Ultrasonic liquid level detection module

Abstract

The utility model relates to an ultrasonic liquid level detection module which comprises a shell, an inner cavity is formed in the shell in an inwards-concave mode, a piezoelectric ceramic piece and a circuit board are arranged in the inner cavity, the piezoelectric ceramic piece is electrically connected with the circuit board, the circuit board is led out of the inner cavity through a signal line, pouring sealant is arranged on the circuit board, and the circuit board is electrically connected with the piezoelectric ceramic piece. The circuit board is limited in the inner cavity by the pouring sealant; the shell is provided with a detection surface, the detection surface is sleeved with a rubber sleeve, and the rubber sleeve is a coupling layer; and the detection surface is far away from an opening concavely formed in the inner cavity. According to the ultrasonic liquid level detection module, the ultrasonic probe core shell and the module shell share the same shell structural part and are made into an integrated form; according to the ultrasonic liquid level detection module, the lead of the piezoelectric ceramic piece is directly connected to the circuit board, an adapter plate in the ultrasonic probe core is omitted, the overall size and the overall height of the ultrasonic liquid level detection module are greatly reduced, miniaturization is achieved, and the ultrasonic liquid level detection module is suitable for the vast majority of sweeper base stations.

Description

Technical Field

[0001] The present application relates to the technical field related to automatic liquid level detection, and in particular to an ultrasonic liquid level detection module. Background Art

[0002] In the related art, for example, Chinese patent 202223114143.4 discloses an ultrasonic liquid level detection module and system, which includes a circuit board and an ultrasonic probe. The detection part of the ultrasonic probe is provided with a coupling rubber sleeve, the outer end surface of the coupling rubber sleeve is tightly fitted with the outer wall bottom of the liquid container, and the ultrasonic probe is electrically connected to the circuit board. It also includes a main body shell; the coupling rubber sleeve, the ultrasonic probe and the circuit board are all located in the main body shell.

[0003] This type of ultrasonic liquid level detection module is provided with a main body shell and a shell of an ultrasonic probe arranged in the main body shell, and two shells are provided. At the same time, a circuit board is provided in the main body shell and an adapter board is provided in the ultrasonic probe. There are two circuit boards, which makes this type of ultrasonic liquid level detection module large in size and high in overall height, and is not suitable for most of the sweeping robot base stations. In addition, most of this type of ultrasonic liquid level detection modules do not provide anti-fool points, and the ultrasonic probe is easy to move, causing the power supply line and communication line to be torn; even if anti-fool points are provided, they must be used with fixing screws, which is extremely inconvenient to install, and after multiple disassembly, the screw mouth will be damaged, causing the screw to slip, and lose the function of fixing the product. Furthermore, the coupling rubber sleeve is arranged in the main body shell, which makes the coupling rubber sleeve non-replaceable or requires regular replacement. Once damaged, the entire module can only be replaced, and the repair and maintenance cost is high. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present application provides an ultrasonic liquid level detection module, which has a small size, is easy to replace the coupling rubber sleeve, has a long service life and high sensitivity.

[0005] The present application provides an ultrasonic liquid level detection module, comprising: a shell, the shell is provided with an inner cavity inwardly concave, a piezoelectric ceramic sheet and a circuit board are provided in the inner cavity, the piezoelectric ceramic sheet is electrically connected to the circuit board, the circuit board is led out of the inner cavity through a signal line, a potting glue is provided on the circuit board, and the potting glue confines the circuit board in the inner cavity; a detection surface is provided on the shell, a rubber sleeve is provided on the detection surface, and the rubber sleeve is a coupling layer; the detection surface is away from the opening concave in the inner cavity.

[0006] In the above-mentioned ultrasonic liquid level detection module, an annular step portion is provided in the inner cavity, and the step portion divides the inner cavity into a first accommodating cavity and a second accommodating cavity. The first accommodating cavity is close to the detection surface, the piezoelectric ceramic sheet is arranged in the first accommodating cavity, and the circuit board is arranged in the second accommodating cavity.

[0007] In the above-mentioned ultrasonic liquid level detection module, the piezoelectric ceramic sheet is bonded to the bottom of the first accommodating cavity, close to the detection surface.

