JPS5843643Y2 - Membrane vaporizer starting device - Google Patents

Description

[Detailed description of the invention] This invention relates to a starting device for a model carburetor in which the operation of a starting pump, the operation of a fuel valve at the inlet of a fuel chamber, and the operation of a surplus fuel discharge valve are performed in conjunction with a single operation. be.

Conventionally, in a model carburetor, when starting, the fuel in the fuel tank is sent through the fuel pump to the fuel chamber where the pressure is regulated to a constant pressure, and from there the starting fuel is supplied to the carburetor bore. Some are equipped with a mechanism to discharge excess fuel when it is sent into the fuel chamber.

In a model carburetor equipped with such a surplus fuel discharge mechanism, the starting pump and the discharge valve in the discharge passage connected to the fuel chamber must be operated separately, which requires both hands and is cumbersome to operate. Also, if starting fuel is supplied without operating the exhaust valve, excess fuel may be sent into the carburetor bore, making it impossible to start.

For this reason, Japanese Patent Publication No. 46-22246, Utility Model Publication No. 47
As disclosed in Japanese Patent No. 26743, it has been proposed that a starting pump and a discharge valve are mechanically interlocked and operated simultaneously, but the starting fuel is sent to the fuel chamber through a common fuel passage with the regular fuel. In the model carburetor of the sending mechanism, it is necessary to open the fuel valve that opens and closes the fuel passage and push the pressure regulating diaphragm to make it easier to send the starting fuel. This requires both hands and the same method as above. I have a problem.

This proposal is aimed at a model carburetor that sends starting fuel and regular fuel to the fuel chamber through a common fuel passage, and connects the starting pump, the operating rod that pushes the diaphragm, and the discharge valve to one operating lever, and interlocks them. This allows the engine to be operated with one hand, and also ensures that starting fuel is supplied and confirmed in a timely manner.

Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a carburetor main body extending in the horizontal direction and having a bore 4 equipped with a venturi 2 and a throttle valve 3; 5 is a cover attached to the top; 6 is a 7 is a fuel pump, 7 is a diaphragm cover attached to the bottom, 8 is a starting pump having a pump chamber 11 which has a built-in spring 9 and is partitioned by a diaphragm 10, and an inlet pipe 12 connected to the fuel tank is a part (not shown). It communicates with the pump chamber 11 via a hand-held large mouth valve, and by pulling the operating shaft 13 fixedly protruding from the center of the diaphragm 10 to expand the pump chamber 11, fuel is sucked in, and by pushing the operating shaft 13, the pump chamber 11 is expanded. By contracting the pump chamber 11, fuel pushes open the cantilevered outlet valve 14 and enters the pump chamber 16 of the fuel pump 6 through the passage 15.

Pressure pulsations generated in the crankcase due to engine operation are introduced into the operating pressure chamber 17 of the fuel pump 6 in a pulsed manner, which causes the diaphragm 18 to reciprocate and the pump chamber 16
The volume of the fuel passage 20 is increased or decreased, and the regular fuel is sucked in through a cantilevered inlet valve (not shown), and then the outlet valve 19 is opened and the fuel passage 20 is
, and is configured to be sent to a fuel chamber 22 via a fuel valve 21.

The starting fuel is pressurized by the starting pump 8 and sent to the fuel pump 6.
Push into pump chamber 16! and reaches the fuel passage 20.

The valve body 23 of the fuel valve 21 is installed at the tip of a lever 25 on which a spring 24 acting in the valve closing direction is applied, and the base end of the lever 240 is in contact with the center of the diaphragm 25 forming the bottom of the fuel chamber 22. It matches.

When the fuel in the fuel chamber 22 decreases and the upward atmospheric pressure acting on the diaphragm 25 becomes greater than the downward load, the diaphragm 25 is pushed up and the valve body 23 is lowered to communicate the fuel passage 20 and the fuel chamber 22. Fuel regulated to a constant pressure in the fuel chamber 22 is sent to a main nozzle 27 or a slow boat (not shown) through a main jet 26 and supplied to the bore 4.

The operating lever □-28 is attached to the support shaft 2 on the diaphragm cover 7.
an operating rod 30 that is rotatably mounted by 9 and contacts the center of the diaphragm 25 for regulating the pressure of the fuel chamber 22;
The operating shaft 13 is connected to the operating shaft 13 to operate the starter pump 8 and the fuel valve 21 in conjunction with each other.

A discharge passage 31 provided at a location lower than the outlet end of the main nozzle 26 opens in the fuel chamber 22 , and a valve body 33 of a discharge valve 32 inserted into the discharge passage 31 is connected to the operating lever 28 .

Therefore, when the operating lever 28 is rotated clockwise about the support shaft 29 from the illustrated state, the starting pump 8 and the fuel valve 2
1 is activated, the valve element 33 of the exhaust valve 32 is moved to the right in the figure to open the exhaust passage 31, and by maintaining the operating state for a while, excess fuel is overflowed and exhausted.

It goes without saying that the present invention is also applied to a carburetor in which the fuel pump 6 and the fuel chamber 22 are arranged on both sides of the bore 4, and design changes such as replacing the starter pump 8 with a piston type are also possible. Of course, this is possible.

As described above, the present invention combines a starting pump that supplies starting fuel, an operating rod that pushes the pressure regulating diaphragm that controls the fuel valve, and a discharge valve that discharges excess fuel from the fuel chamber into one operating lever. Therefore, when the starting pump is operated to supply starting fuel to the bore through the fuel chamber to start the engine, the fuel valve opens and the starting fuel can be easily fed into the fuel chamber, and at the same time, it is simultaneously discharged. Even if more fuel than necessary is sent into the fuel chamber because the valve is opened, it is discharged instead of being directly supplied to the bore.

That is, according to the present invention, the starting pump, operating rod, and discharge valve can be operated with a single operation of one hand moving the operating lever, which makes handling simple and ensures that starting fuel is supplied and confirmed in a timely manner. Not only is this possible, but it also eliminates the need for the starter pump to have the function of supplying only a certain amount, making it possible to use a pump with any structure, and even if the starter pump is accidentally activated more than the required number of times, Since the exhaust valve is opened in conjunction with the exhaust valve, the engine can be started reliably and has excellent effects.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Carburetor body, 4... Bore, 6... Fuel pump, 8... Starting pump, 21... Fuel valve, 22...
-Fuel chamber, 28...operation lever 31...discharge passage, 32...discharge valve.

Claims (1)

[Scope of utility model registration request] A fuel chamber 22 that adjusts the fuel supplied to the bore 4 to a constant pressure
A fuel passage 20 common to regular fuel and starting fuel and a discharge passage 31 for surplus fuel are connected to the fuel valve 21.31, which opens and closes these passages 20.31, respectively. Discharge valve 32
In a model carburetor equipped with a starting pop 8 and a diaphragm 25 facing the fuel chamber 22, an operating rod 30 that opens the fuel valve 21 and the discharge valve 32 are connected to one operating lever 28. starting device.