CN208621237U - A kind of floating cell suitable for differential pressure transmitter - Google Patents
A kind of floating cell suitable for differential pressure transmitter Download PDFInfo
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- CN208621237U CN208621237U CN201821023179.2U CN201821023179U CN208621237U CN 208621237 U CN208621237 U CN 208621237U CN 201821023179 U CN201821023179 U CN 201821023179U CN 208621237 U CN208621237 U CN 208621237U
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- differential pressure
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- pressure transmitter
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- floating cell
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Abstract
The utility model relates to differential pressure transmitter technical fields, specifically disclose a kind of floating cell suitable for differential pressure transmitter, wherein, it include: sensor element, cup body component and body part, cup body component and body part weld, cup body component includes cup body, cup body and sensor element weld, the annular compartment along sensor element periphery is formed on cup body component, body part includes isolation diaphragm and ontology, the welding of the outer surface of isolation diaphragm and ontology, and two symmetrical chambers are formed behind the positive pressure side end face and the welding of suction side end face of isolation diaphragm and ontology, there are two symmetrical deflector holes for setting on ontology, one end of each deflector hole is connect with the annular compartment, the other end is connect with chamber, chamber, filling liquid is respectively provided in annular compartment and deflector hole.Floating cell provided by the utility model suitable for differential pressure transmitter can be suitable for differential pressure transmitter.
Description
Technical field
The utility model relates to differential pressure transmitter technical field more particularly to a kind of floatings suitable for differential pressure transmitter
Bellows.
Background technique
Capacitance differential pressure cell has been widely used in various industrial circles, but to the existing skill of the precise measurement of differential pressure
There are no reliable schemes for art.As shown in Figure 1, being existing floating cell structure, differential pressure transmitter is by detection part and conversion
Part forms, and detection part includes sensor element 20, cup body component 30, body part 40, cup body 31, isolation diaphragm 41, fills out
The compositions such as filling liquid 11, ontology 42, protection diaphragm 44, the combination of each metal parts use all-welded integral structure, as
For the medium of pressure conduction filled with filling liquid in bellows, filling liquid forms symmetrical 3 chambers full of bellows two sides.
Under normal running conditions, tested differential pressure P1, P2 acts on the isolation diaphragm 41 of 40 positive and negative pressure two sides of body part
On, and sensor element 20 and protection diaphragm 44 are passed to through deflector hole 43 by filling liquid 11 simultaneously.In sensor element 20
Measuring diaphragm 21 by differential pressure Δ P=P1-P2(P1 > P2) effect is lower generates micro-displacement, this micro-displacement is convertible into the electricity of ratio
Hold signal output, realize the measurement to differential pressure, protection diaphragm 44 at this time remains static and will not act.
Under abnormal operating conditions, as encountered unidirectional excessive pressure stress when maloperation, 40 positive and negative pressure two sides of body part
Effect (unidirectional excessive pressure much larger than measurement range that differential pressure transmitter allow) of any side by unidirectional excessive pressure, is at this moment protected
Cuticula piece 44 starts movement and generates flexible deformation, protrudes outward deformation after 41 stress of other side isolation diaphragm, at this time another side chamber
The filling liquid of room 3 is partially moved to another side cavity 1.With the raising of ambient pressure, the filling liquid 11 in compression side cavity 1 is complete
Portion is transferred in compression side cavity 3, and compression-side isolation diaphragm 41 fits like a glove with compression-side ontology 42, at this point, due to compression-side
Without filling liquid in chamber 1, extraneous excessive pressure will not be transmitted to again in body part 40.Survey is significantly reduced in this way
The practical compression for measuring diaphragm 21 avoids measuring diaphragm 21 from damaging because being acted on by excessive pressure, plays unidirectional excessive pressure protection
Effect.Isolation diaphragm 41 and protection diaphragm 44 when transmitter is restored to normal running conditions, as elastic material production
It is restored to normal condition.The differential pressure transmitter of this structure has apparent advantage when for compared with wide-measuring range.
