Transducer assembly for ultrasonic flowmeter

Abstract

The utility model discloses a transducer assembly for an ultrasonic flowmeter. The transducer assembly comprises a pressing plate, an elastic sealing piece and a stainless steel transducer, wherein the pressing plate is provided with a mounting hole; the pressing plate is made of a Teflon material, a first through hole is formed in the middle of the pressing plate, and a step-shaped first annular concave part surrounding the first through hole is arranged on the upper side of the pressing plate; the elastic sealing piece comprises a base part and an annular protruding part located on the upper side of the base part, and a containing groove is formed by the annular protruding part. The diameter of the base part is larger than that of the annular lug boss; a second through hole is formed in the middle of the base part; the base part is arranged in the first annular concave part, the lower section of the stainless steel transducer is arranged in the containing groove, the annular convex part wraps the peripheral wall of the lower section of the stainless steel transducer, and a cable of the stainless steel transducer penetrates through the first through hole and the second through hole to extend outwards; the structure of the pressing plate and the elastic sealing piece can absorb vibration and impact while providing installation support, the anti-impact and damping effects are achieved, and signals are made to be more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic flowmeters, in particular to a transducer assembly for an ultrasonic flowmeter. Background Art

[0002] As a key sensing element, ultrasonic transducers are widely used in fields such as ultrasonic water meters and cleaning equipment. However, the existing transducer installation methods have many problems in practical applications. Especially in the flow channel environment, the installation structure of the transducer cannot effectively buffer external oscillations and the interference of the airflow in the flow channel, resulting in poor stability and inaccurate test data under test conditions.

[0003] Patent (CN218600618U) discloses an in-built transducer and an ultrasonic water meter. The in-built transducer improves the acoustic wave intensity and signal consistency by setting a signal excitation surface on the outer wall of the installation cavity and designing an annular isolation groove on the periphery of the signal excitation surface.

[0004] Patent (CN201329356Y) discloses a transducer installation structure, which proposes an installation structure for fixing the transducer through a metal sheet and a bakelite board, aiming to improve the ultrasonic transmission efficiency and avoid the problem of electric leakage.

[0005] Patent CN207872573U) discloses a conical ultrasonic transducer fixing member, which fixes the transducer through a conical structure and a screw, solving the deficiencies of the traditional bonding method and welding method, but does not mention how to buffer external oscillations and the interference of the airflow in the flow channel, and cannot meet the requirements for the stability of the transducer in the flow channel environment.

[0006] The existing transducer installation methods have the following problems in the flow channel environment:

[0007] When the transducer is installed in the flow channel, it cannot effectively buffer mechanical vibrations or impacts, resulting in the transducer being prone to loosening or displacement under high-frequency vibrations. The airflow fluctuations in the flow channel will directly act on the surface of the transducer. Especially in a high-speed airflow environment, the transducer is also easily affected by this impact, resulting in signal drift or errors of the transducer under test conditions. Summary of the Utility Model

[0008] The technical problem to be solved by the utility model is to provide a transducer assembly for an ultrasonic flowmeter that can reduce the influence of impacts and vibrations and has more stable and accurate testing.

[0009] The technical solution adopted by the utility model to solve the above technical problem is as follows: A transducer assembly for an ultrasonic flowmeter, characterized in that:

[0010] It includes a pressing plate provided with an installation hole, an elastic sealing member, and a stainless steel transducer;

[0011] The pressing plate is made of Teflon. A first through hole is provided in the middle of the pressing plate, and a stepped first annular recess surrounding the first through hole is provided on the upper side of the pressing plate;

[0012] The elastic seal includes a base portion and an annular raised portion located on the upper side of the base portion. The annular raised portion forms a receiving groove; the diameter of the base portion is larger than that of the annular raised portion, and a second through hole is provided in the middle of the base portion;

[0013] The base portion is placed in the first annular recess, the lower section of the stainless steel transducer is placed in the receiving groove, the annular raised portion wraps the outer peripheral wall of the lower section of the stainless steel transducer, and the cable of the stainless steel transducer passes through the first through hole and the second through hole and extends outwards.

