JPS63134826A - Valve for intake passage of engine - Google Patents

Abstract

PURPOSE:To improve heating efficiency for preventing freezing by providing a heating member on a valve disc of a valve for intake passage. CONSTITUTION:A heating member 13 made of positive temperature characteristic resistance element is buried in the surface of the circumferential part of a valve disc 12 for opening/closing an intake passage 11. A control switch 16 is turned on or off according to the rotary angle of the valve disc 12, and only when the opening degree of a valve for intake passage 10 is small, the control switch 16 is turned on, and electric current is applied to electric wires 15 and 17. Accordingly, in the state where the opening degree of the valve 10 is small and air flow flows in a narrow opening of the circumferential end part of the valve at a high speed and freezing is easily generated, the heating member 13 generates heat and heats the circumferential part of the valve disc 12 which is most easily forced. As above-mentioned, freezing can be prevented by directly heating the valve disc 12, and heating is efficient. Simplification and miniaturization of the heating member 13 is accordingly attempted, and precise temperature control can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a valve installed in an intake passage, that is, a carburetor, and a fuel mixing passage in an engine such as an automobile, and particularly relates to anti-icing technology therefor.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, in order to prevent valves such as carburetors from freezing, an electric heater or an engine cooling water passage has been provided around the valves to heat them from the outside.

This mechanism is complicated and large in size, and since it indirectly retains heat, temperature adjustment tends to be inaccurate, making it difficult to completely prevent engine stoppage.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such inconveniences and to realize a valve having a built-in heating mechanism that is simple, compact, and capable of accurate operation.

Means for solving the problem, that is, the present invention is an engine intake passage valve that is provided with a heat generating member that generates heat by energizing the valve body, and prevents freezing by this heat generation.

Function: In this valve, the heat-generating member is provided on the valve body where icing is most likely to occur, so that heating is direct, efficiency is high, and the valve can be simplified and miniaturized.

EXAMPLES Below, examples illustrating the present invention will be specifically described.

FIG. 1 shows an engine intake passage valve 10, in which a disc-shaped valve body 12 is attached to a pipe-shaped intake passage 11 of a carburetor, and this valve body 12 is rotated to open and close the intake passage 11. .

A heat generating member 13 made of a positive temperature characteristic resistance element (PTC element) is embedded in the plane of the peripheral portion of the valve body 12, and an electric wire 15 extends from one end of the rotating shaft 14 and a control switch 16 extends from the other end. When electricity is applied between the electric wire 17 and the electric wire 17, heat is generated. This control switch 16 is connected to the rotating shaft 14
The reed plate 20 contacts the contact plate 19 at the peripheral end of the rotary plate 18 attached to the rotary plate 18, and turns on and off according to the rotation angle of the valve body 12, and turns on only when the opening degree of the valve 10 is small. It is set to be.

Therefore, when this valve 1o is used with a power supply connected to the electric wire 15.17, the opening degree of the valve is small and the airflow flows at high speed through the narrow gap at the peripheral end of the valve body 12, which is likely to cause icing. , the control switch 16 is turned on, and the heat generating member 13
generates heat and heats the area around the valve body 12 that is most likely to freeze.

FIG. 3 shows a valve body 20 of another intake passage valve. This valve body 2
0 is used in the same manner as the valve body 12 described above, and a heat generating member 21 made of a hot wire such as a nichrome wire is embedded in the peripheral end, and this heat generating member 21 is an electric wire drawn out along the rotating shaft 22. 23. When a current is passed through 24, it generates heat. Note that this example does not have a control switch.

Therefore, in a valve using this valve body 20, heating is always performed by electricity supply, and freezing is prevented.

In all of the above examples, the heat-generating member is provided around the valve body where icing is likely to occur, but icing can be prevented effectively even if the heat-generating member is installed in the center of the valve body other than the surrounding area. I can do it. Further, the valve body itself may be formed of a heat generating element such as a barium titanate alloy, and the entire valve body may be used as a heat generating member. Note that when attaching the heat generating member to the valve body, it is convenient to make the valve body of an insulating material such as synthetic resin to simplify the structure.

As the heat generating member, any one such as a positive temperature characteristic resistance element, a heating wire, etc. can be used. Using a positive temperature characteristic resistance element is convenient because its characteristics allow the air to be heated to a constant temperature regardless of the flow rate.

When using a hot wire, it is desirable to use a temperature control device that adjusts the amount of heat generated depending on the air temperature, etc.

Although the control switch shown in the intake passage valve 10 is effective for keeping heating to a minimum level, it is not essential to the present invention and should be installed as appropriate depending on the usage situation.

Effects of the Invention As described above, the present invention provides a heat-generating member on the valve element of the intake passage valve of the Vζ engine, and directly heats the valve element to prevent icing. Therefore, heating is efficient and a small-sized It is only necessary to use a heat generating member, the structure is simple, and the external dimensions do not increase. Furthermore, when used in conjunction with a temperature control device, accurate temperature control is achieved because heating is direct.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway eaves view showing an embodiment of the present invention;
Figure 2 (Fig. 3g is a perspective view showing the valve body on the same side; Figure 3g is a perspective view showing the valve body of another embodiment. 10... Engine intake path valve; 12...
... Valve body, 13 ... Heat generating member, 16.
... Control switch, 20 ... Valve body,
21...--heat generating member.

Claims (1)

[Scope of Claims] 1. A valve for an engine intake passage, which is provided with a heat-generating member that generates heat by energizing the valve body, and prevents freezing by the heat generated. 2. The engine intake passage valve according to claim 1, wherein a heat generating member is provided around the valve body. 3. Claim 1 in which the entire valve body is formed of a heat-generating member
Valve for the intake passage of the engine described in Section 2. 4. The engine intake passage valve according to claim 1, 2, or 3, which has a control switch that energizes the heat generating member only when the opening degree of the valve is small. 5. An intake passage valve for an engine according to claim 1, 2, 3, or 4, in which a positive temperature characteristic resistance element is used as the heat generating member.