CN212903390U

CN212903390U - Pressure sensor type flowmeter

Info

Publication number: CN212903390U
Application number: CN202021689298.9U
Authority: CN
Inventors: 孙柏君; 桑晓鸣; 刘文卓
Original assignee: Hunan Hande Shite Instrument Co ltd
Current assignee: Hunan Hande Shite Instrument Co ltd
Priority date: 2020-08-14
Filing date: 2020-08-14
Publication date: 2021-04-06
Anticipated expiration: 2030-08-14

Abstract

The utility model provides a pressure sensor formula flowmeter. The pressure sensor type flowmeter comprises a data acquisition mechanism arranged outside a measuring pipe and a measuring mechanism arranged in the measuring pipe, wherein the measuring mechanism comprises a cross beam, a shaft sleeve, a sliding rod, a spring, a pressure sensor and a target sheet; the two beams are respectively fixed at different positions of the inner wall of the measuring tube, the two beams are respectively provided with one shaft sleeve, the slide bar penetrates through the shaft holes of the two shaft sleeves simultaneously in a structure capable of sliding relatively, the tail end of the slide bar after penetrating through one of the shaft sleeves is sequentially connected with the spring and the pressure sensor, the pressure sensor is fixedly connected with the close one beam or the shaft sleeve, and the target sheet is fixed at the position of the slide bar between the two shaft sleeves. The utility model provides a pressure sensor formula flowmeter has solved the relatively poor, the inconvenient, the low problem of measurement accuracy of flow calculation of anti overload capacity that current target flowmeter exists.

Description

Pressure sensor type flowmeter

Technical Field

The utility model relates to a flowmeter field, concretely relates to pressure sensor formula flowmeter.

Background

The basic working principle of the target flowmeter is as follows: the target sheet installed in the measuring chamber is acted by the impact force of the fluid when the fluid passes through to generate a displacement, the displacement and the flow speed (impact force) of the fluid form a strict function relationship, and the velocity of the fluid can be calculated by measuring the displacement, so that the flow of the fluid is further obtained. In order to ensure that the force applied to the target is substantially equal to the impulse of the fluid, no friction is allowed to exist during the displacement, which would otherwise cause errors. The target rod of the conventional target flowmeter adopts a cantilever beam structure.

However, the structure of fixing the target plate by using the cantilever beam has the following disadvantages:

1. the cantilever beam is easy to damage when resisting large impact and has poor overload resistance;

2. when the target sheet is displaced, the target sheet rotates relative to the supporting point of the target rod, the flow area brought by the displacement is nonlinear, and the inherent mathematical formula description is difficult to find;

3. because the target rod is in a cantilever beam structure, the target rod is difficult to stay at a certain fixed position under the action of factors such as inertia and the like, but vibrates back and forth within a certain range, and when the flow velocity of fluid changes violently, the vibration is particularly obvious, so that the actual displacement of the target plate and the theoretical displacement have larger deviation, and the measurement precision of the flowmeter is reduced.

SUMMERY OF THE UTILITY MODEL

The technical problem that anti overload capacity is relatively poor, flow calculation is inconvenient, measurement accuracy is low for solving the target flowmeter of prior art existence, the utility model provides a solve the pressure sensor formula flowmeter of above-mentioned problem.

A pressure sensor type flowmeter comprises a data acquisition mechanism arranged outside a measuring pipe and a measuring mechanism arranged in the measuring pipe, wherein the measuring mechanism comprises a cross beam, a shaft sleeve, a sliding rod, a spring, a pressure sensor and a target sheet; the two beams are respectively fixed at different positions of the inner wall of the measuring tube, the two beams are respectively provided with one shaft sleeve, the slide bar penetrates through the shaft holes of the two shaft sleeves simultaneously in a structure capable of sliding relatively, the tail end of the slide bar after penetrating through one of the shaft sleeves is sequentially connected with the spring and the pressure sensor, the pressure sensor is fixedly connected with the close one beam or the shaft sleeve, and the target sheet is fixed at the position of the slide bar between the two shaft sleeves.

In a preferred embodiment of the pressure sensor-based flow meter provided in the present invention, the cross beam is along the radial arrangement of the measuring tube, and both ends are connected to the inner wall of the measuring tube.

In a preferred embodiment of the pressure sensor-type flowmeter of the present invention, two of the shaft holes of the shaft sleeve are axially coincident with each other, and the shaft holes are in clearance fit with the slide bars.

In a preferred embodiment of the pressure sensor-based flowmeter of the present invention, the slide bar has one end penetrating the shaft sleeve and connected to the spring in sequence, the pressure sensor has the other end not penetrating the shaft sleeve and abutting the position-limiting head in the shaft hole.

In a preferred embodiment of the pressure sensor type flowmeter provided by the present invention, the target is a conical structure, the conical axial direction coincides with the axial direction of the slide bar, and the conical tip is directed away from the end of the pressure sensor. The inner wall of the measuring tube is of a step-shaped structure and comprises a thick layer and a thin layer, the thin layer is arranged at one end close to the pressure sensor, and the edge of the target sheet is in butt joint with the two layers.

