Ultrasonic liquid level meter probe

Abstract

The utility model discloses an ultrasonic liquid level meter probe, which comprises a hollow inner tube suitable for invading a measured medium so as to form a medium path; the piezoelectric element is arranged on the outer wall of the hollow inner pipe; the exhaust hole is formed in the surface of the probe, the exhaust hole is communicated with the hollow inner pipe, and the connecting section of the exhaust hole and the hollow inner pipe is a curved surface; the hollow inner pipe is sleeved with the outer sleeve, and the outer sleeve and the lower end of the hollow inner pipe are arranged in a sealed mode. The connecting section of the hollow inner pipe and the exhaust hole is arranged to be the curved surface, so that when the exhaust hole is produced and machined to be communicated downwards, the exhaust hole only needs to be communicated to the curved surface, and compared with existing common right-angle connection, the precision requirement in the assembling and machining process is lowered, the production efficiency and the product yield are improved, and the production cost is reduced. And the curved surface avoids the phenomena of fluid vortex and dead angles easily generated in a traditional right-angle connection mode, scale deposition possibly generated after long-term use can be prevented, and follow-up maintenance is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of material level measurement, specifically relates to an ultrasonic liquid level meter. BACKGROUND

[0002] As a kind of high-precision, safe and reliable and environmental protection energy-saving liquid level measurement technology, ultrasonic liquid level meter is providing reliable solution for the liquid level monitoring needs of various industries. It can determine liquid level height by emitting ultrasonic pulse to liquid surface, receiving reflected echo and calculating time difference. It has been widely used in chemical industry, water treatment, food storage tank and other scenes.

[0003] In the probe rod of contact type ultrasonic liquid level meter, an inner core inner tube is usually arranged to form a fluid medium path, so that the fluid interface in the fluid medium path can be measured by piezoelectric element, and then liquid level information is calculated. Therefore, the fluid medium path needs to be provided with an exhaust pipeline to realize the evacuation of air and other gases in the fluid medium path, realize air pressure balance and accurate measurement.

[0004] The information disclosed in the background section of this document is only intended to increase the understanding of the overall background of the present utility model, and should not be regarded as acknowledging or in any form implying that the information constitutes prior art known to those skilled in the art. UTILITY MODEL CONTENT

[0005] The utility model aims at providing an ultrasonic liquid level meter probe rod structure, which can simplify production assembly process, realize better production efficiency, and is not easy to produce effusion to affect measurement accuracy in long-term use, and is convenient to maintain.

[0006] In order to achieve the above purpose, the technical scheme provided by a specific embodiment of the utility model is as follows:

[0007] An ultrasonic liquid level meter probe rod, comprising: a hollow inner tube adapted to intrude into measured medium to form a medium path; a piezoelectric element arranged on the outer wall of the hollow inner tube; an exhaust hole opened on the surface of the probe rod, the exhaust hole is communicated with the hollow inner tube, and the connecting section of the exhaust hole and the hollow inner tube is curved; an outer sleeve tube is sleeved on the outer wall of the hollow inner tube and is sealingly arranged with the lower end of the hollow inner tube.

[0008] In the above ultrasonic liquid level meter probe rod, the connecting section and the hollow inner tube are fully penetrated butt joint, and the penetration depth h satisfies: h≥1.2 times the thickness of the tube wall.

[0009] The ultrasonic liquid level meter probe further comprises a threading hole connected with the wire lumen at the upper end of the probe, and a cable in the wire lumen is connected with the piezoelectric element through the threading hole; and a glue filling hole adapted to receive glue injection to achieve glue sealing of the region between the hollow inner tube and the outer sleeve.

[0010] In the ultrasonic liquid level meter probe, the wire lumen is arranged in an extension tube of the probe, and the extension tube is adapted to adjust the length.

[0011] In the ultrasonic liquid level meter probe, the exhaust hole is obliquely connected to the connecting section, and the slope angle is 10-20°.