But the differential pressure transmitter complex structural designs of this floating cell structure, manufacture difficulty is big, is especially used for elementary errors
When pressure transmitter, because measurement range is small (0.1 ~ 1kPa), the subtle variation of any one in manufacturing process and interference all can be right
Properties of product generate apparent adverse effect, and this variation and interference are uncontrollable in the fabrication process.These shadows
The factor of sound causes product temperature characteristic poor, and repeatability, stability are bad, and static pressure, unidirectional static pressure dispersion degree are high, long-time stability
Deterioration, directly influences the normal work of product.
Therefore, how to provide a kind of floating cell structure suitable for differential pressure transmitter becomes those skilled in the art urgently
Technical problem to be solved.
Summary of the invention
The utility model aims to solve at least one of the technical problems existing in the prior art, provides a kind of suitable for elementary errors
The floating cell of pressure transmitter, to solve the problems of the prior art.
As the one aspect of the utility model, a kind of floating cell suitable for differential pressure transmitter is provided, wherein institute
Stating suitable for the floating cell of differential pressure transmitter includes: sensor element, cup body component and body part, the cup body component
It is welded with the body part, the cup body component includes cup body, and the cup body and the sensor element weld, in the cup
The annular compartment along sensor element periphery is formed on body component, the body part includes isolation diaphragm and ontology, it is described every
It is welded from the outer surface of diaphragm and the ontology, and the positive pressure side end face and negative pressure side of the isolation diaphragm and the ontology
Two symmetrical chambers are formed after the welding of face, symmetrical deflector hole there are two settings on the ontology, each deflector hole
One end is connect with the annular compartment, and the other end is connect with the chamber, in the chamber, annular compartment and the deflector hole
Filling liquid is set.
Preferably, the positive pressure side end face and negative pressure side end face of the ontology are corrugated surface, the isolation diaphragm and two
The symmetrical two chambers that the corrugated surface is formed are ripple chamber.
Preferably, the liquid measure of two indoor filling liquids of chamber is equal.
Preferably, the isolation diaphragm includes metal foil diaphragm.
Preferably, the making material of the cup body and the ontology includes stainless steel material.
Preferably, the filling liquid includes silicone oil or fluorocarbon oil.
Floating cell provided by the utility model suitable for differential pressure transmitter, eliminates protection compared with prior art
Diaphragm reduces the filling liquid measure in bellows, guarantees the symmetrical structure of manufacture course of products, and it is bad and defeated to eliminate generation performance
Unstable key factor out, so that the main performances such as the temperature of product, static pressure, unidirectional static pressure, response time, long-time stability
Index is able to guarantee and be promoted, and eliminates loss from spoilage, and quality is reliably guaranteed, the product manufacturing of high accuracy becomes can
Can, therefore, the floating cell provided by the utility model suitable for differential pressure transmitter can be suitable for differential pressure transmitter.
Detailed description of the invention
Attached drawing is to be used to provide a further understanding of the present invention, and constitute part of specification, and following
Specific embodiment be used to explain the utility model together, but do not constitute limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the section structure of the floating cell of the prior art.
Fig. 2 is the schematic diagram of the section structure of the floating cell provided by the utility model suitable for differential pressure transmitter.
Fig. 3 is the temperature characterisitic trial curve figure of the utility model.
Fig. 4 is the temperature characterisitic trial curve figure of the prior art.
Fig. 5 a is the unidirectional Static compression performance test result figure of the utility model.
Fig. 5 b is the Static compression performance test result figure of the utility model.
Fig. 5 c is the unidirectional Static compression performance test result figure of the prior art.
Fig. 5 d is the Static compression performance test result figure of the prior art.
Fig. 6 is that the unidirectional of the utility model excessive crushes bad trial curve figure.
Fig. 7 is the long-term stable experiment curve graph of the utility model.
Specific embodiment
Specific embodiment of the present utility model is described in detail below in conjunction with attached drawing.It should be understood that herein
Described specific embodiment is only used for describing and explaining the present invention, and is not intended to limit the utility model.
