CN87207839U - Combined pressure and pressure-difference transmitter - Google Patents
Combined pressure and pressure-difference transmitter Download PDFInfo
- Publication number
- CN87207839U CN87207839U CN 87207839 CN87207839U CN87207839U CN 87207839 U CN87207839 U CN 87207839U CN 87207839 CN87207839 CN 87207839 CN 87207839 U CN87207839 U CN 87207839U CN 87207839 U CN87207839 U CN 87207839U
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- pressure
- room
- flat diaphragm
- low pressure
- low
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Abstract
The utility model relates to a pressure-difference transmitter, which is mainly used for changing a pressure signal into a useful electrical quantity signal to do production links of automatic measurement and automatic control. The inner walls of the high and the low pressure containing chambers of the utility model are concave curved surfaces. An overload protection mechanism is simple and reliable, and the high and the low pressure containing chambers are respectively provided with detection coils. The coils are used as two bridge arms of an electric bridge in a detection circuit. Temperature drift is small, and pressure sensors can be installed in the high and the low voltage containing chambers to measure the pressure-difference and static pressure simultaneously; one meter has two purposes.
Description
Pressure that the utility model relates to and differential pressure combination transmitter are the pick-up units of a kind of pressure and differential pressure; Be used for measurand convert to definite corresponding relation arranged with it power consumption output arranged, be particularly useful for detecting automatically and automatic control system.
Widely used force balance type pressure or differential pressure transmitter are converted to mechanical force by measuring pressure or differential pressure signal by sensitive element in commercial production, and the main lever of the balanced controls of exerting all one's strength produces skew, drive the detection lug of paying lever simultaneously and produce displacement; Amplifier detects after testing, exports an electric quantity signal, and electromagnetism counter-force and mechanical force that electric quantity signal is produced balance each other.The electric quantity signal of amplifier output is directly proportional with the pressure or the differential pressure signal of input.This force balance type pressure or differential pressure transmitter, though there is one to have that the degree of depth is degenerative poor system, its throw-over gear more complicated, and Dynamic response is low, volume is big, and exists limitation because of manufacturing cost is high.Pressure or differential pressure transmitter that another kind utilizes eddy current principle to make are acted on sensitive element by measuring pressure or differential pressure, and the distance of itself and magnetic test coil is changed, and detect through metering circuit and amplify, and output one has the electric weight of determining relation with displacement.Telefault in the metering circuit is because of its structural reason and factors such as residual magnetism and magnetoconductivity, and its inductance value changes with the variation of temperature and humidity, and directly the size of electric weight is exported in influence, and temperature is floated and caused measuring error more greatly.In the general pressure or differential pressure transmitter, its sensitive element mainly adopts diaphragm or bellows, and its overload capacity is little; must connect impact damper during use; overload protection arrangement adopts stop protection or sealing liquid protection, and performance is reliable inadequately, and needs after the overload could use through adjusting.Pressure that uses in the commercial production or differential pressure transmitter are simple functions, and promptly an error of measurement is pressed or only surveyed static pressure, can not fully satisfy request for utilization.Often need gaging pressure or differential pressure simultaneously in the actual measurement, adopt pressure of the prior art or differential pressure transmitter, just need two covering devices, economical inadequately.
Task of the present utility model is to remedy existing above-mentioned deficiency in the prior art and a kind of compact conformation is provided, and overload protection is reliable, and pressure that measuring accuracy is high and differential pressure can simultaneously-measured combination transmitters; To reach low cost of manufacture, the purpose that result of use is good.
The utility model proposes of task is finished by following measure: the utility model is installed the flat diaphragm that pretightning force is arranged in the middle of the high and low pressure room, be provided with flat thin magnetic test coil respectively in the both sides of flat diaphragm, when tested working medium enters the high and low pressure room, make the center of flat diaphragm produce displacement, pass through magnetic test coil, metering circuit and amplifier obtain one and the corresponding electric weight output of flat diaphragm displacement.For the flat diaphragm overload time is protected, the inwall of high and low pressure room is made the concave curved surface shape, and a pressure room therein installs a pressure transducer, so that measure static pressure and differential pressure simultaneously.
Following the utility model describes in detail in conjunction with the embodiments:
Fig. 1 is the structural representation of an embodiment of the utility model.
Fig. 2 is detection and the amplifying circuit schematic diagram of an embodiment of the utility model.
Fig. 3 is the flat diaphragm structural representation of an embodiment of the utility model.
