CN114705351A - Differential pressure type central air pressure transmission module applied to 32-channel pressure scanning valve - Google Patents
Differential pressure type central air pressure transmission module applied to 32-channel pressure scanning valve Download PDFInfo
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- CN114705351A CN114705351A CN202210336219.3A CN202210336219A CN114705351A CN 114705351 A CN114705351 A CN 114705351A CN 202210336219 A CN202210336219 A CN 202210336219A CN 114705351 A CN114705351 A CN 114705351A
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Abstract
The invention discloses a differential pressure type central air pressure transmission module applied to a 32-channel pressure scanning valve, which is integrally cuboid and complex in internal pipeline and comprises 32 independent test pressure transmission channels, a reference pressure first transmission channel, a reference pressure second transmission channel, a calibration pressure transmission channel and a manual mode switching through hole. The invention can meet the requirement of 32-channel air pressure transmission, and can realize two working modes by changing the position of the central air pressure transmission module in the horizontal direction in the applied 32-channel pressure scanning valve: normal pressure measurement mode and calibration mode realize the pluralism of function to the maintainability is good, and as being applied to the inside independent atmospheric pressure transmission module of pressure scanning valve, the convenient change that changes.
Description
Technical Field
The invention mainly relates to the technical field of pressure measurement, in particular to a differential pressure type central air pressure transmission module applied to a 32-channel pressure scanning valve.
Background
The pressure scanning valve is a novel test device, and is an intelligent sensing device for realizing real-time measurement of multiple paths of pressure signals. The system is widely applied and mainly applied to pressure-related test systems such as aircraft online tests, wind tunnel tests, flight tests, engine tests, wind and sand environment tests, automobile simulation tests and the like. The pressure scanning valve commonly used at present generally has the defects of small channel number, single working mode, large volume, multiple accessories and the like, and needs to research and develop pressure scanning measurement and control equipment with multiple channels, multiple working modes, high integration, miniaturization and accurate pressure measurement.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a differential pressure type central air pressure transmission module which is provided with multiple channels, multiple working modes, a simple structure and miniaturization and applies a 32-channel pressure scanning valve.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a differential pressure type central air pressure transmission module applied to a 32-channel pressure scanning valve is of a square structure, 32 independent test pressure transmission channels, a reference pressure first transmission channel, a reference pressure second transmission channel and a calibration pressure transmission channel are arranged inside the differential pressure type central air pressure transmission module, and the differential pressure type central air pressure transmission module supports two working modes, namely a normal pressure measurement mode and a calibration mode;
and the middle part above the differential pressure type central air pressure transmission module is provided with a manual mode switching through hole.
Furthermore, the ports at the two ends of the pressure test transmission channel are respectively a first test pressure port and a second test pressure port; the number of the first pressure testing ports is 32, the first pressure testing ports are used for inputting testing air pressure, half of the 32 first pressure testing ports are arranged at the left part of the upper surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows, and the other half of the 32 first pressure testing ports are arranged at the right part of the upper surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows and 4 rows; the number of the second pressure testing ports is 32, the second pressure testing ports are used for outputting testing air pressure, half of the 32 second pressure testing ports are arranged on the left parts of the front side surface and the rear side surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows, and the other half of the 32 second pressure testing ports are arranged on the right parts of the front side surface and the rear side surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows and 4 rows; the 32 first ports of testing pressure and the 32 second ports of testing pressure are respectively communicated one by one to form 32 independent testing pressure transmission channels.
Furthermore, two end ports of the first reference pressure transmission channel are respectively a first reference pressure port and a second reference pressure port; the number of the first reference pressure ports is 1, the first reference pressure ports can be used for inputting reference air pressure in a normal pressure measuring mode, and the 1 first reference pressure port is formed in the upper surface of the differential pressure type central air pressure transmission module and is positioned between the first left part pressure measuring port and the first right part pressure measuring port; the number of the reference pressure second ports is 4, the reference pressure second ports can be used for outputting reference air pressure in a normal pressure measurement mode, 2 of the 4 reference pressure second ports are arranged on the front side face of the differential pressure type central air pressure transmission module and are positioned between the left part of the front side face of the second port for pressure measurement and the right part of the second port for pressure measurement, and the other 2 of the 4 reference pressure second ports are arranged on the rear side face of the differential pressure type central air pressure transmission module and are positioned between the left part of the rear side face of the second port for pressure measurement and the right part of the second port for pressure measurement; the 1 reference pressure first port and the 4 reference pressure second ports are communicated to form a reference pressure first transmission channel; the reference voltage first transmission channel is inoperative in the calibration mode.
