CN87208989U - Diaphragm-type pressure sensing device for movable medium at high temperature and pressure - Google Patents
Diaphragm-type pressure sensing device for movable medium at high temperature and pressure Download PDFInfo
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- CN87208989U CN87208989U CN 87208989 CN87208989U CN87208989U CN 87208989 U CN87208989 U CN 87208989U CN 87208989 CN87208989 CN 87208989 CN 87208989 U CN87208989 U CN 87208989U CN 87208989 U CN87208989 U CN 87208989U
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- pressure
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- cavity
- pressure detecting
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Abstract
The utility model relates to a diaphragm-type pressure sensor for a medium at high temperature and pressure, comprising a pressure detecting seat. A concave cavity, a metal diaphragm sheet, and a metal capillary tube are arranged on the end surface of the pressure detecting seat, form an integrated pressure detecting component through welding, and are connected by a capillary tube and a pressure signal transformation device. The diaphragm-type pressure sensor for the medium at high temperature and pressure is characterized in that the metal diaphragm sheet is provided with a structural shape which is similar to the concave cavity on the end surface of the pressure detecting seat. The utility model has the advantages of long service life, and furthermore, the method of carrying out welding between the capillary tube and the pressure detecting seat is also advanced. The diaphragm-type pressure sensor for the medium at high temperature and pressure is characterized in that the capillary tube is cooled by a freezing gas in the process of welding, which makes the capillary tube easily welded.
Description
The utility model relates to pressure transducer, relates in particular to diaphragm type High Temperature High Pressure flow media pressure transducer.
Because the pressure signal conversion equipment of diaphragm type pressure medium sensor is away from pressure detecting part, thereby the temperature of the instrument coefficient that wafts is little, so this pressure transducer is used widely on chemical process manufacturing equipments such as synthon, plastics, rubber, oil.But also there are the following problems for traditional diaphragm type pressure medium sensor, promptly its serviceable life not long, even have, or during use, its measuring accuracy descends less than 1 year.Produce the reason of these problems, mainly on the structure and its manufacture method of pressure detecting part, existing pressure detecting part has one and detects pedestal, and the one end has a cylinder dish shape cavity, and described barrier film, be that the elastic metallic diaphragm covers this cavity by welded seal, metal capillary passes and detects pedestal and cavity connection, and fixing by welding, in be full of measurement liquid, described pressure detecting part links with the pressure signal conversion equipment mutually by kapillary.Described diaphragm is made tabular usually substantially.Owing to detect the Outside Dimensions of formation cavity one end of pedestal certain limitation is arranged, described diaphragm and the welding that detects between the pedestal generally will be carried out on the periphery that detects pedestal, and it is narrower usually to detect pedestal and the contacted annular end face of diaphragm, therefore can not on this annular end face, form bigger fillet, like this when working sensor, diaphragm is being concentrated with annular end face engagement edge place generation fatigue stress easily, and then generation plastic yield or slight crack, in addition because described welding, fine weldering welding is adopted in the welding that comprises kapillary and detect between the pedestal usually, its weld strength is not high, sensor can not be beneficial under high-temperature and high-pressure conditions works, all crackle occurs in the commissure easily and cause that measuring liquid sews, thereby cause the measuring accuracy of instrument to descend or the reduction in serviceable life.
Therefore the utility model is exactly the diaphragm pressure sensor that proposes a kind of pressure detecting part architecture advances at the problems referred to above, and the welding method that also proposes a kind of metal capillary and hardware simultaneously, be used for carrying out the manufacturing of the pressure detecting part of described sensor, can reach the fatigue stress that alleviates or relax diaphragm and concentrate and improve described weld strength, thereby improve the purpose of pressure transducer mission life.
The utility model diaphragm pressure sensor comprises pressure detecting part and pressure signal conversion equipment, pressure detecting part comprises diaphragm mode pressure detecting assembly, this assembly comprises the detection pedestal of metal, elastic metallic diaphragm and metal capillary, the pressure signal conversion equipment that is connected with pressure detecting part by this metal capillary.
On the upper surface of described detection pedestal, form a dish-shaped cavity, this cavity has cylindrical skirt, described metallic membrane has the similar dish-shaped shape of cavity shapes therewith, but the degree of depth of its dish-shaped shape is significantly less than the degree of depth of corresponding cavity, in addition, diaphragm also has the cylindrical skirt identical with cavity, and make diaphragm and cavity chimeric mutually at its periphery and vicinity thereof respectively, and, detecting the chamber that forms airtight receiving liquid medium on the pedestal end face in the welding of carrying out on the end face of this detection pedestal between diaphragm and detection pedestal.
In addition, metal capillary passes detection pedestal and the connection of described chamber from detecting the pedestal bottom, and carries out kapillary and the welding that detects pedestal on the upper surface of detecting pedestal.
