JP5625874B2 - Fuel filter - Google Patents

Description

  The present invention relates to a fuel filter that adsorbs metal ions in fuel by ion exchange.

  In fuel injection systems for diesel engines, when fatty acids such as oleic acid, which are components such as lubricants added to the fuel, react with metal ions such as Na and K in the fuel, oleic acid Na insoluble in light oil, etc. There is a problem that the fatty acid salt is generated and the fatty acid salt is deposited on the sliding portion of the injector and the like, and the fuel injection system components such as the injector cause malfunction.

  In view of this, a method has been proposed in which an ion exchanger is disposed in the fuel path, a metal component in the fuel is adsorbed on the ion exchanger by ion exchange, and the metal component in the fuel is removed (see, for example, Patent Document 1). ).

JP 2006-105092 A

  However, since the ion exchange resin is generally a sphere of about 0.1 to 1 mm, when this is filled in the filter case, the pressure loss rises when the fuel passes through the ion exchange resin layer, and the flow rate decreases. In the case of negative pressure suction, problems such as cavitation occur. Similar problems also occur when ion exchangers other than ion exchange resins are used.

  In view of the above points, an object of the present invention is to reduce pressure loss when fuel passes through a layer of an ion exchanger.

  In order to achieve the above object, according to the first aspect of the present invention, in the fuel filter that adsorbs metal ions in the fuel flowing through the filter case (1) by the ion exchanger (5), the ion exchanger (5 ) And a plurality of filling cases (4) through which the fuel flows, and the plurality of filling cases (4) are arranged in parallel to the fuel flow.

  According to this, the amount of fuel passing through each filling case (4) is reduced, and the path length of the layer of the ion exchanger (5) (that is, the thickness of the layer of the ion exchanger (5)) is reduced. Combined with the shortening, the pressure loss when the fuel passes through the layer of the ion exchanger (5) is reduced.

In the invention described in claim 1, a plurality of Filling case (4) are each formed in a flat annular, characterized in that along the vertical direction are stacked to form a predetermined gap. According to this, it can avoid that filter case (1) enlarges to radial direction.

Further, the invention according to claim 1, in each of the plurality of packing case (4), the fuel flows into the filling casing (4) from the inner periphery of the filling casing (4), the ion exchanger (5 wherein the layer to the outlet to fill the case (4) out of the bottom of the plurality of through holes (41) and through and fill casing located at the bottom (4) of passing in the vertical direction filled casing (4) of) And

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a figure showing typically a fuel filter concerning one embodiment of the present invention. It is an expanded sectional view of the A section of FIG. It is a figure which shows the manufacturing method of the inlet piping and filling case of FIG. It is a figure showing typically the modification of the fuel filter concerning one embodiment.

  An embodiment of the present invention will be described. FIG. 1 is a diagram schematically showing a fuel filter according to the present embodiment, and FIG. 2 is an enlarged cross-sectional view of a portion A in FIG.

  As shown in FIGS. 1 and 2, the fuel filter includes a hollow filter case 1 through which fuel flows, and an inlet pipe 2 and an outlet pipe 3 are connected to the filter case 1. The inlet pipe 2 has a bottomed cylindrical shape, and one end side serving as a fuel inlet portion protrudes from the upper end surface of the filter case 1, and the other end side enters the filter case 1. The outlet pipe 3 is cylindrical and protrudes from the lower end surface of the filter case 1. Therefore, in this example, the fuel flows into the filter case 1 from above the filter case 1 and flows out from below the filter case 1.

  In the inlet pipe 2, a plurality of (five in this example) filling cases 4 are integrally provided at a site in the filter case 1 so as to surround the inlet pipe 2. The filling case 4 is formed in a hollow and flat annular shape, and is laminated in a vertical direction.

  The space inside the filling case 4 is filled with an ion exchanger 5 having ion exchange ability. In addition, as the ion exchanger 5, an ion exchange resin, an ion exchange cellulose, an ion exchange fiber, etc. can be used.

