CN1372073A

CN1372073A - Heater for preventing carburetor from icing up

Info

Publication number: CN1372073A
Application number: CN 02105178
Authority: CN
Inventors: 吴武夫
Original assignee: Keihin Dock Co Ltd
Current assignee: Keihin Corp; Keihin Dock Co Ltd
Priority date: 2001-02-26
Filing date: 2002-02-25
Publication date: 2002-10-02
Anticipated expiration: 2022-02-25
Also published as: CN1212473C; JP2002256976A; TW509750B; HK1048842A1; JP4009987B2

Abstract

The present invention provides a heater for preventing a carburetor from icing up. An air inlet passage 2 of a carburetor main body 1 is formed sideway, and the float chamber 6 on which a constant fuel liquid level X-X is formed with a float chamber main body 5 is arranged below the carburetor main body 1. An electric heater 13 is arranged on the float chamber main body 5, a longitudinal axial line A-A of the electric heater 13 is arranged roughly in parallel with the fuel liquid level X-X in the float chamber 6 as well as a longitudinal axial line Y-Y of the air inlet passage 2 and the electric heater is arranged in the neighborhood of the by-pass chamber 10. Thus, the present invention is capable of effectively warming a by-pass hole of the by-pass chamber and restraining fuel evaporation of fuel reserved in the float chamber.

Description

The preventing to freeze of Carburetor used heater

Technical field

The present invention relates to Carburetor that the amount and the concentration of the mixed gas of supply engine are adjusted, controlled, wherein be particularly related to prevent over against the end of air throttle and the bypass opening of opening freeze prevent freeze with heater the installation of usefulness heater (prevent freeze).

Background technique

The icing heater of using that prevents of existing Carburetor is described according to Fig. 2.

The 1st, run through in the side that it is inner and the carburetor main body on air-breathing road 2 is set, use to be tabular 3 pairs of air-breathing roads 2 of butterfly type air throttle and to carry out open and close controlling.

This air throttle 3 is screwed on the solar term valve shaft 4 that is supported on carburetor main body 1 free to rotately, and the operator opens and closes 3 pairs of air-breathing roads 2 of air throttle by this solar term valve shaft 4 of rotating operation.

The below recess 1A of carburetor main body 1 is formed float chamber 6, so have: valve seat 7 thus by 5 sealings of cup-shaped float chamber main body in float chamber 6; The float-controlled valve 8 that valve seat 7 is opened and closed; Float-controlled valve 8 is applied the float 9 of above-mentioned opening and closing operations, and pass through the fixedly level of fuel X-X of leveling device formation.

And the major axis heart direction Y-Y along air-breathing road 2 below the air-breathing road 2 of carburetor main body 1 is provided with bypass chamber 10, from bypass chamber 10 towards air-breathing road 2 inner openings and bypass opening 11 is set.Because this bypass opening 11 faces the end of air throttle 3 and opening, so the supply of the low speed fuel when this bypass opening 11 is mainly being undertaken the low-speed running of motor.

The 12nd, fall in the heater mounting hole of setting from the lower end 5B of float chamber main body 5 towards the upside of bypass chamber 10, form female thread from lower end 5B towards upside.And will be by energising the electric heater 13 of inner heat body heating be screwed in the above-mentioned heater mounting hole 12.

When engine running, above-mentioned electric heater is energized, and bypass chamber 10 and bypass opening 11 are heated by the heating of heater 13 thus, prevents freezing of bypass opening 11.

Existing Carburetor has following problem.

At first, the bypass chamber 10 that comprises bypass opening 11 can not be heated effectively by electric heater 13.

This be because: the generating heat department of electric heater 13 is a drum, generating heat department is made of the sidepiece 13A of the big heating area of the excircle with cylindrical part and the upper bottom portion 13B of the little heating area of the front end with cylindrical part, dispose sidepiece 13A orthogonally with the long shaft axis Y-Y on air-breathing road 2 with so big heating area, so, at first the sidewall 5A of float chamber 5 is heated from a large amount of heats that sidepiece 13A emits, secondly this heat transfer is heated to bypass chamber 10, bypass opening 11 to upside.

