Fuel flow sensor

Abstract

The invention relates to the technical field of flow sensors, and discloses a fuel flow sensor which comprises a shell assembly, a support is installed in the middle of the shell assembly, a first bearing is fixedly connected to the inner side of the support, and a turbine shaft is installed in the first bearing. An outer sealing sleeve for limiting the first bearing is installed at the rear end of the turbine shaft in a matched mode through threads, a first turbine is installed at the front end of the turbine shaft through a nut, and a second bearing is installed in the middle of the turbine shaft in a sleeved mode. According to the fuel flow sensor, the first turbine and the second turbine are installed in the shell assembly, the second turbine is arranged at the rear end of the first turbine, when oil flows, the first turbine and the second turbine are sequentially driven by the oil to rotate, the detection accuracy can be improved through a dual detection mode, and the detection efficiency is improved. And the rotating speed difference between the first turbine and the second turbine is observed, so that the detection structure can be accurately limited, and the detection accuracy of the detection structure is ensured.

Description

Technical Field

[0001] The present invention relates to the field of flow sensors, and in particular to a fuel flow sensor. Background Art

[0002] Fuel flow measurement technology has important applications in aviation, automotive, and industrial sectors. Its accuracy and reliability directly impact fuel efficiency and system performance. Fuel flow sensors are flow measurement instruments based on the principles of fluid dynamics and electromagnetic induction, primarily used to measure the flow rate and total volume of liquids. They are widely used in the petroleum, chemical, metallurgical, and scientific research industries. Turbine flow sensors equipped with sanitary connectors can also be used in the pharmaceutical industry.

[0003] At present, common fuel flow measurement technologies include single-turbine flowmeters, volumetric flowmeters, and mass flowmeters. Single-turbine flowmeters are widely used due to their simple structure and low cost, but their measurement accuracy and range are limited, especially under low and high flow conditions, where errors are large. Although volumetric flowmeters have high accuracy, they have complex structures and are easily affected by changes in fuel viscosity. Although mass flowmeters can directly measure mass flow, they are expensive and have strict requirements on installation conditions. Therefore, we have proposed a fuel flow sensor. Summary of the Invention

[0004] In response to the shortcomings of existing flow sensors, the present invention provides a fuel flow sensor that has the advantages of improving measurement accuracy, expanding the measuring range, improving fault detection capabilities and reducing pressure loss and fuel pump consumption through dual-turbine redundant design, thereby solving the problems raised in the above-mentioned background technology.

[0005] The present invention provides the following technical solution: a fuel flow sensor, comprising a housing assembly, a bracket installed in the middle of the housing assembly, a first bearing fixedly connected to the inner side of the bracket, a turbine shaft installed inside the first bearing, a rear end thread of the turbine shaft is matched with an outer sealing sleeve for limiting the first bearing, a first turbine installed at the front end of the turbine shaft through a nut, a second bearing sleeved and installed in the middle of the turbine shaft, a second turbine sleeved and installed on the outside of the second bearing, a connecting plate installed at the rear end of the second turbine, a detection plate fixedly connected to the rear end of the outer ring of the second bearing, an opening opened on the outside of the housing assembly, a mounting plate installed inside the opening, a sensor mounting seat installed inside the mounting plate, two sets of traction rods fixedly connected to the lower end of the sensor mounting seat, the traction rods pass through the interior of the mounting plate, and a sensor is installed inside the sensor mounting seat.

[0006] Preferably, the first bearing includes a first bearing outer ring, a first bearing ball and a first bearing inner ring, the first bearing outer ring and the turbine shaft are matched with each other, and the bracket is fixed to the outside of the turbine shaft, and the second bearing includes a second bearing inner ring, a second bearing ball and a second bearing outer ring, the second bearing inner ring and the turbine shaft are matched with each other, and the second turbine is fixed to the outside of the second bearing outer ring.

[0007] Preferably, the connecting plate is installed between the first bearing and the second bearing, and an end portion of the connecting plate is fixed to the outside of the outer ring of the first bearing.

[0008] Preferably, a feed pipe and a discharge pipe are sequentially installed at both ends of the shell assembly, the feed pipe is connected to the oil feed pipe, the discharge pipe is connected to the oil outlet pipe, and a spiral groove is opened inside the discharge pipe.

[0009] Preferably, the lower end of the traction rod is fixedly connected with two sets of outer sleeves, and the two sets of outer sleeves are sequentially sleeved on the outside of the detection plate and the outer sealing sleeve.

