CN201034645Y

CN201034645Y - Multi-point support type V awl flow rate sensor

Info

Publication number: CN201034645Y
Application number: CNU2007200695133U
Authority: CN
Inventors: 李兴化
Original assignee: SHANGHAI KENT INTELLIGENCE METER CO Ltd
Current assignee: SHANGHAI KENT INTELLIGENCE METER CO Ltd
Priority date: 2007-04-29
Filing date: 2007-04-29
Publication date: 2008-03-12
Anticipated expiration: 2017-04-29

Abstract

The utility model discloses a multi-point supporting type V-conical flow sensor relating to measurement technology field, which is aimed to solve the technical problem of supporting inner cone body for V-conical flow sensor. The V-conical flow sensor comprises a surface body, an inner cone body, a low-pressure piezometric port, a high-pressure piezometric port, a support tube, which is characterized in that the flow sensor also includes a front support part consisting of three front ribs which are provided with intervals of 120 DEG with one end of each front rib fixedly arranged on the front end of the inner cone body while the other end fixedly arranged at the inside of the surface body; a back support part consisting of three back ribs which are provided with intervals of 120 DEG with one end of each back rib fixedly arranged on the back end of the inner cone body while the other end fixedly arranged at the inside of the surface body. Stop blocks are arranged at the surface body where the front and the back ribs are arranged. The utility model ensures the stability and accuracy of measuring low-pressure region, therefore ensuring enough intensity for connecting inner cone body and prolonging service life of the whole machine.

Description

Multipoint support type V-cone flow sensor

Technical Field

The utility model relates to a measurement technology, in particular to a fixed supporting technology of a V cone of an industrial automation instrument, namely a V cone flow sensor.

Background

The V-cone flow sensor (hereinafter referred to as sensor) in the prior art is composed of a meter body 5, an inner cone (throttling element) 4, a low-pressure-taking port 2, a high-pressure-taking port 1, a support tube (low-pressure-leading tube) 3 and the like (see fig. 1). SensingThe flow meter is a novel differential pressure type flow meter, can accurately measure fluid under various flow conditions in a wide Reynolds number range, and carries out flow measurement according to the Bernoulli equation of the conservation of energy of the fluid in continuous flow in a closed pipeline. I.e. in the same closed pipeline, when the flowing medium is close to the cone, its pressure is P ₊ (high pressure zone) when the medium passes through the throttling area of the inner cone, the flow velocity is increased and the pressure is reduced to P _- When the flow velocity (flow rate) changes, the differential pressure value will increase or decrease. That is, for a steady fluid, the magnitude of the flow is proportional to the square root of the differential pressure. The hollow arrows in the figure indicate the direction of fluid flow.

The unique conical throttling physical structure (inner cone) of the sensor not only enlarges the measuring range of the medium flow, but also has the special structure of fluid rectification, so the requirement on a straight pipe section in the process flow is very low, and the sensor is completely different from other differential pressure type flowmeters which need a very long straight pipe section to ensure a stable flow field. The sensor not only has the advantages of good stability and strong universality of the traditional differential pressure type flowmeter, but also avoids the limitations (such as small range, low measurement precision, harsh installation conditions and the like) of the traditional differential pressure type flowmeter.

The flow rate and differential pressure are related as follows:

in the formula:

q _v -volumetric flow rate

Density under rho-fluid conditions

c-efflux coefficient

Epsilon-gas expansion coefficient (incompressible fluids such as water, oil, etc.. Epsilon = 1)

Delta p-differential pressure value

The differential pressure value of the sensor is determined by the pressure difference generated before and after the fluid flows through the inner cone, and the flow rate is proportional to the square root of the corresponding differential pressure value according to the Bernoulli equation. Generally, the pressure in the low-pressure area of the sensor is introduced from a central hole in the rear end face of the inner cone, passes through a low-pressure introduction pipe (supporting pipe) and is transmitted to a low-pressure taking port to measure a pressure value, and the accuracy of the pressure value is directly related to the accuracy of a differential pressure value (namely, the accuracy of a flow value). Therefore, the central hole of the rear end face of the inner cone is always positioned at the central position of the watch body and can be ensured by adopting corresponding structural measures. The existing inner cone is fixed in a watch body and is connected and fixed on the watch body by a supporting tube (only playing the role of a low-pressure-leading tube), the defect is that the structural strength of the existing inner cone is low in a cantilever structure (namely a single-fulcrum structure), when a medium fluid flows through a throttling area formed between the inner cone and the watch body, the medium fluid causes large impact force, vibration and radial displacement to the inner cone, the former easily causes connection fracture, and the latter cannot ensure that a central hole in the rear end face of the inner cone is positioned in the center of the watch body, so that the low-pressure-taking position is changed at any time, and finally pressure taking is unstable, and the flow measurement precision is influenced.

SUMMERY OF THE UTILITY MODEL

To the defect that exists among the above-mentioned prior art, the utility model aims to solve the technical problem that a low pressure is got and is pressed stably, and structural strength is firm multiple spot supports formula V and bores flow sensor.

