CN217179726U - Calibration device of liquid level sensor - Google Patents
Calibration device of liquid level sensor Download PDFInfo
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- CN217179726U CN217179726U CN202122743666.4U CN202122743666U CN217179726U CN 217179726 U CN217179726 U CN 217179726U CN 202122743666 U CN202122743666 U CN 202122743666U CN 217179726 U CN217179726 U CN 217179726U
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Abstract
The utility model relates to the technical field of liquid level sensor calibration equipment, and discloses a calibration device of a liquid level sensor, which is used for calibrating the liquid level sensor and comprises a calibration oil tank, a temperature control component, an overflow pipeline, a circulation pipeline and an auxiliary oil tank; the calibration oil tank is connected with the temperature control assembly; an overflow port is formed in the upper portion of the side wall of the calibration oil tank and is communicated with the auxiliary oil tank through an overflow pipeline; the bottom of the side wall of the calibration oil tank is provided with a circulation port, and the circulation port is communicated with the auxiliary oil tank through a circulation pipeline; temperature control unit installs on the calibration oil tank, the utility model has the advantages of invariable calibration oil tank liquid level, reduction calibration error source improve the calibration accuracy.
Description
Technical Field
The utility model relates to a technical field of level sensor calibration equipment, specific saying so, a level sensor's calibrating device for the precision to level sensor calibrates. .
Background
With the development of science and technology, renewable energy is more and more widely applied to the transportation industry, but due to the great volatility of renewable energy, fuel still occupies the dominant position for supplying energy to large transportation equipment. During long-distance navigation, the oil quantity is generally measured by a liquid level sensor, so that the problems of residual oil quantity, residual voyage and the like of equipment are estimated.
In order to fully utilize the space of the transportation equipment, a designer usually reserves the installation position of the functional equipment firstly, and then designs the fuel tank into a special-shaped fuel tank for filling the rest space, so that the fuel storage capacity is maximized while the functional requirements are met. But the arrangement of the special-shaped oil tank provides higher challenge for the measurement accuracy of the fuel sensor.
The fuel sensor is mainly structurally a double-layer or multi-layer metal tube, alternating current signals with different polarities are applied between different metal layers, and a capacitor is formed between two electrodes corresponding to the metal layers. Taking a sensor with a two-layer metal tube structure as an example, the capacitance value is represented as:
wherein L is the length of the metal tube, a is the inner diameter of the outer metal tube, b is the outer diameter of the inner metal tube, has a vacuum dielectric constant of 8.85417817 × 10 -12 F/m, the relative dielectric constant of the material between the two metal tubes.
Therefore, in the use process, the oil immersion height of the liquid level sensor changes to cause the dielectric constant between the metal pipes to change, so that the output capacitance value changes.
Theoretically, the liquid level sensors installed at the same position have the best consistency if the precision is completely consistent, but in actual production, the precision of the liquid level sensors of the same type has certain fluctuation due to machining errors, raw material deviation, operation errors and the like. Therefore, the factors causing the output capacitance value of the liquid level sensor to change include not only the change of the dielectric constant but also the deviation of the accuracy of the metal tube, the error of the test equipment, and the like. In order to ensure the consistency of liquid level sensors of the same model, designers need to calibrate and test the liquid level sensors, and ensure that the output capacitance precision errors of the liquid level sensors at different oil immersion heights are small enough.
Because the temperature variation of the test fuel can lead to the test fuel expanding with heat and contracting with cold, therefore, when the same oil mass is calibrated at different temperatures, the capacitance values output by the liquid level sensor are different.
The traditional liquid calibration test method is to install a liquid level sensor at the top of a calibration oil tank and control an oil filling valve to fill oil into the calibration oil tank according to the set oil level height. Due to the problems of time delay of valve control, overflow of residual oil in a pipeline and the like, the oil level height in the calibrated oil tank often has large deviation with a preset value, so that the consistency of the calibrated liquid level sensor is not ideal; meanwhile, temperature control measures are not taken for test fuel in the traditional liquid level sensor calibration, so that the results of the same liquid level sensor in different seasons are different after calibration, the judgment of research personnel on the actual consistency of the liquid level sensor is influenced, and the positioning of the installation faults is inaccurate.
