CN204346632U - A kind of differential pressure pickup adopting composite bridge road - Google Patents
A kind of differential pressure pickup adopting composite bridge road Download PDFInfo
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- CN204346632U CN204346632U CN201420768967.XU CN201420768967U CN204346632U CN 204346632 U CN204346632 U CN 204346632U CN 201420768967 U CN201420768967 U CN 201420768967U CN 204346632 U CN204346632 U CN 204346632U
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- pressure sensitive
- bridge road
- output terminal
- composite bridge
- base
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Abstract
A kind of differential pressure pickup adopting composite bridge road, comprise base and a protecting crust be encapsulated on base that one it is equipped with electric connector, two pressure sensitive cores are provided with in protecting crust, one block signal card extender and a block signal conditioning plate, the surface of two pressure sensitive cores all adopt ion beam sputtering be manufactured with the sheet resistance that a group has voltage-sensitive effect, according to the group bridge mode of Wheatstone bridge, this cluster film resistance is carried out group bridge, and by Si-Al wire, the leading point of Wheatstone bridge is soldered on Signals Transfer Board, the output terminal on composite bridge road is connected to electric connector by signal regulating panel is defeated again, base has the oilhole that two pass to two pressure sensitive core inner chambers respectively.This differential pressure pickup adopts the mode of bridge road combination to ask poor to two pressure signals, and processes difference signal, to meet the desired output requirement, while minimizing input noise, effectively improves the symmetry of measuring accuracy and the output of positive negative sense.
Description
Technical field
The utility model relates to a kind of differential pressure pickup that can realize asking two input pressures poor employing composite bridge road, is mainly used in requiring that higher, positive negative sense exports the good servo control mechanism pressure measurement field of symmetry to pressure differential measuring accuracy.
Background technology
Differential pressure pickup is used to realize asking two input pressure signals subtracting, and carries out the sensor that exports in a certain way, and product is widely used in servo control mechanism pressure measurement industry.Existing differential pressure pickup realizes pressure signal and asks the mode subtracted to be first amplify respectively two input pressure signals, again the Differential Input of two amplifying signals as operational amplifier is carried out asking subtracting, after carrying out certain signal transacting, obtain required output signal.Although before amplifying two paths of signals, have also been made some filtering process, but due to two-way amplifying signal is just asked subtract time, amp.in input be two paths of signals, the most most one times of the noise ratio one road input signal introduced thus, thus causes the precision outputed signal to reduce; Simultaneously because instrument amplifier is larger for the fault in enlargement of small-signal, two-pass DINSAR input signal is adopted to carry out the words of amplifying, further increase the output accuracy of small-signal, and then cause the measuring accuracy of sensor to reduce, cause positive negative sense to export symmetry low simultaneously.
Utility model content
The purpose of this utility model is that not high, the positive negative sense of measuring accuracy overcoming prior art existence exports the defects such as symmetry is low, and then provides high, the positive negative sense of a kind of measuring accuracy to export the differential pressure pickup of the employing bridge road array mode that symmetry is high, Frequency Response is excellent.
For achieving the above object and adopt technical solution as described below.
A kind of differential pressure pickup adopting composite bridge road, comprise a base it being equipped with electric connector and welding and be encapsulated in protecting crust on base, two pressure sensitive cores are arranged with in the housing of protecting crust, one block signal card extender and a block signal conditioning plate, the surface of two pressure sensitive cores all adopt ion beam sputtering be manufactured with the sheet resistance that a group has voltage-sensitive effect, according to the group bridge mode of Wheatstone bridge, this cluster film resistance is carried out group bridge, and be that the leading point of Wheatstone bridge is soldered on Signals Transfer Board by the Si-Al wire of 0.2mm by diameter, the adjustment of sensitivity resistance corresponding with it is serially connected with respectively at the feeder ear of two pressure sensitive cores, the output terminal on composite bridge road is connected to electric connector by defeated after the signal conditioning circuit on signal regulating panel again, the bottom surface of base has the oilhole that two pass to two pressure sensitive core inner chambers respectively.
