Ultrasonic sensor

Abstract

The utility model relates to the technical field of ultrasonic sensors, in particular to an ultrasonic sensor which comprises a matching layer, an outer shell is sleeved on the outer side of the matching layer, a groove with an opening at one end is arranged between the matching layer and the outer shell, and a prefabricated rubber ring is arranged in the groove. According to the ultrasonic sensor, the groove with the opening in one end is formed between the matching layer and the outer shell, and the prefabricated rubber ring is arranged in the groove, so that the rubber ring can be installed into the groove after a single part is formed to replace an existing damping layer formed through glue injection; therefore, the waiting time after the groove space is filled is effectively reduced, the control of the production process is facilitated, the assembly efficiency is higher, the problem of unbalanced gravity center caused by glue solidification can be effectively reduced or overcome, and the consistency of the produced ultrasonic sensor is better.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic sensors, and particularly relates to an ultrasonic sensor. Background Art

[0002] Currently, in the design of ultrasonic sensors, an annular groove is often provided between the matching layer and the outer housing. During the later assembly process, a glue injection method is used to fill at least part of the space in the groove to achieve some effects. For example, the effects are to make the ultrasonic sensor have better shock absorption effect or better sealing effect between the components of the ultrasonic sensor.

[0003] The patent "An Ultrasonic Sensor" (CN115825963A) discloses an ultrasonic sensor, which includes a plastic shell, a piezoelectric ceramic sheet and a matching layer. The piezoelectric ceramic sheet is connected to the matching layer, and the plastic shell is connected to the matching layer. The piezoelectric ceramic sheet, the plastic shell and the matching layer are connected into a whole during the curing process of the matching layer. During assembly, a damping layer is formed by filling the groove between the matching layer and the outer housing with liquid.

[0004] However, during the later production process, it is found that on the one hand, when forming the damping layer by glue perfusion, the glue needs a certain time to solidify, and the solidification of the glue is greatly affected by temperature and humidity, which is not conducive to the control of the production process. On the other hand, when injecting glue, it is easy to cause the center of gravity of the ultrasonic sensor to shift after perfusion, with one side being heavy and the other side being light. The unbalanced center of gravity will cause deviation in the ultrasonic emission angle of the sensor, affecting the detection accuracy. Summary of the Utility Model

[0005] The purpose of this embodiment is to propose an ultrasonic sensor for the problem that the liquid needs a long time to solidify and form after filling the groove in the background art.

[0006] To achieve the above purpose, the technical solution adopted in this embodiment is as follows:

[0007] An ultrasonic sensor includes a matching layer, an outer housing is sleeved outside the matching layer, a groove with one end open is provided between the matching layer and the outer housing, and a prefabricated rubber ring is arranged in the groove.

[0008] In the ultrasonic sensor of the present application, a groove with one end open is provided between the matching layer and the outer housing, and a prefabricated rubber ring is arranged in the groove, so that the rubber ring can be installed into the groove after forming the part to replace the existing damping layer formed by injecting glue. Thus, the waiting time after filling the groove space is effectively reduced, which is beneficial to the control of the production process, the assembly efficiency is higher, and the problem of unbalanced center of gravity caused by the solidification of glue can be effectively reduced or overcome, and the consistency of the produced ultrasonic sensors is better.

[0009] Preferably, the rubber ring is adhesively bonded to the outer housing.

[0010] Preferably, the groove is formed between the matching layer and the outer housing.

[0011] Preferably, the rubber ring is adhesively bonded to the matching layer.

[0012] Preferably, an inner housing and an outer housing are sequentially sleeved outside the matching layer, and the groove is formed between the inner housing and the outer housing.

[0013] Preferably, the rubber ring is adhesively bonded to the inner housing.

[0014] Preferably, a piezoelectric ceramic sheet is further included. The piezoelectric ceramic sheet is connected to the matching layer, the piezoelectric ceramic sheet is located inside the inner housing, and the inner housing is in limit fit with the piezoelectric ceramic sheet.

[0015] Preferably, the rubber ring is used for shock absorption.

[0016] Preferably, the rubber ring includes a first rubber ring and a second rubber ring that are connected to each other along the axial direction of the rubber ring, and the outer diameter of the first rubber ring is larger than the outer diameter of the second rubber ring.

[0017] Preferably, an ultrasonic sensor according to the present application further includes a piezoelectric ceramic sheet. The piezoelectric ceramic sheet is connected to the matching layer, and the piezoelectric ceramic sheet is located inside the outer housing. Description of the Drawings

[0018] Figure 1 It is a longitudinal sectional view of an ultrasonic sensor according to the present utility model (without a rubber ring and an inner housing).

[0019] Figure 2 It is a longitudinal sectional view of an ultrasonic sensor according to the present utility model (with a rubber ring, without an inner housing).

[0020] Figure 3 It is a longitudinal sectional view of an ultrasonic sensor according to the present utility model (with a first rubber ring and a second rubber ring).

[0021] Figure 4 It is a longitudinal sectional view of an ultrasonic sensor according to the present utility model (without a rubber ring, with an inner housing).

