Fuel filter pressure difference annunciator

Abstract

The utility model provides a fuel filter pressure difference annunciator which is used for solving the problems that in the prior art, monitoring results are prone to errors, and safety is low. The annunciator comprises a shell, a plunger is arranged in the shell in a sliding mode, the shell at the upper end of the plunger is a high-pressure bin, the high-pressure bin is connected with a high-pressure pipe, the shell at the lower end of the plunger is a low-pressure bin, the low-pressure bin is connected with a low-pressure pipe, the top face of the plunger is connected with the shell through a tension spring, a movable magnet is arranged on the bottom face of the plunger, the bottom face of the shell is connected with a warning bin, and a limiting ring is arranged in the warning bin. A guide rod slides in the limiting ring, a ferromagnetic plate is arranged at the top end of the guide rod, a baffle is arranged at the bottom end of the guide rod, conducting rings are arranged on the faces, close to each other, of the baffle and the limiting ring, and the conducting rings are electrically connected with a warning device. According to the utility model, the conductive ring can be quickly closed by using the acting force between the moving magnet and the ferromagnetic plate, so that the warning device is triggered, and the device has the advantages of high response speed and high detection precision.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a fuel filter pressure difference signal device. Background Art

[0002] In the fuel system, the fuel needs to be filtered. In order to ensure that the filter can work continuously and effectively and prevent insufficient fuel supply or abnormal pressure due to blockage, a differential pressure signal is usually installed on the filter to monitor the pressure difference between the high-pressure chamber and the low-pressure chamber. Traditional differential pressure signalers usually use micro switches as the threshold of the differential pressure to determine whether the differential pressure is too large. After long-term operation, drift or error accumulation is prone to occur, affecting the accuracy of the monitoring results. Factors such as impurities and temperature in the oil will also reduce the monitoring accuracy of the sensor. In addition, the electrical part in the prior art needs to be closely connected to the oil part, which increases the risk of arc ignition and oil leakage, and is prone to environmental pollution caused by oil leakage during the maintenance of the electrical part. Utility Model Content

[0003] The utility model provides a fuel filter pressure difference signal device, which solves the problems of easy error in monitoring results and low safety in the prior art.

[0004] The technical solution of the utility model is achieved in this way:

[0005] A fuel filter pressure difference signal device comprises a shell, a plunger slides in the shell, the shell at the upper end of the plunger is a high-pressure chamber, the high-pressure chamber is connected to a high-pressure pipe, the shell at the lower end is a low-pressure chamber, the low-pressure chamber is connected to a low-pressure pipe, the top surface of the plunger is connected to the shell through a tension spring, the bottom surface of the plunger is provided with a moving magnet, the bottom surface of the shell is connected to a warning chamber, a limit ring is provided in the warning chamber, a guide rod slides in the limit ring, a ferromagnetic plate is provided at the top end of the guide rod, a baffle is provided at the bottom end of the guide rod, a conductive ring is provided on the side of the baffle and the limit ring close to each other, and the conductive ring is electrically connected to a warning device.

[0006] Furthermore, the side wall of the plunger is provided with an oil drain groove, which is connected to the high-pressure chamber through a connecting hole in the plunger, and the side wall of the low-pressure chamber is provided with a pressure discharge hole, which is connected to the low-pressure pipe through a pressure discharge pipe. When the plunger moves to the bottom end of the shell, the oil drain groove is connected to the pressure discharge hole, and the plunger closes the low-pressure pipe. The connection between the oil drain groove and the pressure discharge hole is achieved by the movement of the plunger, and part of the oil can be automatically released to the low-pressure pipe when the pressure in the high-pressure chamber is too high, which plays a role in pressure regulation and avoids excessive pressure from damaging the equipment.

[0007] Furthermore, the outer wall of the housing is provided with a sleeve corresponding to the pressure discharge hole, a hollow bolt is sealed and screwed in the sleeve, and a sealing plate is connected to one end of the hollow bolt near the pressure discharge hole through a pressure regulating spring, the sealing plate can close the pressure discharge hole, and a gap is provided between the sealing plate and the inner wall of the sleeve, and the pressure discharge pipe is connected to the hollow bolt in a rotatable seal. When the oil pressure reaches a preset threshold, the sealing plate can be quickly pushed open, and the oil is quickly discharged through the gap, avoiding system delays or instability caused by pressure accumulation.

