CN101476959B - Ultra-high pressure intelligent pressure transmitter - Google Patents
Ultra-high pressure intelligent pressure transmitter Download PDFInfo
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- CN101476959B CN101476959B CN2009100369744A CN200910036974A CN101476959B CN 101476959 B CN101476959 B CN 101476959B CN 2009100369744 A CN2009100369744 A CN 2009100369744A CN 200910036974 A CN200910036974 A CN 200910036974A CN 101476959 B CN101476959 B CN 101476959B
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- 230000007704 transition Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 abstract 1
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- 238000005259 measurement Methods 0.000 description 4
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- 239000002184 metal Substances 0.000 description 2
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- 230000001351 cycling effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
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Abstract
The invention discloses an ultrahigh voltage intelligent pressure transmitter, which consists of a flat film type pressure sensitive element, a thermistance, a bridge type resistance strain gauge, an outer pipe, an HART protocol intelligent board, a sealing terminal and a cable, wherein the pressure sensitive part of the flat film type pressure sensitive element is an elastic flat film which is arranged on the bottom plane of a hollow cylindrical pressure leading hole. The measuring range of the ultrahigh voltage intelligent pressure transmitter can reach 1,000 MPa, and 1,400 MPa to the highest. Under ultrahigh voltage (1,000MPa) pressure, the intelligent pressure transmitter has strong repeated impact resistance and overvoltage impact resistance. The thermistance used for measuring the temperature of a medium is arranged on a pressure sensitive core, and can quickly and accurately sense and measure the temperature of the medium. The HART protocol intelligent board is adopted to carryout digitalized processing on data and output a standard signal. The invention provides a high performance and high reliability ultrahigh voltage intelligent pressure transmitter for occasions needing measuring the ultrahigh pressure.
Description
Technical field:
The present invention relates to a kind of transmitter of measuring fluid medium pressure, be specially adapted to pressure up to the UHV (ultra-high voltage) measurement of 1000MPa and the ultra-high pressure intelligent pressure transmitter in the middle of the opertaing device.
Background technology:
At present, in UHV (ultra-high voltage) measurement instrument field,, normally adopt the pressure-sensing device mode (as shown in Figure 2) of open circles pillar for pressure-sensing device.This element is that the presser sensor position is arranged on the hollow cylinder tracting pressuring hole cylindrical outer wall.Its principle of work is: when being used for open circles pillar pressure-sensing device inwall under the pressure effect of measured medium, hollow cylinder is because of the stressed expansion deformation that produces radially.This situation changes the resistance of the resistance strain plate that is affixed on outer wall and produces output signal, with this output signal processing and amplifying in addition, converts the output of 4～20mA standard signal to.The pressure-sensing device of this open circles pillar is just obtained pressure signal with the deformation of cylinder.Therefore, it has the following disadvantages, and the first, output signal is low, generally has only 0.5～1mV/V, and signal to noise ratio (S/N ratio) is also extremely low; The second, zero point instability, this element is easy to generate elastic fatigue under the UHV (ultra-high voltage) effect, and seriously drifted about zero point; The 3rd, serviceable life is short, occurs phenomenon of rupture easily under high pressure impacts for thousands of times, causes transmitter not work; The 4th, owing to the structural reason of open circles pillar pressure-sensing device, its test accuracy is lower than 0.2% under the high pressure.
Summary of the invention:
At above-mentioned problem, the purpose of this invention is to provide a kind of ultra-high pressure intelligent pressure transmitter of measuring range up to 1000MPa, the structure of pressure-sensing device has been carried out new design, become planar film chip pressure-sensing device.
The objective of the invention is to solve by the following technical programs: a kind of ultra-high pressure intelligent pressure transmitter of measuring range up to 1000MPa, by planar film chip pressure-sensing device, thermistor, the bridge-type strain ga(u)ge, outer tube, HART protocol-intelligent plate, hermetic terminal, cable assembly forms, it is characterized in that: the presser sensor position of described planar film chip pressure-sensing device is arranged on the elastic linear diaphragm on the base plane of hollow cylinder impulse pore, the junction that wherein is positioned at hollow cylinder impulse pore also is provided with the transition circle cambered surface that a radius is 0.40mm≤R≤0.80mm, the value of arc radius can realize accurately measuring range up to 1000MPa by being determined by the measuring pressure size by this structure.