[0022] Figure 5 It is a longitudinal sectional view of an ultrasonic sensor according to the present utility model (with a rubber ring, with an inner housing).

[0023] Figure 6 It is a longitudinal sectional view of the rubber ring according to the present utility model.

[0024] Reference numerals: 1 - matching layer, 2 - rubber ring, 3 - outer housing, 4 - piezoelectric ceramic sheet, 5 - first rubber ring, 6 - second rubber ring, 7 - groove, 8 - inner housing, 9 - arc portion. Detailed implementation manners

[0025] The following further describes the present utility model in detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. Any technology implemented based on the content of the present utility model belongs to the scope of the present utility model.

[0026] In the description of the specific embodiments of the present utility model, without special explanation, the expression terms of orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / device / device of the present utility model is habitually used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0027] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel", etc. appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging 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. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present utility model.

[0028] In addition, the expressions such as "first", "second", "third", etc. 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 specific components.

[0029] In addition, in the description of the embodiments of the present utility model, "several", "multiple", "a plurality of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be more than 9.

[0030] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / restricted, when the terms "set", "installed", "connected", "linked", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, and threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0031] Embodiment 1

[0032] As Figure 1-6 shown, an ultrasonic sensor described in this embodiment includes a matching layer 1. An outer casing 3 is sleeved outside the matching layer 1. A groove 7 with one end open is provided between the matching layer 1 and the outer casing 3. A prefabricated rubber ring 2 is provided in the groove 7.

[0033] For example: The rubber ring 2 is used for shock absorption or sealing, or both shock absorption and sealing.

[0034] The rubber ring 2 is preferably made of silica gel or rubber material, and more preferably silica gel material, which has a good anti-natural aging effect.

[0035] Taking the shock absorption effect as an example: For an ultrasonic sensor described in this embodiment, a groove 7 with one end open is provided between the matching layer 1 and the outer casing 3. A prefabricated rubber ring 2 is provided in the groove 7, that is, after the rubber ring 2 is preformed, it is installed and embedded in the groove 7 to form a shock absorption layer. So that the rubber ring 2 can be a formed part and then installed into the groove 7 to replace the existing shock absorption layer formed by injecting glue. It can overcome the problem that the solidification of glue is greatly affected by temperature and humidity, which is not conducive to the production process control. The assembly efficiency is high, the waiting time after filling the space of the groove 7 is effectively reduced, the production time of the ultrasonic sensor is reduced, the production efficiency is improved, and the problem of unbalanced center of gravity caused by the solidification of glue can be effectively reduced or overcome, and the consistency of the produced ultrasonic sensors is better.

[0036] As Figure 1-3 shown, the following is an example of a preferred method: The groove 7 is formed between the matching layer 1 and the outer casing 3. In this way, a further preferred solution is: The rubber ring 2 is bonded to the outer casing 3; or the rubber ring 2 is bonded to the matching layer 1; or the rubber ring 2 is bonded to both the outer casing 3 and the matching layer 1.

[0037] For example: in one way of the ultrasonic sensor described in this embodiment, the piezoelectric ceramic sheet 4 is connected to the matching layer 1, the outer housing 3 is connected to the matching layer 1, and the piezoelectric ceramic sheet 4, the outer housing 3 and the matching layer 1 are integrally connected and formed during the curing process of the matching layer 1. Figure 2 The cross-sectional view of Figure 2 can intuitively show the shape after forming. After the matching layer 1 is cured, it adheres to the inner side wall of the outer housing 3, enabling the matching layer 1 to be well connected to the outer housing 3.

[0038] Such as Figure 4 and 5 As shown in Figure 4 and 5 , another preferred way is exemplified below: an inner housing 8 and an outer housing 3 are sequentially sleeved outside the matching layer 1, and a groove 7 is formed between the inner housing 8 and the outer housing 3. In this way, a further preferred solution is: the rubber ring 2 is bonded to the outer housing 3; or the rubber ring 2 is bonded to the inner housing 8; or the rubber ring 2 is bonded to both the outer housing 3 and the inner housing 8.

[0039] For example: in one way of the ultrasonic sensor described in this embodiment, the piezoelectric ceramic sheet 4 is connected to the matching layer 1, the inner housing 8 is connected to the matching layer 1, and the piezoelectric ceramic sheet 4, the inner housing 8 and the matching layer 1 are integrally connected and formed during the curing process of the matching layer 1. Figure 5 The cross-sectional view of Figure 5 can intuitively show the shape after forming. After the matching layer 1 is cured, it adheres to the inner side wall of the inner housing 8, enabling the matching layer 1 to be well connected to the inner housing 8. Specifically, it means placing the inner housing 8 and the piezoelectric ceramic sheet 4 at positions where they can be connected to the matching layer 1, and reserving a space that can be filled with liquid matching layer material. Injecting the liquid material into the reserved space, then during the process of the liquid material curing into the matching layer 1, the piezoelectric ceramic sheet 4 is connected to the matching layer 1, the inner housing 8 is connected to the matching layer 1, and the inner housing 8, the piezoelectric ceramic sheet 4 and the matching layer 1 form a whole, and are integrally connected and formed during the process of the matching layer changing from liquid to solid.