In above-mentioned differential pressure pickup, the forward output terminal of the first pressure sensitive core in two pressure sensitive cores and the negative sense output terminal short circuit of the second pressure sensitive core, as the forward output terminal on composite bridge road, the negative sense output terminal of the first pressure sensitive core and the forward output terminal short circuit of the second pressure sensitive core, as the negative sense output terminal on composite bridge road, the feeder ear of two pressure sensitive cores is connected in series short circuit after respective output sensitivity regulating resistance, as the feeder ear on composite bridge road, the direct short circuit of earth terminal of two pressure sensitive cores, as the earth terminal on composite bridge road, signal regulating panel is provided with the signal conditioning circuit be made up of AD584SH/883B and AD620SQ/883B, forward output terminal and the negative sense output terminal on composite bridge road are connected to electric connector through signal conditioning circuit.
Technical solution of the present utility model also comprises: two pressure sensitive cores are welded on base by laser bonding mode, and protecting crust passes through together with laser bonding with base.
Technical solution of the present utility model also comprises: on base, be provided with four for the mounting hole with hydraulic machinery attaching.
In real work, hydraulic oil enters two pressure sensitive core inner chambers respectively by two oilholes, so the Hui Sitong bridge road of thin film sputtering converts the pressure signal sensed to electric signal on two pressure sensitive cores, and the mode adopting bridge road to combine on Signals Transfer Board is asked two pressure signals and is differed from and export, it is zoomed into required signal and does filtering process by the signal conditioning circuit again on signal regulating panel, export finally by electric connector, meet the output requirement that servo control mechanism pressure measurement field high precision and positive negative sense export high symmetry.
Compared with prior art, the beneficial effects of the utility model are:
1, differential pressure pickup described in the utility model adopts the pressure measurement project organization on composite bridge road, and negative sense output symmetry is good by force, just for (≤11mA) low in energy consumption, output accuracy high (≤0.5%), antijamming capability;
2, the utility model adopts the electronic devices and components of high precision, wide warm area, high reliability, and therefore operating temperature range is wide, and output temperature characteristic is good, and thermal zero drift is little;
3, in this differential pressure pickup structure, sensitive core body is welded by Laser Welding (LBW) with base, weld seam pressure-bearing reaches 50MPa, and whole sensitive core body and circuit board by laser bonding, thus seal by protecting crust and base, and carry out the shielding of electromagnetic interference (EMI), ensure that the reliability of sensor measurement;
4, reasonable in design of the present utility model, the structural reliability taken into full account, therefore anti-vibration, impact capacity are strong.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model specific embodiment.
Fig. 2 is that the B of Fig. 1 is to structural representation.
Fig. 3 is the circuit theory diagrams that the utility model pressure sensitive core and Signals Transfer Board carry out the combination of bridge road, and in figure, Sensor1 and Sensor2 is respectively sensor 1 and sensor 2.
The title of each figure notation in figure is respectively: 1-protecting crust, 2-signal regulating panel, 3-first pressure sensitive core, 4-base, 5-oilhole, 6-electric connector, 7-oilhole, 8-second pressure sensitive core, 9-Signals Transfer Board, 10-packing washer, 11-mounting hole.