[0010] Preferably, the sensor includes a speed sensor and a phase difference detection circuit, which are installed inside the sensor mounting seat. The lower end of the speed sensor is fixedly connected to a detection probe, which is installed inside the traction rod.

[0011] Preferably, a jacket for limiting the position of the mounting plate is installed on the outside of the shell assembly, and a sealing gasket is installed at the connection between the mounting plate and the shell assembly.

[0012] Preferably, the first turbine is arranged at the front end of the second turbine, and the blades inside the first turbine and the second turbine are staggered with each other.

[0013] A method for operating a fuel flow sensor, the specific operating steps are as follows: S1: Connect the feed pipe and the discharge pipe to the pipeline, and install sealing gaskets at the connection; S2: Power on the phase difference detection circuit and the speed sensor to complete the sensor self-test; S3: Start the oil pipe valve. After the fuel flows into the interior of the housing assembly, observe whether the first turbine and the second turbine rotate smoothly. The calibration procedure corrects the flow rate. S4: The rotation speeds of the outer sealing sleeve and the detection plate are detected by the detection probes to ensure that the two sets of detection probes detect the rotation speeds of the first turbine and the second turbine, and the signal detection relationship curve is detected by the speed sensor and the phase difference detection circuit.

[0014] In summary, the present invention has the following beneficial effects: 1. The fuel flow sensor is installed inside the housing assembly through the first and second turbines, with the second turbine located at the rear end of the first turbine. When oil flows, the oil drives the first and second turbines to rotate in sequence. This dual detection method improves detection accuracy, and by observing the speed difference between the first and second turbines, the detection structure can be precisely defined to ensure its detection accuracy.

[0015] 2. The fuel flow sensor is sequentially mounted on the exterior of the outer sealing sleeve and the detection plate via two sets of outer sleeves. The detection probe installed inside the sensor mounting base can sequentially detect the rotational speeds of the first turbine and the second turbine. With the assistance of the first and second bearings, there is no interference between the two, and the friction component is reduced, avoiding the impact of friction resistance on the detection structure, thereby improving detection efficiency.

[0016] 3. This fuel flow sensor improves measurement accuracy and expands the measuring range through dual detection of the first turbine and the second turbine. The dual-turbine redundant design improves fault detection capabilities. At the same time, a spiral groove is opened inside the discharge pipe. When the oil flows into the spiral groove, it can be accelerated, reducing pressure loss and reducing fuel pump consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic cross-sectional structural diagram of the main body of the present invention; Figure 3 This is an enlarged structural diagram of the turbine assembly of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the turbine of the present invention; Figure 5 This is a schematic diagram of the partially enlarged structure of the sensor of the present invention.

[0018] Description of reference numerals: 1. Housing assembly; 2. Feed pipe; 3. Discharge pipe; 4. Bracket; 5. First bearing outer ring; 6. First bearing ball; 7. First bearing inner ring; 8. Turbine shaft; 9. Outer sealing sleeve; 10. First turbine; 11. Nut; 12. Second bearing inner ring; 13. Second bearing ball; 14. Second bearing outer ring; 15. Second turbine; 16. Connecting plate; 17. Detection plate; 18. Mounting plate; 19. Jacket; 20. Drawbar; 21. Outer sleeve; 22. Sensor mounting base; 23. Detection probe; 24. Speed ​​sensor; 25. Phase difference detection circuit. DETAILED DESCRIPTION

