JP4631891B2 - Fuel filtration device - Google Patents

Description

  The present invention relates to a fuel filtering device, and is suitably applied to a fuel filtering device that performs fuel filtering in a fuel supply device that supplies fuel to an internal combustion engine such as a diesel engine.

  A fuel filtering device is a fuel supply device that supplies fuel to, for example, a diesel engine, and is provided between a fuel tank and a fuel injection pump, and captures organic foreign matter such as dust and inorganic foreign matter such as metal in the fuel. It is. The fuel filter device includes a filter body formed of a filter medium that traps material particles in the fuel.

Since the filter body cannot capture metal ions in the fuel, a filter to which a metal ion trapping material that traps metal ions in the fuel is added is disclosed (see Patent Document 1). In Patent Document 1, a configuration in which an ion trapping device containing a metal ion trapping material is provided in the middle of a fuel path between a fuel tank and a fuel injection pump, and a metal ion trapping material is built in the fuel filter device separately from the fuel filter device. A configuration is disclosed.
JP 2006-105092 A

  Although not described in Patent Document 1, in the configuration in which metal ions in the fuel are trapped through the fuel through the metal ion trapping material, the metal ion removal performance by the metal ion trapping material cannot be exhibited efficiently. This is because metal ions are generally more likely to be present in an aqueous solution than oil (non-aqueous solution) such as fuel, and are present in water particles in the fuel. That is, since the metal ion trapping material captures metal ions present in a small part of the water particles in the fuel, the metal ion scavenging material can efficiently exhibit the metal ion removal performance. Can not.

  Further, when the metal ion trapping material is provided as a separate device from the fuel filtering device, a container for newly storing the metal ion trapping material is required. Therefore, a configuration in which the metal ion trapping material is built in the fuel filtering device is desirable.

  The present invention has been made in consideration of such circumstances, and the object thereof is to efficiently exhibit the metal ion removal performance of the metal ion trapping material in the fuel filtration device incorporating the metal ion trapping material. For the purpose.

  In order to achieve the above object, the present invention employs the following technical means.

  The fuel filter device according to claim 1, wherein the first filter body formed of a metal ion trapping material that traps metal ions in the fuel and the second filter body formed of a filter medium that traps material particles in the fuel. And a case for housing the first filter body and the second filter body, a water storage space in which water separated from the fuel is stored is provided below the second filter body in the case, and the first filter It is characterized in that at least a part of the body is arranged in the water storage space.

  In this configuration, a water storage space in which water separated from the fuel is stored is provided below the second filter body in the case, and at least the first filter body formed of the metal ion trapping material is provided in the water storage space. Some have been placed. Thereby, the first filter body can capture the metal ions directly from the stored water in contact with the stored water in the water storage space below the second filter body. For this reason, it becomes possible to efficiently exhibit the metal ion removal performance by the first filter body, that is, the metal ion removal performance by the metal ion trapping material. Therefore, in the fuel filtration device incorporating the metal ion trapping material, the metal ion removal performance of the metal ion trapping material can be exhibited efficiently.

  The fuel filtration device according to claim 2, wherein the second filter body is disposed on the fuel downstream side of the first filter body, is disposed on the second filter body side, has water repellency, and has water repellency and allows water to pass therethrough. It is characterized by providing.

  In this configuration, the second filter body is disposed on the fuel downstream side of the first filter body, and the water repellent means is disposed on the second filter body side. For this reason, water permeation to the second filter body side is suppressed by water repellency of the water repellent means, but water permeation to the first filter body is not suppressed by water repellency of the water repellent means. Thereby, it can suppress that a water | moisture content flows out from a fuel filtration apparatus, without preventing the capture | acquisition of the metal ion by a 1st filter body.

  The fuel filter device according to claim 3, wherein the first filter body is disposed on the fuel downstream side of the second filter body, is disposed on the fuel downstream side of the first filter body in the case, and has water repellency. A water repellent means for allowing the fuel to pass therethrough is provided.

  In this configuration, since the first filter body is disposed on the fuel downstream side of the second filter body and the water repellent means is disposed on the fuel downstream side of the first filter body, water enters the first filter body. This cannot be suppressed by the water repellency of the water repellent means. Thereby, it can suppress that a water | moisture content flows out from a fuel filtration apparatus, without preventing the capture | acquisition of the metal ion by a 1st filter body.

  According to a fourth aspect of the present invention, there is provided a fuel filtration device including a drain valve that is disposed at a position that does not interfere with the first filter body at the bottom of the case and that drains water stored in the water storage space.

