Flow sensor for locomotive fuel oil monitoring

Abstract

The invention discloses a flow sensor for locomotive fuel oil monitoring, and belongs to the technical field of sensors, the flow sensor comprises a corrosion-resistant shell installed on a locomotive fuel oil system, the lower end of the corrosion-resistant shell is connected with a connecting line, and the left side and the right side of the corrosion-resistant shell are communicated with a liquid inlet pipe and a liquid outlet pipe respectively; a fixing seat is fixedly mounted on the inner side of the end of the liquid inlet pipe in an embedded mode, a filter screen is elastically and slidably connected to the inner side of the liquid inlet pipe, an air storage bag is connected between the fixing seat and the filter screen, meanwhile, a telescopic adjusting assembly is connected between the filter screen and the inner wall of the liquid inlet pipe, and a preset deformation bag is arranged on the inner side of the telescopic adjusting assembly; and a corrosion-resistant elastic membrane is fixedly connected between the filter screen and the liquid inlet pipe. According to the flow sensor for locomotive fuel oil monitoring, self-adaptive adjustment of the flow hole diameter can be achieved according to the consistency of oil liquid, the oil liquid can be automatically filtered and cleaned, and the detection precision is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and specifically to a flow sensor for locomotive fuel monitoring. Background Art

[0002] As a key support for the power output of a locomotive, precise monitoring and effective management of its fuel system are important links to ensure the good operation state of the locomotive. As the core component of locomotive fuel monitoring, the flow sensor plays an irreplaceable role in aspects such as fuel consumption measurement, fuel injection control, and fault diagnosis.

[0003] The prior art (Chinese patent with application number: 202220880817.2, application date: April 15, 2022) discloses a flow sensor for monitoring fuel consumption, including an outlet pipe. One end of the outlet pipe is fixedly connected to a housing. A turbine is installed inside the housing, and a magnetoelectric converter is connected to the outside of the housing. One end of the housing is fixedly connected to a circular pipe. A buffer device is installed inside the circular pipe, and a limiting ring is installed on the inner wall of the circular pipe. One end of the circular pipe is movably connected to a straight pipe. A first buffer chamber is installed at one end of the straight pipe. One side of the first buffer chamber is connected to a transverse pipe. One end of the transverse pipe is fixedly connected to a second buffer chamber. One side of the second buffer chamber is fixedly connected to an inlet pipe. For this flow sensor for monitoring fuel consumption, by installing a buffer device inside the circular pipe, when fuel enters the circular pipe, it impacts the arc-shaped butterfly valves. Under the action of a spring, the two groups of arc-shaped butterfly valves are pushed open, and the fuel then enters the housing. The two groups of arc-shaped butterfly valves further relieve the impact force when the fuel enters, which is beneficial to protecting components such as the turbine from being damaged due to excessive impact force; The prior art (Chinese patent with application number: 202220880817.2, application date: April 15, 2022) discloses a flow sensor for monitoring fuel consumption, including an outlet pipe. One end of the outlet pipe is fixedly connected to a housing. A turbine is installed inside the housing, and a magnetoelectric converter is connected to the outside of the housing. One end of the housing is fixedly connected to a circular pipe. A buffer device is installed inside the circular pipe, and a limiting ring is installed on the inner wall of the circular pipe. One end of the circular pipe is movably connected to a straight pipe. A first buffer chamber is installed at one end of the straight pipe. One side of the first buffer chamber is connected to a transverse pipe. One end of the transverse pipe is fixedly connected to a second buffer chamber. One side of the second buffer chamber is fixedly connected to an inlet pipe. For this flow sensor for monitoring fuel consumption, by installing a buffer device inside the circular pipe, when fuel enters the circular pipe, it impacts the arc-shaped butterfly valves. Under the action of a spring, the two groups of arc-shaped butterfly valves are pushed open, and the fuel then enters the housing. The two groups of arc-shaped butterfly valves further relieve the impact force when the fuel enters, which is beneficial to protecting components such as the turbine from being damaged due to excessive impact force; Although the existing flow sensors for locomotive fuel monitoring can reduce the impact of oil through a buffer structure during use, their flow diameters cannot be adjusted adaptively. When the oil viscosity is too high, the buffer structure will cause blockage inside the device, reducing the detection accuracy of the sensor, and there are certain defects in use. Summary of the Invention

[0004] The object of the present invention is to provide a flow sensor for locomotive fuel monitoring, so as to solve the problem proposed in the above background technology that although the flow sensor for locomotive fuel monitoring on the current market can reduce the impact of oil fluid through a buffer structure during use, its flow diameter cannot be adaptively adjusted. When the oil fluid viscosity is too high, the buffer structure will cause blockage inside the device, reducing the detection accuracy of the sensor.