Furthermore, two end ports of the reference voltage second transmission channel are a reference voltage third port and a reference voltage fourth port respectively; the number of the reference pressure third ports is 1, the reference pressure third ports can be used for inputting reference air pressure in a calibration mode, and the 1 reference pressure third ports are formed in the upper surface of the differential pressure type central air pressure transmission module and are positioned between the left part of first port of the pressure test and the right part of first port of the pressure test; the four reference pressure ports are 4 and can be used for outputting reference air pressure in a calibration mode, 2 of the 4 reference pressure ports are arranged on the front side face of the differential pressure type central air pressure transmission module and are positioned between the left part of the front side face of the second port of the pressure test and the right part of the second port of the pressure test and the other 2 of the 4 reference pressure ports are arranged on the rear side face of the differential pressure type central air pressure transmission module and are positioned between the left part of the rear side face of the second port of the pressure test and the right part of the pressure test; the 1 reference voltage third port and the 4 reference voltage fourth ports are communicated to form a reference voltage second transmission channel; the reference pressure second transmission channel does not function in the normal pressure measurement mode.
Furthermore, the 4 reference pressure second ports and the 4 reference pressure fourth ports are arranged in parallel in the horizontal direction, and each reference pressure second port is 2.5mm away from the reference pressure fourth port in the same horizontal direction; the maximum distance that the differential pressure type central air pressure transmission module is arranged in the valve body of the pressure scanning valve and can be pushed is 2.5 mm.
Furthermore, the ports at the two ends of the calibration transmission channel are respectively a calibration pressure first port and a calibration pressure second port; the number of the first calibration pressure ports is 1, the first calibration pressure ports can be used for inputting calibration air pressure in a calibration mode, and the 1 first calibration pressure port is formed in the upper surface of the differential pressure type central air pressure transmission module and is positioned between the first left part pressure test port and the first right part pressure test port; the number of the second calibration pressure ports is 32, and the second calibration pressure ports can be used for outputting calibration air pressure in a calibration working mode, one half of the 32 second calibration pressure ports are arranged on the left parts of the front side surface and the rear side surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows, and the other half of the 32 second calibration pressure ports are arranged on the right parts of the front side surface and the rear side surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows and 4 lines; the 1 calibration pressure first port and the 32 calibration pressure second ports are communicated to form a calibration pressure transmission channel; the calibration pressure transmission channel does not function in the normal pressure measurement mode.
Furthermore, 32 test pressure second ports and 32 calibration pressure second ports are horizontally arranged at intervals on the front side surface or the rear side surface of the differential pressure type central air pressure transmission module, and each test pressure second port is 2.5mm away from the calibration pressure second port in the same horizontal direction; the maximum distance that the differential pressure type central air pressure transmission module is arranged in the valve body of the pressure scanning valve and can be pushed is 2.5 mm.
Furthermore, a calibration pressure process hole for processing a calibration transmission channel is formed in the side face of the differential pressure type central air pressure transmission module, and the calibration pressure process hole is blocked by glue.
A pressure scanning valve comprises a pressure scanning valve body and a differential pressure type central air pressure transmission module applied to a 32-channel pressure scanning valve, wherein the differential pressure type central air pressure transmission module is arranged in the pressure scanning valve body.
