A calibration device for pressure sensors suitable for different temperature conditions

Abstract

This invention discloses a calibration device for pressure sensors suitable for different temperature conditions, comprising a support frame, an experimental platform fixedly mounted at the top of the support frame, a medium-temperature oil tank at one end of the top of the experimental platform, and a constant-temperature oil tank at the end of the top of the experimental platform away from the medium-temperature oil tank, a medium-temperature oil cup at one end of the top of the experimental platform adjacent to the medium-temperature oil tank, and a constant-temperature oil cup at one end of the top of the experimental platform adjacent to the constant-temperature oil tank, and U-shaped tubes installed on both sides of the experimental platform, with four-way connectors at the bottom of each U-shaped tube. This invention achieves simulation of two temperature environments through the dual-cavity oil tank structure of the medium-temperature and constant-temperature oil tanks. Compared to water tanks, the medium-temperature and constant-temperature oil tanks have a wider temperature control range, using high-temperature silicone oil as the medium, achieving a maximum constant temperature control of 350℃. The medium-temperature and constant-temperature oil tanks also feature rapid heating, stable temperature, and good uniformity.

Description

Technical Field

[0001] This invention belongs to the field of pressure sensor calibration equipment, and particularly relates to a calibration device for pressure sensors suitable for different temperature conditions. Background Technology

[0002] The engine integrated test bench has 18 pressure sensors, each with a different application environment. These mainly involve: monitoring diesel pressure (0-1.6 MPa, 35-160°C); monitoring engine oil pressure (0-1 MPa, 80-120°C); pressure before intercooler (0-600 kPa, 120-160°C); and pressure after intercooler (0-600 kPa, 40-80°C).

[0003] Current pressure sensor calibration equipment mostly uses a water-based constant-temperature medium, which can only reach a maximum temperature of 100°C under standard atmospheric pressure, failing to meet the calibration requirements of engine integrated test benches. Therefore, to solve the above problems, we provide a calibration device for pressure sensors suitable for different temperature conditions. Summary of the Invention

[0004] This invention aims to solve the problem that most current pressure sensor calibration devices use water-based constant temperature media, which can only reach a maximum temperature of 100°C under standard atmospheric pressure, thus failing to meet the calibration requirements of engine integrated test benches.

[0005] This invention is implemented as follows: a calibration device for pressure sensors suitable for different temperature conditions includes a support frame, an experimental platform fixedly mounted at the top of the support frame, a medium-temperature oil tank at one end of the top of the experimental platform, a constant-temperature oil tank at the end of the top of the experimental platform away from the medium-temperature oil tank, a medium-temperature oil cup at one end of the top of the experimental platform on the side of the medium-temperature oil tank, and a constant-temperature oil cup at one end of the top of the experimental platform on the side of the constant-temperature oil tank. U-shaped tubes are installed on the outside of the experimental platform on both the side of the medium-temperature oil tank and the side of the constant-temperature oil tank. A four-way connector is provided at the bottom of each U-shaped tube, and a heat insulation mechanism is provided between the four-way connectors. An oil tank control panel is provided on the outside of the experimental platform.

[0006] Preferably, the U-tube includes a sensor under test, a standard sensor, a medium-temperature section, and a constant-temperature section. The sensor under test is provided at the top of the U-tube on the outer side of the medium-temperature oil tank, the standard sensor is provided at the top of the U-tube on the outer side of the constant-temperature oil tank, the medium-temperature section 13 is provided on the outer side of the U-tube on the outer side of the medium-temperature oil tank, and the constant-temperature section is provided on the outer side of the U-tube on the outer side of the constant-temperature oil tank.

[0007] Preferably, the heat insulation mechanism includes a heat insulation section, a heat insulation piston, and a piston column. A heat insulation section is provided on each of the opposite sides of the four-way valve, and a heat insulation piston is provided at the end of each heat insulation section away from the four-way valve. A piston column is provided between the ends of the heat insulation pistons away from the heat insulation sections.