In addition, the conventional calibration fuel tank has the problem that fuel is easily polluted, the dielectric constant of the polluted calibration liquid becomes undesirable, the accuracy of liquid calibration is further reduced, and therefore the waste of the calibration liquid is serious.
SUMMERY OF THE UTILITY MODEL
To the defect that foretell prior art exists, the utility model aims to provide a calibrating device of level sensor, calibrating device's liquid level remains invariable throughout, carries out a plurality of errors that the level sensor calibration effectively avoided causing because of factors such as test temperature, valve precision, pipeline oil residue with this calibrating device and introduces and the accumulation, and the displacement precision error that exists when only introducing level sensor in the testing process descends has significantly reduced the error source, has effectively improved the calibration accuracy.
The utility model discloses a following technical scheme realizes:
a calibration device of a liquid level sensor is used for calibrating the liquid level sensor and comprises a calibration oil tank, a temperature control assembly, an overflow pipeline, a circulating pipeline and an auxiliary oil tank;
an overflow port is formed in the upper portion of the side wall of the calibration oil tank and is communicated with the auxiliary oil tank through an overflow pipeline;
the bottom of the side wall of the calibration oil tank is provided with a circulation port, and the circulation port is communicated with the auxiliary oil tank through a circulation pipeline;
the temperature control assembly is mounted on the calibration oil tank;
the temperature control assembly comprises a temperature sensor, a temperature controller, a heating device and a refrigerating device;
The temperature sensor is arranged in the calibration oil tank, the temperature sensor is connected with the temperature controller, and the temperature controller is respectively connected with the heating device and the refrigerating device.
In order to better realize the utility model discloses, furtherly, the oil feed end of overflow pipeline with the overflow mouth is put through mutually, the overflow pipeline communicates in proper order on the road has overflow valve and first filter, the end of producing oil of overflow pipeline with the auxiliary oil tank intercommunication.
In order to better realize the utility model discloses, furtherly, circulation pipeline's oil feed end with the auxiliary fuel tank intercommunication, be equipped with oil pump, second filter and check valve on the circulation pipeline in proper order, circulation pipeline's play oil end with the circulation mouth intercommunication.
In order to realize better the utility model discloses, furtherly, the level is equipped with the filter screen in the calibration oil tank, the border of filter screen with the inner wall contact of calibration oil tank, still hang on the border of filter screen and be equipped with the couple. The bottom of couple with the border of filter screen is connected, just the top of couple hang in the lateral wall top of calibration oil tank.
In order to better realize the utility model discloses, furtherly, the auxiliary fuel tank includes the circulation district and the storage area that the mutual separation set up, overflow pipeline's play oil end with the storage area intercommunication, circulation pipeline's oil inlet end with circulation district intercommunication, the circulation district with through the intercommunication pipeline intercommunication between the storage area, communicating pipe is equipped with the intercommunication valve on the road.
In order to better realize the utility model discloses, furtherly, the circulation mouth still through first oil discharge pipeline with circulation district intercommunication, the oil feed end on first oil discharge pipeline with the circulation mouth switch-on, first oil discharge pipeline installs first oil discharge valve on the road, the oil end on first oil discharge pipeline with the circulation district switch-on.
In order to better realize the utility model discloses, furtherly, the lateral wall bottom of auxiliary fuel tank still is equipped with the second and unloads oil pipe way, the oil inlet end on second unload oil pipe way with circulation district intercommunication, the second unloads oil pipe and installs the second valve that unloads oil on the road, the second unloads oil pipe way produce oil end and auxiliary fuel tank's outside intercommunication.
In order to better realize the utility model discloses, furtherly, the calibration oil tank still includes the top cap, demountable installation has the top cap on the open-top of calibration oil tank.
In order to better realize the utility model, the utility model further comprises a microcontroller; the microcontroller is respectively and electrically connected with a temperature controller of the temperature control assembly, an oil pump of the circulating pipeline, a one-way valve on the circulating pipeline, an overflow valve on the overflow pipeline, a communicating valve in the auxiliary oil tank, a first oil unloading valve arranged on the first oil unloading pipeline and a second oil unloading valve arranged on the second oil unloading pipeline on the auxiliary oil tank.
Compared with the prior art, the utility model, have following advantage and beneficial effect:
the utility model provides a calibrating device carries out the multiple error introduction and the accumulation that liquid level sensor calibration effectively avoided causing because of factors such as test temperature, valve precision, pipeline oil residue, only introduces the displacement precision error that exists when liquid level sensor descends in the testing process, and the error source that has significantly reduced has effectively improved the calibration accuracy.
