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Bypass one-way valve of double-fuel supply system of DME/diesel engine

A technology of supply system and one-way valve, which is applied in charging system, fuel injection pump, fuel injection device, etc., can solve the problems of insufficient fuel supply and severe pressure fluctuation, and achieve smooth fuel supply, stable pressure, and avoidance of gas. blocking effect

Inactive Publication Date: 2016-08-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a bypass check valve for DME / diesel engine dual fuel supply system. The bypass check valve can effectively solve the problem of high pressure oil caused by the "phase change" of dimethyl ether in the fuel pump cavity during the fuel supply process. The problem of severe fluctuations in the pressure of the road and the serious shortage of oil supply can overcome the gas resistance phenomenon caused by the gasification of dimethyl ether fuel in the high-pressure pump chamber

Method used

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  • Bypass one-way valve of double-fuel supply system of DME/diesel engine
  • Bypass one-way valve of double-fuel supply system of DME/diesel engine

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The DME / diesel engine dual fuel supply system bypass check valve shown in the figure is installed between the pump body 1 and the oil outlet valve 2 of the plunger type fuel injection pump. The inner cavity of the pump body 1 is provided with a plunger sleeve 3, The plunger sleeve 3 is provided with a plunger 4 that slides with it, and the side wall of the pump body 1 is provided with an oil return hole 5 penetrating through its inner wall, and the oil return hole 5 is connected to the fuel tank through the first outer pipeline 6 7, the plunger 4 is provided with a chute 19 for controlling the fuel supply; it includes an upper valve body 8, a lower valve body 9 integrally formed with the upper valve body 8, an upper valve body 8 and A valve cavity 11 for installing the one-way valve assembly 10 is provided between the lower val...

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Abstract

The invention discloses a bypass one-way valve of a double-fuel supply system of a DME / diesel engine. The bypass one-way valve comprises an upper valve body and a lower valve body, wherein the upper valve body and the lower valve body are integrally shaped, and a valve cavity allowing a one-way valve assembly to be mounted is formed between the upper valve body and the lower valve body; the top of the upper valve body is connected with an oil outlet valve through threads, and the bottom of the lower valve body is connected with a pump body through threads; the bottom end of the lower valve body, the top end of a plunger piston and the inner wall of a plunger piston sleeve surround to form a pump cavity allowing fuel oil to be stored. Through the adoption of the bypass one-way valve disclosed by the invention, the problems that the pressure of a high-pressure oil circuit fluctuates fiercely and the oil supply quantity is in serious shortage caused by phase changes of DME in the fuel oil pump cavity in the oil supply process can be effectively solved, and an air resistance phenomenon caused by aerification of DME fuel in the high-pressure pump cavity is avoided.

Description

technical field [0001] The invention relates to a check valve, in particular to a bypass check valve for a DME / diesel engine dual fuel supply system. Background technique [0002] Dimethyl ether (DME) is a new, high-efficiency and ultra-low-pollution alternative fuel that is more suitable for diesel engines. DME is gaseous at normal temperature and pressure, and its vapor saturation pressure is about 0.5MP. High and elevated. [0003] The traditional plunger fuel injection pump has the following problems when supplying DME / diesel mixed fuel: when the fuel supply process is over, the plunger runs down until the oil return hole opens, and a sealed space will be formed in the high-pressure fuel pump cavity. As the plunger continues to descend, the volume of the fuel pump chamber expands, and the pressure in the fuel pump chamber will drop rapidly. At this time, the pressure in the fuel pump chamber will be lower than the vaporization pressure of dimethyl ether in the fuel pum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/46F02M59/44F16K15/02
CPCF02M59/464F02M59/44F16K15/025
Inventor 潘志翔董健邓柯杨敬堡马红阳
Owner WUHAN UNIV OF TECH
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