[0005] To achieve the above object, the present invention provides the following technical solution: A flow sensor for locomotive fuel monitoring includes a corrosion-resistant housing installed on the locomotive fuel system. A connecting wire is connected to the lower end of the corrosion-resistant housing, and a liquid inlet pipe and a liquid outlet pipe are respectively communicated with the left and right sides of the corrosion-resistant housing. Moreover, the liquid inlet pipe, the liquid outlet pipe and the locomotive fuel delivery system pipeline are connected. At the same time, an impeller for measuring flow is rotatably installed in the upper liquid delivery cavity of the corrosion-resistant housing. A fixing seat is fixedly installed by embedding at the inner end of the liquid inlet pipe. A filter screen is elastically slidably connected to the inner side of the liquid inlet pipe. A storage airbag is connected between the fixing seat and the filter screen. At the same time, a telescopic adjustment component is connected between the filter screen and the inner wall of the liquid inlet pipe. Moreover, a preset deformation airbag is arranged inside the telescopic adjustment component. A corrosion-resistant elastic diaphragm is fixedly connected between the filter screen and the liquid inlet pipe. A winding wheel is elastically rotatably connected to the center position of the filter screen, and a clogging cleaning component for cleaning the filtered matter is installed on the shaft portion of the winding wheel.

[0006] Preferably, the cavity in the upper part of the corrosion-resistant housing is communicated with the liquid inlet pipe and the liquid outlet pipe, and the oil fluid entering the liquid inlet pipe impacts the impeller to drive it to rotate.

[0007] Preferably, the outer wall of the filter screen fits against the inner wall of the liquid inlet pipe. A return spring is connected between the filter screen and the inner wall of the liquid inlet pipe. The filter screen elastically slides inside the liquid inlet pipe under the impact of the fuel.

[0008] Preferably, the telescopic adjustment component includes a telescopic piece fixedly installed on the left side of the filter screen and a telescopic seat body fixedly installed on the inner side of the liquid inlet pipe. Both the telescopic piece and the telescopic seat body are arranged in a circular structure, and the telescopic piece and the telescopic seat body are telescopically connected. At the same time, the return spring is located outside the telescopic piece and the telescopic seat body.

[0009] Preferably, the preset deformation airbag is arranged in an annular structure. An air delivery pipeline is fixedly connected between the preset deformation airbag and the storage airbag. When the filter screen moves to the left under the action of the fuel, it will cooperate with the fixing seat to stretch the storage airbag. At the same time, when the storage airbag is stretched, it extracts the gas in the preset deformation airbag through the air delivery pipeline.

[0010] Preferably, the corrosion-resistant elastic diaphragm is arranged in an annular structure, and the corrosion-resistant elastic diaphragm is attached to the inner circumferential wall of the preset deformable bladder. When the preset deformable bladder deforms, it pushes the corrosion-resistant elastic diaphragm to elastically deform to achieve adaptive adjustment of the flow aperture.

[0011] Preferably, the shaft portion of the wire winding wheel penetrates through the central position of the filter screen. A torsion spring is connected between the shaft portion of the wire winding wheel and the filter screen. A traction pull rope is wound and connected to the outside of the wire winding wheel. The right end of the traction pull rope is fixedly connected to the fixed seat. When the filter screen moves under the impact of fuel, the traction pull rope pulls the wire winding wheel to rotate elastically.

[0012] Preferably, the clogging clearing assembly includes scraping blades uniformly and fixedly installed at the right end of the shaft portion of the wire winding wheel. The scraping blades are attached to the right side of the filter screen. When the wire winding wheel drives the scraping blades to rotate, the filter residues outside the filter screen are scraped and cleaned.