Drawings
The technical solutions described below will be clearly and completely described with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a calibration apparatus for a liquid level sensor according to the present invention;
fig. 2 is a schematic diagram of the connection between the microcontroller and each component of the calibration device according to the present invention.
Wherein: 1. calibrating the oil tank; 11. an overflow port; 111. an overflow line; 112. an overflow valve; 113. a first filter; 12. a circulation port; 121. a circulation line; 122. an oil pump; 123. a second filter; 124. a one-way valve; 125. a first oil discharge pipeline; 126. a first oil drain valve; 13. a filter screen; 14. hooking; 15. a top cover; 2. an auxiliary oil tank; 21. a circulation zone; 22. a storage area; 23. a second oil discharge pipeline; 24. a second oil drain valve; 25. a communicating pipeline; 26. a communication valve; 3. a temperature control assembly; 31. a temperature sensor; 32. a temperature controller; 33. a heating device; 34. a refrigeration device; 4. a microcontroller.
Detailed Description
The invention will be described in further detail with reference to the following detailed description of illustrative embodiments. This should not be understood as limiting the scope of the above-described subject matter of the present invention to the following examples only. Various substitutions and alterations can be made according to the ordinary skill in the art and the conventional means without departing from the technical idea of the invention.
Example 1:
the calibration device of the liquid level sensor of the present embodiment, as shown in fig. 1, is used for calibrating the liquid level sensor, and includes a calibration oil tank 1, a temperature control assembly 3, an overflow pipeline 111, a circulation pipeline 121, and an auxiliary oil tank 2;
an overflow port 11 is formed in the upper part of the side wall of the calibration oil tank 1, and the overflow port 11 is communicated with the auxiliary oil tank 2 through an overflow pipeline 111;
a circulation port 12 is formed in the bottom of the side wall of the calibration oil tank 1, and the circulation port 12 is communicated with the auxiliary oil tank 2 through a circulation pipeline 121;
the calibration oil tank 1 is connected with the temperature control component 3.
In the calibration process, the test fuel pump 122 in the auxiliary fuel tank 2 is fed into the calibration fuel tank 1 through the circulating pipeline 121, the liquid level of the test fuel in the calibration fuel tank 1 continuously rises until the liquid level exceeds the overflow port 11, and redundant test fuel is collected into the auxiliary fuel tank 2 through the overflow port 11 and the overflow pipeline 111, so that the cyclic utilization of the test fuel is controlled, and the highest liquid level in the calibration fuel tank 1 is always constant; simultaneously, carry out real-time accurate monitoring to the temperature in the calibration oil tank 1 through temperature control component 3 to adjust the oil temperature in the calibration oil tank 1 through temperature control component 3, reduce the temperature and cause the interference to level sensor's calibration precision.
The temperature control assembly 3 comprises a temperature sensor 31, a temperature controller 32, a heating device 33 and a refrigerating device 34;
the temperature sensor 31 is arranged inside the calibration oil tank 1, the temperature sensor 31 is connected with the temperature controller 32, and the temperature controller 32 is respectively connected with the heating device 33 and the refrigerating device 34.
The temperature sensor 31 is also arranged in the auxiliary oil 2 and on the circulating pipeline 121, and the temperature controller 32 reads the temperature values of the temperature sensor 31 in the calibration oil tank 1, the temperature sensor 31 in the auxiliary oil tank 2 and the temperature sensor 31 on the circulating pipeline 121; the temperature controller 32 is further configured to set a desired temperature value, and control the start, stop, and power adjustment of all the heating devices 33 and the cooling devices 34 according to the read temperature value, so as to regulate and control the temperature of the test fuel. The setting, adjustment and reading of the temperature values may be performed simultaneously for all the temperature sensors 31, or may be performed individually for the temperature sensors 31 in one device as required.
When measuring the oil temperature in the calibration oil tank 1 or the auxiliary oil tank 2, the oil temperature may be determined by averaging the measurement values of the plurality of temperature sensors 31. When the measured value of the individual temperature sensor 31 differs from that of the other temperature sensors 31 by more than 5 ℃, the measured value of the temperature sensor 31 is discarded, the temperature sensor 31 is marked as abnormal, the measured results of the other temperature sensors 31 are used for averaging, and the calibration test is completed. The temperature sensor 31 marked as faulty is tested, repaired or replaced after the test.
