CN219266184U

CN219266184U - Piezoelectric transducer structure of ultrasonic liquid concentration sensor

Info

Publication number: CN219266184U
Application number: CN202321298992.1U
Authority: CN
Inventors: 孙琳斐; 刘烨玮; 赵文浩
Original assignee: Zibo Yuhan Electronic Technology Co ltd
Current assignee: Zibo Yuhan Electronic Technology Co ltd
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2023-06-27
Anticipated expiration: 2033-05-26

Abstract

The utility model relates to a piezoelectric transducer structure of an ultrasonic liquid concentration sensor, belonging to the technical field of ultrasonic transducers; the piezoelectric transducer assembly is connected with an external gasket and a pressing plate through locking bolts, and is connected with the filtering reflecting plate through the locking bolts; the sensor has reasonable structural design, can detect the change of the concentration of the liquid in real time, is convenient to assemble and manufacture, can work again by replacing the corresponding components after the components are damaged, reduces the production and manufacturing cost, and has better product reliability; according to the utility model, the filter screen is added on the filtering reflecting plate, so that impurities in the liquid are reduced to enter the detection working area of the transducer, the influence of the impurities on ultrasonic signals is avoided, and further error monitoring is avoided; and the filtering reflecting plate is connected through the locking bolt, so that the filtering reflecting plate is convenient to replace.

Description

Piezoelectric transducer structure of ultrasonic liquid concentration sensor

Technical Field

The utility model relates to a piezoelectric transducer structure of an ultrasonic liquid concentration sensor, and belongs to the technical field of ultrasonic transducers.

Background

Because of the needs of industrial production, a plurality of liquid concentration measuring methods have been researched at home and abroad at present, wherein the ultrasonic liquid concentration sensing technology is more and more focused by people due to the simple principle and convenient realization, and is also applied in various aspects. Ultrasonic waves can penetrate almost everything except vacuum, and various chemical analyses can be performed by utilizing the propagation of ultrasonic waves in a medium to be tested. The existing piezoelectric transducer assembly structural design has some defects, the production and manufacturing cost is high, the waveform of the piezoelectric transducer assembly is influenced when impurities exist in liquid, after an internal piezoelectric ceramic piece is damaged, the whole piezoelectric transducer assembly can be abandoned, and the later maintenance cost is high.

For example, in chinese patent publication No. CN215931752U, publication No. 2022, 3 and 1, a high-precision urea concentration quality sensor is provided, aiming at the problems that when measuring the concentration quality of urea liquid for vehicles, the liquid in a urea tank is unstable to shake, bubbles are easy to generate, the temperature of the urea liquid is uneven during low-temperature heating, three factors affecting accurate measurement of ultrasonic waves are three factors, the measurement is inaccurate, the error is large, and a false alarm occurs in a detection system.

The high-precision urea concentration mass sensor comprises a hexagonal shell, a round shell, a small water tank, a large water tank and a pagoda piece, and is characterized in that: the hexagonal shell and the round shell are integral shells made of stainless steel materials. The side of the round shell is provided with a water tank with unequal sizes, a piezoelectric crystal is bonded at the bottom C in the hexagonal shell to form an ultrasonic sensor, a temperature sensor is arranged, the distance between the point C and the point D on the bottom surface of the round shell is the sound distance of ultrasonic waves, the ultrasonic sensor is connected with an ultrasonic metering module, a singlechip and a display module through signal lines in a pagoda, the propagation speed in urea liquid is calculated through the time difference of receiving and sending signals of the ultrasonic sensor, temperature compensation calculation processing is carried out through the temperature sensor, and the singlechip is used for calculating the accurate concentration value of the urea liquid according to different sound speeds of the ultrasonic waves in the urea liquid.

However, the problem that the waveform is affected when impurities exist in the liquid, and when the internal piezoelectric ceramic plates are damaged, the whole piezoelectric transducer assembly is abandoned, and the later maintenance cost is high is not solved.

Disclosure of Invention

The utility model aims to solve the technical problems that: the piezoelectric transducer structure of the ultrasonic liquid concentration sensor is provided to solve the problem that the waveform of the ultrasonic liquid concentration sensor is influenced when impurities exist in liquid, and when an internal piezoelectric ceramic piece is damaged, the whole piezoelectric transducer assembly is abandoned, and the later maintenance cost is high.

