CN208026421U - Circular iris resistance-strain type pressure, differential pressure pickup - Google Patents

Circular iris resistance-strain type pressure, differential pressure pickup Download PDF

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Publication number
CN208026421U
CN208026421U CN201820234523.6U CN201820234523U CN208026421U CN 208026421 U CN208026421 U CN 208026421U CN 201820234523 U CN201820234523 U CN 201820234523U CN 208026421 U CN208026421 U CN 208026421U
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Prior art keywords
pressure
convex
spill
sensitive
sensitive diaphragm
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严登丰
胡为东
杜伟伟
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Jiangsu Zhongliu Guoliang Technology Co.,Ltd.
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Yangzhou Jiangtian Traffic Instrument Co Ltd
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Abstract

Circular iris resistance-strain type pressure, differential pressure pickup, belong to non-electrical quantity measurement technology field.The sensor of the utility model can be used for measuring the relative pressure and pressure difference of fluid using round sensitive diaphragm;Band new interface has standard signal output;It coordinates with display system, can be assembled into novel pressure instrument, pressure difference instrument, vacuum-pressure instrument, pressure-pressure difference instrument, water-level gauge, current meter, flowmeter etc.;Coordinate with computer, pressure can be completed(Liquid level), pressure difference, flow velocity, flow etc. automatic detection.

Description

Circular iris resistance-strain type pressure, differential pressure pickup
Technical field
The utility model is related to a kind of circular iris resistance-strain type pressure, differential pressure pickups, belong to non-electrical quantity measurement technology Field.The utility model can be used for hydraulic and hydroelectric engineering, cities and towns and industrial and mineral supply and discharge Hydraulic Projects and petroleum chemical engineering, measure river The pressure (liquid level) or pressure difference of the fluids such as road, pipeline, reservoir, oil (gas) tank, it can also be used to measure fluid flow rate, flow.
Background technology
There are many sensor for measuring Fluid pressure (pressure difference), according to different operating principle, there is piezoelectric type, pressure resistance type, capacitance Formula, resistance-strain type etc..With the development of material science and electronic information, automatic technology, conventional piezoresistance sensor is universal Using highly sensitive diffusion silicon sensor, capacitance type sensor is also more passed using ceramic condenser small, with high accuracy Sensor.
Resistance strain type sensor is the resistance sensor that conversion element is calculated as with resistance-strain, resistance-strain type sensing Device is made of elastic sensing element, strain ga(u)ge and box body.Compared with other sensors, resistance strain type sensor application It is early, technology maturation.The outstanding advantages of resistance strain type sensor also reside in:Precision is high, wide range of measurement, long lifespan, and frequency response is special Property it is good, it is easy to accomplish miniaturization, integration and diversification of varieties etc..
Finding strain electric pressure (pressure difference) sensor patent has:1. filed in 26 days October in 1991 of Jiangsu Agricultural College 《Novel pressure (poor) sensor and its interface》(Patent No. 91227117.5), the sensor are the resistance-strains of typical pattern Sensor, two bellowss are as force transfer element, the non-circular diaphragm of elastic sensing element but board-like work beam, sensor installation Complexity, volume are larger.
2. filed in 3 days December in 1998 of Zhang Jinchi《Low Fluid pressure is changed into the elastic element of strain》(patent Number for 98249117.4).The sensor application circular film, Fluid pressure load directly act on diaphragm.But it is used Diaphragm is not elastic sensing element, is intended only as force transfer element, and elastic sensing element is " integrated strain to be made with circular iris Beam ".
3. filed in 17 days Mays in 2003 of Nagano Meter Co., Ltd.《Absolute pressure type pressure sensor》(the patent No. For 03145462.3).This sensor elastic sensing element uses circular film, diaphragm directly to bear fluid load.But because It is only used for measuring absolute pressure, and the one side of reference pressure is born in circular iris and must make enclosed construction, is Absolute truth in interior It is empty.
