Ultrasonic sensor shell and ultrasonic sensor

Abstract

The utility model relates to the technical field of sensors, in particular to an ultrasonic sensor shell and an ultrasonic sensor, the inner side of one end of the shell is provided with an annular plate, the inner side of the annular plate is provided with a panel, the panel is used for connecting a piezoelectric ceramic piece, the shell, the annular plate and the panel are integrally formed, and the outer side of the annular plate is provided with a first annular groove. According to the ultrasonic sensor shell, the panel is used as a matching layer for transmitting signals of the piezoelectric ceramic piece, so that the shell is coupled with the piezoelectric ceramic piece, an additional matching layer is not needed, and the technological process is greatly simplified. A first annular groove is formed in the outer side of the annular plate, and the signal energy is regulated and controlled under the cooperation of a specific sound barrel structure, so that the detection range of the manufactured ultrasonic sensor is relatively enlarged, and meanwhile, a certain restraining effect on sound wave propagation is achieved; therefore, the ultrasonic sensor can still meet the use requirements after the ultrasonic sensor shell is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field, especially a kind of ultrasonic sensor shell and ultrasonic sensor. BACKGROUND

[0002] Ultrasonic sensor has wide application in industrial automation, automobile safety, smart home and other fields. For example, it can be used to detect the movement of people or objects, measure distance, monitor video, and has wide application in intelligent office, intelligent service robot as obstacle avoidance, material identification and other working conditions.

[0003] With the development of market, Chinese intelligent cleaning robot has set sail, and occupied more than half of the global market share; Ultrasonic sensor is required to have high frequency, low energy consumption, high precision, small size, and has identification ability under different working conditions such as different types of floor, carpet and ground seam, sliding door rail obstacle, stair cliff.

[0004] The existing piezoelectric ceramic ultrasonic sensor generally adopts two kinds of shell, such as the Chinese patent with application number CN221464641U discloses an air medium ultrasonic sensor, which is assembled by filling sealant, piezoelectric ceramic, pin back cover and matching layer, but its structure is complex, the process is complicated, the influence variables of function are many, and the quality control is difficult. UTILITY MODEL CONTENT

[0005] The utility model aims at: in view of the piezoelectric ceramic ultrasonic sensor generally adopts matching layer and two kinds of shell at present, its structure is complex, the process is complicated, the influence variables of function are many, and the quality control is difficult, etc. Problem, provide a kind of ultrasonic sensor shell and a kind of ultrasonic sensor.

[0006] In the first aspect, the application provides an ultrasonic sensor shell, which comprises an outer shell, the inner side of one end of the outer shell has an annular plate, the inner side of the annular plate is provided with a panel, the panel is used to connect piezoelectric ceramic sheet, the outer shell, annular plate and panel are integrally formed, and the outer side of the annular plate is provided with a first annular groove.

[0007] The ultrasonic sensor shell described in the application has a ring-shaped plate on the inner side of one end of the shell, the inner side of the ring-shaped plate is provided with a panel, and the shell, the ring-shaped plate and the panel are integrally formed, so that the shell, the ring-shaped plate and the panel form an integral whole. Since the shell and the matching layer of the conventional ultrasonic sensor are separately manufactured, the secondary assembly of the shell and the matching layer is required during the production of the sensor, which not only has a complex structure and a complicated process, but is also easily affected by the assembly tolerance during the assembly process, resulting in poor consistency of the product. The ultrasonic sensor shell of the application has an integrated arrangement of the shell, the ring-shaped plate and the panel. During the production of the sensor, the piezoelectric ceramic sheet is connected to the panel, the panel is used as the matching layer for the transmission of the signal of the piezoelectric ceramic sheet, so as to realize the coupling of the shell with the piezoelectric ceramic sheet, and an additional matching layer is no longer needed, greatly simplifying the process flow.

[0008] Further preferably, a first ring-shaped groove is arranged on the outer side of the ring-shaped plate, which cooperates with the structure of the specific acoustic bucket to regulate the signal energy, so that the detection range of the ultrasonic sensor made thereafter is relatively increased, and the propagation of the acoustic wave is constrained to some extent, so that the ultrasonic sensor can still meet the use requirements after the ultrasonic sensor shell is improved as described above.

[0009] Preferably, the ultrasonic sensor shell of the application further comprises an inner shell, the outer shell is sleeved on the outer side of the inner shell, and the inner shell is connected with at least one of the ring-shaped plate and the panel.

[0010] The inner shell is used to protect the structure on the inner side of the shell and facilitate assembly.

[0011] Preferably, the inner shell, the outer shell, the ring-shaped plate and the panel are integrally formed.

[0012] The ultrasonic sensor shell described in the present application is integrally formed with the inner shell, the outer shell, the annular plate and the panel to form an integral whole. Since the inner shell, the outer shell and the matching layer of the conventional ultrasonic sensor are separately made, the secondary assembly of the inner shell, the outer shell and the matching layer is required when the sensor is produced, which not only has a complex structure and a complicated process, but is also easily affected by the assembly tolerance in the assembly process, resulting in poor consistency of the product. The ultrasonic sensor shell of the present application is integrally provided with the inner shell, the outer shell, the annular plate and the panel. In the production of the ultrasonic sensor, the piezoelectric ceramic sheet is connected to the panel, and the panel is used as the matching layer for the transmission of the signal of the piezoelectric ceramic sheet, so as to realize the coupling of the shell with the piezoelectric ceramic sheet, and thus the matching layer is no longer needed, greatly simplifying the process flow. Further, since the inner shell and the outer shell are integrally provided, the small plastic shell is no longer needed for positioning the piezoelectric ceramic sheet, and the assembly tolerance that easily occurs when the two outer shells are assembled is also avoided. The ultrasonic sensor shell of the present application has a simple process, effectively reduces the variable factors, reduces the difficulty of production quality control, and effectively improves the production efficiency of the conventional ultrasonic sensor.

[0013] Preferably, the inner shell and the outer shell are coaxially arranged to ensure the coaxiality of the inner shell and the outer shell, and to ensure the symmetry of the vibration of the ultrasonic sensor shell and the uniform transmission of the ultrasonic wave.

[0014] Preferably, a first accommodating cavity is formed between the inner shell and the panel, and the first accommodating cavity is used for placing the piezoelectric ceramic sheet.

[0015] Preferably, a second accommodating cavity is formed between the inner shell, the outer shell and the annular plate. The second accommodating cavity is used for accommodating the vibration damping layer, which improves the size of the residual vibration of the piezoelectric ceramic sheet.

[0016] Preferably, the end of the inner shell away from the panel is located inside the outer shell.

[0017] Preferably, the end of the inner shell away from the panel is provided with a first groove. The first groove is used for conveniently installing and positioning at least one of the terminal wire and the lead-out wire.

[0018] Preferably, the first groove is at least two, and all the first grooves are arranged circumferentially along the inner shell.

[0019] The first protrusion is configured to protect the structure inside the outer shell and facilitate the assembly of the piezoelectric ceramic sheet.

[0020] Preferably, the inner shell is cylindrical.

[0021] Preferably, the outer diameter of the inner shell is Φ8.2mm-Φ11mm.

[0022] Preferably, the inner shell comprises at least two first boss structures, all of the first boss structures are arranged circumferentially spaced apart, and one end of the first boss structure is connected to at least one of the panel and the annular plate. The first boss structure is used to protect the inner structure of the outer shell and facilitate the assembly of the piezoelectric ceramic sheet.

[0023] Preferably, the outer shell is cylindrical.

[0024] Preferably, the outer shell, the annular plate and the panel form an inner cavity with one end closed. That is, the outer shell, the annular plate, the panel, the connection between the annular plate and the outer shell, and the connection between the annular plate and the panel are all not provided with through holes to facilitate the assembly of the backing.

