Sensor shell and ultrasonic sensor

Abstract

The utility model relates to the technical field of sensors, in particular to a sensor shell and an ultrasonic sensor, the sensor shell comprises an inner shell, an outer shell coaxial with the inner shell is arranged on the outer side of the inner shell, an annular plate is arranged between the top of the inner shell and the top of the outer shell, a panel is arranged at one end, close to the annular plate, of the inner shell, and the panel is used for being connected with a piezoelectric ceramic piece. The inner shell, the outer shell, the annular plate and the panel are integrally formed. The inner shell, the outer shell and the panel are integrally arranged, the piezoelectric ceramic piece is connected to the panel when the sensor is produced, the panel is used as a matching layer for transmitting signals of the piezoelectric ceramic piece, and therefore the shell is coupled with the piezoelectric ceramic piece, an additional matching layer does not need to be made any more, the technological process is greatly simplified, and the production cost is reduced. Due to the fact that the inner shell and the outer shell are integrally arranged, a small plastic shell does not need to be embedded to position the piezoelectric ceramic piece, assembly tolerance easily occurring when the two outer shells are assembled is avoided, variable factors are effectively reduced, and production quality control difficulty is lowered.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field, especially a kind of sensor shell and a kind of 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 floor joint, 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 adopting two kinds of shell and matching layer at present, its structure is complex, the process is complicated, the influence variables of function are many, and the quality control is difficult, etc.

[0006] In the first aspect, the application provides a kind of sensor shell, including inner shell, the inner shell outside is equipped with coaxial outer shell, the top between the inner shell and the outer shell has annular plate, the inner shell is equipped with panel near one end of the annular plate, and the panel is used to connect piezoelectric ceramic sheet.

[0007] The inner shell, the outer shell, the annular plate and the panel are integrally formed.

[0008] The sensor shell described in the application comprises an inner shell, an outer shell coaxial with the inner shell, and an annular plate between the top of the inner shell and the outer shell, the inner shell and the outer shell are connected through the annular plate, and the inner shell is provided with a panel at one end close to the annular plate, and the inner shell, the outer shell, the annular plate and the panel are integrally formed, so that the inner shell, the outer shell 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 manufactured, the inner shell, the outer shell 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 is easily affected by assembly tolerance during the assembly process, resulting in poor consistency of the product. The sensor shell of the application has an integrated inner shell, outer shell and 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 signal transmission of the piezoelectric ceramic sheet, so as to realize coupling of the shell with the piezoelectric ceramic sheet, and thus there is no need for an additional matching layer, greatly simplifying the process flow. Further, due to the integrated inner shell and outer shell, there is no need for a small plastic shell to position the piezoelectric ceramic sheet, and assembly tolerance during assembly of the two outer shells is avoided. The sensor shell of the 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.

[0009] Preferably, the density of the panel is 0.35g / cm3-0.9g / cm3, and the thickness of the panel is 1.6mm-3.0mm.

[0010] Preferably, a first accommodating cavity is formed between the inner shell and the panel, and the first accommodating cavity is used to place the piezoelectric ceramic sheet.

[0011] Preferably, a second accommodating cavity is formed between the inner shell, the outer shell and the annular plate, and the second accommodating cavity is used to accommodate the shock absorbing layer, which has the effect of buffering the residual vibration of the piezoelectric ceramic sheet.

[0012] Preferably, one end of the inner shell away from the panel is located inside the outer shell.

[0013] Preferably, the one end of the inner shell away from the panel is further provided with a first groove.

[0014] Preferably, the annular plate is flush with the panel.

[0015] Preferably, the inner shell and the outer shell are both cylindrical.

[0016] Preferably, the inner shell comprises at least two first boss structures, all of the first boss structures are arranged circumferentially spaced apart along the outer shell, and one end of the first boss structure is connected with the panel or the annular plate. Since all of the first boss structures are arranged circumferentially spaced apart along the outer shell, the ultrasonic sensor after being manufactured has large vibration along the Z axis, the product end surface has stronger vibration, can generate more energy transmission, and has smaller residual vibration.