4. filed in 25 days December in 2001 of Suopu Measurement and Control Technology Co., Ltd, Changsha, Hunan《For periphery fixed circle The thin film strain resistor of flat diaphragm steel loop》(Patent No. 01257599.2).The patent reflects " periphery fixed circle flat membrane The achievement in research of piece ", but this is the achievement of strain gauge, is not the achievement of sensor.
Utility model content
The purpose of this utility model is a kind of circular iris resistance-strain type pressure of proposition in view of the above shortcomings of the prior art Power, differential pressure pickup, the sensor are novel combination type resistance strain sensor, simple in structure, install convenient.
The technical solution of the utility model is as follows:Circular iris resistance-strain type pressure, differential pressure pickup, including sensor box Body, characterized in that the sensor cartridge includes the spill part with cavity and convex pressure part with cavity, described convex The protrusion of pressure part is connected to the recessed portion of spill part, constitutes sensor cartridge, the both ends of the sensor cartridge are set respectively There are high pressure pressure port, low pressure pressure port;Round sensitive diaphragm, the sensitive membrane are equipped between the spill part, convex pressure part Piece is pasted with foil strain gauge on one side, and the sensitive diaphragm is perpendicular to spill part, the axis of convex pressure part.
Further, the convex pressure part, sensitive diaphragm are two, and the spill part is one, and the high pressure takes Pressure hole, low pressure pressure port are respectively placed at two convex pressure parts;Annular convex platform is equipped in the middle part of the cavity of the spill part, it is described Convex pressure part is inserted into from the both ends of spill member cavity in spill member cavity respectively, and is respectively placed in the both ends of annular convex platform Face;Two sensitive diaphragms are respectively placed between two convex pressure part and annular convex platform, and the opposite face difference of two sensitive diaphragms Bonded foiled gage.
Further, it is clamped with force-transmitting pole between two sensitive diaphragms, which is placed in the endoporus of annular convex platform, and Two foil strain gauges are connected in series with.
Further, the both ends of the surface of the annular convex platform are being respectively equipped with sealing rubber ring with two sensitive diaphragm contact positions Ⅰ;Two sensitive diaphragms are equipped with the one side of foil strain gauge and enclose composition cavity respectively with the endoporus of annular convex platform, the cavity cavity wall It is respectively equipped with fairlead I.
Further, the sensitive diaphragm, convex pressure part, spill part are one, and the high pressure pressure port, low pressure take Pressure hole is respectively placed in convex pressure part, at spill part;The convex pressure part, spill part junction are equipped with support accessory A, the branch It is hollow-core construction to hold part A, and the sensitive diaphragm is placed between support accessory A and convex pressure part.The cavity of support accessory A with it is recessed The low pressure pressure port unicom of shape part, sensitive diaphragm post the one of foil strain gauge facing towards low pressure pressure port.
Further, the both ends of the surface of the support accessory A are being respectively equipped with sealing with convex pressure part, spill part junction Rubber ring II, the sensitive diaphragm two sides dip-coating fluid sealant.The sensitive diaphragm is equipped with the one side and spill of foil strain gauge Composition cavity is enclosed between part, which is equipped with fairlead II, and the support accessory A is set with II corresponding position of fairlead There is through-hole I.
Further, the sensitive diaphragm, convex pressure part, spill part are one, and the high pressure pressure port, low pressure take Pressure hole is respectively placed in convex pressure part, at spill part, the convex pressure part, spill part junction set there are two hollow-core construction Support accessory B;One of support accessory B with convex pressure feature contacts at be equipped with power transmission elastic piece, another support accessory B exists With power transmission elastic piece also is provided at spill feature contacts;The sensitive diaphragm is placed between two support accessories, and sensitive diaphragm It is clamped with power transmission pearl respectively between two power transmission elastic pieces.The cavity of two support accessory B respectively with high pressure pressure port, low pressure Pressure port unicom, sensitive diaphragm post the one of foil strain gauge facing towards low pressure pressure port.