[0013] Preferably, the clogging clearing assembly further includes a movable magnetic sheet elastically rotatably installed at the left end of the shaft portion of the wire winding wheel. The scraping blade is made of a magnetic material. The magnetic poles of the opposite surfaces of the scraping blade and the movable magnetic sheet are the same. When the scraping blade rotates and approaches the movable magnetic sheet, the movable magnetic sheet rotates elastically under the action of magnetic force. When the movable magnetic sheet elastically rotates and resets, it knocks on the filter screen.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The flow sensor for locomotive fuel monitoring can achieve adaptive adjustment of the flow aperture according to the consistency of the oil fluid, and can automatically filter and clean the oil fluid to ensure the detection accuracy. The specific content is as follows; 1. A filter screen and a return spring are provided. The filter screen can fully filter impurities in the oil fluid, preventing impurities from entering the inside of the sensor and affecting the subsequent detection accuracy. At the same time, after being impacted by the oil fluid, the filter screen undergoes elastic displacement under the elastic force of the return spring, thereby achieving buffering of the oil fluid impact.

[0015] 2. An air storage bladder, a preset deformable bladder, and a corrosion-resistant elastic diaphragm are provided. When the consistency of the oil fluid is relatively high, the filter screen will move elastically under the action of resistance. At this time, the filter screen will cooperate with the fixed seat to stretch the air storage bladder, causing the air storage bladder to automatically extract the air in the preset deformable bladder through a pipeline, reducing the air pressure inside the preset deformable bladder. At this time, the corrosion-resistant elastic diaphragm will elastically deform, thereby expanding the flow aperture formed by the corrosion-resistant elastic diaphragm, preventing the pressure inside the corrosion-resistant housing from being too high and affecting the detection accuracy.

[0016] 3. A wire winding wheel, a traction pull rope and a scraping blade are provided. When the filter screen moves under the impact of the oil fluid, the traction pull rope connected to the fixed seat will drive the wire winding wheel to rotate synchronously. After the fuel delivery ends, the filter screen will slide back under the elastic force of the return spring, so that the filter screen can shake off the impurities attached to its outer side. At the same time, the wire winding wheel will rotate elastically back, and then drive the scraping blade through the shaft part to scrape off the impurities on the surface of the filter screen.

[0017] Furthermore, a movable magnetic sheet is also provided. As the wire winding wheel drives the scraping blade to rotate, the scraping blade can intermittently approach the movable magnetic sheet, causing the movable magnetic sheet to rotate elastically under the action of magnetic force. When the scraping blade moves away from the movable magnetic sheet, the movable magnetic sheet elastically resets, and then knocks against the outer side of the filter screen again, thereby shaking out the impurities stuck in the filter holes of the filter screen, further improving the cleaning and anti-blocking effect of the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic three-dimensional structure diagram of the present invention; Figure 2 is a schematic installation structure diagram of the impeller of the present invention; Figure 3 is a schematic cross-sectional structure diagram of the present invention; Figure 4 is a schematic cross-sectional structure diagram of the liquid inlet pipe of the present invention; Figure 5 For the present invention Figure 4 is a schematic enlarged structure diagram at A in; Figure 6 is a schematic connection structure diagram of the air storage bag body and the preset deformation bag body of the present invention; Figure 7 is a schematic installation structure diagram of the scraping blade of the present invention; Figure 8 is a schematic disassembled structure diagram of the preset deformation bag body and the corrosion-resistant elastic membrane of the present invention.

[0019] In the figure: 1. Corrosion-resistant housing; 2. Connecting wire; 3. Liquid inlet pipe; 4. Liquid outlet pipe; 5. Impeller; 6. Fixed seat; 7. Filter screen; 8. Air storage bag body; 9. Return spring; 10. Telescopic piece; 11. Telescopic seat body; 12. Preset deformation bag body; 13. Corrosion-resistant elastic membrane; 14. Wire winding wheel; 15. Traction pull rope; 16. Scraping blade; 17. Movable magnetic sheet. DETAILED DESCRIPTION OF THE INVENTION

