CN108267258B - Large-overload high-precision strain type pressure sensor - Google Patents
Large-overload high-precision strain type pressure sensor Download PDFInfo
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- CN108267258B CN108267258B CN201810146529.2A CN201810146529A CN108267258B CN 108267258 B CN108267258 B CN 108267258B CN 201810146529 A CN201810146529 A CN 201810146529A CN 108267258 B CN108267258 B CN 108267258B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
- G01L7/08—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the flexible-diaphragm type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
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- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to a large-overload high-precision strain type pressure sensor, which aims to solve the problem that the high-precision measurement requirements under the conditions of large overload, vibration resistance, impact resistance and complex electromagnetic environment are required to be met when the pressure of a normal-temperature pipeline of the conventional liquid oxygen kerosene engine is measured. The cable connector comprises a sensitive element, a shielding assembly, a filler neck, a shell, a cable, an electric connector, silicon rubber and epoxy rubber; the epoxy glue, the silicon rubber and the sensitive element are arranged in the shell; the sensitive element comprises an elastic diaphragm, a strain gauge and a compensation circuit printed board, wherein the upper surface of the elastic diaphragm is provided with an upper groove, the lower surface of the elastic diaphragm is provided with a lower groove, the strain gauge is adhered to the bottom surface of the upper groove of the elastic diaphragm, the lead of the strain gauge is connected to the compensation circuit printed board, the compensation circuit printed board is connected with a cable, and the cable sequentially passes through silicon rubber, epoxy glue and a shielding assembly to be connected with an electric connector; the shielding assembly is arranged at the joint of the shell and the cable and comprises a cable fixing seat and a shielding layer, and the filler neck is fixedly arranged on one side of the shell.
Description
Technical Field
The invention relates to the field of pressure sensors, in particular to a large-overload high-precision strain type pressure sensor which can be used for pressure measurement of a normal-temperature pipeline of a liquid oxygen kerosene engine in large-overload, large-impact and complex electromagnetic environments and can also be applied to medium pressure measurement under general environmental conditions.
Background
The sensor technology runs through the whole process of liquid rocket engine development, and a high-precision, high-stability and high-reliability sensor is an important guarantee condition for liquid rocket engine development, with the development of a new generation of liquid oxygen kerosene engine and a heavy engine, the application of high thrust and clean propellant not only increases the measurement range of the sensor and makes the working environment more severe, but also needs the sensor to bear severe conditions such as high and low temperature, strong vibration, large impact and the like, in addition, in order to reduce effective load, the requirements of small volume, light weight and low power consumption are provided for the sensor matched with the engine, so the pressure measurement of a liquid oxygen kerosene engine normal temperature pipeline needs to solve the following problems that ① is large in overload, the instantaneous water impact pressure can reach 2-3 times of rated pressure, ② is vibration resistant and impact resistant, the vibration magnitude is greater than 100Grms, and the high-precision measurement problem under the complicated electromagnetic environment condition of ③.
Disclosure of Invention
The invention aims to solve the problem that the high-precision measurement requirements under the conditions of large overload, vibration resistance, impact resistance and complex electromagnetic environment need to be met when the pressure of a normal-temperature pipeline of the conventional liquid oxygen kerosene engine is measured, and provides a large-overload high-precision strain type pressure sensor.
The technical solution of the present invention to solve the above problems is,
a large-overload high-precision strain type pressure sensor comprises a sensitive element, a shielding assembly, a filler neck, a shell, a cable, an electric connector, silicon rubber and epoxy rubber; the epoxy glue, the silicon rubber and the sensitive element are sequentially arranged in the shell; the sensitive element comprises an elastic diaphragm, a strain gauge and a compensation circuit printed board, wherein the elastic diaphragm is a variable-thickness diaphragm, an upper groove is formed in the upper surface of the elastic diaphragm, a lower groove is formed in the lower surface of the elastic diaphragm, the bottom surface of the upper groove is a plane, the bottom surface of the lower groove is a smooth transition curved surface, the curved surface ensures that the tangential strain of the center of the diaphragm and the radial strain of the edge of the diaphragm are uniformly distributed, the strain gauge forming a Wheatstone full bridge is adhered to the bottom surface of the upper groove of the elastic diaphragm, the lead of the strain gauge is connected to the compensation circuit printed board, the compensation circuit printed board is connected with a cable for signal transmission, and the cable sequentially penetrates through silicon rubber; the shielding assembly is arranged at the joint of the shell and the cable and comprises a cable fixing seat and a shielding layer; the cable fixing seat is fixedly connected with the shell, one end of the shielding layer is arranged at the bottom of the inner side of the cable fixing seat, the other end of the shielding layer is fixedly connected with the electric connector, and the shell and the cable fixing seat are made of metal; the filler neck is fixedly arranged on one side of the shell and is fixedly connected with the elastic membrane, and a through hole is formed in the middle of the filler neck.