[0040] Such as Figure 1 As shown in Figure 1 , a preferred way is exemplified below: sometimes the groove 7 may be in the form of a stepped ring. At this time, the rubber ring 2 correspondingly includes a first rubber ring 5 and a second rubber ring 6 that are connected to each other along the axial direction of the rubber ring 2, and the outer diameter of the first rubber ring 5 is larger than the outer diameter of the second rubber ring 6.

[0041] In a preferred way, the first rubber ring 5 and the second rubber ring 6 are cemented or integrally formed.

[0042] Preferably, the ultrasonic sensor described in this embodiment further includes a piezoelectric ceramic sheet 4, the piezoelectric ceramic sheet 4 is connected to the matching layer 1, and the piezoelectric ceramic sheet 4 is located inside the outer housing 3.

[0043] When an ultrasonic sensor described in this embodiment has an inner housing 8, the piezoelectric ceramic sheet 4 is located inside the inner housing 8, and the inner housing 8 is in limit fit with the piezoelectric ceramic sheet 4. A specific preferred manner is as follows Figure 4 shown, the inner housing 8 is provided with a boss portion extending inward, and the boss portion and the piezoelectric ceramic sheet 4 are axially limited to each other along the outer housing 3.

[0044] As a preferred solution of this embodiment, a part of the piezoelectric ceramic sheet 4 is embedded in the matching layer 1. A part of the inner side wall of the outer housing 3 can also be embedded in the matching layer 1. As follows Figure 2 shown, the piezoelectric ceramic sheet 4 is embedded in the matching layer 1 during the curing process of the matching layer 1, and the piezoelectric ceramic sheet 4 is fixed on the matching layer 1. Such embedding is not a complete embedding, but a part of the piezoelectric ceramic sheet 4 is embedded in the matching layer 1, so that the vibration signal of the piezoelectric ceramic sheet 4 can be transmitted through the matching layer 1 on the lower surface and the side surface, meeting the directional requirements for the ultrasonic sensor to transmit from the end face. In addition, a part of the piezoelectric ceramic sheet 4 is embedded in the matching layer 1, and the matching layer 1 wraps the piezoelectric ceramic sheet 4, making the combination more stable.

[0045] As a preferred solution of this embodiment, one side of the piezoelectric ceramic sheet 4 embedded in the matching layer 1 has a lead end, and the lead end is used for electrical connection with the terminal wire.

[0046] As follows Figure 6 shown, in a preferred manner, a concave arc portion 9 is provided on one side surface of the rubber ring 2. The design of the arc portion 9 can prevent the transmitted sound pressure and received sensitivity from being affected by the forced clamping of the housing wall, enhancing the intensity of the transmitted signal and the echo signal. When using the ultrasonic sensor for high-frequency ranging, the accuracy of short-distance ranging is improved.

[0047] The above are only the preferred embodiments of this embodiment and are not intended to limit this embodiment. Any modifications, equivalent replacements, and improvements made within the spirit and principle of this embodiment shall be included in the protection scope of this embodiment.

Claims

1. An ultrasonic sensor, comprising a matching layer (1), an outer shell (3) is sleeved on the outer side of the matching layer (1), a groove (7) with one end open is arranged between the matching layer (1) and the outer shell (3), characterized in that: A prefabricated rubber ring (2) is arranged in the groove (7).

2. An ultrasonic sensor as claimed in claim 1, characterized in that: The rubber ring (2) is bonded to the outer shell (3).

3. An ultrasonic sensor as claimed in claim 1, characterized in that: The groove (7) is formed between the matching layer (1) and the outer shell (3).

4. An ultrasonic sensor as claimed in claim 1, characterized in that: The adhesive ring (2) is bonded to the matching layer (1).

5. An ultrasonic sensor as claimed in claim 1, characterized in that: An inner shell (8) and an outer shell (3) are sequentially sleeved on the outer side of the matching layer (1), and the groove (7) is formed between the inner shell (8) and the outer shell (3).

6. An ultrasonic sensor as claimed in claim 5, characterized in that: The rubber ring (2) is bonded to the inner shell (8).

7. An ultrasonic sensor as claimed in claim 5, characterized in that: It also comprises a piezoelectric ceramic sheet (4), the piezoelectric ceramic sheet (4) being connected to the matching layer (1), the piezoelectric ceramic sheet (4) being located inside the inner shell (8), and the inner shell (8) and the piezoelectric ceramic sheet (4) being limitedly matched.

8. An ultrasonic sensor as claimed in claim 1, characterized in that: The rubber ring (2) is used for shock absorption.

9. An ultrasonic sensor as claimed in claim 1, characterized in that: The rubber ring (2) comprises a first rubber ring (5) and a second rubber ring (6) which are connected to each other along the axial direction of the rubber ring (2); the outer diameter of the first rubber ring (5) is greater than the outer diameter of the second rubber ring (6).

10. An ultrasonic sensor as claimed in claim 1, characterized in that: It also comprises a piezoelectric ceramic sheet (4), wherein the piezoelectric ceramic sheet (4) is connected to the matching layer (1), and the piezoelectric ceramic sheet (4) is located inside the outer shell (3).

Images