The piezoelectric transducer structure of the ultrasonic liquid concentration sensor comprises a piezoelectric transducer assembly and a filtering reflecting plate, wherein the piezoelectric transducer assembly is connected with an external gasket and a pressing plate through a locking bolt, and the piezoelectric transducer assembly is connected with the filtering reflecting plate through the locking bolt.

Preferably, the piezoelectric transducer assembly comprises an upper cover and a lower shell which are sequentially arranged, threaded holes which are matched with the locking bolts are formed in the upper cover and the lower shell, and the upper cover and the lower shell are assembled through threads of a sealing tube.

Preferably, the lower housing is connected to the upper cover by external threads on the circumferential outer wall.

Preferably, the lower shell is sealed with the sealing ring by coating thread glue.

Preferably, the lower shell is internally pressed with a transducer colloid.

Preferably, the center of the upper cover is extended with a tower nozzle, and the tower nozzle is provided with a wire bundle hole penetrating through the upper cover.

Preferably, the filter reflecting plate is internally provided with a butt joint column, and the top of the butt joint column is fixedly connected with the pressing plate, the gasket, the upper cover and the lower shell through locking bolts.

Compared with the prior art, the utility model has the following beneficial effects:

1. the sensor has reasonable structural design, can detect the change of the concentration of the liquid in real time, is convenient to assemble and manufacture, can work again by replacing the corresponding components after the components are damaged, reduces the production and manufacturing cost, and has better product reliability.

2. The energy converter on the market adopts laser welding to seal the top cover after the potting adhesive, and this mode consumes more time, and the cost is higher, and the heat that laser welding produced can produce certain influence to the energy converter. The threaded connection upper cover with the wire bundle hole can solve the problem, the upper cover and the lower shell are connected and fastened by adopting the sealing pipe threads, and the threaded connection is more tightly and tightly sealed by a method of coating thread glue on the threads and placing a sealing ring.

3. According to the utility model, the filter screen is added on the filtering reflecting plate, so that impurities in the liquid are reduced to enter the detection working area of the transducer, the influence of the impurities on ultrasonic signals is avoided, and further error monitoring is avoided; and the filtering reflecting plate is connected through the locking bolt, so that the filtering reflecting plate is convenient to replace.

Drawings

FIG. 1 is a schematic structural diagram of a piezoelectric transducer structure of an ultrasonic liquid concentration sensor according to the present utility model;

FIG. 2 is a schematic view of a lower housing according to the present utility model;

FIG. 3 is a schematic view of a top cover according to the present utility model;

FIG. 4 is a schematic view of a filtering reflector according to the present utility model;

fig. 5 is a schematic cross-sectional view of an upper cover according to the present utility model.

In the figure: 1. a locking bolt; 2. a pressing plate; 3. a gasket; 4. an upper cover; 5. a seal ring; 6. a lower housing; 7. a filtering reflection plate; 8. a threaded hole; 9. an external thread; 10. pagoda mouth; 11. a wire bundle hole; 12. butt-joint columns; 13. a filter screen; 14. and (5) an internal thread.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

example 1

As shown in fig. 1 to 5, the utility model designs a piezoelectric transducer structure of an ultrasonic liquid concentration sensor, which comprises a piezoelectric transducer assembly, a filtering reflecting plate 7, a locking bolt 1, and a gasket 3 and a pressing plate 2, wherein the top of the gasket is connected with the outside. The piezoelectric transducer assembly is connected with the pressing plate 2 through the locking bolt 1 and the external gasket 3, and the piezoelectric transducer assembly is connected with the filtering reflecting plate 7 through the locking bolt 1.

Because each subassembly is connected through lock bolt 1, each subassembly equipment preparation is convenient, has the subassembly to damage the back, and the accessible is changed corresponding subassembly, can make the sensor work again, has reduced manufacturing cost, and has better product reliability.

Specifically, the piezoelectric transducer assembly comprises a lower shell 6 capable of bearing piezoelectric ceramics and colloid, a sealing ring 5 and a threaded connection upper cover 4 with a wire harness hole 11, wherein the lower shell 6 is screwed and assembled with the upper cover 4 with an internal thread 14 through a sealing pipe through an external thread 9 on the outer circumferential wall, is sealed with the sealing ring 5 through coating the thread colloid, and is used for pressing and fixing the colloid in the transducer in the lower shell 6; the center of the threaded connection upper cover 4 is extended with a pagoda nozzle 10, the pagoda 10 is provided with a wire harness hole 11 penetrating through the threaded connection upper cover, wires are led out through the wire harness hole 11, the gasket 3 and the pressing plate 2 are provided with holes to be installed and need to be aligned with the position of the threaded connection upper cover 4, the filtering reflecting plate 7 is fixedly connected through the locking bolt 1, and the top of the butt joint column 12 is fixedly connected with the pressing plate 2, the gasket 3, the threaded connection upper cover 4 and the lower shell 6 through the locking bolt 1.

As shown in fig. 1, the piezoelectric transducer assembly includes an upper cover 4 and a lower housing 6 that are sequentially disposed, threaded holes 8 that are adapted to the locking bolts 1 are formed in the upper cover 4 and the lower housing 6, and the upper cover 4 and the lower housing 6 are screwed together through seal pipes.

As shown in fig. 2, the lower housing 6 is screwed to the upper cover 4 by external threads 9 on the outer circumferential wall, and the lower housing 6 is sealed with the seal ring 5 by applying a screw-thread compound. The lower shell 6 is internally pressed with an inherent transducer colloid. The lower housing 6 is screwed to the upper cap 4 by means of external threads 9 on the circumferential outer wall, avoiding the various problems of laser welding to seal the cap.

As shown in fig. 3, a tower nozzle 10 extends from the center of the upper cover 4, and a wire harness hole 11 penetrating through the upper cover 4 is formed in the tower nozzle 10.

As shown in fig. 4, the filter reflection plate 7 is internally provided with a butt joint column 12, and the top of the butt joint column 12 is fixedly connected with the pressing plate 2, the gasket 3, the upper cover 4 and the lower shell 6 through the locking bolt 1. The filter screen 13 is added through the filtering and reflecting plate 7, so that the impurity in the liquid enters into a working area detected by the transducer, and the influence of the impurity on ultrasonic signals and error monitoring are avoided. And is connected by a locking bolt 1, so that the component is easy to replace.

Of course, the foregoing is merely preferred embodiments of the present utility model and is not to be construed as limiting the scope of the embodiments of the present utility model. The present utility model is not limited to the above examples, and those skilled in the art will appreciate that the present utility model is capable of equally varying and improving within the spirit and scope of the present utility model.

Claims

1. The utility model provides an ultrasonic wave liquid concentration sensor piezoelectric transducer structure, includes piezoelectric transducer subassembly, its characterized in that still includes filtering reflecting plate (7), piezoelectric transducer subassembly passes through locking bolt (1) and connects outside gasket (3) and clamp plate (2), piezoelectric transducer subassembly passes through locking bolt (1) and connects filtering reflecting plate (7).

2. The piezoelectric transducer structure of the ultrasonic liquid concentration sensor according to claim 1, wherein the piezoelectric transducer assembly comprises an upper cover (4) and a lower shell (6) which are sequentially arranged, threaded holes (8) which are matched with the locking bolts (1) are formed in the upper cover (4) and the lower shell (6), and the upper cover (4) and the lower shell (6) are assembled through sealing pipe threads in a screwing mode.

3. The ultrasonic liquid concentration sensor piezoelectric transducer structure according to claim 2, wherein the lower housing (6) is screwed to the upper cover (4) by external threads (9) on the circumferential outer wall.

4. A piezoelectric transducer structure of an ultrasonic liquid concentration sensor according to claim 3, characterized in that the lower housing (6) is sealed with a sealing ring (5) by means of a thread-coating.

5. The ultrasonic liquid concentration sensor piezoelectric transducer structure according to claim 2, wherein the lower case (6) is internally pressurized with a transducer colloid.

6. The piezoelectric transducer structure of the ultrasonic liquid concentration sensor according to claim 2, wherein a pagoda nozzle (10) extends from the center of the upper cover (4), and a wire harness hole (11) penetrating through the upper cover (4) is formed in the pagoda nozzle (10).

7. The piezoelectric transducer structure of the ultrasonic liquid concentration sensor according to claim 2, wherein a butt joint column (12) is arranged inside the filtering and reflecting plate (7), and the top of the butt joint column (12) is fixedly connected with the pressing plate (2), the gasket (3), the upper cover (4) and the lower shell (6) through the locking bolt (1).