A fuel pump assembly oil return structure

Abstract

The present invention relates to a novel fuel pump assembly oil return structure, including a novel fuel pump assembly oil return structure, including an oil storage barrel, an oil pump fixing seat, an O-ring, an ejection plastic seat, a plugging piece and an ejection plug, the plugging piece and the ejection plug are fixed on the ejection plastic seat, the ejection plastic seat is fixed on the oil storage barrel, the ejection plastic seat and the oil storage barrel are detachable structures, the oil pump fixing seat is fixedly connected to the ejection plastic seat and is sealed by an O-ring, the oil pump fixing seat, the ejection plastic seat and the O-ring seal are detachably connected, the structural design of the scheme is reasonable, and at the same time the difficulty of the plastic molding process is reduced, the assembly is convenient, and the applicability is strong.

Description

Technical Field

[0001] The invention relates to a fuel pump, in particular to an oil return structure of a fuel pump assembly. Background Art

[0002] The automotive fuel pump assembly is one of the basic components of the automotive fuel injection system. The existing fuel pump assembly is composed of an oil storage barrel cover, an oil storage barrel, an oil outlet check valve assembly, an oil pump fixing seat assembly, an oil pump, an inner filter, an outer filter, a return oil plastic seat, a pressure regulating valve and an ejector assembly. Its function is to pump the fuel out of the fuel tank, and synchronously cooperate with the fuel pressure regulating valve to establish a certain fuel pressure, and then deliver the fuel to the fuel supply pipeline after pressurization so that the engine can work normally.

[0003] Due to the complex design of the oil return structure of the existing fuel pump assembly, the low versatility of the product, the time-consuming and labor-intensive assembly process, which involves many ultrasonic processes. The above-mentioned ultrasonic processes have extremely high requirements on the welding electrical equipment, detection tooling, welding tooling, and personnel debugging technical level and experience. Each ultrasonic process requires experienced workers to debug repeatedly. Since the product assembly components involve many ultrasonic processes and cannot be repaired and disassembled at the later stage, it also increases the direct scrap rate of the product.

[0004] In view of the above problems, the present invention makes improvements. Summary of the invention

[0005] The present invention proposes a fuel pump assembly oil return structure, which solves the problems of complex design of the existing fuel pump assembly oil return structure, low product versatility, assembly process defects, various problems occurring during the working process, and inability to repair and disassemble, etc. by combining practical problems.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A fuel pump assembly oil return structure includes an oil storage barrel, an oil pump fixing seat, an O-ring, an ejector plastic seat, a sealing piece and an ejector plug, wherein the sealing piece and the ejector plug are fixed to the ejector plastic seat, and the ejector plastic seat is fixed to the oil storage barrel. The invention is characterized in that the ejector plastic seat and the oil storage barrel are detachable structures, the oil pump fixing seat is fixedly connected to the ejector plastic seat and sealed by an O-ring, and the oil pump fixing seat, the ejector plastic seat and the O-ring seal are detachably connected.

[0008] Preferably, the sealing member, the ejection plug and the ejection plastic seat are non-detachable structures.

[0009] Preferably, a guide limit groove structure is provided at the bottom of the oil storage barrel, and the ejector plastic seat is provided with a matching block, and the guide limit groove and the matching block of the ejector plastic seat are in interference fit.

[0010] Preferably, a hook structure is provided at the bottom of the oil storage barrel, the hook structure is composed of two inverted claws, and the ejector plastic seat is provided with two flanges, and the two flanges of the ejector plastic seat are hooked by the hook structure.

[0011] Preferably, a positioning groove structure is provided at the bottom of the oil storage barrel, and a mounting column is installed at the bottom of the ejector plastic seat, and the positioning groove and the mounting column of the ejector plastic seat are in interference fit.

[0012] Preferably, the oil storage barrel is provided with a positioning diaphragm installation groove, and a convex circle is provided on the periphery of the positioning diaphragm installation groove.

[0013] Preferably, the height of the convex circle is 0.2-1 mm.

[0014] This scheme has the following beneficial effects. It adopts a split-type injection plug structure as the oil return injection nozzle, which can reasonably divert and reduce the flow of the oil outlet pipeline. The pressure and flow are controlled according to different nozzle diameters so that the injection return oil volume meets the use requirements. The structural design is reasonable, and at the same time it reduces the difficulty of the plastic molding process, is easy to assemble, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 This is a schematic diagram of the bottom structure of the oil storage barrel;

[0017] Figure 2 for Figure 1 The cross-sectional view structure in the AA direction;

[0018] Figure 3 It is a structural schematic diagram of the ejector plastic seat;

[0019] Figure 4 Schematic diagram of the matching structure between the ejector plastic seat and the oil storage barrel Figure 1 ;

[0020] Figure 5 Schematic diagram of the matching structure between the ejector plastic seat and the oil storage barrel Figure 2 . DETAILED DESCRIPTION