[0017] Preferably, the outer diameter of the inner shell is Φ8.2mm-Φ11mm.

[0018] Preferably, the inner side surface of the annular plate is flush with the inner side surface of the panel.

[0019] Preferably, a second annular groove is arranged on the inner side surface of the annular plate. The area of the panel in contact with the piezoelectric ceramic sheet is adjusted through the second annular groove, so as to adjust the size of the residual vibration of the ultrasonic sensor. Further, the second annular groove can be used to fill elastic glue to inhibit the vibration of the piezoelectric ceramic sheet towards the outer shell, or can be used to fill the backing glue to form part of the backing layer, so as to better reduce vibration.

[0020] Preferably, the outer shell, the annular plate and the panel surround 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 penetrating through, so as to facilitate the assembly of the backing.

[0021] Preferably, the outer side surface of the panel protrudes from the end surface of the corresponding side of the outer shell. After the sound wave passes through the convex interface, it spreads outward along the central axis, so that the sound wave emission angle is wider, the near-field area sound field is uniform, it is suitable for large-range target detection, and the detection angle is also increased.

[0022] The outer side surface of the panel has a curved surface part, and the curved surface part is arranged outwardly convex towards the outer side of the panel. It can increase the ultrasonic emission and acceptance angle, and the sound wave behavior is strong emission, which can meet the needs in some scenes, for example, when a relatively large detection angle is required, so as to achieve the effect of wide coverage in the near field.

[0023] The outer side surface of the panel has a curved surface part, and the curved surface part is arranged inwardly concave towards the inner side of the panel. It can force the sound wave energy to propagate and converge along the normal direction of the concave surface, so that the directivity is narrowed and the beam angle is smaller, which can meet the needs in some scenes, for example, it can greatly improve the local energy intensity, and the higher the frequency, the shorter the wavelength, and the stronger the focusing ability.

[0024] In a second aspect, the application provides an ultrasonic sensor, comprising a piezoelectric ceramic sheet, a damping layer, a backing layer, a terminal wire, a potting layer and a shell structure as described in the application, 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.

[0025] 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;

[0026] 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.

[0027] The ultrasonic sensor described in the application, in production, the piezoelectric ceramic sheet and the backing layer are sequentially arranged in the inner shell, 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 shell is used to couple with the piezoelectric ceramic sheet, and then no additional matching layer is needed, greatly simplifying the process flow, and at the same time, due to the integrated arrangement of the inner shell and the outer shell, no small plastic shell is needed for positioning the piezoelectric ceramic sheet, and the assembly tolerance that easily occurs when assembling the two shells is also avoided, greatly improving the production efficiency of the ultrasonic sensor.

[0028] Compared with the prior art, the ultrasonic sensor has the following beneficial effects:

[0029] 1. The sensor shell described in the application comprises an inner shell, an outer shell coaxial with the inner shell is arranged on the outer side of the inner shell, and an annular plate is arranged between the top of the inner shell and the outer shell, the inner shell and the outer shell are connected through the annular plate, and the inner shell is provided with a panel at one end close to the annular plate, and the inner shell, the outer shell, the annular plate and the panel are integrally formed, so that the inner shell, the outer shell and the panel 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 assembly tolerance during the assembly process, resulting in poor consistency of the product. The sensor shell of the application has an integrated arrangement of the inner shell, the outer shell and the panel, the piezoelectric ceramic sheet is connected to the panel during the production of the sensor, and the panel is used as a matching layer for signal transmission of the piezoelectric ceramic sheet, so that the shell is used to couple with the piezoelectric ceramic sheet, and then no additional matching layer is needed, greatly simplifying the process flow. Further, due to the integrated arrangement of the inner shell and the outer shell, no small plastic shell is needed for positioning the piezoelectric ceramic sheet, and the assembly tolerance that easily occurs when assembling the two kinds of shells is also avoided. The sensor shell of the 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.