A pressure scanning valve comprises a pressure scanning valve body and all the differential pressure type central air pressure transmission modules applied to a 32-channel pressure scanning valve, wherein the differential pressure type central air pressure transmission modules are arranged in the pressure scanning valve body;
the pressure scanning valve body comprises a pressure sensing assembly, a cover plate assembly and a pressurizing piston;
the number of the pressure sensing assemblies is 4, and each pressure sensing assembly consists of a first PCB, 8 pressure-sensitive chips arranged on the first PCB and an air pressure chamber formed by an inner cavity of the pressure sensing assembly and a shell; 2 pressure sensing assemblies are arranged at the front end of the pressure scanning valve body in an up-down side-by-side manner, and the other 2 pressure sensing assemblies are arranged at the rear end of the pressure scanning valve body in an up-down side-by-side manner; the pressure-sensitive chip is a differential pressure type MEMS pressure sensor, the front side of the pressure-sensitive chip shares reference pressure in an air pressure chamber, the back side of the pressure-sensitive chip has two conditions, test air pressure is input through a test pressure transmission channel of the module in a normal pressure measurement mode, and calibration air pressure is input through a calibration pressure transmission channel of the module in a calibration mode;
the cover plate component consists of a cover plate arranged at the upper end of the pressure scanning valve body, a cover plate pressure measurement and test air guide needle nozzle, a cover plate reference pressure first air guide needle nozzle, a cover plate reference pressure second air guide needle nozzle, a cover plate calibration pressure air guide needle nozzle and a cover plate pressure charging piston air guide needle nozzle which are arranged on the cover plate;
the number of the pressurizing pistons is 2, and the pressurizing pistons are respectively arranged on the left side and the right side of the valve body of the pressure scanning valve; 2 pressurizing pistons are connected with the cover plate pressurizing piston air guide needle nozzle; when the pressurizing piston at one side is pressurized, the pressurizing piston at the other side is depressurized, a pushing effect to the other side exists on the differential pressure type central air pressure transmission module, the differential pressure type central air pressure transmission module is displaced by 2.5mm in the horizontal direction in the valve body of the pressure scanning valve, and the two positions respectively correspond to two working modes, namely a normal pressure measuring mode and a calibration mode;
in a normal pressure measuring mode, the cover plate pressure measuring and testing air guide needle nozzle is hermetically connected with the pressure measuring and testing first port and used for inputting test air pressure, and the input test air pressure is output to the back of the pressure sensitive chip from the test pressure second port through the test pressure transmission channel; in a normal pressure measuring mode, the cover plate is connected with the first gas guide needle nozzle of the reference pressure in a sealing mode and used for inputting reference air pressure, and the input reference air pressure is output to an air pressure chamber of the pressure sensing assembly from the second port of the reference pressure through the first transmission channel of the reference pressure; under a normal pressure measuring mode, the 32-channel pressure scanning valve outputs pressure difference of pressure measuring and reference pressure of 32 channels;
in the calibration mode, the pressurizing piston has a force pushing effect on the differential pressure type central air pressure transmission module, the differential pressure type central air pressure transmission module is displaced by 2.5mm in the pressure scanning valve body relative to the normal pressure measurement mode, the cover plate calibration pressure air guide needle nozzle is hermetically connected with the calibration pressure first port and used for inputting calibration air pressure, and the input calibration air pressure is output to the back of the pressure-sensitive chip through the calibration pressure second port; in the calibration mode, the cover plate reference pressure second gas guide needle nozzle is hermetically connected with the reference pressure third port and used for inputting reference air pressure, and the input reference air pressure is output to the air pressure chamber through the reference pressure fourth port; in the calibration mode, all of the outputs of the 32-channel pressure sweep valve are differential pressures of the calibration pressure and the reference pressure.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention realizes the diversification of functions by changing the position of the differential pressure type central air pressure transmission module in the horizontal direction in the applied pressure scanning valve, and the invention supports two working modes: a normal pressure measuring mode and a calibration mode;
(2) the invention is applied to the interior of the 32-channel pressure scanning valve, is convenient to replace, has good maintainability and small volume, and effectively reduces the size of a product.
Drawings
Fig. 1 is a schematic structural diagram of a differential pressure type central air pressure transmission module according to the present invention.
Fig. 2 is a schematic top view of a differential pressure type central air pressure transmission module according to the present invention.
Fig. 3 is a schematic front view of a differential pressure type central air pressure transmission module according to the present invention.
Fig. 4 is a front perspective view of a differential pressure central air pressure transport module of the present invention.
Fig. 5 is a schematic diagram of the pressure sensing assembly of the present invention.
Fig. 6 is a schematic view of the overall structure of the present invention.
FIG. 7 is a cross-sectional view of a test pressure delivery channel of the present invention.
Fig. 8 is a cross-sectional view of a reference pressure first transmission channel of the present invention.
Fig. 9 is an overall exploded view of the present invention.
In the figure: 1. a test pressure transmission channel; 11. testing a pressure first port; 12. a pressure measurement and test second port; 2. a reference pressure first transmission channel; 21. a reference pressure first port; 22. a reference pressure second port; 3. a reference voltage second transmission channel; 31. a reference pressure third port; 32. a reference pressure fourth port; 4. calibrating a pressure transmission channel; 41. calibrating the pressure first port; 42. calibrating the second port; 43. calibrating and pressing a process hole; 5. a manual mode switching via; 6. a pressure sensing assembly; 61. a pressure sensitive chip; 62. an air pressure chamber; 63. a first PCB board; 7. a housing; 8. a cover plate; 81. a cover plate pressure measurement and test air guide needle nozzle; 82. the cover plate is used for pressing the first air guide needle nozzle in a reference manner; 83. the cover plate is used for pressing the second air guide needle nozzle in a reference manner; 84. the cover plate calibrates and presses the air guide needle nozzle; 85. a cover plate pressurizing piston air guide needle nozzle; 9. the piston is pressurized.
