Fuel flow sensor

Abstract

The fuel oil flow sensor comprises a mechanical unit and an electrical unit, the mechanical unit comprises a driving assembly, a rectifying assembly and a rotating assembly which are sequentially arranged on a central shaft, the rotating assembly comprises an impeller, a volute spiral spring and a drum wheel which are sequentially arranged on the central shaft, and the impeller is connected with the drum wheel through the volute spiral spring. The impeller is connected with the central shaft through a bearing, magnets are respectively mounted on the impeller and the drum wheel, the electrical unit comprises an impeller sensing assembly and a drum wheel sensing assembly which respectively correspond to the magnets on the impeller and the magnets on the drum wheel, and an auxiliary turbine is arranged on one side, close to the medium outlet, of the drum wheel on the central shaft. The auxiliary turbine is arranged on one side, close to the medium outlet, of the drum wheel on the central shaft, and the rotating speed of the sensor is adjusted by controlling the rotating resistance of the auxiliary turbine in the medium, so that the rotating speed of the sensor is controlled within a certain range; the problem that the output signal stability, the measurement accuracy of the sensor and the service life of the bearing are affected by too fast rotating speed of the sensor is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel flow measurement, and particularly relates to a fuel flow sensor. Background Art

[0002] For vehicles powered by fuel, such as aircraft, automobiles, etc., a fuel flow sensor is usually connected in series on the pipeline where fuel enters the engine combustion chamber to measure the instantaneous fuel consumption. With the development of science and technology, the reliability requirements of the engine for the fuel flow sensor are getting higher and higher.

[0003] Modern vehicles usually use direct mass flow type or indirect volume type fuel flow sensors to measure the instantaneous fuel consumption. Their working principles essentially convert the flow velocity into the rotational speed of a rotating component in the inner cavity of the sensor, and then through the magnetoelectric induction effect of the rotating component and the induction coil, an induction signal proportional to the rotational speed and flow rate of the rotating component is generated in the induction coil through the change of magnetic flux.

[0004] Due to reasons such as the machining and assembly of the driving component and the material consistency of this kind of fuel flow sensor, the rotational speed of each sensor is often different. The output signals generated by rotating too fast or too slow are not conducive to being collected and processed by the subsequent signal, and rotating too fast easily accelerates the wear of the bearing and affects the service life. In order to meet the performance requirements of the sensor, the rotational speed of the rotating component in the mechanical chamber of the fuel flow sensor needs to be controlled within a certain range. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a fuel flow sensor to solve the problems that the too fast rotational speed of the sensor affects the stability of the output signal, the measurement accuracy of the sensor and the service life of the bearing.

[0006] The utility model is realized through the following technical solutions:

[0007] A fuel flow sensor includes a mechanical unit and an electrical unit. The mechanical unit includes a driving component, a rectifying component and a rotating component sequentially arranged on a central axis. The rotating component includes an impeller, a volute spring and a drum sequentially arranged on the central axis. The impeller is connected to the drum through the volute spring. The impeller is connected to the central axis through a bearing. Magnets are respectively installed on the impeller and the drum. The electrical unit includes an impeller induction component and a drum induction component respectively corresponding to the magnets on the impeller and the drum. An auxiliary turbine is arranged on the central axis on the side of the drum close to the medium outlet. The auxiliary turbine adjusts the rotational speed of the rotating component through the rotational resistance generated by it in the medium.

[0008] In some embodiments, the auxiliary turbine includes a turbine body and blades. The turbine body is a spherical surface protruding towards the medium outlet direction. A plurality of blades are evenly distributed along the circumferential direction on one side of the turbine body towards the medium outlet direction, and the blades are arranged perpendicular to the surface of the turbine body.

[0009] In some embodiments, one end of the blade extends out of the outer edge contour of the turbine body.

[0010] In some embodiments, the end of the blade that extends out of the outer edge contour of the turbine body is set such that the width of the blade gradually decreases in the direction away from the outer edge contour.

[0011] In some embodiments, the connection between the blade and the turbine body is detachable.