Embodiment
See accompanying drawing, differential pressure pickup described in the utility model is by base 4, protecting crust 1, first pressure sensitive core 3 (Sensor1 in Fig. 3, i.e. sensor 1), the second pressure sensitive core 8 (in Fig. 3 Sensor2, i.e. sensor 2), the part such as signal regulating panel 2, Signals Transfer Board 9 composition.Protecting crust 1 seals (welding) and is arranged on base 4, the surface of two pressure sensitive cores all adopt ion beam sputtering be manufactured with the sheet resistance that a group has voltage-sensitive effect, according to the group bridge mode of Wheatstone bridge, this cluster film resistance is carried out group bridge, and be that the leading point of Wheatstone bridge is soldered on Signals Transfer Board 9 by the Si-Al wire of 0.2mm by diameter, this composite bridge road is only realize by being connected in series the adjustment of sensitivity resistance corresponding with it respectively at the feeder ear of the first pressure sensitive core 3 and the second pressure sensitive core 8, without the need to additional integrated circuit.The output terminal on composite bridge road connects with the input end of the signal conditioning circuit on signal regulating panel 2.Base 4 is provided with the electric connector 6 be connected with signal regulating panel 2 output line, the bottom surface of base 4 having the oilhole 5,7 that two pass to first and second pressure sensitive core 3,8 inner chamber respectively, on the bottom surface of base 4, being also provided with four mounting holes 11 for being connected with servo control mechanism hydraulic machinery in addition.
Circuit design structure of the present utility model is see Fig. 3.The forward output terminal of the first pressure sensitive core 3 (Sensor1) and the negative sense output terminal short circuit of the second pressure sensitive core 8 (Sensor2), as the forward output terminal on composite bridge road, the negative sense output terminal of the first pressure sensitive core 3 (Sensor1) and the forward output terminal short circuit of the second pressure sensitive core 8 (Sensor1), as the negative sense output terminal on composite bridge road, the feeder ear of two pressure sensitive cores was connected in series short circuit after the output sensitivity regulating resistance corresponding with it respectively, as the feeder ear on composite bridge road, the direct short circuit of earth terminal of two pressure sensitive cores, as the earth terminal on composite bridge road.Signal regulating panel 2 is provided with the signal conditioning circuit be made up of AD584SH/883B and AD620SQ/883B, and forward output terminal and the negative sense output terminal on composite bridge road are connected to electric connector 6 through signal conditioning circuit.
[application example]
The method adopting differential pressure pickup described in the utility model to measure servo-drive system two pressure interface pressure differentials realizes according to the following steps:
The first step, the groove at sensor two pressure oil port places places packing washer 10, is installed to by sensor on the testing pressure source (pretectum of engine) in servo-drive system, by the fastening mounting screw of mounting hole 11;
Second step, is connected in sensor data acquisition system by the electric connector of sensor by sensor, opens electric power system, carry out full-scale pressure loading to sensor, and after maintaining half a minute, relief pressure, then continues pressurization, pressure release, three times altogether like this;
3rd step, gathers the output of sensor, and the data collected are the zero point of sensor;
4th step, certain force value is applied respectively to two pressure sources of servo-drive system, even if hydraulic oil is by left, right two oilholes 5, 7 enter the first pressure sensitive core 3 respectively, second pressure sensitive core 8 inner chamber, after pressure stabilisation, two pressure sensitive cores (3 that sensor two pressure interfaces are corresponding, 8) all can be subject to certain pressure and produce deformation, two pressure sensitive cores (3, 8) after the diaphragm type Wheatstone bridge on senses pressure signal, its resistance separately on brachium pontis also can occur correspondingly to change, combined by bridge road, the change of two bridge resistance,s is converted into the difference of two electric signal and exports, amplified by the conditioning of signal conditioning circuit plate again, this electric signal is delivered to the output terminal of sensor, thus arrived by data acquisition system, because sensor output voltage and two pressure signal differences have corresponding relation V
o=k (P
1-P
2), V
ofor the output voltage of sensor, P
1, P
2be respectively the pressure suffered by the first pressure sensitive core 3, second pressure sensitive core 8, k is scale-up factor, and follow-up signal disposal system just can converse the pressure differential of two pressure sources after pick-up transducers output voltage according to this corresponding relation.