[0030] 2. The ultrasonic sensor described in the application, in production, the piezoelectric ceramic sheet and the backing layer are arranged in the inner shell in turn, and the piezoelectric ceramic sheet is connected to the panel, and the panel is used as the matching layer for the piezoelectric ceramic sheet to transmit signals, so as to realize the coupling of the piezoelectric ceramic sheet with the shell, and then no additional matching layer is needed, which greatly simplifies the process flow, and at the same time, due to the integrated arrangement of the inner shell and the outer shell, the positioning of the piezoelectric ceramic sheet by the embedded small plastic shell is no longer needed, and the assembly tolerance easily occurred when assembling the two shells is also avoided, which greatly improves the production efficiency of the ultrasonic sensor. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a three-dimensional schematic diagram of the shell structure of the application Figure 1 .

[0032] Figure 2 is a three-dimensional schematic diagram of the shell structure of the application Figure 2 .

[0033] Figure 3 is a sectional view of the shell structure of the application.

[0034] Figure 4 is a size marking diagram of the inner shell, the annular plate and the panel.

[0035] Figure 5 is a schematic diagram of the ultrasonic sensor of the application.

[0036] Figure 6 is a sectional view of the ultrasonic sensor.

[0037] Figure 7 is a sectional view of the shell structure of the application (the inner shell is cylindrical, without the first groove).

[0038] Figure 8 is a sectional view of the shell structure of the application (the first boss structure).

[0039] Figure 9 is a sectional view of the shell structure of the application (the second annular groove).

[0040] Figure 10 is a sectional view of the shell structure of the application (the outer convex arc surface part).

[0041] Figure 11 is a sectional view of the shell structure of the application (the inner concave arc surface part).

[0042] Figure 12 is a sectional view of the shell structure of the application (the panel protrudes from the end surface of the shell).

[0043] Markings in the figure:

[0044] 1 - inner housing, 11 - first groove, 2 - outer housing, 3 - ring plate, 4 - panel, 5 - piezoelectric ceramic sheet, 6 - damping layer, 7 - backing layer, 8 - terminal wire, 9 - potting layer, 10 - first accommodating cavity, 20 - second accommodating cavity, 21 - inner cavity, 30 - lead wire, 40 - first boss structure, 43 - cambered surface part, 60 - second ring groove. DETAILED DESCRIPTION

[0045] 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 only, and any technology realized based on the content of the utility model falls within the scope of the utility model.

[0046] In the description of the embodiments of the utility model, the terms indicating the orientation or positional relationship of "up", "down", "left", "right", "center", "inner", "outer", etc. are expressed based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product / equipment / device of the utility model is usually placed. These terms of orientation or positional relationship are only used to facilitate the description of the scheme of the utility model or simplify the description in the embodiments, so as to enable the skilled person to quickly understand the scheme, and therefore cannot be understood as indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, and thus cannot be understood as limiting the utility model.

[0047] In addition, the terms "horizontal", "vertical", "overhanging", "parallel", etc. do not mean that the corresponding device / component / element must be absolutely horizontal or vertical or overhanging or parallel, but can be slightly inclined or deviated. 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 mean that the corresponding device / component / element is arranged in the direction of "horizontal", "vertical", "overhanging", "parallel", etc., 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 scheme of the utility model.

[0048] In addition, the terms "first", "second", "third", etc. appearing in the terms are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of a specific component.

[0049] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0050] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0051] Example 1

[0052] like Figures 1-3 As shown, the sensor housing described in this embodiment includes an inner shell 1, an outer shell 2 coaxially arranged on the outside of the inner shell 1, an annular plate 3 between the top of the inner shell 1 and the outer shell 2, and a panel 4 arranged at one end of the inner shell 1 near the annular plate 3. The panel 4 is used to connect a piezoelectric ceramic sheet 5.

[0053] The inner shell 1, outer shell 2, annular plate 3, and panel 4 are integrally formed.