Detailed Description
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.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in fig. 1 to 4, a differential pressure type central air pressure transmission module applied to a 32-channel pressure scanning valve is of a cuboid structure as a whole, has a plurality of through holes on the surface, is complex in internal pipeline, and supports two working modes while meeting the 32-channel air pressure transmission requirement: a normal pressure measurement mode and a calibration mode. The differential pressure type central air pressure transmission module comprises 32 independent test pressure transmission channels 1, a reference pressure first transmission channel 2, a reference pressure second transmission channel 3, a calibration pressure transmission channel 4 and a manual mode switching through hole 5.
As shown in fig. 1 to 4, 32 test pressure transmission channels 1, which are independent from each other, exist inside the differential pressure type central air pressure transmission module. The ports at the two ends of the pressure measurement and test transmission channel are respectively called a first pressure measurement and test port 11 and a second pressure test port 12, wherein the first pressure measurement and test port 11 is distributed on the upper surface of the differential pressure type central air pressure transmission module, and the second pressure test port 12 is distributed on the front and rear side surfaces of the differential pressure type central air pressure transmission module. Each test pressure transmission channel 1 has its own test pressure first port 11 and test pressure second port 12. The number of the first ports 11 of the test pressure is 32 in total, 8 rows are total, and 4 ports in one row can be used for inputting the test air pressure. The total number of 32 ports on two sides of the second test pressure port 12 is 4, and 4 rows are respectively distributed on the front side surface and the rear side surface of the differential pressure type central air pressure transmission module, and each row is 4 and can be used for outputting test air pressure.
As shown in fig. 1 to 4, the reference pressure first transmission channel 2 exists inside the differential pressure type central air pressure transmission module, and only works in the normal pressure measurement mode, but does not work in the calibration mode. The ports at the two ends of the reference pressure first transmission channel 2 are respectively called a reference pressure first port 21 and a reference pressure second port 22, wherein the reference pressure first port 21 is distributed on the upper surface of the differential pressure type central air pressure transmission module, and the reference pressure second ports are distributed on the front and rear side surfaces of the differential pressure type central air pressure transmission module. The reference pressure first port 21 has 1 port in total, and can be used for inputting reference air pressure in the normal pressure measurement mode. The reference pressure second ports 22 are respectively distributed at 2 on the front side and the rear side of the differential pressure type central air pressure transmission module, and 4 ports are totally arranged at two sides, so that the reference pressure second ports can be used for outputting reference air pressure in a normal pressure measurement mode. Therefore, the 4 reference pressure second ports 22 are connected to the reference pressure first port 21, and the reference pressure input from the reference pressure first port 21 is uniformly output.
As shown in fig. 1 to 4, the reference pressure second transmission channel 3 exists inside the differential pressure type central air pressure transmission module, and only works in the calibration mode, but does not work in the normal pressure measurement mode. The ports at the two ends of the reference pressure second transmission channel 3 are respectively called a reference pressure third port 31 and a reference pressure fourth port 32, wherein the reference pressure third port 31 is distributed on the upper surface of the differential pressure type central air pressure transmission module, and the reference pressure fourth ports 32 are distributed on the front and rear side surfaces of the differential pressure type central air pressure transmission module. The reference pressure third port 31 is 1 port in total and is available for inputting a reference air pressure in the calibration mode. The reference pressure fourth ports 32 are respectively distributed at 2 on the front side surface or the back side surface of the differential pressure type central air pressure transmission module, and 4 ports are totally arranged at two sides, and can be used for outputting the reference air pressure in the calibration mode. Therefore, the 4 reference pressure fourth ports 32 and the reference pressure third port 31 have a connection path, and the reference pressure input from the reference pressure third port 31 is uniformly output.
As shown in fig. 3, for each reference pressure fourth port 32, there is a reference pressure second port 22 corresponding to it in the horizontal direction by a distance of 2.5mm, 2.5mm being the maximum distance that can be pushed by the charging piston 9 in the horizontal direction when the present invention is applied inside the valve body of a pressure scanning valve.