[0014] The preferred technical solution adopted by the present utility model to solve the above technical problems is: a stepped second annular recess surrounding the second through hole is provided at the bottom of the receiving groove, and a protrusion matching the second annular recess is provided at the bottom of the stainless steel transducer.

[0015] The preferred technical solution adopted by the present utility model to solve the above technical problems is: the elastic seal is made of fluorosilicone rubber.

[0016] The preferred technical solution adopted by the present utility model to solve the above technical problems is: the bottom of the stainless steel transducer and the second annular recess are adhesively bonded by dispensing glue.

[0017] The preferred technical solution adopted by the present utility model to solve the above technical problems is: the base portion includes a cylindrical section located on the upper side and a frustum section located on the lower side. The diameter of the frustum section gradually decreases from top to bottom, and the conical surface of the frustum section and the bottom surface of the base portion are transitioned by an annular arc surface.

[0018] The preferred technical solution adopted by the present utility model to solve the above technical problems is: the outer diameter of the annular raised portion gradually increases from top to bottom.

[0019] The preferred technical solution adopted by the present utility model to solve the above technical problems is: an annular convex rib is provided at the bottom of the base portion. The position of the annular convex rib is the same as that of the second annular recess. The outer peripheral wall of the annular convex rib is inclined and extends towards the root, and the outer peripheral wall of the annular convex rib is located outside the inner wall of the second annular recess.

[0020] The preferred technical solution adopted by the present utility model to solve the above technical problems is: a convex ring is provided at the lower part of the outer shell of the stainless steel transducer. The receiving groove includes a large inner diameter portion at the lower side and a small inner diameter portion at the upper side, and the convex ring is embedded in the large inner diameter portion.

[0021] The preferred technical solution adopted by the present utility model to solve the above technical problems is as follows: The pressing plate has a rhomboid-like structure. The first through hole and the first annular recess form a concentric circular installation part, and there is an installation hole on each side of the installation part in the long axis direction.

[0022] The preferred technical solution adopted by the present utility model to solve the above technical problems is as follows: There is a notch on each side of the installation part in the short axis direction, and the upper edge of the notch extends to the upper surface of the pressing plate, and the lower edge extends to be flush with the first annular recess.

[0023] Compared with the prior art, the advantages of the present utility model are as follows: The pressing plate is made of Teflon material. The Teflon material has a certain rigidity, which can ensure that the transducer is stably installed in the flow channel. It is not very hard, and its flexibility enables it to absorb the impact and vibration generated during the installation process, playing a certain role in shock and vibration prevention, protecting the transducer from excessive mechanical stress, ensuring the stability of signal transmission, and thus prolonging the service life of the transducer.

[0024] The structural design of the elastic seal can effectively prevent liquid or gas leakage, ensure that the medium in the flow channel does not enter the inside of the transducer assembly, and improve the overall sealing performance and reliability. The elastic seal has good elasticity, and the stainless steel transducer is installed inside it in the form of wrapping the lower section. The annular protrusion of the elastic seal wraps the lower section of the stainless steel transducer, providing installation support while being able to absorb vibration and impact, playing a role in shock and vibration prevention, and further protecting the transducer. In addition, through the shock absorption effect of the elastic seal, the transducer is more stable and reliable when transmitting signals, reducing signal distortion caused by mechanical vibration. Description of the Drawings

[0025] The present utility model will be further described in detail below in conjunction with the drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be used as a limitation on the scope of the present utility model. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0026] Figure 1 It is an overall schematic diagram of a transducer assembly for an ultrasonic flowmeter Figure 1 ;

[0027] Figure 2 It is an overall schematic diagram of a transducer assembly for an ultrasonic flowmeter Figure 2 ;

[0028] Figure 3 It is an exploded schematic diagram of a transducer assembly for an ultrasonic flowmeter Figure 1 ;

[0029] Figure 4 Schematic decomposition diagram of a transducer assembly for an ultrasonic flowmeter Figure 2 ;

[0030] Figure 5 Schematic decomposition diagram of a transducer assembly for an ultrasonic flowmeter Figure 3 ;

[0031] Figure 6 Cross-sectional view of a transducer assembly for an ultrasonic flowmeter;

[0032] Figure 7 Exploded cross-sectional view of a transducer assembly for an ultrasonic flowmeter.