[0012] In some embodiments, a plurality of grooves are evenly distributed along the circumferential direction on the edge of the turbine body. A central hole is formed in the middle of the turbine body, and a plurality of evenly distributed flow holes are formed around the central hole on the turbine body.

[0013] In some embodiments, a balance piece is arranged in the inner cavity of the impeller, and the balance piece is used to adjust the balance of the rotating assembly at various positions in the circumferential direction.

[0014] In some embodiments, the balance piece includes a ring body and a plurality of brackets. The plurality of brackets are installed on the outer edge of the ring body along the circumferential direction of the ring body, and each bracket on the balance piece has a different weight.

[0015] In some embodiments, the impeller induction assembly and the drum induction assembly include two groups of induction coils.

[0016] In some embodiments, the impeller induction assembly and the drum induction assembly are formed by double-wire winding.

[0017] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0018] 1. An auxiliary turbine is arranged on the central shaft on the side of the drum close to the medium outlet. By controlling the rotation resistance of the auxiliary turbine in the medium, the rotation speed of the sensor is adjusted, the rotation speed of the sensor is controlled within a certain range, the stability of the output signal is improved, the measurement accuracy of the sensor is improved, and the wear of the bearing is reduced and the service life of the bearing is extended.

[0019] 2. A plurality of blades are evenly distributed along the circumferential direction on one side of the turbine body towards the medium outlet direction, and the connection between the blade and the turbine body is detachable. By changing the number of blades, the rotation resistance of the blades in the medium is adjusted to regulate the rotation speed of the rotating assembly, and the rotation speed of the sensor is controlled within a certain range.

[0020] 3. One end of the blade extending beyond the outer edge contour of the turbine body is configured such that the width of the blade gradually decreases in the direction away from the outer side of the edge contour, thereby reducing the area of the blade. Further, the rotational resistance of the blade in the medium is adjusted to finely tune the rotational speed of the rotating assembly, so that the rotational speed of the sensor is controlled within a certain range, further improving the stability of the output signal and the measurement accuracy of the sensor.

[0021] 4. A balance plate is provided in the inner cavity of the impeller. A plurality of brackets are circumferentially mounted on the outer edge of the ring body. Each bracket on the balance plate has a different weight. The balance of the rotating assembly at various positions in the circumferential direction is adjusted by the balance plate, improving the stability of the output signal and the measurement accuracy of the sensor, reducing the wear of the bearing, and extending the service life of the bearing.

[0022] 5. The impeller induction assembly and the drum induction assembly are two sets of induction coils wound in a double-wire manner with the same number of turns and the same impedance, reducing the failure rate of the sensor and saving the maintenance time and maintenance cost of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the fuel flow sensor in the embodiment of the present invention.

[0025] Figure 2 It is a schematic structural diagram of the auxiliary turbine in the embodiment of the present invention.

[0026] Figure 3 It is a schematic structural diagram of the balance plate in the embodiment of the present invention.

[0027] Wherein: 1 - electrical unit, 11 - first impeller induction coil, 12 - first drum induction coil, 13 - second impeller induction coil, 14 - second drum induction coil, 2 - mechanical unit, 21 - drive assembly, 22 - rectifying assembly, 23 - central shaft, 24 - impeller, 25 - scroll spring, 26 - drum, 27 - magnet, 3 - auxiliary turbine, 31 - turbine body, 32 - blade, 33 - groove, 34 - central hole, 35 - flow hole, 4 - balance plate, 41 - ring body, 42 - bracket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments.

[0029] Embodiment 1

[0030] Referring to Figure 1 , a fuel flow sensor includes a mechanical unit 2 and an electrical unit 1. The mechanical unit 2 includes a driving assembly 21, a rectifying assembly 22, and a rotating assembly sequentially arranged on a central shaft 23. The rotating assembly includes an impeller 24, a scroll spring 25, and a drum 26 sequentially arranged on the central shaft 23. The impeller 24 is connected to the drum 26 through the scroll spring 25. The impeller 24 is connected to the central shaft 23 through a bearing. Magnets 27 are respectively installed on the impeller 24 and the drum 26. The electrical unit 1 includes an impeller induction assembly and a drum induction assembly respectively corresponding to the magnet 27 on the impeller 24 and the magnet 27 on the drum 26. An auxiliary turbine 3 is arranged on the central shaft 23 on the side of the drum 26 close to the medium outlet.

