JPS59153965A - Fuel feed device of carburetor - Google Patents

Abstract

PURPOSE:To prevent the intake of air from a nozzle port and facilitate the starting by providing a check valve opened by a pressure higher than the opening pressure of the exhaust check valve of a fuel tank in a fuel feed passage and providing a check valve in an overflow passage. CONSTITUTION:When the outside temperature is high and the pressure in a fuel tank 3 is increased, an exhaust check valve 93 is opened, then the pressure is discharged into the atmosphere and is not increased. The opening pressure of a feed check valve 65 is set at this remaining pressure or higher, therefore when a tickler 33 is operated a fuel chamber 9 is not pressurized, and the fuel is never blown out through a nozzle port 41. When the pressure is reduced due to a decrease of the outside temperature, the atmospheric air is sucked through an intake check valve 95, thereby when the tackler 33 is operated the air is never sucked through the nozzle 41. Accordingly, the starting of an engine is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a ventilation passage connecting a fuel tank and a fuel tank;
From the fuel tank to the carburetor fuel I1. W '\fuel1'≧1
The fuel 1 of the carburetor is equipped with a fuel supply passage for supplying
';l (This is related to 1% supply and purchase.

Conventionally, when starting a engine, if there is insufficient fuel in the combustion chamber +1 of the carburetor, the fuel supply passage [, -52
The fuel η°;1 in the fuel tank 1'31 is pumped into the fuel chamber 1111 using the manual pump that was installed, and the fuel chamber is filled with fuel 1. tank(
) It was set up so that it would run smoothly. 1. When it is necessary to increase the amount of fuel 1i at the time of operation or startup, operate the tickler, which swings the aphram installed at the bottom of the fuel chamber.
Nozzle I'j /)11 Increase the ejected fuel by 11+1
11 L, there was.

The tickler at the mouth is configured to open and close in conjunction with the on-off valve installed in the fuel chamber entry [eye installation] Iζ control valve (Part 1:1) passage. When you move A'1, you can hear this on-off valve and control valve.
- (The internal pressure of a fuel tank increases depending on the outside temperature, but how much does one fuel tank cost?) Push the I) l see-through valve installed in the ventilation passage on the upper jaw. Although the fuel is released into the atmosphere, there is still a residual internal pressure in the fuel tank corresponding to the opening of the valve 1-L. When the tickler is activated, the residual pressure pressurizes the fuel chamber, and the fuel is injected from the nozzle [1] and excessively sucked into the engine, causing the engine to start. In addition, the fuel in the fuel tank is consumed and the pressure inside the fuel tank decreases as the outside temperature decreases. However, during this time, negative pressure equivalent to the valve pressure remains in the fuel tank.
Then, make the combustion air through the A-bar flow passage a negative pressure, and pump the air from the nozzle (-1 to 117'J, bow 131. [From 1
! 1 is difficult to start the ejecting engine.

The present invention provides a supply reversal valve that opens at a pressure higher than the valve pressure between the L valve (1) of the fuel oil '+1 tank in the fuel supply passage 181, or furthermore, 7 In the two-bar flow passage, the intake check valve in the fuel tank opens at Lf force lower than the opening pressure of the valve ↑. De nozzle [1
It prevents excessive fuel from being ejected or, conversely, prevents air intake and makes it easier to start the L engine.
It is something that

Below, a detailed explanation of one practical rule of the J-kori wood carving system is given in the drawings t-J'+.