[0020] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1: The pipeline structure of the existing flow sensor is fixed, and the liquid flow aperture cannot be adjusted, which easily affects the flow detection accuracy when the oil consistency changes. To solve this technical problem, the following technical content is disclosed in this embodiment. Please refer to Figures 1-6 and Figure 8 as shown; A flow sensor for locomotive fuel monitoring includes a corrosion-resistant housing 1 installed on the locomotive fuel system. A connecting wire 2 is connected to the lower end of the corrosion-resistant housing 1. The left and right sides of the corrosion-resistant housing 1 are respectively communicated with a liquid inlet pipe 3 and a liquid outlet pipe 4, and the liquid inlet pipe 3, the liquid outlet pipe 4 are connected to the locomotive fuel delivery system pipeline. At the same time, an impeller 5 for measuring flow is rotatably installed in the upper liquid delivery cavity of the corrosion-resistant housing 1; A fixed seat 6 is fixedly installed by embedding at the inner end of the liquid inlet pipe 3. A filter screen 7 is elastically slidably connected to the inner side of the liquid inlet pipe 3. An air storage bladder 8 is connected between the fixed seat 6 and the filter screen 7. At the same time, a telescopic adjustment assembly is connected between the filter screen 7 and the inner wall of the liquid inlet pipe 3. A preset deformation bladder 12 is arranged inside the telescopic adjustment assembly. A corrosion-resistant elastic diaphragm 13 is fixedly connected between the filter screen 7 and the liquid inlet pipe 3; The cavity in the upper part of the corrosion-resistant housing 1 is communicated with the liquid inlet pipe 3 and the liquid outlet pipe 4, and the oil entering the liquid inlet pipe 3 impacts the impeller 5 to drive it to rotate.

[0022] The outer wall of the filter screen 7 fits against the inner wall of the liquid inlet pipe 3. A return spring 9 is connected between the filter screen 7 and the inner wall of the liquid inlet pipe 3. The filter screen 7 elastically slides inside the liquid inlet pipe 3 under the impact of the fuel.

[0023] The telescopic adjustment assembly includes a telescopic piece 10 fixedly installed on the left side of the filter screen 7 and a telescopic seat body 11 fixedly installed on the inner side of the liquid inlet pipe 3. Both the telescopic piece 10 and the telescopic seat body 11 are circularly structured, and the telescopic piece 10 and the telescopic seat body 11 are telescopically connected. At the same time, the return spring 9 is located outside the telescopic piece 10 and the telescopic seat body 11.

[0024] The preset deformation bladder 12 is annularly structured. An air delivery pipeline is fixedly connected between the preset deformation bladder 12 and the air storage bladder 8. When the filter screen 7 moves to the left under the action of the fuel, it cooperates with the fixed seat 6 to stretch the air storage bladder 8. At the same time, when the air storage bladder 8 is stretched, it extracts the gas in the preset deformation bladder 12 through the air delivery pipeline.

[0025] The corrosion-resistant elastic diaphragm 13 is arranged in an annular structure, and the corrosion-resistant elastic diaphragm 13 is attached to the inner circumferential wall of the preset deformable bladder 12. When the preset deformable bladder 12 deforms, it pushes the corrosion-resistant elastic diaphragm 13 to elastically deform to achieve adaptive adjustment of the flow aperture.

[0026] By adopting the above technical solution, the liquid inlet pipe 3, the liquid outlet pipe 4 of the flow sensor and the locomotive fuel delivery system are connected, so that the oil liquid enters the corrosion-resistant housing 1 through the liquid inlet pipe 3 and impacts the impeller 5 to drive the impeller 5 to rotate, thereby realizing flow detection. When the fuel consistency is relatively high, the filter screen 7 will elastically slide along the inner wall of the liquid inlet pipe 3 under the impact of the oil liquid, thereby compressing the return spring 9. At the same time, the filter screen 7 will cooperate with the fixed seat 6 to stretch the air storage bladder 8, so that the air storage bladder 8 automatically extracts the gas in the preset deformable bladder 12 through the pipeline. At this time, the air pressure inside the preset deformable bladder 12 will gradually decrease. During the process of the volume of the preset deformable bladder 12 becoming smaller, the corrosion-resistant elastic diaphragm 13 will synchronously elastically contract, so that the corrosion-resistant elastic diaphragm 13 forms a larger fuel flow aperture, thereby reducing the resistance of fuel flow to improve the detection accuracy of the flow sensor. When the fuel consistency is relatively low, the resistance received by the filter screen 7 decreases, and its movement distance shortens, so that the air pressure in the preset deformable bladder 12 is relatively high, and then it can push the corrosion-resistant elastic diaphragm 13 to deform and stretch, so that the fuel flow aperture shrinks.