And, because the needs in the female thread processing, between the upper bottom portion 13B of the upper end of heater mounting hole 12 and electric heater 13, certainly exist space portion S, in order to improve the heat-transfer effect of this space portion S, repack with grease therein, the assembling performance of electric heater 13 has been subjected to very big obstruction thus.

And, dispose the sidepiece 13A with big heating area of electric heater 13 along float chamber main body 5 interior bunkering directions (above-below direction among the figure), fuel in the float chamber 6 is heated by sidewall 5A easily thus, and is bad on this aspect of fuel vaporization in suppressing float chamber 6.

And, if in electric heating 13, load onto energising wire harness (not shown), in fact improved the whole height of Carburetor, hindered the load degrees of freedom of motor thus.

Summary of the invention

In view of above-mentioned unsatisfactory situation, the purpose of Carburetor of the present invention is to provide a kind of icing heater of using that prevents of Carburetor, can heat to the bypass opening that comprises bypass chamber effectively, and the fuel vaporization in the float chamber that suppresses to cause because of electric heater.

Carburetor of the present invention prevent to freeze in order to achieve the above object with heater, in Carburetor, possess: run through the carburetor main body that air-breathing road is set in the side, air-breathing road is carried out the air throttle of open and close controlling, the bypass chamber that falls in setting from the major axis heart direction along air-breathing road faces the bypass opening of the end of air throttle to air-breathing road inner opening, form the float chamber of fixing level of fuel in inside by the float chamber main body of the below recess of carburetor main body and subtend configuration therewith, it is characterized in that: be close to the long shaft axis A-A that electric heater 13 is set abreast with the major axis heart direction Y-Y and the level of fuel X-X on air-breathing road.

And the present invention's the 2nd being characterised in that on the basis of above-mentioned the 1st feature: above-mentioned electric heater and float chamber main body form as one, and the major axis heart direction Y-Y that is installed in air-breathing road is close in the heater fitting seat that forms abreast;

The space portion that heat is isolated usefulness is set between the sidewall of the front end of above-mentioned heater fitting seat and float chamber main body.

According to the 1st feature of the present invention, dispose the sidepiece of the big heating area of having of electric heater abreast with air-breathing road and level of fuel, so can heat the generation that can suppress to freeze effectively to bypass chamber and bypass opening.

Particularly dispose sidepiece abreast, be not easy thus the fuel of float chamber is heated, suppress the fuel vaporization in the float chamber with level of fuel.

And, according to the 2nd feature of the present invention, between the sidewall of the front end of electric heater and float chamber main body, form space portion, and the front end that can not make electric heater heats to the sidepiece of float chamber main body, so can further suppress the fuel vaporization in the float chamber.

As mentioned above, the icing heater of using that prevents according to Carburetor of the present invention, because be close to the long shaft axis that disposes electric heater abreast with major axis heart direction, the level of fuel on air-breathing road, so can heat effectively to the bypass chamber that comprises bypass opening by the sidepiece of the big heating area of having of electric heater, can prevent from thus to freeze.

And only the front end with electric heater disposes facing to the fuel that is stored in the float chamber, and the sidepiece of electric heater with big heating area is facing to fuel placement, so can suppress the generation of the fuel vaporization in the float chamber effectively.

And, by the space portion that heat is isolated usefulness is set between the front end of heater fitting seat and float chamber main body, can stop the front end of electric heater and the heat of heater fitting seat to act on the interior fuel of float chamber, can further suppress the generation of the fuel vaporization in the float chamber.

Description of drawings

Fig. 1 is the icing longitdinal cross-section diagram of using an embodiment of heater that prevents of expression Carburetor of the present invention.

Fig. 2 is the icing longitdinal cross-section diagram with heater that prevents of the existing Carburetor of expression.