[0008] In the above-mentioned ultrasonic liquid level detection module, a first fool-proofing portion and a second fool-proofing portion are provided on the step portion, and the first fool-proofing portion and the second fool-proofing portion are protruded from the inner wall of the second accommodating cavity.

[0009] In the above-mentioned ultrasonic liquid level detection module, a notch is provided on the circuit board, and the notch is clamped with the first fool-proof portion, so that the circuit board is fixed in the second accommodating cavity.

[0010] In the above-mentioned ultrasonic liquid level detection module, a guide portion is provided at the second fool-proof portion near the opening of the inner cavity, the circuit board enters the second accommodating cavity through the guide portion, and the side of the circuit board abuts against the second fool-proof portion.

[0011] In the above-mentioned ultrasonic liquid level detection module, a third fool-proofing portion is further provided on the step portion, and the top surface of the third fool-proofing portion is a plane, and the top surface abuts against the bottom surface of the circuit board to prevent the circuit board from sinking.

[0012] In the above-mentioned ultrasonic liquid level detection module, the rubber sleeve is provided with a plurality of through holes, and the through holes are used to discharge the air between the rubber sleeve and the detection surface when the rubber sleeve is in contact with the detection surface, so that the rubber sleeve is in close contact with the detection surface.

[0013] In the above-mentioned ultrasonic liquid level detection module, the shell is a circular boss-shaped structure, a first boss and a second boss connected to the first boss are provided on the outer side of the shell, the diameter of the first boss is smaller than the diameter of the second boss, and the detection surface is provided on the first boss.

[0014] In the above-mentioned ultrasonic liquid level detection module, the rubber sleeve is arranged on the outer side of the first boss.

[0015] The technical solution provided by the present application may include the following beneficial effects: the ultrasonic liquid level detection module, the ultrasonic probe shell and the module shell share the same shell structure, and are made into an integrated form; the lead of the piezoelectric ceramic sheet is directly connected to the circuit board, eliminating the adapter board in the ultrasonic probe, greatly reducing the overall volume and overall height of the ultrasonic liquid level detection module, achieving miniaturization and being suitable for most sweeper base stations. In addition, the rubber sleeve of the coupling layer is set on the outside of the shell, which is easy to disassemble and replace. If the rubber sleeve is accidentally damaged, only the rubber sleeve needs to be replaced without replacing the entire module, and the maintenance cost is low.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0018] Figure 1 is a schematic structural diagram of an ultrasonic liquid level detection module shown in an embodiment of the present application;

[0019] Figure 2 It is a schematic diagram of a partial structural decomposition of an ultrasonic liquid level detection module shown in an embodiment of the present application;

[0020] Figure 3 is a schematic structural diagram of a housing of an ultrasonic liquid level detection module shown in an embodiment of the present application;

[0021] Figure 4 It is another structural schematic diagram of the shell of the ultrasonic liquid level detection module shown in the embodiment of the present application.

[0022] Figure ID:

[0023] Housing 1; inner cavity 11; detection surface 12; first accommodating cavity 13; second accommodating cavity 14; step portion 15; first foolproof portion 151; second foolproof portion 152; guide portion 153; third foolproof portion 154; first boss 16; second boss 17;

[0024] Piezoelectric ceramic sheet 2;

[0025] Circuit board 3; notch 31;

[0026] Signal line 4;

[0027] Potting glue 5;

[0028] Rubber sleeve 6; through hole 61. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0030] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0031] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0033] See also Figure 1 and Figure 2 An ultrasonic liquid level detection module comprises: a shell 1, the shell 1 is provided with an inner cavity 11 inwardly concave, a piezoelectric ceramic piece 2 and a circuit board 3 are provided in the inner cavity 11, the piezoelectric ceramic piece 2 is electrically connected to the circuit board 3, the circuit board 3 is led out of the inner cavity 11 through a signal line 4, and a potting glue 5 is provided on the circuit board 3, and the potting glue 5 confines the circuit board 3 in the inner cavity 11. In this ultrasonic liquid level detection module, the ultrasonic probe shell 1 and the module shell 1 share the same shell 1 structure and are made into an integrated form; the lead of the piezoelectric ceramic piece 2 is directly connected to the circuit board 3, eliminating the adapter board in the ultrasonic probe, greatly reducing the overall volume and overall height of this ultrasonic liquid level detection module, achieving miniaturization and being suitable for most sweeping machine base stations.

