger housing. Glue is then filled between the smaller and larger housings to form a fixed connection.

[0005] However, during the production process, assembly errors are prone to occur when installing the two housings. These assembly errors can lead to poor product consistency, and the installation process for the two housings is complex, which is not conducive to improving efficiency and ensuring quality. Utility Model Content

[0006] The purpose of this invention is to address the problems that current piezoelectric ceramic ultrasonic sensors generally use two housings of different sizes, which can easily lead to assembly errors during the installation of the two housings and are complicated in the installation process. This invention provides an integrated housing structure and an ultrasonic sensor.

[0007] In a first aspect, the present invention provides an integrated shell structure, comprising an inner shell and an outer shell arranged coaxially, wherein a connecting rib is provided between the inner shell and the outer shell, and the two ends of the connecting rib are respectively connected to the inner shell and the outer shell;

[0008] The inner shell, the outer shell, and the connecting rib are integrally formed.

[0009] The integrated shell structure described in the application comprises an inner shell and an outer shell arranged coaxially, a connecting rib is arranged between the inner shell and the outer shell, the inner shell and the outer shell are connected through the connecting rib, so that the inner shell and the outer shell form an integral whole, compared with a conventional sensor shell, the assembly process of different shells is reduced, the labor and time cost is saved, the production efficiency is improved, assembly errors that occur when different shells are assembled are avoided, the quality of the product is ensured, further, the inner shell, the outer shell and the connecting rib are integrally formed, so that the parts are tightly combined, the loosening or deformation that may occur in the connecting part is effectively avoided, so that the structural strength and stability of the shell are enhanced, meanwhile, the integrated forming of the inner shell, the outer shell and the connecting rib can effectively control the assembly precision size, the processing difficulty is reduced, the product consistency is improved, and the yield is high.

[0010] Preferably, an annular cavity is formed between the inner shell and the outer shell, and the connecting rib is located in the annular cavity.

[0011] Preferably, the connecting rib is arranged in a circumferential interval around the outer wall of the inner shell.

[0012] Preferably, the number of the connecting ribs is not less than four.

[0013] Preferably, a U-shaped groove is symmetrically arranged on the connecting rib.

[0014] Preferably, a pre-embedded part partially embedded in the inner shell is further included.

[0015] The pre-embedded part comprises two pre-embedded ends in communication with each other, and the pre-embedded ends extend to the outside of the inner shell.

[0016] Preferably, the pre-embedded ends are located at the top of the inner shell.

[0017] Preferably, the pre-embedded part further comprises an intermediate section, the intermediate section is embedded in the inner shell, and two ends of the intermediate section are connected with one of the pre-embedded ends respectively.

[0018] Preferably, the inner wall of the inner shell has a stepped portion.

[0019] Preferably, the stepped portion is arranged in a circumferential interval along the inner wall of the inner shell.

[0020] In a second aspect, the utility model provides an ultrasonic sensor, including piezoelectric ceramic sheet, backing layer, terminal wire, glue filling layer, matching layer and like the ultrasonic sensor shell of the application,

[0021] The matching layer, the piezoelectric ceramic sheet and the backing layer are sequentially assembled in the inner cavity of the inner shell body, and the piezoelectric ceramic sheet is connected with the matching layer and the backing layer on both sides, respectively, the terminal wire is used for being connected with the piezoelectric ceramic sheet, and the glue filling layer is arranged at one end of the outer shell body away from the matching layer and wraps the terminal wire.

[0022] The ultrasonic sensor provided by the application sequentially assembles a matching layer, a piezoelectric ceramic sheet and a backing layer in an inner cavity of an inner shell body, then connects a terminal wire with the piezoelectric ceramic sheet, and then sets a glue filling layer on an outer shell body to close and fix the terminal wire.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] 1. The integrated shell structure comprises an inner shell body and an outer shell body arranged coaxially, and a connecting rib is arranged between the inner shell body and the outer shell body to connect the inner shell body and the outer shell body, so that the inner shell body and the outer shell body form an integral whole.

[0025] 2. The ultrasonic sensor provided by the application sequentially assembles a matching layer, a piezoelectric ceramic sheet and a backing layer in an inner cavity of an inner shell body, then connects a terminal wire with the piezoelectric ceramic sheet, and then sets a glue filling layer on an outer shell body to close and fix the terminal wire. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a three-dimensional schematic view of the integrated shell structure of the application Figure 1 .

[0027] Figure 2 is a three-dimensional schematic view of the integrated shell structure of the applicationFigure 2 .

[0028] Figure 3 is a sectional view of the integrated shell structure.

[0029] Figure 4 is a structural diagram of the pre-embedded part.

[0030] Figure 5 is a perspective view of the ultrasonic sensor.

[0031] Figure 6 is a sectional view of the ultrasonic sensor.