[0012] In the ultrasonic liquid level meter probe, the curvature radius R of the curved connecting section is equal to the radius of the hollow inner tube.

[0013] In the ultrasonic liquid level meter probe, the ratio of the inner diameter d of the exhaust hole to the inner diameter D of the hollow inner tube satisfies d / D=0.2-0.9.

[0014] In the ultrasonic liquid level meter probe, the surfaces of the hollow inner tube, the connecting section and the exhaust hole are passivated.

[0015] In the ultrasonic liquid level meter probe, the piezoelectric elements are arranged in two pieces in one group in parallel or side by side on the outer wall of the hollow inner tube core pipe, or are arranged in a single piece in horizontal or vertical distribution.

[0016] Compared with the prior art, the ultrasonic liquid level meter probe has the following advantages: the connecting section of the hollow inner tube and the exhaust hole is a curved surface, so when the exhaust hole is punched down, it only needs to be punched to the curved surface, compared with the common right-angle connection, the precision requirement during assembly and processing is reduced, the production efficiency and product yield are improved, the curved surface avoids the fluid vortex and dead angle phenomenon that is prone to occur in the traditional right-angle connection mode, can prevent the fouling that may occur after long-term use, and is convenient for subsequent maintenance.

[0017] Further, the curved connecting section and the hollow inner tube are connected by full penetration butt welding, instead of the conventional socket welding, so that the fluid path at the connection of the two is effectively prevented from leaking or breaking due to the weakness of the welding position. At the same time, the welding method meeting the penetration requirement can ensure the continuity and smoothness of the fluid path at the connection, avoiding the interference of welding residues or welding defects on the flow of fluid medium. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0019] Figure 1 It is an external schematic view of the ultrasonic liquid level meter probe in an embodiment of the present application.

[0020] Figure 2 It is a sectional view of the ultrasonic liquid level meter probe in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the person skilled in the art better understand the technical solutions in the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0022] In addition, in the present application, words such as "first", "second" and the like are mainly used to distinguish one technical feature from another technical feature, and do not necessarily require or imply a certain actual relationship, quantity or order between the technical features.

[0023] In the detailed description of the specification, the drawings forming a part thereof show by way of example the exemplary embodiments and wherein like reference numbers indicate identical parts. It should be understood that other embodiments can be utilized and structural or logical changes can be made without departing from the scope of the present application. Therefore, the following detailed description should not be taken as limiting.

[0024] Various operations can be described as multiple discrete actions or operations in a manner that is most helpful in understanding the claimed subject matter. However, the order of description should not be construed as to imply that these operations are necessarily order-dependent. Specifically, these operations can not be performed in the order presented. The described operations can be performed in a different order from that described. Various additional operations can be performed and / or described operations can be omitted in additional embodiments.

[0025] For the purposes of this application, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this application, the phrase "A, B, and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0026] Various components, devices, etc. can be referred to herein in singular form or in the plural form, but this is merely for convenience and brevity, and one of skill in the art will understand that when a singular form is used, this includes the plural, and vice versa.

[0027] The specification describes using the phrases "in one embodiment" or "in other embodiments" or "in some embodiments", which can each refer to one or more of the same or different embodiments. Furthermore, the terms "comprising", "including", "having" and the like, as used with respect to embodiments of the present application, are synonymous.

[0028] Figure 1 And Figure 2 As shown, the ultrasonic liquid level meter probe in an embodiment of the present application is in an overall elongated rod structure, which includes a hollow inner tube 1, an exhaust hole 2, a piezoelectric element 3, an outer sleeve 4 and other related auxiliary structures. The lower end of the hollow inner tube 1 is open to the end of the medium to be measured, and its inner diameter can be optimized according to the actual measurement requirements and the characteristics of the fluid medium, forming a stable medium path suitable for the smooth flow of the fluid medium. The material of the hollow inner tube 1 is selected from high-strength, corrosion-resistant stainless steel or special engineering plastics, etc. to meet the use requirements in different working conditions, such as in the strong acid and alkali environment of the chemical industry, a special acid and alkali resistant stainless steel material is used to effectively prolong the service life of the probe.