Further, it is equipped with annular slab in the middle part of the cavity of each support accessory B, the power transmission pearl is placed in the endoporus of annular slab Place, the end face of two support accessory B are respectively equipped with sealing rubber ring III with convex pressure part, spill part junction.The sensitivity Diaphragm, which is equipped between the one side of foil strain gauge and spill part, encloses composition cavity, which is equipped with fairlead III, branch It holds part B and is being equipped with through-hole II with III corresponding position of fairlead.
Further, the diameter of the sensitive diaphragmCircumferential direction forms clamped, effective diameter D=22mm, quick Sense diaphragm is made of beryllium-bronze or phosphor bronze, modulus of direct elasticityPoisson's coefficient μ=0.3.
Further, to improve linear sensor, load factor Q should be controlled in a certain range:
Q=p (R/h)4/E≤3.5 (1)
P is load (Pa) in formula, and R is sensitive diaphragm radius (mm), and h is sensitive diaphragm thickness (mm);
The sensitive diaphragm thickness h:
h≥R/[(3.5E/p)1/4] (2);
The sensitive diaphragm radial direction and tangential strain value:
εr=3p (1- μ2)(R2-3r2)/(8Eh2) (3)
εt=3p (1- μ2)(R2-r2)/(8Eh2) (4);
The sensitive diaphragm is radially and tangential maximum strain value is equal:
εrmaxtmax=3p (1- μ2)R2/(8Eh2) (5)。
There are four types of schemes altogether for the pressure of the utility model, differential pressure pickup:
1. as shown in Figure 1, using two round and elastic sensitive diaphragms, two strain gauges are pasted, one is born high pressure Pm, one It is a to bear low pressure Pn.Cavity between two diaphragms does not contact detected fluid, is conducive to protection foil strain gauge.This sensor is real Border is two independent pressure sensors, and the effect of this sensor is:Relative pressure can be measured, pressure difference can also be measured. If low-pressure side leads to air, high-pressure side connects detected fluid, and measured result is the relative pressure of detected fluid.When for measuring pressure difference, High pressure pressure port, low pressure pressure port lead to high pressure and low pressure detected fluid, and pressure difference is the difference of high pressure and low pressure, Δ P=Pm-Pn, can It is acquired by interface circuit, can also be handled and be realized by instrumented data.
2. as shown in Fig. 2-1, using two sensitive diaphragms, paste two strain gauges, one is born high pressure, one bear it is low Pressure.This sensor is characterized in that:There are force-transmitting pole, elastic sensitive diaphragm to bear the even cloth lotus of fluid on one side between two sensitive diaphragms It carries, pastes the load for bearing force-transmitting pole on one side of strain gauge, be conducive to improve sensitivity.As shown in Fig. 2-2,2-3, two strains The positive series wiring of meter or differential concatenation wiring.The difference of the program and one of scheme is:In mechanical structure, scheme one is two A independent sensor, elastic sensitive diaphragm respectively have individual output without contact, strain gauge;2 two sensitive diaphragm cooperations of scheme Work, two strain gauge electric bridge series connection, though respectively there is individual power supply, only there are one output, the sensitive diaphragm for bearing high pressure is logical Force-transmitting pole is crossed by pressure transmission to bearing at the sensitive diaphragm of low pressure, final detected value is the reading synthesis of two strain gauges.
Two sensor practical application of scheme is mainly that pressure difference measures, and bears the sensitive diaphragm of high pressure and bears low pressure Sensitive diaphragm leads to high-pressure fluid and low-pressure fluid respectively by convex pressure part, as water gage and other special case applicable cases.It is low Side is pressed to lead to air, high-pressure side connects detected fluid, and measured result is the relative pressure of detected fluid.
3. as shown in Fig. 3-1,3-2, using a sensitive diaphragm, a strain gauge is pasted, sensitive diaphragm is without strain gauge High pressure is born on one side, and have strain gauge bears low pressure on one side.This sensor can measure relative pressure, can also measure pressure difference. As water gage and other special case applicable cases, low-pressure side leads to air, and high-pressure side connects detected fluid, and measured result is detected fluid Relative pressure.If high and low pressure side connects high and low pressure detected fluid respectively, then measured result is pressure difference.This sensor is used for liquid Body pressure difference measures occasion, sensitive diaphragm two sides dip-coating fluid sealant, to meet two sides contact liq requirement.