[0054] The inner shell 1 and the outer shell 2 are connected by an annular plate 3, and a panel 4 is provided at one end of the inner shell 1 near the annular plate 3. The inner shell 1, outer shell 2, annular plate 3, and panel 4 are integrally formed, thus making the inner shell 1, outer shell 2, and panel 4 a whole. Since the two shells and matching layer of traditional ultrasonic sensors are made separately, secondary assembly of the two shells and matching layer is required during the sensor production process. This is not only complex in structure and cumbersome in process, but also easily affected by assembly tolerances during the assembly process, resulting in poor product consistency. However, the sensor shell of this application has an integral setting of the inner shell 1, outer shell 2, and panel 4. During sensor production, the piezoelectric ceramic sheet 5 is connected to the panel 4, and the panel 4 is used as a matching layer for the piezoelectric ceramic sheet 5 to transmit signals. This allows the housing to be coupled with the piezoelectric ceramic sheet 5, eliminating the need for an additional matching layer and greatly simplifying the process. Furthermore, since the inner shell 1 and the outer shell 2 are integrated, there is no need for an embedded small plastic shell to position the piezoelectric ceramic sheet 5, and it also avoids the assembly tolerances that are easy to occur when assembling the two types of housings. The sensor housing of this application has a simple process, effectively reduces variable factors, lowers the difficulty of production quality control, and effectively improves the production efficiency of traditional ultrasonic sensors.

[0055] In the present application, the inner shell 1, the outer shell 2, the annular plate 3 and the panel 4 are integrally formed by injection molding process or machining process. Taking the injection molding process as an example, a male and female 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 0.35g / cm3~0.9g / 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 female mold, and then the male and female mold is locked and baked to form the sensor shell of the present application.

[0056] The sensor shell of the present application eliminates the traditional outer shell and embedded plastic shell support shell, reduces the material cost, and solves the problem of difficult quality control caused by complex structure and multiple variables of the traditional shell.

[0057] In one or more embodiments, the density of the panel 4 is 0.35g / cm3~0.9g / cm3, as shown in Figure 4 , and the thickness of the panel 4 is a, the size of a is 1.6mm~3.0mm.

[0058] 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 1.6mm~3.0mm.

[0059] In an optional embodiment, as shown in Figure 4 , the outer diameter of the inner shell 1 is b, and the outer diameter of the inner shell 1 affects the product vibration and ultrasonic energy size, and the control range is Φ8.2mm~Φ11mm.

[0060] In an optional embodiment, as shown in Figure 4 , 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.

[0061] In one or more embodiments, as shown in Figure 3 , 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, as shown in Figure 6 .

[0062] 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 first accommodating cavity 10 accommodates the piezoelectric ceramic sheet 5, and the panel 4 is used as the matching layer of the piezoelectric ceramic sheet 5. It is not necessary to embed a small plastic shell to position the piezoelectric ceramic sheet 5, and it is not necessary to set a matching layer. In the case of ensuring the normal use of the piezoelectric ceramic sheet 5, the shell structure is simplified.

[0063] In an optional embodiment, as shown in Figure 3 A second accommodating cavity 20 is formed between the inner shell 1, the outer shell 2 and the annular plate 3.

[0064] By filling the second accommodating cavity 20 with the damping layer 6, the effect of buffering the residual vibration of the piezoelectric ceramic sheet 5 is achieved. Figure 6 .

[0065] In an optional embodiment, as shown in Figure 3 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, and it is convenient to fill the potting layer 9 at the end of the outer shell 2 to seal the inner shell 1 during subsequent assembly of the ultrasonic sensor. Figure 6 .

[0066] In an optional embodiment, as shown in Figure 1 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 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 achieve 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. Figure 6 .

[0067] In an optional embodiment, the annular plate 3 is flush with the panel 4.

[0068] In an optional embodiment, the inner shell 1 is cylindrical.

[0069] In an optional embodiment, the inner shell 1 and the outer shell 2 are cylindrical structures, 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.

[0070] In an optional embodiment, the inner shell 1 includes at least two first boss structures 40, all the first boss structures 40 are arranged circumferentially along the outer shell 2, and one end of the first boss structure 40 is connected with the panel 4 or the annular plate 3. Since all the first boss structures 40 are arranged circumferentially along the outer shell 2, the ultrasonic sensor after being manufactured has large vibration along the Z axis, the vibration of the product end surface is stronger, energy transmission is better, and the residual vibration is smaller.

[0071] In an optional embodiment, the inner side of the annular plate 3 is flush with the inner side of the panel 4.