[0031] By arranging the auxiliary turbine 3 on the central shaft 23 on the side of the drum 26 close to the medium outlet, the rotation speed of the sensor is adjusted by controlling the rotation resistance of the auxiliary turbine 3 in the medium, the rotation speed of the sensor is controlled within a certain range, the stability of the output signal is improved, the measurement accuracy of the sensor is improved, and the wear of the bearing is reduced and the service life of the bearing is prolonged.

[0032] Referring to Figure 2 , the auxiliary turbine 3 includes a turbine body 31 and blades 32. The turbine body 31 is a spherical surface protruding towards the medium outlet direction. A plurality of blades 32 are evenly arranged along the circumferential direction on the side of the turbine body 31 towards the medium outlet direction. The blades 32 are perpendicularly arranged to the surface of the turbine body 31. The blades 32 are detachably connected to the turbine body 31. By changing the number of the blades 32, the rotation resistance of the blades 32 in the medium is adjusted to regulate the rotation speed of the rotating assembly, and the rotation speed of the sensor is controlled within a certain range.

[0033] One end of the blade 32 extends out of the outer edge contour of the turbine body 31. The end of the blade 32 extending out of the outer edge contour of the turbine body 31 is set such that the width of the blade 32 gradually decreases in the direction away from the outer edge contour, so as to reduce the area of the blade 32, further adjust the rotation resistance of the blade 32 in the medium to finely adjust the rotation speed of the rotating assembly, so that the rotation speed of the sensor is controlled within a certain range, and further improve the stability of the output signal and the measurement accuracy of the sensor.

[0034] A plurality of grooves 33 are circumferentially and evenly arranged on the edge of the turbine body 31. A central hole 34 is formed in the middle of the turbine body 31, and a plurality of evenly distributed flow holes 35 are formed around the central hole 34 on the turbine body 31.

[0035] Refer to Figure 3 , a balance piece 4 is arranged in the inner cavity of the impeller 24. The balance piece 4 includes a circular ring body 41 and a plurality of brackets 42. The plurality of brackets 42 are installed on the outer edge of the circular ring body 41 along the circumferential direction of the circular ring body 41. Each bracket 42 on the balance piece 4 has a different weight. By adjusting the balance of the rotating assembly at each position in the circumferential direction through the balance piece 4, the stability of the output signal, the measurement accuracy of the sensor are improved, the wear of the bearing is reduced, and the service life of the bearing is prolonged.

[0036] Refer to Figure 1 , in the electrical unit 1, the impeller induction assembly and the drum induction assembly are wound simultaneously with two wires on the same coil bobbin, and two independent induction coils with the same number of turns and the same impedance on the same coil bobbin are obtained, namely the impeller first induction coil 11, the impeller second induction coil 13, the drum first induction coil 12 and the drum second induction coil 14; the impeller first induction coil 11 and the drum first induction coil 12 are used in combination, the impeller second induction coil 13 and the drum second induction coil 14 are used in combination, or the impeller first induction coil 11 and the drum second induction coil 14 are used in combination, and the impeller second induction coil 13 and the drum first induction coil 12 are used in combination to realize the double margin design of the induction coil.