As the one aspect of the utility model, a kind of floating cell suitable for differential pressure transmitter is provided, wherein such as
Shown in Fig. 2, the floating cell 10 suitable for differential pressure transmitter includes: sensor element 20, cup body component 30 and ontology
Component 40, the cup body component 30 are welded with the body part 40, and the cup body component 30 includes cup body 31, the cup body 31
It is welded with the sensor element 20, forms the annular compartment 2 along 20 periphery of sensor element, institute on the cup body component 30
Stating body part 40 includes isolation diaphragm 41 and ontology 42, and the outer surface of the isolation diaphragm 41 and the ontology 42 is welded, and
Two symmetrical chambers are formed behind the isolation diaphragm 41 and the positive pressure side end face of the ontology 42 and the welding of suction side end face
1, there are two symmetrical deflector hole 43, one end of each deflector hole 43 and the annular compartments 2 for setting on the ontology 42
Connection, the other end are connect with the chamber 1, are respectively provided with filling liquid 11 in the chamber 1, annular compartment 2 and the deflector hole 43.
Floating cell provided by the utility model suitable for differential pressure transmitter, eliminates protection compared with prior art
Diaphragm reduces the filling liquid measure in bellows, guarantees the symmetrical structure of manufacture course of products, and it is bad and defeated to eliminate generation performance
Unstable key factor out, so that the main performances such as the temperature of product, static pressure, unidirectional static pressure, response time, long-time stability
Index is able to guarantee and be promoted, and eliminates loss from spoilage, and quality is reliably guaranteed, the product manufacturing of high accuracy becomes can
Can, therefore, the floating cell provided by the utility model suitable for differential pressure transmitter can be suitable for differential pressure transmitter.
As shown in Fig. 2, being suitable for the floating cell 10 of differential pressure transmitter by sensor element 20, cup body component 30, sheet
Body component 40 is welded to form integral structure.Cup body component 30 is combined by cup body 31 with the welding of sensor element 20, in inner cup portion
The chamber 2 along 20 periphery of sensor element is formed on part 30.Cup body component 30 is combined into body part 40 by welding applicable
In the floating cell 10 of differential pressure transmitter.Isolation diaphragm 41 is combined with ontology 42 using welding manner along circumferential periphery, is combined
It is directly formed on the corrugated surface of ontology 42 using press machine afterwards, two ripples have between completely the same identical property and two ripples
Chamber 1 is formed, body part 40 is constituted.The corrugated surface there are two symmetrical deflector hole 43 and Bilateral Symmetry is processed on ontology 42.
Filling liquid 11 is full of chamber 1, annular compartment 2 and the deflector hole 43 in floating cell 10, chamber 1, annular compartment 2 and deflector hole 43
The structure for being suitable for the floating cell 10 of differential pressure transmitter is constituted relative to sensor element 20.
Specifically, the positive pressure side end face and negative pressure side end face of the ontology 42 are corrugated surface, the isolation diaphragm 41 with
The symmetrical two chambers 1 that two corrugated surfaces are formed are ripple chamber.
Preferably, the liquid measure of the filling liquid 11 in two chambers 1 is equal.Preferably, the filling liquid 11 is wrapped
Include silicone oil or fluorocarbon oil.
Specifically, the corrugated design of the positive and negative pressure side end face of body part 40 is full symmetric structure, is held in manufacturing process
Easily guarantee that its consistency, the filling liquid 11 in floating cell 10 are respectively filled with all spaces of positive and negative pressure side and guarantee that liquid measure is equal
Deng.
Preferably, the isolation diaphragm 41 includes metal foil diaphragm.
Preferably, the making material of the cup body 31 and the ontology 42 includes stainless steel material.
Specifically, isolation diaphragm 41 is metal foil diaphragm, is usually made by SUS316L stainless steel strip, but not limited to this
Material can also be the metal materials such as Hastelloy, Meng Naier, tantalum.Cup body 31 and ontology 42 are using the state with particular/special requirement
The processing of productionization SUS316 stainless steel bar.Filling liquid 11 can be silicone oil or fluorocarbon oil.