[0033] Reference numerals:

[0034] Mounting hole 1; pressing plate 10; elastic seal 20; stainless steel transducer 30; first through hole 2; first annular recess 3; base 21; annular protrusion 22; receiving groove 4; second through hole 5; cable 40; second annular recess 6; protrusion 7; cylindrical section 211; frustum section 212; annular arc surface 213; annular rib 210;

[0035] Convex ring 8; large inner diameter part 401; small inner diameter part 402; notch 9. Detailed implementation manners

[0036] The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary, and should not be construed as limiting the protection scope of the present utility model.

[0037] It should be noted that: Similar reference numerals represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it will not be further defined and explained in subsequent drawings.

[0038] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. The terms "first" and "second" are only for the convenience of description and have no other directional meaning, and should not be used as a limitation to the present utility model.

[0039] As Figure 1As shown in the figure, this embodiment provides a transducer assembly for an ultrasonic flowmeter, which includes a pressure plate 10 provided with a mounting hole 1, an elastic seal 20, and a stainless steel transducer 30.

[0040] As Figure 3 shown in the figure, the pressure plate 10 is made of Teflon. A first through hole 2 is provided in the middle of the pressure plate 10, and a stepped first annular recess 3 surrounding the first through hole 2 is provided on the upper side of the pressure plate 10.

[0041] As Figure 2 shown in the figure, the elastic seal 20 includes a base 21 and an annular raised portion 22 located on the upper side of the base 21, and a receiving groove 4 formed by the annular raised portion 22. The diameter of the base 21 is larger than that of the annular raised portion 22, and a second through hole 5 is provided in the middle of the base 21.

[0042] As Figures 3 - 6 shown in the figure, the base 21 is placed in the first annular recess 3, the lower section of the stainless steel transducer 30 is placed in the receiving groove 4, the annular raised portion 22 of the elastic seal 20 wraps the outer peripheral wall of the lower section of the stainless steel transducer 30, and the cable 40 of the stainless steel transducer 30 extends outward through the first through hole 2 and the second through hole 5.

[0043] The pressure plate 10 is made of Teflon. The Teflon material has a certain rigidity, which can ensure that the transducer is stably installed in the flow channel. It is not very hard, and its flexibility enables it to absorb the impact and vibration generated during the installation process, playing a certain role in shock and vibration prevention, protecting the transducer from excessive mechanical stress, ensuring the stability of signal transmission, and thus extending the service life of the transducer.

[0044] At the same time, because the Teflon material has excellent heat resistance and low temperature resistance. The pressure plate 10 can remain stable in the temperature range of -200°C to 250°C, so it can maintain the installation stability in a more demanding installation environment. In addition, the Teflon material is hardly corroded by any chemical reagents and will not adhere to petroleum deposits due to being in the gas of petroleum products for a long time, so it is more conducive to the stability of the structure.

[0045] In addition, the structural design of the elastic seal 20 can effectively prevent liquid or gas leakage, ensure that the medium in the flow channel does not enter the inside of the transducer assembly, and improve the overall sealing performance and reliability. The elastic seal 20 has good elasticity. The stainless steel transducer 30 is installed inside it in the form of being wrapped by the lower section. The annular raised portion 22 of the elastic seal 20 wraps the lower section of the stainless steel transducer 30, providing installation support and being able to absorb vibration and shock, playing a role in shock and vibration prevention, and further protecting the transducer. In addition, through the shock absorption effect of the elastic seal 20, the transducer is more stable and reliable when transmitting signals, reducing signal distortion caused by mechanical vibration.