The utility model provides a pressure sensor formula flowmeter's a preferred embodiment, survey buret still is equipped with two sets of pressure measurement passageways, respectively in survey intraductal position by both ends runs through its inner wall, and extend to with data acquisition mechanism communicates.

The utility model provides a pressure sensor formula flowmeter's a preferred embodiment, every group the pressure measurement passageway all includes many the pressure measurement passageway, many the pressure measurement passageway in different positions on the same cross section in the measuring tube run through its inner wall. The data acquisition mechanism is provided with a micro differential pressure sensor connected with the pressure measuring channel.

Compared with the prior art, the utility model provides a pressure sensor formula flowmeter has cancelled "cantilever beam arm" and has connected target piece formula structure, has eliminated the influence of target pole to the measurement accuracy, has improved the stability of measurement. Through setting up the target plate drives slide bar axial displacement, drive the structure of spring compression can reach power buffering and hysteretic effect, offsets because of the measuring error that the fluid fluctuation brought in the pipeline, improves measurement accuracy and stability. And when the flow is calculated, no mechanical moving part exists, no abrasion and no noise exist basically, and the service life is greatly prolonged. The utility model provides a target flowmeter that foil gage ring shape distributes can replace current target flowmeter basically to this structure is compatible multinomial sensor structure, and the effectual sensor application range of widening can be favorable to the development of each industry.

Compared with the prior art, the utility model provides a target flowmeter that foil gage annular distributes has still adopted little differential pressure sensor, calculates through measuring pipeline differential pressure value before and after when little flow, and its minimum measurement range can drop to 0.5m year/h, can improve present target flowmeter flow range ratio to 1:50 (because of present MEMS technical development is rapid, the differential pressure sensor precision has promoted 0.1% FS, minimum measurement range has promoted 500 Pa), enlarges the application range with the model, is favorable to user's lectotype and cost saving.

Drawings

FIG. 1 is a perspective view of a pressure sensor-type flow meter;

FIG. 2 is a perspective view of a front section of a measurement tube in a pressure sensor-based flow meter;

FIG. 3 is an exploded view of a measurement mechanism in a pressure sensor-based flow meter;

fig. 4 is a longitudinal sectional view of a measuring mechanism in the pressure sensor type flowmeter.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1 to 4, a perspective view of the pressure sensor type flowmeter 1 and the front section 31 of the measuring tube 3, an exploded view of the measuring mechanism 5, and a longitudinal sectional view of the pressure sensor type flowmeter 1 are shown respectively. Fig. 4 omits the structure of the head part in the data acquisition mechanism 4 for convenience of illustration.

The pressure sensor type flowmeter 1 comprises a pipeline 2, a measuring pipe 3, a data acquisition mechanism 4, a measuring mechanism 5 and a pressure measuring channel 7.

The outside of the pipeline 2 is provided with the data acquisition mechanism 4, and a data acquisition plate 41 and other components are arranged in the data acquisition mechanism. Be equipped with in pipeline 2 survey buret 3 is including anterior segment 31, middle section 32, the back end 33 that connects gradually. The inner diameters of the front section 31 and the rear section 33 are consistent, and the outer diameters of the front section and the rear section are consistent and are abutted with the inner wall of the pipeline 2; the outer diameter of the middle section 32 is smaller and the outer wall is communicated with the cavity in the data acquisition mechanism 4.

The front section 31 is arranged at one end, close to the upstream in the flowing direction of the fluid, in the pipeline 2, the inner wall of the front section is provided with three pressure measuring channels 7, and the starting points of the three pressure measuring channels are all positioned on the same cross section of the front section 31 and are respectively positioned at trisection positions; it runs through behind the inner wall of anterior segment 31, extends in its inside to the position of middle section 32 to run through out in the terminal surface of anterior segment 31, to the outer wall of middle section 32, with the cavity intercommunication in the data acquisition mechanism 4.

The measuring mechanism 5 comprises a front cross beam 51, a rear cross beam 52, a front shaft sleeve 53, a rear shaft sleeve 54, a sliding rod 55, a spring 56, a pressure sensor 57 and a target sheet 58.

The front sleeve 53 is of a bullet-shaped structure, and one end of the front sleeve, which is close to the upstream of the fluid flowing in the pipe, is conical, and a shaft hole penetrating the whole is axially arranged inside the front sleeve. The front bushing 53 is disposed at a position upstream of the front section 31, and both sides thereof are connected to the inner wall of the front section 31 through one front cross member 51, respectively, so as to be fixed at a position where the axial hole thereof is coaxial with the front section 31.

The rear axle sleeve 54 is similar to the front axle sleeve 53 in structure, but is one turn larger in size, and is fixed at both sides to the edge of the front section 31 near the middle section 32 by the rear cross member 52. Two ends of the sliding rod 55 are respectively inserted into the shaft holes of the front shaft sleeve 53 and the rear shaft sleeve 54 and are in clearance fit sliding connection with the shaft holes. Wherein, the shaft hole of the front bushing 53 is provided with a stopper at the end near the upstream end to prevent the sliding rod 55 from protruding.

