JPS5872795A - Pressure pulsation removing device for fuel piping - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure pulsation eliminating device in a fuel pipe of an internal combustion engine.

As a conventional fuel pipe pressure pulsation removing device, there is one shown in FIG. 1, for example. This is called a bladder type accumulator, and a synthetic rubber bag 3 is provided in a container 2 that is connected through a connection port 1 in the middle of a fuel pipe (not shown). It is filled with gas.

A poppet valve 5 is attached to the connection port 1 and closes as the gono-bag 3 expands to protect the rubber bag 3 from protruding from the inside of the container 2.

The fuel is led to the oil chamber 6 inside the container 2, and the oil chamber 6 and the gas chamber 7 are separated by a large flexible rubber bag 3, so that, for example, the oil chamber Even when fuel is released from the fuel tank 6, the gas expands to prevent large fluctuations in fuel pressure. This eliminates the pressure pulsations that occur in the combustion pipe, and absorbs the impact force that occurs when the load suddenly changes or the valve opens and closes rapidly. (Maruzen Co., Ltd. 1962 2)
(Published on May 15th, Hydraulic Control P, 133) However, in such conventional pressure pulsation removal devices, a gas chamber made of a synthetic rubber bag is provided inside the container.
Separated from the oil chamber, the structure removes and absorbs pressure pulsations in the oil chamber through the expansion and contraction of the gas chamber, and also has a sufficient pressure accumulation effect, resulting in a large overall shape that is suitable for use as fuel in internal combustion engines such as automobiles. It is not always easy to install it in the middle of piping, and because a rubber bag filled with high-pressure gas is stored inside the pressure vessel, in the event that the gong, bag, or pressure vessel is damaged, the rubber bag should be removed. There was a problem in that the bag was extremely dangerous because it would burst explosively.゛The present invention has been made with the aim of solving these conventional problems, and it uses a variable volume member in which porous rubber such as foamed rubber or sponge-like rubber is covered in a film-like manner with an oil-resistant rubber. Use it and burn it! By placing the pipe in contact with the fuel in the middle of the pipe, pressure pulsations, etc. are eliminated.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 2 shows an embodiment of the invention.

To explain the configuration, a cylindrical case 11 has a cylindrical shape with a fuel passage hole 12 formed at its axis, and a tζ variable volume member 13.
is inserted, and fuel pipe connection ports 15 are attached to both ends of the case 11 via seal metals 14.

The variable volume member 13 is made of foamed rubber 16 as a porous rubber having a cylindrical shape and a hole in the shaft core, and its surface (including the inner surface of the hole) is covered with a sheet-shaped oil-resistant rubber 17.
This is to prevent fuel from leaking into the foamed rubber 16.

More specifically, as the foamed rubber 16, NBR alone or NBR
N is made by adding PVC to BR and foaming it with a plasticizer. It is better to use 3R foam gono 6. In this case, the NBR foam goto has closed cells, and the air core diameter is 0.3
~0.5φ. In addition, the specific gravity of NBR-made O rubber is N
It should be 1/2 to 115 that of BR rubber.

Oil-resistant rubber 17"
:<, Its thickness may be about 0.5 *v. It may also be covered by a coating.

In addition, the diameter of the variable volume member 13 in this case is the fuel hole ■2.
The diameter may be approximately four times (for example, 2011ψ) the diameter of (for example, 51φ).

Here, the fuel is connected to one fuel pipe (411 rl).
15, and flows out from the other fuel pipe connection i41TI 15 through the fuel passage hole 12 in the axis of the variable volume member I3.

Next, the action will be explained.

The foamed rubber 16 has fine air bubbles surrounded by a thin layer 112, so the gas inside the bubbles and the thin layer surrounding the bubbles! Depending on the situation, it can be made into an improvised material with flexibility.

Therefore, the variable volume member 13 made of the foamed rubber 16 covered with a bendable rubber 17 is housed in the case 11, and the fuel is allowed to flow through the fuel hole 12 in the shaft core of the variable volume member 13. Pressure pulsations and impact pressure can be removed and absorbed by the contraction and expansion of gas within the bubbles of the rubber 16.

Note that the degree of absorption can be adjusted by the degree of foaming.

In addition, by forming the fuel hole 12 in the axis of the variable volume member 13 as in this embodiment and making the variable volume member 13 a part of the fuel piping, it becomes very compact, and the fuel piping of the internal combustion engine can be made very compact. It can be easily installed on.

Other embodiments are not shown in FIG.

In this embodiment, a cylindrical foam gono, 2
6 is covered with an oil-resistant rubber 27 (a variable volume member 23 is housed therein, a space 22 is provided on the side of the single force end surface of this q variable volume member 23, and a fuel pipe connection port is provided before and after this space 220. 25 was formed.

Therefore, ζ, the fuel flows inside the space 22 through the variable volume member 23.
The flexibility of the variable volume member 23 absorbs pressure fluctuations and j◆J impact pressure! 11. Not only can it be removed, but depending on the volume of the space 22, it can also contain young fruit.

Alternatively, it is also possible to use sponge-like rubber instead of foamed rubber as the porous rubber.

As explained above, according to the present invention, a variable volume member made of porous rubber such as foam rubber or sponge-like rubber covered with oil-resistant rubber is arranged in the middle of the fuel pipe so as to be in contact with the fuel. Because of its structure, it is able to absorb pressure fluctuations and impact pressure by the contraction and expansion of gas within the porous gas bubbles, and the device structure is extremely compact, making it easy to install in the middle of the fuel piping of the eight engines. You will be able to do this. Furthermore, since high pressure gas is not used, there is no risk of explosion, and safety is extremely high.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional example of a pressure pulsation removal device;
The figure is a sectional view showing one embodiment of the present invention, and FIG. 3 is a sectional view showing another embodiment. 11.21...Case 12...Fuel hole 13.
23... Volume variable member 15.25... Fuel) I piping connection 1ftn I 6. 26... Foamed rubber (porous rubber) 17.27... J/LB rubber 22... Spatial patent applicant 1 Kosan Jidosha Co., Ltd. Agent Patent attorney Tomi Sasashima ( F(
7) Figure 1

Claims (1)

[Claims] A pressure pulsation removal device for fuel piping, in which a variable volume member, in which the surface of a porous gob is covered with a membrane of oil-resistant goth, is disposed in the middle of the fuel pipe so as to be in contact with the fuel.