JPH0240066A - Carburetor - Google Patents

Abstract

PURPOSE:To check icing to the full by forming a carburetor body with a plastic material containing conductive materials, and setting up an on-off switch which controls an electric current flowing into the carburetor body for its circuit making. CONSTITUTION:A butterfly type throttle valve free of rotation is set up in an intake passage 2. A level of constant fuel is formed in a float chamber 5. A carburetor body 1 is made up of a plastic material containing conductive materials. A driver closes an on-off switch 10 in an electric circuit of the carburetor body 1, thereby making an electric current flow into the carburetor body 1. Accordingly, the whole carburetor body is subjected to self-heating and thereby its temperature goes up. Thus, any icing in the carburetor is completely checkable in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carburetor that controls the concentration and amount of air-fuel mixture supplied to an internal combustion engine.

[Conventional technology]

Among the components of a carburetor, the largest component is the carburetor body, and an intake passage is provided through the carburetor body, with one end connected to the air cleaner and the other end connected to the engine.

Conventionally, a body integrally molded from polyamide resin or the like has often been used as the main body of the vaporizer.

This product takes advantage of the excellent features of synthetic resin materials, such as their light weight, excellent contact resistance, and smooth intake tract surface roughness. The aim is to provide a vaporizer with excellent tactility, light weight, and high inhalation efficiency.

[Problem to be solved by the invention]

However, although the carburetor body made of synthetic resin material has the above-mentioned nine excellent functions, it has a lower thermal conductivity than the carburetor body made of metal such as aluminum or zinc, resulting in the following problems: has.

Incidentally, the thermal conductivity of aluminum is 2.3 can/sec/cm2/'O/am, and the thermal conductivity of polyamide resin is 0.4 can/sec/cm2/°C/cm.

Generally, the air that flows into the intake duct of the carburetor body through an air cleaner contains some saturated water vapor, and when this intake air is cooled, the carburetor body is also cooled, and the air The humidity becomes supersaturated with respect to the cooled temperature, and moisture accumulates and adheres to the inner wall of the intake duct of the carburetor body in the form of mist.

On the other hand, the main body of the carburetor is one in which atomized gasoline fuel is continuously flowed through the intake duct inside the main body, and this atomized gasoline cools the intake duct by latent heat of vaporization.

Then, when the temperature of the carburetor body including the intake passage drops below O'C, the above-mentioned mist water condenses and becomes ice.
It adheres to the inner surface of the intake tract and reduces the effective area of the intake tract, which may reduce the amount of intake air taken into the engine and cause the engine to malfunction. (So-called icing phenomenon) When the vaporizer body is made of synthetic resin material,
Because its thermal conductivity is lower than that of metals, it is difficult to cool down in the early stages of operation, but once the temperature drops below -°C, it is difficult to transfer or receive heat from the outside, so it is difficult to expect the temperature to rise. Icing is more likely to occur compared to the carburetor body made of

[Means to solve problems]

The carburetor for an internal combustion engine according to the present invention has been created in view of the above-mentioned problems, and aims to provide a carburetor with good icing resistance while retaining the excellent features of synthetic resin materials. In order to achieve the above object, the main body of the carburetor is made of a synthetic resin material containing a conductive material, and an electric current is passed through the intake pipe.

[Effect]

By directly passing a current through the synthetic resin material containing a conductive material, the carburetor body generates heat on its own, increasing the temperature of the carburetor body, thereby lowering the engine atmosphere temperature. Alternatively, the temperature can be maintained at a constant temperature or higher regardless of the temperature drop due to latent heat of vaporization.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a carburetor main body through which an intake passage 2 passes, one side (left side in the figure) of this intake passage 2 is connected to an air cleaner (not shown), and the other side (right side in the figure) is connected to an engine ( (not shown). Further, a freely rotatable butterfly-type throttle valve 3 is disposed within the intake passage 2, and the effective opening area of the intake passage 2 is controlled by this throttle valve 3.

Reference numeral 4 denotes a float base body disposed below the carburetor body 1, and a float chamber 5 is formed by the concave portion of the carburetor body 1 and the float base body 4.

A constant fuel level is formed in the float chamber 5 by the cooperation of the float 6, a valve seat (not shown), and the float pulp.

Reference numeral 7 designates a main nozzle whose one end opens into the intake passage 2 and whose other end communicates with a constant liquid level in the float chamber 5 via a main jet 8.

The above is a conventionally known carburetor, in which when negative pressure is generated in the intake passage 2, the fuel stored in the float chamber is sucked out into the intake passage 2 from the fuel injection hole such as the main nozzle. be.

In order to solve the above-mentioned problems, the carburetor according to the present invention has a main body l as follows.

