JPS6240109Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to a technical field in which a carburetor attached to an automobile engine uses gasoline mixed with alcohol.

In this invention, the main nozzle facing the bench lily provided in the barrel communicates with the gasoline port facing the float chamber via the main well, while the alcohol port facing the lower side of the gasoline port communicates with the passage. The carburetor structure is connected to the main well through a bypass, and the negative pressure inside the bench lily causes the gasoline and alcohol in the float chamber to be mixed and ejected from the main nozzle through the gasoline port and the alcohol port, respectively. In particular, when the above passage is cold, the alcohol port and main well are connected,
This invention relates to a carburetor structure for alcohol gasoline in which a temperature control opening/closing valve that shuts off when the temperature is high is interposed, so that the passage can be automatically opened and closed depending on the temperature state of the engine, and the amount of alcohol ejected is controlled.

<Prior Art> As is well known, in recent years so-called alcohol gasoline, which is a mixture of gasoline and 10 to 20% alcohol, has been widely used as a driving fuel for the engines of vehicles such as automobiles.

The advantage of this is that alcohol has better volatility than regular gasoline, so it can run leaner when cold and improve starting performance.
Not only can it prevent emissions, but it also has the advantage of increasing the octane number and advancing the ignition timing, resulting in improved engine performance.

<Problems to be solved by the invention> However, since the seed alcohol has better volatility than gasoline, it has various advantages as mentioned above, but when the engine and fuel are relatively high temperature, the alcohol will not reach the float chamber. Vapor is likely to be generated in the main well from the main nozzle to the main nozzle, forming coarse bubbles and filling the main well, causing a so-called vapor lock.As a result, the fuel does not flow through, resulting in over-lean conditions, resulting in engine stall, etc. There was a problem.

In addition, during a high-temperature de-soak, vapor and raw gas flow down from the main nozzle, causing so-called percolation, which can lead to over-richness when starting after a high-temperature de-soak, resulting in poor starting or misfire. However, there was a problem in that it caused unstable idling, which was also a cause of worsening exhaust gas.

To deal with this, there is a device proposed in Japanese Patent Application Laid-Open No. 56-107939, but in the conventional type of device, the cutoff valve at high temperature for the alcohol port is operated by time control such as a timer. Another drawback is that it is not possible to automatically cut off the supply of alcohol in response to temperature changes from cold to high temperatures.

The purpose of this invention was to solve the problem of alcohol supply in the alcohol gasoline carburetor structure based on the conventional technology. A temperature control opening/closing valve is interposed in the passage from the alcohol port of the engine, so that the passage is automatically opened and closed according to changes in engine temperature, and the supply of alcohol is controlled according to changes in engine temperature. The object of the present invention is to provide an excellent carburetor structure for alcohol gasoline that is useful for engine operation technology in the transportation industry.

<Means/effects for solving the problem> In accordance with the above-mentioned purpose, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claim, is to solve the above-mentioned problem. , or
When starting after a high-temperature desoak, the temperature of the carburetor rises due to heat transfer from the exhaust manifold, radiant heat, etc., and the main well is heated to a relatively high temperature. When the main well is heated to a relatively high temperature, the alcohol port of the float chamber that bypasses and connects to the main well A temperature-controlled on-off valve installed in the passage from the main well automatically shuts off the passage and prevents alcohol from passing through, allowing only gasoline to flow and preventing vapor generation in the main well. On the other hand, at room temperature such as when cold, the temperature control opening/closing valve automatically opens the passage and communicates with it, allowing alcohol and gasoline to be properly mixed in the main well and jetted out from the main nozzle. Technical measures have been taken to make this possible.

<Example> Next, an example of this invention will be described below based on the drawings. In addition, the same parts in each figure shall be explained using the same reference numerals.

In the embodiment shown in FIGS. 1 and 2, 1 is a carburetor, which is the central point of this invention, and a barrel 2
A throttle valve 3 is provided downstream of the engine, and a large bench lily 4 and a small bench lily 5 are provided upstream of the same as in the general embodiment.

On the other hand, a main well 7 communicating with a main nozzle 6 facing the small bench lily 5 has a main jet 8 in the middle and is connected to a gasoline port 10 facing a float chamber 9.

An alcohol port 11 is provided at the bottom of the gasoline port 10, and a passage 12 communicating with the alcohol port 11 is connected to the main jet 8 of the main well 7 and the gasoline port 10 through a temperature control valve 13. It is connected by bypass between.

As shown in FIG. 2, the temperature control on-off valve 13 is provided with a seal ring 14 on the alcohol port 11 side, and the engine 14 is in close contact with the seal ring at a relatively high temperature.
A bimetal 15 that blocks the 2 is supported at one end and is installed inside.

By the way, the gasoline 16 and alcohol 17 that have flowed into the float chamber 9 are essentially non-mixable, and the specific gravity of the alcohol 17 is high, so they form a layer in the float chamber 9, and the former forms a layer at the gasoline port 10. , the latter are respectively sucked from the alcohol ports 11.