In the figure, 1 is the carburetor and 33 is the 1N fuel tank. The carburetor 1 is constructed as shown below. In the diaphragm, a combustion chamber 9 is formed in the -1-p i and an air Ir chamber 11 is formed in the lower part.
and fuel chamber 9 3!1! In the fuel supply passage, there is a dianoram bomb 17h'r;uI
The pressurized chamber 19 behind the diaphragm 1ε3 communicates with the crank tooth (one shown) of the engine, and the UVL pressure chamber 19 is connected to the engine crank tooth (one shown in the figure), and the UVL pressure chamber 19 is connected to the engine crank tooth (one shown).
C, TurrJ7 flamm 18 swings and the check valve 21. Fuel is sent through a pump chamber 23 and a check valve 25. 2
7 is an arm supporting the lower end of the control valve 15 at the end, and the shaft 2
9, the control valve 15 is closed by the ammunition 31 (=1!!A.3
3 is a tickler whose upper end is fixed to the diaphragm 5, and whose lower end is installed at the bottom of the main body 7, and 5 is a bullet that moves the tickler 33 downward (t9!3).37 is an engine. The nozzle passage 41 communicates with the air flow path 39 which communicates with the air intake 1] (not shown in the figure) and the nozzle port 41, and the nozzle passage 43 is a needle valve for adjusting the nozzle port 41. , 45 is a needle valve that adjusts the nozzle passage 37. 47 is a valve between I!lI and the fuel 1') 1
Part 49 of the cylinder with frontage at 0, part 49 of the cylinder
There is a valve body 51 which is slidable inside. Cylinder part 4
9 is Oparts [] - 534 passages (fuel tank c"l
IL-j) 1. i'l stay. 5〉5 is the A-barco pipe installed in the A-barno [1-passage 53].171 pieces 51 are the lower O test; , 1, the bomb 57 (forced downward at 1°C. 55) is a manual pump manufactured by GolX installed in the fuel supply passage 13, and the pump chamber 6
1, the lower part of which is passed through a small valve 63 to a rubber supply reverse valve 6[j] in the fuel tank 3, and to a sponge-like filter 67. 69 is 8 between the connecting pipe 70 fixed to the fuel tank 3 and the A-part low vibe 55.
(N IJ), 22 fl
Screw into 73 with screw 75.
4M growth δ is completed. 14T years old) l), 771. , one L sapling 75) with a valve cylinder installed inside the flange part 81.
is formed integrally with. A groove part 83 is provided in the flange part 31 to allow the valve cylinder 77 and threaded part 75 to pass through.
A ventilation passage 85 is configured to communicate between the fuel tank and the inside of the fuel tank through the gap in the rib portion 75. 87 is a valve element C that engages with a protrusion 89 that protrudes into the valve n77.
, an exhaust check valve 93 and an intake check valve 95'' manufactured by GolX are integrally formed.
1. 11 - Set the pressure higher than the open valve tIJ of the valve 93.
The opening pressure of check valve 9) 3 is 0,2! ((1/cm
2. The valve opening pressure of supply 'r'-Q +l 5f is 0, 31
(IJ/Cn12 (This setting is C.

Yota A-Parts [1-Reverse J1 valve 69 opening rr L, L
1. Set the pressure lower than the pressure of the reverse outlook 95.

In other words, in this example, the intake air)? ! ! The opening pressure of the stop valve 95 is -0, 02kQ/cnl, Oparts 1] - The opening BH of the check valve 69 is -0, 05k! ! /' Cln
2 ni r, -u constant 1 no'U il.

In this example, when starting the engine, tζ
GJ: When the operator presses the ticker 33 upward a little with his fingers, the diaphragm 5 will be slightly pressed down, causing the fuel in the combustion chamber 9 to enter the air flow path 39. The kC1 movement is easily defined by measuring the Aiki jfi'I degree.

At this time, the control valve t15 and the valve body 51 are set in the luer gap between the dikler 33 so as to be in a closed state. Fuel PI? When the fuel in the 9 is insufficient, press the Lycra-33 firmly and press the ΦIJ with your hand.
Pump 61G operation 1'1 control button t 15.

Opening/closing valve/17 listens, fuel 111 in tank 3
．． t, supply 3t)'i 41 valve 65, check valve 2'l, 2
! ! 3'3- Pressure, control valve 15 to combustion '11 chamber 1
] Go inside and burn ') 1 room 9 is filled;
, the surplus 41 fuel PI returns from the A-part []-path 53 into the fuel tank δ.