  In this structure, since the drain valve is arrange | positioned in the position which does not interfere with a 1st filter body in the bottom part of a case, the water stored by the water storage space can be discharged | emitted, ensuring the above-mentioned effect.

  The fuel filtering device according to claim 5 is arranged at a position where it does not interfere with both the first filter body and the drain valve at the bottom of the case, and when the water level stored in the water storage space reaches a predetermined level. A level switch for issuing a warning signal is provided.

  In this configuration, since the level switch is arranged at a position where the bottom of the case does not interfere with both the first filter body and the drain valve, the level of the stored water in the water storage space is kept at a predetermined level while ensuring the above-described effect. It becomes possible to recognize that it has reached.

  According to a sixth aspect of the present invention, there is provided a fuel filtering device including a housing case that houses the first filter body and has a plurality of openings formed therein.

  In this structure, the 1st filter body is accommodated in the storage case in which the some opening was formed. For this reason, capture of metal ions by the first filter body is ensured through the opening, and the first filter body housed in the housing case and unitized can be easily replaced alone.

  Hereinafter, the case where the fuel filtration device of the present invention is applied to a fuel supply device will be described with reference to the drawings.

(First embodiment)
In FIG. 1, a fuel supply device 20 includes a fuel tank 21, a fuel filtration device 1, a fuel injection pump 22, a common rail 23, a fuel injection valve 24, a pipe 25 connecting them, an engine control unit (hereinafter referred to as “fuel control device”). , ECU) 12. The fuel 21 </ b> A stored in the fuel tank 21 is sent to the common rail 23 by the fuel injection pump 22 via the fuel filtering device 1, and is stored in the common rail 23 in a high pressure state. The high-pressure fuel stored in the common rail 23 is supplied to the fuel injection valve 24 and is supplied from the fuel injection valve 24 to an internal combustion engine (not shown).

  Each operation of the fuel injection pump 22, the common rail 23, and the fuel injection valve 24 is controlled by the ECU 12, which is a microcomputer having a well-known structure, and is controlled so as to be supplied from the common rail 23 to the fuel injection valve 24 at a timing when fuel efficiency increases. The

  Here, in the fuel 21 </ b> A sent from the fuel tank 21 into the fuel filtering device 1, foreign matters (metal ions and substance particles) in the fuel 21 </ b> A are captured in the fuel filtering device 1 and sent to the fuel injection pump 22. . The fuel 21 </ b> A flows into the fuel filtering device 1 from the inlet pipe 2 that forms part of the pipe 25, and flows out from the outlet pipe 3 that forms part of the pipe 25. The fuel filtering device 1 includes a level switch 11 described later, and the ECU 12 is configured to turn on an indicator (not shown) in response to a warning signal from the level switch 11.

  As shown in FIG. 2, the fuel filtering device 1 includes a first filter body 4, a second filter body 5, a water repellent sheet 6 that is a water repellent means, a case 9, a drain valve 10, and a level switch 11. With.

  The case 9 is formed by removably fixing the housing 7 and the filter case 8 with screws or the like (not shown), and accommodates the first filter body 4 and the second filter body 5. An inlet pipe 2 into which the fuel 21A flows into the fuel filtering device 1 and an outlet pipe 3 from which the fuel 21A flows out from the fuel filtering device 1 are fixed to the housing 7, and the fuel filtering device 1 has flow paths F1, F2, and F3. , F4, F5, the fuel 21A is configured to pass through the first filter body 4 and the second filter body 5. A segment 81, which is a water storage space in which water 81 </ b> A separated from the fuel 21 </ b> A using the specific gravity difference between the fuel 21 </ b> A and water is stored, is provided in the case 9 below the second filter body 5.

  The first filter body 4 is formed of a metal ion trapping material that traps metal ions in the fuel 21 </ b> A that passes through the first filter body 4. The metal ion trapping material is, for example, a small granular chelate resin (CR20 manufactured by Mitsubishi Chemical Corporation), and the chelate resin traps metal ions by forming a chelate (complex) with the metal ions. By forming the chelate resin into small particles, the surface area of the first filter body 4 is increased, thereby enhancing the metal ion trapping performance of the first filter body 4.

  Instead of forming the chelate resin into small particles, for example, the surface area of the first filter body 4 can be increased by forming the chelate resin into a fibrous shape or the like. Further, the metal ion trapping material may be an ion exchange resin that traps metal ions using ion exchange instead of the chelate resin, and the first filter body 4 may be formed of an ion exchange resin.