Fig. 4 is the magnetic test coil synoptic diagram of an embodiment of the utility model.
Pressure as shown in Figure 1 and differential pressure combination transmitter, pedestal (1) and (2) tighten together by attachment screw (3), in the middle of flat diaphragm (4) is installed in, have formed high pressure room (5) and low pressure room (6).The symmetria bilateralis of flat diaphragm (4) center be provided with the flat thin circular coil (7) of measuring that two photoetching form.When tested working medium enters high and low pressure room (5), (6) by high pressure room interface (8) and low pressure room interface (9), owing to there is pressure reduction, flat diaphragm (4) generative center displacement as sensitive element, electric current and the phase place measured in the coil (7) are all changed, displacement is directly proportional with the size of pressure reduction, and variable quantity and displacement size have a corresponding relation of determining; The center of flat diaphragm (4) is the closer to magnetic test coil (7), and the eddy effect in the flat diaphragm (4) is stronger, and the effective inductance amount of magnetic test coil (7) is also just little.The electric signal of magnetic test coil (7) electric current and phase change is by metering circuit (10), amplifier (11), exports one and is convenient to the power consumption signal that has that shows, write down, control and handle.The maximum permission of flat diaphragm (4) deflection is limited, surpass the certain deformation amount and will produce plastic yield, thereby in the utility model, the inwall of high and low pressure room (5), (6) is processed into symmetrical concave curved surface (p), the maximum flexibility deflection that its higher primary school allows in flat diaphragm (4).When tested power pressure is undergone mutation, during the distortion of flat diaphragm (4) single-track overload generation maximum flexibility, the shape of flat diaphragm (4) is just in time coincide with concave curved surface (p), and the flat diaphragm (4) of this moment still is an elastic deformation.When single-track overload is removed, flat diaphragm (4) can recover former state, plays the effect of overload protection.For pressure inverting and differential pressure transporting are organically combined, pressure transducer (F) has been installed in high pressure room (5), in like manner also can be installed in low pressure room (6), be used for the static pressure measurement of high and low pressure room (5), (6).Two kinds of measurement functions are combined, and had only two room interfaces (8), (9) to simplify general structure.(12) are power transformer among Fig. 1, and (13) are case, and (14) are socket, and the input high and low pressure room that is used for the output of electric quantity signal and power supply all is provided with the screw of releasing (15) and is used for exhaust, discharge opeing and cleaning.
Detection as shown in Figure 2 and amplifying circuit schematic diagram, power transformer (12) carries out step-down to the input power supply, by diode (D
1～D
4) and commutation capacitor (C
1) filtering, after voltage stabilizer (W) voltage stabilizing, use for testing circuit.By transistor (T
1) wait the oscillator of composition, to isolate through field effect transistor (J) and amplify, magnetic test coil (7) is as adjacent two brachium pontis of electric bridge and (R
1), (R
2), (C
3), (C
2) form passive alternating current bridge, and when initial state, make electric bridge keep balance.The displacement of flat diaphragm in the detection (4) changes the impedance of magnetic test coil (7), electric bridge so out of trim, and the changing value of magnetic test coil (7) impedance is through diode (D
5), (D
6) detection and amplifier (A
1), (A
2) amplification, convert electric current output to, the static pressure value of high pressure room (5) by the detection of pressure transducer (F) through amplifier (A
3), (A
4) amplify and also to convert electric current output to, (RLc) (RLy) is respectively external load among Fig. 2.
Flat diaphragm as shown in Figure 3 (4) is fixed on the annulus (16) along its circumference, and make flat diaphragm (4) that certain pretightning force be arranged, to improve the linearity of transmitter, remedy the deficiency of temperature effect deformation, when tested working medium feeds high and low pressure room (5), (6) of flat diaphragm (4) both sides, make flat diaphragm (4) center produce displacement.By the relation between measuring pressure or differential pressure and flat diaphragm (4) the center displacement not only and the diameter of flat diaphragm (4) and annulus (16), thickness and material are relevant, but also relevant with the ratio between displacement and the thickness.Flat diaphragm of the present utility model (4) adopts stainless steel material also can adopt beryllium-bronze or phosphor bronze, is not have the permanent alloy that plays that expands as also can adopt manganese one palladium for heatproof, the heat resistance that improves flat diaphragm (4).Adopt flat diaphragm as measuring sensor, exist the little deficiency of center displacement, the utility model mainly adopts highly sensitive bridge-type metering circuit to solve.