Above-mentioned ultra-high pressure intelligent pressure transmitter, the thickness of described elastic linear diaphragm are 1.50mm≤T≤3.00mm, specifically by being determined by the measuring pressure size.
Above-mentioned ultra-high pressure intelligent pressure transmitter, the diameter of described hollow cylinder impulse pore is less than 3mm.
Above-mentioned ultra-high pressure intelligent pressure transmitter, described bridge-type strain ga(u)ge are according to the correspondence position in the tensile deformation district of the elastic linear diaphragm of planar film chip sensitive element and compression set district and custom-designed circular bridge-type strain ga(u)ge.
Above-mentioned ultra-high pressure intelligent pressure transmitter, described thermistor places on the cylindrical side outer wall of planar film chip pressure-sensing device, enable fast, accurately to respond to the temperature of measured medium, intelligent plate can carry out accurately and fast temperature, synchronous compensation thereby make.
Above-mentioned ultra-high pressure intelligent pressure transmitter, described HART protocol-intelligent plate can carry out digitized processing with the signal of strain ga(u)ge and thermistor output, and convert the output of 4～20mADC stack HART communication protocol signal to, satisfy the requirement of fieldbus in the automatic control system.
The present invention has following characteristics: pressure-sensing device adopts the version of planar film chip, and is higher, more stable to obtain, up to 2-3mv/v pressure-strain signal; The elastic linear diaphragm intersection of the tracting pressuring hole of pressure-sensing device and bottom is not the right angle, but is designed to have the transition circle cambered surface that radius is R, with anti-ability, shock-resistant ability and anti-overvoltage capabilities of tearing under the situation that improves UHV (ultra-high voltage); Described bridge-type strain ga(u)ge is at the correspondence position in the tensile deformation district of elastic linear diaphragm and compression set district and custom-designed circular bridge-type strain ga(u)ge, to obtain maximum signal and signal to noise ratio (S/N ratio).The thermistor of measuring media temperature places on the presser sensor fuse, can be fast, the accurate temperature of measurement of inductance medium.Adopt HART protocol-intelligent plate that data are carried out digitized processing, improve the various performances of pressure unit.
Description of drawings:
Fig. 1 is a general assembly structural representation of the present invention;
Fig. 2 is the open circles pillar pressure-sensing device synoptic diagram of prior art;
Fig. 3 is the synoptic diagram of planar film chip pressure-sensing device of the present invention.
Below in conjunction with accompanying drawing specific embodiments of the invention are elaborated:
As shown in Figure 1, the present invention is constituted by planar film chip pressure-sensing device 1, thermistor 2, bridge-type strain ga(u)ge 3, outer tube 4, HART protocol-intelligent plate 5, hermetic terminal 6, cable 7, hollow cylinder impulse pore (8), elastic linear diaphragm (9).
As shown in Figure 2, be prior art structure chart open circles pillar pressure-sensing device 1, strain ga(u)ge 2.
Embodiment:
As Fig. 1, shown in Figure 3, processing is key of the invention process in the design of planar film chip pressure-sensing device 1, the processing of elastic linear diaphragm 9, need to guarantee the planarity of impulse pore 8 bottom elastic linear diaphragms, need the thickness T of control elastic linear diaphragm, the value of T is by being determined by the size of measuring pressure, range is high more, T is big more, and value of the present invention is 1.50mm≤T≤3.00mm, and the error control of thickness is at 0.01mm; The depth of parallelism that needs the control plane diaphragm, permissible error is within the scope of 0.005mm; Needs guarantee that it is the transition circle cambered surface of R that the intersection of impulse pore 8 and base plane has a radius, and the size of this R is by being determined that by the measuring pressure size value of the present invention is the transition circle cambered surface of 0.4mm≤R≤0.80mm.After shaping, just can become desirable elastic linear diaphragm through bakingout process.After handling like this, can bear 1000MPa pressure cycling surge pressure number of times and reach more than 100,000 times.
