Fuel pump core with diverter port on pump cover

Abstract

A fuel oil pump core with a diversion port in a pump cover comprises an end cover combination part, a stator combination part, an armature, a pump case, an impeller and the pump cover, wherein an oil inlet and an oil groove provided with an air hole are formed in the inner end surface of the pump cover. The fuel oil pump core is characterized in that a drive flow hole is formed in the outer side edge in the oil groove formed in the inner end surface of the pump cover; an included angle alpha is formed between the drive flow hole and the oil inlet; one tubular diversion port is formed in the outer end surface of the pump cover; an inner port of the tubular diversion port formed in the outer end surface of the pump cover is opposite to and communicated with the drive flow hole formed in the outer side edge in the oil groove in the inner end surface of the pump cover; and a limit groove used for fixing a drive flow use device is further formed in the tubular diversion port formed in the outer end surface of the pump cover. The fuel oil pump core with the diversion port in the pump cover is reasonable in structure, concise, easy to process, low in manufacturing cost, high in production efficiency and suitable for being applied to a fuel oil pump assembly.

Description

technical field [0001] The invention relates to a fuel pump pump core, in particular to a fuel pump pump core with a diversion port on the pump cover. Background technique [0002] At present, for fuel pump products on the market, when the fuel pump needs a driving flow to drive the auxiliary pump or ejector pump, the main stage of the pump core is generally installed with a tee to divide the flow to serve as the ejector pump or auxiliary pump. The driving flow of the pump, or the impeller designed as a double track to drive the auxiliary pump or the ejector pump. [0003] In the former, the main stage of the pump core is installed with a tee, and the flow is divided to serve as the drive flow of the ejector pump or the auxiliary pump. In this way, it is necessary to design a tee and install a hose to connect the drive flow of the pump core with the ejector pump. As a result, the number of parts increases, the cost increases, and the assembly process is cumbersome due to th...

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Problems solved by technology

[0003] In the former, the main stage of the pump core is installed with a tee, and the flow is divided to serve as the drive flow of the ejector pump or the auxiliary pump. In this way, it is necessary to design a tee and install a hose to connect the drive flow of the pump core with the ejector pump. As a result, the number of parts increases, the cost increases, and the assembly process is cumbersome due to the large number of parts. In addition, the shunt flow is drawn from the main stage of the pump core, and the pressure is very high. The pressure of the main stage of the fuel pump is generally around 4bar. The nozzle of the jet pump must be designed as an extremely small hole with a diameter of less than 0.4mm, otherwise it will affect the flow of the main stage, and the extremely small hole is difficult to process and easy to block

[0004] The latter is designed as a double-track impeller to drive the auxiliary pump or the ejector pump, so the pump casing and pump cover must be processed into a double groove form, and the impeller is two rings of blades inside and outside. However, this not only greatly increases the distance between the impeller blades and the pump casing and pump cover It is difficult to process, and it also reduces the processing efficiency, and at the same time, the cost of parts is significantly increased

[0005] All in all, the existing products are complex in structure, difficult to process, troublesome in assembly, high in manufacturing cost, and also weaken the competitiveness of the product in the market

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