JPS63111273A - Icing preventive device for carburetor - Google Patents

Abstract

PURPOSE:To prevent a carburetor from its icing simplifying constitution, by forming a warm water passage in a heat insulating plate, provided interposing between an intake manifold and the carburetor, and heating the carburetor by warm water, which passes through said warm water passage, so that the necessity for providing piping in exclusive use for the warm water is eliminated. CONSTITUTION:A carburetor 3 is mounted to an upper surface flange 2a of an intake air inflow chamber 2 in an intake manifold 1 through a gasket 4 and a heat insulating plate 5. Here the heat insulating plate 5 provides an inflow hole 6 of warm water and its outflow hole 7 to be drilled further the inflow hole 6 to be opened to the bottom part of a warm water reservoir 8, provided in the upper surface, while the outflow hole 7 to be opened to the upper surface of the heat insulating plate 5 brought into contact with the warm water reservoir 8. While the heat insulating plate 5 forms in its bottom surface a lateral groove 9 of dull inverted V shape, and this lateral groove 9 communicates with the bottom end of the outflow hole 7 and a discharge hole 10 provided in the upper surface flange 2a. Further the carburetor 3 provides in its bottom surface a pair of heat receiving recessed parts 13, 14. In this way, the carburetor 3 is heated by the warm water (engine cooling water) which passes through a passage in the heat insulating plate 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an anti-icing device in a carburetor of an engine.

C. Prior Art) When an engine is operated in cold weather, a so-called icing phenomenon occurs in which the intake passage of the carburetor freezes. In order to prevent this, it has been known to dispose a seven-lunge between the carburetor and the intake manifold to allow part of the engine cooling water to flow, as proposed in Japanese Utility Model Publication No. 53-42664.

(Problems to be Solved by the Invention) The above-mentioned prior art tends to complicate the piping around the carburetor because of the provision of the icing joint on the outer surface of the seven lunges.

Preparatory measures to solve problem C) The present invention utilizes a heat insulating plate interposed between the intake manifold and the carburetor, forms a hot water passage therein, eliminates piping, and provides sufficient space for the carburetor. The method is to install a carburetor on the upper surface of the intake manifold collecting chamber via a heat insulating plate, and to provide a hot water passage in contact with the carburetor to allow engine cooling water to flow through it. In the icing prevention device for a vaporizer, a hot water reservoir is provided on the top surface of a heat insulating plate adjacent to the primary side intake passage of the heat insulating rice, and an inflow is communicated from the bottom surface of the heat insulating plate into the space formed by the hot water pool and the bottom surface of the vaporizer. A hole and an outflow hole are provided separately, the inflow hole is communicated with the hot water chamber of the intake manifold, and the outflow hole is communicated with the cooling water flow path via a horizontal groove on the lower surface of the heat insulating plate and a discharge path in the wall of the intake manifold. It is characterized by

(Function) With the above configuration, the hot water diverted from the intake air heater enters the hot water reservoir from the inflow hole of the heat insulating plate, contacts the lower surface of the primary passage side of the vaporizer, and heats it, causing an icing phenomenon in the vaporizer. prevent

After heat exchange, the hot water returns to the cooling water passage from the outflow hole, through the horizontal groove on the lower surface of the heat insulating plate, and through the nine discharge passages installed on the wall of the intake manifold.

(Actual mVA) Hereinafter, embodiments of the present invention will be described with reference to the drawings. In Fig. 1, (1) is the intake manifold), (2+ is its intake inflow chamber, (2a) is the 7 lunge on the top surface of the chamber (2),
A vaporizer (3) is installed on the 7-lunge via a gasket (4) and a heat insulating plate (5).

The insulation board (5) has a pair of hot water inflow holes (6) in the board thickness direction.
and an outflow hole (7) are drilled, the inflow hole (6) opens at the bottom of the hot water reservoir (8) provided on the top surface, and the outflow hole (7) opens at the bottom of the hot water reservoir (8) provided on the top surface of the insulation board. It is open to Heat insulation board (
5) is provided with a horizontal groove (9) in the shape of a square shown in FIG. Discharge hole f provided
11, and the inflow hole (6) is bypassed.

On the bottom of the carburetor (3), there is a slow boat adjustment screw (Il).
A pair of heat receiving recesses cl'a (141) are provided adjacent to the + and - downstream intake passages +121, and a barrier (older) is formed between the two recesses along the lower side of the adjustment screw Uυ.

With the above configuration, the intake manifold +11 and the inflow hole (
The hot water passing through the heat receiving recess 131.H causes turbulence in the space formed by the hot water reservoir (8) and the heat receiving recess (1:1 Replace the tf by heating the wall of the -next side intake passage fi3.
Prevent icing from forming in the f passage.