[0008] Preferably, the medium-temperature oil cup is connected to the medium-temperature oil tank via a transmission pipe.

[0009] Preferably, the constant temperature oil cup is connected to the constant temperature oil bath via a transmission pipe.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] The dual-chamber oil tank structure, consisting of a medium-temperature oil tank and a constant-temperature oil tank, simulates two different temperature environments. Compared to a water tank, the medium-temperature and constant-temperature oil tanks have a wider temperature control range. Using high-temperature silicone oil as the medium, the maximum temperature can be controlled at 350℃. The medium-temperature and constant-temperature oil tanks also feature rapid heating, stable temperature, and good uniformity. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a calibration device for pressure sensors applicable to different temperature conditions according to the present invention;

[0013] Figure 2 This is a schematic diagram of a U-shaped tube structure for a calibration device of a pressure sensor suitable for different temperature conditions according to the present invention.

[0014] In the diagram: 1. Support; 2. Experimental table; 3. Medium-temperature oil bath; 4. Constant-temperature oil bath; 5. Medium-temperature oil cup; 6. Constant-temperature oil cup; 7. U-shaped tube; 8. Four-way connector; 9. Heat insulation mechanism; 10. Oil bath control panel; 11. Sensor under test; 12. Standard sensor; 13. Medium-temperature section; 14. Constant-temperature section; 15. Heat insulation section; 16. Heat-insulated piston; 17. Piston column. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0016] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0017] Please see Figure 1-2 A calibration device for pressure sensors suitable for different temperature conditions includes a bracket 1. An experimental platform 2 is fixedly installed at the top of the bracket 1. A medium-temperature oil tank 3 is opened at one end of the top of the experimental platform 2, and a constant-temperature oil tank 4 is opened at the end of the top of the experimental platform 2 away from the medium-temperature oil tank 3. A medium-temperature oil cup 5 is installed on one side of the medium-temperature oil tank 3 at one end of the top of the experimental platform 2, and a constant-temperature oil cup 6 is installed on one side of the constant-temperature oil tank 4 at one end of the top of the experimental platform 2. U-shaped tubes 7 are installed on both sides of the medium-temperature oil tank 3 and the constant-temperature oil tank 4 on the outside of the experimental platform 2. A four-way connector 8 is provided at the bottom end of each U-shaped tube 7. A heat insulation mechanism 9 is provided between the four-way connectors 8. An oil tank control panel 10 is provided on one side of the outside of the experimental platform 2.

[0018] The U-tube 7 described in this invention includes a sensor under test 11, a standard sensor 12, a medium-temperature section 13, and a constant-temperature section 14. The sensor under test 11 is disposed on the top of the U-tube 7 on the outer side of the medium-temperature oil tank 3, and the standard sensor 12 is disposed on the top of the U-tube 7 on the outer side of the constant-temperature oil tank 4. The medium-temperature section 13 is disposed on the outer side of the U-tube 7 on the outer side of the medium-temperature oil tank 3, and the constant-temperature section 14 is disposed on the outer side of the U-tube 7 on the outer side of the constant-temperature oil tank 4. The pressure sensor is calibrated by using the U-tube 7 to calibrate the sensor under test 11 and the standard sensor 12 respectively. The medium-temperature section 13 and the constant-temperature section 14 are used to ensure the temperature environment of the sensor under test 11 and the standard sensor 12.

[0019] The heat insulation mechanism 9 of this invention includes a heat insulation section 15, a heat insulation piston 16, and a piston column 17. A heat insulation section 15 is provided on each of the opposite sides of the four-way valve 8. A heat insulation piston 16 is provided at the end of each heat insulation section 15 away from the four-way valve 8. A piston column 17 is provided between the ends of the heat insulation pistons 16 away from the heat insulation sections 15. The heat insulation mechanism 9 is designed to prevent heat conduction and further ensure the temperature environment of the sensor under test 11 and the standard sensor 12.

[0020] In this invention, the medium-temperature oil cup 5 is connected to the medium-temperature oil tank 3 via a transmission pipe.