In order to ensure a uniform fuel temperature in the calibration tank 1, the heating device 33, the circulation line 121 and the overflow line 111 may be activated in advance to allow a sufficient flow of liquid in the calibration tank 1.
Example 2:
in this embodiment, a further optimization is performed on the basis of embodiment 1, as shown in fig. 1, an oil inlet end of the overflow pipeline 111 is communicated with the overflow port 11, an overflow valve 112 and a first filter 113 are sequentially communicated with the overflow pipeline 111, and an oil outlet end of the overflow pipeline 111 is communicated with the auxiliary oil tank 2.
The overflow valve 112 on the overflow pipeline 111 can be closed when needed, and the overflow pipeline 111 is blocked, so that the liquid level in the calibration oil tank 1 can continuously rise; the first filter 113 installed on the overflow line 111 can filter the fuel flowing through, remove impurities falling into the fuel, and recycle the impurities into the auxiliary fuel tank 2, thereby reducing the influence of the impurities in the fuel on the calibration accuracy of the liquid level sensor during reuse.
The oil inlet end of the circulation pipeline 121 is communicated with the auxiliary oil tank 2, the circulation pipeline 121 is sequentially provided with an oil pump 122, a second filter 123 and a one-way valve 124, and the oil outlet end of the circulation pipeline 121 is communicated with the circulation port 12.
Test fuel in the auxiliary fuel tank 2 is pumped into the calibration fuel tank 1 through the oil pump 122 in the circulating pipeline 121, the auxiliary fuel tank 2 is used as a supply fuel tank, and when the test fuel is inevitably lost due to liquid volatilization, test piece wetting and the like, the fuel in the calibration fuel tank 1 is continuously supplied; the second filter 123 filters the fuel in the auxiliary fuel tank 2 again, further reducing the influence of impurities on the calibration accuracy of the level sensor. The circulation line 121 is provided with a check valve 124, the oil pump 122 is naturally communicated when opened, and the circulation line 121 is cut off when the oil pump 122 is closed, so that the fuel in the calibration fuel tank 1 is prevented from flowing into the auxiliary fuel tank 2 through the circulation line 121.
A filter screen 13 is horizontally arranged in the calibration oil tank 1, and the filter screen 13 is installed on the calibration oil tank 1 through a hook 14. The border of filter screen 13 with the inner wall contact of calibration oil tank 1, the bottom of couple 14 is connected with the border of filter screen 13, just the top of couple 14 hang in the lateral wall top of calibration oil tank 1. The filter screen 13 can be used for fishing the objects and impurities carelessly falling into the calibration oil tank 1 in the experimental process, so that the purity of the fuel oil in the calibration oil tank 1 is further improved, and the influence of the impurities on the calibration precision is weakened.
The inner cavity of the auxiliary oil tank 2 is divided into a circulation area 21 and a storage area 22, the circulation area 21 is communicated with the storage area 22 through a communication pipeline 25, and a communication valve 26 is arranged on the communication pipeline 25. The on-off of the communication pipeline 25 is controlled between the circulation area 21 and the storage area 22 through a communication valve 26. The oil outlet end of the overflow line 111 communicates with the storage area 22. The oil inlet end of the circulation line 121 communicates with the circulation zone 21.
The reservoir 22 is used to provide additional volume storage space for fuel that overflows the calibration tank 1. After a plurality of test fuel losses and volatilization, pumping all the fuel in the circulation zone 21 into the calibration fuel tank 1, and when the calibration fuel tank 1 still cannot reach the height of the overflow port 11, opening the communication valve 26 on the communication pipeline 25, and introducing the fuel in the storage zone 22 into the circulation zone 21 to replenish the fuel in the calibration fuel tank 1 until the liquid level of the calibration fuel tank 1 reaches the height of the overflow port 11.
The circulation port 12 is further communicated with the circulation zone 21 through a first oil unloading pipeline 125, an oil inlet end of the first oil unloading pipeline 125 is communicated with the circulation port 12, a first oil unloading valve 126 is installed on the first oil unloading pipeline 125, and an oil outlet end of the first oil unloading pipeline 125 is communicated with the circulation zone 21.