[0019] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 A fuel flow sensor includes a housing assembly 1, a bracket 4 is installed in the middle of the housing assembly 1, and a first bearing is fixedly connected to the inner side of the bracket 4. The first bearing is installed on the outside of the turbine shaft 8. When the turbine shaft 8 rotates, it does not interfere with the position of the bracket 4. At the same time, the bracket 4 drives the device to adjust its position inside the housing assembly 1. The turbine shaft 8 is installed inside the first bearing. The rear end thread of the turbine shaft 8 is equipped with an outer sealing sleeve 9 for limiting the first bearing. The outer sleeve 21 is sleeved on the outside of the outer sealing sleeve 9 to ensure that the sensor mounting seat 22 is installed on the upper part of the outer sealing sleeve 9. At the same time, the detection probe 23 can detect the rotation speed of the outer sealing sleeve 9. The front end of the turbine shaft 8 is installed with a first turbine 10 through a nut 11. When the oil enters the first turbine 10, the first turbine 10 can rotate. The middle part of the turbine shaft 8 is sleeved with a second bearing, and the second bearing is arranged on the inner side of the second turbine 15 When the second turbine 15 rotates, the second bearing reduces the friction resistance of the second turbine 15 during rotation. The second turbine 15 is installed on the outer sleeve of the second bearing. A connecting plate 16 is installed at the rear end of the second turbine 15. The connecting plate 16 is installed between the two sets of bearings to seal the bearings. The rear end of the second bearing outer ring 14 is fixedly connected with a detection plate 17. An opening is opened on the outside of the housing assembly 1, and a mounting plate 18 is installed inside the opening. The mounting plate 18 is installed inside the housing assembly 1. The position of the mounting plate 18 can be installed and limited. A sensor mounting seat 22 is installed inside the mounting plate 18. The lower end of the sensor mounting seat 22 is fixedly connected to two sets of traction rods 20. The traction rods 20 pass through the inside of the mounting plate 18. A sensor is installed inside the sensor mounting seat 22. The sensor contacts the outer sealing sleeve 9 and the detection plate 17 in sequence. The sensor can detect the rotational speed of the detection plate 17 and the outer sealing sleeve 9.

[0021] See also Figure 4The first bearing includes a first bearing outer ring 5, a first bearing ball 6 and a first bearing inner ring 7. The first bearing outer ring 5 is matched with the turbine shaft 8 and the bracket 4 is fixed to the outside of the turbine shaft 8. The second bearing includes a second bearing inner ring 12, a second bearing ball 13 and a second bearing outer ring 14. The second bearing inner ring 12 is matched with the turbine shaft 8 and the second turbine 15 is fixed to the outside of the second bearing outer ring 14. By installing the first bearing and the second bearing on the outside of the turbine shaft 8, when the oil flows, the first turbine 10 is driven to rotate, and the first turbine 10 drives the turbine When the shaft 8 rotates, the first bearing can reduce the friction resistance to prevent the resistance from interfering with the circulation of the first turbine 10. At the same time, a second turbine 15 is installed on the outside of the second bearing. The second bearing reduces the friction resistance between the outer ring 14 of the second bearing and the turbine shaft 8, that is, the second turbine 15 does not rotate synchronously with the rotation of the turbine shaft 8, and when the oil passes through the second turbine 15, the second turbine 15 rotates synchronously. Then, after the rotation efficiency of the first turbine 10 and the second turbine 15 is detected by the sensor, the speed difference or phase difference is observed at the same time, and then the flow rate of the oil can be accurately detected.

[0022] See also Figure 4 The connecting plate 16 is installed between the first bearing and the second bearing, and the end of the connecting plate 16 is fixed to the outside of the first bearing outer ring 5. The connecting plate 16 is arranged between the first bearing and the second bearing, that is, the connecting plate 16 adjusts the distance between the first bearing and the second bearing. At the same time, some of the two ends of the connecting plate 16 are fixed to the outside of the second bearing inner ring 12 and the first bearing outer ring 5, that is, to ensure that the rotation of the turbine shaft 8 does not interfere with the second turbine 15, and the connecting plate 16 seals the first bearing and the second bearing to prevent oil from entering the connection, which affects the rotation efficiency.

[0023] See also Figure 2 The two ends of the housing assembly 1 are successively equipped with a feed pipe 2 and a discharge pipe 3. The feed pipe 2 is connected to the oil feed pipe, and the discharge pipe 3 is connected to the oil discharge pipe. A spiral groove is provided inside the discharge pipe 3. By connecting the feed pipe 2 and the discharge pipe 3 to the oil pipe, the oil is transported to the interior of the housing assembly 1 through the feed pipe 2 and discharged through the discharge pipe 3 again. At the same time, a spiral groove is provided inside the discharge pipe 3. When the oil passes through the discharge pipe 3, the oil can be discharged through the discharge pipe 3 at an accelerated rate, effectively avoiding the phenomenon of the oil passing through the sensor and causing deceleration, thereby effectively reducing the fuel pump consumption.

[0024] See also Figure 1The lower end of the traction rod 20 is fixedly connected with two sets of outer sleeves 21, and the two sets of outer sleeves 21 are sequentially sleeved on the outside of the detection plate 17 and the outer sealing sleeve 9. The outer sleeves 21 are driven by the traction rod 20 to be sleeved on the outside of the detection plate 17 and the outer sealing sleeve 9, wherein the detection plate 17 rotates synchronously with the second turbine 15, and the outer sealing sleeve 9 rotates synchronously with the first turbine 10, and then the detection probes 23 installed inside the two sets of outer sleeves 21 detect the rotation speed to improve the detection efficiency.