The outside temperature is h! :+ As the air inside the tank increases in pressure, the check valve 03
is released into the atmosphere from the ventilation passage 85. However, the pressure inside the fuel tank 3 is 131 degrees Fahrenheit (0.2 J%cm2 in this example)
) Do not dry out anything below 1-. Therefore, (supply check valve 65
The opening valve 11 is set at a pressure below this residual 0 sweat (t in this example).
el: , 0, 3 kg/cm2), the residual pressure of ('1) is blocked by the supply check valve 65.
1° ≧ Jin vote) (J, m will not be ffed, and no Jii+ will erupt from Nosururo/11. Alternatively, if the pressure decreases due to the outside temperature (T?7), air is sucked in through the intake check valve 951). Did you do it?) Temo 1! f- in 1 Kunku 3! The pressure is when the intake check valve 95 is opened 1
1 (actual frf & I!41 -('), 02
It is low to below k[+/cm2). Therefore, the opening pressure of the A-bar 70-check valve 63 is the pressure below this residual 0 sweat (in this example, -o, 03ko,
/cm2) is set to (°, this residual negative pressure is A-bar°)1]-'l'l'4.
I, +I- υ, when Tickler 33 is activated)? There is no negative pressure in the right ventricle 9), and no air is sucked through the nozzle port 4.

The present invention is as described in the claims; I'l', L[or j'n Ll: is the fuel of the vaporizer? Prevents pressurization or suction +L L/ (, nozzle l', I /Jl
This prevents the spouting of excessive fuel 131 or the suction of air from the nozzle port into the fuel chamber, making it easier to start the engine 41
It is a sign that you will know.

It should be noted that the present invention is not limited to the above embodiments, but may be implemented in other embodiments. Furthermore, the reference numerals in the claims do not limit the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is an explanatory side sectional view of one embodiment of the present invention, and FIG. 2 is an enlarged side sectional view of the main parts. 33. 1 is a perspective explanatory view of the same, FIG. 4 is an enlarged side sectional view of the main part of the sacrum 1, FIG. 5 is a perspective explanatory view of the same, and FIG. 6 is a side sectional view of the main part of FIG. 3. . (Explanation of the Lee crossbow showing the main 41 parts of the drawing) 1...
Carburetor 3... Fuel tank 9... Fuel Fl
To 13...Fuel supply passage 53...A-Bar flow passage 65...Supply reverse 1]-Butt 6...A-Bar flow reverse 11 valve E3[)...Vent passage 93. ...111 ki reverse 11. 'jt95...Intake check valve Fig. 1 Fig. 214 Fig. 4 tt! :lzu

Claims (2)

[Claims] (1) A ventilation passage 85 for communicating between the fuel tank 3 and the fuel tank 3, a fuel supply passage 13 for supplying fuel from the fuel tank 3 to the fuel 9 of the carburetor 1, etc. are provided ( J
, an IJI air reverse valve 93 communicating with the atmosphere is installed in the ventilation passage 85 (); The fuel supply device for the carburetor is characterized by a supply reverse valve 65 that opens at high pressure. (2) Ventilation passage 85 that communicates between the fuel tank 3 and the atmosphere
Supply fuel from the fuel tank 3 to the fuel chamber 9 of the carburetor 1! A fuel supply passage 13 is provided in the air passage 85, and a backflow valve 93 is provided in the air passage 85, which communicates with the airflow direction.
is provided in the fuel supply passage 13 to open the valve at a pressure higher than the opening pressure of the tJl reverse check valve.
In addition, an overflow [1-passage 53] is provided for returning fuel from the combustion chamber 9 to the fuel tank 3.
RQ Gi , an intake 9-reverse 11 valve 9[) that communicates with the fuel tank 3 direction is provided in the ventilation passage 86 , LJ is provided in the overflow passage 53 , and a valve opening pressure J of the intake check valve 95 is provided in the overflow passage 53 . Lee-L) (t1 ``Force C valve open Ruru A-Barf [1-
The reverse 11' valve 69 is characterized by a stage ('31' opening) and a fuel supply unit for the carburetor.