When normal operating conditions, tested differential pressure P1, P2 act on the isolation diaphragm 41 of 40 positive and negative pressure two sides of body part
Outer surface, and be directly delivered to cup body component 30 by filling liquid 11 through deflector hole 43 and be divided into two-way, sensing is acted on all the way
On the measuring diaphragm 21 of device component 20, a routing annular compartment 2 acts on the annular peripheral of sensor element 20.
Measuring diaphragm 21 is by differential pressure Δ P=P1-P2(P1 > P2) effect when generate micro-displacement, this micro-displacement is convertible
Proportional capacitance signal output, realizes the precise measurement to small differential pressure.
Floating cell provided by the utility model suitable for differential pressure transmitter removes floating compared with prior art
Diaphragm fundamentally solves and deforms the various influence factors of generation because floating diaphragm fails.When larger change occurs for environment temperature
When change, with raising and reducing for temperature, a variety of materials constituted suitable for the floating cell 10 of differential pressure transmitter all can
Generate thermal expansion and contraction.Sensor element 20 and measuring diaphragm 21 are made by silicon materials, thermal expansion coefficient very little, environment
The variation of temperature influences it almost to can be ignored.Cup body 31 and ontology 42 are welded as a whole, but because two kinds of parts use
Same metal material production, thermal expansion coefficient having the same and similar geometry, welded stress will not make material
Generate mutation.
Furthermore the liquid measure of the filling liquid 11 in body part 40 is reduced, being affected by temperature maximum is filling liquid 11, liquid
There is biggish thermal expansion coefficient relative to metal, when transducer design manufactures, it is desirable to the filling liquid measure in bellows is as few as possible,
The chamber that the utility model structure eliminates protection diaphragm above-mentioned and is consequently formed, so that the filling liquid 11 in body part 40
Liquid measure reduce 50% compared with the structure of the prior art, effectively reduce the temperature influence factor as caused by 11 liquid measure of filling liquid.
Optimize 11 liquid measure technological parameter of filling liquid, 40 liang of side cavities of body part are improved by the method for Optimizing Process Parameters
Original process L ± 20ml is optimized for L ± 10ml by the consistency of 1 liquid measure.Meanwhile the heat de-airing temperature by improving filling liquid 11
Degree and the mode for extending degassing time reduce the minimum gas in filling liquid 11.
In addition, the floating cell provided by the utility model suitable for differential pressure transmitter can realize structure design and production
Symmetry, after removing floating diaphragm, ontology be a part can readily guarantee body part processing and manufacturing symmetry.
Also, since cup body 31, ontology 42 are made of the production domesticization SUS316 stainless steel bar of particular/special requirement, material
Particularity be the stringent limitation to H content, the micro H in material can be escaped and with gaseous state under the conditions of long term high temperature
H2It is mixed into filling liquid 11, generation expansion is affected by temperature and causes output wild effect.The utility model is by controlling material certainly
The H content of body guarantees H2Escaped quantity it is insignificant.
By above-mentioned measure, the temperature characterisitic of differential pressure transmitter is significantly improved, when the temperature increases, is suitable for micro-
The thermal stress that the expansion of filling liquid 11 in the floating cell 10 of differential pressure transmitter generates acts on inner cavity, the portion that allowance for expansion increases
It point is all limited in the chamber 1 of the positive and negative two sides of body part 40, to accommodate the volume increased, isolation diaphragm 41 can be at this time
Outer prominent deformation, because isolation diaphragm 41 is made by metallic resilient material and for corrugated, have wider displacement range and
Plastic deformation will not be generated, therefore, measuring diaphragm 21 will not be had an impact.Conversely, when the temperature decreases, filling liquid 11 is received
It contracts, the volume in chamber 1 reduces, the inside contraction distortion of isolation diaphragm 41, equally certifiable positive and negative two side cavity of body part 40
The equalization of filling liquid 11 in 1.Furthermore because of structure design, the full symmetric property of manufacture and the equalization of positive and negative pressure two sides filling liquid 11
Property, it can cancel out each other thermal stress of the partial action to the positive and negative two sides of measuring diaphragm 21.