[0021] In this invention, the constant temperature oil cup 6 is connected to the constant temperature oil tank 4 through a transmission pipe.

[0022] The working principle of this invention is as follows: Based on the measurement range of pressure and temperature parameters of the integrated experimental platform 2, and considering the problems existing in current calibration methods, to complete the calibration of pressure parameters, it is necessary to simultaneously create two working environments with different temperatures. One is the temperature environment simulating the working state of the pressure sensor, i.e., the different temperature conditions when the pressure sensor is working; the other is the standard temperature environment of the pressure standard when calibrating the pressure sensor in the laboratory, i.e., a temperature environment of 20±3℃. The simulation of these two temperature environments is achieved through the dual-chamber oil tank structure of the medium-temperature oil tank 3 and the constant-temperature oil tank 4. Compared to a water tank, the medium-temperature oil tank 3 and the constant-temperature oil tank 4 have a wider temperature control range. Using high-temperature silicone oil as the medium, their maximum temperature can achieve constant temperature control of 350℃. The constant temperature oil bath 4 features rapid heating, stable temperature, and good uniformity. The temperature of the medium temperature oil bath 3 and the constant temperature oil bath 4 can be controlled separately through the oil bath control panel 10. The constant temperature oil bath 4 can be cooled and heated, allowing the pressure standard to operate within the specified temperature range. The medium temperature oil bath 3 can be heated to simulate the actual operating temperature of the sensor under test 11, thereby enabling the calibration of the pressure sensor. The sensor under test 11 is the pressure sensor being measured, and the standard sensor 12 is the pressure sensor for comparison. The medium temperature section 13 and the constant temperature section 14 are used to ensure the temperature environment of the sensor under test 11 and the standard sensor 12. The heat insulation mechanism 9 is set to prevent heat conduction, further ensuring the temperature environment of the sensor under test 11 and the standard sensor 12.

[0023] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A calibration device for pressure sensors suitable for use in different temperature conditions, comprising a support (1), characterized in that: The support (1) top fixedly provided with experiment table (2), the experiment table (2) top one end is provided with medium temperature oil groove (3), the experiment table (2) top is away from medium temperature oil groove (3) one end and is provided with constant temperature oil groove (4), the experiment table (2) top one end is provided with medium temperature oil cup (5) in medium temperature oil groove (3) one side, the experiment table (2) top one end is provided with constant temperature oil cup (6) in constant temperature oil groove (4) one side, the experiment table (2) outside in medium temperature oil groove (3), constant temperature oil groove (4) one side is installed with U-shaped pipe (7), the U-shaped pipe (7) bottom is provided with four-way (8), the four-way (8) between is provided with heat insulation mechanism (9), the experiment table (2) outside one side is provided with oil groove control panel (10); The U-shaped pipe (7) includes measured sensor (11), standard sensor (12), medium temperature section (13) and constant temperature section (14), the medium temperature oil groove (3) outside one side is provided with measured sensor (11) in U-shaped pipe (7) top, the constant temperature oil groove (4) outside one side is provided with standard sensor (12) in U-shaped pipe (7) top, the medium temperature oil groove (3) outside one side is provided with medium temperature section 13 in U-shaped pipe (7) outside, the constant temperature oil groove (4) outside one side is provided with constant temperature section (14) in U-shaped pipe (7) outside; The heat insulation mechanism (9) includes heat insulation section (15), heat insulation piston (16) and piston column (17), the opposite side of four-way (8) is provided with heat insulation section (15), the heat insulation section (15) is provided with heat insulation piston (16) away from four-way (8) one end, the heat insulation piston (16) is provided with piston column (17) in.

2. The calibration device for pressure sensors applicable under different temperature conditions according to claim 1, characterized in that: The medium temperature oil cup (5) is communicated with medium temperature oil groove (3) through transmission pipe.

3. The calibration device for pressure sensors applicable under different temperature conditions according to claim 1, characterized in that: The constant temperature oil cup (6) is communicated with constant temperature oil groove (4) through transmission pipe.

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