In order to solve the technical problem, the utility model provides a multiple spot supports formula V awl flow sensor which comprises the table body, interior cone (throttling element), the low pressure is got and is pressed mouthful, the high pressure is got and is pressed mouthful, stay tube (low pressure drawing pipe), its characterized in that still includes: the front supporting piece consists of three front ribs, one end of each front rib is fixedly arranged at the front end of the inner cone (throttling piece), the other end of each front rib is fixedly arranged at the inner side of the watch body, and the three front ribs mutually form an angle of 120 degrees; the back support piece is composed of three back ribs, one end of each back rib is fixedly arranged at the back end of the inner cone (throttling piece), the other end of each back rib is fixedly arranged at the inner side of the watch body, and the three back ribs form a 120-degree angle with each other.

Furthermore, the front rib piece and the rear rib piece are fixedly arranged at the surface body and are provided with stop blocks.

Furthermore, the front rib and the rear rib are fixedly arranged on the inner side of the watch body by screws.

Utilize the utility model provides a multiple spot supports formula V awl flow sensor, because the preceding of cone including the adoption, the rear end is fixed in the location structure of the table body by 120 muscle piece respectively with the inner cone, make inner cone and table body form a rigidity whole (and former support piece only plays the low pressure and draws the pressure effect) to guaranteed the stability and the accuracy that the low-pressure area got the pressure, in order to guarantee the sufficient intensity of inner cone connection, prolonged the life of complete machine.

Drawings

FIG. 1 is a schematic diagram of a prior art V-cone flow sensor;

fig. 2 is a schematic structural diagram of a multipoint support type V-cone flow sensor according to an embodiment of the present invention;

figure 3 is a view from direction a of the embodiment of figure 2 of the present invention;

fig. 4 is a view of the embodiment of fig. 2 in the direction B.

Detailed Description

The following description of the embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to the embodiments, and all similar structures and similar variations thereof adopted by the present invention should fall within the protection scope of the present invention.

The embodiment of the utility model provides a multiple spot supports formula V awl flow sensor, as shown in fig. 2-4, get pressure mouth 2, high pressure including table body 5, inner cone (throttling element) 4, low pressure and get pressure mouth 1, stay tube (low pressure drainage tube) 3, its characterized in that still includes: a front support member 6, which is composed of three front ribs, one end of each front rib is fixedly arranged at the front end of the inner cone (throttling element) 4, the other end of each front rib is fixedly arranged at the inner side of the watch body 5, and the three front ribs mutually form an angle of 120 degrees; the rear support member (8) is,the device consists of three rear ribs, one end of each rear rib is fixedly arranged at the rear end of an inner cone (throttling element) 4, the other end of each rear rib is fixedly arranged at the inner side of a watch body 5, and the three rear ribs mutually form an angle of 120 degrees; the front rib piece and the rear rib piece are fixedStop blocks 7 are arranged at the meter body; when fluid (measured medium) flows through a throttling annular gap surface formed by the sensor meter body 5 and the inner cone body 4 (comprising the front supporting piece 6), a low-pressure area is formed at the rear end (comprising the supporting piece 8) of the inner cone body, the pressure (low pressure) in the low-pressure area enters from the central hole and is measured as P through the low-pressure taking port 2 communicated with the supporting pipe 3 (low-pressure leading pipe) ₂ (P ₁ Pressure in high pressure zone measured for the front end of the inner cone), P ₁ And P ₂ After the pressure difference is respectively led into the differential pressure transmitter, the pressure difference at a certain flow is displayed, and the flow value corresponding to the pressure difference can be measured according to the pressure difference. The hollow arrows in the figure indicate the direction of fluid flow.

The front supporting piece 6 and the rear supporting piece 8 in the structure of the embodiment are respectively welded at the front end and the rear end of the inner cone 4, three ribs of the supporting pieces are mutually arranged at an angle of 120 degrees to form a whole, the other ends of the ribs are fastened on a stop block 7 in the meter body by screws, the whole assembly is completed, and the connection between the supporting tube 3 (the low-pressure tube) and the low-pressure taking port 2 on the meter body is still implemented according to the original process requirements.

Claims

1. The utility model provides a multiple spot supports formula V awl flow sensor, gets pressure mouth, high pressure and gets pressure mouth, stay tube including table body, inner cone, low pressure, its characterized in that still includes: the front supporting piece consists of three front ribs, one end of each front rib is fixedly arranged at the front end of the inner cone, the other end of each front rib is fixedly arranged on the inner side of the watch body, and the three front ribs form an angle of 120 degrees with each other; the back support piece consists of three back ribs, one end of each back rib is fixedly arranged at the back end of the inner cone, the other end of each back rib is fixedly arranged at the inner side of the watch body, and the three back ribs form a 120-degree angle with each other.

2. The multipoint support type V-cone flow sensor according to claim 1, wherein the front rib and the rear rib are fixedly arranged at the surface body and are provided with stop blocks.

3. The multipoint support type V-cone flow sensor according to claim 1, wherein said front rib and said rear rib are fixed to the inside of said watch body by screws.