The welding method that utilization the utility model proposes is carried out the welding of described metal capillary and the welding of metallic membrane.
Described welding method principal feature is to utilize and is subjected to a certain degree freezing argon gas an end capillaceous that welds from need is passed through, and discharge from its other end, to reach cooling kapillary when welding, do not make its rapid fusing and cause the technology trouble, rotate argon arc welding machine with non consumable arc welding electrode, when making the fusing of hardware parent reach molten condition with electric arc, appropriate section capillaceous is progressively melted and and the hardware parent be melt into one, thereby kapillary firmly is welded on the metal detection body, in addition, in welding process, need carry out cleaning to the welding position of each soldering part.
Find out thus, adopt the diaphragm pressure sensor of the structure and the welding method of pressure detecting assembly of the present utility model, since cavity on the detection pedestal of pressure detecting assembly and metallic membrane can be respectively its peripheral part and near match, can form bigger fillet at the bottom margin of described cavity, can reduce or relax diaphragm fatigue stress herein concentrates, in addition owing to the welding of diaphragm can be carried out on the end face that detects pedestal, because the version that diaphragm and detection pedestal match at described position respectively, can alleviate the stressed of weld seam, in addition owing to take the hydrogen arc welding method of parent autogenous welding, the fine relatively weldering weld strength of weld strength is significantly improved, therefore shows that through on-the-spot investigation the mission life of pressure transducer of the present utility model is significantly improved.
Below in conjunction with embodiment with reference to accompanying drawing the utility model pressure sensor structure and manufacture method thereof are further elaborated.
Fig. 1 is the general structure arrangement plan that schematically illustrates the utility model pressure medium sensor-embodiment.
Fig. 2 is the approximate route map that schematically illustrates the electric signal signal transmitter in the pressure signal conversion equipment of sensor shown in Figure 1.
Fig. 3 schematically illustrates the structural drawing of multilayer brick pattern shell of the pressure signal conversion equipment of present embodiment.
Fig. 4 is the structure diagram that schematically illustrates the pressure detecting assembly of traditional pressure medium sensor.
Fig. 5 schematically illustrates the structural drawing of the utility model embodiment pressure detecting assembly.
Fig. 6 schematically illustrates the structural drawing of the another embodiment of pressure detecting assembly structure shown in Figure 5.
Fig. 7 schematically illustrates the kapillary of Fig. 5 and structure shown in Figure 6 and detects the figure of the welding method between pedestal.
Now referring to Fig. 1 and Fig. 3, by detecting pedestal 1, the diaphragm mode pressure detecting assembly that diaphragm 3 and kapillary 4 constitute, the web member 2 that has connecting thread by an end can be fixed on the tested equipment detecting pedestal 1 sealing, and pressure detecting assembly is connected to brick pattern housing 18 by flexible pipe and web member 5, on 19 (Fig. 3), and pressure detecting assembly and pressure signal conversion equipment generation signal are linked by kapillary 4.Part among Fig. 1 in the circle on the left side is represented the mechanical pointer display part of pressure signal conversion equipment and the signal input part of electric signal signal transmitter, 9 is the pressure signal web member, one end and kapillary 4 form and are welded to connect, one end of its other end and flexible member 10 forms a fixed connection, the special-shaped copper pipe that elastic sensing element 10 is sealed for 10-1 at one end, one end 10-1 of conversion element 11 and elastic sensing element 10 is fixedlyed connected, the signal input part 14-1 of one end and pointer display device 14 is fixedlyed connected, the signal input part FERRITE CORE of its other end and electric signal signal transmitter and pickup coil 12,13 signal input part is fixedly connected, at described cavity, be full of mercury or instrument oil in kapillary 4 and the elastic sensing element 10, like this, when tested pressure signal reaches flexible member 10 by the liquid medium in the above-mentioned closed system, and the mechanical effect by conversion element 11, make pointer display device and electrical signal conversion device obtain to reflect the input signal of identical tested force value simultaneously.
Referring to Fig. 2, the electric signal signal transmitter of this pressure signal conversion equipment comprises a change-over circuit, mainly possesses voltage-stabilized power supply circuit, high-frequency oscillating circuits and operational amplification circuit, voltage-stabilized power supply circuit provides constant current source to described oscillatory circuit and operational amplification circuit, tested pressure signal converts the displacement input quantity to by conversion element 11, through vibration change-over circuit and operational amplification circuit, with be connected in series a pull-up resistor by output at described change-over circuit, can obtain and the corresponding dc signal output of tested force value at the change-over circuit output terminal, as in described change-over circuit, obtaining the 0-5 volt respectively through suitable element adjustment slightly, the 1-5 volt, 4-20 milliampere, the dc signal output of 0-10 milliampere, be used for connecting use with current all kinds of secondary instruments, this part content is known for the sector technician.