4. as shown in Fig. 4-1,4-2, using a diaphragm, a strain gauge is pasted, sensitive diaphragm bears high pressure on one side, separately Low pressure is born on one side.This sensor is characterized in that different from scheme three:It installs respectively at sensor high and low pressure pressure port position Two thin power transmission elastic pieces, and respectively by two power transmission pearls in a manner of concentrated force, Fluid pressure is reached in sensitive diaphragm Heart point.When in use, low-pressure side leads to air to this sensor, and high-pressure side connects detected fluid, and measured result is the phase of detected fluid To pressure.If high and low pressure side connects high-low pressure detected fluid respectively, then measured result is pressure difference.This sensor is different from scheme One, it two, three is further characterized in that:No matter being used for any operating mode, the two sides of elastic sensitive diaphragm, strain gauge do not contact measured stream Body.
Further include electric part as sensor.The utility model pressure (pressure difference) sensor electric part includes strain Electric bridge and interface circuit are counted, sensor interface circuitry has ripe technology.But to take into account explosion-proof equal requirement, supply voltage It is restricted, resistance-strain pressure (pressure difference) sensor output signal is weaker, and exclusive PCR ensures to export the emphasis that stabilization is design. In recent years the NSA (C) 2860 to appear on the market is the integrated industrial sensor conditioning pick-up chip of first domestic high-precision, can successfully be applied In various resistives or capacitance type sensor.NSA2860 is integrated with external JFET controllers, 24 main signal Measurement channels, sensing Device calibration logic, the circuits such as two-way constant-current source, and digital interface can be supported to export, analog voltage exports, and 4~20mA pick-ups are defeated Go out, the various patterns such as PWM/PDM outputs.NSA2860 only needs minimum external devices, you can realizes the calibration of pressure transmission module And pick-up.The zero to sensor, the second-order temperature drift calibration of sensitivity and three are supported by built-in MCU, NSA2860 Rank gamma correction, calibration accuracy can reach within 0.1%, and calibration factor is stored in one group of EEPROM.This practicality is new The newest ideal interface circuit chips NSA286 advanced using function, small, cheap of type pressure (pressure difference) sensor.
About the interface circuit of sensor, because of the new product that chip NSA286 systems appear on the market in recent years, above 4 electrostrictive strain pressure measurement Application of power (pressure difference) the sensor national patent without this advanced chip.
The patent document being previously mentioned in background technology 1., compared with the utility model, because there is two bellowss as power transmission Element, the non-circular sensitive diaphragm of elastic sensing element but board-like work beam, sensor installation is complicated, and volume is larger, and structure It is different.2. used diaphragm is not elastic sensing element to patent document, is intended only as force transfer element, elastic sensing element be with " integrated strain beam is made " in circular iris, also differs widely with the structure of the utility model.The sensitive member of the elasticity of patent document 3. Part uses circular film, diaphragm directly to bear fluid load;But because it is only used for measuring absolute pressure, and low-pressure side is closed, Interior middle absolute vacuum is different from the utility model structure;The sensor structure of the utility model can also be surveyed for measuring pressure difference Determine relative pressure, low-pressure side is not closed, and detected fluid or logical air are in direct contact.4. patent document reflects that " periphery is solid The achievement in research of branch circle flat diaphragm ", but this is the achievement of strain gauge, is not the achievement of sensor, and the utility model is application Pressure (pressure difference) sensor of " periphery fixed circle flat diaphragm ", is the application of strain gauge.
The sensor of the utility model can be used for measuring the relative pressure and pressure difference of fluid;Band new interface (i.e. NSA2860 Chip), there is standard signal output;It coordinates with display system, can be assembled into novel pressure instrument, pressure difference instrument, vacuum-pressure Instrument, pressure-pressure difference instrument, water-level gauge, current meter, flowmeter etc.;Coordinate with computer, pressure (liquid level), pressure difference, stream can be completed The automatic detection of speed, flow etc..
