Fluid sprinkling – spraying – and diffusing – Including supply holder for material – Fluid pressure discharge means
Reexamination Certificate
2000-08-18
2002-03-19
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including supply holder for material
Fluid pressure discharge means
C239S569000, C239S309000
Reexamination Certificate
active
06357674
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cleaning device for cleaning off carbon, dust, and other dirt deposited on the inner wall of an intake pipe passage or intake tappets of an engine of an automobile etc.
2. Description of the Related Art
In general, an engine of an automobile etc., as shown schematically in
FIG. 7
, is comprised of a cylinder block A
1
at the bottom of which is formed a crankcase A
2
in which is provided a crankshaft A
3
. The crankshaft A
2
is linked to a piston A
6
provided to be able to move freely up and down in a cylinder chamber A
5
.
At the top of the cylinder block A
1
is attached a cylinder head A
10
provided with an intake tappet A
7
, exhaust tappet A
8
B and spark plug A
9
.
The cylinder head A
10
Is connected to one end of an intake pipe passage A
11
. At the other end of the intake pipe passage A
11
is attached an air cleaner A
12
. In the middle of the intake pipe passage A
11
are further arranged a throttle valve A
13
, venturi of a carburetor A
14
, choke valve A
15
, etc.
A float chamber A
16
of the carburetor A
14
is designed to be fed with gasoline from a fuel tank A
17
through a fuel line A
18
by a fuel pump A
19
.
The float chamber A
16
has arranged in it a not shown float valve. The float valve automatically adjusts the amount of the gasoline fed from the fuel line A
18
to the float chamber A
16
so that the level of the gasoline in the float chamber A
16
is maintained constant at all times.
Note that excess gasoline fed into the float chamber A
16
by the fuel pump A
19
is returned to the fuel tank A
17
by a return line A
20
.
Further, the cylinder head A
10
has connected to it one end of an exhaust pipe passage A
21
. In the middle of the exhaust pipe passage A
21
is provided a catalytic converter A
22
for breaking down the NOx etc. in the exhaust gas. At the other end is attached an exhaust muffler A
23
for muffling the sound of the exhaust.
In an engine configured as explained above, in the process of the exhaust tappet A
8
closing, the intake tappet A
7
opening, and the piston A
6
descending, outside air flows through the intake pipe passage A
11
through the air cleaner A
12
and passes through the venturi of the carburetor A
14
. The increase in flow rate at this time causes a negative pressure by which the gasoline in the float chamber A
16
is sucked out and sprayed into the intake air passage A
11
as a mist.
The resultant air-fuel mixture of the gasoline and air flows into the cylinder A
5
by the further descent of the piston A
6
.
Next, when the piston A
6
rises in a state with both of the intake tappet A
7
and the exhaust tappet A
8
closed, the air-fuel mixture in the cylinder chamber A
5
is compressed. When the piston A
6
reaches close to top dead center, the spark plug A
9
is charged and the air-fuel mixture in the combustion chamber A
5
is ignited.
The explosive combustion of the air-fuel mixture causes the pressure in the combustion chamber A
5
to sharply rise. As a result, the piston A
6
is pushed down and a rotational force is caused at the crankshaft A
3
through a connecting rod A
4
.
Next, the piston A
6
again rises. In the process, when the exhaust tappet A
8
is opened, the combustion gas in the combustion chamber A
5
is exhausted from the exhaust pipe passage A
21
to the outside of the engine.
If the engine is used for a long time in this way, carbon, dust, etc. deposit and accumulate inside the intake pipe passage A
11
and at the intake tappet A
7
and become a cause impairing the smooth operation of the throttle valve A
13
or intake tappet A
7
etc. and reducing the intake efficiency.
Therefore, in the past, as shown in
FIG. 8
, the fuel line A
18
has been directly connected to the return line A
20
connecting to the fuel tank A
17
without connecting the fuel line A
18
to the float chamber A
16
and a feed line A
25
and return line A
26
of a separately prepared cleaning device
24
have been connected to the float chamber A
16
for cleaning operation of the intake pipe passage A
11
.
The cleaning device A
24
is provided with a tank A
2
in which a mixture of a washer and gasoline is stored, a pump A
28
for pumping the mixture in the tank A
27
into the float chamber A
16
, a throttle valve A
29
for adjusting the flow rate of the mixture, a manometer A
30
for displaying the pressure of the mixture in the feed line A
25
, etc. and supplies the mixture in the tank into the float chamber A
16
by the pump A
28
.
When the engine is run with the cleaning device A
24
attached to the float chamber A
16
, the float chamber A
16
is supplied with the mixture of the washer and gasoline instead of gasoline and the mixture sprayed as a mist from the venturi of the carburetor A
14
to the intake pipe passage A
11
.
While the mist or gasified mixture passes through the inside of the intake pipe passage A
11
or intake tappet A
7
, the washer contained in the mixture removes the carbon, dust, and other dirt deposited on the inside wall of the intake pipe passage A
11
or intake tappet A
7
and flushes it into the cylinder chamber A
5
.
There, the gas of the mixture and the carbon, dust, etc. entrained in it are burned by the ignition of the spark plug The combustion gas is exhausted from the exhaust tappet through the exhaust pipe passage to the outside as exhaust gas.
As another method of cleaning an intake system of an automobile engine, for example, as disclosed in Japanese Unexamined Patent Publication (Kokai) No. 10-61456, there is known the method of cleaning an intake system by using a special nozzle to inject and spray a washer inside the throttle chamber of an automobile engine equipped with an electronically controlled fuel injection system.
In a first aspect of the method of cleaning disclosed in Japanese Unexamined Patent Publication (Kokai) No. 10-61456, a blowby hose connected to the connection line of the air duct is detached and instead a special nozzle is set through a plug comprised of silicone rubber etc. connected to a tube leading to a washer container. The washer is injected and sprayed into the throttle chamber from an injection port of the nozzle.
In a second aspect of the method of cleaning disclosed in Japanese Unexamined Patent Publication (Kokai) No. 10-61456, the top lid of an air cleaner of an engine provided with a throttle chamber with a built-in air flow meter directly below the air cleaner is detached and a special nozzle used to inject and spray a washer inside the throttle chamber from a position past the air flow meter through a mesh at the top of the air flow meter.
In both the method of the first and second aspects explained above, the washer is injected and sprayed into the throttle chamber while running the engine. The engine is continued to run idle after spraying until there is no longer any smoke, that is, the washer remaining in the engine has been all burned, and the cleaning operation then ended.
Summarizing the problems to be solved by the present invention, in the cleaning device A
24
of the related art shown in
FIG. 8
, since the work of cleaning the intake pipe passage A
11
included the step of detaching the gas line A
18
and return line A
20
connecting the float chamber A
16
of the carburetor A
14
and the fuel tank A
17
and connecting the fuel line A
25
and return line A
26
of the cleaning device A
24
to the float chamber A
16
, special facilities for the cleaning work and specialized skills were required. General users therefore could not do the cleaning work by themselves.
On the other hand, with the cleaning methods disclosed in Japanese Unexamined Patent Publication (Kokai) No. 10-61456, an aerosol can was used for the washer container. With diesel engines or the recent high compression ratio gasoline engines, however, there was the danger of the propane propellant filled inside the aerosol can for spraying the washer spontaneously igniting and exploding when the temperature inside the cylinder chamber rose in the process of the compression stroke of the p
Browdy and Neimark PLLC
Hwu Davis
Nakashima Hiromasa
Scherbel David A.
LandOfFree
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