[0046] AsFigures 3 - 7 As shown, a stepped second annular recess 6 surrounding the second through-hole 5 is provided at the bottom of the accommodation groove 4, and a protrusion 7 matching the second annular recess 6 is provided at the bottom of the stainless steel transducer 30. This concave-convex fitting structure can effectively limit the radial displacement between the stainless steel transducer 30 and the elastic seal 20, ensuring a more stable connection between the two and preventing loosening caused by vibration or impact. Through the concave-convex fitting structure, even if there are certain dimensional deviations during the installation process, they can be compensated by the fitting structure, thereby reducing the requirements for installation accuracy.

[0047] As Figure 6 shown, 7 The bottom of the stainless steel transducer 30 and the second annular recess 6 are adhesively bonded by dispensing glue. Preferably, the bottom wall and the annular wall of the second annular recess 6 are connected by an arc, thereby forming a position where glue is easily accumulated, further enhancing the effect of dispensing glue and ensuring a firm connection between the stainless steel transducer 30 and the elastic seal 20. Dispensing glue bonding not only improves the connection stability but also effectively prevents liquid or gas from seeping in from the connection, extending the service life of the component.

[0048] As Figures 1 - 7 shown, the elastic seal 20 is made of fluorosilicone rubber. Fluorosilicone rubber has excellent weather resistance, corrosion resistance, and solvent resistance, and is suitable for the application scenario of gas ultrasonic flowmeters.

[0049] As Figure 7 shown, the base 21 includes a cylindrical section 211 on the upper side and a frustum section 212 on the lower side. The diameter of the frustum section 212 gradually decreases from top to bottom, and the conical surface of the frustum section 212 and the bottom surface of the base 21 are transitioned by an annular arc surface 213. This can not only ensure that the elastic seal 20 with the stainless steel transducer 30 embedded can be more smoothly and undamagedly embedded into the first annular recess 3 of the pressing plate 10, but also ensure that the extrusion between the two is tighter, further improving the stability and reliability of the component.

[0050] As Figures 6 - 7 shown, the outer diameter of the annular protrusion 22 gradually increases from top to bottom. The design of the gradually changing outer diameter not only makes the annular wall of the annular protrusion 22 stronger and not easily damaged, extending the service life of the elastic seal 20. Moreover, it can make the aperture form an inwardly wrapped acting force, making the annular protrusion 22 hold the stainless steel transducer 30 more firmly.

[0051] As Figure 4 shown, 6, as shown in FIGS. 6 and 7, an annular rib 210 is provided at the bottom of the base 21. The position of the annular rib 210 corresponds to the second annular recess 6. The outer peripheral wall of the annular rib 210 is inclined and extends towards the root, and the outer peripheral wall of the annular rib 210 is located outside the inner wall of the second annular recess 6. The setting of the annular rib 210 strengthens the structure of the entire elastic seal 20. In addition, the annular rib 210 is embedded in the first through hole 2, which further strengthens the connection between the pressing plate 10 and the elastic seal 20.

[0052] As Figure 3 , 4 , as shown in FIGS. 6 and 7, a convex ring 8 is provided at the lower part of the housing of the stainless steel transducer 30. The receiving groove 4 includes a large inner diameter part 401 at the lower side and a small inner diameter part 402 at the upper side, and the convex ring 8 is embedded in the large inner diameter part 401. Through this setting, it is very difficult for the stainless steel transducer 30 to come out of the elastic seal 20, making the combination of the two more firm and improving the reliability of the assembly.

[0053] As Figure 3 , 4 shown, the pressing plate 10 has a rhomboid-like structure. The first through hole 2 and the first annular recess 3 form a mounting portion with a concentric circle structure, and a mounting hole 1 is provided on each side of the mounting portion in the long axis direction.