[0025] Preferably, the density of the panel is 0.35g / cm³ to 0.9g / cm³.

[0026] Preferably, the thickness of the panel is 1.6mm to 3.0mm.

[0027] Thus, the panel can meet the requirements as a matching layer.

[0028] Preferably, a second annular groove is arranged on the inner side of the annular plate. The second annular groove is used to adjust the area of the panel in contact with the piezoelectric ceramic sheet, so as to adjust the size of the residual vibration of the ultrasonic sensor. Further, the third annular groove can be used to fill the elastic glue to suppress the vibration of the piezoelectric ceramic sheet towards the outer shell, or to fill the backing glue to form part of the backing layer, thereby better reducing the vibration.

[0029] Preferably, the second annular groove is arranged corresponding to the first annular groove, so as to jointly control the thickness of the annular plate, thereby reducing the influence of the annular plate on the vibration of the panel.

[0030] Preferably, the inner side of the annular plate and the inner side of the panel are arranged flush. In this way, the reliability of connecting the annular plate and the panel is increased.

[0031] Preferably, the inner side of the annular plate is higher than the inner side of the panel, and the annular plate and the inner side of the panel form a placement groove for placing the piezoelectric ceramic sheet.

[0032] Preferably, the first annular groove is connected with a reinforcing rib between opposite sides of the first annular groove, so as to adjust the strength of the residual vibration and accurately control the residual vibration to a certain interval.

[0033] Preferably, the reinforcing rib is at least two, and adjacent reinforcing ribs are arranged spaced apart. The reinforcing rib divides the first annular groove into a plurality of arc-shaped grooves.

[0034] The plurality of reinforcing ribs can further precisely control the strength of the residual vibration to a certain interval, and in combination with the specific sound bucket structure, the ultrasonic echo energy can be precisely controlled to a certain interval.

[0035] Specifically, the reinforcing ribs are arranged such that the first annular groove is divided into a plurality of arc-shaped grooves, and all the arc-shaped grooves are arranged in a ring shape and adjacent arc-shaped grooves are arranged by reinforcing ribs.

[0036] Preferably, the reinforcing ribs, the shell, the annular plate and the panel are integrally formed to facilitate installation and molding, reduce installation procedures and reduce costs.

[0037] Preferably, the first annular groove is arranged with a third annular groove inside.

[0038] Preferably, the first annular groove is arranged with a third annular groove outside.

[0039] Preferably, the first annular groove is arranged with a third annular groove inside and outside.

[0040] The first annular groove and the third annular groove are matched to control the residual vibration and the ultrasonic echo energy.

[0041] Preferably, the bottom of the first annular groove is further provided with a bottom groove.

[0042] The first annular groove and the third annular groove are matched to control the residual vibration and the ultrasonic echo energy.

[0043] Preferably, the bottom groove and a part of the side of the first annular groove are arranged in the same plane.

[0044] Preferably, along the radial direction of the first annular groove, the bottom groove is arranged in the middle of the bottom of the first annular groove.

[0045] Preferably, at least a part of the side of the first annular groove extends to the panel.

[0046] Preferably, the outer side of the panel protrudes the end face of the corresponding side of the shell. After the sound wave passes through the convex interface, it is diffused outward along the central axis, so that the sound wave emission angle is wider, the near-field area sound field is uniform, suitable for large-range target detection, and the detection angle is also increased.

[0047] Preferably, the outer side of the panel has an arc surface part which is arranged outwardly convex towards the outer side of the panel. It can increase the ultrasonic wave emission and acceptance angle, and the sound wave behavior is strong emission, which can meet the needs in some scenes, such as when a larger detection angle is required, to achieve the effect of wide coverage in the near field.

[0048] Preferably, the outer side of the panel has a curved surface part, which is concave towards the inner side of the panel. It forces the sound wave energy to propagate along the normal direction of the concave surface and converge, the directivity becomes narrower, the beam angle becomes smaller, and it meets the requirements in some scenarios, such as greatly improving the local energy intensity, and the higher the frequency, the shorter the wavelength, and the stronger the focusing ability.

[0049] Preferably, the projection of the inner side of the panel on the outer shell is located on the side of the first annular groove.

[0050] Preferably, the outer shell is cylindrical.

[0051] In a second aspect, the present application provides an ultrasonic sensor, which comprises the ultrasonic sensor shell as described in the present application, and the panel is connected to the piezoelectric ceramic sheet, and the panel is used as a matching layer for the piezoelectric ceramic sheet to transmit vibration.

[0052] The present application provides an ultrasonic sensor, which comprises the ultrasonic sensor shell as described in the present application, and the ultrasonic sensor shell comprises an outer shell, the inner side of one end of the outer shell has an annular plate, the inner side of the annular plate is provided with a panel, and the outer shell, the annular plate and the panel are integrally formed, so that the outer shell, the annular plate and the panel form an integral whole. Since the inner and outer shells and the matching layer of the traditional ultrasonic sensor are separately manufactured, the secondary assembly of the outer shell, the annular plate and the panel is required during the production of the sensor, which not only has a complex structure and a complicated process, but also is easily affected by the assembly tolerance during the assembly process, resulting in poor consistency of the product. The ultrasonic sensor shell of the present application has an integrated arrangement of the outer shell, the annular plate and the panel. During the production of the sensor, the piezoelectric ceramic sheet is connected to the panel, and the panel is used as a matching layer for the piezoelectric ceramic sheet to transmit signals, so as to realize the coupling of the shell with the piezoelectric ceramic sheet, and thus the matching layer is no longer needed, greatly simplifying the process flow,

[0053] Further, a first annular groove is arranged on the outer side of the annular plate, which, under the cooperation of a specific acoustic bucket structure, regulates the signal energy, so that the detection range of the ultrasonic sensor made thereafter is relatively increased, and at the same time, the acoustic wave propagation is restricted to some extent, so that the ultrasonic sensor can still meet the use requirements after the ultrasonic sensor shell is improved as described above.

[0054] In a third aspect, the present application provides an ultrasonic sensor, which comprises the ultrasonic sensor shell as described in the present application, and further comprises a piezoelectric ceramic sheet, a damping layer, a backing layer, a terminal wire and a potting layer, the piezoelectric ceramic sheet and the backing layer are arranged in the inner shell in sequence, and the piezoelectric ceramic sheet is connected to the panel.

[0055] The damping layer is also filled between the inner shell and the outer shell, and the outer shell is filled with the potting layer away from the end of the panel;

[0056] The terminal wire passes through the potting layer and the backing layer and is connected with the lead-out wire of the piezoelectric ceramic sheet.

[0057] The ultrasonic sensor provided by the application sequentially sets the piezoelectric ceramic sheet and the backing layer in the inner shell during production, and the piezoelectric ceramic sheet is connected to the panel, and the panel is used as a matching layer for signal transmission of the piezoelectric ceramic sheet, so that the piezoelectric ceramic sheet is coupled with the shell, and thus an additional matching layer is no longer needed, which greatly simplifies the process flow, and meanwhile, due to the integrated setting of the inner shell and the outer shell, a small plastic shell is no longer needed for positioning of the piezoelectric ceramic sheet, and assembly tolerance that is prone to occur when two outer shells are assembled is also avoided, which greatly improves the production efficiency of the ultrasonic sensor.

[0058] Preferably, the backing layer and the damping layer are integrally poured.

[0059] In a fourth aspect, the application provides an ultrasonic sensor, which comprises the ultrasonic sensor shell provided by the application, and further comprises a piezoelectric ceramic sheet, a damping layer, a backing layer and a terminal wire, the piezoelectric ceramic sheet is connected to the inner side of the panel, the damping layer is located in the third annular groove, and the backing layer is arranged on the inner side of the outer shell.

[0060] The inner side of the outer shell is also filled with a potting layer, and the potting layer is located on the side of the backing layer away from the piezoelectric ceramic sheet.