[0037] The working process of the above fuel sensor:

[0038] When fuel flows into the mechanical unit 2 of the sensor, it generates a driving force as it passes through the driving component 21 and is rectified by the rectifying component 22. Then, it successively passes through the impeller 24, the scroll spring 25, the drum 26, and the auxiliary turbine 3. By controlling the rotational resistance of the auxiliary turbine 3 in the medium, the rotational speed of the sensor is adjusted, and the rotational speed of the sensor is controlled within a certain range. The rotation of the sensor causes a change in magnetic flux, enabling the impeller first induction coil 11 and the drum first induction coil 12 in the electrical unit 1 to generate and output two pulse signals respectively. There is a time difference Ⅰ between the two pulse signals, and this time difference value is directly proportional to the angular offset between the magnet 27 on the drum 26 and the magnet 27 on the impeller 24, as well as the fuel flow rate. At the same time, the impeller second induction coil 13 and the drum second induction coil 14 generate and output two pulse signals respectively, and there is a time difference Ⅱ between the two pulse signals; or the impeller first induction coil 11 and the drum second induction coil 14 generate and output two pulse signals respectively, and there is a time difference Ⅲ between the two pulse signals. At the same time, the impeller second induction coil 13 and the drum first induction coil 12 generate and output two pulse signals respectively, and there is a time difference Ⅳ between the two pulse signals; the time differences Ⅰ, Ⅱ, Ⅲ, and Ⅳ are all the same. When any induction coil has problems such as breakage, short circuit, open circuit, or solder joint detachment, the combination of induction coils can be switched to enable the sensor to continue to operate normally, avoiding the sensor from malfunctioning and stopping working due to a failure in any one induction coil, thereby reducing the failure rate of the sensor and saving the maintenance time and cost of the sensor.

[0039] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Any simple modification or equivalent change made to the above embodiments based on the technical essence of the present invention falls within the protection scope of the present invention.

Claims

1. A fuel flow sensor, comprising a mechanical unit and an electrical unit. The mechanical unit includes a drive assembly, a rectifying assembly, and a rotating assembly sequentially arranged on a central axis. The rotating assembly includes an impeller, a scroll spring, and a drum sequentially arranged on the central axis. The impeller is connected to the drum by the scroll spring. The impeller is connected to the central axis through a bearing. Magnets are respectively installed on the impeller and the drum. The electrical unit includes an impeller induction assembly and a drum induction assembly respectively corresponding to the magnet on the impeller and the magnet on the drum, and is characterized in that: An auxiliary turbine is provided on the central axis on the side of the drum wheel close to the medium outlet, and the auxiliary turbine adjusts the rotation speed of the rotating assembly through the rotational resistance generated by it in the medium.

2. The fuel flow sensor according to claim 1, wherein: The auxiliary turbine includes a turbine body and blades. The turbine body is a spherical surface protruding towards the medium outlet direction. A plurality of blades are evenly arranged along the circumferential direction on the side of the turbine body towards the medium outlet direction, and the blades are arranged perpendicular to the surface of the turbine body.

3. The fuel flow sensor according to claim 2, characterized in that: One end of the blade extends out of the outer edge contour of the turbine body.

4. The fuel flow sensor according to claim 3, wherein: The end of the blade extending out of the outer edge contour of the turbine body is set such that the width of the blade gradually decreases in the direction away from the outer edge contour.

5. A fuel flow sensor according to claim 2, characterized in that: The connection between the blade and the turbine body is detachable.

6. A fuel flow sensor according to claim 2, characterized in that: A plurality of grooves are evenly arranged along the circumferential direction on the edge of the turbine body. A central hole is provided in the middle of the turbine body, and a plurality of evenly distributed flow holes are provided around the central hole on the turbine body.

7. The fuel flow sensor according to claim 1, characterized in that: A balance piece is arranged in the inner cavity of the impeller, and the balance piece is used to adjust the balance of each position of the rotating assembly in the circumferential direction.

8. The fuel flow sensor according to claim 7, characterized in that: The balance piece includes a ring body and a plurality of brackets. The plurality of brackets are installed on the outer edge of the ring body along the circumferential direction of the ring body, and each bracket on the balance piece has a different weight.

9. The fuel flow sensor according to claim 1, characterized in that: The impeller induction component and the drum wheel induction component include two groups of induction coils.

10. The fuel flow sensor according to claim 9, wherein: The impeller induction component and the drum wheel induction component are formed by double-wire winding.

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