CN115326270A - High-temperature-resistant pressure sensor with capillary tube with water cooling structure - Google Patents
High-temperature-resistant pressure sensor with capillary tube with water cooling structure Download PDFInfo
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- CN115326270A CN115326270A CN202210899511.6A CN202210899511A CN115326270A CN 115326270 A CN115326270 A CN 115326270A CN 202210899511 A CN202210899511 A CN 202210899511A CN 115326270 A CN115326270 A CN 115326270A
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- water
- pressure
- capillary tube
- pressure sensor
- cooling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/06—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of piezo-resistive devices
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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
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0681—Protection against excessive heat
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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
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- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention designs a high-temperature-resistant pressure sensor with a capillary tube water-cooling structure, which comprises a pressure leading head, a pressure-bearing diaphragm, a plug, a diaphragm end cover, a capillary tube, a core end cover, a base, a sensitive element, a conversion circuit, a shell, a wire outlet end, an output lead and a water-cooling shell.
Description
Technical Field
The invention relates to a high-temperature-resistant pressure sensor with a capillary tube with a water cooling structure, and belongs to the technical field of engine development.
Background
In order to verify the performance parameters of the engine in the development process, pressure data inside the combustion chamber is generally obtained in a combustion chamber pressure-leading measurement mode in an engine ground thermal test, and various performance parameters of the engine are evaluated through analysis of the pressure data.
The attitude and orbit control engine has high response speed and high combustion chamber temperature, and in order to acquire accurate pressure data inside the combustion chamber in a pulse working state, a sensing element of a traditional pressure sensor is directly contacted with hot gas, and high-temperature gas is accumulated in a pressure measuring cavity when the engine works in a pulse mode, so that the sensing element is easily subjected to permanent deformation in a high-temperature environment, effective combustion chamber pressure data cannot be acquired, and performance evaluation of the engine is influenced. According to the related reports of the high temperature resistant room pressure engine test technology in the countries such as the United states, russia, european Bureau and the like, the similar structural data is not found. The domestic literature has no relevant report.
Disclosure of Invention
The technical problem solved by the invention is as follows: aiming at the problems existing in the prior art under the technical pulse working state of the traditional attitude and orbit control engine, the high-temperature-resistant pressure sensor with the capillary tube water-cooling structure is provided.
The technical scheme for solving the technical problems is as follows:
the high-temperature-resistant pressure sensor with the capillary tube water-cooling structure comprises a pressure leading head, a pressure-bearing diaphragm, a plug, a diaphragm end cover, a capillary tube, a core end cover, a base, a sensitive element, a conversion circuit, a shell, a wire outlet end, an output lead and a water-cooling shell, wherein the pressure leading head, the core end cover and the shell are all welded in the water-cooling shell, one end of the pressure leading head is connected with a pressure measuring interface of an engine through a mechanical interface, the pressure-bearing diaphragm is arranged in the pressure leading head, the plug is arranged on the back pressure side of the pressure-bearing diaphragm, sealing is realized in a steel ball mode, the other end of the pressure leading head is provided with the diaphragm end cover, one end of the capillary tube penetrates through the diaphragm end cover to be connected onto the pressure-bearing diaphragm, the other end of the capillary tube penetrates through the core end cover to be connected onto the sensitive element, one end of the base is provided with the end cover, the sensitive element is arranged in the base, the sensitive element is connected with the conversion circuit, the wire outlet end is arranged on the shell of the base, and the conversion circuit is connected with an external data collector through the output lead which penetrates out the wire.
The pressure-bearing diaphragm is in contact with high-temperature gas output by a pressure measuring interface of the engine to generate deformation, the pressure-bearing diaphragm transmits the deformation to the sensitive element through silicone oil filled in the capillary tube, the sensitive element generates deformation to change the resistance value of the bridge circuit, the conversion circuit analyzes the variable of the resistance value of the bridge circuit and generates a current signal, and the current signal is sent to the data acquisition unit through an output wire in a wire outlet end to acquire gas pressure information in a thrust chamber of the engine.
The water-cooling shell is characterized in that a water inlet interface and a water outlet interface are arranged on the water-cooling shell, cooling medium flows into the water inlet interface to cool the pressure sensor consisting of the pressure guide head, the capillary tube and the shell in the water-cooling shell, and the cooling medium is discharged from the water outlet interface.
And a capillary pressure guiding pipe is arranged in the capillary pipe to prevent the sensitive element from overheating and losing efficacy.