Description of the drawings
Fig. 1 be the utility model one in circular iris resistance-strain type pressure, differential pressure pickup structural schematic diagram;
Fig. 2-1 be the utility model two in circular iris resistance-strain type pressure, differential pressure pickup structural schematic diagram;
Fig. 2-2 is foil strain gauge forward direction series connection schematic diagram in the utility model two;
Fig. 2-3 is foil strain gauge differential concatenation schematic diagram in the utility model two;
Fig. 3-1 be the utility model three in circular iris resistance-strain type pressure, differential pressure pickup structural schematic diagram;
Fig. 3-2 is the assembling schematic diagram of Fig. 3-1;
Fig. 4-1 be the utility model four in circular iris resistance-strain type pressure, differential pressure pickup structural schematic diagram;
Fig. 4-2 is the assembling schematic diagram of Fig. 4-1;
In figure:1 spill part, 2-1 support accessory A, 2-2 support accessories B, 3 convex pressure parts, 4 round sensitive diaphragms, 5 foils Formula strain gauge, 6-1 sealing rubber rings I, 6-2 sealing rubber rings II, 6-3 sealing rubber rings III, 7-1 fairleads I, 7-2 fairleads II, 7-3 fairleads III, 8 high pressure pressure ports, 9 low pressure pressure ports, 10 power transmission elastic pieces, 11 power transmission pearls, 12 force-transmitting poles, 13 annulars Boss, 14-1 through-holes I, 14-2 through-holes II, 15 annular mounting plates.
Specific implementation mode
1. embodiment one
As shown in Figure 1, sensor structure includes:Spill part 1, convex pressure part 3, I 6-1 of sealing rubber ring, elasticity are sensitive Diaphragm 4, foil strain gauge 5, I 7-1 of fairlead, high pressure pressure port 8, low pressure pressure port 9.Box body is the branch of elastic sensitive diaphragm 4 Part is held, convex pressure part 3 protrudes into part 1 with thread connection, compresses elastic sensitive diaphragm 4, foil strain is pasted on flexible sheet It counts and fills sealing rubber ring I between 5, with box body, leaded hole I on box body, convex 3 threaded pressure tapping connector 8 of pressure part, 9 (i.e. high pressures Pressure port, low pressure pressure port).When working sensor, two diaphragms are respectively subjected to detected fluid pressure PmAnd Pn
Sensor production includes:
1. flexible sheet makes:1) metallic elastic piece is processed:By selected material and work load such as p (Pa), press more than Design and calculation method determines load factor Q, foil gauge thickness h;2) suitable strain gauge is chosen, foil strain gauge is selected;3) it answers Become meter to paste, cure:Strain gauge stickup and solidification are completed by strain gauge technology for applying;4) strain gauge is connected into bridge and protection:Bridge Arm resistance is connected into after electric bridge so that after the shampooing of acetone cotton balls, dilute gel coating is protected.
2. box body is processed:1) nonferrous materials (brass, stainless steel or alloy aluminum) is selected;2) it is machined.
3. interface circuit design, modulation.
4. installing:Installation contact surface, thread contact face are shampooed with acetone, and sealing rubber ring applies fluid sealant (silica gel).
Explanation:Box body spill part 1, box body protrude into part 3 in addition to using non-ferrous metal mechanical processing, and PSA also can be used Or SPA3D printings;Support accessory 2 preferably uses SPA material 3D printings.
2. embodiment two
As shown in Fig. 2-1,2-2,2-3, sensor structure includes:Spill part 1, convex pressure part 2, sealing rubber ring 6-1, Elasticity, sensitive diaphragm 4, foil strain gauge 5, fairlead 7-1, force-transmitting pole 12, pressure port 8 and 9.It is with one difference of embodiment: The strain gauge electric bridge of two flexible sheets is connected into combined type electric bridge, has force-transmitting pole 7 between two flexible sheets.Remaining same embodiment One.
Sensor production, installation basic demand are the same as embodiment one.Pay attention to checking force-transmitting pole flexibility and length ruler in installation Very little, force-transmitting pole is slightly longer than the clear distance of two circular iris in assembly, it is ensured that load transmits continuous.
