JPS6132131Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vapor generation suppressing device in a vaporizer.

When the temperature is high, the temperature of the carburetor and the fuel passage leading to the carburetor rises, creating a temperature difference with the low-temperature fuel supplied from the fuel tank, and vapor is generated in the fuel in the fuel passage or float chamber. This may cause a vapor lock phenomenon that blocks the fuel passage in the carburetor. Therefore, conventionally, a return pipe is installed to return part of the fuel to the fuel tank before the fuel enters the float chamber to remove the vapor generated in the fuel passage, but the vapor generated in the float chamber is removed. There wasn't enough to do that.

In view of the above, the present invention forcibly warms the fuel to a temperature equivalent to the temperature of the float chamber before entering the float chamber, and forcibly heats the fuel that would otherwise be generated before entering the float chamber. In other words, in a vaporizer having a float chamber, the temperature of the float chamber is detected and the vapor lock phenomenon is minimized. A fuel passage comprising a temperature sensor that outputs a current proportional to temperature, and a heat source that receives the output current of the temperature sensor and generates heat in proportion to the current value, and that communicates the heat source with the fuel pump and the float chamber. and is characterized in that it is installed so as to heat the return passage to the fuel tank or the upstream part of the vapor separator.

Next, an embodiment of the present invention shown in the drawings will be described. In FIG. 1, 1 is a fuel tank, and 2 is a fuel pump, which are communicated through a fuel passage 3.
The fuel sent out from the fuel pump 2 passes through the heating section 4 of the fuel passage, the fuel passage 5, and is branched into a passage 6 to the float chamber and a return passage 7 to the fuel tank 1. . The fuel flowing from the passage 6 flows into the float chamber 10 through a passage opened by the needle seat 8 and needle pin 9. A temperature sensor 11 is provided on the outer surface of the bottom plate of the float chamber 10 to detect the temperature of the float chamber 10 and output a current proportional to the temperature. When activated, it operates with power supply 13. Reference numeral 14 denotes an electric heater that generates heat at a temperature proportional to the current value, and is designed to generate heat in response to the current from the temperature sensor 11, and is installed to heat the heating section 4 of the fuel passage. .

As described above, when the float chamber 10 is heated due to a rise in ambient temperature during engine operation with the ignition switch 12 turned on, the temperature sensor 11 detects the temperature and also detects the temperature. A current proportional to is emitted to the electric heater 14. As a result, the electric heater 14 generates heat to a temperature proportional to the current, and heats the heating section 4 to the same temperature as the float chamber 10. Therefore, when the fuel sent out from the fuel pump 2 passes through the heating section 4 of the fuel passage, it
0 or other heated fuel passages, and passes through the fuel passage 5 into the float chamber 1.
0. At this time, vapor is generated in the fuel due to heating by the heating section 4 of the fuel passage, but the vapor is returned to the fuel tank 1 through the return passage 7 provided downstream, and the fuel not containing vapor is floated. is supplied to the chamber 10. In this float chamber 10, since the supplied fuel has already been heated as described above, the generation of vapor is extremely small.

FIG. 2 shows another embodiment of the present invention, in which a vapor selector 7a is used in place of the return passage 7 of FIG. 1, and the other mechanisms are the same as those of the previous embodiment.

As described above, in the present invention, the fuel sent from the fuel pump is heated to a temperature equivalent to that of the float chamber before reaching the return passage or vapor separator, and then supplied to the float chamber. Therefore, very little vapor is generated in the float chamber, and vapor generated in the fuel heating section is discharged through the return passage or vapor separator, reducing vapor lock phenomenon and improving operating performance at high temperatures. It has the feature of being able to

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing two embodiments of the present invention. 1... Fuel tank, 2... Fuel pump, 4... Fuel passage heating section, 5... Fuel passage,
7... Return passage, 7a... Vapor separator, 10... Float chamber, 11... Temperature sensor, 14... Electric heater.

Claims (1)

[Scope of utility model registration request] In a vaporizer having a float chamber, a temperature sensor detects the temperature of the float chamber and outputs a current proportional to the temperature, and a heat source receives the output current of the temperature sensor and generates heat in proportion to the current value. In a vaporizer, the heat source is installed in a fuel passage communicating between a fuel pump and a float chamber, and so as to heat a return passage to a fuel tank or an upstream part of a vapor separator. Vapor generation suppression device.