CN217032821U - Hydrodynamic external pressure sensor - Google Patents
Hydrodynamic external pressure sensor Download PDFInfo
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- CN217032821U CN217032821U CN202122970920.4U CN202122970920U CN217032821U CN 217032821 U CN217032821 U CN 217032821U CN 202122970920 U CN202122970920 U CN 202122970920U CN 217032821 U CN217032821 U CN 217032821U
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Abstract
The utility model discloses a hydrodynamic external pressure sensor, which comprises: the device comprises an upper cover, a signal conditioning plate, a shell, a sensitive core, a buffer sheet, a pressure interface seat, a cable and an electric connector; the sensitive core body is positioned in a groove at one end of the pressure interface seat, the buffer sheet is arranged at the bottom of the groove, and the horn-shaped pressure leading hole is arranged at the other end of the pressure interface seat and is communicated with the groove; the signal conditioning board is arranged in an installation cavity formed by the shell, the upper cover and the pressure interface seat and is electrically connected with the sensitive core body, and pouring sealant is filled in the installation cavity; the signal conditioning board is electrically connected with the electric connector outside the shell through a cable; one end of the pressure interface seat where the pressure leading hole is located is installed on the elastic body and is communicated with a water environment, and the electric connector is connected with the system data acquisition device; the underwater bullet type underwater bullet protector can normally work underwater, can resist a large amount of impact force and air cushion effect instantaneously generated when a bullet falls into water at high altitude, and is not easy to damage.
Description
Technical Field
The utility model belongs to the technical field of sensors, and particularly relates to a hydrodynamic external pressure sensor.
Background
When a ship operates on the sea, after the projectile falls into water, the sensor is arranged in the middle of the length direction of the projectile to measure the water pressure around the projectile, but when the traditional pressure sensor measures the water pressure underwater, water can flow back into the sensor, so that the circuit of the sensor is damaged, and the normal operation cannot be realized; moreover, the traditional pressure sensor cannot resist a large-scale impact force of the elastomer in the falling process and an air cushion effect instantaneously generated by the elastomer falling into the water at high altitude, so that a sensitive core of the sensor is damaged, and the performance of the sensor is seriously deteriorated to be completely ineffective.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model provides a hydrodynamic external pressure sensor, which not only can normally work underwater, but also can normally measure water pressure under the conditions of enduring a large number of impact forces and an air cushion effect instantaneously generated when a projectile falls into water at high altitude, and has the characteristics of high precision, fast frequency response and seawater corrosion resistance.
The utility model is realized by the following technical scheme:
a hydrodynamic external pressure sensor comprising: the device comprises an upper cover, a signal conditioning plate, a shell, a sensitive core, a buffer sheet, a pressure interface seat, a cable and an electric connector;
the shell is of a shell structure with openings at two ends;
a groove is formed in one end of the pressure interface seat, a cylindrical boss is formed in the other end of the pressure interface seat, a pressure guiding through hole is formed in the central axis of the boss, and the pressure guiding through hole is communicated with the groove;
one end of the shell is fixedly connected with the pressure interface seat, and the other end of the shell is fixedly provided with the upper cover, so that an installation cavity is formed among the shell, the upper cover and the pressure interface seat;
the signal conditioning board is arranged in the installation cavity and is electrically connected with an electric connector positioned outside the installation cavity through a cable, and the electric connector is electrically connected with an external system data acquisition device;
the sensitive core is arranged in a groove of the pressure interface seat and is electrically connected with the signal conditioning plate;
the surface of the buffer sheet is uniformly distributed with more than two small holes, and the buffer sheet is arranged at the bottom of the groove of the pressure interface seat, namely between the sensitive core body and the pressure leading through hole.
Furthermore, the pressure guiding through hole comprises a cylindrical hole and a flared hole, a closing-in port is arranged on the cylindrical hole, and the small-diameter end of the flared hole is intersected with the cylindrical hole.
Furthermore, a flange is processed at one end of the pressure interface seat where the boss is located; the pressure interface seat is fixedly arranged in the middle of the projectile body in the length direction through a flange;
the outer circumference of the boss of the pressure interface seat is provided with external threads, the outer wall of the projectile body is provided with a through hole with internal threads, and the boss of the pressure interface seat is connected with the outer wall of the projectile body through threads.
Further, the buffer sheet is a circular thin sheet.
Furthermore, pouring sealant is filled in the installation cavity.
Further, the sensitive core body is a silicon piezoresistive sensitive core body.
Furthermore, the pouring sealant is organic silicon gel.
Furthermore, the upper cover and the shell, the sensitive core and the pressure interface seat and the shell and the pressure interface seat are fixedly connected in a laser welding mode.
Further, the buffer sheet is made of polytetrafluoroethylene SFB-1, and the thickness of the buffer sheet is 2 mm; the pressure interface seat, the shell and the upper cover are all made of 05Cr17Ni4Cu4Nb high-elasticity stainless steel; the sensitive core is made of 316L stainless steel; the electric connector is a standard interface socket.
Has the beneficial effects that:
(1) the pressure interface seat is provided with the pressure leading through hole, water can enter the sensor through the pressure leading through hole to carry out pressure measurement, and the pressure leading through hole plays roles of butting with a user pipeline interface, leading pressure and protecting a pressure sensitive core body; in addition, the pressure guiding through holes are designed in a horn-shaped hole, and meanwhile, a closing-in design is arranged on a cylindrical hole connected with the horn-shaped hole, so that when the sensor falls into water, water flow is rapidly reduced, the impact force of the water flow on the sensitive core is relieved, the effect of protecting the sensitive core is achieved, and the sensitive core cannot be damaged.
(2) The buffer sheet with more than two small holes on the surface is arranged between the sensitive core body and the pressure guiding through hole, and disperses water flow through more than two small holes of the buffer sheet so as to relieve the impact force of water columns on a pressure diaphragm of the sensitive core body of the sensor when the sensor falls into water from high altitude and the air cushion effect instantaneously generated by the falling water, thereby protecting the sensitive core body of the sensor and preventing the pressure diaphragm in the sensitive core body from being damaged to influence the performance of the sensor.
(3) The utility model adopts an inner cavity watertight potting process, namely, potting adhesive is filled in an installation cavity formed among the shell, the upper cover and the pressure interface seat, and the installation cavity is sealed by the potting adhesive; the pouring sealant adopts the organic silicon gel, the organic silicon gel has good sealing performance, is firmly bonded with the wall surface, has no generation of gaps, air holes and the like, has small stress, does not generate stress action on components and shortens the service life of the components.
(4) The silicon piezoresistive pressure sensitive core body has the advantages of high sensitivity, high measurement precision, high dynamic frequency response, stable performance and the like, and the silicon oil in the silicon piezoresistive pressure sensitive core body is used as a pressure conducting medium and also plays a role in protecting a chip in the sensitive core body.
(5) The shell of the utility model has the function of protecting the circuit conditioning board in the sensor, and the upper cover has the function of fixing the cable.
(6) The utility model has overload capacity of more than 200 percent and total precision of less than 0.5 percent (including linearity, hysteresis and repetition), can bear large-magnitude impact of over 12000g for normal work, can be soaked in seawater for more than 2 hours, and can work normally under the depth of 150m of seawater.
Drawings
FIG. 1 is a schematic view of a pressure sensor according to the present invention;
FIG. 2 is a view showing a structure of a buffer sheet;
FIG. 3 is a schematic view of a pressure interface mount;
the device comprises a base, a shell, a signal conditioning plate, a shell, a sensitive core, a buffer sheet, a pressure interface seat, a cable, an electric connector and a pressure lead through hole, wherein the base comprises 1-an upper cover, 2-the signal conditioning plate, 3-the shell, 4-the sensitive core, 5-the buffer sheet, 6-the pressure interface seat, 7-the cable, 8-the electric connector and 9-the pressure lead through hole.
Detailed Description
The utility model is described in detail below by way of example with reference to the accompanying drawings.