3. embodiment three
As shown in Fig. 3-1,3-2, sensor structure includes:Spill part 1, support accessory 2, convex pressure part 3, sensitive diaphragm 4, foil strain gauge 5, " O " shape sealing rubber ring 6-2, fairlead 7-2, high pressure pressure port 8, low pressure pressure port 9.This sensor With embodiment one, two the difference is that:Only there are one sensitive diaphragms.The convex pressure part 3 of box body is packed into recessed with threaded connection mode Shape part 1 has fill " O " shape rubber ring 6-2 in the two sides groove of support accessory A 2-1, support accessory A therebetween.
When working sensor, pressure port 8 leads to high pressure.When measuring pressure and liquid level, 9 one end of pressure port leads to air;When pressure measurement difference, Pressure port 9 one terminates low pressure.This sensor diaphragm two sides can all contact detected fluid, need dip-coating waterproof insulation glue.
Sensor production, installation basic demand are the same as embodiment one.Box body spill part 1, box body, which protrude into part 3 and remove to use, to be had Non-ferrous metal mechanical processing is outer, and PSA or SPA3D printings also can be used;Support accessory 2 preferably uses SPA material 3D printings.
4. example IV
As shown in Fig. 4-1,4-2, sensor structure includes:Spill part 1, support accessory 2, box body protrude into part 3, sensitivity Diaphragm 4, foil strain gauge 5, " O " shape sealing rubber ring 6-3, fairlead 7-3, high pressure pressure port 8, low pressure pressure port 9, power transmission bullet Property piece 10, power transmission pearl 11.This sensor is different from embodiment three, separately there is the thin slice of two contact detected fluids outside sensitive diaphragm (power transmission elastic piece) 10 has power transmission ball 11 between thin slice and elastic sensitive diaphragm.Therefore, sensitive no matter being used for which kind of occasion The two sides of diaphragm does not contact detected fluid.
When installation, box body protrudes into part 3 and is packed into spill part 1 with threaded connection mode, and there are two support accessory B therebetween 2-2, sensitive diaphragm 4 are clipped between two support accessories, and " O " shape rubber ring 6-3 is filled in groove.
When working sensor, pressure port 8 leads to high pressure.When measuring pressure and liquid level, 9 one end of pressure port leads to air;When pressure measurement difference, Pressure port 9 one terminates low pressure.
Sensor production, installation basic demand are the same as embodiment one.Box body spill part 1, box body, which protrude into part 3 and remove to use, to be had Non-ferrous metal mechanical processing is outer, and PSA or SPA3D printings also can be used;Support accessory 2 preferably uses SPA material 3D printings.
Power transmission pearl, which is strict with, uses standard product.Pay attention to checking power transmission pearl flexibility, power transmission pearl in assembly in installation Diameter is slightly larger than the clear distance of circular iris and elastic sheet, it is ensured that load transmits continuous.
This sensor elasticity sensitive diaphragm forms two cavitys with power transmission thin slice, due to sensitive diaphragm and two bearings zero Without seal approach between part B, so the endless totally-enclosed of the two cavitys, is not present pressure difference, therefore act on the lotus of sensing element It carries in addition to power transmission pearl load, without other unbalanced loads.
By the mechanical characteristic of the clamped diaphragm of surrounding, evenly load p and concentrated force F (=0.25 π R2P) center maximum becomes Shape is respectively:
w0=wmax=3p (1- μ2)R4/(16Eh3) (6)
wmax=3F (1- μ2)·4R2/(4Eπ·4h3) (7)。
It follows that under corresponding loading condition, the anamorphic effect of concentrated force expands 4 times than even cloth load.That is, only Want thin slice selection appropriate, it is unlikely to reduce transducer sensitivity because increasing steel tape.