[0061] The terminal wire passes through the potting layer and enters the backing layer, and is connected with the lead-out wire of the piezoelectric ceramic sheet.

[0062] The ultrasonic sensor provided by the application sequentially sets the piezoelectric ceramic sheet and the backing layer in the inner side of the outer shell during production, and the piezoelectric ceramic sheet is connected to the panel, and the panel is used as a matching layer for signal transmission of the piezoelectric ceramic sheet, so that the piezoelectric ceramic sheet is coupled with the shell, and thus an additional matching layer is no longer needed, which greatly simplifies the process flow, and meanwhile, due to the integrated setting of the inner shell and the outer shell, a small plastic shell is no longer needed for positioning of the piezoelectric ceramic sheet, and assembly tolerance that is prone to occur when two outer shells are assembled is also avoided, which greatly improves the production efficiency of the ultrasonic sensor.

[0063] Preferably, the backing layer and the damping layer are integrally poured.

[0064] Preferably, the ultrasonic sensor further comprises a sound bucket, the sound bucket is arranged on the outer side of the panel, and the sound bucket is connected with at least one of the annular plate and the panel.

[0065] Compared with the prior art, the utility model discloses the beneficial effects of

[0066] The ultrasonic sensor shell provided by the application has the following advantages: the inside of one end of the shell is provided with an annular plate, the inside of the annular plate is provided with a panel, and the shell, the annular plate and the panel are integrally formed, so that the shell, the annular plate and the panel form an integral whole, the shell and the matching layer of the conventional ultrasonic sensor are separately manufactured, and the shell and the matching layer need to be assembled again when the sensor is produced, which not only has a complex structure and a complicated process, but also is easily affected by assembly tolerance during the assembling process, thereby leading to poor consistency of the product, the shell, the annular plate and the panel of the ultrasonic sensor shell are integrally arranged, the piezoelectric ceramic sheet is connected to the panel when the sensor is produced, the panel is used as the matching layer for signal transmission of the piezoelectric ceramic sheet, so that the shell is coupled with the piezoelectric ceramic sheet, and the matching layer is no longer needed, thereby greatly simplifying the process flow. BRIEF DESCRIPTION OF DRAWINGS

[0067] Figure 1 is a schematic view of the ultrasonic sensor shell of the application Figure 1 (having an inner shell).

[0068] Figure 2 is a schematic view of the ultrasonic sensor shell of the application Figure 2 (having an inner shell).

[0069] Figure 3 is a sectional view of the ultrasonic sensor shell of the application (having an inner shell and a first groove).

[0070] Figure 4 is a size marking diagram of the inner shell, the annular plate and the panel (having an inner shell and a first groove).

[0071] Figure 5 is a schematic view of the ultrasonic sensor of the application.

[0072] Figure 6 is a sectional view of the ultrasonic sensor (having an inner shell).

[0073] Figure 7 is a sectional view of the ultrasonic sensor shell of the application (having an inner shell and no first groove).

[0074] Figure 8is a cross-sectional view of the ultrasonic sensor housing of the present application (with inner housing, inner housing is shorter).

[0075] Figure 9 is a cross-sectional view of the ultrasonic sensor housing of the present application (with first boss configuration).

[0076] Figure 10 is a perspective view of the ultrasonic sensor housing of the present application Figure 1 (with first boss configuration).

[0077] Figure 11 is a bottom view of the ultrasonic sensor housing of the present application (with first annular groove).

[0078] Figure 12 is a bottom view of the ultrasonic sensor housing of the present application (with arc-shaped groove).

[0079] Figure 13 is a cross-sectional view of the ultrasonic sensor housing of the present application (with third annular groove).

[0080] Figure 14 is a cross-sectional view of the ultrasonic sensor of the present application (without inner housing).

[0081] Figure 15 is a cross-sectional view of the ultrasonic sensor housing of the present application (with shallower placement slot).

[0082] Figure 15-1 is a cross-sectional view of the ultrasonic sensor housing of the present application (with deeper placement slot).

[0083] Figure 16 is a cross-sectional view of the ultrasonic sensor housing of the present application (form one of bottom groove).

[0084] Figure 17 is a cross-sectional view of the ultrasonic sensor housing of the present application Figure 16 (A portion of A is enlarged).

[0085] Figure 18 is a cross-sectional view of the ultrasonic sensor housing of the present application (form two of bottom groove).

[0086] Figure 19 is a cross-sectional view of the ultrasonic sensor housing of the present application Figure 18 (A portion of A is enlarged).

[0087] Figure 20 is a cross-sectional view of the ultrasonic sensor housing of the present application (with third annular groove).

[0088] Figure 21 is a cross-sectional view of the ultrasonic sensor housing of the present application (form three of bottom groove).

[0089] Figure 22 is a cross-sectional view of the ultrasonic sensor housing of the present applicationFigure 21 A part of the middle A enlarged view.

[0090] Figure 23 A cross-sectional view of the ultrasonic sensor housing of the present application (the inner side of the ring plate and the panel are flush).

[0091] Figure 24 A cross-sectional view of the ultrasonic sensor housing of the present application (the outer side of the panel protrudes the end surface of the corresponding side of the housing).

[0092] Figure 25 A cross-sectional view of the ultrasonic sensor housing of the present application (the arc surface part is outwardly convex).

[0093] Figure 26 A cross-sectional view of the ultrasonic sensor housing of the present application (the arc surface part is inwardly concave).

[0094] Figure 27 A schematic view of the ultrasonic sensor housing of the present application and the sound barrel. DETAILED DESCRIPTION

[0095] The utility model will be described in further detail below in combination with specific embodiments. However, this should not be understood as the scope of the above-mentioned subject matter of the utility model being limited to the following embodiments. Any technology realized based on the content of the utility model falls within the scope of the utility model.

[0096] In the description of the embodiments of the utility model, the orientation or position relationship terms such as "up", "down", "left", "right", "center", "inner", "outer", etc. appearing without special indication are based on the orientation or position relationship expressed in the drawings or the orientation or position relationship used when the product / device / apparatus 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 embodiments, so as to facilitate the quick understanding of the scheme by the technicians, and are not intended to indicate or imply that a specific device / part / element must have a specific orientation or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the utility model.

[0097] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding device / component / element is 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%, more preferably an error / deviation of ±6%, more preferably an error / deviation of ±5%, more preferably an error / deviation of ±4%. 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. In addition, the terms "first", "second", "third", and the like in the description of the embodiments of the utility model, are only used to distinguish the description of the same or similar parts, and should not be understood as emphasizing or implying the relative importance of the specific parts.

[0098] 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.

[0099] 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", "set", "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.

[0100] Embodiment 1

[0101] As shown in Figures 1-3 The ultrasonic sensor shell described in the embodiment comprises an inner shell 1, an outer shell 2 coaxial with the inner shell 1 is arranged on the outer side of the inner shell 1, an annular plate 3 is arranged between the top of the inner shell 1 and the outer shell 2, a panel 4 is arranged on one end of the inner shell 1 close to the annular plate 3, and the panel 4 is used to connect a piezoelectric ceramic sheet 5; the inner shell 1, the outer shell 2, the annular plate 3 and the panel 4 are integrally formed.