  The small granular first filter body 4 is filled in a mesh 41, and the mesh 41 filled with the first filter body 4 is held by a pipe-shaped pipe case 42. A plurality of openings 421 are formed in the pipe case 42, and the first filter body 4 can come into contact with the fuel 21 </ b> A and the water 81 </ b> A through the holes of the mesh 41 and the openings 421 of the pipe case 42. The mesh 41 and the pipe case 42 constitute a housing case for housing the first filter body 4, and the holes of the mesh 41 and the openings 421 of the pipe case 42 constitute a plurality of openings formed in the housing case.

  Thereby, the first filter body 4 can capture metal ions from the fuel 21 </ b> A and the water 81 </ b> A stored in the segment 81 through the hole of the mesh 41 and the opening 421 of the pipe case 42. Moreover, since the 1st filter body 4 is accommodated in the mesh 41 and the pipe case 42, and is unitized, it can replace | exchange easily alone.

  At least a part of the first filter body 4 is disposed in the segment 81. Here, in general, metal ions are more likely to be present in an aqueous solution than oil (non-aqueous solution) such as fuel, and are present in water particles in the fuel 21A. For this reason, since the first filter body 4 can only capture the metal ions present in only a part of the water particles in the fuel 21A from the fuel 21A that has passed through the first filter body 4, the first filter body 4 Metal ions cannot be efficiently captured from the fuel 21A that has passed through the body 4.

  On the other hand, since at least a part of the first filter body 4 is disposed in the segment 81, this part comes into contact with the water 81A stored in the segment 81, and from this water 81A. Can capture metal ions directly. For this reason, it becomes possible to exhibit the metal ion removal performance by the 1st filter body 4 efficiently.

  The second filter body 5 is formed of a filter medium that traps material particles in the fuel 21 </ b> A that passes through the second filter body 5. The filter medium is formed of a filter paper or a non-woven fabric having a pore size capable of capturing substance particles. The shape of the filter medium is, for example, a cylindrical type, but may be a spiral type, a honeycomb type, or a chrysanthemum type.

  The second filter body 5 is disposed downstream of the first filter body 4 in the flow direction of the fuel 21A, and the first filter body 4 and the second filter body 5 are arranged in the flow direction of the fuel 21A (in FIG. (Wrapped in the direction). The first filter body 4 is disposed on the inner peripheral side of the center pipe 51 and the second filter body 5 is disposed on the outer peripheral side of the center pipe 51 with the center pipe 51 constituting the internal passage of the fuel 21A interposed therebetween. An O-ring (not shown) is provided between the pipe case 42 and the center pipe 51 to seal between them. An annular plate-like lower support member (not shown) formed of a metal such as a spring material is locked to the side wall of the filter case 8, and the central pipe 51 is supported by the lower support member. The lower support member is formed with a plurality of openings so that the fuel 21A can flow through the lower support member.

  The water repellent sheet 6 that is a water repellent means has water repellency and a function of allowing the fuel 21 </ b> A to pass through, and is disposed on the second filter body 5 side. Specifically, the water repellent sheet 6 is disposed on the bottom surface (surface on the upstream side of the fuel 21 </ b> A) of the second filter body 5. For this reason, the infiltration of water into the second filter body 5 is suppressed by the water repellency of the water repellent sheet 6, but the intrusion of water into the first filter body 4 is suppressed by the water repellency of the water repellent sheet 6. I can't. Thereby, it can maintain that the 1st filter body 4 capture | acquires a metal ion directly from the water 81A currently stored in the sediment 81. FIG. Therefore, it is possible to prevent moisture from flowing out from the fuel filtering device 1 without hindering the capture of metal ions by the first filter body 4.

  The drain valve 10 is a valve that discharges the water 81 </ b> A stored in the sediment 81, and is disposed at a position that does not interfere with the first filter body 4 at the bottom 82 of the case 9 (filter case 8). The level switch 11 is a switch that issues a warning signal when the water level 81B of the water 81A stored in the segment 81 reaches a predetermined level. Both the first filter body 4 and the drain valve 10 are provided at the bottom 82 of the case 9. It is arranged at the position where it does not interfere with.

  In response to the warning signal from the level switch 11, the ECU 12 turns on an indicator (not shown). By turning on the indicator, it is possible to recognize that the water level 81B of the water 81A stored in the segment 81 has reached a predetermined level.

  In the above configuration, the operation of the fuel filtering device 1 will be described.

  According to the flow path F1, the fuel 21A flows into the fuel filtering device 1 from the inlet pipe 2, passes through the mesh 41, and the metal ions in the fuel 21A are captured by the first filter body 4. Furthermore, since the first filter body 4 comes into contact with the water 81A stored in the segment 81 and captures the metal ions directly from the water 81A, the metal ion removal performance by the first filter body 4 is improved. It is possible to make it manifest.