[0072] In an optional embodiment, the shell 2, the annular plate 3 and the panel 4 enclose an inner cavity 21 with a closed end. That is, the shell 2, the annular plate 3, the panel 4, the connection between the annular plate 3 and the shell 2, and the connection between the annular plate 3 and the panel 4 are all free of through holes to facilitate the assembly of the backing.

[0073] As shown in Figures 10-12 In an optional embodiment, the outer side of the panel 4 protrudes from the end surface of the corresponding side of the shell 2. After the sound wave passes through the protruding interface, it spreads outward along the central axis, making the sound wave emission angle wider, the sound field in the near field area more uniform, suitable for large-range target detection, and the detection angle also increased.

[0074] As shown in Figure 10 In an optional embodiment, the outer side of the panel 4 has an arc surface part 43, which is arranged to protrude outwardly from the outer side of the panel 4. This increases the ultrasonic wave emission and acceptance angle, and the sound wave behaves as a strong emitter, which is suitable for certain scenarios, such as when a larger detection angle is required, to achieve the effect of wide coverage in the near field.

[0075] As shown in Figure 11 In an optional embodiment, the outer side of the panel 4 has an arc surface part 43, which is arranged to protrude inwardly from the inner side of the panel 4. This forces the sound wave energy to propagate and converge along the normal direction of the concave surface, making the directivity narrower and the beam angle smaller, which is suitable for certain scenarios, such as being able to greatly improve the local energy intensity, and the higher the frequency, the shorter the wavelength, the stronger the focusing ability.

[0076] As shown in Figure 9 In an optional embodiment, a second annular groove 60 is arranged on the inner side of the annular plate 3. The second annular groove 60 is used to adjust the area of the panel in contact with the piezoelectric ceramic sheet, thereby adjusting the size of the residual vibration of the ultrasonic sensor. Further, the second annular groove 60 can be filled with elastic glue to suppress the vibration of the piezoelectric ceramic sheet towards the shell direction, or filled with backing glue to form part of the backing layer, thereby better reducing vibration.

[0077] Embodiment 2

[0078] 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 the 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.

[0079] The inner shell 1 and the outer shell 2 are further filled with the damping layer 6, and the end of the outer shell 2 away from the panel 4 is filled with the potting layer 9.

[0080] The terminal wire 8 passes through the potting layer 9 and the backing layer 7 and is connected with the lead-out wire 30 of the piezoelectric ceramic sheet 5.

[0081] 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, which serves as a matching layer for the piezoelectric ceramic sheet 5 to transmit signals, so as to realize coupling with the piezoelectric ceramic sheet 5 by the shell, and thus no additional matching layer is needed, greatly simplifying 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 that easily occurs when assembling the two shells is also avoided, greatly improving the production efficiency of the ultrasonic sensor.

[0082] In an optional embodiment, 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.

[0083] The embodiment also discloses a production method of the ultrasonic sensor, and the specific steps are as follows:

[0084] (1) preparing shell material;

[0085] (2) pouring the shell material into the concave mold by using a precise dispensing machine, and the glue amount is controlled by dispensing air pressure and dispensing time;

[0086] (3) welding the lead-out wire 30 of the piezoelectric ceramic sheet 5, and the welding uses a professional laser welding device, and the lead-out wire 30 is made of silver-plated copper wire;

[0087] (4) preassembling the piezoelectric ceramic sheet 5 with the welded lead-out wire 30 on the convex mold platform and negative pressure adsorbing;

[0088] (5) then locking the convex mold and the concave mold, baking for a certain time for curing, and then demolding,

[0089] (6) demolding, separating the convex mold and the concave mold by using a mechanical claw hand, and taking out the sensor shell;

[0090] (7) welding the external terminal wire 8 with the lead-out wire 30 of the piezoelectric ceramic sheet 5;

[0091] (8) pouring the backing glue into the inner shell 1 by using a precise dispensing machine to form the backing layer 7, and the glue amount is controlled by dispensing air pressure and dispensing time;

[0092] (9) pouring the potting glue into the outer shell 2 by using a 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.

