CN114777992A - Pressure scanning valve - Google Patents
Pressure scanning valve Download PDFInfo
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- CN114777992A CN114777992A CN202210694565.9A CN202210694565A CN114777992A CN 114777992 A CN114777992 A CN 114777992A CN 202210694565 A CN202210694565 A CN 202210694565A CN 114777992 A CN114777992 A CN 114777992A
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- pressure
- guide needle
- air guide
- needle nozzle
- assembly
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
- G01L19/148—Details about the circuit board integration, e.g. integrated with the diaphragm surface or encapsulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
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- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a pressure scanning valve, which comprises a shell, a cover plate assembly, a pressure sensing assembly and a control assembly, wherein the pressure sensing assembly is used for acquiring pressure information; the pressure sensing assembly comprises a plurality of pressure-sensitive chips, a gas guide needle nozzle assembly and a gas chamber, and the pressure-sensitive chips and the control assembly are arranged in the shell; the air guide needle nozzle assembly comprises a reference pressure air guide needle nozzle and a plurality of test pressure air guide needle nozzles; the control assembly at least comprises a first PCB, and channel interfaces of the reference pressure and gas guide needle nozzle and the plurality of test pressure and gas guide needle nozzles are sealed on the first PCB. According to the pressure scanning valve provided by the invention, the interfaces of the test pressure channel and the reference pressure channel are sealed in the same plane, namely on the first PCB, so that the space is saved, the pressure scanning valve is convenient to install in model pneumatic measurement, and the pneumatic test is convenient to carry out.
Description
Technical Field
The invention relates to the field of pressure monitoring equipment, in particular to a pressure scanning valve.
Background
In recent years, the pressure scanning valve is widely applied as a novel testing device, and is mainly applied to pressure-related testing systems such as aircraft online testing, wind tunnel testing, flight testing, engine testing, wind and sand environment testing, automobile simulation testing and the like.
In the prior art, the commonly used pressure scanning valve generally has the defects of large product volume, more accessories, inconvenient installation, low scanning speed and the like, so that the pressure scanning efficiency is low, the time is wasted, and the accuracy is required to be improved.
Therefore, how to reduce the volume of the pressure scanning valve and improve the installation convenience is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a pressure scanning valve which is high in integration level, small in size and accurate in positioning.
In order to achieve the purpose, the invention provides the following technical scheme:
a pressure scanning valve comprises a shell, a cover plate assembly, a pressure sensing assembly and a control assembly, wherein the pressure sensing assembly is used for acquiring pressure information, the control assembly is used for processing the pressure information acquired by the pressure sensing assembly, and the shell is connected with the cover plate assembly in a sealing mode; the pressure sensing assembly comprises a plurality of pressure sensitive chips, a gas guide needle nozzle assembly and a gas chamber, and the pressure sensitive chips and the control assembly are arranged in the shell; the air guide needle nozzle assembly comprises a reference pressure air guide needle nozzle and a plurality of test pressure air guide needle nozzles; the control assembly at least comprises a first PCB, and the channel interfaces of the reference pressure and air guide needle nozzle and the plurality of test pressure and air guide needle nozzles are sealed on the first PCB.
Preferably, the pressure measurement and test air guide needle nozzles are uniformly arranged in a linear mode and communicated to the same reference air pressure end.
Preferably, the air guide needle nozzle assembly further comprises a base which can be installed on the shell, and the reference air guide needle nozzle and the test air guide needle nozzle are both arranged on the base; the air guide needle nozzle assembly is detachably and hermetically arranged on the cover plate assembly; the base is also provided with a base reference pressure air inlet through hole and a plurality of base test pressure air inlet through holes; the pressure measurement and test air guide needle nozzle, the reference pressure air guide needle nozzle, the base reference pressure air inlet through hole and the base pressure measurement and test air inlet through hole are all processed by a high-frequency longitudinal-torsional composite ultrasonic vibration punching method.
Preferably, the cover plate assembly comprises a cover plate body, and a cover plate test pressure air inlet through hole, a cover plate reference pressure air inlet through hole and a first mounting hole are formed in the cover plate body; the air guide needle nozzle assembly is detachably inserted into the first mounting hole, and the reference pressure air guide needle nozzle and each test pressure air guide needle nozzle of the air guide needle nozzle assembly are sealed with the cover plate body through first sealing rings.
Preferably, the control assembly further comprises a second PCB and a flexible connecting board connected between the first PCB and the second PCB; the cover plate body is sealed with the first PCB through a second sealing ring.
Preferably, a communication interface is arranged on the second PCB, and a jack corresponding to the communication interface is arranged on the shell.