[0054] As Figures 1 - 5 shown, a notch 9 is provided on each side of the mounting portion in the short axis direction. The upper edge of the notch extends to the upper surface of the pressing plate 10, and the lower edge extends to be flush with the first annular recess 3.

[0055] The setting of the notch 9 provides an expansion gap for the elastic seal 20, improves the adaptability of the pressing plate 10 while ensuring the connection firmness, and thus reduces the requirements for the dimensional accuracy of the stainless steel transducer 30 and the elastic seal 20. In addition, the setting of the notch also forms a concave hole groove structure here, and this hole groove structure can be used to cooperate with the corresponding convex structure at the installation position of the flow channel to form a positioning mechanism. In addition, the notch design makes the pressing plate 10 have a certain elasticity during the installation process, can adapt to different installation environments, and further improves the versatility and reliability of the assembly.

[0056] The transducer assembly for an ultrasonic flowmeter provided by the present invention is introduced. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the present invention and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A transducer assembly for an ultrasonic flow meter, characterized in that: It includes a pressure plate with a mounting hole, an elastic seal and a stainless steel transducer; The pressing plate is made of Teflon material, a first through hole is provided in the middle of the pressing plate, and a first stepped annular recessed portion surrounding the first through hole is provided on the upper side of the pressing plate; The elastic sealing member comprises a base and an annular protrusion located on the upper side of the base, the annular protrusion forms a receiving groove; the base has a diameter larger than the annular protrusion, and a second through hole is provided in the middle of the base; The base is placed in the first annular recessed portion, the lower section of the stainless steel transducer is placed in the accommodating groove, the annular protrusion wraps the outer peripheral wall of the lower section of the stainless steel transducer, and the cable of the stainless steel transducer passes through the first through hole and the second through hole to extend outward.

2. The transducer assembly for an ultrasonic flow meter according to claim 1, characterized in that: A stepped second annular recessed portion surrounding the second through hole is provided at the bottom of the accommodating groove, and a protrusion matching the second annular recessed portion is provided at the bottom of the stainless steel transducer.

3. The transducer assembly for an ultrasonic flow meter according to claim 1, characterized in that: The elastic sealing element is made of fluorosilicone rubber.

4. The transducer assembly for an ultrasonic flow meter according to claim 2, characterized in that: The bottom of the stainless steel transducer is bonded to the second annular recessed portion by glue point bonding.

5. The transducer assembly for an ultrasonic flow meter according to claim 1, characterized in that: The base includes a cylindrical section located on the upper side and a frustum section located on the lower side. The diameter of the frustum section gradually decreases from top to bottom. The conical surface of the frustum section and the bottom surface of the base are transitioned through an annular arc surface.

6. The transducer assembly for an ultrasonic flow meter according to claim 1, characterized in that: The outer diameter of the annular protrusion gradually increases from top to bottom.

7. The transducer assembly for an ultrasonic flow meter according to claim 2, characterized in that: An annular ridge is provided at the bottom of the base, and the position of the annular ridge is consistent with the second annular recess. The outer peripheral wall of the annular ridge is inclined to expand toward the root, and the outer peripheral wall of the annular ridge is located outside the inner wall of the second annular recess.

8. The transducer assembly for an ultrasonic flow meter according to claim 2, characterized in that: A convex ring is provided at the lower part of the housing of the stainless steel transducer, the accommodating groove comprises a large inner diameter portion at the lower side and a small inner diameter portion at the upper side, and the convex ring is embedded in the large inner diameter portion.

9. The transducer assembly for an ultrasonic flow meter according to claim 1, characterized in that: The pressure plate has a rhombus-like structure, the first through hole and the first annular recess form a mounting portion with a concentric circle structure, and a mounting hole is provided on each of the two sides of the mounting portion in the long axis direction.

10. The transducer assembly for an ultrasonic flow meter according to claim 9, characterized in that: A notch is respectively provided on both sides of the mounting portion in the direction of the minor axis, the upper edge of the notch extends to the upper surface of the pressing plate, and the lower edge extends to be flush with the first annular recessed portion.

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