Further, the shielding assembly is connected with the shell and the electric connector into a whole in a laser welding mode.
Further, the one end of shielding layer is provided with the outside boss, the both ends of boss are provided with the clamping ring, the shielding layer sets up in the inboard bottom of cable fixing base through two clamping rings.
Furthermore, an outer sleeve nut is fixedly arranged on the outer side of the filler neck.
Furthermore, the elastic membrane is made of stainless steel.
Further, the elastic diaphragm and the compensation circuit printed board are fixedly connected through screws.
Furthermore, a conical opening is formed in one side, close to the elastic membrane, of the through hole of the filler pipe nozzle.
Furthermore, the cable outlet is bundled by adopting a silicone tube, and the cable outlet is singly bundled and reinforced by adopting the silicone tube to prevent abrasion.
The invention has the beneficial effects that:
1. the sensor has excellent performance and high reliability, and solves the pressure measurement problem under the conditions of large overload, strong vibration and complex electromagnetic environment; the unique design of the thickened diaphragm is adopted, the overload capacity is strong, the 200 percent F.S overload performance is unchanged, and the 300 percent F.S overload is not leaked; and the anti-interference capability is enhanced through the design of all-metal shielding.
2. The elastic diaphragm is designed into a variable-thickness diaphragm, the upper surface of the diaphragm is a plane and is used for pasting the strain gauge, and the lower surface of the diaphragm is in a smooth transition curved surface form, so that the tangential strain at the center of the diaphragm and the radial strain at the edge are uniformly distributed, and the measurement precision is improved; meanwhile, the thickness of the edge of the diaphragm is thickened, stress concentration is avoided, and therefore the overload capacity of the sensor is improved.
3. The sensitive element of the sensor is connected with the electric connector through the cable, and a split structure is adopted, so that the electric connection failure fault caused by insufficient self vibration resistance of the electric connector is avoided, and the vibration resistance and impact resistance of the sensor can be enhanced.
4. The sensor has split design and a special reinforcement technology, has strong vibration resistance and impact resistance, has the vibration resistance magnitude of more than 100Grms, meets the development requirement of a new generation of liquid oxygen kerosene engine, can be popularized to the fields of aviation, navigation, automobiles and the like, and has wide application prospect.
Drawings
FIG. 1 is a structural diagram of a large overload high-precision strain type pressure sensor according to an embodiment of the invention;
FIG. 2 is a diagram of a sensor structure according to an embodiment of the present invention;
FIG. 3 is a graph of the strain profile of a diaphragm according to the present invention;
FIG. 4 is a block diagram of a shielding assembly according to an embodiment of the present invention.
Reference numerals: the method comprises the following steps of 1-a sensitive element, 2-a shielding assembly, 3-a filler neck, 4-a casing nut, 5-a shell, 6-a cable, 7-an electric connector, 8-silicon rubber, 9-epoxy glue, 11-an elastic membrane, 12-a strain gage, 13-a compensation circuit printed board, 21-a cable fixing seat, 22-a pressure ring and 23-a shielding layer.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the large-overload high-precision strain type pressure sensor shown in fig. 1 to 4 comprises a sensitive element 1, a shielding component 2, a filler neck 3, a casing nut 4, a shell 5, a cable 6, an electric connector 7, silicon rubber 8 and epoxy glue 9; the epoxy glue 9, the silicon rubber 8 and the sensitive element 1 are sequentially arranged inside the shell 5; the sensitive element 1 comprises an elastic diaphragm 11, a strain gauge 12 and a compensation circuit printed board 13, wherein the elastic diaphragm 11 is a variable thickness diaphragm, the upper surface of the elastic diaphragm 11 is provided with an upper groove, the lower surface of the elastic diaphragm is provided with a lower groove, the bottom surface of the upper groove is a plane, the bottom surface of the lower groove is a smooth transition curved surface, the curved surface ensures that the tangential strain at the center of the diaphragm and the radial strain at the edge are uniformly distributed, the strain gauge 12 forming a Wheatstone full bridge is pasted on the bottom surface of the groove on the elastic diaphragm 11, the elastic diaphragm 11 senses the pressure of a medium to generate strain, and the resistance value changes after sensing the strain, thereby realizing the measurement of a pressure parameter, a lead of the strain gauge 12 is connected to the compensation circuit printed board 13, the compensation circuit printed board 13 is connected with a cable 6 to carry out signal transmission, the elastic diaphragm 11 and the compensation circuit printed, The shielding component 2 is connected with the electric connector 7 to realize the transmission of electric signals; the shielding assembly 2 is arranged at the joint of the shell 5 and the cable 6 and comprises a cable fixing seat 21, pressing rings 22 and a shielding layer 23, the cable fixing seat 21 is fixedly connected with the shell 5, one end of the shielding layer 23 is provided with an outer side boss, the pressing rings 22 are arranged at two ends of the boss, the shielding layer 23 is arranged at the bottom of the inner side of the cable fixing seat 21 through the two pressing rings 22, and the other end of the shielding layer is fixedly connected with the electric connector 7; the filler neck 3 is fixedly arranged on one side of the shell 5 and is fixedly connected with the elastic diaphragm 11, a through hole is formed in the middle of the filler neck 3, a conical opening is formed in one side, close to the elastic diaphragm 11, of the through hole of the filler neck 3, and a sleeve nut 4 is fixedly arranged on the outer side of the filler neck 3.