Claims (8)

1. a kind of circular iris resistance-strain type pressure, differential pressure pickup, including sensor cartridge, characterized in that the sensor Box body includes the spill part with cavity(1)And the convex pressure part with cavity(3), the protrusion company of the convex pressure part It is connected to the recessed portion of spill part, constitutes sensor cartridge, the both ends of the sensor cartridge are respectively equipped with high pressure pressure port(8), Low pressure pressure port(9);Round sensitive diaphragm is equipped between the spill part, convex pressure part(4), the one side of the sensitive diaphragm It is pasted with foil strain gauge(5), the sensitive diaphragm is perpendicular to spill part, the axis of convex pressure part.
2. circular iris resistance-strain type pressure according to claim 1, differential pressure pickup, characterized in that the convex pressure zero Part, sensitive diaphragm are two, and the spill part is one, and the high pressure pressure port, low pressure pressure port are respectively placed in two At convex pressure part;Annular convex platform is equipped in the middle part of the cavity of the spill part(13), the convex pressure part is respectively from spill part The both ends of cavity are inserted into spill member cavity, and are respectively placed in the both ends of the surface of annular convex platform;Two sensitive diaphragms are respectively placed in Between two convex pressure part and annular convex platform, and the opposite face of two sensitive diaphragms distinguishes bonded foiled gage.
3. circular iris resistance-strain type pressure according to claim 2, differential pressure pickup, characterized in that two sensitive membranes Force-transmitting pole is clamped between piece(12), which is placed in the endoporus of annular convex platform, and two foil strain gauges are connected in series with.
4. circular iris resistance-strain type pressure according to claim 2 or 3, differential pressure pickup, characterized in that the annular The both ends of the surface of boss are being respectively equipped with sealing rubber ring I with two sensitive diaphragm contact positions(6-1).
5. circular iris resistance-strain type pressure according to claim 1, differential pressure pickup, characterized in that the sensitive membrane Piece, convex pressure part, spill part are one, and the high pressure pressure port, low pressure pressure port are respectively placed in convex pressure part, spill zero At part;The convex pressure part, spill part junction are equipped with support accessory A(2-1), support accessory A is hollow-core construction, described Sensitive diaphragm is placed between support accessory A and convex pressure part.
6. circular iris resistance-strain type pressure according to claim 5, differential pressure pickup, characterized in that the bearing zero The both ends of the surface of part A are being respectively equipped with sealing rubber ring II with convex pressure part, spill part junction(6-2), the sensitive diaphragm Two sides dip-coating fluid sealant.
7. circular iris resistance-strain type pressure according to claim 1, differential pressure pickup, characterized in that the sensitive membrane Piece, convex pressure part, spill part are one, and the high pressure pressure port, low pressure pressure port are respectively placed in convex pressure part, spill zero At part, the convex pressure part, spill part junction set the support accessory B there are two hollow-core construction(2-2);One of bearing Part B with convex pressure feature contacts at be equipped with power transmission elastic piece(10), another support accessory B with spill feature contacts at Equipped with power transmission elastic piece(10);The sensitive diaphragm is placed between two support accessories, and sensitive diaphragm and two power transmission elasticity Power transmission pearl is clamped between piece respectively(11).
8. circular iris resistance-strain type pressure according to claim 7, differential pressure pickup, characterized in that each support zero Annular slab is equipped in the middle part of the cavity of part B(15), the power transmission pearl is placed at the endoporus of annular slab, the end face of two support accessory B It is respectively equipped with sealing rubber ring III with convex pressure part, spill part junction(6-3).
CN201820234523.6U 2018-02-09 2018-02-09 Circular iris resistance-strain type pressure, differential pressure pickup Active CN208026421U (en)

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Address after: 225000 second floor, entrepreneurship service center, University Science Park, No. 217, Kaifa West Road, Yangzhou high tech Industrial Development Zone, Jiangsu Province

Patentee after: Jiangsu Zhongliu Guoliang Technology Co.,Ltd.

Address before: 225000 second floor, entrepreneurship service center, University Science Park, No. 217, Kaifa West Road, Yangzhou high tech Industrial Development Zone, Jiangsu Province

Patentee before: YANGZHOU JIANGTIAN FLOW INSTRUMENT CO.,LTD.