Preferably, the pressure-sensitive chip and the air pressure chamber are glued and welded on the control assembly, the pressure-sensitive chip is sealed inside the air pressure chamber, and the air pressure chamber provides a common reference pressure for the pressure-sensitive chip.
Preferably, the test pressure gas guide needle nozzle, the reference pressure gas guide needle nozzle and the air pressure chamber are all aluminum alloy pieces.
Preferably, the pressure-sensitive chip is a differential pressure type MEMS pressure sensor.
Preferably, the cover plate assembly further comprises a sealing plate, the sealing plate is connected with the cover plate in a sealing mode to form a closed space, and the air pressure chamber is located in the closed space.
The pressure scanning valve provided by the invention comprises a shell, a cover plate assembly, a pressure sensing assembly and a control assembly, wherein the pressure sensing assembly is used for acquiring pressure information; the pressure sensing assembly comprises a plurality of pressure-sensitive chips, an air guide needle nozzle assembly and an air pressure chamber, and the pressure-sensitive chips and the control assembly are arranged in the shell; the air guide needle nozzle assembly comprises a reference pressure air guide needle nozzle and a plurality of test pressure air guide needle nozzles; the control assembly at least comprises a first PCB, and channel interfaces of the reference pressure and gas guide needle nozzle and the plurality of test pressure and gas guide needle nozzles are sealed on the first PCB. According to the pressure scanning valve provided by the invention, the interfaces of the test pressure channel and the reference pressure channel are sealed in the same plane, namely on the first PCB, so that the situation that air nozzles need to be introduced around the final pressure scanning valve is avoided, the space is saved, the pressure scanning valve is convenient to install in model pneumatic measurement, and the pneumatic test is convenient to carry out.
In a preferred embodiment, the cover plate assembly further comprises a sealing plate, the sealing plate and the cover plate are connected in a sealing mode to form a closed space, and the air pressure chamber is located in the closed space. According to the arrangement, the cover plate provides secondary sealing for the reference pressure through the sealing plate, the air pressure chamber is sealed in the closed space formed by the cover plate and the sealing plate, and the reliability is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a pressure scanning valve according to one embodiment of the present invention;
FIG. 2 is a schematic structural view of the air guide needle nozzle assembly of the pressure scanning valve of FIG. 1;
FIG. 3 is a front view of the air guide needle nozzle assembly of the pressure scanning valve of FIG. 1;
FIG. 4 is a top view of the air guide needle nozzle assembly of the pressure scanning valve of FIG. 1;
FIG. 5 is a bottom view of the air guide needle nozzle assembly of the pressure sweep valve of FIG. 1;
FIG. 6 is a front cross-sectional view of the pressure scanning valve shown in FIG. 1;
FIG. 7 is a top view of the pressure sweep valve shown in FIG. 1;
FIG. 8 is a schematic diagram of a control assembly of the pressure sweep valve of FIG. 1;
FIG. 9 is a schematic diagram of a front side of a first PCB of the pressure scan valve of FIG. 1;
FIG. 10 is a schematic diagram of a back side structure of a first PCB board of the pressure scan valve of FIG. 1;
wherein: a housing 1; a cover plate component 2; a cover plate pressure measurement and test air inlet through hole 21; the cover reference pressure intake through hole 22; a first seal ring 23; a second seal ring 24; the first mounting hole 25; a second mounting hole 26; a sealing plate 27; a control assembly 3; a first PCB board 31; the first PCB board test pressure inlet hole 311; a first PCB reference pressure inlet via 312; a flexible connection plate 32; a second PCB board 33; a USB interface 331; a pressure sensing component 4; a pressure-sensitive chip 41; an air guide needle nozzle assembly 42; testing the air-pressing needle nozzle 421; a reference pressure air guide needle nozzle 422; a base mounting through hole 423; a base 424; a fastener 425; an air pressure chamber 43; and a copper pillar 5.
Detailed Description
The core of the invention is to provide the pressure scanning valve which has high integration level, small volume and accurate positioning.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 10, fig. 1 is a schematic structural diagram of an embodiment of a pressure scanning valve provided in the present invention; FIG. 2 is a schematic structural view of the air guide needle nozzle assembly of the pressure scanning valve of FIG. 1; FIG. 3 is a front view of the air guide needle nozzle assembly of the pressure scanning valve of FIG. 1; FIG. 4 is a top view of the air guide needle nozzle assembly of the pressure scanning valve of FIG. 1; FIG. 5 is a bottom view of the air guide needle nozzle assembly of the pressure scanning valve of FIG. 1; FIG. 6 is a front cross-sectional view of the pressure scanning valve shown in FIG. 1; FIG. 7 is a top view of the pressure scanning valve of FIG. 1; FIG. 8 is a schematic diagram of a control assembly of the pressure sweep valve of FIG. 1; FIG. 9 is a schematic diagram of a front side of a first PCB of the pressure scan valve of FIG. 1; fig. 10 is a rear view of the first PCB of the pressure scanning valve shown in fig. 1.