The electrical signal connections are: the sensitive element strain gauge 12 is connected to the compensation circuit printed board 13 through a lead, and two ends of the cable 6 are respectively connected with the compensation circuit printed board 13 and the electric connector 7, so that input and output of electric signals are realized.
The sensor shell and the cable fixing seat 21 are made of metal, the shielding component 2, the shell 5, the electric connector 7 and the like are connected into a whole in a laser welding mode and the like, the strain gauge 12, the compensation circuit printed board 13, the cable 6 and the like are completely wrapped, and 360-degree full-metal shielding is achieved. The sensing element 1 and the electric connector 7 are connected through the cable 6, a split structure is adopted, the electric connection failure fault caused by insufficient vibration resistance of the electric connector 7 is avoided, and the vibration resistance and impact resistance of the sensor can be enhanced.
The sensitive element 1 of the large-overload high-precision strain type pressure sensor is the core of the sensor and is used for sensing medium pressure and converting a pressure signal into a voltage signal; the local parts of the strain gauge 12 lead welding spots, the compensation circuit welding spots and the like are reinforced by adopting 8 silicone rubber adhesive, the whole sensor is encapsulated by adopting 9 epoxy adhesive, and the outlet of the cable 6 is separately bundled and reinforced by adopting a silicone tube to prevent abrasion.
The elastic diaphragm 11 is made of high-quality stainless steel, and is designed into a variable-thickness diaphragm according to stress-strain distribution after medium pressure action, the upper surface of the diaphragm is a plane and is used for sticking the strain gauge 12, and the lower surface of the diaphragm is in a smooth transition curved surface form, so that tangential strain at the center of the diaphragm and radial strain at the edge are uniformly distributed, and the measurement precision is improved; meanwhile, the thickness of the edge of the diaphragm is thickened, stress concentration is avoided, and therefore the overload capacity of the sensor is improved. The compensation circuit is mainly used for zero point compensation of the sensor and temperature compensation of zero point and sensitivity, so that the zero point output consistency of the sensor is ensured, and measurement errors at different temperatures are reduced.
The basic principle of medium pressure measurement is as follows: the strain gauge 12 forming the Wheatstone full bridge is adhered to the surface of the elastic diaphragm 11, and as the diaphragm deforms under the pressure of a medium, the sensitive grid of the strain resistor obtains the same deformation, so that the resistance of the strain resistor changes; the change of the resistance is linearly proportional to the measured pressure, namely the output signal of the electric bridge is proportional to the measured pressure, thereby realizing the measurement of the pressure parameter.
The invention designs a unique thickened diaphragm, and the overload capacity of the diaphragm is 2-3 times that of a common diaphragm; the sensor adopts 360-degree full-metal shielding structure design, split design and a special reinforcing technology, so that the anti-interference, vibration-resistant and impact-resistant capabilities of the sensor meet the requirements.