[0027] Embodiment 2: The technical content disclosed in this embodiment is a further improvement based on the above Embodiment 1. Although the existing flow sensor has a certain filtering function during use, most of them lack a clogging cleaning mechanism, so that the filtering mechanism is prone to clogging after long-term use, thereby affecting the flow detection accuracy. To further solve this technical problem, the following technical content is disclosed in this embodiment, as Figures 4-7 shown; a winding wheel 14 is elastically rotatably connected to the central position of the filter screen 7, and a clogging cleaning component for cleaning the filtered matter is installed on the shaft portion of the winding wheel 14. The shaft portion of the winding wheel 14 penetrates through the central position of the filter screen 7, and a torsion spring is connected between the shaft portion of the winding wheel 14 and the filter screen 7. A traction pull rope 15 is wound and connected to the outside of the winding wheel 14. At the same time, the right end of the traction pull rope 15 is fixedly connected to the fixed seat 6, and when the filter screen 7 moves under the impact of fuel, the traction pull rope 15 pulls the winding wheel 14 to elastically rotate.

[0028] The clogging cleaning component includes scraping blades 16 uniformly and fixedly installed on the right end of the shaft portion of the winding wheel 14, and the scraping blades 16 are attached to the right side of the filter screen 7. When the winding wheel 14 drives the scraping blades 16 to rotate, the filtered matter on the outside of the filter screen 7 is scraped and cleaned.

[0029] The clog-removing assembly further includes a movable magnetic sheet 17 elastically and rotatably mounted on the left end of the shaft portion of the wire winding wheel 14. The scraping blade 16 is made of a magnetic material, and the magnetic poles of the opposite surfaces of the scraping blade 16 and the movable magnetic sheet 17 are the same. When the scraping blade 16 rotates and approaches the movable magnetic sheet 17, the movable magnetic sheet 17 elastically rotates under the action of magnetic force. At the same time, when the movable magnetic sheet 17 elastically rotates and resets, it knocks on the filter screen 7.

[0030] Through the above technical solution, when the oil fluid flows into the liquid inlet pipe 3, the filter screen 7 can filter the oil fluid. At the same time, the filter screen 7 will elastically move under the impact of the oil fluid. At this time, the traction rope 15 fixedly connected to the fixed seat 6 can pull the wire winding wheel 14 to elastically rotate. At this time, the wire winding wheel 14 can drive a plurality of scraping blades 16 to rotate through the shaft portion, so that the scraping blades 16 can scrape off the impurities attached to the outside of the filter screen 7. When the scraping blade 16 rotates, it will intermittently pass by the outside of the movable magnetic sheet 17 at different positions, so that the movable magnetic sheet 17 elastically rotates under the action of magnetic force. When the scraping blade 16 moves away from the movable magnetic sheet 17, the movable magnetic sheet 17 will elastically rotate and reset. At this time, the movable magnetic sheet 17 can knock on the filter screen 7, so that the impurities stuck in the filter holes fall off, further improving the automatic cleaning effect of the filter screen 7.

[0031] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A flow sensor for locomotive fuel monitoring, comprising a corrosion-resistant housing (1) installed on the locomotive fuel system. A connecting wire (2) is connected to the lower end of the corrosion-resistant housing (1). The left and right sides of the corrosion-resistant housing (1) are respectively communicated with a liquid inlet pipe (3) and a liquid outlet pipe (4), and the liquid inlet pipe (3), the liquid outlet pipe (4) are connected to the locomotive fuel delivery system pipeline. At the same time, an impeller (5) for measuring flow is rotatably installed in the upper liquid delivery cavity of the corrosion-resistant housing (1). It is characterized in that A fixing seat (6) is fixedly installed by embedding at the inner end of the liquid inlet pipe (3). A filter screen (7) is elastically slidably connected to the inner side of the liquid inlet pipe (3). A gas storage bladder (8) is connected between the fixing seat (6) and the filter screen (7). At the same time, a telescopic adjustment assembly is connected between the filter screen (7) and the inner wall of the liquid inlet pipe (3). A preset deformation bladder (12) is arranged inside the telescopic adjustment assembly. A corrosion-resistant elastic diaphragm (13) is fixedly connected between the filter screen (7) and the liquid inlet pipe (3). A winding wheel (14) is elastically rotatably connected to the central position of the filter screen (7), and a clogging cleaning assembly for cleaning the filtered matter is installed on the shaft of the winding wheel (14).