A hollow area is designed between the water-cooling shell body and the pressure sensor, cooling media are drained, and the pressure sensor is physically cooled to maintain the stable work of the pressure sensor.
The sensitive element adopts a diffused silicon pressure core body, and can adapt to a conversion circuit to convert a pressure signal into an electric signal.
In the water-cooling shell, the inner side of the water inlet interface is provided with an annular radiating fin for increasing the contact area of the cooling medium and the outer wall of a radiating device consisting of a pressure guide head, a pressed diaphragm, a plug and a diaphragm end cover so as to improve the heat exchange efficiency.
The capillary is filled with silicone oil in a vacuum pumping mode.
The water-cooling shell body is made of stainless steel materials and is welded with the pressure sensor through an argon arc welding technology.
The water inlet interface and the water outlet interface are arranged at the axial symmetry positions of the upper side and the lower side of the water-cooling shell body, and are simultaneously provided with two sealing rings for sealing.
Compared with the prior art, the invention has the advantages that:
(1) According to the high-temperature-resistant pressure sensor with the water-cooling structure for the capillary tube, the sensitive element of the pressure sensor is arranged at the rear end of the capillary tube and is far away from the high-temperature gas pressure sensing surface, so that the direct influence of high-temperature gas on the sensitive element can be effectively isolated, the sensitive element is prevented from being influenced by high-temperature heat transfer to cause signal failure, the measurement accuracy of the sensor is improved, and the service life of the sensor is prolonged;
(2) The invention can effectively relieve the problems of sensor signal drift and sensitive element failure caused by overhigh temperature in the pulse working process of the engine, and the like, and ensures the reliability and the effectiveness of pressure data of the combustion chamber in the ground test process of the engine;
(3) The capillary structure adopted by the invention ensures effective transmission of pressure intensity by filling the silicon oil medium which is the same as the diffused silicon sensitive element, has good natural frequency characteristic in a pulse working mode, has dynamic response frequency higher than 1kHz through dynamic calibration and test verification, and can ensure accurate acquisition of the internal pressure of the thrust chamber under pulse working of an engine.
Drawings
FIG. 1 is an exploded view of a pressure sensor according to the present invention;
FIG. 2 is a schematic diagram of a sensor structure provided by the invention;
FIG. 3 is a schematic diagram of the main body of the pressure sensor provided by the present invention;
FIG. 4 is a schematic view of a water-cooled housing according to the present invention;
FIG. 5 is a schematic structural view of a heat dissipation device according to the present invention;
Detailed Description
The utility model provides a capillary zone water-cooling structure's high temperature resistant pressure sensor, mainly comprises pressure sensor main part and water-cooling shell two parts, still is provided with heat abstractor, under the prerequisite that satisfies dynamic properties, improves pressure sensor's bearing capacity under the high temperature state, controls the ambient temperature of sensing element under engine operating condition, guarantees sensing element output pressure signal's accuracy and reliability, effectively improves the life of sensor under high temperature environment, specifically does:
the pressure sensor main body is a core component for acquiring medium pressure, mainly realizes acquisition of dynamic pressure signals of a measured medium, effective isolation of high-temperature fuel gas and conversion and transmission of the pressure signals, and is a main component for ensuring accurate and reliable acquisition of pressure data. The water-cooling shell body has a cooling medium drainage function, so that the heat exchange function of the cooling medium and the pressure sensor main body is realized, the temperature of the outer surface of the pressure sensor main body can be effectively reduced, the physical characteristics of a metal material are ensured, and the validity and the stability of the test data of the pressure sensor are effectively improved.
The pressure sensor main body is a core device of a pressure sensor and comprises a pressure leading head, a pressed diaphragm, a plug, a diaphragm end cover, a capillary tube, a core end cover, a base, a sensitive element, a conversion circuit, a shell, a wire outlet end and an output lead, wherein high-temperature fuel gas is conveyed to the pressed diaphragm through a pressure leading cavity, the drift diameter of the pressure leading cavity is 2mm, in order to ensure the deformation stability of the pressed diaphragm, a heat dissipation device consisting of the pressure leading head, the pressed diaphragm, the plug and the diaphragm end cover is used as a first temperature control measure to physically cool the high-temperature fuel gas and the pressed diaphragm in the pressure leading cavity, so that the temperature resistance of the pressed diaphragm is effectively improved, meanwhile, the capillary tube adopts a silicone oil filling mode, the pressure intensity sensed by the pressed diaphragm can be accurately transmitted to a pressure sensing end of the sensitive element, the sensitive element adopts a diffused silicon pressure core, and a corresponding conversion circuit is configured, so that a pressure signal can be accurately converted into an electric signal and the electric signal is transmitted to a collection device through the output lead.