As shown in fig. 1 to 4, the calibration transmission channel 4 exists inside the differential pressure type central air pressure transmission module, and only works in the calibration mode. The ports at two ends 4 of the calibration transmission channel are respectively called a calibration pressure first port 41 and a calibration pressure second port 42, wherein the calibration pressure first port 41 is distributed on the upper surface of the differential pressure type central air pressure transmission module, and the calibration pressure second port 42 is distributed on the front and back side surfaces of the differential pressure type central air pressure transmission module. The calibration pressure first port 41 is 1 port in total and is available for inputting calibration air pressure in the calibration mode. The calibration pressure is applied to both sides of the second port 42 for a total of 32 ports. The calibration pressure second port 42 is distributed in 4 rows, 4 in each row, on the front side surface or the back side surface of the differential pressure type central air pressure transmission module, and can be used for outputting calibration air pressure in the calibration operation mode. Therefore, the 32 calibration pressure second ports 42 are connected to the calibration pressure first port 41, and the calibration air pressure inputted from the calibration pressure first port 41 is uniformly outputted.
As shown in fig. 3, for each calibration pressure second port 42, there is a corresponding test pressure second port 12 in the horizontal direction at a distance of 2.5mm, 2.5mm being the maximum distance that can be pushed by the charging piston 9 in the horizontal direction when the present invention is applied inside the valve body of a pressure scanning valve.
In this embodiment, the calibration pressure process hole 43 is a process hole generated by processing the calibration pressure transmission channel 4, and is blocked by glue in practical application, and is not responsible for any function of air pressure transmission.
As shown in fig. 1 to 4, the manual mode switching through hole 5 is provided in the middle of the upper surface of the differential pressure type central air pressure transmission module, and is suitable for an emergency situation that the central air pressure transmission module is jammed in the pressure scanning valve body, and a metal hard stick can be inserted into the manual mode switching through hole to apply a force in the horizontal direction, so that the normal position of the differential pressure type central air pressure transmission module in the pressure scanning valve body is manually restored.
As shown in fig. 5, the pressure sensing assembly 6 is composed of a pressure sensitive chip 61, an air pressure chamber 62, and a first PCB board 63. The pressure sensitive chips 61 are 8 in number and are distributed in a row on the first PCB 63. The pressure sensor assembly 6 and the housing 7 are sealingly connected to form a pneumatic chamber 62. This embodiment is a 32-channel pressure-scanning valve, and therefore comprises a total of 4 pressure sensing assemblies 6, 2 pressure sensing assemblies 6 being arranged side by side up and down on the front and rear sides.
In this embodiment, the pressure-sensitive chip 61 is of a differential pressure type, the front surface thereof shares the reference pressure in the air pressure chamber 62, and the back surface thereof is divided into two cases: the testing air pressure is input through a testing pressure transmission channel 1 of the differential pressure type central air pressure transmission module in a normal pressure testing mode, and the calibration air pressure is input through a calibration pressure transmission channel 4 of the differential pressure type central air pressure transmission module in a calibration mode.
In this embodiment, the calibration mode refers to that, in a specific implementation example, the front surfaces of the 32 pressure sensitive chips 61 input a uniform reference pressure, and the back surfaces input a uniform calibration pressure, so as to define a same pressure reference value, and provide conditions for implementing a calibration function.
In this embodiment, a cover plate 8 at the upper end of the valve body of the pressure scanning valve is provided with a cover plate pressure measurement and control air guide needle nozzle 81, a cover plate reference pressure first air guide needle nozzle 82, a cover plate reference pressure second air guide needle nozzle 83, a cover plate calibration pressure air guide needle nozzle 84 and a cover plate pressure charging piston air guide needle nozzle 85.
As shown in fig. 6 to 9, the differential pressure type central air pressure transmission module of the present embodiment is applied to the interior of the valve body of the 32-channel pressure scanning valve. The left side and the right side of the valve body of the pressure scanning valve are respectively provided with 1 pressurizing piston 9, and the pressurizing pistons 9 are pressurized and decompressed through the cover plate pressurizing piston air guide needle nozzles 85. In this embodiment, when the pressurizing piston 9 on one side is pressurized, the pressurizing piston 9 on the other side is depressurized, so that there is a pushing effect on the differential pressure type central air pressure transmission module toward the other side. Therefore, the differential pressure type central air pressure transmission module can have two different positions inside the valve body of the pressure scanning valve, and the two positions respectively correspond to two working modes by a distance (2.5mm) relative to the displacement in the horizontal direction: a normal pressure measurement mode and a calibration mode.