[0025] See also Figure 5 The sensor includes a speed sensor 24 and a phase difference detection circuit 25. The speed sensor 24 and the phase difference detection circuit 25 are installed inside the sensor mounting base 22. The lower end of the speed sensor 24 is fixedly connected to a detection probe 23, and the detection probe 23 is installed inside the traction rod 20. The speed sensor 24 and the phase difference detection circuit 25 are installed inside the sensor mounting base 22. At the same time, the lower end of the speed sensor 24 is installed with a detection probe 23, and the detection probe 23 is installed inside the traction rod 20. At the same time, the detection probe 23 can detect the speed of the first turbine 10 and the second turbine 15, and transmit the detection information to the inside of the phase difference detection circuit. The phase difference detection circuit can accurately detect the speed and speed difference of the first turbine 10 and the second turbine 15. The accuracy of flow rate detection is improved through double detection.

[0026] See also Figure 1 A jacket 19 is installed on the outside of the shell assembly 1 to limit the position of the mounting plate 18. A sealing gasket is installed at the connection between the mounting plate 18 and the shell assembly 1. The mounting plate 18 is installed inside the shell assembly 1. At the same time, a jacket 19 is installed on the outside of the mounting plate 18. The jacket 19 drives the mounting plate 18 to be spliced ​​and limited at the position outside the shell assembly 1, and a sealing gasket is installed between the connections. The sealing gasket improves the stability of the mounting plate 18 when it is installed inside the shell assembly 1.

[0027] See also Figure 3 The first turbine 10 is arranged at the front end of the second turbine 15, and the blades inside the first turbine 10 and the second turbine 15 are staggered with each other. The first turbine 10 and the second turbine 15 are both installed inside the housing assembly 1, and the first turbine 10 and the second turbine 15 are staggered with each other, that is, when the oil passes through the first turbine 10 and the second turbine 15 in sequence, there is no interference between them.

[0028] A method for operating a fuel flow sensor, the specific operating steps are as follows: S1: Connect the feed pipe 2 and the discharge pipe 3 to the pipeline, and install a sealing gasket at the connection; After the feed pipe 2 and the discharge pipe 3 are connected to the pipeline, the convenience of the overall installation of the sensor is improved, and a sealing gasket is installed at the connection to improve the sealing of the structure during installation. S2: Power on the phase difference detection circuit 25 and the speed sensor 24 to complete the sensor self-test; by self-testing the speed sensor 24 and the phase difference detection circuit 25, the speed sensor 24 and the phase difference detection circuit 25 themselves are prevented from affecting the detection effect.

[0029] S3: Start the oil pipe valve. After the fuel flows into the interior of the housing assembly 1, observe whether the first turbine 10 and the second turbine 15 rotate smoothly. The calibration procedure corrects the flow rate. By starting the valve and observing the rotation speeds of the first turbine 10 and the second turbine 15 at the same time, the accuracy of the detection is improved through double detection. When the speed difference between the first turbine 10 and the second turbine 15 is too large, that is, there is a problem with the detection result, the existing sensor can be repaired in time.

[0030] S4: The rotational speed of the outer sealing sleeve 9 and the detection plate 17 is detected by the detection probe 23 to ensure that the two groups of detection probes 23 detect the rotational speed of the first turbine 10 and the second turbine 15. The signal detection relationship curve detected by the speed sensor 24 and the phase difference detection circuit 25 can detect the flow rate by observing the rotational speed.

[0031] Working principle: When in use, connect the feed pipe 2 and the discharge pipe 3 to the pipeline, open the valve, control the oil to be transported to the inside of the shell assembly 1 through the feed pipe 2, and at the same time, the oil contacts the first turbine 10 and the second turbine 15. Since the first turbine 10 and the second turbine 15 are driven to rotate, the first turbine 10 drives the outer sealing sleeve 9 to rotate, and the second turbine 15 drives the detection plate 17 to rotate. The two sets of outer sleeves 21 are sequentially sleeved on the outside of the detection plate 17 and the outer sealing sleeve 9. The control detection probe 23 can detect the rotational speed of the detection plate 17 and the outer sealing sleeve 9, and at the same time transmit the rotational speed to the speed sensor 24, and use the phase difference detection circuit 25 to detect the speed difference and the speed. Then, by observing the speed difference, the rotational speed of the first turbine 10 and the second turbine 15 can be accurately detected and processed, and the flow rate of the oil can be accurately detected and processed.