The following further description is made with reference to the accompanying drawings and specific examples:
as shown in figures 1 and 2, the high-temperature-resistant pressure sensor with the capillary tube water-cooling structure comprises a pressure sensor main body and a water-cooling shell body, wherein:
the pressure sensor main body is shown in fig. 3 and comprises a pressure leading head 1, a pressed diaphragm 2, a plug 3, a diaphragm end cover 4, a capillary tube 5, a base 7, silicon oil 8, a sensing element 9, a conversion circuit 10, a shell 11, a wire outlet end 12 and an output lead 13, wherein the pressure sensor main body is designed and processed by adopting 316 stainless steel materials, the sensing element adopts a diffused silicon pressure sensing core body, the pressure grade is 40MPa, the designed length of the capillary tube is 40mm, the inner diameter of the capillary tube is 2mm, and silicon oil is filled in the capillary tube to serve as a transmission medium of pressure at two ends. The capillary tube is welded with the pressed diaphragm and the sensitive element in an argon arc welding mode, silicone oil is filled in the capillary tube in a vacuumizing mode after welding is finished, and plugging is carried out after filling is finished, so that effective isolation of fuel gas and the sensitive element can be realized, the influence of the fuel gas temperature on the sensitive element is eliminated, and the requirement of a pressure sensor on testing dynamic response can be fully met by filling silicone oil in the capillary tube.
The schematic structural diagram of the water-cooling shell is shown in fig. 4, and the water-cooling shell comprises a shell 14, a water inlet 15 and a water outlet 16, the water-cooling shell is designed and processed by using 304 stainless steel materials, the wall thickness is 1.5mm, the water-cooling shell is welded with a pressure sensor main body by using an argon arc welding technology, and the highest pressure resistance is 1MPa. The cooling interface adopts argon arc welding mode to weld with water-cooling shell, and interface length 12mm, internal diameter 3mm, external diameter 6mm set up twice sealing ring, connection and fixed conveying water pipe that can be good.
The heat dissipation device adopts a mode of increasing the heat dissipation area, two annular cooling fins with the thickness of 1.5mm are designed on the cooling water inlet pressure sensor main body, the contact area of cooling water and the outer wall of the pressure leading cavity is increased, the heat exchange efficiency of the heat dissipation device is improved, the temperature of high-temperature gas in the pressure leading cavity is fully reduced, the stability of the physical characteristics of the pressed diaphragm is ensured, the service life of the pressed diaphragm is prolonged, and the schematic diagram of the heat dissipation device is shown in figure 5.
The capillary tube is used as a core design component of the sensor, can effectively isolate the influence of high-temperature fuel gas on a sensitive element on the premise of ensuring the dynamic characteristic of the pressure sensor, and has a certain impact resistance effect at the same time, the capillary tube adopts a vacuum pumping and silicone oil filling mode, and the schematic diagram is shown as serial numbers 2, 3, 5, 8 and 9 in figure 3.
The product of the invention is adopted, and the results of multiple times of work examination under the ground hot test of a single engine and different pulse programs show that the capillary tube belt water cooling structure can effectively reduce the influence of the gas temperature on the measurement data of the sensor and prolong the service life of the sensitive element of the sensor.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Those skilled in the art will appreciate that the details of the invention not described in detail in this specification are well within the skill of those in the art.
Claims (10)
1. The utility model provides a capillary takes high temperature resistant pressure sensor of water-cooling structure which characterized in that includes:
the pressure leading head (1), the pressure receiving diaphragm (2), the plug (3), the diaphragm end cover (4), the capillary tube (5), the core end cover (6), the base (7), the sensitive element (9), the conversion circuit (10), the shell (11), the wire outlet end (12), the output lead (13) and the water-cooling shell (14), wherein the pressure leading head (1), the core end cover (6) and the shell (11) are all welded in the water-cooling shell (14), one end of the pressure leading head (1) is connected with a pressure measuring interface of an engine through a mechanical interface, the pressure receiving diaphragm (2) is arranged in the pressure leading head (1), the plug (3) is arranged on the back pressure side of the pressure receiving diaphragm (2) and sealed in a steel ball form, the diaphragm end cover (4) is arranged at the other end of the pressure leading head (1), one end of the capillary tube (5) penetrates through the diaphragm end cover (4) to be connected to the pressure receiving diaphragm (2), the other end of the capillary tube (5) penetrates through the core end cover (6) to be connected to the sensitive element (9), one end of the base (7) is provided with the end cover, the base (7), the sensitive element (9) is arranged in the base (7), the wire outlet end cover (12) is arranged in the conversion circuit (10), the conversion circuit (10) is connected with an external data acquisition unit through an output lead (13) penetrating out of the outlet end (12).