[0029] The piezoelectric element 3 is arranged on the outer wall of the hollow inner tube 1. In a specific implementation, the piezoelectric element 3 is firmly attached to the outer wall of the hollow inner tube 1 by a paste connection method, and the type of adhesive includes epoxy resin glue, conductive silver glue or silicone rubber, etc. The thickness of the adhesive layer is controlled to ensure good electrical connection and mechanical stability, while not causing unnecessary obstruction and energy loss to the propagation of ultrasonic waves. The connection method of the piezoelectric element 3 and the outer wall of the hollow inner tube 1 can also be mechanical fixation or welding fixation, etc., which all belong to the protection scope of the present scheme, and will not be described here.

[0030] An exhaust hole 2 is formed on the side of the probe. The exhaust hole 2 communicates with the hollow inner tube 1, and the connecting section 5 of the exhaust hole 2 and the hollow inner tube 1 is curved. The exhaust hole 2 is located in the upper middle part of the hollow inner tube 1 to ensure that the air in the tube can be effectively exhausted when the probe invades the measured medium, achieving air pressure balance. In the prior art, the applicant finds that the exhaust hole setting of the existing ultrasonic liquid level meter (such as CN104215300B, CN105387910B, CN117824785A, etc.) is basically horizontally arranged and then communicated to the hollow inner tube. The problem brought by this is that dirt is likely to accumulate at the curved surface in the long-term use, especially at the curved surface. The curved surface connection of the present application can effectively guide the smooth flow of fluid medium between the hollow inner tube and the exhaust hole, avoiding the vortex and dead angle phenomenon that is likely to occur in the traditional straight connection mode. The vortex not only causes fluid energy loss, slows down the response speed of measurement, and affects the measurement accuracy, but also easily causes impurity deposition in the long-term use, thereby affecting the performance and service life of the probe. The curved surface connection of the connecting section 5 in the present embodiment enables the fluid medium to flow at a relatively uniform speed and direction through the smooth transition structure, reduces fluid resistance, improves air pressure balance efficiency, and ensures the stability of the fluid medium in the hollow inner tube and the reliability of the measurement signal. In addition, from the perspective of processing technology, the design of the curved surface connecting section 5 also greatly reduces the precision requirement for punching the exhaust hole 2 in the production and assembly process. In the traditional straight connection mode, the punching of the exhaust hole needs to accurately control the punching depth and angle, and slight deviation may cause poor communication or damage to the structure of the hollow inner tube. The existence of the curved surface connecting section 5 makes the punching operation have a larger processing fault tolerance space, and the exhaust hole 2 only needs to be punched to the curved surface to realize communication, which not only improves the production efficiency and reduces the production cost, but also significantly improves the yield of the product, which is conducive to large-scale production and quality control.

[0031] The curved surface design of the connecting section of the exhaust hole 2 and the hollow inner tube 1 in the present embodiment is preferable. In the present embodiment, the curvature radius R of the connecting section 5 curved surface is equal to the radius of the hollow inner tube 1. When the curvature radius R is greater than the inner tube radius, the curved surface transition area will form a clear "step" (similar to the drop of a step), causing vortex or stagnation area (dead zone) in the flow process of the fluid. Moreover, in the welding connection, the wall thickness at the connection between the curved surface and the inner tube may be uneven. For example, the curvature mismatch may make the local area material too thin, causing stress concentration when vibrating or changing temperature, and finally causing cracks or even structural failure. If an asymmetric curved surface (such as a quarter of a hemisphere) is used, the welding boundary of the connecting section curved surface may deviate from the center axis, which will cause difficulty in adjusting the welding angle in terms of structural strength. Therefore, based on the above, the present embodiment preferentially selects the setting that the curvature radius R of the connecting section 5 curved surface is equal to the radius of the hollow inner tube 1.