Referring to Fig. 3, the housing of pressure signal conversion equipment of the present utility model is multilayer brick pattern structure, present embodiment is made of two-layer cylindrical housings, upper strata housing 18 is used for installing mechanical dial indicator display device, it is common core of pressure meter, and elastic sensing element 10, conversion element 11, FERRITE CORE and pickup coil 12,13, with web member 9, bottom 19 is used for installing the conversion circuit device of electric signal signal transmitter, on, lower floor is by the phase embedding, and be combined into one with mechanical fastener, be select to use flexibly as required for the ease of the user, the user can select simultaneously the sensor with mechanical indicator display device and electric signal signal transmitter for use, or selects the not sensor of band signal signal transmitter for use.
Referring to Fig. 4, the detection seat of the pressure detecting assembly of traditional pressure transducer and diaphragm 3 ' unitized construction as shown in the drawing, owing on detection seat upper surface, form usually and hold the chamber of measuring liquid, therefore the planar annular that stays on its end face is narrower, therefore on the edge of this planar annular, can not form bigger fillet, and diaphragm 3 ' and detect being welded in the case between pedestal and will on the periphery that detects pedestal, carry out usually, therefore not only there is diaphragm 3 ' be easy to generate the problem that fatigue stress is concentrated near cavity edge, and the stress condition that makes described weld seam becomes more abominable, brings adverse effect for the mission life of pressure transducer.
Referring to Fig. 5, diaphragm 3 has and detects similarly dish structure of the dish-shaped cavity shapes of seat on 1 upper surface, and the part 3-2 with columniform peripheral part 3-1 and extension thereof coincide with the appropriate section of described cavity respectively, therefore the described appropriate section on the cavity bottom surface of detecting seat 1 can form bigger fillet, make diaphragm 3 obtain relaxing with the concentrated problem of fatigue stress that detects the generation of seat 1 cavity bottom margin touching position, this external cause in the case, diaphragm 3 and the welding that detects between the seat 1 will be carried out on the end face that detects seat 1, because the effect of the structural rigidity factor of the peripheral part 3-1 of diaphragm 3 and 3-2, can improve the stress condition of described edge weld.In addition, kapillary 4 passes and detects seat 1, forms welding with detection seat 1 and fixedly connected on the bottom surface of its described dish-shaped cavity.
Fig. 6 is the structure of another embodiment of diaphragm 3, and among the figure, other situation is as in the situation described in Fig. 5, and just the bottom of diaphragm 3 has the corrugated planform of multiple tracks, is used for making sensor to adapt to and works under higher pressure.
In addition, present embodiment diaphragm 3 is to adopt to contain chromium, nickel, molybdenum, titanium stainless steel, is processed into by cold stamping, and the dish-shaped cavity on the detection seat 1 of metal can be processed into by cam-turning.
Referring to Fig. 7, two capillaries 4 are set on metal detection seat 1 usually, wherein a capillary is a process duct, need behind the good liquid medium of can, to seal, kapillary 4 is made by containing chromium NiTi stainless steel material, and the welding method of present embodiment is undertaken by following step preface substantially, that is:
Step preface 1 forms many capillaries by the hole detecting on the seat 1, choosing the outside surface that should make kapillary 4 and detecting seat formation of its diameter closely contacts, and uses chemical, for example with the greasy dirt on acetone or the absolute ethyl alcohol cleaning components; Step preface 2 is passed kapillary 4 and is detected seat 1, and makes kapillary exceed about 0.5 millimeter of detection seat cavity bottom surface, cleans the raised area capillaceous with chemical again; Step preface 3 will be slightly larger than atmospheric pressure, the absolute pressure of 0.01 megabar and freezing a little for example, and 0 ℃ argon gas for example feeds from an end of need welding kapillary 4, from its other end discharge.
More than each welding step preface, adjust by hand usually, welding current is adjustable to about 30 amperes, can cut off or extinguish arcs by the decay button that starts welding machine.
In said method, owing in kapillary, constantly pass through freezing a little gas, make in carrying out welding process, kapillary causes kapillary to stop up because of being subjected to cooling off can sharply not melting.
Therefore, adopt this welding method can guarantee the long capillary tube time under the high temperature more than 300 ℃, bear the maximum pressure about 40 megabars and do not produce liquid medium and sew through weld seam.
In addition, the also welding capillaceous that the welding method that adopts present embodiment is carried out, with the welding capillaceous of adopting traditional fine welding method to carry out, with welded specimen its weld strength is compared test respectively, test findings shows the former, the parent that promptly adopts gas-cooling capillary is from melting welding, sample bears the pulling force of 0.65 megabar, cause kapillary to be broken, and weld seam is earlier good, and the latter promptly adopts the fine kapillary that welds, when sample bore 0.46 megabar pulling force, kapillary was pulled out from the commissure.Therefore the former weld strength obviously is better than the latter's weld strength.