[0008] Furthermore, the high-pressure pipe and the low-pressure pipe are connected by a contraction pipe, a filter plate is built into the contraction pipe between the high-pressure pipe and the low-pressure pipe, both ends of the contraction pipe are connected to a tapered pipe, and the large end of the tapered pipe is connected to the oil pipe. The tapered pipe helps to reduce the turbulence and resistance of the fluid in the oil pipe, thereby reducing energy loss.

[0009] Furthermore, the high-pressure pipe and the low-pressure pipe are both connected to the side wall of the tapered pipe, the tapered pipe and the high-pressure pipe and the low-pressure pipe are connected at the points where the tapered pipe is connected through a rounded transition, the axis of the high-pressure pipe is parallel to the axis of the contraction pipe, the low-pressure pipe is L-shaped, one end of the low-pressure pipe connected to the tapered pipe is a vertical end, and the other end is a horizontal end. The design of the high-pressure pipe being parallel to the axis of the oil pipe helps to reduce turbulence and resistance when the fluid enters, and the L-shaped low-pressure pipe can effectively guide the flow of oil and reduce energy loss during the flow process.

[0010] The beneficial effects that this technical solution can produce.

[0011] The utility model can detect the pressure difference change between the high-pressure chamber and the low-pressure chamber by the plunger in the housing in conjunction with the high-pressure pipe and the low-pressure pipe, and then use the force between the moving magnet and the ferromagnetic plate to quickly close the conductive ring, thereby triggering the warning device, which has the advantages of fast response speed and high detection accuracy. The electrical part is completely isolated from the oil part by the warning chamber, and when the warning device needs to be maintained or replaced, it can be operated more conveniently, and there is no need to worry about safety accidents caused by oil leakage and arc fire during practical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0014] Figure 2 It is a cross-sectional view of the utility model;

[0015] Figure 3 It is a partial cross-sectional view of the housing and the warning compartment of the utility model;

[0016] Figure 4 for Figure 3 A local enlarged schematic diagram of the middle A;

[0017] Figure 5 It is a partial cross-sectional view of the warning bin of the utility model.

[0018] Among them: 1. plunger, 2. high-pressure chamber, 3. high-pressure pipe, 4. shell, 5. low-pressure chamber, 7. low-pressure pipe, 8. tension spring, 9. moving magnet, 10. warning chamber, 11. limit ring, 12. guide rod, 13. ferromagnetic plate, 14. baffle, 15. conductive ring, 16. oil drain groove, 17. connecting hole, 18. pressure discharge hole, 19. pressure discharge pipe, 20. sleeve, 21. hollow bolt, 22. sealing plate, 23. shrink tube, 24. filter plate, 25. tapered tube, 26. oil pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1-3 As shown in Figures 5 and 6, an embodiment of the utility model provides a fuel filter pressure difference signal device, including a housing 4, a plunger 1 sliding inside the housing 4, the housing 4 at the upper end of the plunger 1 is a high-pressure chamber 2, the high-pressure chamber 2 is connected to a high-pressure pipe 3, the housing 4 at the lower end is a low-pressure chamber 5, the low-pressure chamber 5 is connected to a low-pressure pipe 7, the top surface of the plunger 1 is connected to the housing 4 through a tension spring 8, a moving magnet 9 is provided on the bottom surface of the plunger 1, a warning chamber 10 is connected to the bottom surface of the housing 4, a limiting ring 11 is provided inside the warning chamber 10, a guide rod 12 slides inside the limiting ring 11, a ferromagnetic plate 13 is provided at the top end of the guide rod 12, a baffle 14 is provided at the bottom end of the guide rod 12, a conductive ring 15 is provided on the side of the baffle 14 and the limiting ring 11 close to each other, and the conductive ring 15 is electrically connected to a warning device. The warning device is a prior art. The ferromagnetic plate 13 is an existing metal plate that can be attracted by a magnet, and the ferromagnetic plate 13 can also be a magnet, and the sensitivity can be improved by the attraction of the magnets. The plunger 1 is slidably and hermetically connected to the inner wall of the housing 4. The warning device and its electrical connection are prior art.