[0032] In this example, the ratio of the inner diameter d of the vent hole 2 to the inner diameter D of the hollow inner tube 1 satisfies: d / D = 0.2 to 0.9. If the ratio is too small, i.e., the vent hole 2 is too narrow, it may lead to increased resistance to gas discharge. If the ratio is too large, such as when the vent hole 2 is close to the size of the hollow inner tube 1, it may lead to processing difficulties. Therefore, the preferred range is 0.2 to 0.9.

[0033] In this example, the exhaust port 2 is inclinedly connected to the curved surface of the connecting segment 5. Based on the applicant's consideration of the length of the probe body and exhaust efficiency under most working conditions, the slope angle between the exhaust port 2 and the vertical direction is set to 10°–20°. Further, this slope angle is preferably 16°.

[0034] The piezoelectric element 3 is made of high-performance piezoelectric ceramic material, which has a high electromechanical coupling coefficient and good frequency response characteristics. It can quickly and accurately convert electrical energy into ultrasonic mechanical vibration, and efficiently convert it back into an electrical signal when receiving ultrasonic echoes, providing an accurate data basis for subsequent liquid level calculation.

[0035] Two piezoelectric elements 3 are arranged in a group on the outer wall of the hollow inner core 1 tube, either side-by-side or arranged in parallel; they can also be arranged horizontally or vertically as a single element. The dual-element design generates a superposition effect of sound waves through synchronous drive, which can enhance the emission energy, making it particularly suitable for long-distance or high-viscosity media penetration requirements. The single-element design has relatively weaker signal strength and is suitable for industrial environments with lower accuracy requirements. The dual-element parallel design prioritizes performance and is suitable for complex industrial scenarios; the single-element arrangement focuses on cost and space adaptability. The choice between the two requires a trade-off between measurement requirements, media characteristics, and installation conditions.

[0036] An outer tube 4, housing the probe, is fitted over the hollow inner tube 1 and sealed to the lower end of the inner tube 1. For example, an end cap 6 can be used for sealing, thus providing physical protection for the probe's interior. The material of the outer tube 4 can be selected according to the application scenario, such as corrosion-resistant metal or high-strength engineering plastic, providing sufficient protection without affecting the overall performance of the probe.

[0037] In this embodiment, the connecting section 5 curved surface and the hollow inner tube 1 are connected by full penetration butt welding. Further, the penetration depth h can be set to satisfy h≥1.2 times the tube wall thickness, realizing firm combination between the connecting section 5 curved surface and the hollow inner tube 1, thereby being conducive to the structural stability of the probe under load conditions such as fluid pressure and mechanical vibration in the long-term use process, effectively preventing problems such as leakage or rupture caused by weak welding sites. At the same time, the welding method meeting the penetration depth requirement can ensure the continuity and smoothness of the fluid path at the connection, avoiding interference of welding residues or welding defects on the flow of fluid medium, further reducing fluid resistance and vortex generation. In addition, this welding process also has good sealing performance, which can effectively prevent foreign matter and gas from invading from the welding site, and enhance the protection capability of the probe.

[0038] The connecting section 5 curved surface in the hollow inner tube 1 and the surface of the exhaust hole 2 are passivated to form corrosion resistance and reduce the adhesion of fluid medium on the surface of the probe, so that the liquid is difficult to stay and accumulate on the surface, further preventing the occurrence of liquid accumulation phenomenon. Without affecting the overall structure and function of the probe, the self-cleaning ability and durability of the probe can be significantly improved.