[0102] The inner shell 1 and the outer shell 2 are connected through the annular plate 3, the inner shell 1 is provided with the panel 4 at one end close to the annular plate 3, and the inner shell 1, the outer shell 2, the annular plate 3 and the panel 4 are integrally formed, so that the inner shell 1, the outer shell 2 and the panel 4 form an integral whole. Since the two kinds of shells and the matching layer of the traditional ultrasonic sensor are separately made, the two kinds of shells and the matching layer need to be assembled twice during the production of the sensor, which not only has a complex structure and a complicated process, but also the two kinds of shells are easily affected by the assembly tolerance during the assembly process, resulting in poor consistency of the product. The ultrasonic sensor shell of the present application has an integrated arrangement of the inner shell 1, the outer shell 2 and the panel 4. During the production of the sensor, the piezoelectric ceramic sheet 5 is connected to the panel 4, the panel 4 is used as the matching layer for the transmission of the signal of the piezoelectric ceramic sheet 5, so that the shell is used to couple with the piezoelectric ceramic sheet 5, and then the additional matching layer is no longer needed, which greatly simplifies the process flow. Further, due to the integrated arrangement of the inner shell 1 and the outer shell 2, the small plastic shell is no longer needed for positioning the piezoelectric ceramic sheet 5, and the assembly tolerance that easily occurs when the two kinds of shells are assembled is also avoided. The ultrasonic sensor shell of the present application has a simple process, effectively reduces the variable factors, reduces the difficulty of production quality control, and effectively improves the production efficiency of the traditional ultrasonic sensor.

[0103] In the present application, the integrally formed process of the inner shell 1, the outer shell 2, the annular plate 3 and the panel 4 preferably adopts an injection molding process or a machining process. Taking the injection molding process as an example, a convex-concave mold is prepared in advance to design the shape of the shell. The main component of the shell material is preferably epoxy resin, and fillers are added to the epoxy resin to reduce its density, so that the density range is 0.35 g / cm³~0.9 g / cm³, thereby ensuring the uniformity of the shell material. During the integrally formed process, the shell material in a semi-liquid state at room temperature is first poured into the concave mold, and then the convex-concave mold is locked and baked to solidify, thereby forming the ultrasonic sensor shell of the present application.

[0104] The ultrasonic sensor shell of the present application cancels the traditional outer shell and the embedded plastic shell, reduces the material cost, and solves the problem of complex structure and difficult quality control caused by too many variables of the traditional shell.

[0105] In one or more embodiments, the density of the panel 4 is 0.35 g / cm³~0.9 g / cm³, as shown in Figure 4 The thickness of the panel 4 directly affects the coupling frequency and impedance parameters of the piezoelectric ceramic sheet 5 after bonding with the shell, and the control range is 1.6 mm~3.0 mm.

[0106] In an optional embodiment, as shown in Figure 4As shown, the outer diameter of the inner shell 1 is b, and the outer diameter of the inner shell 1 affects the product vibration and the ultrasonic energy, and the control range is Φ8.2mm~Φ11mm.

[0107] Preferably, as shown, the thickness of the annular plate 3 is c, and different thicknesses of the annular plate 3 will cause residual vibration interference, and the thickness of the annular plate 3 is also directly related to the connection strength of the inner shell 1 and the outer shell 2, and the control range is 1mm~1.5mm. Figure 4

[0108] In one or more embodiments, as shown, a first accommodating cavity 10 is formed between the inner shell 1 and the panel 4, and the first accommodating cavity 10 is used to place the piezoelectric ceramic sheet 5, and as shown, Figure 3 Figure 6 .

[0109] The piezoelectric ceramic sheet 5 is placed in the first accommodating cavity 10, and the piezoelectric ceramic sheet 5 is bonded to the panel 4, the piezoelectric ceramic sheet 5 is accommodated through the first accommodating cavity 10, and the panel 4 is used as a matching layer of the piezoelectric ceramic sheet 5, without the need for embedding a small plastic shell to position the piezoelectric ceramic sheet 5, and without the need to set a matching layer, which simplifies the shell structure while ensuring that the piezoelectric ceramic sheet 5 can be used normally.

[0110] In an optional embodiment, as shown, a second accommodating cavity 20 is formed between the inner shell 1, the outer shell 2 and the annular plate 3. Figure 3 By filling the damping layer 6 in the second accommodating cavity 20, the effect of buffering the residual vibration of the piezoelectric ceramic sheet 5 is achieved, and as shown,

[0111] Figure 6 .

[0112] In an optional embodiment, as shown, the end of the inner shell 1 away from the panel 4 is located inside the outer shell 2, so that the inner shell 1 does not protrude from the outer shell 2, and in subsequent ultrasonic sensor assembly, it is convenient to fill the potting layer 9 at the end of the outer shell 2 to seal the inner shell 1, and as shown, Figure 3 Figure 6 .

[0113] In an optional embodiment, as shown, the end of the inner shell 1 away from the panel 4 is also provided with a first recess 11. By providing the first recess 11 at the end of the inner shell 1 away from the panel 4, it is convenient to clamp the terminal wire 8 in the first recess 11 during subsequent installation of the terminal wire 8, so as to fix the terminal wire 8, without the need to set a pin back cover as an intermediate connection part of the piezoelectric ceramic sheet 5 and the terminal wire 8, to realize the direct connection of the terminal wire 8 and the lead-out wire 30, and to simplify the structure of the ultrasonic sensor without affecting the function of the ultrasonic sensor, and as shown, Figure 1 Figure 6 .

[0114] ​​​​​In an optional embodiment, the annular plate 3 is flush with the panel 4. In an optional embodiment, the inner shell 1 is cylindrical.

[0115] In an optional embodiment, the inner shell 1 and the outer shell 2 are cylindrical structures, with the inner shell 1 located inside the cavity of the outer shell 2, and the annular plate 3 connecting the inner shell 1 and the outer shell 2 into a whole.

[0116] In an optional embodiment, the inner shell 1 includes at least two first boss structures 40, all of which are arranged circumferentially around the outer shell 2, and one end of each first boss structure 40 is connected to the panel 4 or the annular plate 3.

[0117] Example 2

[0118] like Figures 1-24 As shown, the ultrasonic sensor housing described in this embodiment includes an outer shell 2, an annular plate 3 on the inner side of one end of the outer shell 2, a panel 4 on the inner side of the annular plate 3, and the panel 4 for connecting a piezoelectric ceramic sheet 5. The outer shell 2, the annular plate 3 and the panel 4 are integrally formed, and a first annular groove 50 is provided on the outer side of the annular plate 3.

[0119] The ultrasonic sensor housing described in this application includes an outer shell 2, an annular plate 3 on the inner side of one end of the outer shell 2, and a panel 4 disposed on the inner side of the annular plate 3. The outer shell 2, the annular plate 3, and the panel 4 are integrally formed, thereby making the outer shell 2, the annular plate 3, and the panel 4 a whole. Since the outer shell and the matching layer of traditional ultrasonic sensors are manufactured separately, secondary assembly of the outer shell and the matching layer is required during sensor production. This is not only structurally complex and cumbersome, but also easily affected by assembly tolerances during the assembly process, resulting in poor product consistency. However, the ultrasonic sensor housing of this application, with the outer shell 2, the annular plate 3, and the panel 4 being integrally set, allows the piezoelectric ceramic sheet to be connected to the panel during sensor production. The panel 4 is used as the matching layer for the piezoelectric ceramic sheet to transmit signals, thereby realizing the coupling between the housing and the piezoelectric ceramic sheet. This eliminates the need for an additional matching layer and greatly simplifies the process.

[0120] Furthermore, a first annular groove 50 is provided on the outer side of the annular plate 3. With the cooperation of a specific acoustic barrel structure, the signal energy level is adjusted, which increases the detection range of the ultrasonic sensor after it is made, and at the same time, it plays a certain role in constraining the propagation of sound waves. Thus, the ultrasonic sensor can still meet the usage requirements after the ultrasonic sensor housing is improved as described above.

[0121] like Figure 27 As shown, in a preferred embodiment, the specific sound barrel structure is preferably, for example, a horn-shaped sound barrel 80 or a hollow cone-shaped structure.

[0122] In a preferred mode, the panel 4 is bonded on one side with a piezoelectric ceramic sheet 5.