Claims (4)
1. one kind adopts the differential pressure pickup on composite bridge road, comprise a base (4) it being equipped with electric connector (6) and welding and be encapsulated in protecting crust (1) on base (4), it is characterized in that: in the housing of protecting crust (1), be arranged with two pressure sensitive cores, one block signal card extender (9) and a block signal conditioning plate (2), the surface of two pressure sensitive cores all adopt ion beam sputtering be manufactured with the sheet resistance that a group has voltage-sensitive effect, according to the group bridge mode of Wheatstone bridge, this cluster film resistance is carried out group bridge, and be that the leading point of Wheatstone bridge is soldered on Signals Transfer Board (9) by the Si-Al wire of 0.2mm by diameter, the adjustment of sensitivity resistance corresponding with it is serially connected with respectively at the feeder ear of two pressure sensitive cores, the output terminal on composite bridge road is connected to electric connector (6) by defeated after the signal conditioning circuit on signal regulating panel (2) again, the bottom surface of base (4) has the oilhole (5 that two pass to two pressure sensitive core inner chambers respectively, 7).
2. the differential pressure pickup on employing composite bridge road according to claim 1, it is characterized in that: the forward output terminal of the first pressure sensitive core (3) in two pressure sensitive cores and the negative sense output terminal short circuit of the second pressure sensitive core (8), as the forward output terminal on composite bridge road, the negative sense output terminal of the first pressure sensitive core (3) and the forward output terminal short circuit of the second pressure sensitive core (8), as the negative sense output terminal on composite bridge road, the feeder ear of two pressure sensitive cores is connected in series short circuit after respective output sensitivity regulating resistance, as the feeder ear on composite bridge road, the direct short circuit of earth terminal of two pressure sensitive cores, as the earth terminal on composite bridge road, signal regulating panel (2) is provided with the signal conditioning circuit be made up of AD584SH/883B and AD620SQ/883B, the forward output terminal on composite bridge road and negative sense output terminal are connected to electric connector (6) through signal conditioning circuit.
3. the differential pressure pickup on employing composite bridge road according to claim 1, it is characterized in that: two pressure sensitive cores are welded on base (4) by laser bonding mode, protecting crust (1) and base (4) are by together with laser bonding.
4. the differential pressure pickup on employing composite bridge road according to claim 1, is characterized in that: on base (4), be provided with four for the mounting hole (11) with hydraulic machinery attaching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420768967.XU CN204346632U (en) | 2014-12-08 | 2014-12-08 | A kind of differential pressure pickup adopting composite bridge road |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420768967.XU CN204346632U (en) | 2014-12-08 | 2014-12-08 | A kind of differential pressure pickup adopting composite bridge road |
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| Publication Number | Publication Date |
|---|---|
| CN204346632U true CN204346632U (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420768967.XU Expired - Fee Related CN204346632U (en) | 2014-12-08 | 2014-12-08 | A kind of differential pressure pickup adopting composite bridge road |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403349A (en) * | 2015-12-25 | 2016-03-16 | 陕西电器研究所 | Four-redundancy differential pressure sensor adopting combined bridge circuits |
| CN105628289A (en) * | 2015-12-25 | 2016-06-01 | 陕西电器研究所 | Four-redundancy pressure sensor adopting sputtering film core body |
| CN107192848A (en) * | 2015-07-22 | 2017-09-22 | 王振环 | Human body based on Wheatstone bridge accelerates or ability comparison means of having an effect |
-
2014
- 2014-12-08 CN CN201420768967.XU patent/CN204346632U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192848A (en) * | 2015-07-22 | 2017-09-22 | 王振环 | Human body based on Wheatstone bridge accelerates or ability comparison means of having an effect |
| CN105403349A (en) * | 2015-12-25 | 2016-03-16 | 陕西电器研究所 | Four-redundancy differential pressure sensor adopting combined bridge circuits |
| CN105628289A (en) * | 2015-12-25 | 2016-06-01 | 陕西电器研究所 | Four-redundancy pressure sensor adopting sputtering film core body |
| CN105628289B (en) * | 2015-12-25 | 2019-03-26 | 陕西电器研究所 | A kind of four remaining pressure sensors using sputtered film core |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20211208 |