[0021] During use, the high-pressure pipe 3 is connected to the high-pressure oil pipe before filtration, and the low-pressure pipe 7 is connected to the low-pressure oil pipe after filtration. The high-pressure oil enters the high-pressure chamber 2 through the high-pressure pipe 3, and the low-pressure oil enters the low-pressure chamber 5 through the low-pressure pipe 7. When the pressure difference between the high-pressure chamber 2 and the low-pressure chamber 5 is large, the high-pressure oil overcomes the tension of the tension spring 8 and the pressure of the bottom pressure chamber, so that the plunger 1 moves toward the bottom end of the shell 4. When the moving magnet 9 is against the bottom of the shell 4, the magnetic field of the moving magnet 9 passes through the shell 4 and attracts the ferromagnetic plate 13 to move toward the shell 4. The ferromagnetic plate 13 passes through the shell 4. The baffle 14 is driven by the guide rod 12 to move toward the limit ring 11. When the baffle 14 and the conductive ring 15 of the limit ring 11 are against each other, the circuit of the warning device is connected, and the warning device sounds an alarm. When the pressure difference between the high-pressure chamber 2 and the low-pressure chamber 5 is restored, the plunger 1 drives the moving magnet 9 to move upward under the tension of the tension spring 8. After the moving magnet 9 is away from the bottom of the shell 4, the attraction of the ferromagnetic plate 13 is weakened. The ferromagnetic plate 13, the guide plate and the baffle 14 are away from the shell 4 under the action of gravity, so that the conductive rings 15 are away from each other and the circuit of the warning device is disconnected. By setting an independent warning chamber 10 below the shell 4, the circuit is completely isolated from the oil, effectively avoiding the electric sparks or arcs that may be generated by the contact of the conductive ring 15 directly contacting the fuel, thereby greatly reducing the risk of fire caused by electrical faults and significantly improving the safety of the entire fuel system.

[0022] like Figure 2-4 As shown, the side wall of the plunger 1 is provided with an oil drain groove 16, which is connected to the high-pressure chamber 2 through a connecting hole 17 in the plunger 1, and the side wall of the low-pressure chamber 5 is provided with a pressure discharge hole 18, which is connected to the low-pressure pipe 7 through a pressure discharge pipe 19. When the plunger 1 moves to the bottom end of the housing 4, the oil drain groove 16 is connected to the pressure discharge hole 18, and the plunger 1 closes the low-pressure pipe 7. In order to prevent the pressure in the high-pressure chamber 2 from being too high, when the plunger 1 moves downward to the bottom end of the housing 4, the oil drain groove 16 is connected to the pressure discharge hole 18, so that a part of the oil enters the low-pressure pipe 7 through the pressure discharge hole 18 and the pressure discharge pipe 19. A perforated plate can be set at the pressure discharge hole 18, which can play a role in preliminary filtering of the oil, and the perforated plate can play a certain role in hindering the oil, preventing the oil from quickly flowing into the low-pressure pipe 7. Closing the low-pressure pipe 7 by the plunger 1 can prevent the oil from directly entering the low-pressure pipe 7 from the oil drain groove 16. The connection between the oil drain groove 16 and the pressure relief hole 18 can automatically release part of the pressure in the high-pressure chamber 2, preventing equipment damage or safety hazards caused by excessive pressure, and promoting the circulation of oil between the high-pressure chamber 2 and the low-pressure chamber 5.

[0023] like Figure 3-4As shown, the outer wall of the housing 4 is provided with a sleeve 20 corresponding to the pressure discharge hole 18, and a hollow bolt 21 is sealed and screwed in the sleeve 20. The end of the hollow bolt 21 close to the pressure discharge hole 18 is connected to a sealing plate 22 through a pressure regulating spring. The sealing plate 22 can close the pressure discharge hole 18, and a gap is provided between the sealing plate 22 and the inner wall of the sleeve 20. The pressure discharge pipe 19 is connected to the hollow bolt 21 in a rotatable and sealed manner. In order to adjust the sensitivity of the pressure discharge, the pressure of the pressure regulating spring on the sealing plate 22 can be finely adjusted by rotating the hollow bolt 21, so as to accurately control the oil pressure threshold required to open the sealing plate 22, so that the oil at the oil discharge groove 16 needs to have a higher pressure to push the sealing plate 22, and is discharged into the low-pressure pipe 7 through the gap between the sealing plate 22 and the inner wall of the sleeve 20, which not only ensures that the oil can be discharged smoothly after reaching the set pressure, but also avoids the leakage of the oil under normal pressure, reducing unnecessary energy loss and environmental pollution.

[0024] like Figure 1-2 As shown, the high-pressure pipe 3 and the low-pressure pipe 7 are connected by a contraction pipe 23, and a filter plate 24 is inherently provided in the contraction pipe 23 between the high-pressure pipe 3 and the low-pressure pipe 7. Both ends of the contraction pipe 23 are connected with a tapered pipe 25, and the large end of the tapered pipe 25 is connected to the oil pipe 26. The large end of the tapered pipe 25 is connected to the contraction pipe 23, which helps the oil to gradually decelerate and stabilize the flow field before entering the contraction pipe 23, reduces the formation of turbulence and eddy currents, helps to measure the pressure difference more accurately, and reduces the error caused by the unstable flow field. The design of the tapered pipe 25 and the contraction pipe 23 makes the entire connection structure more compact, effectively reduces the space occupied, and makes the equipment layout more compact.

