JPS6146199Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a fuel discharge device for a carburetor used in a general-purpose internal combustion engine or the like.

FIG. 1 shows a conventional float type vaporizer. In the figure, 01 is the carburetor main body, 02 is the fuel inlet, 0
3 is needle valve, 04 is fuel chamber, 05 is float, 06
07 is the main nozzle, 07 is the air passage, 08 is the drain bolt, and 09 is the oil level. In this type of carburetor, the fuel in the carburetor is drained by hand or using a tool. That is, the water is drained by pulling out the drain bolt 08 using a wrench, and after draining is completed, the opposite operation is performed.

However, this case has the following drawbacks.

(1) The drain operation must be performed manually, and therefore, whether or not to perform the operation is at the discretion of the user, making it difficult to perform reliably and easy to forget.

(2) The degree of gasoline deterioration depends not only on the properties of gasoline but also on weather conditions such as temperature, humidity, and atmospheric pressure, so it is virtually impossible to perform draining operations that match these conditions.

(3) In order to completely avoid artificially altering the quality of gasoline in the carburetor, a drain operation must be performed every time the engine is stopped, which is troublesome and uneconomical. Gasoline deterioration in the vaporizer is defined as low-temperature volatile matter in gasoline evaporating and only high-temperature volatile matter remaining, which undergoes a chemical reaction with the constituent materials of the vaporizer due to the influence of weather conditions such as atmospheric temperature, humidity, and atmospheric pressure. This results in a gum-like texture. It is estimated that it usually takes 20 to 200 days to reach a gummy state. Please note that this occurs when the engine is stopped (gasoline stagnates) and when driving (gasoline circulates).
does not occur.

Engine troubles caused by this deterioration include the following.

1 The various jets and fuel passages in the carburetor become clogged, making it difficult to start.

2. The engine malfunctions due to the adhesion of altered substances to the various jets and fuel passages in the carburetor.

3. The altered substances fall off during operation and block various jets and fuel passages, resulting in poor operation or engine stoppage.

4. Corrosion of carburetor and fuel system parts reduces component life.

These engine troubles have always occurred sporadically, but with the shift to unleaded gasoline introduced several years ago, these troubles have become more common, especially when the frequency of engine use varies and due to suspension of work during the distribution stage. This is noticeable in small general-purpose engines that require long-term storage. To counter this problem, measures have been taken to prevent deterioration of the gasoline itself (addition of deterioration inhibitors) and to facilitate the operation of the gasoline drain in the carburetor, but no solution has been found.

The purpose of the present invention is to provide a fuel discharge device that eliminates the above-mentioned drawbacks, and its characteristics are that a hollow discharge pipe is filled with a porous member to form a suction body; One end is inserted into a receiving hole provided in the peripheral wall of the float chamber of the vaporizer to face the opening of the float chamber, and the other end is opened outward to form a capillary tube of the porous chamber member. In the device for discharging the fuel in the float chamber due to this phenomenon, a covering body made of synthetic resin that covers the periphery of the suction body outside the carburetor and is formed integrally with the suction body; The present invention is provided with a fixing device for clamping a fuel discharge device consisting of a fuel discharge device between the carburetor main body and the float chamber.

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 2 is a sectional view showing a carburetor according to an embodiment of the present invention, Fig. 3 is a sectional view taken along the - arrow in Fig. 2, Fig. 4 is a sectional view taken in the - arrow direction in Fig. 2, and Fig. 5 is a sectional view taken in the - arrow direction in Fig. 2. Second
Figure 6 is a cross-sectional view taken from the direction of the arrow in Figure 5.
It is an arrow sectional view.

In the figure, numerals 01, 04, 05, and 09 indicate the same parts as in FIG.

Reference numeral 11 denotes a suction body, which is composed of a hollow discharge pipe (metallic or non-metallic pipe) 12 and a porous member 13 filled in the pipe 12. The discharge pipe 12 bent convexly upward has its inlet side inserted into a vertical hole 16 formed in the thick wall portion 15 of the float chamber 14, and also connects the horizontal hole 17 of the thick wall portion 15 with the hole 1.
8, and the outlet side is a fuel tank (not shown)
It is connected to a flexible tube 19 that communicates with the other parts.