To explain the above configuration in more detail, as shown in FIG. 2, the intake manifold fi+ is connected to the cylinder pull through the intake inlet chamber (equipped with a branch pipe group 2 and gasket Q1) 1r. The intake chamber (2) is the negative side intake port (c)
, Secondary intake port C49, Hot water outlet -, Hot water discharge hole〇〇,
Equipped with 4 screw holes for fixing (1st hole for IQI)
[Attach the joint as shown in J.

As shown in Figures 2 and 3, the heat insulating plate (5) has a primary side intake passage ■, a secondary side intake passage θ°C, a warm water reservoir (8), an inflow hole f61.1f+, and a water outlet (7). , A series of banking fields with the same outline as the ditch are installed in the surrounding area, and fixing holes (341) are provided at the four corners.

A horizontal groove (9) is cut into the lower surface of the heat insulating plate (51) as shown by the dotted line, and when installed in the gasket (4), the horizontal groove (9) has the same shape as the slit field shown in Figure 2. As a result, the inflow hole (6), the fixing hole (In) and the outflow hole (7) communicate with the hot water discharge hole (101) of the intake manifold.

The carburetor (3) has a lower surface shape as shown in FIG. 4, and has a downstream intake passage 021 and a downstream intake passage e7)'e, each having a throttle valve (to) C3! It is equipped with l. - For the next intake passage Gz, be sure to install a pair of heat-receiving recesses a'taIl) below both sides of the slow boat adjustment screw Uυ as described above.
f: A barrier 09 is provided in between to create a turbulent flow of hot water, and a support wall of an appropriate thickness is formed on the bottom surface of the adjustment screw (111).Fixed to the four corners of the vaporizer (3) Drill a hole 6υ (4υ...).

Attach the carburetor (2), heat insulating plate (5), and gasket (4) to the 7 langes (2a) on the top surface of the intake manifold 111 with bolts f.
4Z +42..., and as shown in Figure 5, attach the bypass hose (4E9. - Mobulp T47) ft. The thermopulp is suspended in the intake manifold by a hanger (48).

With the above configuration, the hot water that flows out from the hot water chamber for heating the intake air of the air manifold (1) and comes out of the hot water outlet is as follows:
It enters the inlet hole (6) of the heat insulating plate (5), enters the hot water reservoir (8), makes sufficient contact with the heat receiving recess (13) (141), and the surface of the partition wall (1) to exchange heat, and then enters the vaporizer (3). Since the area around the intake passage (1z) near the next Tsukuda throttle valve ■ is heated, the icing phenomenon in which ice gradually accumulates in the passageway (1z) can be completely avoided during cold periods. .

The hot water passes through the heat receiving recess (131f14) and flows through the outflow hole (
7) fI: The hot water enters the groove (9) into the cooling water passage from the joint (1α, joint) and the hot water is When the temperature rises above a predetermined temperature, the flow is cut off.Since this thermopulp (47) is suspended from the bottom surface of the intake manifold (1), it operates accurately without being affected by the heat of the manifold (1). .

(Effects of the Invention) As described above, the present invention heats the carburetor with hot water (engine cooling water) passing through the passage provided inside the heat insulating plate, and provides hot water to the top surface of the intake manifold and the side surface of the carburetor. Since no piping is required, the configuration is simplified and various parts around the carburetor can be easily installed.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, with FIG. 1 being a longitudinal sectional view and FIG.
3 is a plan view of the heat insulating plate, FIG. 4 is a bottom view of the carburetor, and FIG. 5 is a slope view of the hot water discharge system. (5)...Insulation plate (6)...Inflow hole (
7)... Outflow hole (8)... Warm water reservoir (9
)...Horizontal groove 01...Discharge channel Patent applicant Honda Motor Co., Ltd. 2 [Procedural amendments]

Claims (1)

[Claims] In a carburetor icing prevention device in which the carburetor is attached to the upper surface of the intake manifold gathering chamber via a heat insulating plate, and a hot water passage is provided in contact with the carburetor wall to circulate engine cooling water, the primary side of the heat insulating plate is A hot water reservoir is provided on the upper surface of the heat insulating plate adjacent to the intake passage, and an inlet hole and an outlet hole communicating from the lower surface of the heat insulating plate are separately provided in the space formed by the hot water reservoir and the lower surface of the vaporizer, and the inlet hole is connected to the intake passage. An icing prevention device for a carburetor, characterized in that the outflow hole is connected to a hot water chamber of a manifold, and the outflow hole is connected to a cooling water flow path via a horizontal groove on the lower surface of a heat insulating plate and a discharge path in a wall of the intake manifold.