[0021] The following will be combined with the attached embodiment of the present invention Figure 1-4, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0022] like Figures 1 to 4 As shown, the present invention discloses that the oil return structure includes an oil storage barrel 1, an oil pump fixing seat 2, an O-ring 3, an ejection plastic seat 4, a plugging piece (steel ball 5), and an ejection plug 6. The steel ball 5 and the ejection plug 6 are fixed on the ejection plastic seat, and the steel ball 5 and the ejection plug 6 and the ejection plastic seat 4 are non-detachable structures. The ejection plastic seat 4 is fixed on the oil storage barrel 1, and the ejection plastic seat 4 and the oil storage barrel 1 are detachable structures. The oil pump fixing seat 2 and the ejection plastic seat 4 are fixedly connected and sealed with an O-ring 3 in the middle. The oil pump fixing seat 2, the ejection plastic seat 4, and the O-ring 3 are sealed as a detachable structure. The oil return structure of the fuel pump assembly of the present invention has the characteristics of reasonable structural design, strong applicability, stable and reliable use, convenient disassembly and easy maintenance by eliminating the ultrasonic process at key positions.

[0023] The above scheme is preferred. In order to allow the ejector plastic seat 4 to check the assembly direction in advance, a guide limit groove structure 1.1 is provided at the bottom of the oil storage barrel. The interference fit between the guide limit groove 1.1 and the matching block 4.1 structure of the ejector plastic seat can not only prevent left and right shaking, but also enhance the strength of the oil storage barrel and make it less likely to break.

[0024] Preferably, in order to prevent the ejector plastic seat 4 from falling off during the disassembly and assembly process, two hook structures 1.2 are provided at the bottom of the oil storage barrel. The hook structure is composed of two inverted claws, through which the two flanges 4.2 of the ejector plastic seat are hooked.

[0025] Preferably, in order to allow the ejector plastic seat 4 to be firmly mounted on the oil storage barrel 1, two positioning groove structures 1.3 are provided at the bottom of the oil storage barrel, and the two positioning grooves are in interference fit with the mounting column 4.3 structure of the ejector plastic seat.

[0026] The above three preferred structures have replaced the ultrasonic process. Although the cumbersome ultrasonic process steps have been eliminated, the performance strength of the oil storage barrel itself has been greatly enhanced. The simple installation structure and anti-misinstallation structure allow workers to quickly install, disassemble and repair, greatly improving the production assembly efficiency and product qualification rate.

[0027] Preferably, the structure of the existing diaphragm installed on the oil storage barrel is unreasonable, because the diaphragm itself has no positioning structure and no anti-pressure protection structure 4. The diaphragm is very easy to be riveted during installation of the ejector plastic seat, and the oil storage barrel may not store oil or have a slow oil return speed. At the same time, it requires extremely high assembly experience for workers, which increases the difficulty of maintenance and disassembly. According to the above-described problems, a positioning diaphragm installation groove 1.4 structure is provided at the bottom of the oil storage barrel. The positioning diaphragm installation groove structure can not only accurately locate the diaphragm installation position, but also limit the working height of the diaphragm and protect the diaphragm from pressure. At the same time, the structure is increased with a 0.5mm high convex 1.5 reinforcing rib to prevent oil leakage from the oil storage barrel. The convex refers to the part that is higher than the bottom of the oil storage barrel, which can be set in the positioning diaphragm installation groove 1.4, and then matched with a diaphragm 7 with an anti-drop cap head can avoid the various problems mentioned above. The positioning diaphragm installation groove structure is convenient for workers to install and disassemble, and has stable practical performance.

[0028] As a preferred method, a steel ball with a diameter of 5 mm is used for pipeline sealing, which has a reasonable and compact structure and is easy to produce.

[0029] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuel pump assembly oil return structure, comprising an oil storage barrel, an oil pump fixing seat, an O-ring, an ejection plastic seat, a plugging piece and an ejection plug, wherein the plugging piece and the ejection plug are fixed on the ejection plastic seat, and the ejection plastic seat is fixed on the oil storage barrel, characterized in that: The ejector plastic seat and the oil storage barrel are detachable structures, the oil pump fixing seat is fixedly connected to the ejector plastic seat and sealed by an O-ring, the oil pump fixing seat, the ejector plastic seat, and the O-ring seal are detachable structure connections, the sealing piece and the ejector plug are non-detachable structures with the ejector plastic seat, a positioning groove structure is provided at the bottom of the oil storage barrel, and a mounting column is installed at the bottom of the ejector plastic seat, and the positioning groove and the mounting column of the ejector plastic seat are in interference fit.

2. The fuel pump assembly oil return structure according to claim 1, characterized in that: A guide limit groove structure is arranged at the bottom of the oil storage barrel, and a matching block is arranged on the ejector plastic seat. The guide limit groove and the matching block of the ejector plastic seat are in interference fit.

3. The fuel pump assembly oil return structure according to claim 1 or 2, characterized in that: A hook structure is provided at the bottom of the oil storage barrel. The hook structure is composed of two inverted claws. The ejector plastic seat is provided with two flanges, and the two flanges of the ejector plastic seat are hooked by the hook structure.

4. The fuel pump assembly oil return structure according to claim 3, characterized in that: The oil storage barrel is provided with a positioning diaphragm installation groove, and a convex circle is provided on the periphery of the positioning diaphragm installation groove.

5. The fuel pump assembly oil return structure according to claim 4, characterized in that: The height of the convex circle is 0.5 mm.

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