In this embodiment, the air guide needle nozzle assembly 42 includes a housing 1, a cover plate assembly 2, a pressure sensing assembly 4, and a control assembly 3.
The pressure sensing assembly 4 is used for acquiring pressure information, the control assembly 3 is used for processing the pressure information acquired by the pressure sensing assembly 4, and meanwhile, the control assembly 3 can also achieve the purpose of sealing the reference pressure air guide needle nozzle 422 and the plurality of test pressure air guide needle nozzles 421 in the air guide needle nozzle assembly 42. Specifically, the shell 1 is hermetically connected with the cover plate component 2; the pressure sensing assembly 4 comprises a plurality of pressure-sensitive chips 41, an air guide needle nozzle assembly 42 and an air pressure chamber 43, and the pressure-sensitive chips 41 and the control assembly 3 are arranged in the shell 1; the air guide needle nozzle assembly 42 comprises a reference pressure air guide needle nozzle 422 and a plurality of test pressure air guide needle nozzles 421; the control assembly 3 at least comprises a first PCB 31, and the channel interfaces of the reference pressure air guide needle nozzle 422 and the plurality of test pressure air guide needle nozzles 421 are sealed on the first PCB 31. Specifically, as shown in fig. 10, the first PCB 31 includes a plurality of first PCB test pressure air inlet through holes 311 and a single first PCB reference pressure air inlet through hole 312, the number of the first PCB test pressure air inlet through holes 311 may be set according to the type of the pressure scanning valve, for example, an 8-channel pressure scanning valve, and the number of the first PCB test pressure air inlet through holes 311 is 8, in this application, the 8-channel pressure scanning valve is taken as an example for detailed description. With the above arrangement, by sealing the ports of the test pressure channel and the reference pressure channel in the same plane, that is, on the first PCB 31, since all the scanning valves need to be connected to the outside through the air guide nozzle assembly 42, the air nozzles should be arranged in the same direction as much as possible from the initial design. The beneficial effects are as follows: the periphery of the last pressure scanning valve is prevented from needing air outlet nozzles, the design of the air outlet nozzles at the periphery not only occupies more space, but also is not well installed in the pneumatic measurement of the model, and inconvenience is brought to a pneumatic test.
On the basis of the above embodiments, the test air pressure guide needle nozzles 421 are arranged linearly and uniformly, and each test air pressure guide needle nozzle 421 is connected to the same reference air pressure end.
On the basis of the above embodiments, the air guide needle nozzle assembly 42 further includes a base 424 mountable on the casing 1, and the reference air guide needle nozzle 422 and the test air guide needle nozzle 421 are both disposed on the base 424; the air guide needle nozzle assembly 42 is detachably and hermetically arranged on the cover plate assembly 2; the base 424 is also provided with a base 424 reference pressure air inlet through hole and a plurality of base 424 test pressure air inlet through holes; the test pressure air guide needle nozzle 421, the reference pressure air guide needle nozzle 422, the base 424 reference pressure air inlet through hole and the base 424 test pressure air inlet through hole are all processed by adopting a high-frequency longitudinal-torsional composite ultrasonic vibration punching method, the inner wall of the hole is smoother, and the positioning precision is higher. Further, base mounting through holes 423 are provided at both left and right ends of the base 424, the base mounting through holes 423 of the base 424 and the cover plate 2 are connected by fasteners 425, and the fasteners 425 are preferably screws.
The test pressure gas needle nozzle 421 and the reference pressure gas needle nozzle 422 of the gas guide needle nozzle assembly 42 are processed by a high-frequency longitudinal-torsional composite ultrasonic vibration punching method, ultrasonic processing under the condition of applying longitudinal-torsional composite vibration has a motion form different from that of a traditional processing means, and the difference of the motion forms causes unique changes of a processing process and process characteristics, so that the ultrasonic processing process means has a plurality of unique processing characteristics, a material removing mechanism is changed, and the change is towards the direction which is more beneficial to material micro-crushing removal, uniform surface processing and surface quality optimization.