[0123] In the present application, the housing 2, the annular plate 3 and the panel 4 are integrally formed by a process, preferably an injection molding process. In the case of an injection molding process, a male-female mold is prepared in advance to design the shape of the housing. The main component of the material of the housing is preferably epoxy resin, and fillers are added to the epoxy resin to reduce its density, so that the density of the housing material is in the range of 0.35 g / cm3 to 0.9 g / cm3, thereby ensuring the uniformity of the housing material. During the integrally forming process, the housing material in a semi-liquid state at room temperature is first poured into the female mold, and then the male-female mold is locked and baked to solidify, thereby forming the ultrasonic sensor housing of the present application.

[0124] The ultrasonic sensor housing of the present application eliminates the traditional outer shell and embedded plastic shell, thereby reducing the material cost and solving the problem of difficult quality control caused by the complex structure and many variables of the traditional housing.

[0125] As shown in Figure 4 In one or more embodiments, the panel 4 has a preferred density of 0.35 g / cm3 to 0.9 g / cm3, and the thickness of the panel 4 is a, and the preferred size of a is 1.6 mm to 3.0 mm.

[0126] The thickness of the panel 4 directly affects the coupling frequency and impedance parameters after the piezoelectric ceramic sheet 5 is bonded to the panel 4, and the control range is preferably 1.6 mm to 3.0 mm.

[0127] In a preferred mode, the ultrasonic sensor housing of the present application further comprises an inner shell 1, the outer shell 2 is sleeved on the outer side of the inner shell 1, and the inner shell 1 is connected to at least one of the annular plate 3 and the panel 4. The inner shell 1 is used to protect the structure on the inner side of the outer shell 2 and facilitate assembly.

[0128] Preferably, the inner shell 1, the outer shell 2, the annular plate 3 and the panel 4 are integrally formed.

[0129] The inner shell 1, the outer shell 2, the annular plate 3 and the panel 4 are integrally formed, so that the inner shell 1, the outer shell 2 and the panel 4 form an integral whole. Since the two shells and the matching layer of the conventional ultrasonic sensor are separately manufactured, the two shells and the matching layer need to be assembled again during the production of the sensor. The structure is complex, the process is complicated, and the two shells are easily affected by the assembly tolerance during the assembly process, resulting in poor consistency of the product. The ultrasonic sensor shell of the present application integrally provides the inner shell 1, the outer shell 2 and the panel 4. During the production of the sensor, the piezoelectric ceramic sheet 5 is connected to the panel 4, and the panel 4 is used as the matching layer for the transmission of the signal of the piezoelectric ceramic sheet 5. Thus, the shell is used to couple with the piezoelectric ceramic sheet 5, and no additional matching layer is needed, greatly simplifying the process flow. Further, since the inner shell 1 and the outer shell 2 are integrally provided, the small plastic shell for positioning the piezoelectric ceramic sheet 5 is no longer needed, and the assembly tolerance that occurs when the two shells are assembled is also avoided. The ultrasonic sensor shell of the present application has a simple process, effectively reduces variable factors, reduces the difficulty of production quality control, and effectively improves the production efficiency of the conventional ultrasonic sensor.

[0130] In the present application, the integrally forming process of the inner shell 1, the outer shell 2, the annular plate 3 and the panel 4 adopts an injection molding process. The convex-concave mold is made in advance to design the shape of the shell. The main component of the shell material is epoxy resin, and fillers are added to the epoxy resin to reduce its density, so that the density range is 0.35 g / cm³~0.9 g / cm³, thereby ensuring the uniformity of the shell material. During the integrally forming process, the shell material in a semi-liquid state at room temperature is first poured into the concave mold, and then the convex-concave mold is locked and baked to solidify, thereby forming the ultrasonic sensor shell of the present application.

[0131] In a preferred embodiment, the inner shell 1 and the outer shell 2 are coaxially arranged to ensure the coaxiality of the inner shell and the outer shell, and to ensure the symmetry of the ultrasonic sensor shell vibration and the uniform transmission of ultrasonic waves.

[0132] In a preferred embodiment, as shown in Figure 4 The outer diameter of the inner shell 1 is b. The outer diameter of the inner shell 1 affects the product vibration and the size of the ultrasonic energy, and its control range is Φ8.2mm~Φ11mm.

[0133] In a preferred embodiment, as shown in Figure 4 The thickness of the annular plate 3 is c. Different thicknesses of the annular plate 3 can cause residual vibration interference, and the thickness of the annular plate 3 also relates to the connection strength of the inner shell 1 and the outer shell 2. Its control range is 1mm~1.5mm.

[0134] As shown in Figure 3As shown in the drawings, in one or several embodiments, a first accommodating cavity 10 is formed between the inner shell 1 and the panel 4, and Figure 6 As shown, the first accommodating cavity 10 is used to place the piezoelectric ceramic sheet 5.

[0135] The piezoelectric ceramic sheet 5 is placed in the first accommodating cavity 10, and the piezoelectric ceramic sheet 5 is bonded to the panel 4. The piezoelectric ceramic sheet 5 is accommodated through the first accommodating cavity 10, and the panel 4 is used as the matching layer of the piezoelectric ceramic sheet 5. The positioning of the piezoelectric ceramic sheet 5 does not require a small plastic shell to be embedded, and a matching layer does not need to be additionally arranged. The shell structure is simplified while ensuring that the piezoelectric ceramic sheet 5 can be normally used.

[0136] A preferred embodiment is as shown in the drawings, Figure 3 and 6 A second accommodating cavity 20 is formed between the inner shell 1, the outer shell 2 and the annular plate 3, and the damping layer is accommodated through the second accommodating cavity 20, thereby improving the size of the residual vibration of the piezoelectric ceramic sheet 5.

[0137] A preferred embodiment is as shown in the drawings, Figure 3 and 6 The end of the inner shell 1 away from the panel 4 is located inside the outer shell 2, so that the inner shell 1 does not protrude out of the outer shell 2. When the ultrasonic sensor is assembled subsequently, the end of the outer shell 2 is filled with a filling and sealing layer 9 to seal the inner shell 1.

[0138] A preferred embodiment is as shown in the drawings, Figure 1 The end of the inner shell 1 away from the panel 4 is further provided with a first recess 11. By further providing the end of the inner shell 1 away from the panel 4 with the first recess 11, the terminal wire 8 is clamped in the first recess 11 when the terminal wire 8 is installed subsequently, thereby fixing the terminal wire 8. A pin back cover does not need to be additionally arranged as the intermediate connection part of the lead-out wire 30 and the terminal wire 8, and the direct connection of the terminal wire 8 and the lead-out wire 30 is achieved. The structure of the ultrasonic sensor is simplified without affecting the function of the ultrasonic sensor, as shown in the drawings, Figure 6 .

[0139] The first recess 11 is preferably at least two, and all the first recesses 11 are circumferentially arranged along the inner shell 1.

[0140] A preferred embodiment is that the inner shell 1 is cylindrical. If it does not have the first recess 11, the Z-axis vibration is small, the vibration of the product end surface is relatively weak, more energy is concentrated to the rear end, the rear end vibrates greatly, if the first recess 11 exists, the ultrasonic sensor made after the vibration along the Z-axis is large, the vibration of the product end surface is stronger, more energy transmission can be generated, and the residual vibration is smaller.

[0141] The outer diameter of the inner shell is preferably Φ8.2mm-Φ11mm.

[0142] As shown in Figure 9 and 10 A preferred embodiment, the inner shell 1 comprises at least two first boss structure 40, all of the first boss structure 40 is arranged circumferentially spaced along the outer shell 2, one end of the first boss structure 40 is connected with at least one of the panel 4 and the annular plate 3.

[0143] Since all of the first boss structure 40 is arranged circumferentially spaced along the outer shell 2, so that the ultrasonic sensor after making along the Z axis vibration is large, the product end surface vibration is stronger, more can produce energy transfer, the residual vibration is smaller.

[0144] A preferred embodiment, the outer shell 2 is cylindrical.