In the above-mentioned configuration, the operation is explained as follows. During steady driving, the gasoline 16 and alcohol 17 in the float chamber 9 are pumped to the gasoline port 10 and the alcohol 17, respectively, due to the negative pressure in the small bench lily 5 according to the opening degree of the throttle valve 3. It passes through the main well 7 through the port 11 from the passage 12 with the bimetal 15 open, is mixed before the main jet 8, and is distributed and supplied to each cylinder from the main nozzle 6 at an appropriate air-fuel ratio. be done.

On the other hand, the engine temperature rises during relatively high-load driving, and the carburetor 1 is heated by heat transfer and radiant heat from the exhaust manifold, etc., and the area around the main well 7 is directly affected by the heating due to its structure. The temperatures of gasoline 16 and alcohol 17 inside rise, and vapor tends to be generated from alcohol 17, which has good volatility.

However, in this invention, the bimetal 15 of the temperature-controlled on-off valve 13 installed in the passage 12 is thermally deformed by the temperature and comes into close contact with the entire circumference of the seal ring 14 as shown by the solid line in FIG.
2 automatically shuts off the flow of alcohol 17 and prevents the gasoline 16 from flowing from the gasoline port 10.
only is supplied to the main nozzle 6 and therefore
No coarse bubbles are formed in the main well 7 due to the alcohol 17.

Therefore, even when starting the engine after a high-temperature desoak, only gasoline without vapor bubbles is sucked in, and normal engine operation is immediately performed.

In another embodiment shown in FIG. 3, the electromagnetic valve 18 of the temperature control on-off valve 13' is connected to
2', and its electromagnetic coil 19 is connected in series with the thermo switch 20, ignition switch 21, and power supply 22, and the ignition switch 21 is turned on, even if the area around the engine is at room temperature. For example, when the thermo switch 20 is OFF, the valve body 23 of the solenoid valve 18 is compressed by the compression spring 24.
The passage 12' is maintained in a retracted state by
The alcohol port 11 and the main well 7 are communicated with each other to allow the alcohol 17 to flow therethrough.

On the other hand, when the engine is running at a relatively high temperature or when starting after a high-temperature desoak, the thermoswitch 20 detects the temperature and turns on, forming a closed circuit and energizing the electromagnetic coil 19. The valve body 23 is made to protrude against the compression spring 24, and the needle 25 provided at the tip is automatically brought into close contact with the seat 26 provided in the passage 12', thereby blocking the passage 12'.

It goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments, and various embodiments can be adopted, for example, the temperature control opening/closing valve may be provided at the alcohol port.

<Effects of the invention> As described above, according to this invention, basically in the carburetor structure for alcohol gasoline, the alcohol in the float chamber is Since the passage from the port is bypassed and connected via a temperature control opening/closing valve, basically during relatively high load operation and when starting after a high temperature de-soak, heat transfer and radiation from the exhaust manifold etc. When the main well is heated and the alcohol flowing through the main well tends to generate vapor, the temperature control opening/closing valve is activated and automatically shuts off the passage, preventing the alcohol from flowing into the barrel. Since only gasoline is supplied, vapor lock caused by alcohol is prevented, and percolation is also prevented, resulting in the excellent effect of avoiding engine stalls, rough idling, etc., and providing smooth driving performance. be done.

Therefore, when starting after a high-temperature desoak, there are no difficulties in starting or engine misfires, battery build-up is prevented, and exhaust gas deterioration is also prevented.

Therefore, there is an advantage that fuel consumption is reduced and economical and resource saving is further increased.

Therefore, in this invention, a temperature-controlled opening/closing valve installed in the passage from the alcohol port to the main well is automatically controlled to connect the alcohol port and the main well when the temperature is cold, and close it when the temperature is high. Because the alcohol port and main well passage are installed in such a way that the opening and closing of the alcohol port and main well passage are completely automatically controlled according to temperature changes, no vapor lock occurs and stable engine operating characteristics are obtained. The effect is produced.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of an embodiment of this invention, and the first
The figure is a schematic sectional view of the embodiment, FIG. 2 is an enlarged view of the same essential part, and FIG. 3 is a schematic sectional view of another embodiment. 2... Barrel, 5... Bench lily, 6... Main nozzle, 9... Float chamber, 10... Gasoline port, 7... Main well, 11, 11'...
Alcohol port, 12, 12'... passage, 1...
...Carburetor, 13,13'...Temperature control opening/closing valve.

Claims (1)

[Scope of utility model registration request] In an alcohol gasoline carburetor structure in which a passage from an alcohol port facing the float chamber is bypassed and connected to a main well that communicates a main nozzle of a bench lily in the barrel with a gasoline port facing the float chamber, the passage A carburetor structure for alcohol gasoline, characterized in that a temperature control opening/closing valve is installed which is automatically controlled to communicate the alcohol port and the main well when it is cold and shut it off when it is hot.