During the test, when the fuel level in the calibration fuel tank 1 needs to be adjusted, the fuel in the calibration fuel tank 1 is discharged into the circulation zone 21 by opening the fuel discharge valve on the first fuel discharge line 125.
Furthermore, a second oil discharge pipeline 23 is further arranged at the bottom of the side wall of the auxiliary oil tank 2, an oil inlet end of the second oil discharge pipeline 23 is communicated with the circulation area 21, a second oil discharge valve 24 is mounted on the second oil discharge pipeline 23, and an oil outlet end of the second oil discharge pipeline 23 is communicated with the outside of the auxiliary oil tank 2.
When the calibration oil tank 1, the auxiliary oil tank 2, the overflow pipeline 111, the circulating pipeline 121 and the like need to be cleaned and overhauled, the second oil unloading valve 24 can be controlled to be communicated, and part or all of the test fuel in the device can be discharged from the second oil unloading pipeline 23, so that the cleaning or overhauling condition is achieved.
The calibration oil tank 1 further comprises a top cover 15, and the top cover 15 is detachably mounted on the top opening of the calibration oil tank 1.
When not carrying out level sensor calibration test, top cap 15 covers establishes on the open-top of calibration oil tank 1, reduces the volatile loss of experimental fuel in the calibration oil tank 1, avoids impurity to fall into in the calibration oil tank 1 carelessly simultaneously.
As shown in fig. 2, a microcontroller 4 is also included; the microcontroller 4 is electrically connected to the temperature controller 32 of the temperature control unit 3, the oil pump 122 of the circulation line 121, the check valve 124 of the circulation line 121, the relief valve 112 of the relief line 111, the communication valve 26 of the auxiliary oil tank 2, the first oil drain valve 126 mounted on the first oil drain line 125, and the second oil drain valve 24 mounted on the second oil drain line 23 of the auxiliary oil tank 2.
The temperature controller 32, the oil pump 122 and valves of all pipelines are controlled by the microcontroller 4, and the liquid level and the temperature of the calibration oil tank 1 are jointly adjusted and controlled by the microcontroller 4, so that the operation steps are reduced, and the test efficiency and the test precision are improved.
The conventional test fuel in the calibration fuel tank 1 or the auxiliary fuel tank 2 is RP3 or JETA aviation kerosene, or the conventional fuel is replaced by the calibration liquid meeting the MIL-PRF-7024 standard. The substitute liquid has the same dielectric constant as aviation fuel oil, and the density and other properties of the substitute liquid are more stable, safe and environment-friendly.
Taking a liquid level sensor with the length of 500mm as an example, the oil immersion depths to be calibrated are respectively 0mm, 100mm, 300mm, 400mm and 480 mm. Therefore, the test fuel is filled into the calibration fuel tank 1 for 5 times to complete the calibration of the 5 oil-immersed points.
In a traditional liquid calibration method, a calibration oil tank 1 is usually a transparent oil tank, when the oil tank is empty, a calibrated sensor is installed at the top of the oil tank, test fuel oil is filled into the oil tank through a control valve after a test is started, and calibration of a plurality of scales is completed from bottom to top. Because the immersion oil degree of depth receives valve control accuracy, pipeline residual oil etc. to influence, the error of liquid level during calibration reaches 5mm even, has seriously influenced the accuracy of liquid level calibration result.
Adopt this embodiment calibrating device when carrying out calibration test to the level sensor that length is 500mm, at first ensure the test fuel liquid level in the calibration oil tank 1 and balance all the time at 11 heights in the overflow mouth, follow the level sensor from last down falling in proper order, make level sensor's immersion depth stop in proper order at 0mm, 100mm, 300mm, 400mm, 480mm to corresponding calibration point at each immersion depth calibrates. When the calibration device provided by the embodiment is used for testing, parameters of the calibration precision only have the movement precision of the liquid level sensor, and are not influenced by valve control precision, pipeline residual oil and the like, so that the source of influencing factors is reduced, and the calibration precision of the liquid level sensor is improved.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
The above, only be the preferred embodiment of the present invention, it is not right the utility model discloses do the restriction in any form, all be according to the utility model discloses a technical entity is any simple modification, the equivalent change of doing to above embodiment, all fall into within the protection scope of the utility model.