[0145] A preferred embodiment, the outer shell 2, the annular plate 3 and the panel 4 form a closed end cavity 21. That is, the outer shell 2, the annular plate 3, the panel 4, the connection between the annular plate 3 and the outer shell 2, the connection between the annular plate 3 and the panel 4 are not provided with through hole.

[0146] A preferred embodiment, the panel 4 inside the side is provided with a solder point containing groove 41, for containing the solder point on the piezoelectric ceramic sheet 5, while being used for positioning the piezoelectric ceramic sheet 5.

[0147] A preferred embodiment, the solder point containing groove 41 extends partially to the annular plate 3.

[0148] As shown in Figure 13 A preferred embodiment, the annular plate 3 inside the side is provided with a second annular groove 60. The area of the panel in contact with the piezoelectric ceramic sheet is adjusted by the second annular groove 60, so as to adjust the residual vibration size of the ultrasonic sensor, further, the third annular groove can be used to fill the elastic glue, to suppress the vibration of the piezoelectric ceramic sheet towards the outer shell direction, or to fill the backing glue to form part of the backing layer, to better reduce the vibration.

[0149] As shown in Figure 13 A preferred embodiment, the second annular groove 60 is provided corresponding to the first annular groove 50, so as to jointly control the thickness of the annular plate 3, to reduce the influence of the annular plate 3 on the vibration of the panel 4.

[0150] As shown in Figure 23 A preferred embodiment, the annular plate 3 and the panel 4 inside the side are flush.

[0151] A preferred embodiment, the inner shell 1 and the outer shell 2 are cylindrical structure, the inner shell 1 is located in the inner cavity of the outer shell 2, and the annular plate 3 connects the inner shell 1 and the outer shell 2 into a whole.

[0152] As Figure 15 and 15-1 shown, a preferred embodiment, the inner side of the ring plate 3 is higher than the inner side of the panel 4, the ring plate 3 and the inner side of the panel 4 form a placement groove 42 for placing the piezoelectric ceramic sheet 5, the placement groove 42 is used for placing the piezoelectric ceramic sheet 5.

[0153] As Figure 12 shown, preferably, the first annular groove 50 is connected between the opposite sides of the first annular groove 50.

[0154] As Figure 12 shown, a preferred embodiment, the reinforcing rib 54 is at least two, the adjacent reinforcing ribs 54 are arranged at intervals, and the reinforcing rib 54 divides the first annular groove 50 into a plurality of arc-shaped grooves 51.

[0155] Specifically preferably, the reinforcing rib 54 is arranged so that the first annular groove 50 is divided into a plurality of arc-shaped grooves 51, and all the arc-shaped grooves 51 are arranged in a ring shape, and the adjacent arc-shaped grooves 51 are arranged at intervals by the reinforcing rib 54.

[0156] A preferred embodiment, the reinforcing rib 54, the shell 2, the ring plate 3 and the panel 4 are integrally formed.

[0157] A preferred embodiment, the inner side of the first annular groove 50 is arranged at intervals with a third annular groove 52.

[0158] A preferred embodiment, the outer side of the first annular groove 50 is arranged at intervals with a third annular groove 52.

[0159] A preferred embodiment, the inner side and the outer side of the first annular groove 50 are arranged at intervals with a third annular groove 52.

[0160] By cooperation of the first annular groove 50 and the third annular groove 52, the residual vibration and ultrasonic echo energy are controlled.

[0161] A preferred embodiment, the bottom of the first annular groove 50 is further provided with a bottom groove 53.

[0162] Preferably, the bottom groove 53 and a part of the side of the first annular groove 50 are arranged in the same plane.

[0163] A preferred embodiment, along the radial direction of the first annular groove 50, the bottom groove 53 is arranged in the middle of the bottom of the first annular groove 50.

[0164] A preferred embodiment, at least a part of the side of the first annular groove 50 extends to the panel 4.

[0165] A preferred embodiment, the panel 4 outer side face protrudes the end face of the corresponding side of the shell 2. After the sound wave spreads outwards along the central axis, the sound wave transmission angle is wider, the near-field area sound field is uniform, suitable for large range target detection, and the detection angle is also increased.

[0166] A preferred embodiment, the panel 4 outer side face has an arc surface part 43, which is outwardly convex towards the outer side of the panel 4. For convex setting, the ultrasonic wave transmission and acceptance angle is increased, and the sound wave behavior is strong emission. It is suitable for some scenarios, such as when a larger detection angle is required, to achieve the effect of wide coverage in the near field.

[0167] A preferred embodiment, the panel 4 outer side face has an arc surface part 43, which is inwardly concave towards the inner side of the panel 4. For concave setting, the sound wave energy is forced to propagate along the normal direction of the concave surface and converge, the directivity is narrowed, and the beam angle is smaller. It can meet some user needs, greatly improve the local energy intensity, and the higher the frequency, the shorter the wavelength, and the stronger the focusing ability.

[0168] A preferred embodiment, the projection of the inner side face of the panel 4 is located on the side of the first annular groove 50 along the radial direction of the shell 2. A preferred embodiment, the shell 2 is cylindrical. A preferred embodiment, at least part of the first annular groove 50 extends laterally to the panel 4.

[0169] Embodiment 3

[0170] Based on embodiment 1, as shown in Figures 5-6 , the ultrasonic sensor of the present embodiment comprises a piezoelectric ceramic sheet 5, a damping layer 6, a backing layer 7, a terminal wire 8, a potting layer 9, and a shell structure as described in embodiment 1. The piezoelectric ceramic sheet 5 and the backing layer 7 are arranged in the inner shell 1 in sequence, and the piezoelectric ceramic sheet 5 is connected to the panel 4.

[0171] The inner shell 1 and the outer shell 2 are also filled with a damping layer 6, and the end of the outer shell 2 away from the panel 4 is filled with a potting layer 9.

[0172] The terminal wire 8 passes through the potting layer 9 and the backing layer 7 and is connected to the lead wire 30 of the piezoelectric ceramic sheet 5.

[0173] In production, the piezoelectric ceramic sheet 5 and the backing layer 7 are sequentially arranged inside the inner shell 1, and the piezoelectric ceramic sheet 5 is connected to the panel 4 as a matching layer for transmitting signals of the piezoelectric ceramic sheet 5, so as to realize coupling with the piezoelectric ceramic sheet 5 by the shell, and thus no additional matching layer is needed, which greatly simplifies the process flow. At the same time, due to the integrated arrangement of the inner shell 1 and the outer shell 2, the small plastic shell for positioning the piezoelectric ceramic sheet 5 is no longer needed, and the assembly tolerance easily occurring when assembling the two shells is also avoided, which greatly improves the production efficiency of the ultrasonic sensor.

[0174] Preferably, as shown in Figure 6 The backing layer 7 and the damping layer 6 are integrally casted, which realizes reducing the process and increasing the efficiency.

[0175] The embodiment also discloses a production method of the ultrasonic sensor, and the specific steps are as follows: (1) preparing shell material; (2) filling the shell material into a concave mold by using a precise dispensing machine, and the glue amount is controlled by dispensing air pressure and dispensing time; (3) welding the lead wire 30 of the piezoelectric ceramic sheet 5, and the welding uses a professional laser welding device, and the lead wire 30 is a silver-plated copper wire; (4) preassembling the piezoelectric ceramic sheet 5 with the welded lead wire 30 on a convex mold platform and performing negative pressure adsorption; (5) then locking the convex mold and the concave mold, baking for a certain time for curing, and then demolding; (6) demolding, separating the convex mold and the concave mold by using a mechanical claw hand, and taking out the sensor shell; (7) welding the external terminal wire 8 and the lead wire 30 of the piezoelectric ceramic sheet 5; (8) filling the backing glue into the inner shell 1 by using the precise dispensing machine to form the backing layer 7, and the glue amount is controlled by dispensing air pressure and dispensing time; (9) filling the potting glue into the outer shell 2 by using the precise dispensing machine to form the potting layer 9, and the glue amount is controlled by dispensing air pressure and dispensing time, and the ultrasonic sensor is completed. The lead wire 30 includes a positive electrode wire 81 and a negative electrode wire 82.