Floating cell provided by the utility model suitable for differential pressure transmitter improves Static compression performance, specifically, fits
When floating cell 10 for differential pressure transmitter is acted on by high static pressure, due to the structure of the annular compartment 2 of cup body component 30,
Improve the stress of sensor element 20, sensor element 20 not only by the effect of axial force, while along outer ring by
The stepless action of radial force plays sensor element 20 and measuring diaphragm 21 so that sensor element 20 is in quick condition
Reliable protective effect.
It when abnormal operating state, such as has been more than the measurement range allowed by measuring pressure, because of cup unidirectionally by excessive pressure
The self-shield of 20 structural design of annular compartment 2 and sensor element of body component 30 acts on, and can be relieved measuring diaphragm 21
Stress.It is verified by destructive testing: at 1.0MPa unidirectionally excessive pressure effect, measuring diaphragm 21 will not be damaged, in 0.5MPa
Under unidirectional excessive pressure effect, unidirectional excessive pressure characteristic is within the limits prescribed.Under real working condition, the unidirectional excessive pressure of 0.5MPa
Site technology requirement can be met.
As shown in figure 3, being the utility model temperature characterisitic trial curve figure, abscissa is humid test range in figure: -40
DEG C ~ 85 DEG C, ordinate is temperature augmenting factor, is the humid test error specification value allowed in the heavy line of two intersections.It is right
The measured curve of 18 products of the utility model is that 0 line or more is distributed in humid test curve set shown in fine line, by it is high,
The influence very little of low temperature variation, illustrates humid test characteristic good.
It is the temperature characterisitic trial curve figure of the prior art under above-mentioned equivalent assay conditions shown in Fig. 4.Take 24 products
Measured curve be shown in fine line, humid test curve discrete degree is big, is unevenly distributed, and far from above and below 0 line, half is super
Cross specification value.Influenced by high and low temperature change very big, especially 0 DEG C of low-temperature characteristics below is worse, illustrates humid test spy
Property is poor.
It is illustrated in figure 5 static pressure, unidirectional Static compression performance test evaluation control test result figure, it can be seen that Fig. 5 a, figure
5b is respectively the unidirectional static pressure of the utility model, Static compression performance test result, and quantity 20, test value integrated distribution is on a 0 line left side
The right side, dispersion degree very little, for performance indicator much higher than specification value requirement, characterisation is excellent.Fig. 5 c, Fig. 5 d are respectively the prior art
Unidirectional static pressure, Static compression performance test result, quantity 28, test Distribution value far from 0 line, dispersion degree is very big, more performances
Index is close to specification value, and individually beyond specification value requirement, characterisation is bad.
Be illustrated in figure 6 the utility model it is unidirectional it is excessive crush bad trial curve figure, choose 4 products and pressed with 0.4MPa
Power is starting point, presses the multiple of 0.2MPa thereafter, is successively respectively applied to positive and negative pressure side, and it is 2.0MPa that maximum, which applies pressure, is surveyed
The variable quantity of offset output is tried, and determining with this allows maximum to apply stressed limiting value.Test result: in 2.0MPa pressure
When, 1 product measuring diaphragm perforation destroys, and in 1.0MPa pressure, 4 product measuring diaphragms do not have damage inactivation,
0.5MPa is unidirectionally under excessive pressure effect, and unidirectional excessive pressure characteristic is within the limits prescribed.
It is illustrated in figure 7 the long-term stable experiment curve graph of the utility model, production domesticization material production is chosen in test
Ontology and cup body part carry out, experimental condition are as follows: 60 DEG C of test temperature, last 90 days.Experiment quantity: 64.Test result:
Offset output variable quantity stablizes the very a small range above and below 0 line, and the utility model product of production domesticization material production is steady for a long time
Qualitative test meets technical requirements, function admirable.
In conclusion the floating cell provided by the utility model suitable for differential pressure transmitter has compared with prior art
It has the advantage that
, bellows structure design it is simple, reduce manufacture difficulty and cost.