[0034] See also Figure 1 and Figure 2, a detection surface 12 is provided on the shell 1, and a rubber sleeve 6 is provided on the detection surface 12, and the rubber sleeve 6 is a coupling layer; the detection surface 12 is away from the opening of the inner cavity 11, and the detection surface 12 is a flat surface. During use, the detection surface 12 is coupled with the bottom of the container to be tested. In addition, the rubber sleeve 6 of the coupling layer is sleeved on the outside of the shell 1, which is convenient for disassembly and replacement. If the rubber sleeve 6 is accidentally damaged, only the rubber sleeve 6 needs to be replaced, and the entire module does not need to be replaced, and the maintenance cost is low. In some preferred embodiments, a plurality of through holes 61 are provided on the rubber sleeve 6, and the through holes 61 are used to discharge the air between the rubber sleeve 6 and the detection surface 12 when the rubber sleeve 6 is in contact with the detection surface 12, so as to avoid the generation of bubbles, so that the rubber sleeve 6 is close to the detection surface 12, thereby improving the coupling effect. The rubber sleeve 6 is in the shape of a truncated cone, and is an independent part of the shell 1, and there are two through holes 61 on both sides for ventilation. The rubber sleeve 6 and the shell 1 adopt an interference design to ensure that it will not fall off during the process of taking and placing the container.

[0035] See also Figures 2 to 4 In some optional embodiments, an annular step portion 15 is provided in the inner cavity 11, and the step portion 15 divides the inner cavity 11 into a first accommodating cavity 13 and a second accommodating cavity 14. The first accommodating cavity 13 is close to the detection surface 12, the piezoelectric ceramic piece 2 is arranged in the first accommodating cavity 13, and the circuit board 3 is arranged in the second accommodating cavity 14. Further, the piezoelectric ceramic piece 2 is bonded to the bottom of the first accommodating cavity 13, close to the detection surface 12, which is convenient for detection and has high sensitivity.

[0036] Preferably, see Figures 2 to 4 The step portion 15 is provided with a first foolproof portion 151 and a second foolproof portion 152, which are protruded from the inner wall of the second accommodating cavity 14. There are two foolproof portions on the step portion 15, which are used to fix the product and prevent it from displacement. Specifically, a notch 31 is provided on the circuit board 3, and the notch 31 is clamped with the first foolproof portion 151, so that the circuit board 3 is fixed in the second accommodating cavity 14, so that the circuit board 3 will not be displaced.

[0037] See also Figures 2 to 4 Optionally, a guide portion 153 is provided at the opening of the second fool-proof portion 152 close to the inner cavity 11 , and the circuit board 3 enters the second accommodating cavity 14 through the guide portion 153 , and the side of the circuit board 3 abuts against the second fool-proof portion 152 .

[0038] See also Figures 2 to 4 In some preferred embodiments, a third anti-foolproofing portion 154 is further provided on the step portion 15. The top surface of the third anti-foolproofing portion 154 is a plane, and the top surface abuts against the bottom surface of the circuit board 3 to prevent the circuit board 3 from sinking.

[0039] For specific implementation, see Figures 1 to 4The housing 1 is a round boss-shaped structure, and a first boss 16 and a second boss 17 connected to the first boss 16 are provided on the outer side of the housing 1. The diameter of the first boss 16 is smaller than the diameter of the second boss 17, and the detection surface 12 is provided on the first boss 16. Preferably, the rubber sleeve 6 is sleeved on the outer side of the first boss 16, and the undercut structure is used, so that it can be easily fixed, and the housing 1 will not be damaged due to multiple disassembly.