[0032] Figure 7 is a dimensioned view of the inner shell, the outer shell and the matching layer.

[0033] Figure 8 is a connection diagram of the terminal wire and the piezoelectric ceramic sheet Figure 1 .

[0034] Figure 9 is a connection diagram of the terminal wire and the piezoelectric ceramic sheet Figure 2 (omitting the backing layer and the matching layer).

[0035] Markings in the figure:

[0036] 1 - inner shell, 11 - stepped portion, 2 - outer shell, 3 - connecting rib, 31 - U-shaped groove, 4 - pre-embedded part, 41 - pre-embedded end, 42 - intermediate section, 5 - piezoelectric ceramic sheet, 6 - backing layer, 7 - terminal wire, 8 - glue filling layer, 9 - matching layer, 10 - annular cavity, 20 - lead wire. DETAILED DESCRIPTION

[0037] The utility model will be described in further detail below in combination with specific embodiments. However, this should not be understood as limiting the scope of the above-mentioned subject matter of the utility model to the following embodiments. Any technology realized based on the content of the utility model falls within the scope of the utility model.

[0038] In the description of the specific embodiments of the utility model, the orientation or position relationship terms appearing in the description, such as "up", "down", "left", "right", "center", "inner", "outer", etc. are based on the orientation or position relationship expressed in the drawings, or the orientation or position relationship used when the product / equipment / device of the utility model is normally used. These orientation or position relationship terms are only used to facilitate the description of the utility model scheme or simplify the description in the specific embodiments, so as to facilitate the quick understanding of the scheme by the technicians, and therefore cannot be understood as indicating or implying that a specific device / part / element must have a specific orientation, or must be constructed and operated in a specific position relationship, and therefore cannot be understood as limiting the utility model.

[0039] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding device / component / element must be absolutely horizontal or vertical or overhanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to understand that the corresponding device / component / element is arranged in the direction of "horizontal", "vertical", "overhanging", "parallel" and the like, and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the utility model scheme.

[0040] In addition, the terms "first", "second", "third", and the like in the description of the utility model embodiments are only used to distinguish the same or similar components, and should not be understood as emphasizing or implying the relative importance of the specific components.

[0041] In addition, in the description of the embodiments of the utility model, "several", "a plurality of", "several" represent at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9, etc. Any case, or even more than 9 cases.

[0042] In addition, in the description of the technical scheme of the utility model, unless otherwise specified / limited / limited, the terms "set", "install", "connect", "connect", "set", "lay", "arrange" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, which can be welding, riveting, bolting, screw connection and other commonly used connection means in the art. The connection can be mechanical connection, electrical connection or communication connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements.

[0043] Embodiment 1

[0044] As shown in Figures 1-4 The one-piece shell structure described in the present application comprises an inner shell 1 and an outer shell 2 arranged coaxially, a connecting rib 3 is arranged between the inner shell 1 and the outer shell 2, and the connecting rib 3 is connected to the inner shell 1 and the outer shell 2 at both ends;

[0045] The inner shell 1, the outer shell 2 and the connecting rib 3 are integrally formed.

[0046] The inner shell 1 and the outer shell 2 are connected through the connecting rib 3, so that the inner shell 1 and the outer shell 2 form an integral whole, compared with a conventional sensor shell, the assembly process of different shells is reduced, the labor and time cost is saved, the production efficiency is improved, the assembly error of different shells is avoided, the quality of the product is ensured, further, the inner shell 1, the outer shell 2 and the connecting rib 3 are integrally formed, so that the parts are tightly combined, the loosening or deformation of the connecting part is effectively avoided, so that the structural strength and stability of the shell are enhanced, at the same time, the integrally formed setting of the inner shell 1, the outer shell 2 and the connecting rib 3 can effectively control the assembly precision size, reduce the processing difficulty, improve the product consistency, and the yield is high.

[0047] In the present application, the integrally formed process of the inner shell 1, the outer shell 2 and the connecting rib 3 adopts a conventional injection molding process, and the material is PC material.

[0048] In one or more embodiments, the inner shell 1 and the outer shell 2 are cylindrical structures, the shell 1 is located in the inner cavity of the outer shell 2, one end of the connecting rib 3 is connected to the outer wall of the inner shell 1, and the other end of the connecting rib 3 is connected to the inner wall of the outer shell 2.

[0049] In one or more embodiments, as shown in Figure 1 , Figure 2 An annular cavity 10 is formed between the inner shell 1 and the outer shell 2, and the connecting rib 3 is located in the annular cavity 10.

[0050] An annular cavity 10 is formed between the inner shell 1 and the outer shell 2, and the connecting rib 3 is located in the annular cavity 10.

