KR0160872B1 - Carburetor for an automobile - Google Patents

Abstract

The present invention discloses an improved carburetor for automobiles. In the related art, since a heater for heating a mixer is configured to use a metal heating wire as a heating element, there is a risk of short-circuit or burnout due to overheating, and there is a problem that the heating efficiency is very low and the temperature increase time is long due to the small amount of heat generated per unit area.

In the present invention, a PTC heater composed of a plate-shaped PTC thermistor, a pair of heat dissipation plates attached to both sides thereof, a far-infrared radiation anti-oxidation layer coated around the PTC thermistor including the heat dissipation plate pair, and an NTC for measuring the temperature of the mixer. The temperature sensor was installed at the outlet of the venturi tube of the vaporizer, so that the mixer below the predetermined temperature was sufficiently and uniformly heated in a short time with low power consumption without short circuit and burnout caused by overheating.

Description

Carburetor

1 is a cross-sectional view showing a conventional mixer heating apparatus.

2 is a cross-sectional view schematically showing a vaporizer according to the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view showing the mixer heating means of the present invention.

* Explanation of symbols for main parts of the drawings

1: Venturi building 2: Venturi building (of Venturi building)

4: Throttle Valve 5: Flow Chamber

6: main nozzle

10: PTC (Positive Temperature Coefficient) heater

12: PTC thermistor 14: heat sink

15: antioxidant layer

The present invention relates to a motor vehicle, and more particularly, to a carburetor for mixing fuel and air supplied to an engine at an appropriate ratio.

An automobile is a device driven by an engine that generates power by compressing and exploding a mixture of fuel and air such as gasoline at an appropriate ratio. Such a mixer is properly mixed with fuel and air in a carburetor and then supplied to the engine through an intake manifold.

In this way, since the engine generates power by combustion of the mixer, the exhaust gas is emitted from the automobile. The exhaust gas includes carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx), which are factors of air pollution. This large amount is included. Since such exhaust gas is generated by incomplete combustion of the mixer, the complete combustion of the mixer is of primary importance in order to reduce the exhaust gas and obtain high power with low fuel consumption.

However, the mixing ratio required for complete combustion requires a mixing ratio of air 15 to gasoline 1 in terms of the theoretical weight, and the mixing ratio that is actually combustible is in the range of 8 to 20. Accordingly, since complete combustion by the mixing ratio is virtually impossible, methods for promoting the vaporization of the fuel to promote the complete combustion of the mixer are generally used.

Figure 1 schematically shows an example of a conventional method for this. This is provided with a plurality of heaters (H) and temperature sensors (S) on one side of the mixer flow pipe (P) between the vaporizer (C) and the intake manifold (M), the mixer detected by the temperature sensor (S) Heater H is operated when the temperature is below a predetermined temperature, and heats the mixer to flow, thereby providing heat of vaporization to the fuel.

However, in the conventional method, since the heater H uses a normal metal heating wire as its heating element, the amount of heat generated per unit area is small, and the heater H cannot sufficiently heat the heater H. Since only one side is provided, there is a problem that it is difficult to uniformly heat the mixer. In addition, there is a high possibility that the heating wire is short-circuited when the excessive current is drawn, and there is a problem that the flow pipe P may be burned due to overheating. Therefore, the conventional method is not able to completely burn the mixer, and did not contribute to the improvement of the performance of the vehicle and the reduction of harmful gas.

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a carburetor for an automobile which can be supplied to an engine by heating the mixer sufficiently and uniformly without fear of short circuit or overheating in view of the above-described conventional problems.

In order to achieve the above object, a carburetor for automobiles according to the present invention includes a flow chamber for storing a predetermined amount of fuel, a venturi tube for mixing fuel and air to be supplied to an intake manifold, and a mixer passing through the intake manifold. In an automobile carburetor having a throttle valve that adds or subtracts a quantity, a plate-shaped plate is formed inside the venturi tube between the throttle valve and the intake manifold, and the mixer is heated to an appropriate temperature. PTC (Positive Temperature Coefficient) having a PTC thermistor, a pair of heat sinks bonded to a positive electrode layer of the PTC thermistor with a conductive adhesive, respectively, and an antioxidant layer formed at an appropriate thickness around the PTC thermistor including the heat sink pairs. It is characterized by including a heater.

According to one preferred feature of the invention, the venturi tube further comprises a temperature sensor for measuring the temperature of the mixer, it is configured to operate the PTC heater when the temperature of the mixer by the detection of the temperature sensor is below a predetermined temperature.