As shown in fig. 6 to 9, in the normal pressure measurement mode, the cover plate pressure measurement pressure guide needle nozzle 81 and the test pressure first port 11 are hermetically connected for inputting the test pressure. The input test air pressure is output from the test pressure second port 12 to the back surface of the pressure-sensitive chip 61 through the test pressure transmission channel 1. In the normal pressure measuring mode, the cover plate reference pressure first air guide needle nozzle 82 is connected with the reference pressure first port 21 in a sealing mode and used for inputting reference air pressure. The input reference air pressure is output from the reference pressure second port 22 to the air pressure chamber 62 of the pressure sensing block 6 through the reference pressure first transmission passage 2. Therefore, in the normal pressure measuring mode, the 32-channel pressure scanning valve outputs the pressure difference between the pressure measuring pressure and the reference pressure of the 32 channels.
As shown in fig. 6 to 9, in the present embodiment, in the calibration mode, due to the pushing action of the pressurizing piston 9 on the differential pressure type central air pressure transmission module, the differential pressure type central air pressure transmission module is displaced by 2.5mm in the pressure scanning valve body relative to the normal pressure measurement mode, and is located at a new position. In the new position, the cover plate calibration air guide needle nozzle 84 is sealingly connected to the calibration air pressure first port 41 for inputting calibration air pressure. The inputted calibration air pressure is outputted to the back surface of the pressure sensitive chip 61 through the calibration pressure second port 42. In the calibration mode, the cover plate reference pressure second airway nozzle 83 is sealingly connected to the reference pressure third port 31 for inputting a reference air pressure. The inputted reference air pressure is outputted to the air pressure chamber 62 through the reference pressure fourth port 32. It can be seen that in the calibration mode, all outputs of the 32-channel pressure-sweep valve are a uniform result: the differential pressure between the calibration pressure and the reference pressure.
In this embodiment, the differential pressure type central air pressure transmission module, the housing 7 and the cover plate 8 are made of aluminum alloy. The pressure sensitive chip 61 is a differential pressure type MEMS pressure sensor.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. The utility model provides a be applied to 32 passageway pressure scanning valve's differential pressure formula center atmospheric pressure transmission module, differential pressure formula center atmospheric pressure transmission module is cubic structure, its characterized in that: 32 independent test pressure transmission channels (1), reference pressure first transmission channels (2), reference pressure second transmission channels (3) and calibration pressure transmission channels (4) are arranged in the differential pressure type central air pressure transmission module, and the differential pressure type central air pressure transmission module supports two working modes, namely a normal pressure measurement mode and a calibration mode;
and the middle part above the differential pressure type central air pressure transmission module is provided with a manual mode switching through hole (5).
2. The differential pressure type central air pressure transmission module applied to the 32-channel pressure scanning valve according to claim 1, wherein: the ports at the two ends of the pressure testing and testing transmission channel (1) are respectively a first port (11) and a second port (12) for testing pressure; the pressure measurement and test first ports (11) are 32 and used for inputting test air pressure, half of the 32 pressure measurement and test first ports (11) are arranged at the left part of the upper surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows, and the other half of the 32 pressure measurement and test first ports (11) are arranged at the right part of the upper surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows and 4; the number of the second pressure testing ports (12) is 32, the second pressure testing ports are used for outputting testing air pressure, half of the 32 second pressure testing ports (12) are arranged on the left parts of the front side surface and the rear side surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows, and the other half of the 32 second pressure testing ports (12) are arranged on the right parts of the front side surface and the rear side surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows and 4 rows; the 32 test pressure first ports (11) and the 32 test pressure second ports (12) are respectively communicated one by one to form 32 independent test pressure transmission channels (1).
3. The differential pressure type central air pressure transmission module applied to the 32-channel pressure scanning valve according to claim 2, wherein: the ports at the two ends of the reference pressure first transmission channel (2) are a reference pressure first port (21) and a reference pressure second port (22) respectively; the number of the reference pressure first ports (21) is 1, the reference pressure first ports can be used for inputting reference air pressure in a normal pressure measuring mode, and the 1 reference pressure first port (21) is arranged on the upper surface of the differential pressure type central air pressure transmission module and is positioned between the left part of first port (11) of the pressure measuring and testing and the right part of first port (11) of the pressure measuring and testing; the number of the reference pressure second ports (22) is 4, the reference pressure second ports can be used for outputting reference air pressure in a normal pressure measurement mode, 2 of the 4 reference pressure second ports (22) are arranged on the front side face of the differential pressure type central air pressure transmission module and are positioned between the left part pressure measurement second port (12) and the right part pressure measurement second port (12) of the front side face, and the other 2 of the 4 reference pressure second ports (22) are arranged on the rear side face of the differential pressure type central air pressure transmission module and are positioned between the left part pressure measurement second port (12) and the right part pressure measurement second port (12) of the rear side face; 1 reference pressure first port (21) and 4 reference pressure second ports (22) are communicated to form a reference pressure first transmission channel (2); the reference pressure first transmission channel (2) is inoperative in a calibration mode.