[0051] In an optional embodiment, as shown in Figure 3 A U-shaped groove 31 is symmetrically arranged on the connecting rib 3. By arranging the U-shaped groove 31 on the connecting rib 3, the volume of the connecting rib 3 is reduced, and the resonance influence of the outer shell 2 on the inner shell 1 is further reduced.

[0052] In an optional embodiment, as shown in Figures 1-3 The connecting rib 3 is circumferentially and spacedly arranged around the outer wall of the inner shell 1. By circumferentially and spacedly arranging the connecting rib 3 around the outer wall of the inner shell 1, the outer shell 2 and the inner shell 1 are connected in space, so that the outer shell 2 and the inner shell 1 can be firmly connected;

[0053] Further, the number of the connecting rib 3 is not less than four.

[0054] In one or more embodiments, as shown in Figure 1 , Figure 3As shown, it also includes some embedded parts 4 pre-embedded in the inner shell 1;

[0055] The embedded part 4 includes two interconnected embedded ends 41, which extend to the outside of the inner shell 1.

[0056] By setting a pre-embedded part 4 on the inner shell 1, and the pre-embedded part 4 includes two interconnected pre-embedded ends 41, one pre-embedded end 41 is used to connect the positive or negative electrode of the piezoelectric ceramic sheet 5, and the other pre-embedded end 41 is used to connect with the terminal wire 7 or probe. After the piezoelectric ceramic sheet 5 is installed in the inner cavity of the inner shell 1, the piezoelectric ceramic sheet 5 can be conveniently connected to the terminal wire 7 or probe through the pre-embedded part 4. It is not necessary to add a part to the inner shell 1 for nesting and welding pins, thereby reducing the number of parts. Under the premise of ensuring that the integrated shell structure of this embodiment can function normally, the structure is effectively simplified and the production efficiency is improved.

[0057] Furthermore, there are two embedded parts 4, which are arranged opposite to each other. When assembling the ultrasonic sensor, after the piezoelectric ceramic sheet 5 is installed in the inner cavity of the inner housing 1, one embedded part 4 is used to connect with the positive electrode of the piezoelectric ceramic sheet 5, and the other embedded part 4 is used to connect with the negative electrode of the piezoelectric ceramic sheet 5. The external terminal wire 7 can be connected to the empty embedded end of the embedded part 4 to achieve communication with the piezoelectric ceramic sheet 5, which greatly simplifies the connection process of the terminal wire 7.

[0058] In optional implementations, such as Figure 3 As shown, the pre-embedded end 41 is located at the top of the inner housing 1. Setting the two pre-embedded ends 41 at the top of the inner housing 1 makes the subsequent connection with the terminal line 7 more convenient.

[0059] In optional implementations, such as Figure 4 As shown, the embedded part 4 also includes an intermediate section 42, which is embedded in the inner shell 1. Both ends of the intermediate section 42 are connected to an embedded end 41.

[0060] The two pre-embedded ends 41 are connected by the middle section 42 to realize the passage between the two pre-embedded ends 41.

[0061] In an optional embodiment, the inner wall of the inner housing 1 has a stepped portion 11.

[0062] like Figure 6As shown, the backing layer 6 is embedded in the inner cavity of the inner shell 1 from one end of the inner shell 1 and abuts against the stepped portion 11, and the matching layer 9 is embedded in the inner cavity of the inner shell 1 from the other end of the inner shell 1 and abuts against the stepped portion 11, at this time, the stepped portion 11 separates the backing layer 6 and the matching layer 9, so that the first interval is formed between the backing layer 6 and the matching layer 9, and the piezoelectric ceramic sheet 5 is located in the first interval, and there is a gap between the piezoelectric ceramic sheet 5 and the stepped portion 11.

[0063] In an optional embodiment, the stepped portion 11 is circumferentially spaced along the inner wall of the inner shell 1.

[0064] In an optional embodiment, the stepped portion 11 is continuously arranged along the inner wall of the inner shell 1 to form a ring shape.

[0065] In one or more embodiments, as shown, Figure 7 the stepped portion 11 forms a ring shape, and the inner diameter of the stepped portion 11 is a, the value range of a is φ7mm-φ9mm, and the size of a can be adjusted according to the diameter size of the piezoelectric ceramic sheet 5.

[0066] The inner diameter of the outer shell 2 is b, the value range of b is φ11mm-φ13mm, so as to adjust and control the residual vibration caused by the change of the size of a to ensure the suppression of the residual vibration.

[0067] The thickness of the matching layer 9 is c, the value range of c is 1mm-5mm, and the thickness of the matching layer 9 can be adjusted according to the parameter performance requirement.

[0068] When the integrated shell structure is manufactured, the sizes of a, b and c can be adjusted according to different parameter requirements to meet more user requirements and adapt to more application scenarios.