The rear boss 54 is enlarged in size in a shaft hole at a downstream portion thereof to form a cavity for accommodating the pressure sensor 57. The slide rod 55 is inserted into the rear bushing 54, and then is sequentially connected to the spring 56 and the pressure sensor 57. The side surface of the rear shaft sleeve 54 and the end surface of the middle section 32 close to the front section 31 are both provided with openings for the circuit of the pressure sensor 7 to extend into the data acquisition mechanism 4 and be connected with the data acquisition board 41.

The target plate 58 is a cone-shaped structure, and is fixedly sleeved outside the section of the sliding rod 55 between the front shaft sleeve 53 and the rear shaft sleeve 54, the axial direction of the cone is coaxial with the sliding rod 55, and the tip of the cone faces to the front shaft sleeve 53. The inner wall structure of the front section 31 is also changed adaptively to form two layers of a thick layer and a thin layer, the thin layer is disposed at the end near the rear axle sleeve 54, and the edge of the target sheet 58 abuts against the step at the thick-thin junction.

The rear section 33 is arranged at one end of the pipeline 2 close to the downstream of the flowing direction of the fluid, and the inner wall of the rear section is also provided with three pressure measuring channels 7 which are symmetrical with the front section 31. The three starting point end openings of the pressure measuring channel 7 arranged on the front section 31 and the three starting point end openings of the pressure measuring channel 7 arranged on the rear section 33 are respectively positioned on three straight lines which are parallel to the axial direction.

In specific implementation, the fluid flows through the front section 31, the middle section 32, and the rear section 33 in sequence, and the target sheet 58 is set at a throttle position, so that a pressure difference is formed between the front and rear surfaces. When the pressure difference is small and is not enough to trigger the pressure sensor 57, the micro differential pressure sensor obtains pressure difference data through the pressure measuring channel 7, and then the flow is calculated; when the pressure difference continues to rise until the pressure sensor 57 generates a signal, a signal is output to the data acquisition board 41, and the flow rate is calculated.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes made by the present specification can be changed, or directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.

Claims

1. The utility model provides a pressure sensor formula flowmeter, including set up in surveying the outside data acquisition mechanism of buret, set up in survey intraductal measuring mechanism, its characterized in that: the measuring mechanism comprises a beam, a shaft sleeve, a sliding rod, a spring, a pressure sensor and a target sheet; the two beams are respectively fixed at different positions of the inner wall of the measuring tube, the two beams are respectively provided with one shaft sleeve, the slide bar penetrates through the shaft holes of the two shaft sleeves simultaneously in a structure capable of sliding relatively, the tail end of the slide bar after penetrating through one of the shaft sleeves is sequentially connected with the spring and the pressure sensor, the pressure sensor is fixedly connected with the close one beam or the shaft sleeve, and the target sheet is fixed at the position of the slide bar between the two shaft sleeves.

2. The pressure sensor-based flowmeter of claim 1, wherein: the crossbeam is arranged along the radial direction of survey buret, both ends with survey buret inner wall is connected.

3. The pressure sensor-based flowmeter of claim 1, wherein: the axial directions of the shaft holes of the two shaft sleeves are overlapped, and the shaft holes are in clearance fit with the sliding rod.

4. The pressure sensor-based flowmeter of claim 1, wherein: one end of the sliding rod penetrates through the shaft sleeve and is sequentially connected with the spring and the pressure sensor, and the other end of the sliding rod does not penetrate through the other shaft sleeve and is abutted to a limiting head arranged in a shaft hole of the shaft sleeve.

5. The pressure sensor-based flowmeter of claim 1, wherein: the target sheet is of a conical structure, the axial direction of the cone coincides with the axial direction of the sliding rod, and the tip of the cone faces to one end far away from the pressure sensor.

6. The pressure sensor-based flowmeter of claim 4, wherein: the inner wall of the measuring tube is of a step-shaped structure and comprises a thick layer and a thin layer, the thin layer is arranged at one end close to the pressure sensor, and the edge of the target sheet is in butt joint with the two layers.

7. The pressure sensor-type flowmeter of any one of claims 1 to 6, wherein: the measuring tube is also provided with two groups of pressure measuring channels which respectively penetrate through the inner wall of the measuring tube at the positions close to the two ends in the measuring tube and extend to be communicated with the data acquisition mechanism.

8. The pressure sensor-based flowmeter of claim 7, wherein: each group of pressure measuring channels comprises a plurality of pressure measuring channels, and the pressure measuring channels penetrate through the inner wall of the measuring tube at different positions on the same cross section of the measuring tube.

9. The pressure sensor-based flowmeter of claim 7, wherein: the data acquisition mechanism is provided with a micro differential pressure sensor connected with the pressure measuring channel.