This embodiment provides a hydrodynamic external pressure sensor, see fig. 1 and 3, comprising: the device comprises an upper cover 1, a signal conditioning board 2, a shell 3, a sensitive core 4, a buffer sheet 5, a pressure interface seat 6, a cable 7 and an electric connector 8;
referring to fig. 1, the housing 3 is a cylindrical shell structure with two open ends;
the pressure interface seat 6 is of a cylindrical structure, one end of the cylindrical structure is provided with a groove, the other end of the cylindrical structure is provided with a flange, the center of the end face of the flange is provided with a boss, the outer circumferential surface of the boss is provided with external threads, and the external threads are designed by adopting the conventional M12 multiplied by 1.25-6 h; a pressure guiding through hole 9 is processed on the central axis of the boss, and the pressure guiding through hole 9 is communicated with the groove; referring to fig. 3 and fig. 1, the pressure guiding through hole 9 is composed of a cylindrical hole and a flared hole, and a closing-in is arranged on the cylindrical hole; the horn-shaped hole is provided with a small-diameter end and a large-diameter end, and the small-diameter end is intersected with the cylindrical hole;
referring to the attached drawing 2, the buffer sheet 5 is a circular sheet, and more than two small holes are uniformly distributed on the surface of the circular sheet;
the connection mode of each part is as follows:
the pressure interface seat 6 is fixedly arranged in the middle of the projectile body in the length direction through a flange, a through hole with internal threads is formed in the outer wall of the projectile body, and external threads on a boss of the pressure interface seat 6 are matched with the internal threads of the through hole in the outer wall of the projectile body, so that the pressure through hole 9 is communicated with a water environment around the projectile body;
referring to fig. 1, the sensitive core 4 is fixedly installed in a groove of the pressure interface seat 6; the buffer sheet 5 is arranged at the bottom of the groove of the pressure interface seat 6, namely between the sensitive core 4 and the pressure guiding through hole 9, and is used for dispersing water flow flowing in from the pressure guiding through hole 9, and slowing down the air cushion effect instantaneously generated by the water pressure external pressure sensor from high altitude falling water and a large amount of impact force of a water column on a pressure diaphragm of the sensitive core 4, so that the pressure diaphragm is prevented from being damaged, the sensitive core 4 is prevented from being damaged, and the performance of the sensor is influenced;
one end of the shell 3 is fixedly connected with the end where the groove of the pressure interface seat 6 is located, and the other end is fixedly provided with the upper cover 1, so that an installation cavity is formed among the shell 3, the upper cover 1 and the pressure interface seat 6;
the signal conditioning board 2 is fixed in the mounting cavity and is electrically connected with the sensitive core 4, and a gap of 10mm is reserved between the board surface of the signal conditioning board 2 and the end surface of the shell 3 where the upper cover 1 is located; the installation cavity is filled with pouring sealant, so that water is prevented from entering the sensor, and the sensor can normally work underwater; the pouring sealant is organic silicon gel which has good sealing performance, is firmly bonded with the wall surface, has no gap, air hole and the like, has small stress, does not produce stress action on components, does not shorten the service life of the components, can effectively prevent water from entering the interior of the sensor, and ensures that the sensor normally works underwater.
The signal conditioning board 2 is connected with an electric connector 8 through a cable 7, the electric connector 8 is installed on the upper cover 1 and is positioned outside the installation cavity, the electric connector 8 is connected with an external system data acquisition device, and the system data acquisition device can supply power for the sensor and receive signals output by the signal conditioning board 2;
the upper cover 1 and the shell 3, the sensitive core 4 and the pressure interface seat 6 and the shell 3 and the pressure interface seat 6 are fixedly connected in a laser welding mode;
the sensitive core body 4 is a silicon piezoresistive sensitive core body and is made of 316L stainless steel;
the thickness of the buffer sheet 5 is 2mm, and the material is polytetrafluoroethylene SFB-1;
the materials of the pressure interface seat 6, the shell 3 and the upper cover 1 are all 05Cr17Ni4Cu4Nb high-elasticity stainless steel;
the electric connector 8 is a standard interface socket, the type is Y8B-4ZJLM, and the installation and the use are convenient.
The working principle is as follows:
the utility model relates to an electromechanical integrated pressure sensor.A measured medium (the measured medium in the embodiment is water) enters the sensor through a pressure guiding through hole 9, a sensitive core body 4 in the sensor senses the pressure of the medium and outputs a measurement signal to a signal conditioning plate 2, the signal conditioning plate 2 performs temperature compensation and amplification processing on the signal and transmits the processed signal to a system data acquisition device through a cable 7 and an electric connector 8, the system data acquisition device reads an analog signal according to a set linear equation to acquire a pressure value, and the pressure value is the pressure of the measured medium;
wherein, the sensitive core body 4 adopts silicon piezoresistive technology, including: the pressure diaphragm is used for sensing medium pressure, transmitting the pressure to silicon oil and then transmitting the silicon oil to the silicon piezoresistive chip, the resistivity of the silicon cup changes under the action of the pressure, so that the resistance value of each bridge arm of an electric bridge on the silicon cup changes, a circuit is used for detecting the change, the output of the electric bridge is compensated by the compensating circuit board in zero position, sensitivity and the like, and a millivolt voltage signal, namely a standard measuring signal corresponding to the pressure, is output under the condition of constant voltage power supply, and is in direct proportion to the external pressure.
The signal conditioning board 2 performs temperature compensation and signal conditioning and amplification on the signal output by the sensitive core 4, and simultaneously adjusts the dynamic response frequency of the sensor, so that the dynamic response frequency outputs a 0V-5V voltage signal meeting the frequency response requirement.