  An opening 21 that connects the inside of the inlet pipe 2 and the inside of the filling case 4 is formed in a part of the inlet pipe 2 that is surrounded by the filling case 4, and a partition plate part 22 that prevents the ion exchanger 5 from being dispersed. Is formed. Note that a plurality of openings 21 may be provided along the circumferential direction of the inlet pipe 2, or one opening that is continuous over the entire circumference of the inlet pipe 2.

  A large number of through-holes 41 are formed in the bottom of the filling case 4 to allow the inside of the filter case 1 and the inside of the filling case 4 to communicate with each other. Instead of forming the through hole 41, the bottom of the filling case 4 may be formed in a mesh shape.

  The inlet pipe 2 and the filling case 4 are integrally formed of resin, and a method for manufacturing the inlet pipe 2 and the filling case 4 will be described. First, as shown in FIG. 3A, two divided bodies 2A having a shape divided into two along the axis of the inlet pipe 2 are prepared, and the ion exchanger 5 is opened in one divided body 2A. Fill from 21.

  Next, in a state where the divided body 2A filled with the ion exchanger 5 is disposed below (the state shown in FIG. 3A), the divided body 2A filled with the ion exchanger 5 and the ion exchanger 5 are filled. The divided body 2A is joined by welding or the like.

  Next, as shown in FIG. 3 (b), a part of the ion exchanger 5 filled in one divided body 2A is moved to the other divided body 2A side, so that the entire area in the filling case 4 is substantially reduced. The ion exchanger 5 is arranged uniformly.

  In the above configuration, the fuel guided to the inlet pipe 2 flows into the filling case 4 through the opening 21 located in the inner peripheral portion of the filling case 4, passes through the layer of the ion exchanger 5, and then fills It flows out of the filling case 4 through the through hole 41 located at the bottom of the case 4, and further flows toward the outlet pipe 3. And when a fuel passes the layer of the ion exchanger 5, the metal component in a fuel is adsorbed by the ion exchanger 5 by ion exchange, and the metal component in a fuel is removed.

  Here, the fuel guided to the inlet pipe 2 branches and flows into the plurality of filling cases 4, passes through the plurality of filling cases 4, joins, and travels toward the outlet pipe 3. In other words, the plurality of filling cases 4 are arranged in parallel to the fuel flow. Therefore, the amount of fuel passing through each filling case 4 is smaller than when a plurality of filling cases 4 are arranged in series with respect to the fuel flow.

  Further, since the ion exchanger 5 is divided into a plurality of filling cases 4 and filled, the passage length of the layer of the ion exchanger 5 (that is, the case where the ion exchanger 5 is filled in one filling case 4 (that is, The layer thickness of the ion exchanger 5) is shortened.

  In this way, the amount of fuel passing through each filling case 4 is reduced and the passage length of the layer of the ion exchanger 5 is shortened, so that the fuel passes through the layer of the ion exchanger 5. Pressure loss when passing is reduced.

  Moreover, since the filling case 4 is formed in a flat annular shape and is stacked and disposed along the top-and-bottom direction, the filter case 1 can be prevented from being enlarged in the radial direction.

  In the above embodiment, the fuel flows into the filter case 1 from above the filter case 1 and flows out from below the filter case 1. However, as in the modification shown in FIG. 3 may be arranged on the upper end surface side of the filter case 1 so that the fuel flows into the filter case 1 from above the filter case 1 and flows out from above the filter case 1.

1 Filter case 4 Filling case 5 Ion exchanger

Claims (1)

In the fuel filter that adsorbs metal ions in the fuel flowing through the filter case (1) by the ion exchanger (5),
A plurality of filling cases (4) filled with the ion exchanger (5) and through which fuel flows, the plurality of filling cases (4) being fuel filters arranged in parallel to the fuel flow ;
The plurality of filling cases (4) are each formed in a flat annular shape, and are stacked and arranged with a predetermined gap along the top-and-bottom direction,
In each of the plurality of filling cases (4), the fuel flows into the filling case (4) from the inner periphery of the filling case (4), and the layer of the ion exchanger (5) is directed in the vertical direction. A fuel filter which passes through and flows out of the filling case (4) through a plurality of through holes (41) located at the bottom of the filling case (4) .

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