[0040] This ultrasonic liquid level detection module adheres the piezoelectric ceramic sheet 2 to the bottom of the first accommodating cavity 13 of the inner cavity 11, fixes the circuit board 3 in the second accommodating cavity 14 through the first anti-foolproofing part 151 and the second anti-foolproofing part 152, and electrically connects the piezoelectric ceramic sheet 2 to the circuit board 3. The circuit board 3 is electrically connected to the signal line 4 and leads out of the inner cavity 11. After the product parts are assembled, they are sealed with glue, and the potting glue 5 confines the circuit board 3 in the inner cavity 11. Then the rubber sleeve 6 is set on the outside of the outer shell 1. The outer shell 1 is integrated, eliminating the need for numerous assembly procedures. The overall height of the outer shell 1 is small, and it is suitable for most sweeping machine base stations. The first anti-foolproofing part 151 and the second anti-foolproofing part 152 are provided, and there will be no problem of repeated disassembly leading to weakened fixing effect, thereby causing the product to detach from the substrate. The deformation of the rubber sleeve 6 itself can make the product in close contact with the container being measured, thereby improving the overall sensitivity of the product. The glue sealing makes the product waterproof. A small amount of water on the surface of the rubber sleeve 6 will improve the detection sensitivity of the product to a certain extent. Furthermore, the rubber sleeve 6 is provided with a through hole 61. When the product is squeezed, the air will be discharged from the surface of the core probe through the through hole 61, thereby improving the detection sensitivity of the product.

[0041] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An ultrasonic liquid level detection module, characterized in that: include: A shell, wherein the shell is concavely provided with an inner cavity, a piezoelectric ceramic sheet and a circuit board are provided in the inner cavity, the piezoelectric ceramic sheet is electrically connected to the circuit board, the circuit board is led out of the inner cavity through a signal line, and a potting glue is provided on the circuit board, and the potting glue confines the circuit board in the inner cavity; The shell is provided with a detection surface, the detection surface is covered with a rubber sleeve, and the rubber sleeve is a coupling layer; the detection surface is away from the opening of the inner cavity.

2. The ultrasonic liquid level detection module according to claim 1, characterized in that: An annular step portion is provided in the inner cavity, and the step portion divides the inner cavity into a first accommodating cavity and a second accommodating cavity. The first accommodating cavity is close to the detection surface, the piezoelectric ceramic sheet is arranged in the first accommodating cavity, and the circuit board is arranged in the second accommodating cavity.

3. The ultrasonic liquid level detection module according to claim 2, characterized in that: The piezoelectric ceramic sheet is bonded to the bottom of the first accommodating cavity, close to the detection surface.

4. The ultrasonic liquid level detection module according to claim 2, characterized in that: The step portion is provided with a first fool-proof portion and a second fool-proof portion, and the first fool-proof portion and the second fool-proof portion are protruded from the inner wall of the second accommodating cavity.

5. The ultrasonic liquid level detection module according to claim 4, characterized in that: The circuit board is provided with a notch, and the notch is clamped with the first fool-proof portion, so that the circuit board is fixed in the second accommodating cavity.

6. The ultrasonic liquid level detection module according to claim 4, characterized in that: The second fool-proofing portion is provided with a guiding portion near the opening of the inner cavity, and the circuit board enters the second accommodating cavity through the guiding portion, and the side edge of the circuit board abuts against the second fool-proofing portion.

7. The ultrasonic liquid level detection module according to claim 4, characterized in that: A third fool-proofing portion is also provided on the step portion, and the top surface of the third fool-proofing portion is a plane, and the top surface abuts against the bottom surface of the circuit board to prevent the circuit board from sinking.

8. The ultrasonic liquid level detection module according to claim 1, characterized in that: The rubber sleeve is provided with a plurality of through holes, and the through holes are used to discharge the air between the rubber sleeve and the detection surface when the rubber sleeve is in contact with the detection surface, so that the rubber sleeve is in close contact with the detection surface.

9. The ultrasonic liquid level detection module according to claim 1, characterized in that: The shell is a round boss-shaped structure, a first boss and a second boss connected to the first boss are arranged on the outer side of the shell, the diameter of the first boss is smaller than the diameter of the second boss, and the detection surface is arranged on the first boss.

10. The ultrasonic liquid level detection module according to claim 9, characterized in that: The rubber sleeve is sleeved on the outer side of the first boss.

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