That is, the vaporizer main body 1 is formed of a composite resin material having a resin material such as polyamide as a base material and containing powder or fibers of a conductive material such as carbon in the base material.

An electric circuit in which a power source 9 and an on/off switch 10 are arranged in series is connected to this vaporizer main body 1, so that current can flow directly to the vaporizer main body 1.

According to the carburetor of the present invention, when the engine is operated in November, December, March, April, etc. when the ambient temperature of the engine is relatively low and the humidity is relatively high, the driver closes the on/off switch 10 in the electric circuit of the carburetor body 1 to allow current to flow through the carburetor body 1. According to this, since a conductive material is contained in the synthetic resin forming the vaporizer main body 1, the entire vaporizer main body 1 generates heat by itself, thereby raising the temperature of the vaporizer main body 1.

Therefore, the temperature of the carburetor body 1 itself will not drop below 0°C even if it receives the vaporizer latent heat of the fuel, and even if humid air containing supersaturated humidity flows through the intake passage 2. , no ice was formed on the inner wall of the intake passage 2, and icing could be completely suppressed.

The temperature rise of the vaporizer main body 1 with respect to the current applied to the vaporizer main body 1 can be determined by appropriately selecting the content ratio of the conductive material contained in the synthetic resin material as the base material or the type of the conductive material. Examples of conductive materials include iron, copper, chromium, carbon, tungsten, nickel chromium, molybdenum, etc., and examples of synthetic resin materials as base materials include polyacetal, polyolefin, polystyrene, polycarbonate, polyamide, etc. Yes, it must be selected appropriately according to the purpose.

Furthermore, if the open/close switch 10 is replaced with a manual switch and is replaced by a heat-sensitive switch that closes only when the engine ambient temperature is below a certain temperature, the carburetor main body 1 can be automatically warmed to a constant temperature when the engine ambient temperature is low. It is. Further, in this embodiment, a butterfly type vaporizer is shown, but the same effect can be achieved with any type of vaporizer such as a sliding throttle valve type vaporizer or a constant vacuum type vaporizer.

〔Effect of the invention〕

As described above, the carburetor for an internal combustion engine according to the present invention provides the following effects.

■While having the advantages of a vaporizer body made of synthetic resin material, such as light weight, good corrosion resistance, and good tube inner surface roughness,
Furthermore, since the vaporizer main body generates its own heat and prevents the temperature of the vaporizer main body from decreasing, it is possible to completely prevent icing in a vaporizer using synthetic resin.

■ By making the vaporizer body self-heat, it is possible to raise the temperature throughout the vaporizer itself, including the inside, which further improves the reliability of preventing icing compared to partial heating. This is what was created.

■If the on/off switch placed in the electrical circuit of the carburetor body is a heat-sensitive switch, heating of the intake pipe will be done automatically and reliably below a certain low temperature, eliminating the need for skill. be.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of a carburetor in an internal combustion engine according to the present invention. 1. Carburetor body 2. Intake path 3. Throttle valve 9. Power supply 10. Open/close switch.

Claims (5)

[Claims] (1) A carburetor body through which an intake passage passes through, and which is equipped with a throttle valve that controls the effective opening area of the intake passage; A float chamber formed by storing a constant liquid level inside; ; In a carburetor for an internal combustion engine, which is capable of sucking the fuel in the float chamber into the intake tract via the fuel passage by the negative pressure generated in the intake tract, the carburetor body is made of a synthetic resin material containing an electrically conductive material. A vaporizer that is formed. (2) A carburetor main body through which an intake passage passes through, and which is equipped with a throttle valve that controls the effective opening area of the intake passage; A float chamber formed by storing a constant liquid level inside; ; In a carburetor for an internal combustion engine, which is capable of sucking the fuel in the float chamber into the intake tract via the fuel passage by the negative pressure generated in the intake tract, the carburetor body is made of a synthetic resin material containing an electrically conductive material. A carburetor is formed by passing an electric current through the intake pipe. (3) A carburetor main body through which an intake passage passes through, and which is equipped with a throttle valve for controlling the effective opening area of the intake passage; and a float chamber formed by storing a constant liquid level inside. ; In a carburetor for an internal combustion engine, which is capable of sucking the fuel in the float chamber into the intake tract via the fuel passage by the negative pressure generated in the intake tract, the carburetor body is made of a synthetic resin material containing an electrically conductive material. A vaporizer comprising: a switch for controlling opening/closing of a current flowing to the vaporizer main body; (4) The carburetor according to claim 3, wherein the opening/closing switch is a manual changeover switch. (5) The vaporizer according to claim 3, wherein the opening/closing switch is a heat-sensitive switch that automatically closes the electric circuit only when the temperature is below a certain temperature.