Furthermore, the longitudinal-torsional composite ultrasonic vibration punching method is characterized in that high-frequency controllable ultrasonic vibration with a certain period is generated by exciting an external ultrasonic power supply while a cutter rotates, the high-frequency controllable ultrasonic vibration acts on the cutting direction and the cutting depth direction of the cutter, so that the cutter rotates and simultaneously performs high-frequency vibration along the axial direction and the radial direction, and the movement mode of the cutter can be decomposed into three independent movements, namely, the rotation movement around a main shaft, the radial feeding movement, the vibration and the axial ultrasonic vibration movement.
In this embodiment, as shown in fig. 3, the actual processing motion trajectory of the tool may be synthesized from simple harmonic motions in two directions, i.e., x and z, perpendicular to each other, in the xz plane, where the simple harmonic motions have the same frequency but a certain phase difference, and different motion trajectories of the tool during the processing process may be obtained by combining the difference in phase difference between the simple harmonic vibrations of the longitudinal and torsional vibrations. When the vibration phase difference in the two directions is 0 degree or 180 degrees, the motion track of the cutter is a straight line; when the angle is 90 degrees, the track is a positive ellipse with x as a long axis and z as a short axis; when the phase difference is at other angles, such as 45 ° and 135 °, the motion trajectory is an inclined ellipse. When the phase difference is not a special value, the synthetic track of the cutter is an elliptical track taking the amplitudes of two vertical directions as the major and minor axes, the motion direction of the mass point is changed in real time, the actual motion track and the motion direction of the cutter in the longitudinal-torsional resonance ultrasonic machining process can be obtained by adjusting the amplitudes and the phase difference of the two vibration directions x and z, the most appropriate vibration machining cutting state is found, and therefore the characteristics and the machining effect of the machining process are well influenced. The beneficial effects are as follows: the motion state of the cutter relative to the workpiece is changed, the traditional continuous contact processing mode is essentially changed into periodic high-frequency intermittent separation type processing, the cutter and the workpiece are in contact and separated repeatedly in a circulating mode, high-frequency periodic pulse type intermittent processing is realized, and the abrasive particles of the cutter do not have grinding effect on materials in the separation stage and can keep the sharpness of the abrasive particles; in the descending contact cutting stage of the cutter, the cutter speed and acceleration are extremely high, instantaneous cutting impact can enable high stress concentration and energy concentration to be generated near a cutting tool, impact machining characteristics are formed, a machining area is concentrated at the excircle of the cutter, the material at the front end of abrasive particles is extruded, cracks which develop obliquely and forwards are generated, plasticity removal is easy to generate in the machining process, and material removal is promoted.
Above-mentioned process punches through ultrasonic vibration's blade, along with the propulsion of tubulose cutter, lets in compressed air in to the cavity, and the aluminum alloy piece is taken out of in the cavity, concentrates the waste material to get rid of. The beneficial effects are as follows: according to the technical scheme provided by the invention, holes are easily punched on the aluminum alloy in a high-frequency vibration mode, the punching process is stable, the aperture size precision is high, the surface of the aperture wall is smooth and free of damage, the product percent of pass is greatly improved, the production efficiency is obviously improved, no debris is generated, no harmful gas is generated, the device is simple in structure, convenient to control and low in cost.
Further, in the longitudinal-torsional composite ultrasonic vibration punching method, the periodic ultrasonic vibration enables the vibration cutting speed and the acceleration and the direction to be changed at any time, so that the speed change characteristic is generated, the pitch vibration phenomenon in the cutting process is favorably inhibited, and the high-speed cutting effect is obtained under the low-speed condition. The beneficial effects are that: compared with common grinding, the processing characteristics of the unique motion form of the longitudinal-torsional composite vibration ultrasonic processing show remarkable process advantages in the actual processing process, and the method is more beneficial to plastic micro-crushing removal of materials, reduction of grinding force in the processing process, smooth and uniform grinding of grooves and optimization of the quality of the processed surface.
On the basis of the above embodiments, the test air guide pressing needle nozzle 421 and the reference air guide pressing needle nozzle 422 are processed and then joined with the base 424, and are made of aviation aluminum, so that welding is facilitated, the inner diameters of the test air guide pressing needle nozzle 421 and the reference air guide pressing needle nozzle 422 are 0.4-0.6mm, the outer diameters of the test air guide pressing needle nozzle 421 and the reference air guide pressing needle nozzle 422 are 1.4-1.6mm, and preferably, the inner diameters of the test air guide pressing needle nozzle 421 and the reference air guide pressing needle nozzle 422 are 0.5mm, and the outer diameters of the test air guide pressing needle nozzle 422 and the reference air guide needle nozzle 422 are 1.5 mm; the joint of the test pressure and air guide needle nozzle 421 and the reference pressure and air guide needle nozzle 422 with the base 424 is provided with high-temperature airtight glue, so that the test pressure and air guide needle nozzle is high-temperature resistant, good in air tightness and capable of meeting the test requirements.