  According to the flow path F2, the fuel 21A from which the metal ions have been removed flows into the second filter body 5 through the water repellent sheet 6, and the substance particles in the fuel 21A are captured. The fuel 21A from which the metal ions have been removed by the first filter body 4 and the material particles have been removed by the second filter body 5 flows out from the outlet pipe 3 along the flow paths F3, F4, F5. In particular, since the removal performance of the metal ions by the first filter body 4 is efficiently exhibited, the fuel 21A containing almost no metal ions is injected from the outlet pipe 3 through the fuel injection pump 22 and the common rail 23. The valve 24 can be supplied. As a result, metal deposition / deposition in the fuel injection valve 24 can be suppressed, and the fuel injection valve 24 can be driven stably for a long period of time.

  Moreover, since the 1st filter body 4 is accommodated in the mesh 41 and the pipe case 42, and is unitized, the filter case 8 is removed from the case 9, and the 1st filter body 4 and the 2nd filter body 5 are each, Can be easily replaced alone.

  As described above, the fuel filtering device 1 according to the first embodiment of the present invention includes the first filter body 4 formed of the metal ion capturing material that captures the metal ions in the fuel 21A and the filter medium that captures the material particles in the fuel 21A. The second filter body 5 formed in the above, and the case 9 that accommodates the first filter body 4 and the second filter body 5, and a sediment 81 that is a water storage space in which water separated from the fuel 21A is stored is provided. The case 9 is provided below the second filter body 5, and at least a part of the first filter body 4 is disposed in the segment 81.

  Thereby, in the fuel filtration device incorporating the metal ion trapping material, the metal ion removal performance of the metal ion trapping material can be efficiently exhibited.

(Second Embodiment)
In the first embodiment, the second filter body 5 is arranged on the downstream side in the flow direction of the fuel 21A with respect to the first filter body 4, but in the second embodiment, as shown in FIG. The filter body 4 is disposed downstream of the second filter body 5 in the flow direction of the fuel 21A. Specifically, instead of the inlet pipe 2 and the outlet pipe 3, the inlet 21A that guides the fuel 21A to the second filter body 5 according to the flow paths F11, F12, and F13, and the first filtration of the fuel 21A according to the flow path F15. An outlet pipe 3 </ b> A that flows out from the body 4 is fixed to the housing 7. Thus, the fuel filtering device 1A is configured such that the fuel 21A passes through the second filter body 5 and the first filter body 4 in this order according to the flow paths F11, F12, F13, F14, and F15.

  Instead of the water repellent sheet 6, the water repellent sheet 6 </ b> A is disposed in the case 9 on the downstream side of the fuel 21 </ b> A of the first filter body 4. Specifically, the water repellent sheet 6A is disposed on the upper surface of the first filter body 4 (the surface on the downstream side of the fuel 21A). For this reason, the infiltration of water into the first filter body 4 cannot be suppressed by the water repellency of the water repellent sheet 6A. Thereby, it can maintain that the 1st filter body 4 capture | acquires a metal ion directly from the water 81A currently stored in the sediment 81. FIG. Therefore, it is possible to suppress the outflow of moisture from the fuel filtering device 1A without hindering the capture of metal ions by the first filter body 4.

  The fuel 21A flows into the fuel filtering device 1A from the inlet pipe 2A according to the flow path F11, flows into the second filter body 5 according to the flow paths F12 and F13, and the substance particles in the fuel 21A are captured. The The fuel 21A from which the material particles have been removed passes through the mesh 41 according to the flow path F14, and the metal ions in the fuel 21A are captured by the first filter body 4. Furthermore, since the first filter body 4 comes into contact with the water 81A stored in the segment 81 and captures the metal ions directly from the water 81A, the metal ion removal performance by the first filter body 4 is improved. It is possible to make it manifest.

  The fuel 21A from which the material particles have been removed by the second filter body 5 and the metal ions have been removed by the first filter body 4 flows out from the outlet pipe 3A according to the flow path F15. Thereby, the effect similar to the above-mentioned embodiment can be acquired.

(Third embodiment)
In the above-described embodiment, the first filter body 4 is disposed on the inner peripheral side of the center pipe 51 and the second filter body 5 is disposed on the outer peripheral side of the center pipe 51 with the center pipe 51 interposed therebetween. On the other hand, in the third embodiment, as shown in FIG. 4, instead of the center pipe 51, a center pipe 51 </ b> A is provided, and the center pipe 51 </ b> A is sandwiched between the first filter body 4 instead of the first filter body 4. 4A is arranged on the outer peripheral side of the center pipe 51A, and the second filter body 5A is arranged on the inner peripheral side of the center pipe 51A instead of the second filter body 5.