Accordingly, the present invention is capable of heating the mixer sufficiently and uniformly without any fear of overheating as in the prior art, and thus greatly improves the combustion efficiency of the engine, thereby greatly improving the performance of the vehicle, reducing fuel consumption, and reducing harmful gas emissions. Will be exercised.

Such specific features and other advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the attached drawings.

In Figures 2 to 4, the carburettor according to the present invention is a flow chamber (5) in which the fuel (F) is supplied from the fuel tank (f) is stored a certain amount of fuel (F), It is provided with a venturi tube 1 in which air is sucked from the outside and mixed at a proper ratio with the fuel supplied from the flow chamber 5. The flow chamber 5 has a main nozzle 6 which protrudes into the venturi part 2 of the venturi tube 1 and injects a large amount of fuel F by the flow of air, and the venturi part 2 of the venturi part 2. A low speed nozzle 7 is provided which communicates with the lower part and supplies a small amount of fuel F thereto. The flow chamber 5 includes a needle valve 8 for controlling the amount of fuel supplied from the fuel tank, and a floater 9 for controlling the needle valve 8 in association with the stored amount of fuel.

A choke valve 3 for controlling the amount of air sucked is provided above the venturi part 2 in the venturi tube 1, and a passage amount of the mixer to the intake manifold is added to the bottom of the venturi part 2. Throttle valve 4 is provided.

According to the characteristics of the present invention, a heater is provided at the inner circumference of the venturi tube 1 at the lower side of the throttle valve 4 so as to promote vaporization of the mixer by heating it to an appropriate temperature to impart heat of vaporization. It consists of what is called a PTC heater 10 which uses the PTC thermistor which has the thing as a heat generating body. The PTC heater 10 is preferably provided in a plurality of radially around the inner circumference of the venturi tube 1 for uniform and sufficient heating of the mixer.

PTC thermistors are known as N-type titanic acid, which has conductivity by adding barium titanate (BaTiO ₃ ) as the main component, PbTiO ₃ , a small amount of CaTiO ₃ , and a small amount of rare earth elements such as MnO ₂ and Y, La, and Sb. A kind of barium oxide semiconductor, which conducts as a conductor at normal operating temperature due to the phase transition at the characteristic curie point of barium titanate, but when overheated, the resistance rapidly increases and becomes inconductive as a nonconductor. Has the property of being.

The preferred configuration of the PTC heater of the present invention using the PTC thermistor having such a characteristic as a heating element will be described with reference to FIG.

The PTC heater 10 of the present invention is a heat generating body 11 for dissipating heat and an insulating cap 16 for electrically insulating the heat generating body 11 from the outside and fixing it to the venturi tube 1. It is composed.

In the center of the heat generating body 11, a plate-like PTC thermistor 12 is provided as a heating element. On both opposite sides of the PTC thermistor 12, electrode layers for applying power thereto are formed, respectively. In the manufacturing process of the PTC thermistor 12, such an electrode layer is formed by printing a metal powder on the surface of a molded and sintered PTC sintered body with Ag paste and then performing heat treatment.

The PTC thermistor 12 is manufactured by a general ceramic (ceramic) manufacturing process, it may be composed of a single body, but is preferably composed of a plurality of units 13 as shown for easy manufacturing sequentially It is configured to form a body by being stacked.

On both electrode layers of the PTC thermistor 12, a heat sink 14 made of copper (Cu), aluminum (Al), or the like having excellent thermal conductivity is attached to the both electrode layers for easy heat dissipation. Accordingly, each of the heat sinks 14 is provided with terminals 14a for receiving power from an external power source, and an epoxy or polyimide-based electroconductive adhesive having excellent conductivity to the PTC thermistor 12 is also provided. Is bonded by.

On the other hand, since the PTC heater 10 is exposed to air and fluid, it is easy to oxidize and corrode over a long period of time. The antioxidant layer 15 is provided for the protection of 10). The anti-oxidation layer 15 may be formed in various forms. Preferably, the anti-oxidation layer 15 is constituted by coating SiO ₂ or ZrO ₂ based far-infrared radiation ceramics on the heat sink 14 for easy heat dissipation and improved heating efficiency. It includes a coating material.