On the basis of the above embodiments, the cover plate assembly 2 includes a cover plate body, on which a cover plate test pressure air inlet through hole 21, a cover plate reference pressure air inlet through hole 22, and a first mounting hole 25 are provided; the air guide needle nozzle assembly 42 is detachably inserted into the first mounting hole 25, and the reference pressure air guide needle nozzle 422 and each test pressure air guide needle nozzle 421 of the air guide needle nozzle assembly 42 are sealed with the cover plate body through the first sealing ring 23. Specifically, the first PCB test pressure inlet hole 311 of the first PCB 31 is coaxial and one-to-one with the cover plate test pressure inlet hole 21 of the cover plate body, the first PCB reference pressure inlet hole 312 is coaxial with the cover plate reference pressure inlet hole 22, and the air pressure between each air guide needle nozzle and the pressure sensitive chip 41 sequentially passes through the first PCB 31 and the air pressure transmission through hole of the cover plate body to transmit the air pressure. The cover plate body is also provided with a second mounting hole 26, and the cover plate body is connected with the shell through the second mounting hole 26.
On the basis of the above embodiments, the control assembly 3 further includes a second PCB 33 and a flexible connecting board 32 connected between the first PCB 31 and the second PCB 33; the cover plate body and the first PCB 31 are sealed through a second sealing ring 24, and the first PCB 31 is fixed at the bottom of the cover plate 2 through screws; specifically, a first PCB test pressure air inlet through hole 311 and a first PCB reference pressure air inlet through hole 312 are formed in the first PCB 31, and the air pressure transmission between the air guide needle nozzle assembly 42 and the pressure sensitive chip 41 is transmitted through the cover plate body and the air inlet through hole corresponding to the first PCB 31.
In addition to the above embodiments, the second PCB 33 is provided with a communication interface, and the housing 1 is provided with a jack corresponding to the communication interface. The communication interface is preferably a USB interface 331.
On the basis of the above embodiments, the pressure sensitive chip 41 and the air pressure chamber 43 are bonded to the control module 3 by gluing, the pressure sensitive chip 41 is sealed inside the air pressure chamber 43, and the air pressure chamber 43 provides a common reference pressure for the pressure sensitive chip 41.
On the basis of the above embodiments, the test air guide needle nozzle 421, the reference air guide needle nozzle 422, and the air pressure chamber 43 are all aluminum alloy pieces; the test air guide needle nozzle 421 and the reference air guide needle nozzle 422 are preferably air guide needle nozzles made of aviation aluminum.
On the basis of the above embodiments, the pressure-sensitive chip 41 is a differential pressure type MEMS pressure sensor, specifically, the pressure-sensitive chip 41 is a MEMS chip, and the chip area reaches 4 × 4mm2. The number of the pressure sensitive chips 41 can be 8, the pressure sensitive chips are distributed on the front surface of the first PCB 31 in a row and are uniformly glued and welded on the first PCB 31; the back of the first PCB 31 is hermetically communicated with the air pressure at the bottom of the cover plate body through the second sealing ring 24. The beneficial effects are as follows: the volume is further reduced for subsequent pressure sweep valve design. From the analysis on the original chip size, 8 chips on the length direction, every chip width is less than or equal to 4mm, and the chip interval is less than or equal to 3mm, then the length of whole array PCB board level is less than or equal to 60mm, is favorable to realizing the miniaturization of pressure scanning valve module: the size of the 8-channel sensing array is less than or equal to 60mm multiplied by 40mm multiplied by 30 mm.
In addition to the above embodiments, the cover plate assembly 2 further includes a sealing plate 27, the sealing plate 27 and the cover plate 2 are hermetically connected to form a sealed space, and the air pressure chamber 43 is located in the sealed space. With the above arrangement, the cover plate 2 provides a secondary seal for the reference pressure by the sealing plate 27, and the air pressure chamber 43 is sealed in the sealed space formed by the cover plate 2 and the sealing plate 27, thereby further improving the reliability. Specifically, the bottom of apron body is equipped with the supporting part that is used for installing closing plate 27, and closing plate 27 sees through the metal step card and goes into the apron body to fill all around and endure high low temperature's airtight glue, can realize the sealed effect within 20 psi.