Magnetic test coil as shown in Figure 4 (7) adopts the method for photoetching to make flat thin discs shape with copper foil plate, also can corrode the toroid winding that forms with printed circuit board (PCB).The size of the transmitter range of linearity, sensitivity high and low all relevant with shape, the size of coil (7) is because the Distribution of Magnetic Field that the shape of coil, size directly influence coil to be produced.Magnetic test coil (7) is as two brachium pontis of alternating current bridge in the metering circuit, and the element of this alternating current bridge symmetry as far as possible is consistent, so that the drift that temperature variation produces is cancelled each other.In order to reduce temperature, humidity scribbles corrosion protection, moisture-proof coating to the influence of magnetic test coil (7) inductance value on the surface of magnetic test coil simultaneously.
The utility model compared with prior art has the following advantages: simple and compact for structure, volume is little, in light weight; differential pressure and static pressure can be measured simultaneously, and protection reliably can be satisfied the requirement of commercial measurement during overload; and production cost is low, has preferably economic benefit.
Claims (3)
1, a kind of differential pressure transmitter, contain sensitive element, sensing element and detection amplifying circuit, pressure signal is through sensitive element, sensing element and detection amplifying circuit convert electric weight output to, it is characterized in that: at height, low room (5), the flat diaphragm (4) that tensile force is arranged is installed (6), this flat diaphragm (4) is fixed on the annulus (16) along circumference, high, low pressure room (5), (6) inwall is the concave curved surface (P) of symmetry, at height, low pressure room (5), a magnetic test coil (7) is arranged respectively (6), and this magnetic test coil (7) is the adjacent brachium pontis of alternating current bridge two.
2, differential pressure transmitter as claimed in claim 1 is characterized in that: can setting pressure sensor (F) in high pressure room (5) or low pressure room (6) and have only two room interfaces (8), (9).
3, differential pressure transmitter as claimed in claim 1 is characterized in that: the maximum flexibility deflection that the higher primary school of the concave curved surface (P) of high and low pressure room (5), (6) allows in the flat diaphragm center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87207839 CN87207839U (en) | 1987-05-07 | 1987-05-07 | Combined pressure and pressure-difference transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87207839 CN87207839U (en) | 1987-05-07 | 1987-05-07 | Combined pressure and pressure-difference transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87207839U true CN87207839U (en) | 1988-07-13 |
Family
ID=4823218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87207839 Pending CN87207839U (en) | 1987-05-07 | 1987-05-07 | Combined pressure and pressure-difference transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87207839U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7360431B2 (en) | 2003-08-20 | 2008-04-22 | Yamatake Corporation | Pressure sensor device including a diaphragm and a stopper member having a curved surface facing the diaphragm |
| CN107063485A (en) * | 2017-04-05 | 2017-08-18 | 河南省计量科学研究院 | A kind of refrigerator current draw test temperature transducer locating support and its localization method |
| CN108106758A (en) * | 2017-12-21 | 2018-06-01 | 中国电子科技集团公司第四十八研究所 | A kind of silicon fiml current vortex micro-pressure sensor |
| CN110595672A (en) * | 2019-08-19 | 2019-12-20 | 江苏杰克仪表有限公司 | Novel high-accuracy differential pressure transmitter |
-
1987
- 1987-05-07 CN CN 87207839 patent/CN87207839U/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7360431B2 (en) | 2003-08-20 | 2008-04-22 | Yamatake Corporation | Pressure sensor device including a diaphragm and a stopper member having a curved surface facing the diaphragm |
| CN107063485A (en) * | 2017-04-05 | 2017-08-18 | 河南省计量科学研究院 | A kind of refrigerator current draw test temperature transducer locating support and its localization method |
| CN107063485B (en) * | 2017-04-05 | 2023-06-02 | 河南省计量科学研究院 | Refrigerator power consumption test temperature sensor positioning bracket and positioning method thereof |
| CN108106758A (en) * | 2017-12-21 | 2018-06-01 | 中国电子科技集团公司第四十八研究所 | A kind of silicon fiml current vortex micro-pressure sensor |
| CN108106758B (en) * | 2017-12-21 | 2020-06-26 | 中国电子科技集团公司第四十八研究所 | Silicon film eddy current micro-pressure sensor |
| CN110595672A (en) * | 2019-08-19 | 2019-12-20 | 江苏杰克仪表有限公司 | Novel high-accuracy differential pressure transmitter |
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