[0093] The ultrasonic sensor described in the embodiment is preferably used for material identification and distance measurement.

[0094] Example 3

[0095] like Figures 1-3 As shown in the figure, an ultrasonic sensor housing according to this embodiment includes an inner shell 1, an outer shell 2 sleeved on the outside of the inner shell 1, the inner shell 1 and the outer shell 2 are spaced apart, an annular plate 3 is provided on the inner side of the end of the inner shell 1 and the outer shell 2, the annular plate 3 is connected between the inner shell 1 and the outer shell 2, and a panel 4 is connected to one end of the inner shell 1 near the annular plate 3, the panel 4 is used to connect a piezoelectric ceramic sheet 5.

[0096] This embodiment describes an ultrasonic sensor housing, in which an inner shell 1 and an outer shell 2 are spaced apart for filling and molding a vibration damping layer 6. An annular plate 3 is provided on the inner side of each end of the inner shell 1 and the outer shell 2, connecting the inner shell 1 and the outer shell 2 to prevent the vibration damping layer 6 from leaking out from the end near the annular plate 3 during filling. A panel 4 is connected to the end of the inner shell 1 near the annular plate 3, and the panel 4 is used to connect a piezoelectric ceramic sheet 5. This structure allows for the simultaneous filling of the backing layer 7 (filled inside the inner shell 1) and the vibration damping layer 6 on the same side during construction, which is simpler than existing methods of filling on opposite sides.

[0097] Preferably, the outer shell 2, the annular plate 3, and the panel 4 are integrally formed.

[0098] The inner shell 1 and the outer shell 2 are connected by an annular plate 3, and a panel 4 is provided at one end of the inner shell 1 near the annular plate 3. The outer shell 2, the annular plate 3, and the panel 4 are integrally formed, thus making the annular plate 3, the outer shell 2, and the panel 4 a whole. Since the two shells and matching layers of traditional ultrasonic sensors are manufactured separately, secondary assembly of the two shells and matching layers is required during sensor production. This is not only structurally complex and cumbersome, but also susceptible to the influence of assembly tolerances during the assembly process, resulting in poor product consistency. In contrast, the sensor shell, outer shell 2, and panel 4 of this application are integrated, improving the sensor's performance. During device production, the piezoelectric ceramic sheet 5 is connected to the panel 4, and the panel 4 is used as a matching layer for the piezoelectric ceramic sheet 5 to transmit signals. This allows the housing to be coupled with the piezoelectric ceramic sheet 5, eliminating the need for an additional matching layer and greatly simplifying the process. Furthermore, since the inner shell 1 and the outer shell 2 are integrated, there is no need for an embedded small plastic shell to position the piezoelectric ceramic sheet 5, and it also avoids the assembly tolerances that are easy to occur when assembling the two types of housings. The sensor housing of this application has a simple process, effectively reduces variable factors, lowers the difficulty of production quality control, and effectively improves the production efficiency of traditional ultrasonic sensors.

[0099] In the present application, the one-piece forming process of the shell 2, the annular plate 3 and the panel 4 adopts an injection molding process, and a male-female mold is prepared in advance to design the shape of the shell. The main component of the shell 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. When performing one-piece forming, the shell 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 form the sensor shell of the present application.

[0100] The sensor shell of the present application eliminates the traditional outer shell and embedded plastic shell support shell, reduces material costs, and solves the problem of difficult quality control caused by the complex structure and multiple variables of the traditional shell.

[0101] 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 , and the thickness of the panel 4 is a, and the size of a is 1.6 mm~3.0 mm.

[0102] The thickness of the panel 4 directly affects the coupling frequency and impedance parameters of the piezoelectric ceramic sheet 5 after bonding, and the control range is 1.6 mm~3.0 mm.

[0103] In an optional embodiment, as shown in Figure 4 , the outer diameter of the inner shell 1 is b, and the outer diameter of the inner shell 1 affects the product vibration and ultrasonic energy size, and the control range is Φ8.2 mm~Φ11 mm.

[0104] In an optional embodiment, as shown in Figure 4 , 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 1 mm~1.5 mm.

[0105] In one or more embodiments, as shown in Figure 3 , 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, as shown in Figure 6 .

[0106] 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 first accommodating cavity 10 accommodates the piezoelectric ceramic sheet 5, and the panel 4 is used as a matching layer for the piezoelectric ceramic sheet 5. No small plastic shell is needed for positioning the piezoelectric ceramic sheet 5, and no matching layer is needed. In the case of ensuring the normal use of the piezoelectric ceramic sheet 5, the shell structure is simplified.

[0107] In an optional embodiment, as shown in Figure 3 A second accommodating cavity 20 is formed between the inner shell 1, the outer shell 2 and the annular plate 3. By filling the second accommodating cavity 20 with a damping layer 6, the effect of buffering the residual vibration of the piezoelectric ceramic sheet 5 is achieved, as shown in Figure 6 .

[0108] In an optional embodiment, as shown in Figure 3 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, and it is convenient to fill the potting layer 9 at the end of the outer shell 2 to seal the inner shell 1 during subsequent assembly of the ultrasonic sensor, as shown in Figure 6 .

[0109] In an optional embodiment, as shown in Figure 1 The end of the inner shell 1 away from the panel 4 is also provided with a first recess 11. By providing the end of the inner shell 1 away from the panel 4 with a first recess 11, it is convenient to clamp the terminal wire 8 in the first recess 11 during subsequent installation of the terminal wire 8 to fix the terminal wire 8, so that the pin back cover is not needed as the intermediate connection part of the piezoelectric ceramic sheet 5 and the terminal wire 8, and the direct connection of the terminal wire 8 and the lead-out wire 30 is achieved, which simplifies the structure of the ultrasonic sensor without affecting the function of the ultrasonic sensor, as shown in Figure 6 .

[0110] In an optional embodiment, the first recess 11 is at least two, and all the first recesses 11 are arranged circumferentially along the inner shell 1.

[0111] In an optional embodiment, the annular plate 3 is flush with the panel 4.

[0112] In an optional embodiment, the inner shell 1 and the outer shell 2 are in a 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.

[0113] In an optional embodiment, the inner shell 1 includes at least two first boss structures 40, all the first boss structures 40 are arranged circumferentially along the outer shell 2, and one end of the first boss structure 40 is connected to the panel 4 or the annular plate 3.

[0114] Example 4

[0115] As shown in Figures 5-6 The embodiment includes a piezoelectric ceramic sheet 5, a damping layer 6, a backing layer 7, a terminal wire 8, a potting layer 9 and an ultrasonic sensor shell as described in Example 1, the piezoelectric ceramic sheet 5 is connected to the inner side of the inner shell 1, at least a part of the backing layer 7 is arranged on the inner side of the inner shell 1, and the piezoelectric ceramic sheet 5 is connected to the panel 4.

[0116] The outer shell 2 is filled with the potting layer 9 away from one end of the panel 4; the inner shell 1 and the outer shell 2 are filled with the damping layer 6; the damping layer 6 is located between the potting layer 9 and the annular plate 3.

[0117] The ultrasonic sensor shell described in the embodiment, the inner shell 1 and the outer shell 2 are spaced apart for filling the formed damping layer 6, the inner side of the end of the inner shell 1 and the outer shell 2 is provided with the annular plate 3, the annular plate 3 is connected between the inner shell 1 and the outer shell 2, preventing the damping layer 6 from leaking out from the end close to the annular plate 3 when filling. The end of the inner shell 1 close to the annular plate 3 is connected with the panel 4, and the panel 4 is used to connect the piezoelectric ceramic sheet 5. The above structure makes it possible to fill the backing layer 7

filled in the inner side of the inner shell 1

[0118] The terminal line 8 passes through the potting layer 9 and the backing layer 7 and is connected with the lead-out line 30 of the piezoelectric ceramic sheet 5.

[0119] During 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, which serves as a matching layer for the piezoelectric ceramic sheet 5 to transmit signals, so as to realize coupling with the piezoelectric ceramic sheet 5 by using the shell, thereby no longer needing to make an additional matching layer, greatly simplifying the process flow. At the same time, due to the integral arrangement of the inner shell 1 and the outer shell 2, it is no longer necessary 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, greatly improving the production efficiency of the ultrasonic sensor.