In addition to the above embodiments, the cover plate 2, the second PCB 33 and the bottom of the case 1 are fastened by a plurality of copper pillars 5. Specifically, the copper pillars 5 are distributed at three corners inside the housing 1, wherein 2 copper pillars 5 are distributed at one corner, and the other two corners are respectively distributed with one copper pillar 5.
In a specific embodiment, the pressure scanning valve comprises a shell 1, a cover plate 2, a control component 3, a pressure sensing component 4 and a copper column 5; the control component 3 is positioned in the shell 1, the control component 3 comprises a first PCB 31, a connecting soft board 32 and a second PCB 33, and the first PCB 31 and the second PCB 33 are connected through the connecting soft board 32; the pressure sensor assembly comprises a pressure sensitive chip 41, a gas guide needle nozzle assembly 42 and a gas pressure chamber 43, the gas guide needle nozzle assembly 42 is detachably and hermetically mounted on the cover plate body, the pressure sensitive chip 41 and the control assembly 3 are both mounted in the shell 1, and the shell 1 is hermetically connected with the cover plate 2; as shown in fig. 1, the housing 1 is provided with a connector corresponding to the USB interface 331; as shown in fig. 8, the first PCB 31 includes a first PCB test pressure air inlet hole 311 and a first PCB reference pressure air inlet hole 312, the number of the first PCB test pressure air inlet holes 311 is 8, the first PCB test pressure air inlet holes are uniformly distributed on the first PCB 31 in a row, and the test air pressure is connected from the 8-channel test pressure air guide needle nozzle 421 to the air pressure input on the back of the pressure sensitive chip 41; the number of the first PCB reference pressure air inlet through holes 312 is 1, and the first PCB reference pressure air inlet through holes are located below the first PCB test pressure air inlet through hole 311, and provide a connection for inputting reference air pressure from the reference pressure air guide needle nozzle 422 to the air pressure chamber 43.
The air guide needle nozzle assembly 42 comprises N independent test air guide needle nozzles 421, a single reference air guide needle nozzle 422 and an air pressure chamber 43; as shown in fig. 7, the mount mounting through hole 423 fastens the air guide needle tip assembly 42 and the cover plate 2 together by screws; as shown in fig. 8, the first PCB 31 and the second PCB 33 are connected by the flexible connecting board 32, and the interface of the flexible connecting board 32 connecting the first PCB 31 and the second PCB 33 may be a 10-pin I2C bus interface.
As shown in fig. 9, the air chamber 43 is bonded to the front surface of the first PCB 31 by gluing, and the N pressure-sensitive chips 41 are uniformly arranged in a row inside the air chamber 43 and share a reference pressure through the air chamber 43. The first PCB board reference pressure air inlet through hole 312 provides reference air pressure, and the connection from the reference pressure air guide needle nozzle 422 to the air pressure chamber 43 inputs air pressure; the pressure-sensitive chip 41 is closely attached to the first PCB 31 through the second sealing ring 24, so that the test air pressure is completely isolated from the reference air pressure; in the pressure chamber 43, the pressure-sensitive chip 41 is fixed by the central through hole of M1.2, and at the same time, the through hole on the screw is connected with the upper cover plate test pressure inlet through hole 21, the airtight structure has reached the complete gas connection, the pressure chamber 43 inputs the reference pressure through the cover plate reference pressure inlet through hole 22, and the internal pressure of the pressure chamber 43 is the reference pressure.
In this embodiment, the following factors are mainly considered in the sealing design: firstly, the isolation between the reference pressure and the measured pressure is realized by gluing and welding the pressure-sensitive chip 41 and the first PCB 31; secondly, the pressure channel is sealed with the connecting through hole, and the first sealing ring 23 and the second sealing ring 24 are mainly used for increasing screw fastening and tight sealing. The machining process has high requirement on flatness, and warpage must be avoided to ensure tight connection of 9 air holes. And thirdly, sealing the led-out air guide nozzle, and taking high-temperature airtight glue into consideration.
In this embodiment, regarding the air nozzle gasket of the cover plate assembly 2, including the first sealing ring 23 and the second sealing ring 24, a space of 0.6mm is left under the air nozzle fixing seat 424 for installing a rubber gasket with an outer diameter of 2mm as an airtight scheme at the connection with the air inlet passage of the plenum 43. The gasket is made of fluororubber, namely FKM, can be used in a working environment of-40-250 ℃, and has the properties of high temperature resistance, acid and alkali resistance and pressure resistance, and the maximum bearing pressure is 10 psi.
