CN2310983Y

CN2310983Y - Multifunctional integrated uniform velocity tube flowmeter

Info

Publication number: CN2310983Y
Application number: CN 96224140
Authority: CN
Inventors: 项家从
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-11-29
Filing date: 1996-11-29
Publication date: 1999-03-17
Anticipated expiration: 2006-11-29

Abstract

The utility model relates to a multifunctional integrated uniform velocity tube flowmeter which comprises a uniform velocity tube flow sensor JQC, a diffuse silicon differential pressure transmitter KBC, a diffuse silicon pressure transmitter KBY, a thermal resistance temperature sensor WZC and a protective cover FHZ. The utility model is characterized in that the transmitter KBC and DBY and the sensor JQC and WZC are fixed into integration by the connecting board of a three-valve set provided with a negative pressure valve, a positive pressure valve and a balance valve. The utility model can measure flow, temperature and pressure parameters, can reduce or eliminate the measurement error, and can conveniently and quickly complete the dredging work of a lead-out pipe in the whole pressure and the static pressure, with the advantages of compact structure small installing space and high reliability.

Description

The multifunctional all mean velocity tube flowmeter

The utility model relates in the industrial process, temperature, pressure and flow measurement device in the FLUID TRANSPORTATION, the incorporate multi-functional mean velocity tube flowmeter of particularly a kind of temperature, pressure and flow measurement.

There are general mean velocity tube flowmeter and integrated even speed tube flow transmitter in the prior art.In these two kinds of even speed tubes, more complete with integrated even speed tube flow transmitter function, but also have following problem:

1. it only has the flow measurement function in the fluid delivery process, and does not have temperature and pressure parameter measurement function.

When needs are measured the temperature and pressure of fluid; mounting temperature sensor, pressure unit and connecting pipe, valve and the transmitter guard box relevant separately with pressure survey, and must be separately respectively number establish temperature sensor and pressure unit signal cable and cable protection pipe etc.

2. it will produce measuring error at operational process

Because it is that what to increase in the even speed tube termination is two two-way valves, rather than three valve groups, in fluid delivery process, does not check the variation at zero point of differential pressure transmitter, also just can not adjust, produce the flow measurement error therefrom.

3. existing even speed tube top does not have total head delivery line and the vertical dredging hole of static pressure delivery line, and static tube is ＂ L ＂ type structure, and extremely difficult mediation causes even speed tube to be scrapped after the obstruction

The fluid of carrying in the industrial processes, major part are non-clean fluid, generally all suspending silt, dust, condensation product etc., and the obstruction of even speed tube is inevitable.

The purpose of this utility model is at existing integrated even speed tube flow transmitter above shortcomings, a kind of existing flow measurement function is provided, temperature and pressure parameter measurement function is arranged again, can reduce or eliminate measuring error, can make things convenient for and finish total head and static pressure delivery line mediation work soon, compact conformation, can reduce installing space, lift from the multifunctional all mean velocity tube flowmeter of reliability.

Above-mentioned purpose of the present utility model is to realize by such technical scheme, it is a kind of multifunctional all mean velocity tube flowmeter, comprise the even speed tube flow sensor, the diffuse si differential pressure transmitter, diffused silicon pressure transmitter, thermal resistance temperature sensor and protective cover, it is characterized in that: protect the silicon differential pressure transmitter that looses, diffused silicon pressure transmitter, thermal resistance temperature sensor is fixed as one by three valve group web joints and even speed tube flow sensor, wherein by the total head signal of even speed tube flow sensor output from the total head delivery line, positive valve on three valve group web joints, be connected to the plemum of equalizing valve one end and differential pressure transmitter respectively; Static pressure signal is from the static pressure delivery line, and the negative pressure valve on three valve group web joints is connected to the negative pressure chamber of equalizing valve one end, differential pressure transmitter and the pressure sensing element of pressure unit respectively, differential pressure transmitter and pressure unit output 4～20mA current signal; Temperature sensor passes three valve group web joints and inserts in the even speed tube, is resistance signal output with temperature inversion.

The embodiment of the indefiniteness that said structure of the present utility model can provide by accompanying drawing further specifies:

Utility model has following accompanying drawing:

Accompanying drawing 1 is a structural representation of the present utility model;

Accompanying drawing 2 is the cut-away view of even speed tube flow sensor;

Accompanying drawing 3 is the left view of Fig. 2;

Accompanying drawing 4 is the utility model pressure signal processing flow chart;

Accompanying drawing 5 is the utility model fundamental diagram.