2. The high-temperature-resistant pressure sensor with the water-cooling structure for the capillary tube according to claim 1, wherein:
the pressure-bearing diaphragm (2) is in contact with high-temperature gas output by an engine pressure measuring interface to generate deformation, the pressure-bearing diaphragm (2) transmits the deformation to the sensing element (9) through silicon oil (8) filled in the capillary (5), the sensing element (9) generates deformation to change the resistance value of the bridge circuit, the conversion circuit (10) analyzes the variable of the resistance value of the bridge circuit and generates a current signal, and the current signal is sent to the data acquisition unit through an output wire (13) in the outlet end (12) to acquire gas pressure information in a thrust chamber of the engine.
3. The high-temperature-resistant pressure sensor with the water-cooling structure for the capillary tube according to claim 1, wherein:
the water-cooling shell body (14) is provided with a water inlet connector (15) and a water outlet connector (16), a cooling medium flows into the water inlet connector (15) to cool a pressure sensor consisting of the pressure guide head (1), the capillary tube (5) and the shell body (11) in the water-cooling shell body (14), and the cooling medium is discharged from the water outlet connector (16).
4. The high-temperature-resistant pressure sensor with the water-cooling structure for the capillary tube as claimed in claim 2, wherein:
and a capillary pressure guiding pipe is arranged in the capillary (5) to prevent the sensitive element (9) from overheating and failing.
5. The high-temperature-resistant pressure sensor with the water-cooling structure for the capillary tube as claimed in claim 3, wherein:
a hollow area is designed between the water-cooling shell body (14) and the pressure sensor, so that cooling media are drained, and the pressure sensor is physically cooled to maintain the stable work of the pressure sensor.
6. The high-temperature-resistant pressure sensor with the water-cooling structure for the capillary tube according to claim 1, wherein:
the sensitive element (9) adopts a diffused silicon pressure core body, and can adapt to the conversion circuit (10) to convert a pressure signal into an electric signal.
7. The high-temperature-resistant pressure sensor with the water-cooling structure for the capillary tube as claimed in claim 3, wherein:
in water-cooling shell casing (14), water inlet interface (15) inboard is provided with cyclic annular fin for increase coolant and draw the heat abstractor's that pressure head (1), pressurized membrane (2), shutoff (3), diaphragm end cover (4) are constituteed outer wall area of contact, in order to realize heat exchange efficiency's improvement.
8. The high-temperature-resistant pressure sensor with the water-cooling structure for the capillary tube as claimed in claim 2, wherein:
the capillary tube (5) is filled with silicone oil (8) in a vacuum pumping mode.
9. The high temperature resistant pressure sensor of capillary tube with water cooling structure as claimed in claim 7, wherein:
the water-cooling shell body (14) is made of 304 stainless steel materials and is welded with the pressure sensor through an argon arc welding technology.
10. The high temperature resistant pressure sensor of capillary tube with water cooling structure as claimed in claim 7, wherein:
the water inlet connector (15) and the water outlet connector (16) are arranged at the axial symmetrical positions of the upper side and the lower side of the water-cooling shell body (14), and are simultaneously provided with two sealing rings for sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210899511.6A CN115326270A (en) | 2022-07-28 | 2022-07-28 | High-temperature-resistant pressure sensor with capillary tube with water cooling structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210899511.6A CN115326270A (en) | 2022-07-28 | 2022-07-28 | High-temperature-resistant pressure sensor with capillary tube with water cooling structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115326270A true CN115326270A (en) | 2022-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210899511.6A Pending CN115326270A (en) | 2022-07-28 | 2022-07-28 | High-temperature-resistant pressure sensor with capillary tube with water cooling structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115326270A (en) |
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2022
- 2022-07-28 CN CN202210899511.6A patent/CN115326270A/en active Pending
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