, eliminate protection diaphragm, guarantee the symmetrical structure of manufacture course of products, eliminate generate performance it is bad and output not
Stable key factor, so that the main performance index such as the temperature of product, static pressure, unidirectional static pressure, response time, long-time stability
It is able to guarantee and be promoted, eliminate loss from spoilage, quality is reliably guaranteed, the product manufacturing of high accuracy is possibly realized.
, the filling liquid in bellows it is less, be conducive to the improvement of temperature characterisitic, the raising of long-time stability, reliability.
, filling liquid liquid measure under optimization isolation diaphragm, guarantee that filling liquid measure is impartial in bellows member.
, using special stainless steel material processing and fabricating ontology, the cup body part of production domesticization, ensure that long-time stability and can
It is biggish to reduce manufacturing cost by property.
, solve differential pressure measurement technical problem, provide it is a kind of measurement it is accurate, reliable and stable, cost is relatively low, performance
Excellent differential pressure transmitter.
It is understood that embodiment of above is merely to illustrate that the principles of the present invention and uses exemplary
Embodiment, however the utility model is not limited thereto.For those skilled in the art, this is not being departed from
In the case where the spirit and essence of utility model, various changes and modifications can be made therein, these variations and modifications are also considered as this reality
With novel protection scope.
Claims (6)
1. a kind of floating cell suitable for differential pressure transmitter, which is characterized in that described suitable for the floating of differential pressure transmitter
Dynamic bellows (10) include: sensor element (20), cup body component (30) and body part (40), the cup body component (30) and institute
Body part (40) welding is stated, the cup body component (30) includes cup body (31), the cup body (31) and the sensor element
(20) it welds, forms the annular compartment (2) along sensor element (20) periphery, the body part on the cup body component (30)
Part (40) includes isolation diaphragm (41) and ontology (42), and the isolation diaphragm (41) and the outer surface of the ontology (42) are welded,
And two are formed symmetrically behind the positive pressure side end face and the welding of suction side end face of the isolation diaphragm (41) and the ontology (42)
Chamber (1), on the ontology (42) setting there are two symmetrical deflector hole (43), one end of each deflector hole (43) with
Annular compartment (2) connection, the other end are connect with the chamber (1), the chamber (1), annular compartment (2) and the water conservancy diversion
Filling liquid (11) are respectively provided in hole (43).
2. the floating cell according to claim 1 suitable for differential pressure transmitter, which is characterized in that the ontology (42)
Positive pressure side end face and negative pressure side end face be corrugated surface, the isolation diaphragm (41) forms symmetrical with two corrugated surfaces
Two chambers (1) be ripple chamber.
3. the floating cell according to claim 2 suitable for differential pressure transmitter, which is characterized in that two chambers
(1) liquid measure of the filling liquid (11) in is equal.
4. the floating cell according to claim 1 suitable for differential pressure transmitter, which is characterized in that the isolation diaphragm
It (41) include metal foil diaphragm.
5. the floating cell according to claim 1 suitable for differential pressure transmitter, which is characterized in that the cup body (31)
Making material with the ontology (42) includes stainless steel material.
6. the floating cell according to claim 1 suitable for differential pressure transmitter, which is characterized in that the filling liquid
It (11) include silicone oil or fluorocarbon oil.
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| CN201821023179.2U CN208621237U (en) | 2018-06-29 | 2018-06-29 | A kind of floating cell suitable for differential pressure transmitter |
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| CN201821023179.2U CN208621237U (en) | 2018-06-29 | 2018-06-29 | A kind of floating cell suitable for differential pressure transmitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507715A (en) * | 2018-06-29 | 2018-09-07 | 无锡昆仑富士仪表有限公司 | A kind of floating cell suitable for differential pressure transmitter |
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2018
- 2018-06-29 CN CN201821023179.2U patent/CN208621237U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507715A (en) * | 2018-06-29 | 2018-09-07 | 无锡昆仑富士仪表有限公司 | A kind of floating cell suitable for differential pressure transmitter |
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