4. The differential pressure type central air pressure transmission module applied to the 32-channel pressure scanning valve according to claim 3, wherein: the ports at the two ends of the reference pressure second transmission channel (3) are a reference pressure third port (31) and a reference pressure fourth port (32) respectively; the number of the reference pressure third ports (31) is 1, the reference pressure third ports can be used for inputting reference air pressure in a calibration mode, and the 1 reference pressure third port (31) is arranged on the upper surface of the differential pressure type central air pressure transmission module and is positioned between the left part of first port (11) of the test pressure and the right part of first port (11) of the test pressure; the number of the reference pressure fourth ports (32) is 4, and the reference pressure fourth ports can be used for outputting reference air pressure in a calibration mode, 2 of the 4 reference pressure fourth ports (32) are arranged on the front side face of the differential pressure type central air pressure transmission module and are positioned between the left part of the front side face of the second port (12) for pressure measurement and the right part of the second port (12) for pressure measurement and the other 2 of the 4 reference pressure fourth ports (32) are arranged on the rear side face of the differential pressure type central air pressure transmission module and are positioned between the left part of the rear side face of the second port (12) for pressure measurement and the right part of the second port (12) for pressure measurement; the 1 reference pressure third port (31) and the 4 reference pressure fourth ports (32) are communicated to form a reference pressure second transmission channel (3); the reference pressure second transmission channel (3) does not work in a normal pressure measuring mode.
5. The differential pressure type central air pressure transmission module applied to the 32-channel pressure scanning valve according to claim 4, wherein: the 4 reference pressure second ports (22) and the 4 reference pressure fourth ports (32) are arranged in parallel in the horizontal direction, and each reference pressure second port (22) is 2.5mm away from the reference pressure fourth port (32) in the same horizontal direction; the maximum distance that the differential pressure type central air pressure transmission module is arranged in the valve body of the pressure scanning valve and can be pushed is 2.5 mm.
6. The differential pressure type central air pressure transmission module applied to the 32-channel pressure scanning valve according to claim 5, wherein: the ports at the two ends of the calibration transmission channel (4) are respectively a calibration pressure first port (41) and a calibration pressure second port (42); the number of the first calibration pressure ports (41) is 1, and the first calibration pressure ports can be used for inputting calibration air pressure in a calibration mode, and the 1 first calibration pressure port (41) is arranged on the upper surface of the differential pressure type central air pressure transmission module and is positioned between the first left part pressure test port (11) and the first right part pressure test port (11); the number of the second calibration pressure ports (42) is 32, the second calibration pressure ports can be used for outputting calibration air pressure in a calibration working mode, half of the 32 second calibration pressure ports (42) are arranged at the left parts of the front side surface and the rear side surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows, and the other half of the 32 second calibration pressure ports (42) are arranged at the right parts of the front side surface and the rear side surface of the differential pressure type central air pressure transmission module and are arranged in 4 rows and 4 rows; the 1 calibration pressure first port (41) and the 32 calibration pressure second ports (42) are communicated to form a calibration pressure transmission channel (4); the calibration pressure transmission channel (4) does not work in a normal pressure measurement mode.
7. The differential pressure type central air pressure transmission module applied to the 32-channel pressure scanning valve according to claim 6, wherein: the 32 pressure testing second ports (12) and the 32 calibration pressure second ports (42) are horizontally arranged at intervals on the front side surface or the rear side surface of the differential pressure type central air pressure transmission module, and each pressure testing second port (12) is 2.5mm away from the calibration pressure second port (42) in the same horizontal direction; the maximum distance that the differential pressure type central air pressure transmission module is arranged in the valve body of the pressure scanning valve and can be pushed is 2.5 mm.
8. The differential pressure type central air pressure transmission module applied to the 32-channel pressure scanning valve according to claim 7, wherein: the side surface of the differential pressure type central air pressure transmission module is provided with a calibration pressure process hole (43) used for processing the calibration transmission channel (4), and the calibration pressure process hole (43) is blocked by glue.
