JPS6323568Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water heating device for a carburetor of an internal combustion engine, and more particularly to a device for heating a carburetor with hot water such as engine cooling water.

In an internal combustion engine, the temperature directly below the throttle valve of the carburetor is 10°C higher than the outside temperature due to the heat of vaporization of gasoline.
When the temperature drops by 20°C below the dew point, water droplets form.
These water droplets adhere to the vicinity of the throttle valve and slow port and freeze quickly under conditions such as an outside temperature of 0°C to 5°C and a humidity of 90% to 100%. If water droplets adhering to the throttle valve or slow port freeze during part-load or light-load operation, the actual throttle valve opening area decreases and intake air is regulated, resulting in a richer air-fuel ratio, which causes problems when the throttle valve is returned to its original position. This may cause the engine to stall, or cause the engine to run unsmoothly, such as a lack of power due to smoldering of the spark plug while driving.

In order to eliminate such freezing, some methods have been adopted to heat the carburetor flange with warm water such as engine cooling water to melt the ice or prevent ice formation.
Conventional methods for this include circulating hot water from the carburetor to the intake manifold and providing two pipes, one for inlet and one for outlet, on the carburetor flange.

However, the former method involves inserting an engine cooling water intake pipe 2 into the carburetor flange 1, as shown in FIG. A hot water circulation channel is formed that reaches the cooling water discharge pipe 6 through the carburetor flange 1 and the intake manifold 4. However, since the carburetor flange 1 and the intake manifold 4 are assembled with a gasket 7 interposed between them, it is necessary to The cooling water may leak and enter the intake cylinder, and the latter method has the disadvantage that processing equipment is complicated and costs are high.

The present invention was made to solve the problems of the conventional vaporizer hot water heating device as described above, and its purpose is to have a simple structure,
To provide a hot water heating device for a carburetor of an internal combustion engine that requires low processing equipment costs for a flange of the carburetor and is free from water leakage during maintenance work of the carburetor.

In order to achieve this objective, the present invention provides a first and second
a first tube having openings, and a second tube having third and fourth openings, the third opening of the second tube being connected to the second opening of the first tube. It has a double pipe part disposed close to the opening and in which a part of the first pipe is covered by the second pipe and a hot water passage is formed between the second pipe and the first pipe, and the first opening of the first pipe and the fourth opening of the second pipe constitute a water passage branched from the double pipe part, and the flange part of the carburetor is provided with the water passage. An insertion hole is provided for inserting the double pipe portion of the water pipe, and the water pipe is inserted into the flange portion of the vaporizer, and the first opening of the first pipe and the fourth opening of the second pipe are provided.
The hot water is supplied from one of the openings, and the hot water is discharged from the other opening, thereby circulating the hot water.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 shows a first embodiment of the present invention, in which a blind hole 9 is provided near a slow port 8 in a carburetor flange 1 into which one end of a hot water passage pipe 10 for engine cooling water or the like is press-fitted.

The hot water pipe 10 has a lower half of an inner pipe 12 having a hot water inlet 11 at one end, and a hot water supply port 1 at one end.
3 into the outer tube 14 to form a double tube,
An annular water passage 1 is formed between the inner pipe 12 and the outer pipe 14.
5, and the other end of another water pipe 17 having a hot water outlet 16 at one end is connected to the outer pipe 14 in a direction perpendicular to the outer pipe 14, so that a hot water inlet 11, a hot water supply port 13, and a hot water outlet 16 are connected to the outer pipe 14. It shall be an integrated water pipe with three ports. Note that 18 is a flange provided on the outer periphery of the inner tube 12 to close the other end of the outer tube 14. When the hot water pipe 10 having the above structure is attached to the vaporizer flange 1, the double pipe portion is embedded in the press-fitting blind hole 9 of the flange 1.