The present invention utilizes the high heat-conducting glue of heat-conductive characteristic that thermistor 2 is close on the pressure-sensing device 1, and as shown in Figure 1, thermistor 2 can sense the temperature of measured medium apace like this.We adopt the thermistor of Pt1000, Pt1000 be a kind of accurately, the thermistor of sensitive, stable performance, under identical temperature, signal to noise ratio (S/N ratio) than Pt100 thermistor exceeds an order of magnitude, thereby its sensitivity is higher, guarantee the accurate collection medium temperature of ultra-high pressure intelligent pressure transmitter, and carried out the pulling temperature compensation.
Described HART protocol-intelligent plate 5 models are HK-H991M, its acp chip is H100A, H100A is an industry HART best solution now, for ultra-high pressure intelligent pressure transmitter provides flexible and powerful signal processing platform, it has following several advantage: band FLASH storer in (1) chip makes the data of being stored safer; (2) core I C adopts six Metal Packaging, shields undesired signal to greatest extent; (3) powerful data backup, restore funcitons and field data hold function; (4) have communication function, support remote configuration of main frame and adjustment; (5) accuracy height can be realized highly reliable, high stability.
Mode of connection of the present invention as shown in Figure 1, the present invention be two-wire system (4～20mADC) pressure units, cable outlet R represents to connect positive source among Fig. 1, outlet B represents pressure unit signal output plus terminal.In the range ability of ultra-high pressure intelligent pressure transmitter, with the difference of pressure, can correspondingly export 4～20mADC stack HART communication protocol signal, this signal is input to secondary control instruments such as computing machine, PLC, realize input and control.
Principle of work of the present invention is: when the pressure of measured medium acts on planar film chip pressure-sensing device 1, elastic linear diaphragm 9 stressed effects and outwards expanding, heave at the center of diaphragm, form elastic stretching deformation district, the root of diaphragm (promptly with the suitable position of impulse pore 8 pore sizes) then forms an elastic compression deformation district, be in the bridge-type strain ga(u)ge in elastic stretching district and elastic compression district, can produce output signal up to 2～3mV/V.This signal is equivalent to adopt 2～4 times of the output signals of open circles pillar pressure-sensing device gained.Thereby keep very high output signal and very high signal to noise ratio (S/N ratio).This be the pillar of open circles described in prior art pressure-sensing device the sort of structure can not reach.
In design, the junction of planar diaphragm 9 and impulse pore 8 is not the right angle, has the transition circle cambered surface that radius is R 0.5 but be designed to one.Can improve the degree of anti tear so greatly.And the number of times of the compression shock of anti-1000MPa can reach 80000～100000 times, has prolonged serviceable life greatly, has improved reliability and accuracy.
In design, the wall thickness H of the cylinder of load plane diaphragm support can be carried very highly, reducing drift and the interference that additional deformation brings, and the accuracy that has greatly improved output signal; The ratio H of wall thickness and thickness: T 〉=5: 1.The value of H can obtain very big, so the thickness T of elastic linear diaphragm 9 can obtain very big value, to adapt to higher gaging pressure.This also be open circles pillar pressure-sensing device the sort of structure can not reach.The range of UHV (ultra-high voltage) pressure unit of the present invention can reach 1000MPa, reaches as high as 1400MPa.Under this pressure, its output still can have very high accuracy, can reach more than 0.05%.
In design, bridge-type strain ga(u)ge 3 is to cooperate the size of elastic linear diaphragm 9 and custom-designed, be positioned at elastic linear diaphragm 9 above, make its bridge resistance, be in the highest zone of stress of elastic stretching deformation and elastic compression deformation respectively; Make its output signal up to 2～3mV/V, thereby improve accuracy.During up to 1000MPa, accuracy of measurement can reach 0.05% at pressure.
Thermistor is placed near the electric resistance wire strain gauge the round metal cylinder, make thermistor can sense the temperature of measuring media quickly and accurately.Adopt the intelligent plate of HART agreement that the output signal of pressure-sensing device and thermistor is carried out digitized processing, the output of one group of 4～20mADC stack HART communication protocol signal can be provided, can improve the accuracy and the reliability of pressure unit effectively, and satisfy the requirement of fieldbus in the automation control system.