[0176] The ultrasonic sensor described in the embodiment is preferably used for material identification and distance measurement.

[0177] Embodiment 4

[0178] As Figures 5-6As shown, the ultrasonic sensor described in the embodiment comprises the ultrasonic sensor shell described in Embodiment 1 or 2. The ultrasonic sensor shell comprises a shell, one end of the shell has a ring-shaped plate inside, the ring-shaped plate is provided with a panel inside, and the shell, the ring-shaped plate and the panel are integrally formed, so that the shell, the ring-shaped plate and the panel form an integral whole. Since the inner shell, the outer shell and the matching layer of the traditional ultrasonic sensor are separately made, the secondary assembly of the shell, the ring-shaped plate and the panel is required during the production of the sensor, which not only has a complex structure and a complicated process, but is also easily affected by assembly tolerance during the assembly process, resulting in poor consistency of the product. The ultrasonic sensor shell of the present application integrally provides the shell, the ring-shaped plate and the panel. During the production of the sensor, the piezoelectric ceramic sheet is connected to the panel, the panel is used as the matching layer for the transmission of the signal of the piezoelectric ceramic sheet, so that the shell is used to couple with the piezoelectric ceramic sheet, and thus an additional matching layer is no longer needed, greatly simplifying the process flow,

[0179] Further, a first annular groove is arranged outside the ring-shaped plate to increase the emission angle and the receiving angle of the signal, so that the detection range of the ultrasonic sensor made thereafter is relatively increased, and the sound waves are focused to some extent, so that the ultrasonic sensor can still meet the use requirements after the ultrasonic sensor shell is improved as described above.

[0180] Further, since the shell 2, the ring-shaped plate 3 and the panel 4 are integrally arranged, the small plastic shell for positioning the piezoelectric ceramic sheet 5 is no longer needed, and the assembly tolerance that easily occurs when the two shells are assembled is also avoided. The ultrasonic sensor shell of the present application has a simple process, effectively reduces variable factors, reduces the difficulty of production quality control, and effectively improves the production efficiency of the traditional ultrasonic sensor.

[0181] In the present application, the integrally forming process of the shell 2, the ring-shaped plate 3 and the panel 4 adopts an injection molding process, and a convex-concave mold is made in advance to design the shape of the shell. The main component of the shell material is epoxy resin, and fillers are added to the epoxy resin to reduce its density, so that the density range is 0.35g / cm³~0.9g / cm³, thereby ensuring that the uniformity of the shell material is guaranteed. During integrally forming, the shell material in a semi-liquid state at room temperature is first poured into the concave mold, and then the convex-concave mold is locked and baked to solidify, thereby forming the ultrasonic sensor shell described in the present application.

[0182] The ultrasonic sensor shell of the present application cancels the traditional shell and the embedded plastic shell and other supporting shells, reduces the material cost, and solves the problem of difficult quality control caused by the complex structure and many variables of the traditional shell.

[0183] In one or several embodiments, the density of the panel 4 is 0.35g / cm3~0.9g / cm3, as shown in the formula (1), and the thickness of the panel 4 is a, the size of a is 1.6mm~3.0mm. The thickness of the panel 4 directly affects the coupling frequency and impedance parameters of the piezoelectric ceramic sheet 5 after being bonded with the shell, and its control range is 1.6mm~3.0mm. Figure 4 As shown in the formula (2), the thickness of the ring plate 3 is c, and different thicknesses of the ring plate 3 will cause residual vibration interference, and the thickness of the ring plate 3 is also related to the connection strength of the inner shell 1 and the outer shell 2, and its control range is 1mm~1.5mm.

[0184] As shown in the formula (2), the thickness of the ring plate 3 is c, and different thicknesses of the ring plate 3 will cause residual vibration interference, and the thickness of the ring plate 3 is also related to the connection strength of the inner shell 1 and the outer shell 2, and its control range is 1mm~1.5mm. Figure 4

[0185] The piezoelectric ceramic sheet 5 is bonded on the panel 4, and the piezoelectric ceramic sheet 5 is accommodated through the first accommodating cavity 10, and the panel 4 is used as the matching layer of the piezoelectric ceramic sheet 5, without the need of embedding a small plastic shell for positioning the piezoelectric ceramic sheet 5, and without the need of setting a matching layer, which simplifies the shell structure while ensuring the normal use of the piezoelectric ceramic sheet 5.

[0186] The ultrasonic sensor described in the embodiment is preferably used for material identification and distance measurement.

[0187] Embodiment 5

[0188] As shown in the formula (2), the thickness of the ring plate 3 is c, and different thicknesses of the ring plate 3 will cause residual vibration interference, and the thickness of the ring plate 3 is also related to the connection strength of the inner shell 1 and the outer shell 2, and its control range is 1mm~1.5mm. Figures 5-6 The ultrasonic sensor described in the embodiment includes the ultrasonic sensor shell described in embodiment 2, and further includes a piezoelectric ceramic sheet 5, a damping layer 6, a backing layer 7 and a terminal wire 8, which is different from embodiments 3 or 4 in that the piezoelectric ceramic sheet 5 is connected to the inner side of the panel 4, the damping layer 6 is located in the second annular groove 60, and the backing layer 7 is arranged on the inner side of the outer shell 2.

[0189] The inner side of the outer shell 2 is further filled with a potting layer 9, and the potting layer 9 is located on the side of the backing layer 7 away from the piezoelectric ceramic sheet 5.

[0190] The terminal wire 8 enters the backing layer 7 after passing through the potting layer 9, and is connected with the lead wire 30 of the piezoelectric ceramic sheet 5.

[0191] The inner side of the ring plate 3 is provided with a second annular groove 60, and the area of the panel in contact with the piezoelectric ceramic sheet is adjusted through the second annular groove 60, so as to adjust the size of the residual vibration of the ultrasonic sensor, and further, the second annular groove 60 is used to fill elastic glue to suppress the vibration of the piezoelectric ceramic sheet towards the outer shell, and can also fill the backing glue to form part of the backing layer, and better damping.

[0192] ​The ultrasonic sensor described in the present application is produced by sequentially arranging the piezoelectric ceramic sheet 5 and the backing layer 7 inside the shell 2, and connecting the piezoelectric ceramic sheet 5 to the panel 4, which acts as a matching layer for the piezoelectric ceramic sheet 5 to transmit signals, so as to realize the coupling of the piezoelectric ceramic sheet 5 with the shell, and thus no additional matching layer is needed, which greatly simplifies the process flow. At the same time, since the shell 2, the annular plate 3 and the panel 4 are integrally formed, there is no need to embed a small plastic shell for positioning the piezoelectric ceramic sheet, and the assembly tolerance that easily occurs when assembling two shells is also avoided, which greatly improves the production efficiency of the ultrasonic sensor. Alternatively, the piezoelectric ceramic sheet 5 and the backing layer 7 are sequentially arranged inside the inner shell 1, and the piezoelectric ceramic sheet 5 is connected to the panel 4, which acts as a matching layer for the piezoelectric ceramic sheet 5 to transmit signals, so as to realize the coupling of the piezoelectric ceramic sheet 5 with the shell, and thus no additional matching layer is needed, which greatly simplifies the process flow. At the same time, since the shell 2, the annular plate 3 and the panel 4 are integrally formed, there is no need to embed a small plastic shell for positioning the piezoelectric ceramic sheet 5, and the assembly tolerance that easily occurs when assembling two shells is also avoided, which greatly improves the production efficiency of the ultrasonic sensor.