[0039] In the upper end portion of the probe, a threading hole 7 and a glue pouring hole 8 auxiliary structure are also provided. The threading hole 7 is in communication with a wire lumen 9 at the upper end of the probe, and the wire lumen 9 is arranged in an extension tube 10 of the probe. The length of the extension tube 10 can be flexibly adjusted according to actual needs to meet the needs in different measurement scenarios and meet the requirements of various storage tank heights and installation positions. The cable is electrically connected with the piezoelectric element 3 from the wire lumen 9 through the threading hole 7, and the threading process adopts waterproof and moisture-proof processing technology to ensure the reliability of the line connection. The glue pouring hole 8 is used to accept the glue injection operation, and the sealant is injected into the area between the hollow inner tube 1 and the outer sleeve tube 4 to form a dense sealing layer, realizing complete waterproof, moisture-proof and corrosion-resistant performance inside the probe, effectively protecting the internal elements and improving the stability and reliability of the probe in harsh environments.

[0040] When liquid level measurement is needed, the ultrasonic liquid level meter probe slowly and stably invades into the measured medium. As the probe gradually penetrates, the measured medium begins to flow upwards along the hollow inner tube 1. At this time, due to the design of the exhaust hole 2 in communication with the hollow inner tube 1 and the connecting section 5 curved surface, the air in the tube can be smoothly discharged without stagnation, and the medium gradually fills the hollow inner tube to form a stable medium path. In this process, the piezoelectric element 3 is in standby state, ready to receive control signals to start the ultrasonic wave transmission and reception cycle at any time.

[0041] The utility model discloses a kind of ultrasonic liquid level meter probe, hollow inner tube 1 and the connecting section 5 of exhaust hole 2 are set as curved surface by being connected, thus when producing and processing exhaust hole is punched down, only need to punch on the curved surface, compared with the common right-angle connection, reduce the precision requirement when assembling and processing, improve production efficiency and product yield ratio, and curved surface avoids the fluid vortex and dead angle phenomenon that easily produce under traditional right-angle connection mode, can prevent scale that possibly produce after long-term use, facilitate subsequent maintenance.

[0042] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application should be defined by the appended claims rather than the above description, and it is intended to include all changes falling within the meaning and scope of equivalents of the claims. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0043] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. An ultrasonic liquid level meter probe, characterized by, The utility model relates to a kind of probe, including: Hollow inner tube, suitable for invading the medium to be measured, to form medium path; Piezoelectric element is arranged on the outer wall of the hollow inner tube; Exhaust hole is opened in the surface of probe, the exhaust hole is communicated with the hollow inner tube, and the connecting section of the exhaust hole and the hollow inner tube is curved surface; Outer sleeve, sleeve is set in the hollow inner tube outside, and is sealed with the lower end of the hollow inner tube.

2. The ultrasonic liquid level meter probe of claim 1, wherein, The connecting section and the hollow inner tube are all fusion penetration butt joint, and the penetration depth h satisfies: h=1.2 times pipe wall thickness.

3. The ultrasonic liquid level meter probe of claim 1, wherein, Also including: Threading hole, connected with the wire lumen of the upper end of probe, cable in wire lumen is connected with piezoelectric element via the threading hole; Glue injection hole is suitable for receiving glue injection, so that the area between the hollow inner tube and the outer sleeve is sealed by glue.

4. The ultrasonic liquid level meter probe of claim 3, wherein, The wire lumen is arranged in the extension tube of probe;The extension tube is suitable for length adjustment.

5. The ultrasonic liquid level meter probe of claim 1, wherein, The exhaust hole is obliquely connected to the connecting section, and the slope angle is 10°-20°.

6. The ultrasonic liquid level meter probe of claim 1, wherein, The curvature radius R of the curved surface connecting section is equal to the radius of hollow inner tube.

7. The ultrasonic liquid level meter probe of claim 1, wherein, The ratio of the exhaust hole inner diameter d and the hollow inner tube inner diameter D satisfies: d / D=0.2-0.

9.

8. The ultrasonic liquid level meter probe of claim 1, wherein, The surface of the hollow inner tube, the connecting section and the exhaust hole is passivated.

9. The ultrasonic liquid level meter probe of claim 1, wherein, The piezoelectric element is arranged in two pieces on the outer wall of the hollow inner core tube, and is arranged side by side or in parallel;Or single piece transverse or vertical arrangement distribution.

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