[0025] like Figure 1-2 As shown, the high-pressure pipe 3 and the low-pressure pipe 7 are both connected to the side wall of the tapered pipe 25, and the tapered pipe 25 and the high-pressure pipe 3 and the low-pressure pipe 7 are connected at the points where they are transitioned through rounded corners. The axis of the high-pressure pipe 3 is parallel to the axis of the contraction tube 23, and the low-pressure pipe 7 is L-shaped, and one end of the low-pressure pipe 7 connected to the tapered pipe 25 is a vertical end, and the other end is a horizontal end. By setting the high-pressure pipe 3 with parallel axes, it can be ensured that the oil can flow smoothly into the high-pressure chamber 2, reducing the vortex generated by the oil in the path. The L-shaped low-pressure pipe 7 can also guide the oil, which can more effectively collect and guide the oil into the low-pressure system, thereby improving the transmission efficiency of the fluid.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuel filter pressure differential signal device, characterized in that: The invention comprises a shell (4), a plunger (1) slidingly arranged in the shell (4), the shell (4) at the upper end of the plunger (1) being a high-pressure chamber (2), the high-pressure chamber (2) being connected to a high-pressure pipe (3), the shell (4) at the lower end being a low-pressure chamber (5), the low-pressure chamber (5) being connected to a low-pressure pipe (7), the top surface of the plunger (1) being connected to the shell (4) via a tension spring (8), the bottom surface of the plunger (1) being provided with a moving magnet (9), the bottom surface of the shell (4) being connected to a warning chamber (10), a limiting ring (11) being provided in the warning chamber (10), a guide rod (12) slidingly arranged in the limiting ring (11), a ferromagnetic plate (13) being provided at the top end of the guide rod (12), a baffle (14) being provided at the bottom end of the guide rod (12), a conductive ring (15) being provided on the side where the baffle (14) and the limiting ring (11) are close to each other, and the conductive ring (15) is electrically connected to a warning device.

2. A fuel filter pressure difference signal device according to claim 1, characterized in that: The side wall of the plunger (1) is provided with an oil drain groove (16), which is connected to the high-pressure chamber (2) through a connecting hole (17) in the plunger (1). The side wall of the low-pressure chamber (5) is provided with a pressure discharge hole (18), which is connected to the low-pressure pipe (7) through a pressure discharge pipe (19). When the plunger (1) moves to the bottom end of the housing (4), the oil drain groove (16) is connected to the pressure discharge hole (18), and the plunger (1) closes the low-pressure pipe (7).

3. A fuel filter pressure difference signal device according to claim 2, characterized in that: The outer wall of the housing (4) is provided with a sleeve (20) corresponding to the pressure discharge hole (18), a hollow bolt (21) is threadedly sealed inside the sleeve (20), one end of the hollow bolt (21) close to the pressure discharge hole (18) is connected to a sealing plate (22) via a pressure regulating spring, the sealing plate (22) can seal the pressure discharge hole (18), and a gap is provided between the sealing plate (22) and the inner wall of the sleeve (20), and the pressure discharge pipe (19) is rotatably sealedly connected to the hollow bolt (21).

4. A fuel filter pressure difference signal device according to claim 1, characterized in that: The high-pressure pipe (3) and the low-pressure pipe (7) are connected by a contraction pipe (23), a filter plate (24) is inherently provided in the contraction pipe (23) between the high-pressure pipe (3) and the low-pressure pipe (7), both ends of the contraction pipe (23) are connected to a tapered pipe (25), and the large end of the tapered pipe (25) is connected to an oil pipe (26).

5. A fuel filter pressure difference signal device according to claim 4, characterized in that: The high-pressure tube (3) and the low-pressure tube (7) are both connected to the side wall of the tapered tube (25); the tapered tube (25) and the high-pressure tube (3) and the low-pressure tube (7) are connected at a rounded transition; the axis of the high-pressure tube (3) is parallel to the axis of the contraction tube (23); the low-pressure tube (7) is L-shaped; one end of the low-pressure tube (7) connected to the tapered tube (25) is a vertical end, and the other end is a horizontal end.

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