Symbol description: 2 air-breathing roads; 5 float chamber main bodys; The 5A sidewall; 13 electric heaters; 20 heater fitting seats; The Z space portion; The long shaft axis of A-A electric heater; The X-X level of fuel; The long shaft axis on the air-breathing road of Y-Y.

Embodiment

Below, with heater one of preventing to freeze of Carburetor of the present invention is described according to Fig. 1

Embodiment.

Use same-sign for the structure division identical, omit explanation with Fig. 2.

The 20th, with the heater fitting seat of float chamber main body 5 formation one, with the long shaft axis Y-Y and intimate this heater fitting seat 20 that forms abreast of the level of fuel X-X in the float chamber on air-breathing road 2.

And, between the sidewall 5A of the front end 20A of this heater fitting seat 20 and float chamber main body 5, form space portion Z.

And, on this heater fitting seat 20, towards front end 20A perforation heater mounting hole 21 is set from rearward end 20C, form female thread simultaneously therein.

This heater mounting hole 21 preferably is close to bypass chamber 10 as much as possible and forms.

And, be screwed into electric heater 13 from the rearward end 20C of heater mounting hole 21 towards front end 20A, be close to the sidepiece 13A that electric heater 13 is set abreast, and face the front end 13B that space portion Z disposes electric heater 13 with the long shaft axis Y-Y on air-breathing road 2, the level of fuel X-X in the float chamber 6 thus.Promptly long shaft axis Y-Y, the level of fuel X-X with air-breathing road 2 is close to the long shaft axis A-A that electric heater 13 is set abreast.

According to the above, if to electric heater 13 energisings, make inner generating heat department heating, so this heat from sidepiece 13A with big heating area to 5 heat releases of float chamber main body, because being the long shaft axis Y-Y along air-breathing road 2, disposes this sidepiece 13A this moment, so can heat to the bypass chamber 10 that comprises bypass opening 11 effectively, suppress the generation that this place freezes.

And, if in other words, dispose sidepiece 13A orthogonally with the storage direction (above-below direction) that is stored in the level of fuel in the float chamber 6, can suppress thus the fuel in the float chamber 6 are heated, therefore can suppress the interior fuel vaporization of float chamber 6 with above-mentioned big heating area.

And, by electric heater 13 being configured to the substantially horizontal of side direction, the energising of Lian Jieing also extends out towards the right side with wire harness therewith, in Fig. 2, the right side on air-breathing road 2 is connecting the sucking pipe towards motor, because thereunder there is space portion, so energising does not extend out to produce what problem to the right with wire harness.

And, between the sidewall 5A of the front end 13B of heater fitting seat 20 and float chamber main body 5, space portion Z being set, the heat that suppresses heater fitting seat 20 thus transmits to float chamber main body 5, so further suppress the fuel vaporization in the float chamber 6 effectively.

And the existence of this space portion Z can be carried out the processing at the female thread of heater mounting hole 21 easily, simultaneously because there is not a bag hole shape, so can guarantee to remove cutting swarf.

Claims

1. a Carburetor prevents to freeze and uses heater, in this Carburetor, comprise: the bypass chamber that run through carburetor main body that air-breathing road is set in the side, air-breathing road is carried out the air throttle of open and close controlling, falls in setting from major axis heart direction along air-breathing road facing to the end of air throttle to the bypass opening of air-breathing road inner opening, by carburetor main body below the float chamber main body of recess and subtend configuration therewith form the float chamber of fixing level of fuel in inside, it is characterized in that:

Be close to the long shaft axis A-A that electric heater 13 is set abreast with the major axis heart direction Y-Y and the level of fuel X-X on air-breathing road 2.

2. Carburetor as claimed in claim 1 prevents to freeze and uses heater, it is characterized in that: described electric heater and float chamber main body form as one, and be installed in the major axis heart direction Y-Y on air-breathing road 2 and be close in the heater fitting seat 20 that forms abreast, between the sidewall 5A of the front end 20A of described heater fitting seat 20 and float chamber main body 5, the space portion Z that heat is isolated usefulness is set.