[0069] Embodiment 2

[0070] Based on the embodiment 1, as shown, Figures 5-9 the ultrasonic sensor described in the embodiment includes the piezoelectric ceramic sheet 5, the backing layer 6, the terminal wire 7, the glue filling layer 8, the matching layer 9 and the integrated shell structure described in the embodiment 1.

[0071] The matching layer 9, the piezoelectric ceramic sheet 5 and the backing layer 6 are sequentially assembled in the inner cavity of the inner shell 1, and the piezoelectric ceramic sheet 5 is connected with the matching layer 9 and the backing layer 6 on both sides, the terminal wire 7 is used to be connected with the piezoelectric ceramic sheet 5, the glue filling layer 8 is arranged at the end of the outer shell 2 away from the matching layer 9, and the glue filling layer 8 wraps the terminal wire 7.

[0072] During production and assembly, the matching layer 9, the piezoelectric ceramic sheet 5, and the backing layer 6 are sequentially assembled into the inner cavity of the inner housing 1. Then, the terminal wire 7 is connected to the piezoelectric ceramic sheet 5. Finally, an encapsulation layer 8 is applied to the outer housing 2 to seal and fix the terminal wire 7. Since the inner housing 1 and the outer housing 2 are integrated, the assembly process of different housings is reduced during installation, improving the overall assembly efficiency of the ultrasonic sensor and avoiding assembly errors that occur when assembling different housings, thus ensuring the product quality of the ultrasonic sensor.

[0073] Among them, such as Figure 8 , Figure 9 As shown, two embedded parts 4 are provided on the inner shell 1. Each embedded part 4 includes two interconnected embedded ends 41 and an intermediate section 42. The two ends of the intermediate section 42 are respectively connected to one embedded end 41, and the intermediate section 42 is embedded in the inner shell 1. The embedded ends 41 are located at the top of the inner shell 1. When connecting the wires of the piezoelectric ceramic sheet 5, one embedded end 41 is connected to the positive or negative pole of the piezoelectric ceramic sheet 5, and then the terminal wire 7 is connected to the other embedded end 41, so that the terminal wire 7 is connected to the positive or negative pole of the piezoelectric ceramic sheet 5.

[0074] Furthermore, the positive or negative electrode of the piezoelectric ceramic sheet 5 is connected to one embedded end 41 of the embedded part 4 via the lead wire 20, and the terminal wire 7 is connected to the other embedded end 41 of the embedded part 4.

[0075] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated housing structure, characterized by, The application relates to an integrated shell structure, which comprises an inner shell (1) and an outer shell (2) arranged coaxially, and a connecting rib (3) arranged between the inner shell (1) and the outer shell (2) and connected to the inner shell (1) and the outer shell (2) at two ends. The inner shell (1), the outer shell (2) and the connecting rib (3) are integrally formed.

2. An integral housing structure according to claim 1, wherein An annular cavity (10) is formed between the inner shell (1) and the outer shell (2), and the connecting rib (3) is arranged in the annular cavity (10).

3. An integral housing structure according to claim 1, wherein The connecting rib (3) is arranged in a circumferential direction on the outer wall of the inner shell (1).

4. The one-piece housing structure of claim 1, wherein A U-shaped groove (31) is symmetrically arranged on the connecting rib (3).

5. The one-piece housing structure of claim 1, wherein The application further relates to a pre-embedded part (4) partially embedded in the inner shell (1). The pre-embedded part (4) comprises two pre-embedded ends (41) in communication with each other, and the pre-embedded ends (41) extend to the outside of the inner shell (1).

6. An integral housing structure according to claim 5, wherein The pre-embedded ends (41) are arranged on the top of the inner shell (1).

7. An integral housing structure according to claim 5, wherein The pre-embedded part (4) further comprises an intermediate section (42) embedded in the inner shell (1), and the two ends of the intermediate section (42) are respectively connected to one of the pre-embedded ends (41).

8. The one-piece housing structure of claim 1, wherein The inner wall of the inner shell (1) is provided with a stepped portion (11).

9. An integrated housing structure according to claim 8, wherein The stepped portion (11) is arranged in a circumferential direction on the inner wall of the inner shell (1).

10. An ultrasonic sensor, characterized by The application further relates to a piezoelectric ceramic device, which comprises a piezoelectric ceramic sheet (5), a backing layer (6), a terminal wire (7), a glue filling layer (8), a matching layer (9) and the integrated shell structure as claimed in any one of claims 1-9. The matching layer (9), the piezoelectric ceramic sheet (5) and the backing layer (6) are sequentially arranged in the inner cavity of the inner shell (1), and the piezoelectric ceramic sheet (5) is connected to the matching layer (9) and the backing layer (6) at two sides, the terminal wire (7) is used for connecting the piezoelectric ceramic sheet (5), the glue filling layer (8) is arranged at one end of the outer shell (2) away from the matching layer (9), and the glue filling layer (8) wraps the terminal wire (7).

Images