2. The flow sensor for locomotive fuel monitoring according to claim 1, characterized in that: The cavity in the upper part of the corrosion-resistant housing (1) is communicated with the liquid inlet pipe (3) and the liquid outlet pipe (4). The oil liquid entering the liquid inlet pipe (3) impacts the impeller (5) to drive it to rotate.

3. The flow sensor for locomotive fuel monitoring according to claim 1, characterized in that: The outer wall of the filter screen (7) fits against the inner wall of the liquid inlet pipe (3). A return spring (9) is connected between the filter screen (7) and the inner wall of the liquid inlet pipe (3). The filter screen (7) elastically slides inside the liquid inlet pipe (3) under the impact of fuel.

4. The flow sensor for locomotive fuel monitoring according to claim 1, characterized in that: The telescopic adjustment assembly includes a telescopic piece (10) fixedly installed on the left side of the filter screen (7) and a telescopic seat body (11) fixedly installed on the inner side of the liquid inlet pipe (3). Both the telescopic piece (10) and the telescopic seat body (11) are circular in structure. The telescopic piece (10) and the telescopic seat body (11) are telescopically connected. At the same time, the return spring (9) is located outside the telescopic piece (10) and the telescopic seat body (11).

5. The flow sensor for locomotive fuel monitoring according to claim 1, wherein: The preset deformation bladder (12) is annular in structure. An air delivery pipe is fixedly connected between the preset deformation bladder (12) and the gas storage bladder (8). When the filter screen (7) moves to the left under the action of fuel, it will cooperate with the fixing seat (6) to stretch the gas storage bladder (8). At the same time, when the gas storage bladder (8) is stretched, it extracts the gas in the preset deformation bladder (12) through the air delivery pipe.

6. The flow sensor for locomotive fuel monitoring according to claim 1, characterized in that: The corrosion-resistant elastic diaphragm (13) is annular in structure. The corrosion-resistant elastic diaphragm (13) fits against the inner circumferential wall of the preset deformation bladder (12). When the preset deformation bladder (12) deforms, it pushes the corrosion-resistant elastic diaphragm (13) to elastically deform to realize the adaptive adjustment of the flow aperture.

7. The flow sensor for locomotive fuel monitoring according to claim 1, wherein: The shaft portion of the winding wheel (14) penetrates through the central position of the filter screen (7), and a torsion spring is connected between the shaft portion of the winding wheel (14) and the filter screen (7). A traction pull rope (15) is wound and connected to the outside of the winding wheel (14). At the same time, the right end of the traction pull rope (15) is fixedly connected to the fixed seat (6). Moreover, when the filter screen (7) moves under the impact of fuel, the traction pull rope (15) pulls the winding wheel (14) to rotate elastically.

8. The flow sensor for locomotive fuel monitoring according to claim 7, characterized in that: The blockage clearing assembly includes scraping blades (16) uniformly and fixedly installed at the right end of the shaft portion of the winding wheel (14). The scraping blades (16) are attached to the right side of the filter screen (7). When the winding wheel (14) drives the scraping blades (16) to rotate, the filter residues outside the filter screen (7) are scraped and cleaned.

9. The flow sensor for locomotive fuel monitoring according to claim 8, characterized in that: The blockage clearing assembly further includes a movable magnetic sheet (17) elastically rotatably installed at the left end of the shaft portion of the winding wheel (14). The scraping blade (16) is made of a magnetic material, and the magnetic poles of the opposite surfaces of the scraping blade (16) and the movable magnetic sheet (17) are the same. When the scraping blade (16) rotates and approaches the movable magnetic sheet (17), the movable magnetic sheet (17) rotates elastically under the action of magnetic force. At the same time, when the movable magnetic sheet (17) rotates elastically and resets, it knocks on the filter screen (7).

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