Claims (6)
1. The utility model provides a big high accuracy strain gauge pressure sensor that transships which characterized in that: the cable connector comprises a sensitive element (1), a shielding component (2), a filler neck (3), a shell (5), a cable (6), an electric connector (7), silicon rubber (8) and epoxy glue (9);
the epoxy glue (9), the silicon rubber (8) and the sensitive element (1) are sequentially arranged in the shell (5);
the sensitive element (1) comprises an elastic diaphragm (11), a strain gauge (12) and a compensation circuit printed board (13), wherein the elastic diaphragm (11) is a variable-thickness diaphragm, an upper groove is formed in the upper surface of the elastic diaphragm (11), a lower groove is formed in the lower surface of the elastic diaphragm (11), the bottom surface of the upper groove is a plane, the bottom surface of the lower groove is a smooth transition curved surface, the curved surface ensures that tangential strain at the center of the diaphragm and radial strain at the edge of the diaphragm are uniformly distributed, the strain gauge (12) forming a Wheatstone full bridge is adhered to the bottom surface of the upper groove of the elastic diaphragm (11), a lead of the strain gauge (12) is connected to the compensation circuit printed board (13), the compensation circuit printed board (13) is connected with a cable (6) for signal transmission, and the cable (6) sequentially penetrates through silicon rubber (8), epoxy glue (9) and a shielding;
the shielding assembly (2) is arranged at the joint of the shell (5) and the cable (6) and comprises a cable fixing seat (21) and a shielding layer (23); the cable fixing seat (21) is fixedly connected with the shell (5), one end of the shielding layer (23) is arranged at the bottom of the inner side of the cable fixing seat (21), the other end of the shielding layer is fixedly connected with the electric connector (7), and the shell (5) and the cable fixing seat (21) are made of metal;
the filler neck (3) is fixedly arranged on one side of the shell (5) and is fixedly connected with the elastic membrane (11), and a through hole is formed in the middle of the filler neck (3);
the shielding component (2), the shell (5) and the electric connector (7) are connected into a whole in a laser welding mode;
the one end of shielding layer (23) is provided with the outside boss, the both ends of boss are provided with clamping ring (22), shielding layer (23) set up in cable fixing base (21) inboard bottom through two clamping ring (22).
2. A large overload high accuracy strain gauge pressure sensor as claimed in claim 1 wherein: and an outer sleeve nut (4) is fixedly arranged on the outer side of the filler neck (3).
3. A large overload high accuracy strain gauge pressure sensor as claimed in claim 2 wherein: the elastic diaphragm (11) is made of stainless steel.
4. A large overload high accuracy strain gauge pressure sensor as claimed in claim 3 wherein: the elastic diaphragm (11) and the compensation circuit printed board (13) are fixedly connected through screws.
5. A large overload high accuracy strain gauge pressure sensor as claimed in claim 4, wherein: and a conical opening is formed in one side, close to the elastic membrane (11), of the through hole of the filler pipe nozzle (3).
6. A large overload high accuracy strain gauge pressure sensor as claimed in claim 5 wherein: and the outlet of the cable (6) is bundled by a silicone tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810146529.2A CN108267258B (en) | 2018-02-12 | 2018-02-12 | Large-overload high-precision strain type pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810146529.2A CN108267258B (en) | 2018-02-12 | 2018-02-12 | Large-overload high-precision strain type pressure sensor |
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| Publication Number | Publication Date |
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| CN108267258A CN108267258A (en) | 2018-07-10 |
| CN108267258B true CN108267258B (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810146529.2A Active CN108267258B (en) | 2018-02-12 | 2018-02-12 | Large-overload high-precision strain type pressure sensor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2755581Y (en) * | 2004-12-08 | 2006-02-01 | 徐兴才 | Ceramic pressure sensor with high overload performance |
| CN201173834Y (en) * | 2008-01-31 | 2008-12-31 | 南京高华科技有限公司 | Small volume high over load all-noncorrodible steel oil-charging structural pressure sensor |
| CN201707167U (en) * | 2010-05-18 | 2011-01-12 | 北京遥测技术研究所 | Ultralow-temperature diaphragm pressure/temperature compound sensor |
| CN103487178A (en) * | 2013-09-16 | 2014-01-01 | 沈阳仪表科学研究院有限公司 | High-power overload 1KPa silicon micropressure sensor chip and manufacturing method |
| CN106996846A (en) * | 2016-01-25 | 2017-08-01 | 上海朝辉压力仪器有限公司 | Diaphragm type digital pressure gauge |
-
2018
- 2018-02-12 CN CN201810146529.2A patent/CN108267258B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2755581Y (en) * | 2004-12-08 | 2006-02-01 | 徐兴才 | Ceramic pressure sensor with high overload performance |
| CN201173834Y (en) * | 2008-01-31 | 2008-12-31 | 南京高华科技有限公司 | Small volume high over load all-noncorrodible steel oil-charging structural pressure sensor |
| CN201707167U (en) * | 2010-05-18 | 2011-01-12 | 北京遥测技术研究所 | Ultralow-temperature diaphragm pressure/temperature compound sensor |
| CN103487178A (en) * | 2013-09-16 | 2014-01-01 | 沈阳仪表科学研究院有限公司 | High-power overload 1KPa silicon micropressure sensor chip and manufacturing method |
| CN106996846A (en) * | 2016-01-25 | 2017-08-01 | 上海朝辉压力仪器有限公司 | Diaphragm type digital pressure gauge |
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| CN108267258A (en) | 2018-07-10 |
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