In addition, owing to also adopt the parent self-melting and welding method between the elastic metallic diaphragm 3 of present embodiment and the detection seat 1, add the effect of improvement factor on the pressure detecting assembly structure, once the use scene that respectively present embodiment pressure transducer and traditional pressure transducer is placed on simultaneously roughly the same condition of work was investigated, traditional pressure transducer can only continuous working about 1 year, and concerning the present embodiment sensor, show and still can continue to work reliably.
Pressure transducer of the present utility model, be more than 300 ℃ generally in the measured medium temperature, the medium absolute pressure is the condition of work about 35 megabars, the instrument manufacturing accuracy can reach 1 to 1.5 grade, has the automatic compensating action of good zero temperature drift, use power frequency AC, the dc signal of generation can connect with general all kinds of secondary instruments.
In addition, pressure transducer is before being installed to equipment under test, need on pressure calibration, to carry out static check and debugging, pressure detecting part can be installed to equipment under test on thereafter, installing generally to make the detection seat end face of pressure detecting assembly and the inside surface of equipment pipe flush, and fastening by the elastic washer sealing, after the equipment for the treatment of like this heats up, need not to adjust again.
In addition, in above-mentioned each figure, identical number is represented identical or same parts.
In addition, the parent self-melting and welding method of the capillary that the utility model proposes and hardware body, also can not only be applicable to the manufacturing of pressure sensor, every under needs carry out welding situation between capillary and the described hardware body to other, all can utilize the method to solve Welding Problems between the even part of material became uneven, therefore, all welding methods of creating according to this aim application the utility model also will be included in the claim scope of method of the present utility model.
Claims (3)
1, a kind of diaphragm type pressure medium sensor comprises pressure detecting part, and pressure signal changes the housing parts of holding device and holding the pressure signal conversion equipment,
Pressure detecting part comprises diaphragm mode pressure detecting assembly, and this pressure detecting assembly comprises the detection pedestal of metal, elastic metallic diaphragm and metal capillary,
Has a cylinder dish shape cavity on the upper surface of detection pedestal, the elastic metallic diaphragm seal covers this cavity, one end of metal capillary passes the detection pedestal, be communicated with described cavity, and and detect between the pedestal and form a fixed connection, the pressure detecting part parts are connected with the pressure signal conversion equipment by kapillary, full of liquid medium in the closed system of being made up of kapillary and cavity
The detection pedestal that it is characterized in that the metal that described diaphragm mode pressure detecting assembly comprises, has cylinder dish cavity on its upper end, the elastic metallic diaphragm has with described cavity shapes similar, and is only shallow than described cavity, can embed the cylinder dish shape of described cavity.
2, pressure medium sensor according to claim 1, it is characterized in that described housing parts is a multilayer modular construction, fuse by chimeric and mechanical fastener combination, each ingredient with the pressure signal conversion equipment is placed in the different combination layers respectively.
3, pressure medium sensor according to claim 1 and 2 is characterized in that forming one or multi-channel wave-like on the end of described metallic membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87208989 CN87208989U (en) | 1987-06-09 | 1987-06-09 | Diaphragm-type pressure sensing device for movable medium at high temperature and pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87208989 CN87208989U (en) | 1987-06-09 | 1987-06-09 | Diaphragm-type pressure sensing device for movable medium at high temperature and pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87208989U true CN87208989U (en) | 1988-03-30 |
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ID=4824159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87208989 Expired - Lifetime CN87208989U (en) | 1987-06-09 | 1987-06-09 | Diaphragm-type pressure sensing device for movable medium at high temperature and pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87208989U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102341684A (en) * | 2009-03-06 | 2012-02-01 | 德怀尔仪器公司 | Pressure Gage with Magnetically Coupled Diaphragm |
-
1987
- 1987-06-09 CN CN 87208989 patent/CN87208989U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102341684A (en) * | 2009-03-06 | 2012-02-01 | 德怀尔仪器公司 | Pressure Gage with Magnetically Coupled Diaphragm |
| US8495916B2 (en) | 2009-03-06 | 2013-07-30 | Dwyer Instruments, Inc. | Mounting apparatus for a pressure gage |
| US8511167B2 (en) | 2009-03-06 | 2013-08-20 | Dwyer Instruments, Inc. | Pressure gage with removable housing and helix |
| US8528412B2 (en) | 2009-03-06 | 2013-09-10 | Dwyer Instruments, Inc. | Pressure gage with removable seal member and diaphragm |
| US8528410B2 (en) | 2009-03-06 | 2013-09-10 | Dwyer Instruments, Inc. | Pressure gage with flexible beam and clamping member |
| CN102341684B (en) * | 2009-03-06 | 2014-11-26 | 德怀尔仪器公司 | Pressure gage with magnetically coupled diaphragm |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |