CN219064608U

CN219064608U - Vortex shedding flowmeter sensor probe shell structure

Info

Publication number: CN219064608U
Application number: CN202223473361.7U
Authority: CN
Inventors: 唐贤昭; 徐斌
Original assignee: Jiangsu Wini Electronic Co ltd
Current assignee: Jiangsu Wini Electronic Co ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-05-23
Anticipated expiration: 2032-12-26

Abstract

The utility model discloses a vortex shedding flowmeter sensor probe shell structure, which comprises a shell and is characterized in that the shell comprises an upper section, a middle section and a lower section from top to bottom, wherein a detector packaging cavity is arranged at the upper section and the middle section, the top of the detector packaging cavity is opened, the inner side of the detector packaging cavity is divided into three sections, a thread screwing section, a gravity block placing section and a piezoelectric crystal placing section are respectively arranged from top to bottom, and the diameters of the thread screwing section, the gravity block placing section and the piezoelectric crystal placing section are sequentially reduced; the lower section is a flat probe tail, and the middle section is a round table-shaped stress conduction section for connecting the probe tail and the upper section; a sloping surface section is arranged between the middle section and the upper section. The middle section is in a round table shape, and the slope section is arranged between the middle section and the upper section, so that vortex street force can be intensively conducted to the piezoelectric crystal at the slope section.

Description

Vortex shedding flowmeter sensor probe shell structure

Technical Field

The utility model relates to the field of sensors, in particular to a vortex shedding flowmeter sensor probe shell structure.

Background

The sensor probe of the vortex shedding flowmeter is positioned behind the vortex generator. The pressure pulse caused by the vortex separation causes stress to the sensor probe, and a corresponding change in charge is generated by a detecting element embedded inside the sensor probe, i.e. the detecting element detects the vortex pressure pulse and converts it into an electrical pulse signal.

The shell of the sensor probe of the vortex shedding flowmeter is directly contacted with the vortex of the medium and is a component for transmitting pressure pulses caused by vortex separation to the piezoelectric crystal, so that the structure of the sensor probe directly influences the sensitivity and the signal to noise ratio of the vortex shedding flowmeter. It is an important component of vortex shedding flowmeter.

The patent number is 201310127834.4, which discloses a 'prior replacement type induction vortex shedding flowmeter', and the appearance of a sensor shell can be seen to adopt a cylindrical structure, so that vortex shedding force is dispersed and transmitted to a piezoelectric crystal, and the signal-to-noise ratio of the sensor is reduced; the inner cavity in the prior art adopts a cylindrical cavity structure, and the piezoelectric crystal is directly fixed in the cavity by glue; the piezoelectric crystal is inconvenient to replace after being damaged.

Disclosure of Invention

The utility model aims to provide a vortex shedding flowmeter sensor probe shell structure.

The utility model has the innovation point that the middle section is in a round table shape, and a slope section is arranged between the middle section and the upper section, so that vortex street force can be intensively conducted to the piezoelectric crystal at the slope section.

In order to achieve the above purpose, the technical scheme of the utility model is as follows: the utility model provides a vortex shedding flowmeter sensor probe shell structure, includes the casing, and the casing includes upper segment, middle section and hypomere from top to bottom, upper segment, middle section department are equipped with the encapsulation of detection body chamber, detection body encapsulation chamber open-top, detection body encapsulation intracavity is divided into three sections, from top to bottom respectively be threaded section, gravity piece place section, piezoelectricity crystal and shelve the section, threaded section, gravity piece place section, piezoelectricity crystal shelve the section diameter and reduce in proper order; the lower section is a flat probe tail, and the middle section is a truncated cone-shaped stress conduction section for connecting the probe tail and the upper section; a sloping surface section is arranged between the middle section and the upper section.

Further, a reinforcing rib is arranged at the position of the tail near the stress conducting section of the probe. The strength of the probe tail is enhanced, and the efficiency of the conduction intensity of the probe tail is improved.

Further, the upper section is divided into two sections, namely an upper boss section and a lower transition section; the top of the boss section is provided with a plurality of positioning holes. The boss section increases the intensity of screw thread section of connecing soon, makes moreover and forms a ladder between boss section and the changeover portion, when the sensor is installed, forms sealed face in ladder department, and the orientation of probe tail and piezocrystal's direction of placing can be fixed to the locating hole.

Further, the number of the positioning holes is two. The piezoelectric crystal is used for fixing and positioning a pressure tool when being placed.

Further, the diameter of the transition section decreases from top to bottom. Strength can be ensured under the action of reducing gravity; the quality of the sensor is reduced and the resonance frequency of the sensor is increased.

The beneficial effects of the utility model are as follows:

1. the middle section is in a round table shape, and the slope section is arranged between the middle section and the upper section, so that vortex street force can be intensively conducted to the piezoelectric crystal at the slope section.

Drawings

FIG. 1 is a schematic cross-sectional view of the present utility model.

Fig. 2 is a schematic structural view of the present utility model.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

Example 1: as shown in fig. 1 and 2, the probe shell structure of the vortex shedding flowmeter comprises a shell, wherein the shell comprises an upper section 1, a middle section 2 and a lower section 3 from top to bottom, a detector packaging cavity 4 is arranged at the positions of the upper section 1 and the middle section 2, the top of the detector packaging cavity 4 is opened, the inner side of the detector packaging cavity 4 is divided into three sections, a thread screwing section 4.1, a gravity block placing section 4.2 and a piezoelectric crystal placing section 4.3 are respectively arranged from top to bottom, and the diameters of the thread screwing section 4.1, the gravity block placing section 4.2 and the piezoelectric crystal placing section 4.3 are sequentially reduced; the lower section 3 is a flat probe tail, and the middle section 2 is a round table-shaped stress conduction section for connecting the probe tail with the upper section 1; the tail near stress conducting section of the probe is provided with a reinforcing rib 6. A slope surface section 5 is arranged between the middle section 2 and the upper section 1. The upper section 1 is divided into two sections, namely an upper boss section 1.1 and a lower transition section 1.2; the diameter of the transition piece 1.2 decreases from top to bottom. The top of the boss section 1.1 is provided with a plurality of positioning holes 7, and two positioning holes 7 are arranged.

When in operation, the device comprises: the vortex street force is transmitted to the stress conduction section 2 through the induction of the tail of the probe, the stress conduction section 2 transmits the vortex street force to the piezoelectric crystal in the packaging cavity 4 of the detection body, the piezoelectric crystal converts the vortex street force into a vortex street electric signal, and the vortex street electric signal is processed by the processing unit and converted into output of a flow signal.

During installation, the piezoelectric crystal is placed in the piezoelectric crystal placing section 4.3 in the detection body packaging cavity 4, the gravity block is placed at the gravity block placing section 4.2, the gravity placing block 4.2 is propped up by using an installation tool, three feet are arranged on the installation tool, two feet are placed in the positioning holes, one foot is propped up against the gravity block, the gravity block and the piezoelectric crystal are prevented from rotating, the feet propping up against the gravity block are sleeved with nuts provided with external threads, and then the gravity block is screwed in the thread screwing section 4.3.

The described embodiments are only a partial embodiment of the utility model and not an all-segment embodiment. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Claims

1. The utility model provides a vortex shedding flowmeter sensor probe shell structure, includes the casing, and its characterized in that, the casing includes upper segment, middle section and hypomere from top to bottom, upper segment, middle section department are equipped with the encapsulation of detection body chamber, detection body encapsulation chamber open-top, detection body encapsulation intracavity is divided into three sections, from top to bottom respectively be threaded section, gravity piece place section, piezoelectricity crystal rest section, threaded section, gravity piece place section, piezoelectricity crystal rest section diameter reduce in proper order; the lower section is a flat probe tail, and the middle section is a truncated cone-shaped stress conduction section for connecting the probe tail and the upper section; a sloping surface section is arranged between the middle section and the upper section.

2. The vortex shedding flowmeter sensor probe housing structure of claim 1, wherein the probe tail near stress conducting section is provided with reinforcing ribs.

3. The vortex shedding flowmeter sensor probe housing structure of claim 1, wherein the upper section is divided into two sections, an upper boss section and a lower transition section; the top of the boss section is provided with a plurality of positioning holes.

4. A vortex shedding flowmeter sensor probe housing structure as claimed in claim 3, wherein there are two of said positioning holes.

5. The vortex shedding flowmeter sensor probe housing structure of claim 4, wherein the diameter of the transition section decreases from top to bottom.