[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A fuel flow sensor, comprising a housing assembly (1), a bracket (4) being mounted in the middle of the housing assembly (1), a first bearing being fixedly connected to the inner side of the bracket (4), a turbine shaft (8) being mounted inside the first bearing, and characterized in that: The rear end thread of the turbine shaft (8) is matched with an outer sealing sleeve (9) for limiting the first bearing, the front end of the turbine shaft (8) is mounted with a first turbine (10) through a nut (11), the middle part of the turbine shaft (8) is sleeved with a second bearing, the outer portion of the second bearing is sleeved with a second turbine (15), the rear end of the second turbine (15) is mounted with a connecting plate (16), the rear end of the second bearing outer ring (14) is fixedly connected with a detection plate (17), the outside of the housing assembly (1) is provided with an opening, the inside of the opening is mounted with a mounting plate (18), the inside of the mounting plate (18) is mounted with a sensor mounting seat (22), the lower end of the sensor mounting seat (22) is fixedly connected with two groups of traction rods (20), the traction rods (20) pass through the inside of the mounting plate (18), and the inside of the sensor mounting seat (22) is mounted with a sensor.

2. A fuel flow sensor according to claim 1, characterized in that: The first bearing comprises a first bearing outer ring (5), a first bearing ball (6) and a first bearing inner ring (7); the first bearing outer ring (5) and the turbine shaft (8) are matched and connected to each other; the bracket (4) is fixed to the outside of the turbine shaft (8); the second bearing comprises a second bearing inner ring (12), a second bearing ball (13) and a second bearing outer ring (14); the second bearing inner ring (12) and the turbine shaft (8) are matched and connected to each other; the second turbine (15) is fixed to the outside of the second bearing outer ring (14).

3. A fuel flow sensor according to claim 2, characterized in that: The connecting plate (16) is installed between the first bearing and the second bearing, and the end of the connecting plate (16) is fixed outside the outer ring (5) of the first bearing.

4. A fuel flow sensor according to claim 1, characterized in that: A feed pipe (2) and a discharge pipe (3) are sequentially mounted on both ends of the housing assembly (1); the feed pipe (2) is connected to the oil feed pipe, and the discharge pipe (3) is connected to the oil outlet pipe; a spiral groove is provided inside the discharge pipe (3).

5. The fuel flow sensor according to claim 1, characterized in that: The lower end of the traction rod (20) is fixedly connected to two sets of outer sleeves (21), and the two sets of outer sleeves (21) are sequentially sleeved on the outside of the detection plate (17) and the outer sealing sleeve (9).

6. A fuel flow sensor according to claim 4, characterized in that: The sensor comprises a rotation speed sensor (24) and a phase difference detection circuit (25), wherein the rotation speed sensor (24) and the phase difference detection circuit (25) are mounted inside the sensor mounting base (22), and a detection probe (23) is fixedly connected to the lower end of the rotation speed sensor (24), and the detection probe (23) is mounted inside the traction rod (20).

7. The fuel flow sensor according to claim 1, characterized in that: A jacket (19) for limiting the position of the mounting plate (18) is installed on the outside of the housing assembly (1), and a sealing gasket is installed at the connection between the mounting plate (18) and the housing assembly (1).

8. The fuel flow sensor according to claim 1, characterized in that: The first turbine (10) is arranged at the front end of the second turbine (15), and the blades inside the first turbine (10) and the second turbine (15) are arranged in a staggered manner.

9. A method for operating a fuel flow sensor, characterized in that: The specific operation steps of using the fuel flow sensor according to claim 6 are as follows: S1: Connect the feed pipe (2) and the discharge pipe (3) to the pipeline, and install a sealing gasket at the connection; S2: Power on the phase difference detection circuit (25) and the speed sensor (24) to complete the sensor self-test; S3: Start the oil pipe valve, and after the fuel flows into the interior of the housing assembly (1), observe whether the first turbine (10) and the second turbine (15) rotate smoothly, and calibrate the flow rate; S4: The rotation speed of the outer sealing sleeve (9) and the detection plate (17) is detected by the detection probe (23) to ensure that the two sets of detection probes (23) detect the rotation speed of the first turbine (10) and the second turbine (15), and the signal detection relationship curve detected by the speed sensor (24) and the phase difference detection circuit (25) is obtained.

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