Referring to Fig. 1: the utility model is made of even speed tube flow sensor JQC, three valve group web joint SZB, diffuse si differential pressure transmitter KBC, diffused silicon pressure transmitter KBY, thermal resistance temperature sensor WZC and protective cover FHZ etc.

Referring to Fig. 2, Fig. 3: the utility model even speed tube sensor is made of total head delivery line CYG, static pressure delivery line JYG, even speed tube JSG and three valve group web joint SZB etc.In the present embodiment, the static pressure delivery line is a straight tube structure, has the vertical dredging hole STK with the static pressure delivery line of total head delivery line in the SZB upper surface.

Referring to Fig. 4: the utility model pressure signal flow process is: the total head signal is from total head delivery line CYG, and the positive valve ZYF on three valve group web joints is respectively to the end of equalizing valve PHF and the plemum of differential pressure transmitter KBC; Static pressure signal is from static pressure delivery line JYG, and the FYF on SZB is respectively to the negative pressure chamber of PHF one end, KBC and the pressure sensing element of pressure unit KBY.Wherein, equalizing valve PHF plays ＂ zeroing effect to differential pressure transmitter, to reduce or eliminate measuring error.

Principle of work of the present utility model is such:

Referring to accompanying drawing 6, after JQC is installed to the detected fluid conveyance conduit, when fluid flows through JQC, produce square differential pressure signal that is directly proportional with the flow size, enter KBC through SZB, in KBC, differential pressure signal is transformed to the 4～20mA current signal corresponding with it and exports; By fluid pressure signal, from JQC static pressure delivery line, enter KBY through SZB, in KBY, pressure signal is transformed to the 4～20mA current signal corresponding with it and exports; The temperature of detected fluid by the WZC sensing that inserts among the JQC, is converted to the resistance signal output corresponding with it.

The said structure that the utility model is used has following features:

1. multi-functional

Can measure simultaneously the parameters such as temperature, pressure and flow of detected fluid, and be converted to corresponding electricity Stream or resistance signal output.

2. one body

It integrates even speed tube flow sensor, differential pressure transmitter, pressure unit, temperature sensor and three valve groups etc.The dispersant system of the identical function that it and conventional instrument constitute relatively has following advantage:

2.1 save connecting pipe, valve, secondary valve, blowoff valve, three valve groups and a transmitter guard box etc.Amount to and economize 9 on valve, 1 of three valve group, 2 of guard boxs and connecting pipe and each tens of rice of cable protection pipe.

2.2 economize mounting material, man-hour and expense more than 80%.

2.3 economize service material, man-hour and expense about 90%.

2.4 investment-saving: it and the systematic comparison of 50～2500mm pore plate flow measurement, investment-saving 20～500%.

2.5 high reliability, high operation ratio, less trouble.

3. volume is little

The installing space that takies only is about 10% of conventional system

4. in light weight

Weight power is about 20% of conventional instrument system.

Claims

1. multifunctional all mean velocity tube flowmeter, comprise even speed tube flow sensor JQC, diffuse si differential pressure transmitter KBC, diffused silicon pressure transmitter KBY, thermal resistance temperature sensor WZQ and protective cover FHZ, it is characterized in that: diffuse si differential pressure transmitter KBC, diffused silicon pressure transmitter KBY, thermal resistance temperature sensor WZC is fixed as one by three valve group web joint SZB and even speed tube flow sensor JQC, wherein by the total head signal of even speed tube output from total head delivery line CYG, positive valve ZYF on three valve group webs, respectively to the plemum of equalizing valve PHF one end and differential pressure variator KBC; Static pressure signal is from static pressure delivery line JYG, and the negative pressure valve FYF on SZB is connected to the negative pressure chamber of the PHF other end, KBC and the pressure sensing element of pressure unit KBY respectively, KBC and KBY output 4～20mA current signal; Temperature sensor WZC passes three valve group web joints and inserts JQC, is resistance signal output with temperature exchange.

2. require 1 described multifunctional all even speed tube quantifier according to the power thorn, it is characterized in that: the static pressure delivery line JYG in the even speed tube flow sensor JQC is the straight pipe type structure; Has vertical dredging hole STK with total head delivery line and static pressure delivery line UNICOM with the fixing three valve group web joint SZB upper surfaces of JQC.