[0120] In an optional embodiment, as shown in Figure 6 The backing layer 7 and the damping layer 6 are integrally poured to realize process reduction and efficiency increase.

[0121] The embodiment also discloses a production method of the ultrasonic sensor, and specific steps are as follows: (1) preparing a 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 time, 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 back adhesive into the inner shell 1 by using the precise dispensing machine, forming a back adhesive layer 7, and the glue amount is controlled by dispensing air pressure and dispensing time; (9) filling the potting adhesive into the outer shell 2 by using the precise dispensing machine, forming a potting layer 9, and the glue amount is controlled by dispensing air pressure and dispensing time, and the ultrasonic sensor is completed.

[0122] The ultrasonic sensor is preferably used for material identification and distance measurement.

[0123] The above only describes preferred embodiments of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A sensor housing, characterized by, The sensor shell comprises an inner shell (1), an outer shell (2) coaxial with the inner shell (1), an annular plate (3) between the inner shell (1) and the outer shell (2), and a panel (4) on one end of the inner shell (1) close to the annular plate (3), wherein the panel (4) is used for connecting a piezoelectric ceramic sheet (5). The inner shell (1), the outer shell (2), the annular plate (3) and the panel (4) are integrally formed.

2. A sensor housing according to claim 1, wherein, The panel (4) has a density of 0.4 g / cm3-0.9 g / cm3 and a thickness of 1.6 mm-3.0 mm.

3. A sensor housing according to claim 1, wherein, The inner shell (1) and the panel (4) form a first accommodating cavity (10) for placing the piezoelectric ceramic sheet (5).

4. The sensor housing of claim 1, wherein, The inner shell (1), the outer shell (2) and the annular plate (3) form a second accommodating cavity (20).

5. The sensor housing of claim 1, wherein, The end of the inner shell (1) away from the panel (4) is located inside the outer shell (2).

6. A sensor housing according to claim 1, wherein, The end of the inner shell (1) away from the panel (4) is further provided with a groove (11).

7. A sensor housing according to claim 1, wherein, The annular plate (3) is flush with the panel (4).

8. A sensor housing according to any one of claims 1-7, characterized in that The inner shell (1) and the outer shell (2) are both cylindrical.

9. The sensor housing of claim 1, wherein, The inner shell (1) comprises at least two first boss structures (40), all the first boss structures (40) are arranged in a circumferential direction of the outer shell (2) and one end of the first boss structure (40) is connected with the panel (4) or the annular plate (3).

10. The sensor housing of claim 1, wherein, The outer diameter of the inner shell (1) is Φ8.2 mm-Φ11 mm.

11. A sensor housing according to claim 1, wherein, The inner side of the annular plate (3) is flush with the inner side of the panel (4).

12. The sensor housing of claim 1, wherein, The inner side of the annular plate (3) is provided with a second annular groove (60).

13. The sensor housing of claim 1, wherein, The outer shell (2), the annular plate (3) and the panel (4) form an inner cavity (21) with a closed end.

14. The sensor housing of claim 1, wherein, The outer side of the panel (4) protrudes from the end surface of the corresponding side of the outer shell (2).

15. The sensor housing of claim 1, wherein, The outer side of the panel (4) has an arc surface part (43) which is outwardly convex towards the outer side of the panel (4).

16. The sensor housing of claim 1, wherein, The outer side of the panel (4) has an arc surface part (43) which is inwardly concave towards the inner side of the panel (4).

17. An ultrasonic sensor, characterized by The sensor shell comprises a piezoelectric ceramic sheet (5), a damping layer (6), a backing layer (7), a terminal wire (8), a potting layer (9) and the sensor shell according to any one of claims 1-16, wherein 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). The inner shell (1) and the outer shell (2) are further filled with the damping layer (6), and the end of the outer shell 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 (30) of the piezoelectric ceramic sheet (5).

18. An ultrasonic sensor according to claim 17, wherein, The backing layer (7) and the damping layer (6) are integrally cast.

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