Detachable built-in filter for pressure accumulation type electronic control fuel injector

Abstract

The utility model provides a detachable built-in filter for a pressure accumulation type electronic control oil injector, which comprises a filter element seat, a thin shell type filter screen type filter element, a filter element seat fixing rod and an adjusting cushion block, the thin shell type filter screen type filter element is arranged on the filter element seat in an interference fit mode, the filter element seat is arranged at the bottom of a pressure accumulation cavity, and the adjusting cushion block is arranged on the filter element seat. The filter element seat fixing rod is a hollow flexible rod, the two ends of the filter element seat fixing rod abut against the filter element seat and the top of the pressure storage cavity respectively, the filter element seat is fixed through flexible deformation of the filter element seat fixing rod, and the deformation amount of the flexible rod can be controlled by adjusting the height of the cushion block. According to the utility model, the thin-shell filter screen type filter element is adopted, the aperture of the filter screen does not exceed 100 microns, the filter element can be disassembled and assembled by using a special tool, the disassembly and assembly are convenient, the cost is lower, and the filtering effect is good; the filter element is installed on the filter element base, the filter element base is simple in structure, easy to machine and capable of being used repeatedly, and the filter element base is fixed through the flexible rod and convenient to disassemble, assemble and replace.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronically controlled fuel injectors, in particular to a detachable built-in filter for a pressure accumulator electronically controlled fuel injector. Background Art

[0002] The high-pressure common rail fuel injection system is the heart of a diesel engine. As one of the most critical components of the common rail system, the electronic fuel injector's injection performance directly impacts the engine's combustion. Electronic fuel injectors are precision components that integrate electromechanical, electrical, and hydraulic systems. Large particles in diesel fuel can cause problems such as the injector's precision components to seize and the nozzle orifice to clog. Therefore, most electronic fuel injectors currently have a fuel filter installed on their high-pressure fuel inlet pipes to ensure the cleanliness of the fuel entering the injector.

[0003] Currently available patents mostly use a slit-type filter element or filter mesh structure, placing the fuel filter at the high-pressure oil inlet pipe. The processing is relatively complicated, the filter element is difficult to disassemble and assemble, and it is not convenient to replace, so the cost is relatively high. Utility Model Content

[0004] In response to the problems existing in the prior art, the present application proposes a detachable built-in filter for a pressure-accumulating electronically controlled fuel injector, comprising a filter element seat, a thin-shell filter mesh filter element, a filter element seat fixing rod, and an adjustment pad. The thin-shell filter mesh filter element is installed on the filter element seat by interference fit, and the filter element seat is installed at the bottom of the pressure-accumulating chamber. The filter element seat fixing rod is a hollow flexible rod, with its two ends respectively resting on the filter element seat and the top of the pressure-accumulating chamber. The filter element seat is fixed by the flexible deformation of the filter element seat fixing rod, and the deformation of the flexible rod can be controlled by adjusting the height of the pad.

[0005] Furthermore, a fixing rod positioning groove is provided on the upper portion of the filter element seat, and the fixing rod positioning groove is used for positioning and installing the fixing rod and the adjusting gasket.

[0006] Furthermore, a plurality of through holes penetrating along the axial direction of the filter element seat are formed on the bottom surface of the fixing rod positioning groove.

[0007] Furthermore, the plurality of through holes are symmetrically arranged relative to the central axis of the filter element seat.

[0008] Furthermore, a small hole is punched on the filter element seat fixing rod for fuel circulation.

[0009] The detachable built-in filter for the pressure accumulator electronically controlled fuel injector provided by the utility model has the following advantages over the prior art:

[0010] The utility model adopts a thin-shell filter screen filter element with a filter screen aperture of no more than 100μm. The filter element can be disassembled and assembled using special tooling, which is convenient and low-cost, and has a good filtering effect. The filter element is installed on a filter element seat. The filter element seat has a simple structure, is easy to process, and can be reused. The filter element seat is fixed with a flexible rod, which is convenient for disassembly and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram I (top view) of the present invention;

[0012] Figure 2 This is a structural diagram II (sectional view) of the present utility model;

[0013] Figure 3 This is a schematic diagram of the installation of the present utility model.

[0014] Serial number and name of the attached drawings: 1. Filter element seat, 2. Fixing rod positioning groove, 3. Hole, 4. Filter element seat fixing rod, 5. Adjustment pad, 6. Filter mesh hole distribution section, 7. Thin-shell filter mesh filter element, 8. Pressure storage chamber outlet, 9. Pressure storage chamber inlet. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0016] like Figure 1-3 As shown, the present application proposes a detachable built-in filter for a pressure accumulator electronically controlled fuel injector, which is composed of a filter element seat 1, a thin shell filter screen filter element 7, a filter element seat fixing rod 4, and an adjustment pad 5;

[0017] There are three holes 3 on the filter element seat for installing the filter element (the number of filter elements can be adjusted according to actual needs). The upper part of the filter element seat is a fixing rod positioning groove 2 for positioning and installing the fixing rod and the adjustment gasket;

[0018] 7 is the interference fit section between the filter element and the filter element seat, 6 is the filter mesh hole distribution section, the pore size does not exceed 100μm; the filter element seat fixing rod 4 is a hollow flexible tube with small holes on it for fuel flow.

[0019] During installation, first press the thin-shell filter mesh filter element 7 onto the filter element seat 1, adjust the thickness of the gasket 5 to make the flexible deformation of the filter element seat fixing rod 4 moderate, and finally install the entire filter into the pressure accumulation chamber; when the filter element 7 needs to be replaced, just take out the entire filter assembly, use special tooling to take out the filter element 7 and replace it, and then reinstall it.

[0020] The fuel flows into the pressure accumulator chamber from the pressure accumulator chamber inlet 9, flows through the filter element 7, flows into the pressure accumulator chamber through the small hole of the filter element seat fixing rod 4, and finally flows out from the pressure accumulator chamber outlet 8 through the gap between the filter element seat 1 and the pressure accumulator chamber wall.

[0021] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent changes and modifications made within the scope of the present invention and the contents of the specification are within the scope covered by the present invention.

Claims

1. A detachable built-in filter for a pressure accumulator electronically controlled fuel injector, comprising a filter element seat, a thin-shell filter screen filter element, a filter element seat fixing rod, and an adjustment pad, characterized in that: The thin-shell filter screen filter element is installed on the filter element seat by interference fit. The filter element seat is installed at the bottom of the pressure accumulation chamber. The filter element seat fixing rod is a hollow flexible rod, with both ends respectively resting on the filter element seat and the top of the pressure accumulation chamber. The filter element seat is fixed by the flexible deformation of the filter element seat fixing rod. The deformation of the flexible rod can be controlled by adjusting the height of the pad.

2. The filter according to claim 1, characterized in that: A fixing rod positioning groove is provided on the upper portion of the filter element seat, and the fixing rod positioning groove is used for positioning and installing the fixing rod and the adjusting gasket.

3. The filter according to claim 2, characterized in that: The bottom surface of the fixing rod positioning groove is provided with a plurality of through holes penetrating along the axial direction of the filter element seat.

4. The filter according to claim 3, characterized in that: The plurality of through holes are symmetrically arranged relative to the central axis of the filter element seat.

5. The filter according to claim 1, characterized in that: The filter element seat fixing rod is provided with a small hole for fuel circulation.

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