In the apparatus of this embodiment having the above configuration, the hot water inlet 11 and the hot water outlet 16 are respectively connected to a hot water supply source (not shown) such as engine cooling water by appropriate means.
When the hot water is brought into communication with the vaporizer flange 1, the hot water pumped by a pump or the like passes through the inlet 11, the inner wall 12, and the hot water supply port 13, and reaches the blind hole 9 of the vaporizer flange 1, heating the vaporizer flange 1 at a specific temperature. The upper surface of the throttle valve 19 and the inner wall of the slow port 8 on the throttle valve 19 side are thawed or prevented from forming ice. The hot water that has heated the vaporizer flange 1 is reversed at the bottom of the blind hole 9, passes through the annular water passage 15 between the inner pipe 12 and the outer pipe 14, enters the water pipe 17, and passes through its outlet 16 to the hot water supply source. return. In this way, the carburetor flange 1 can be heated by circulating hot water such as engine cooling water. Note that the hot water circulation can also be performed in the opposite direction, in which case the hot water is passed through the water pipe 1.
7. The water reaches the inner pipe 12 via the outer pipe 14 and returns to the hot water supply source through the inlet 11.

As is clear from this example, the three ports 11, 1
The water pipe 10 having the pipes 3 and 16 is integrally constructed, and only the hot water supply port 13 of the three ports is connected to the vaporizer flange 1, so the structure on the vaporizer flange side is simple and the piping is simple. Become. Furthermore, there is no risk of hot water leaking into the intake cylinder during maintenance work involving assembly, removal, etc. of the carburetor.

FIG. 3 shows the configuration of a hot water pipe according to a second embodiment of the present invention.
0, the other end of another water pipe 45 having a hot water outlet 44 at one end is inserted at right angles from the outside into a water pipe 43 having a hot water inlet 41 and a hot water supply port 42 at both ends thereof, and the inserted portion 46 The water passage pipe 43 is bent at right angles along the axial direction and this portion is formed to have a small diameter to constitute a double pipe wall, and an annular water passage 47 is formed in this double pipe wall portion. The hot water that has entered the water pipe 43 passes through the annular water passage 47 and reaches the hot water supply port 42, turns around, enters the small-diameter insertion portion 46, passes through the water pipe 45, and exits from the hot water outlet 44.

It should be noted that, like the first embodiment, the second embodiment has a heating effect and a simple structure for the carburetor flange, and is also effective in eliminating water leakage during maintenance of the carburetor. be.

Since the present invention has the above-mentioned structure and function, the structure is simple, and since it is sufficient to attach one pipe to the carburetor flange, the processing equipment cost for the flange is low. This prevents high product costs, and since the hot water circulation path is limited to the inside of the carburetor flange, there is no water leakage even when removing the carburetor for maintenance, and there is no risk of water entering the intake cylinder. This has the effect of providing a hot water heating device that does not require a vaporizer.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a conventional hot water heating device for a vaporizer, Fig. 2 is a partially cutaway plan view of the first embodiment of the present invention, and Fig. 3 is a horizontal cross-sectional view of a hot water pipe in the second embodiment of the invention. FIG. 1... Carburetor flange, 9... Blind hole for press-fitting, 1
0,40...Hot water pipe, 11,41...Hot water inlet, 12...Inner pipe, 13,42...Hot water supply port,
14... Outer pipe, 15, 47... Annular water passage, 1
6,44...Hot water outlet, 17,45...Water pipe,
43... Water pipe.

Claims (1)

[Scope of utility model registration request] A first tube having first and second openings, and a second tube having third and fourth openings, the third opening of the second tube being connected to the first tube. disposed proximate the second opening of the tube;
It has a double pipe part in which a part of the first pipe is covered by a pipe and a hot water passage is formed between the second pipe and the first pipe, and the first opening of the first pipe and the Second
A fourth opening of the pipe constitutes a water pipe disposed branching from the double pipe part, and an insertion hole for inserting the double pipe part of the water pipe is provided in the flange part of the vaporizer, Inserting the water pipe into the flange of the vaporizer, supplying hot water from one of the first opening of the first pipe and the fourth opening of the second pipe, and supplying hot water from the other opening. A hot water heating device for a vaporizer of an internal combustion engine, characterized in that hot water is discharged and hot water is circulated.