In the present embodiment, the PCB and the airtight plate are hermetically sealed by the airtight plate made of aluminum alloy and the first PCB 31 before and after the pneumatic chamber 43. The airtight plate at the front end is jointed by adopting a bolt and gluing mode and is assembled by 4M 1.2 countersunk head screws; the first PCB 31 at the rear end simultaneously performs a packaging action through the rubber gasket while being connected to the pressure sensitive chip 41.
The working principle is as follows: the analog signal collected by the pressure-sensitive chip 41 firstly passes through a complete path which comprises an instrument amplifier, a programmable amplifier, a low-pass filter and an ADC; then, through digital filtering, aliasing digital temperature compensation reaches stable digital type output. The servo module realizes the compensation of a temperature sensor with digital output by a self-checking function and utilizing a high-precision clock to control a time sequence, the temperature drift characteristic of the pressure sensor is calibrated and compensated, a finished product with high stability and high precision is finally formed and output to an upper computer connected to the USB interface 331, and the upper computer corrects the finished product by adopting a software algorithm, so that the linearity of the sensor is ensured.
The pressure scanning valve has the following advantages:
1. and (3) miniaturization: the volume of the 8-channel pressure scanning valve module is expected to reach 60mm multiplied by 40mm multiplied by 30 mm;
2. the air guide needle nozzle assembly 42 is detachably arranged on the cover plate assembly 2, so that the replacement is convenient and the maintainability is good;
3. 1 internal seal of casing can guarantee the sealing performance of each part in casing 1, guarantee pressure measurement's reliability: the sealing of the pressure to be measured is ensured by the two airtight rings, i.e., the first sealing ring 23 and the second sealing ring 24, and the airtightness of the reference pressure is ensured by the two sealings of the pressure chamber 43 and the sealing plate 27.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The pressure scanning valve provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A pressure scanning valve is characterized by comprising a shell (1), a cover plate component (2), a pressure sensing component (4) used for acquiring pressure information and a control component (3), wherein the control component (3) is used for processing the pressure information acquired by the pressure sensing component (4), and the shell (1) is hermetically connected with the cover plate component (2); the pressure sensing assembly (4) comprises a plurality of pressure sensitive chips (41), an air guide needle nozzle assembly (42) and an air pressure chamber (43), and the pressure sensitive chips (41) and the control assembly (3) are arranged in the shell (1); the air guide needle nozzle assembly (42) comprises a reference air guide needle nozzle (422) and a plurality of test air guide needle nozzles (421); the control assembly (3) at least comprises a first PCB (31), and channel interfaces of the reference pressure gas guide needle nozzle (422) and the test pressure gas guide needle nozzles (421) are sealed on the first PCB (31).
2. The pressure scanning valve according to claim 1, wherein each pressure measurement and test air guide needle nozzle (421) is arranged in a straight line shape, and each pressure measurement and test air guide needle nozzle (421) is connected to the same reference air pressure end.
3. The pressure scanning valve according to claim 1, characterized in that the air guide needle nozzle assembly (42) further comprises a base (424) mountable on the housing (1), the reference pressure air guide needle nozzle (422) and the pressure test air guide needle nozzle (421) being provided on the base (424); the air guide needle nozzle assembly (42) is detachably and hermetically arranged on the cover plate assembly (2); the base (424) is also provided with a base (424) reference pressure air inlet through hole and a plurality of base (424) test pressure air inlet through holes; the pressure measurement and test air guide needle nozzle (421), the reference pressure air guide needle nozzle (422), the base (424) reference pressure air inlet through hole and the base (424) test pressure air inlet through hole are processed by adopting a high-frequency longitudinal-torsional composite ultrasonic vibration punching method.
4. The pressure scanning valve according to claim 1, wherein the cover assembly (2) comprises a cover body, and a cover test pressure inlet through hole (21), a cover reference pressure inlet through hole (22) and a first mounting hole (25) are arranged on the cover body; the air guide needle nozzle assembly (42) is detachably inserted into the first mounting hole (25), and a reference air guide pressing needle nozzle (422) and each testing air guide pressing needle nozzle (421) of the air guide needle nozzle assembly (42) are sealed with the cover plate body through a first sealing ring (23).
5. The pressure scanning valve according to claim 4, characterized in that said control assembly (3) further comprises a second PCB board (33) and a connection soft board (32) connected between said first PCB board (31) and said second PCB board (33); the cover plate body and the first PCB (31) are sealed through a second sealing ring (24).
6. A pressure scanning valve according to claim 5, characterized in that the second PCB (33) is provided with a communication interface, and the housing (1) is provided with a jack corresponding to the communication interface.