Claims (9)
1. The utility model provides a calibrating device of level sensor for calibrate level sensor, its characterized in that: the device comprises a calibration oil tank (1), a temperature control assembly (3), an overflow pipeline (111), a circulating pipeline (121) and an auxiliary oil tank (2);
an overflow port (11) is formed in the upper portion of the side wall of the calibration oil tank (1), and the overflow port (11) is communicated with the auxiliary oil tank (2) through an overflow pipeline (111);
the bottom of the side wall of the calibration oil tank (1) is provided with a circulation port (12), and the circulation port (12) is communicated with the auxiliary oil tank (2) through a circulation pipeline (121);
the temperature control component (3) comprises a temperature sensor (31), a temperature controller (32), a heating device (33) and a refrigerating device (34);
temperature sensor (31) set up in inside calibration oil tank (1), temperature sensor (31) with temperature controller (32) are connected, temperature controller (32) are connected respectively heating device (33), refrigerating plant (34).
2. The calibration device for a liquid level sensor according to claim 1, wherein: the oil inlet end of the overflow pipeline (111) is communicated with the overflow port (11), the overflow pipeline (111) is sequentially communicated with an overflow valve (112) and a first filter (113), and the oil outlet end of the overflow pipeline (111) is communicated with the auxiliary oil tank (2).
3. The calibration device for a liquid level sensor according to claim 1, wherein: the oil inlet end of the circulating pipeline (121) is communicated with the auxiliary oil tank (2), the circulating pipeline (121) is sequentially provided with an oil pump (122), a second filter and a one-way valve (124), and the oil outlet end of the circulating pipeline (121) is communicated with the circulating port (12).
4. The calibration device for a liquid level sensor according to claim 1, wherein: the level is equipped with filter screen (13) in calibration oil tank (1), the border of filter screen (13) with the inner wall contact of calibration oil tank (1), still hang on the border of filter screen (13) and be equipped with couple (14), the top of couple (14) hang in the lateral wall top of calibration oil tank (1).
5. The calibration device for a liquid level sensor according to claim 1, wherein: the auxiliary oil tank (2) comprises a circulation area (21) and a storage area (22) which are arranged in a mutually separated mode, the oil outlet end of the overflow pipeline (111) is communicated with the storage area (22), the oil inlet end of the circulation pipeline (121) is communicated with the circulation area (21), the circulation area (21) is communicated with the storage area (22) through a communication pipeline (25), and a communication valve (26) is arranged on the communication pipeline (25).
6. A device for calibrating a liquid level sensor according to claim 5, wherein: the circulation mouth (12) through first oil discharge pipeline (125) with circulation district (21) intercommunication, the oil inlet end of first oil discharge pipeline (125) with circulation mouth (12) switch-on, install first oil discharge valve (126) on the first oil discharge pipeline (125), the oil outlet end of first oil discharge pipeline (125) with circulation district (21) switch-on.
7. The calibration device for a liquid level sensor according to claim 6, wherein: the lateral wall bottom of supplementary oil tank (2) still is equipped with second oil discharge pipeline (23), the oil inlet end of second oil discharge pipeline (23) with circulation district (21) intercommunication, install second oil discharge valve (24) on second oil discharge pipeline (23), the outside intercommunication of the end of producing oil and supplementary oil tank (2) of second oil discharge pipeline (23).
8. A device for calibrating a liquid level sensor according to any one of claims 1 to 7, wherein: a top cover (15) is detachably mounted on the top opening of the calibration oil tank (1).
9. A device for calibrating a liquid level sensor according to any one of claims 1 to 7, wherein: also comprises a microcontroller (4); the microcontroller (4) is electrically connected with a temperature controller (32) of the temperature control assembly (3), an oil pump (122) of the circulating pipeline (121), a one-way valve (124) on the circulating pipeline (121), an overflow valve (112) on the overflow pipeline (111), a communication valve (26) in the auxiliary oil tank (2), a first oil unloading valve (126) installed on the first oil unloading pipeline (125), and a second oil unloading valve (24) installed on the second oil unloading pipeline (23) on the auxiliary oil tank (2).
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| CN113932892A (en) * | 2021-11-10 | 2022-01-14 | 四川泛华航空仪表电器有限公司 | Calibration test equipment and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113932892A (en) * | 2021-11-10 | 2022-01-14 | 四川泛华航空仪表电器有限公司 | Calibration test equipment and application thereof |
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