Note that the porous member 13 is a continuous material processed by, for example, plastic sintering molding (using fluorine resin, nylon, polyethylene, etc. as a material, shaping powder at room temperature, and then sintering and molding in a heating furnace). It is a foam that exhibits porosity and has the property of drawing up fuel through capillary action.

Reference numeral 20 denotes a covering made of plastic or the like, which covers the periphery of the suction body 11 outside the vaporizer, and
It is integrated with 1.

Reference numeral 12a denotes a flange, which is formed by bulge processing of the discharge pipe 12, and the upper end of the flange 12a and the covering body 2.
As shown in FIG. 5, the lower end of the wide width 0 has a predetermined interval.

A support member 22 is formed to protrude from the carburetor main body 01, and has a recessed portion 22a, a notch 22b, and a bent portion 22c.

23 is the main nozzle bolt, the carburetor body 01
By fastening, the flange portion 12a is clamped and fixed between the bent portion 22c and the thick portion 15 via the O-ring 24 and the washer 25.

The operation in the case of the above configuration will be described.

When the engine stops, an automatic fuel switch (not shown) installed between a fuel tank (not shown) and the fuel inlet 02 is closed, and the liquid such as fuel in the carburetor remains at the oil level A. If left as it is, the fuel will be sucked up through the side holes 17 and holes 18 by the capillary action of the porous member 13, and will be discharged from the flexible tube 19 to the outside of the carburetor. This phenomenon continues until there is no fuel, etc., and ends in about two weeks.

The above case has the following effects.

(1) Moisture that settles on the bottom surface of the float chamber of the carburetor is automatically discharged to the outside of the carburetor, which prevents rusting of the constituent materials of the carburetor and prevents engine troubles caused by this.

(2) The fuel in the carburetor float chamber is automatically discharged to the outside of the carburetor, eliminating any gasoline deterioration, thereby preventing engine starting problems and troubles.

(3) By integrating the covering body 20 and the suction body 11, the strength of the suction body 11 is improved, there is no fear that cracks will occur in the porous member 13, and the appearance is more decorative.

(4) By installing the covering body in the concave portion 22a of the support member 22, movement of the covering body 20 in the direction of arrow A is prevented, and the main nozzle bolt 2
3 to the carburetor main body 01, the collar portion 12a can be reliably clamped and fixed between the bent portion 22c and the thick portion 15 via the O-ring 24 and the washer 25.

FIG. 7 is a sectional view showing the main parts of another embodiment of the present invention, and corresponds to FIG. 3. FIG. 8 is a sectional view taken along the - arrow in FIG. 7, and shows only the fuel discharge device.

In the figure, the mounting state of the fuel ejecting device has been moved counterclockwise compared to FIG. 3 of the above-described embodiment, and the support member 22 is eccentric from the center of the carburetor as shown in FIG. 7. Furthermore, the cover 31 is thinned to avoid interference with the support member 22.

This embodiment has the same functions and effects as the embodiments described above, and the extent to which the fuel discharge device protrudes from the carburetor is extremely reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional float type carburetor, FIG. 2 is a sectional view showing an embodiment of the carburetor according to the present invention, and FIG. 3 is a sectional view taken along the - arrow in FIG.
Fig. 4 is a sectional view taken in the - arrow direction of Fig. 2, Fig. 5 is a sectional view taken in the - arrow direction of Fig. 2, and Fig. 6 is a sectional view taken in the - arrow direction of Fig. 5.
FIG. 7 is a sectional view showing essential parts of another embodiment of the present invention, and FIG. 8 is a sectional view taken along the - arrow in FIG. 7. 01... Vaporizer main body, 11... Suction body, 12
... Discharge pipe, 12a ... Flange, 13 ... Porous member, 14 ... Float chamber, 16 ... Vertical hole, 20 ...
... Covering body, 22 ... Support member, 23 ... Main nozzle bolt.

Claims (1)

[Scope of utility model registration request] A hollow discharge pipe is filled with a porous member to form a suction body, and one end of the suction body is inserted into a receiving hole provided in the peripheral wall of the float chamber of the vaporizer to open the float chamber. In a device for discharging the fuel in the float chamber by capillary action of the porous member, the other end is opened outward, and the periphery of the suction body outside the carburetor is covered. A covering made of synthetic resin formed integrally with the suction body, and a fixing device for clamping the fuel discharge device made of the suction body and the coating between the carburetor main body and the float chamber. Features a carburetor fuel discharge device.