7. A pressure scanning valve according to claim 1, characterized in that the pressure sensitive chip (41) and the pressure chamber (43) are glued on the control assembly (3), the pressure sensitive chip (41) is sealed inside the pressure chamber (43), and the pressure chamber (43) provides a common reference pressure for the pressure sensitive chip (41).
8. The pressure scanning valve according to claim 7, characterized in that the pressure measurement pressure guide needle nozzle (421), the reference pressure guide needle nozzle (422) and the pressure chamber (43) are all aluminum alloy pieces.
9. Pressure scanning valve according to claim 1, characterized in that the pressure sensitive chip (41) is a differential pressure type MEMS pressure sensor.
10. A pressure scanning valve according to any of claims 1 to 9, characterized in that the cover plate assembly (2) further comprises a sealing plate (27), the sealing plate (27) and the cover plate (2) being sealingly connected to form a closed space, the pressure chamber (43) being located in the closed space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210694565.9A CN114777992A (en) | 2022-06-20 | 2022-06-20 | Pressure scanning valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210694565.9A CN114777992A (en) | 2022-06-20 | 2022-06-20 | Pressure scanning valve |
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| Publication Number | Publication Date |
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| CN114777992A true CN114777992A (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210694565.9A Pending CN114777992A (en) | 2022-06-20 | 2022-06-20 | Pressure scanning valve |
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| CN (1) | CN114777992A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403348A (en) * | 2015-10-29 | 2016-03-16 | 中国空气动力研究与发展中心设备设计及测试技术研究所 | Programmable high-integration multichannel pressure test device |
| CN106370345A (en) * | 2016-08-25 | 2017-02-01 | 中国电子科技集团公司第四十八研究所 | Multichannel pressure scanning valve |
| CN107966235A (en) * | 2017-11-27 | 2018-04-27 | 中国科学院工程热物理研究所 | A kind of high-precision pressure measuring system of variable reference pressure |
| CN209606004U (en) * | 2019-03-21 | 2019-11-08 | 湖南诺威测控技术有限公司 | A kind of multi-path pressure scanning measuring and controlling equipment |
| CN211904526U (en) * | 2020-05-22 | 2020-11-10 | 昆山御宾电子科技有限公司 | Pneumatic push block type pressure electronic scanning valve |
| CN211904520U (en) * | 2020-05-09 | 2020-11-10 | 昆山御宾电子科技有限公司 | Multichannel high accuracy pressure data acquisition device |
| CN113252237A (en) * | 2021-04-23 | 2021-08-13 | 四川天利科技有限责任公司 | Miniature pressure scanning valve |
| CN113513615A (en) * | 2021-04-23 | 2021-10-19 | 四川天利科技有限责任公司 | Pneumatic multifunctional pressure scanning valve |
| CN216593941U (en) * | 2021-12-23 | 2022-05-24 | 昆山御宾电子科技有限公司 | Small pressure measuring instrument and pressure scanning valve |
-
2022
- 2022-06-20 CN CN202210694565.9A patent/CN114777992A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403348A (en) * | 2015-10-29 | 2016-03-16 | 中国空气动力研究与发展中心设备设计及测试技术研究所 | Programmable high-integration multichannel pressure test device |
| CN106370345A (en) * | 2016-08-25 | 2017-02-01 | 中国电子科技集团公司第四十八研究所 | Multichannel pressure scanning valve |
| CN107966235A (en) * | 2017-11-27 | 2018-04-27 | 中国科学院工程热物理研究所 | A kind of high-precision pressure measuring system of variable reference pressure |
| CN209606004U (en) * | 2019-03-21 | 2019-11-08 | 湖南诺威测控技术有限公司 | A kind of multi-path pressure scanning measuring and controlling equipment |
| CN211904520U (en) * | 2020-05-09 | 2020-11-10 | 昆山御宾电子科技有限公司 | Multichannel high accuracy pressure data acquisition device |
| CN211904526U (en) * | 2020-05-22 | 2020-11-10 | 昆山御宾电子科技有限公司 | Pneumatic push block type pressure electronic scanning valve |
| CN113252237A (en) * | 2021-04-23 | 2021-08-13 | 四川天利科技有限责任公司 | Miniature pressure scanning valve |
| CN113513615A (en) * | 2021-04-23 | 2021-10-19 | 四川天利科技有限责任公司 | Pneumatic multifunctional pressure scanning valve |
| CN216593941U (en) * | 2021-12-23 | 2022-05-24 | 昆山御宾电子科技有限公司 | Small pressure measuring instrument and pressure scanning valve |
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Application publication date: 20220722 |