CN201373787Y - Ultrahigh pressure intelligent pressure transmitter - Google Patents
Ultrahigh pressure intelligent pressure transmitter Download PDFInfo
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- CN201373787Y CN201373787Y CN200920050767U CN200920050767U CN201373787Y CN 201373787 Y CN201373787 Y CN 201373787Y CN 200920050767 U CN200920050767 U CN 200920050767U CN 200920050767 U CN200920050767 U CN 200920050767U CN 201373787 Y CN201373787 Y CN 201373787Y
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- pressure
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- sensing device
- pressure transmitter
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Abstract
The utility model discloses an ultrahigh pressure intelligent pressure transmitter which comprises a planar membrane type pressure sensitive element, a thermistor, a bridge type electric resistance strain gauge, an outer tube, an HART protocol intelligent board, a sealing terminal and a cable, wherein the pressure sensitive position of the planar membrane type pressure sensitive element is an elastic planer membrane arranged on the bottom plane of a hollow cylindrical pressure guiding hole. The measuring range of the ultrahigh pressure intelligent pressure transmitter can reach 1,000 to 1,400 MPa to the maximum. Under an ultrahigh pressure (1,000 MPa), the pressure transmitter has strong multiple shock and overpressure shock resistance. The thermistor for measuring the medium temperature is positioned on a pressure sensitive core and can be used for quickly and accurately sense and measure the medium temperature. The HART protocol intelligent board is adopted to perform digital processing to the data and output standard signals, and the ultrahigh pressure intelligent pressure transmitter with high performance and high reliability is provided for situations requiring ultrahigh pressure measurement.
Description
Technical field:
The utility model relates to a kind of transmitter of measuring fluid medium pressure, is 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 utility model has provided a kind of novel ultra-high pressure intelligent pressure transmitter, and the structure of pressure-sensing device has been carried out new design, becomes planar film chip pressure-sensing device.
The purpose of this utility model is to solve by the following technical programs:
A kind of ultra-high pressure intelligent pressure transmitter, formed by planar film chip pressure-sensing device, thermistor, bridge-type strain ga(u)ge, outer tube, HART protocol-intelligent plate, hermetic terminal, cable assembly, 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 tracting pressuring hole.
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 presser sensor position of described planar film chip pressure-sensing device and the junction of hollow cylinder tracting pressuring hole are that radius is the transition circle cambered surface of 0.4mm≤R≤0.80mm, and the value of arc radius is by being determined by the measuring pressure size.
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 utility model 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 utility model;
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 utility model.
Below in conjunction with accompanying drawing specific embodiment of the utility model is elaborated:
Embodiment:
As shown in Figure 1, the utility model 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.
As shown in Figure 2, be prior art structural drawing open circles pillar pressure-sensing device 1, strain ga(u)ge 2.
As shown in Figure 3, be the key that the utility model is implemented in the Design and Machining of planar film chip pressure-sensing device, the processing of elastic linear diaphragm needs to guarantee the planarity of tracting pressuring hole bottom elastic linear diaphragm; Need the thickness T of control elastic linear diaphragm, the value of T is by being determined that by the size of measuring pressure range is high more, and T is big more, and the utility model value 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 tracting pressuring hole and base plane has a radius, and the size of this R is by being determined that by the measuring pressure size the utility model value 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 utility model utilizes the high heat-conducting glue of heat-conductive characteristic that thermistor 2 is close on the pressure-sensing device 1, and 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.
The model of described HART protocol-intelligent plate 5 is 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 as shown in Figure 1, the utility model 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 utility model is: when the pressure of measured medium acts on planar film chip pressure-sensing device, the effect of elastic linear diaphragm applied force and outwards expanding, heave at the center of diaphragm, form elastic stretching deformation district, the root of diaphragm (promptly with sizable position, impulse aperture) 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 open circles pillar pressure-sensing device the sort of structure can not reach.
In design, the junction of planar diaphragm and tracting pressuring hole is not the right angle, has the transition circle cambered surface that radius is R 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 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 described in the utility model 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, the bridge-type strain ga(u)ge is to cooperate the size of elastic linear diaphragm and custom-designed, makes 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 (6)
1, a kind of ultra-high pressure intelligent pressure transmitter, combined 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), 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 on the base plane of hollow cylinder tracting pressuring hole.
2, ultra-high pressure intelligent pressure transmitter according to claim 1 is characterized in that: the thickness of described elastic linear diaphragm 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, it is characterized in that: the presser sensor position of described planar film chip pressure-sensing device (1) and the junction of hollow cylinder tracting pressuring hole are that radius is the transition circle cambered surface of 0.4mm≤R≤0.80mm, and the value of arc radius is by being determined by the measuring pressure size.
4, 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 of planar film chip sensitive element and compression set district and custom-designed circular bridge-type strain ga(u)ge.
5, 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.
6, 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 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920050767U CN201373787Y (en) | 2009-01-23 | 2009-01-23 | Ultrahigh pressure intelligent pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920050767U CN201373787Y (en) | 2009-01-23 | 2009-01-23 | Ultrahigh pressure intelligent pressure transmitter |
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| Publication Number | Publication Date |
|---|---|
| CN201373787Y true CN201373787Y (en) | 2009-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920050767U Expired - Fee Related CN201373787Y (en) | 2009-01-23 | 2009-01-23 | Ultrahigh pressure intelligent pressure transmitter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024304A (en) * | 2017-03-31 | 2017-08-08 | 西安交通大学 | A kind of hyperpressure sensor of stress decay structure |
| US10352801B2 (en) | 2016-05-10 | 2019-07-16 | Fike Corporation | Intelligent temperature and pressure gauge assembly |
-
2009
- 2009-01-23 CN CN200920050767U patent/CN201373787Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10352801B2 (en) | 2016-05-10 | 2019-07-16 | Fike Corporation | Intelligent temperature and pressure gauge assembly |
| CN107024304A (en) * | 2017-03-31 | 2017-08-08 | 西安交通大学 | A kind of hyperpressure sensor of stress decay structure |
| CN107024304B (en) * | 2017-03-31 | 2019-05-07 | 西安交通大学 | A kind of hyperpressure sensor of stress decay structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091230 Termination date: 20120123 |