On the other hand, if the temperature of the mixer is high, the vaporization thereof can be promoted, and even distribution of the mixer can be achieved. However, if the temperature is too high, the disadvantage is that the volume efficiency is lowered. Accordingly, it is necessary to properly control the operation of the PTC heater 10 according to the temperature of the mixer. Preferably, the temperature of the mixer is measured on one side of the venturi tube 1, and the operation of the PTC heater 10 according to the result is performed. Temperature sensor 20 for controlling the is provided.

The temperature sensor 20 may be configured in various ways. Preferably, since the operation of the PTC heater 10 should be automatically turned on / off according to the temperature of the mixer, a negative temperature is required. It consists of NTC temperature sensor using characteristic NTC (Negative Temperature Coefficient) thermistor. In contrast to PTC thermistors, NTC thermistors have a characteristic that, when the ambient temperature is low, the resistance value increases and conduction becomes impossible, and when the ambient temperature is high, the resistance value decreases to conduct current.

The action of the carburetor for automobiles according to the present invention configured as described above is as follows.

When the engine is started, air is sucked into the venturi tube 1, and the flow rate is sucked from the venturi unit 2, so that the air pressure in this portion is lowered. Accordingly, the fuel (F) is accompanied by the air from the main nozzle (6), at this time, the fuel (F) is swept by the air while being atomized and mixed with the air flows to the intake manifold side. The amount of the mixer flowing in this way is appropriately adjusted by the throttle valve 4.

At this time, the temperature of the mixer is measured by the temperature sensor 20, and as a result, the PTC heater 10 is operated when the set temperature is below the predetermined temperature to heat the mixer to an appropriate temperature. That is, since the external temperature is very low at the initial startup of the engine or during cold cooling, the current does not flow in the temperature sensor 20. The controller detects this and applies power to the PTC heater 10. Then, power is transferred to the electrode layer of the PTC thermistor 12 through each heat sink 14, and accordingly, the PTC thermistor 12 self-heats and releases heat. The released heat is transferred to the heat sink 14 and released to the outside through the antioxidant layer 15 to heat the mixer. At this time, in the anti-oxidation layer 15, the far infrared rays are radiated together and penetrate deeply into the mixer, thereby oscillating, resonating, and resonating their own molecules, thereby maximizing the heating efficiency of the mixer.

Then, the liquid fuel particles are given heat of vaporization by heating, the viscosity decreases, the particle motion becomes active, and the vaporization is promoted. Accordingly, the combustion efficiency in the engine is greatly increased. As a result, the engine's thermal efficiency increases, resulting in improved performance, fuel savings, and significantly reduced emissions.

Even if an overcurrent flows into the PTC heater 10 during the heating of the mixer, the PTC thermistor 12 has a self-control characteristic, so that there is no fear of overheating, and since the amount of heat generated per unit area is large and far-infrared rays are emitted together, It is possible to heat the mixer sufficiently and uniformly in a short time.

On the other hand, when the temperature of the mixer increases by such heating and exceeds a predetermined temperature, current flows to the temperature sensor 20, so that the control unit senses this and stops the heating of the mixer by blocking the application of power to the PTC heater 10. .

As described above, according to the present invention, the mixer can be sufficiently and uniformly heated in a short time with low power consumption without short-circuit or burnout of the heater due to overheating. Accordingly, the vaporization is facilitated to facilitate the combustion of the mixer, thereby greatly increasing the combustion efficiency in the engine.

Therefore, the present invention has a very excellent effect in improving the performance of an automobile engine, reducing fuel, and reducing harmful exhaust gas.

Claims (3)

A carburettor including a flow chamber for storing a predetermined amount of fuel, a venturi tube for mixing fuel and air to be supplied to an intake manifold, and a throttle valve for regulating the passage amount of the mixer to the intake manifold, A plate-shaped PTC thermistor 12 installed inside the venturi tube 1 between the throttle valve 4 and the intake manifold for heating the mixer to an appropriate temperature, and having electrode layers formed on opposite sides thereof. ), A pair of heat sinks 14 bonded to both electrode layers of the PTC thermistor 12 with a conductive adhesive, and to which power is applied, and the PTC thermistors 12 including the pair of heat sinks 14 at an appropriate thickness. A carburetor for automobiles, comprising a PTC heater (10) having a positive temperature characteristic having an anti-oxidation layer (15) formed. 2. The carburetor for automobile according to claim 1, wherein the anti-oxidation layer (15) is composed of SiO ₂ or ZrO ₂ based far-infrared radiation ceramics. The carburetor for automobile according to claim 1, wherein the anti-oxidation layer (10) comprises an oil resistant coating material.