  The central pipe 51A is joined to the inlet pipe 2 so that the fuel 21A can be guided to the second filter body 5A according to the flow path F21, and the water-repellent sheet 6B is replaced with the first filter body 4A instead of the water-repellent sheets 6 and 6A. Is disposed on the upper surface (surface on the downstream side of the fuel 21A). For this reason, the infiltration of water into the first filter body 4A cannot be suppressed by the water repellency of the water repellent sheet 6B. Thereby, it can maintain that 4 A of 1st filter bodies capture | acquire a metal ion directly from the water 81A stored in the sediment 81. FIG. Therefore, it is possible to suppress the outflow of moisture from the fuel filter device 1B without preventing the capture of the metal ions by the first filter body 4A.

  The fuel 21A flows into the fuel filtering device 1B from the inlet pipe 2 according to the flow path F21, flows into the second filter body 5A, and the substance particles in the fuel 21A are captured. The fuel 21A from which the material particles have been removed passes through the mesh 41A according to the flow path F22, and metal ions in the fuel 21A are captured by the first filter body 4A. Furthermore, since the first filter body 4A comes into contact with the water 81A stored in the sediment 81 and captures metal ions directly from the water 81A, the removal performance of the metal ions by the first filter body 4A is improved. It is possible to make it manifest.

  The fuel 21A from which the material particles have been removed by the second filter body 5A and the metal ions have been removed by the first filter body 4A flows out from the outlet pipe 3 according to the flow paths F23, F24, and F25. Thereby, the effect similar to the above-mentioned embodiment can be acquired.

  In addition, it is not restricted to the example mentioned above, These combinations and other various modifications can be considered.

It is a typical block diagram which shows the fuel supply apparatus 20 to which the fuel filtration apparatus 1 by 1st Embodiment of this invention is applied. 1 is a schematic cross-sectional view showing a fuel filtration device 1 according to a first embodiment of the present invention. It is a typical sectional view showing fuel filtration device 1A by a 2nd embodiment of the present invention. It is typical sectional drawing which shows the fuel filtration apparatus 1B of 3rd Embodiment.

Explanation of symbols

1, 1A, 1B Fuel filtration device, 2, 2A inlet piping, 3, 3A outlet piping 4, 4A 1st filter body, 41, 41A Mesh (containment case)
42, 42A Pipe case (accommodating case), 421, 421A Opening 5, 5A Second filter body, 51, 51A Center pipe 6, 6A, 6B Water repellent sheet (water repellent means), 7 Housing (case)
8 Filter Case (Case), 81 Sedimentor (Water Storage Space), 81A Water 81B Water Level, 82 Bottom, 9 Case, 10 Drain Valve, 11 Level Switch 12 ECU (Engine Control Unit), 20 Fuel Supply Device, 21 Fuel Tank 21A Fuel , 22 Fuel injection pump, 23 Common rail, 24 Fuel injection valve 25 Piping

Claims (6)

A first filter body formed of a metal ion trapping material that traps metal ions in the fuel;
A second filter body formed of a filter medium that traps material particles in the fuel;
A case for housing the first filter body and the second filter body;
A water storage space in which water separated from the fuel is stored is provided below the second filter body in the case;
A fuel filtering device, wherein at least a part of the first filter body is disposed in the water storage space. The second filter body is disposed on the fuel downstream side of the first filter body,
2. The fuel filtration device according to claim 1, further comprising water repellency means disposed on the second filter body side and having water repellency and allowing the fuel to pass therethrough. The first filter body is disposed on the fuel downstream side of the second filter body,
2. The fuel filter device according to claim 1, further comprising water repellent means disposed on the fuel downstream side of the first filter body in the case and having water repellency and allowing the fuel to pass therethrough.   The drain valve which is arrange | positioned in the position which does not interfere with the said 1st filter body in the bottom part of the said case, and discharges the water currently stored in the said water storage space is provided. The fuel filtration device according to item.   A level switch that is arranged at a position that does not interfere with both the first filter body and the drain valve at the bottom of the case, and that issues a warning signal when the water level stored in the water storage space reaches a predetermined level The fuel filtering device according to claim 4, further comprising:   The fuel filtering device according to any one of claims 1 to 5, further comprising a housing case that houses the first filter body and has a plurality of openings formed therein.

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