The operation steps are as follows:
firstly, a pressure sensor is installed and fixed on a projectile body through external threads (M12 multiplied by 1.25-6h) on a flange and a boss of a pressure interface seat 6;
secondly, docking the electrical connector 8 (model number Y8B-4ZJLM) using a corresponding electrical connector plug (model number Y8B-4TK) to power and connect the sensor to the system data acquisition device;
thirdly, acquiring an output signal of the sensor under normal pressure, wherein the acquired data is a zero point of the sensor, and the corresponding pressure of the zero point is 0.1 MPa;
and fourthly, the measured medium enters the inner cavity of the sensor through the pressure leading through hole 9, the electric bridge outputs millivolt voltage signals after the sensitive core body 4 is deformed, and the voltage signals are subjected to temperature compensation and amplification processing through the signal conditioning plate 2 and finally output 0V-5V analog voltage signals. The analog voltage signal is transmitted to the system data acquisition device through the cable 7 and the electric connector 8, the system data acquisition device reads the analog signal according to a set linear equation to obtain a pressure value, and the pressure value is the pressure of the measured medium.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A hydrodynamic external pressure sensor, comprising: the device comprises an upper cover (1), a signal conditioning board (2), a shell (3), a sensitive core body (4), a buffer sheet (5), a pressure interface seat (6), a cable (7) and an electric connector (8);
the shell (3) is of a shell structure with openings at two ends;
a groove is processed at one end of the pressure interface seat (6), a cylindrical boss is processed at the other end of the pressure interface seat, a pressure guiding through hole (9) is processed on the central axis of the boss, and the pressure guiding through hole (9) is communicated with the groove;
one end of the shell (3) is fixedly connected with the pressure interface seat (6), and the other end of the shell is fixedly provided with the upper cover (1), so that an installation cavity is formed among the shell (3), the upper cover (1) and the pressure interface seat (6);
the signal conditioning board (2) is arranged in the installation cavity and is electrically connected with an electric connector (8) positioned outside the installation cavity through a cable (7), and the electric connector (8) is electrically connected with an external system data acquisition device;
the sensitive core body (4) is arranged in a groove of the pressure interface seat (6) and is electrically connected with the signal conditioning plate (2);
more than two small holes are uniformly distributed on the surface of the buffer sheet (5), and the buffer sheet (5) is arranged at the bottom of a groove of the pressure interface seat (6), namely between the sensitive core body (4) and the pressure leading through hole (9).
2. A hydrodynamic external pressure sensor according to claim 1 characterized in that said pressure-inducing through-hole (9) comprises a cylindrical hole and a flared hole, said cylindrical hole being provided with a closing-in, the small-diameter end of said flared hole meeting said cylindrical hole.
3. The hydrodynamic external pressure sensor according to claim 1 or 2, characterized in that a flange is further processed at one end of the pressure interface seat (6) where the boss is located; the pressure interface seat (6) is fixedly arranged in the middle of the elastomer in the length direction through a flange;
the outer circumference of the boss of the pressure interface seat (6) is provided with external threads, the outer wall of the projectile body is provided with a through hole with internal threads, and the boss of the pressure interface seat (6) is connected with the outer wall of the projectile body through threads.
4. A hydrodynamic external pressure sensor according to claim 1, wherein said buffer sheet (5) is a circular thin sheet.
5. The hydrodynamic external pressure sensor as claimed in claim 1, wherein the installation cavity is filled with a potting adhesive.
6. A water pressure external sensor according to claim 1 wherein said sensitive core (4) is a silicon piezoresistive sensitive core.
7. The hydrodynamic external pressure sensor as claimed in claim 5, wherein the pouring sealant is silicone gel.
8. The hydrodynamic external pressure sensor according to claim 1, wherein the upper cover (1) and the outer shell (3), the sensitive core (4) and the pressure interface seat (6), and the outer shell (3) and the pressure interface seat (6) are all fixedly connected by laser welding.
9. The external hydraulic pressure sensor according to claim 1, wherein the buffering sheet (5) is made of polytetrafluoroethylene SFB-1 with a thickness of 2 mm; the pressure interface seat (6), the shell (3) and the upper cover (1) are all made of 05Cr17Ni4Cu4Nb high-elasticity stainless steel; the sensitive core body (4) is made of 316L stainless steel; the electric connector (8) is a standard interface socket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122970920.4U CN217032821U (en) | 2021-11-30 | 2021-11-30 | Hydrodynamic external pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122970920.4U CN217032821U (en) | 2021-11-30 | 2021-11-30 | Hydrodynamic external pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217032821U true CN217032821U (en) | 2022-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122970920.4U Active CN217032821U (en) | 2021-11-30 | 2021-11-30 | Hydrodynamic external pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217032821U (en) |
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2021
- 2021-11-30 CN CN202122970920.4U patent/CN217032821U/en active Active
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