JPH0346809Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to liquid filters, particularly oil filters and fuel filters for automobiles, and is used in the field of manufacturing automobile accessory parts. .

(Prior Art) Oil filters for automobiles and other liquid filters have a structure in which a bracket 33 is fixed via screws 34 to the upper part of a cylindrical casing 32 in which a filter element 31 is housed, as shown in FIG. ing. In addition to the cartridge type shown in FIG. 5, the center bolt type (see FIG. 4) also has the screw located on the clean side, that is, on the downstream side of the filter element.

(Problems to be Solved by Invention) In the conventional liquid filter described above, if foreign matter is mixed into the liquid after passing through the filter element 31, it is not possible to remove it.

Therefore, if foreign matter enters the clean side 35 when replacing the cartridge or filter element, or if metal powder is generated from the threaded part of the screw, the liquid such as oil or fuel filtered by the filter element Since foreign matter gets mixed in and is discharged from the filter as is, there is a risk that it may adversely affect various sliding parts or block narrow fuel passages such as the injection nozzle.

(Means for Solving the Problems) The liquid filter of this invention is a liquid filter in which a filter bracket 3 is attached to the mouth of a cylindrical casing 2 in which a filter element 1 is housed. 4 has an auxiliary filter 5 attached thereto.

The shape of the material of the auxiliary filter is not limited to those shown in the following examples, and any known filter medium such as filter paper or porous ceramic may be used as appropriate.

(Function of the device) In this device, the liquid filtered by the filter element 1 is filtered again by the auxiliary filter 5 and then discharged. Therefore, foreign matter mixed into the liquid after being filtered by the filter element 1 is removed by the auxiliary filter 5, and the amount of foreign matter in the discharged liquid is reduced as much as possible.

That is, by installing the auxiliary filter 5, the above-mentioned conventional problems are solved.

Examples of this invention will be described below with reference to the drawings.

(Embodiment 1) A filter cartridge 7 is constructed by fixing a top plate 6 to the mouth of a bottomed cylindrical casing 2 in which a filter element 1 is housed. A mounting hole 9 into which the mounting portion 8 of the filter bracket 3 is screwed is provided in the center of the top plate 6, and an inlet hole 10 is provided around the mounting hole 9, and an inflow hole 10 is provided at the inner edge of the mounting hole 9. A mounting screw 8a of the filter bracket 3 is screwed into the threaded groove.

The filter bracket 3 is provided with a mounting part having a clean side passage 4 in the center thereof,
An outer peripheral wall 18 is integrally formed on the outside thereof with an annular chamber 17 interposed therebetween. The annular chamber 17 has an inlet pipe 19
A communication port 20 provided in the upper wall
Open to atmosphere. Normally, the communication port 20 is closed by a plug 21. The clean side passage 4 of the attachment part 8 communicates with the outlet pipe 22.

A discharge pipe 11 is screwed onto the upper part (downstream side) of the clean side passage 4 of the filter bracket 3, and an auxiliary filter 5 is mounted within the discharge pipe 11. An example of the structure of the auxiliary filter 5 is shown in FIGS. 2 and 3.

In the example shown in FIG. 2, the auxiliary filter 5 is made of a bag-like net (made of metal or synthetic resin), and a ring 5a at the mouth edge of the auxiliary filter 5 is caulked inside the lower end of the discharge tube 11. Further, in the example shown in FIG. 3, the auxiliary filter 5 is made of a porous sintered metal having a cylindrical shape as a whole and a conical concave portion 5b provided in the lower part. In any of the above auxiliary filters, the filtration accuracy shall be such that it does not adversely affect the injection nozzle (in the case of a fuel filter).
It may be greater than the filtration accuracy of the filter element 1.

(Embodiment 2) Next, in the embodiment shown in FIG. 4, the casing 2 and the filter bracket 3 are fixed by a center bolt 12 via a screw 23, and the structure of the auxiliary filter 5 is similar to that shown in FIG. It is similar to that shown in FIG.

In each of the embodiments described above, the liquid flows from the inlet pipe 19 as indicated by the arrow 13, flows through the annular chamber 17 as indicated by the arrow 14, and passes through the filter element 1, thereby undergoing a predetermined filtration.
Next, install the filter bracket 3 as shown by arrow 15.
The liquid rises in the clean passage 4 and is discharged from the outlet pipe 22 as shown by the arrow 16, during which time it is filtered again by the auxiliary filter 5. Therefore, metal powder etc. mixed into the liquid after passing through the filter element 1 are removed by the auxiliary filter 5.
It will be removed by

According to each of the above embodiments, the auxiliary filter 5 is installed in the removable discharge tube 11, so if the auxiliary filter 5 becomes clogged, it can be easily replaced. There is no need to provide it.

(Effects of the invention) According to this invention, since the auxiliary filter is installed in the clean side passage of the filter bracket, foreign matter that has entered the liquid after passing through the filter element can be removed. Therefore, the oil filter removes foreign objects from the oil, thereby preventing foreign objects from having an adverse effect on each sliding part, and the fuel filter removes foreign objects from the fuel, so no signs of foreign objects are caused. This has the effect of preventing clogging of narrow fuel passages such as exhaust nozzles.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the embodiment of this invention, and FIGS. 2 and 3 are enlarged cross-sectional views of the auxiliary filter.
FIG. 4 is a sectional view of another embodiment, and FIG. 5 is a sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1... Filter element, 2... Casing, 3... Filter bracket, 4... Clean side passage, 5... Auxiliary filter, 11... Discharge tube, 17... Annular chamber.

Claims (1)

[Claims for Utility Model Registration] 1. A filter element is housed inside a cylindrical casing with a bottom, a filter bracket is attached to the mouth of the casing, and the filter bracket has a clean side passage communicating with an outlet pipe in the center thereof. What is claimed is: 1. A liquid filter comprising: an annular chamber communicating with an inlet pipe on the outside of the clean side passage; and an auxiliary filter mounted within the clean side passage of the filter bracket. 2. The liquid filter according to claim 1, wherein the auxiliary filter is installed in the discharge tube of the filter bracket. 3. The liquid filter according to claim 1, wherein the auxiliary filter is a mesh or porous sintered metal.