9. A pressure scanning valve, characterized by: the pressure scanning valve comprises a pressure scanning valve body and a differential pressure type central air pressure transmission module applied to a 32-channel pressure scanning valve according to any one of claims 1 to 8, wherein the differential pressure type central air pressure transmission module is arranged in the pressure scanning valve body.
10. A pressure scanning valve, characterized by: the pressure scanning valve comprises a pressure scanning valve body and a differential pressure type central air pressure transmission module applied to a 32-channel pressure scanning valve according to claim 8, wherein the differential pressure type central air pressure transmission module is arranged in the pressure scanning valve body;
the pressure scanning valve body comprises a pressure sensing assembly, a cover plate assembly and a pressurizing piston (9);
the number of the pressure sensing assemblies is 4, and each pressure sensing assembly consists of a first PCB (63), 8 pressure-sensitive chips (61) arranged on the first PCB (63) and an air pressure chamber (62) formed by the inner cavity of the pressure sensing assembly and the shell; 2 pressure sensing assemblies are arranged at the front end of the pressure scanning valve body in an up-down side-by-side manner, and the other 2 pressure sensing assemblies are arranged at the rear end of the pressure scanning valve body in an up-down side-by-side manner; the pressure-sensitive chip (61) is a differential pressure type MEMS pressure sensor, the front surface of the pressure-sensitive chip (61) shares reference pressure in an air pressure chamber (62), the back surface of the pressure-sensitive chip (61) has two conditions, test air pressure is input through a test pressure transmission channel (1) of the module in a normal pressure measurement mode, and calibration air pressure is input through a calibration pressure transmission channel (4) of the module in a calibration mode;
the cover plate assembly consists of a cover plate (8) arranged at the upper end of the valve body of the pressure scanning valve, a cover plate pressure measurement and test air guide needle nozzle (81) arranged on the cover plate (8), a cover plate reference pressure first air guide needle nozzle (82), a cover plate reference pressure second air guide needle nozzle (83), a cover plate calibration pressure air guide needle nozzle (84) and a cover plate pressure charging piston air guide needle nozzle (85);
the number of the pressurizing pistons (9) is 2, and the pressurizing pistons are respectively arranged on the left side and the right side of the valve body of the pressure scanning valve; 2 pressurizing pistons (9) are connected with cover plate pressurizing piston air guide needle nozzles (85); when the pressurizing piston (9) at one side is pressurized, the pressurizing piston (9) at the other side is depressurized, a pushing effect to the other side force exists on the differential pressure type central air pressure transmission module, the differential pressure type central air pressure transmission module is displaced by 2.5mm in the pressure scanning valve body relative to the horizontal direction, and the two positions respectively correspond to two working modes, namely a normal pressure measuring mode and a calibration mode;
in a normal pressure measuring mode, the cover plate pressure measuring and testing air guide needle nozzle (81) is hermetically connected with the pressure measuring and testing first port (11) and used for inputting test air pressure, and the input test air pressure is output to the back of the pressure-sensitive chip (61) from the test pressure second port (12) through the test pressure transmission channel (1); in a normal pressure measuring mode, the cover plate is hermetically connected with the first reference pressure air guide needle nozzle (82) and the first reference pressure port (21) and used for inputting reference air pressure, and the input reference air pressure is output to the air pressure chamber (62) of the pressure sensing assembly (6) from the second reference pressure port (22) through the first reference pressure transmission channel (2); under a normal pressure measuring mode, the 32-channel pressure scanning valve outputs pressure difference of pressure measuring and reference pressure of 32 channels;
in a calibration mode, the pressurizing piston (9) has a force pushing effect on a differential pressure type central air pressure transmission module, the differential pressure type central air pressure transmission module is displaced by 2.5mm in a pressure scanning valve body relative to a normal pressure measurement mode, the cover plate calibration pressure air guide needle nozzle (84) is in sealing connection with the calibration pressure first port (41) and is used for inputting calibration air pressure, and the input calibration air pressure is output to the back of the pressure-sensitive chip (61) through the calibration pressure second port (42); in the calibration mode, the cover plate reference pressure second air guide needle nozzle (83) is in sealing connection with the reference pressure third port (31) and is used for inputting reference air pressure, and the input reference air pressure is output to the air pressure chamber (62) through the reference pressure fourth port (32); in the calibration mode, all of the outputs of the 32-channel pressure sweep valve are differential pressures of the calibration pressure and the reference pressure.
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