[0193] In an optional embodiment, as shown in Figure 6 The backing layer 7 and the damping layer 6 are integrally casted, which realizes the effect of reducing processes and increasing efficiency.

[0194] The present embodiment also discloses a production method of the ultrasonic sensor, and the specific steps are as follows: a. preparing shell material; b. pouring the shell material into the concave mold by using a precision dispensing machine, and controlling the glue amount by dispensing air pressure and dispensing time; c. welding the lead wire 30 of the piezoelectric ceramic sheet 5, and using professional laser welding equipment for welding, and the lead wire 30 is made of silver-plated copper wire; d. preassembling the piezoelectric ceramic sheet 5 with the welded lead wire 30 on the convex mold platform and negative pressure adsorption; e. then locking the convex and concave molds, baking for a certain time for curing, and then demolding; f. demolding, separating the convex and concave molds by using a mechanical claw hand, and taking out the ultrasonic sensor shell; g. welding the external terminal wire 8 with the lead wire 30 of the piezoelectric ceramic sheet 5; h. pouring the backing glue into the inner shell 1 by using a precision dispensing machine to form the backing layer 7, and controlling the glue amount by dispensing air pressure and dispensing time; i. pouring the potting glue into the outer shell 2 by using a precision dispensing machine to form the potting layer 9, and controlling the glue amount by dispensing air pressure and dispensing time, and completing the production of the ultrasonic sensor.

[0195] The ultrasonic sensor described in the present embodiment is preferably used for material identification and distance measurement.

[0196] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An ultrasonic sensor housing, characterized by, The shell (2) has a ring-shaped plate (3) on one end, and the ring-shaped plate (3) has a panel (4) on the inner side, which is used to connect the piezoelectric ceramic sheet (5), and the shell (2), ring-shaped plate (3) and panel (4) are integrally formed.

2. An ultrasonic sensor housing according to claim 1, characterized in that The inner shell (1) is coaxially arranged with the shell (2).

3. An ultrasonic sensor housing according to claim 2, wherein, 5. The ultrasonic sensor shell of claim 2, wherein, 4. An ultrasonic sensor housing according to claim 3, wherein, The first accommodating cavity is formed between the inner shell (1) and the panel (4), and is used to place the piezoelectric ceramic sheet (5). And / or The second accommodating cavity is formed between the inner shell (1), shell (2) and ring-shaped plate (3). The end of the inner shell (1) away from the panel (4) is located on the inner side of the shell (2). The end of the inner shell (1) away from the panel (4) is further provided with a first groove.

6. An ultrasonic sensor housing according to claim 2, wherein, 8. The ultrasonic sensor shell of claim 2, wherein, 7. An ultrasonic sensor housing according to claim 2, wherein, The inner shell (1) is cylindrical. And / or, The shell (2) is cylindrical. The inner shell (1) comprises at least two first boss structures, all of which are arranged circumferentially along the shell (2) and connected to at least one of the panel (4) and the ring-shaped plate (3). The shell (2), ring-shaped plate (3) and panel (4) form an inner cavity with a closed end.

9. An ultrasonic sensor housing according to claim 2, wherein, 11. The ultrasonic sensor shell of claim 1, wherein, 10. An ultrasonic sensor housing according to claim 1, wherein, The density of the panel (4) is 0.35g / cm³-0.9g / cm³. And / or, The thickness of the panel (4) is 1.6mm-3.0mm. The inner side of the ring-shaped plate (3) is provided with a second ring-shaped groove. The second ring-shaped groove is correspondingly arranged with the first ring-shaped groove.

12. An ultrasonic sensor housing according to claim 1, wherein, The inner side of the ring-shaped plate (3) and the inner side of the panel (4) are flush.

13. An ultrasonic sensor housing according to claim 12, characterized in that The inner side of the ring-shaped plate (3) is higher than the inner side of the panel (4), and the ring-shaped plate (3) and the inner side of the panel (4) form a placing groove for placing the piezoelectric ceramic sheet (5).

14. An ultrasonic sensor housing according to claim 1, wherein, The first ring-shaped groove is connected by a reinforcing rib between opposite sides.

15. An ultrasonic sensor housing according to claim 1, wherein, The reinforcing rib is at least two, and adjacent reinforcing ribs are arranged at intervals, and the reinforcing rib divides the first ring-shaped groove into several arc-shaped grooves.

16. An ultrasonic sensor housing according to claim 1, wherein, The reinforcing rib, shell (2), ring-shaped plate (3) and panel (4) are integrally formed.

17. An ultrasonic sensor housing according to claim 16, wherein, The first ring-shaped groove is further provided with a third ring-shaped groove at intervals on the inner side and / or the outer side.

18. An ultrasonic sensor housing according to claim 16, wherein, The bottom groove and a part of the side of the first ring-shaped groove are coplanar.

19. An ultrasonic sensor housing according to claim 1, wherein, ​ 20. An ultrasonic sensor housing according to claim 1, wherein, ​ 21. An ultrasonic sensor housing according to claim 20, wherein, ​ 22. An ultrasonic sensor housing according to claim 20, wherein, The bottom groove is arranged in the middle of the bottom of the first annular groove radially along the first annular groove.

23. An ultrasonic sensor housing according to claim 1, wherein, At least a part of the first annular groove extends laterally to the panel (4).

24. An ultrasonic sensor housing according to claim 1, wherein, The outer side of the panel (4) protrudes from the end surface of the corresponding side of the shell (2).

25. The ultrasonic sensor shell according to claim 1, wherein The outer side of the panel (4) has an arc surface part, which is arranged outwardly protruding towards the outer side of the panel (4); Or, The outer side of the panel (4) has an arc surface part, which is arranged inwardly recessed towards the inner side of the panel (4).

26. An ultrasonic sensor housing according to claim 1, wherein, The projection of the inner side of the panel (4) is located on the side of the first annular groove radially along the shell (2).

27. An ultrasonic sensor, characterized by The ultrasonic sensor shell according to any one of claims 1-26, wherein the panel (4) is connected to the piezoelectric ceramic sheet (5), and the panel (4) is used as a matching layer for transmitting vibration of the piezoelectric ceramic sheet (5).

28. An ultrasonic sensor, characterized by The ultrasonic sensor shell according to any one of claims 2-9, further comprising a piezoelectric ceramic sheet (5), a damping layer (6), a backing layer (7), a terminal wire (8), and a potting layer (9), wherein the piezoelectric ceramic sheet (5) and the backing layer (7) are arranged in the inner shell (1) in sequence, and the piezoelectric ceramic sheet (5) is connected to the panel (4). The inner shell (1) and the shell (2) are further filled with the damping layer (6), and the end of the shell (2) away from the panel (4) is filled with the potting layer (9). The terminal wire (8) passes through the potting layer (9) and the backing layer (7) and is connected to the lead wire of the piezoelectric ceramic sheet (5).

29. An ultrasonic sensor, characterized by The ultrasonic sensor shell according to claim 12 or 13, further comprising a piezoelectric ceramic sheet (5), a damping layer (6), a backing layer (7), and a terminal wire (8), wherein the piezoelectric ceramic sheet (5) is connected to the inner side of the panel (4), the damping layer (6) is located in the second annular groove, and the backing layer (7) is arranged in the inner side of the shell (2). The inner side of the shell (2) is further filled with a potting layer (9), and the potting layer (9) is located on the side of the backing layer (7) away from the piezoelectric ceramic sheet (5). The terminal wire (8) passes through the potting layer (9) and enters the backing layer (7), and is connected to the lead wire of the piezoelectric ceramic sheet (5).

30. The ultrasonic sensor according to claim 28 or 29, wherein The backing layer (7) and the damping layer (6) are integrally casted; And / or Further comprising an acoustic bucket, which is arranged on the outer side of the panel (4) and is connected to at least one of the annular plate (3) and the panel (4).

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