Claims (5)
1. ultra-high pressure intelligent pressure transmitter of measuring range up to 1000MPa, by planar film chip pressure-sensing device (1), thermistor (2), bridge-type strain ga(u)ge (3), outer tube (4), HART protocol-intelligent plate (5), hermetic terminal (6), cable (7) combines, it is characterized in that: the presser sensor position of described planar film chip pressure-sensing device (1) is arranged on the elastic linear diaphragm (9) on the base plane of hollow cylinder impulse pore (8), the junction that wherein is positioned at this hollow cylinder impulse pore (8) also is provided with the transition circle cambered surface that a radius is 0.40mm≤R≤0.80mm, the value of arc radius can realize accurately measuring range up to 1000MPa by being determined by the measuring pressure size by this structure.
2. ultra-high pressure intelligent pressure transmitter according to claim 1 is characterized in that: the thickness of described elastic linear diaphragm (9) is 1.50mm≤T≤3.00mm, specifically by being determined by the measuring pressure size.
3. ultra-high pressure intelligent pressure transmitter according to claim 1 is characterized in that: described bridge-type strain ga(u)ge (3) is according to the correspondence position in the tensile deformation district of the elastic linear diaphragm (9) of planar film chip sensitive element (1) and compression set district and custom-designed circular bridge-type strain ga(u)ge.
4. ultra-high pressure intelligent pressure transmitter according to claim 1 is characterized in that: described thermistor (2) places on the cylindrical side outer wall of planar film chip pressure-sensing device (1).
5. ultra-high pressure intelligent pressure transmitter according to claim 1, it is characterized in that: described HART protocol-intelligent plate (5) can carry out digitized processing with the signal of bridge-type strain ga(u)ge (3) and thermistor (2) output, and convert the output of 4～20mADC stack HART communication protocol signal to, satisfy the requirement of fieldbus in the automatic control system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100369744A CN101476959B (en) | 2009-01-23 | 2009-01-23 | Ultra-high pressure intelligent pressure transmitter |
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| CN2009100369744A CN101476959B (en) | 2009-01-23 | 2009-01-23 | Ultra-high pressure intelligent pressure transmitter |
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| CN101476959A CN101476959A (en) | 2009-07-08 |
| CN101476959B true CN101476959B (en) | 2011-03-16 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929901B (en) * | 2010-08-17 | 2011-08-31 | 陈旭财 | Elastic element of pressure transmitter |
| CN103454032A (en) * | 2013-08-16 | 2013-12-18 | 中国电子科技集团公司第四十八研究所 | Pressure sensitive core with thermistor |
| CN105181188A (en) * | 2015-07-20 | 2015-12-23 | 湖南菲尔斯特传感器有限公司 | Intelligent pressure transmitter |
| US10352801B2 (en) | 2016-05-10 | 2019-07-16 | Fike Corporation | Intelligent temperature and pressure gauge assembly |
| CN107966222A (en) * | 2017-11-23 | 2018-04-27 | 蚌埠市勇创机械电子有限公司 | A kind of friction-type pressure sensor |
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Effective date of registration: 20110201 Address after: 510665, Guangzhou, Guangdong, Tianhe District province rhyme Road No. 102 division rhyme building on the third floor Applicant after: Xie Dagang Co-applicant after: Guangzhou Senex Instrument Co., Ltd. Address before: 510665, Guangzhou, Guangdong, Tianhe District province rhyme Road No. 102 division rhyme building on the third floor Applicant before: Xie Dagang |
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Effective date of registration: 20180321 Address after: 518057 Guangdong province Shenzhen City Nanshan High-tech Industrial Park, North District 3 Wan News Building Patentee after: Shenzhen Maxonic Automation Control Co., Ltd. Address before: 510665, Guangzhou, Guangdong, Tianhe District province rhyme Road No. 102 division rhyme building on the third floor Co-patentee before: Guangzhou Senex Instrument Co., Ltd. Patentee before: Xie Dagang |
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